A tyre (1) for vehicle wheels comprises a tread band (2) on which a first main groove (10) and a second main groove (20) are defined, as well as at least one secondary groove (30; 40) which extends between the first main groove (10) and the second main groove (20). The secondary groove (30; 40) comprises a central region (33; 43), having a depth less than a depth of the first main groove (10) and the second main groove (20), and a first end region (34; 44) which extends between the central region (33; 43) and the first main groove (10), having an increasing depth from the central region (33; 43) towards the first end (31; 41).
A pneumatic tyre (1) for vehicle wheels comprises a tread band (2) on which a first main groove (10) and a second main groove (20) are defined, as well as a first secondary groove (30) and a second secondary groove (40) which extend between the first main groove (10) and the second main groove (20) and having respectively a first depth (P1) and a second depth (P2), different from each other. A sipe (33) is formed in the bottom (34) of the first secondary groove (30).
The present invention relates to a novel sustainable polyester obtained by the copolymerization of at least one diol, preferably at least two diols, at least one dicarboxylic acid, preferably at least two dicarboxylic acids, more preferably three dicarboxylic acids, and optionally at least one hydroxycarboxylic acid or cyclic lactones thereof, as defined in the description, to a vulcanizable elastomeric composition comprising such a novel sustainable polyester, and to a tire for vehicle wheels and a structural component thereof manufactured with such a vulcanizable elastomeric composition.
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
B60C 11/00 - Tyre tread bandsTread patternsAnti-skid inserts
C08G 63/47 - Polyesters chemically modified by esterification by unsaturated monocarboxylic acids or unsaturated monohydric alcohols or reactive derivatives thereof
C08G 63/50 - Polyesters chemically modified by esterification by monohydric alcohols
C08G 63/685 - Polyesters containing atoms other than carbon, hydrogen, and oxygen containing nitrogen
C08G 63/688 - Polyesters containing atoms other than carbon, hydrogen, and oxygen containing sulfur
The present invention relates to a vulcanizable elastomeric composition comprising a diene elastomeric polymer, a reinforcing filler, at least one vulcanizing agent, and an amorphous polyester obtained by the copolymerization of at least one diol, preferably at least two diols, at least one dicarboxylic acid, preferably at least two dicarboxylic acids, more preferably three dicarboxylic acids, and optionally at least one hydroxycarboxylic acid or cyclic lactones thereof, as defined in the description, and to a tire for vehicle wheels or a green structural component thereof comprising such a vulcanizable elastomeric composition.
A moulded and vulcanised tyre (5) comprises a radially internal surface (6), having an application area (A) on which a plurality of gas escape routes are created, and a functional insert (1) having an adhesive surface (4a) and an exposed surface (4b) facing away from the adhesive surface (4a). The adhesive surface (4a) is adhered to the radially internal surface (6) of the tyre at the application area (A). The plurality of gas escape routes is configured to evacuate a gas interposed between the adhesive surface (4a) of the functional insert (1) and the radially internal surface (6) of the tyre (5) so as to maximise the contact between the adhesive surface of the functional insert and the radially internal surface of the tyre.
A pressing bladder (103) for a vulcanisation mould (100) has a radially external surface (105) configured to adhere to a radially internal surface of a green tyre (5a) during a moulding and vulcanisation step of the green tyre to obtain a moulded and vulcanised tyre (5). The radially external surface (105) comprises reliefs (107) having the shape of ribs (110) or columns (111) and bridges (112).
A tyre (1 ) for motorcycle wheels is described comprising an equatorial plane (X- X) free from transversal grooves and a tread band (8) extending according to an axial development (L), wherein the tread band (8) comprises, in a plan development thereof, two lateral annular portions (L2, L3) arranged on opposite sides with respect to said equatorial plane (X-X) and each comprising a first lateral annular sub-portion (L2', L3'), proximal with respect to the equatorial plane (X-X), and a second lateral annular sub-portion (L2", L3"), distal with respect to the equatorial plane (X-X). In the tread band (10), a plurality of transversal grooves (12) is defined, which are formed in the lateral annular portions (L2, L3), each having an axial extension equal to at least 30% of the axial half-development (L/2) of the tread band (10) and a first directrix (g') forming with the equatorial plane (X-X) an angle (alpha) having a minimum value (alpha'a) comprised between 15° and 50° at an end (12'a) proximal to the equatorial plane (X-X). The transversal grooves (12) form a circumferential succession of transversal ribs (13) extending up to the axial ends of the tread band (10) and having a first portion (13') having an increasing width moving away from the equatorial plane (X-X) in a first annular sector (S) proximal to the equatorial plane (X-X).
An off-road motorcycle tyre comprises a tread band having a central annular portion extending astride of an equatorial plane (X-X) of the tyre (1) and comprising: - a plurality of circumferentially consecutive central blocks (15) arranged astride of the equatorial plane (X-X) and having a first width (LI) in the axial direction; - a plurality of circumferentially consecutive first lateral blocks (20) arranged next to the central blocks (15) and having a second width (L2) in the axial direction; - a plurality of circumferentially consecutive second lateral blocks (60) arranged next to the central blocks (15) on the opposite side with respect to said plurality of first lateral blocks (20) and having said second width (L2) in the axial direction; wherein the ratio between said second width (L2) and said first width (LI) is comprised between 0.65 and 1.3.
An off-road motorcycle tyre comprises a tread band having a maximum chord (C). The tread band comprises a central annular portion (M) extending astride of an equatorial plane (X-X) of the tyre (1) and comprising a plurality of circumferentially consecutive first central blocks (15) arranged next to the equatorial plane (X-X) and a plurality of circumferentially consecutive second central blocks (50) arranged next to the equatorial plane (X-X) on the opposite side with respect to the first central blocks (15), each second central block (50) being axially adjacent to a respective first central block (15). An intermediate annular portion (5) without blocks is arranged astride of the equatorial plane (X-X) and extends between the first central blocks (15) and the second central blocks (50). Each first central block (15) and the respective second central block (50) are arranged at a respective minimum mutual distance in the axial direction such that the ratio between said minimum mutual distance and said predetermined maximum chord (C) is greater than, or equal to, 0.15.
Method, and system (99), of interacting with a monitoring device (1) fixed to an inner surface (2) of a tyre (3) mounted on a rim, the system (99) comprising a source (90) configured for providing, upon request, an identification code of the monitoring device (1) univocally associated with the monitoring device (1), wherein the source (90) comprises at least one physical means (91) firmly applied to the tyre (3), and an interrogation device (92) configured to obtain the identification code of the monitoring device (1) from the source (90) by at least one respective interaction with the physical means (91), and for performing at least one interaction with the monitoring device (1) based on the identification code of the monitoring device (1) obtained.
Method and apparats are provided for detecting an aquaplane condition of a tire (805) during the rolling of the tire on a rolling surface (515; 1205), wherein said tire comprises a tread band in which at least one circumferential groove (303-1 - 303-4; 1603-1 - 1603-4) is formed which is provided with at least one wear bar (305-1, 305-2; 1605-1, 1605-8), the method comprising: applying radially internally to the tire a tire monitoring device (810), the tire monitoring device comprising an electronic unit (900) comprising a sensor (930) configured for detecting physical quantities indicative of deformations experienced by the tire in the rolling on the rolling surface and for outputting measurements of said physical quantities, monitoring said measurements of said physical quantities during the rolling of the tire on the rolling surface and determining a passage of said monitoring device in correspondence of a contact zone (510) of the tire with said rolling surface.
B60C 23/00 - Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehiclesArrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanksTyre cooling arrangements
B60T 8/172 - Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
Method of manufacturing a tyre sensing device (1), comprising: providing a mould (20) comprising a protruding element (30) protruding from the moulding surface (26), providing an assembly (2) comprising an electronic unit (3) comprising a sensor (4), a processing unit and a receiver-transmitter, and an electrical power supplier (5) connected to the electronic unit, placing the assembly in the moulding cavity with the sensor in contact with the protruding element, filling the moulding cavity with a precursor material of a polymeric material, hardening the precursor material to make an encapsulating body (9) in polymeric material, wherein the encapsulating body embeds the assembly, keeping the protruding element and the sensor (4) pressed against each other, wherein the precursor material also flows around the protruding element and extracting from the moulding cavity the sensing device comprising the encapsulating body and the assembly, separating the protruding element from the sensor (4) to obtain a through opening (14) in the encapsulating body.
B29D 30/00 - Producing pneumatic or solid tyres or parts thereof
B29C 39/10 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
B29C 45/14 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
B60C 23/04 - Signalling devices actuated by tyre pressure mounted on the wheel or tyre
13.
PROCESS AND APPARATUS FOR ASSOCIATING FUNCTIONAL INSERTS WITH TYRES FOR VEHICLE WHEELS
The invention is related to a process and apparatus for associating functional inserts to tyres for vehicle wheels. The apparatus includes a transfer unit (16) carrying a handling device (17) comprising a grip member (20), a contrast member (21), and at least one thrust actuator (29) operating between said grip member (20) and contrast member (21). While the functional insert (7) is retained at an exposed surface (7b) thereof by the grip member (20), the grip member (20) and the contrast member (21) are pushed towards each other by the thrust actuator (29), to press the functional insert (7) and the radially inner surface (6) of the tyre (2) against each other with mutually equal and opposite forces that mutually balance out each other without transmitting stress to the transfer unit (16).
The invention is related to a process and a plant for fixing a functional insert to a tyre. The plant (10) comprises an application station (15), a loading station (11), a first handling device (27) that is configured for performing an application sequence on the functional insert (1) and a second handling device (28) that is configured for performing a consolidation sequence on the functional insert (1).
A process and apparatus for constraining a functional insert (100) to a tyre (200) for vehicle wheels provide for positioning the functional insert (100) so that its central axis (B) is perpendicular to a radially inner surface (201) of said tyre (200), arranging a presser (3) and applying, by means of said presser (3), a first localised pressure on a first portion (P1) of the exposed surface (102b), located at the internal zone (101a) of the functional insert (100), and a second localised pressure on a second portion (P2) of the exposed surface (102b) of the functional insert (100), translating, during the application of the second pressure, at least part of the presser (3) transversally away from the central axis (B) and through the peripheral zone (101b) of the exposed surface (102b).
A functional insert (7) is applied to a tyre (2) such to fix an attachment surface (7a) of the insert by an attachment interface (G) interposed between the functional insert (7) and the tyre (2). The application provides for preforming the functional insert (7) in order to confer to the attachment surface (7a) a shaping that is substantially convex with the central zone (A) axially projecting with respect to the peripheral zone (B) along the central geometric axis (K). The central zone (A) is pressed against the radially inner surface (6) of the tyre (2), maintaining the peripheral zone (B) of the functional insert (7) spaced from the radially inner surface (6) by a retention action exerted along the peripheral zone (B). Subsequently, the peripheral zone (B) is pressed against the radially inner surface (6).
The present invention relates to a tyre for vehicle wheels which comprises at least one structural element comprising a vulcanised elastomeric compound obtained by vulcanisation of an elastomeric composition comprising per 100 phr of diene elastomeric polymer: (i) a predispersion of (a) a first diene elastomeric polymer, (b) a copolymer of vinylpyridine with a conjugated diolefin and/or a monovinylarene, and (c) lignin, said predispersion being in an amount to provide the elastomeric composition with at least 5 phr of said first diene elastomeric polymer and at least 5 phr of lignin, (ii) 0 to 95 phr of a second diene elastomeric polymer, (iii) at least 5 phr of a reinforcing filler, (iv) optionally, a reinforcing resin comprising at least 1 phr of a methylene acceptor compound associated with at least 1 phr of a methylene donor compound, and (v) 0.1 to 12 phr of at least one vulcanising agent.
UNIVERSITA' DEGLI STUDI DI MILANO - BICOCCA (Italy)
Inventor
Giannini, Luca
Tadiello, Luciano
Guerra, Silvia
Papagni, Antonio
Monti, Mauro
De Luca, Davide Maria
Abstract
The present invention relates to compositions for elastomeric compounds for high- performance tyres, such as motorsport tyres, comprising specific reversible cross- linking modifying agents, tyre components and vehicle wheel tyres comprising them. The present elastomeric compounds, by virtue of their particular hysteretic behaviour, allow the manufacture of tyres characterised by high roadholding and handling in all driving conditions.
C08L 19/00 - Compositions of rubbers not provided for in groups
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
19.
METHOD FOR EQUIPPING A TYRE WITH A DEVICE FOR MONITORING AT LEAST ONE PARAMETER CHARACTERISTICS OF AN INTERACTION BETWEEN THE TYRE AND A TYRE ROLLING SURFACE, AND TYRE EQUIPPED WITH A MONITORING DEVICE
A method is provided for equipping a tyre (1205) with a tyre monitoring device (1210). The tyre (1205) comprises a tread band (1220) in which at least one circumferential groove (1603-1 – 1603-4) is formed, provided with at least one wear bar (1605-1, 1605-2). The method comprises applying the tyre monitoring device (1210) radially internally (1215) to the tyre (1205), in a position, opposed to said tread band (1220), which is immediately preceding the at least one wear bar (1605-2) in a sense of rotation (1610) of the tyre (1205). A corresponding tyre equipped with a monitoring device is also provided.
B60C 23/00 - Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehiclesArrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanksTyre cooling arrangements
20.
METHOD AND SYSTEM FOR ESTIMATING THE STATE OF A ROAD SURFACE
Method and system for estimating the state of a road surface (40) wherein it is provided to associate a monitoring unit (2) to a tyre (11) of a vehicle, said monitoring unit (2) comprising at least one detecting element (3) adapted to measure a quantity descriptive of a deformation of the tyre (11); fitting said tyre (11) to a wheel (20) of said vehicle and operating said vehicle so as to cause rotation of said tyre (11) on a road segment having said road surface (40) wherein, due to said fitting and operating, said tyre (11) is deformed in a deformation zone (46, 42, 47, 44). For each revolution of the tyre (11), it is also provided for: obtaining a signal representative of said quantity measured during the rotation of the tyre (11); frequency filtering said signal in a first frequency band so as to obtain a first filtered signal and in a second frequency band, different from said first frequency band, so as to obtain a second filtered signal; processing the first filtered signal so as to obtain a value of a first parameter indicative of the variability of said first filtered signal in said first frequency band, said processing being carried out at a portion of the first filtered signal that corresponds to a rolling step of the tyre (11) wherein said monitoring unit (2) is located in said deformation zone (46, 20 42, 47, 44) of the tyre (11); processing the second filtered signal so as to obtain a value of a second parameter indicative of the variability of said second filtered signal in said second frequency band, said processing being carried out at a portion of the second filtered signal that corresponds to a rolling step of the tyre (11) wherein said monitoring unit (2) is in said deformation zone (46, 42, 47, 44) of the tyre (11).
Method for manufacturing a tyre sensing device (1), comprising: - providing a mould (20) comprising in the moulding cavity (25) at least two spacers (31), distinct and separate; - providing an assembly (2) comprising: - an electronic unit (3) comprising a sensor (4), a processing unit and a receiver-transmitter; and - an electric power supplier (5) electrically connected to the electronic unit (3); - placing said assembly into the moulding cavity; - filling the moulding cavity with a precursor material that also flows at the spacers (31); - hardening the precursor material to make an encapsulating body (9) of polymeric material, in one piece and incorporating in contact the assembly, where the coupling surface (11) of the encapsulating body (9) lies on a reference plane (22) forming part of the moulding surface, wherein at least three surface points of the assembly are kept in contact with, or in proximity to, corresponding surface points on the free ends of the spacers (31) positioned with a predetermined spatial relationship to the reference plane (22) of the moulding surface, and wherein the three surface points of the assembly are positioned with a predetermined spatial relationship to the development plane (32) of the assembly to satisfy a predetermined parallelism requirement between the development plane (32) and the coupling surface (11) of the encapsulating body; and - extracting from the moulding cavity (25) the sensing device (1).
A tyre for motor vehicles comprises a carcass ply (3), a belt structure (11) and a reinforcement structure (16) with zero-degree reinforcement cords (17). The belt structure (11) is formed by a first belt strip (12) and a second belt strip (13) mutually and axially adjacent or partially superimposed at or in proximity to a middle line plane (M) of the tyre (1). The first belt strip (12) and the second belt strip (13) have belt cords (14, 15) which delimit with the circumferential direction (C) of the tyre (1) angles (α, β) of between 25° and 40° and an angle (y) of between 50° and 80° between them. Each reinforcement cord (17) has a "tensile load - elongation" curve comprising a first section (T1), placed upstream of a predefined percentage elongation (Sp), a second section (T2), placed downstream of the predefined percentage elongation (Sp). A second slope of the second section (T2) is greater than a first slope of the first section (T1).
B60C 9/20 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
B60C 9/22 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
B60C 9/04 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
A Tyre (1) suitable to be mounted on a first wheel (W1) of a vehicle (C) with a determined camber angle (α), comprising: - a tread band (2), in a radially outer position, comprising a first and a second lateral axial portion (21, 22), said tread band (2) forming a footprint area (20) which, due to said camber angle (α), is asymmetrical and comprises, a first footprint length (L1) at said first lateral axial portion (21) and a second footprint length (L2) at said second lateral axial portion (22) such that said first footprint length (L1) is greater than said second footprint length (L2), said tread band (2) comprising a first circumferential groove (3) placed at said first lateral axial portion (21) and at a distance (d) from said equatorial plane (M) of said tyre (1) between 5% and 15% of a width of said tread band (2); - a monitoring device (10) constrained to a radial internal surface (L) of said tyre (1), wherein said monitoring device (10) is radially positioned at said first circumferential groove (3).
A car tyre (100), in particular a so-called "summer" tyre is described. The tread band (20) of the tyre comprises a central region (L1) separated from two shoulder regions, respectively a first shoulder region (L2) and a second shoulder region (L3). The first (L2) and second (L3) shoulder regions are provided with large grooves evenly distributed along the circumferential development of the tyre. Said first (L2) and second (L3) shoulder regions are respectively separated from the central region (L1) by two circumferential grooves, in particular a first circumferential groove (1) and a second circumferential groove (2). Furthermore, the central region (L1) of the tyre has been designed so as to form three circumferential ribs (5, 6, 7) defined by a third (3) and a fourth (4) circumferential groove located in said central region (L1). The first (L2) and second (L3) circumferential grooves, as well as the third (3) and the fourth (4) circumferential grooves have substantially the same width. The central region (L1) has a low void-to-rubber ratio, and further comprises transverse grooves (10, 11, 12) extending in a respective circumferential rib (5, 6, 7). Such transverse grooves (10, 11, 12) are narrower than the large grooves in the two shoulder regions and are all arranged with their inclination angle increasing moving away from the first shoulder region (L2).
A tyre (105) monitoring device (200) configured to be applied to a radially internal surface (115) of the tyre (105) to be monitored, the monitoring device comprising: a container (215, 220) including an upper casing portion (220) having walls which internally delimit a hollow space (325), the upper casing portion (220) having an opening (230) suitable for putting the hollow space (325) in communication with the environment external to the monitoring device (200); an electronic unit (205) housed in the container (220) and including at least a pressure sensor (330) having a sensitive surface exposed to the hollow space (325), the pressure sensor being configured to detect a pressure in the hollow space (325), and a sealing element (235) associated with the opening (230), the sealing element (235) being permeable to gaseous fluids to allow communication of gaseous fluids between the environment external to the monitoring device (200) and the hollow space (325) inside the container (220), and impervious to non-gaseous bodies to prevent penetration, from the environment external to the monitoring device (200) into the hollow space (325), of non-gaseous bodies.
A monitoring device (200) of a tyre (105) is configured to be applied to an internal surface (115) of the tyre (105) to be monitored and includes: a container (215, 220), an electronic unit (205), housed in said container (215, 220), which includes a printed circuit board assembly comprising a printed circuit board (320) on which electrical and/or electronic components of the electronic unit (205) are mounted. The printed circuit board (320) has a face (835) on which electrical contact pads (805) are provided, perimetral to respective mounting areas (705), provided on said face (835), for mounting said electrical and/or electronic components. At least one of the electrical and/or electronic components mounted on the printed circuit board (320) is packaged in a package (605) having, at a respective lower face (830), perimetral electrical contact pads (610), arranged along perimetral sides of the package, connected through solder joints respectively to the contact pads (805) of the printed circuit board (320) perimetral to the mounting area (705) of the at least one electrical and/or electronic component provided on the face (835) of the printed circuit board. The perimetral electrical contact pads (610) of the package and said solder joints are covered by a filler material (905). A method of manufacturing a tyre monitoring device (200) is also described.
B60C 23/04 - Signalling devices actuated by tyre pressure mounted on the wheel or tyre
H01L 23/24 - Fillings characterised by the material, its physical or chemical properties, or its arrangement within the complete device solid or gel, at the normal operating temperature of the device
Method and system (99) for adjusting an anti-skid control system (100) of a vehicle (1 ) moving on a surface (R), the system comprising an actuation device (9) operatively connected to wheels (W) of the vehicle (1 ) and a processing unit (8) programmed to perform the following steps of the method: - in response to a request (RS) of speed variation of the vehicle (1 ), applying over time a respective torque (Tr) to one or more wheels (W); - for a tyre (T1 ) mounted on a respective wheel (W1 ) having a respective current value (Ac) of the first parameter less than or equal to a predetermined target value (Atg), performing a routine of estimation of an operational value (Aop) of the first parameter for which a maximum friction (lie) is obtained between the tyre (T1 ) and the surface comprising: i) estimating a respective current value (Uc) of a second parameter (U) representative of a friction between the tyre (T1 ) and the surface (R); ii) estimating the operational value (Aop) of the first parameter as a function of the respective current value (Ac) of the first parameter and of the respective current value (Uc) of the second parameter; - on condition that the respective torque (Tr) is still applied, adjusting the anti-skid control system (100) by updating the predetermined target value (Atg) of the first parameter with a new target value (AtgN) of the first parameter as a function of the operational value (Aop) of the first parameter.
B60T 8/1761 - Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
B60T 8/1763 - Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to the coefficient of friction between the wheels and the ground surface
B60W 40/12 - Estimation or calculation of driving parameters for road vehicle drive control systems not related to the control of a particular sub-unit related to parameters of the vehicle itself
B60T 8/172 - Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
28.
ELASTOMERIC COMPOSITIONS AND COMPOUNDS COMPRISING A NEW SECONDARY CROSS-LINKING SYSTEM AND TYRES COMPRISING THEM
The present invention relates to elastomeric compositions and compounds for tyres, comprising a novel secondary cross-linking system comprising at least one methylene donor agent of formula (I) wherein R1 is ethyl and at least one phenolic resin as a methylene acceptor agent, and vehicle wheel tyres comprising them. The new secondary cross-linking system of the invention allows imparting the materials optimal stiffness, thermal stability, breaking strength and adhesion to the reinforcement elements, improving the cross-linking kinetics and the processability of the compound, while at the same time reducing or maintaining the hysteresis. These materials which include this cross-linking system, which is more harmless than conventional ones because it is free of resorcinol, formaldehyde and similar substances, are advantageously used in those tyre components that require a certain rigidity and resistance to breakage and/or high adhesion to textile or metal reinforcement elements together with a low rolling resistance.
The present invention relates to elastomeric compositions and compounds for tyres, comprising a novel secondary cross-linking system comprising at least one methylene donor agent of formula (I) and at least one methylene acceptor agent, and tyres for vehicle wheels comprising them. The new secondary cross-linking system of the invention allows imparting the materials optimal stiffness, breaking strength and adhesion to the reinforcement elements, improving the cross-linking kinetics and the processability of the compound, while at the same time reducing or maintaining the hysteresis. These materials are advantageously used in those tyre components that require a certain rigidity and resistance to breakage and/or high adhesion to textile or metal reinforcement elements together with a low rolling resistance.
A process for transferring an annular component (C) used in building tyres comprises arranging a preparation drum (2) extended around a rotation axis (X), winding a semi-finished product according to a substantially annular or cylindrical shape around said preparation drum (2) so as to manufacture an annular component (C) of a tyre, removing the preparation drum (2) from the annular component (C) by axially moving said preparation drum (2) and supporting the annular component (C) by a support device (3) concurrently with said removal.
Method and system (99) for detecting an interaction condition (IC) of a tyre (3) with a surface (900), wherein the system (99) comprises a monitoring device (4) fixed to an inner surface (5) of the tyre (3) at a crown portion (6) and configured to acquire a radial acceleration signal (AS) from the crown portion (6), and a processing unit (8) in communication with the monitoring device (4) and programmed to receive from the monitoring device (4) the radial acceleration signal (AS) and to perform the following steps of the method: calculating an adjustment factor Af according to the formula Af = ASavg + w2R*, where ASavg is an average value of the radial acceleration signal (AS), w is the angular velocity of the tyre, and R* is a parameter representative of a radius of the tyre (3); obtaining an adjusted radial acceleration signal (ASa) by a difference between the radial acceleration signal (AS) and the adjustment factor (Af); detecting the interaction condition (IC) as a function of the adjusted radial acceleration signal (ASa).
Method and system (99) for detecting an aquaplaning condition (IC) of a tyre (3) with a surface (900), wherein the system (99) comprises a monitoring device (4) fixed to an inner surface (5) of the tyre (3) at a crown portion (6) and configured to acquire a radial acceleration signal (AS) from the crown portion (6), and a processing unit (8) in communication with the monitoring device (4) and programmed to receive from the monitoring device (4) the radial acceleration signal (AS) and to perform the following steps of the method: obtaining an adjustment factor (Af) representative of an offset between one or more acquired values of radial acceleration and respective current values; obtaining an adjusted radial acceleration signal (ASa) by a difference between the radial acceleration signal (AS) and the adjustment factor (Af); identifying, in the adjusted radial acceleration signal (ASa), a sub-portion (ASaP) of the signal corresponding to a passage of the crown portion (6) internally to a footprint portion of the tyre (3); calculating a comparison parameter (RV) as a function of an average value (mASa) of the signal (ASa) in the sub-portion (ASaP); detecting the aquaplane condition (IC) as a function of a comparison between the comparison parameter (RV) and at least one threshold value.
The present invention relates to a self-sealing tyre for vehicle wheels comprising at least one carcass ply, a tread band applied in a radially external position with respect to said carcass ply in a crown portion, at least one liner applied in a radially internal position with respect to said carcass ply, a sealing assembly applied in a radially internal position with respect to said liner and axially extending at least at a part of the crown portion; wherein said sealing assembly comprises a permanent multilayer self-supporting film comprising at least two outer layers of polyamide and at least one inner layer of polyolefin, wherein said multilayer self-supporting film has a residual relaxation strength of between 1 MPa and 20 MPa, preferably between 5 MPa and 15 MPa, and a layer of sealing material associated with and supported by said permanent multilayer self-supporting film; wherein said permanent multilayer self-supporting film is radially internal to the layer of sealing material and said layer of sealing material is placed substantially in contact with said liner.
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
B60C 5/14 - Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
B60C 19/00 - Tyre parts or constructions not otherwise provided for
A motorcycle tyre comprises a tread band having a central annular portion (A) extending astride of an equatorial plane (X-X) of the tyre and two lateral annular portions arranged on opposite sides with respect to the central annular portion (A). The central annular portion (A) comprises a plurality of circumferential grooves (20; 60) each having an intermediate portion (21; 61) and two end portions (22, 23; 62, 63) arranged on opposite sides with respect to the intermediate portion (21; 61) along a circumferential direction. The intermediate portion (21; 61) has a width (W1a) less than the maximum width (W1b, W1c) of each of the two end portions (22, 23; 62, 63).
A motorcycle tyre comprises a tread band (8) having a plurality of main grooves (20; 60) arranged on opposite sides with respect to an equatorial plane (X-X) of the tyre and a void to solid ratio greater than 10%. Each of said main grooves (20; 60) comprises a first rectilinear portion (21; 61) inclined with respect to the equatorial plane (X-X) by a first angle (α) less than 45° and having an end (21a; 61a) proximal to the equatorial plane (X-X) and an end (21b; 61b) distal from the equatorial plane (X-X). Each of said main grooves (20; 60) further comprises a second rectilinear portion (22; 62) inclined with respect to said first rectilinear portion (21; 61) by a second angle (β) comprised between 90° and 160° and having an end (22a; 62a) proximal to the equatorial plane (X-X) and an end (22b; 62b) distal from the equatorial plane (X-X). Said second rectilinear portion (22; 62) is shorter than said first rectilinear portion (21; 61).
In the manufacturing of a tyre for vehicles, one or more stratified annular components are obtained, by arranging, around a central geometric axis (X), a radially outer annular layer (7a) with toroidal shape having a concavity directed towards the central geometric axis (X). Against the radially outer annular layer (7a), a radially inner annular layer (7b) with toroidal shape is then applied, having a convexity directed away from the central geometric axis (X). Before applying the radially inner annular layer (7b), axially opposite end flaps (26) of the radially outer layer (7a) are mutually moved apart.
Method for producing a vulcanization mold for a tyre for vehicle wheels comprising a plurality of sectors wherein each sector comprises a molding surface of a tread band portion of the tyre, said method comprising for each sector: - making by means of a digitally controlled apparatus (110) at least one surface portion of said molding surface with a surface roughness starting from a digital model wherein said surface roughness is defined through a predetermined algorithm.
Tyre (2) for vehicle wheels comprising a tread band (9) with a tread surface comprising at least one surface portion with a surface roughness wherein: said surface portion with said surface roughness has a power spectral density described by a curve that represents the power spectral density as a function of the wave number, the power spectral density in m4and the wave number in m-1 being expressed in logarithmic units in base 10; said curve comprises an intermediate region that extends for a predetermined range of wave numbers from an initial wave number value up to a final wave number value, said range of wave numbers in said curve being equal to 0.20 and said initial wave number value being comprised in said curve between 3.6 and 4.5; said curve comprises two points that represent the power spectral density value at the initial wave number value and at the final wave number value, wherein a straight line that joins the two points has a negative angular coefficient that in absolute value is greater than or equal to 6.
The present invention relates to a vulcanization mold for a tyre (2) for vehicle wheels and a method for producing such a mold. The mold comprises a molding surface of tread band (9) of the tyre (2), at least one surface portion of said molding surface of tread band having a surface roughness, wherein: - said surface portion with said surface roughness has a power spectral density described by a curve that represents the power spectral density as a function of the wave number, the power spectral density in m4 and the wave number in nr 1 being expressed in logarithmic units in base 10; - said curve comprises an intermediate region that extends for a predetermined range of wave numbers from an initial wave number value up to a final wave number value, said range of wave numbers in said curve being equal to 0.20 and said initial wave number value being comprised in said curve between 3.6 and 4.5; - said curve comprises two points that represent the power spectral density value at the initial wave number value and at the final wave number value, wherein a straight line that joins the two points has a negative angular coefficient that in absolute value is greater than or equal to 6.
A tyre (1) comprising, in a radially outer position, a tread band (2) on which a tread surface (3) is defined. The aforementioned tread band (2) includes a plurality of grooves (7A, 7B), each comprising a first wall (71) and a second wall (72) facing each other and defining a groove width (WG). At least one of the first wall (71) and the second wall (72) includes a plurality of protrusions (8) projecting from at least one of the first wall (71) and the second wall (72) with a protrusion width (WP), wherein the protrusion width (WP) is less than 20% of the groove width (WG).
A tyre (1) for motorcycle wheels is described comprising an equatorial plane (XX) and a tread band (8) extending according to an axial development (L), wherein the tread band (8) comprises, in a plan development thereof, a central annular portion (L1) arranged astride of the equatorial plane (X-X) of the tyre (1) and two lateral annular portions (L2, L3) arranged on opposite sides of the central annular portion (L1) with respect to the equatorial plane (X-X) of the tyre (1). The tread band (8) also comprises at least one longitudinal groove (20) formed in the central annular portion (L1) and a plurality of transversal grooves (33) substantially parallel to one another, formed in the lateral annular portions (L2, L3) of the tread band (8). The transversal grooves (33) obliquely extend with respect to the equatorial plane (X-X) of the tyre (1) according to an angle of inclination comprised between 40° and 75° with respect to the equatorial plane (X-X) and form therebetween a circumferential succession of transversal ribs (34) which extend up to the axial ends of the tread band. An axially inner end (33a) of the transversal grooves (33) is arranged at a predetermined distance (d) from the longitudinal groove (20) so as to form a circumferential solid portion (35) of tread band (8), axially arranged between the axially inner end (33a) of the transversal grooves (33) and the longitudinal groove (20), and integrally formed with the transversal ribs (34).
A tyre (1) for vehicle wheels comprises a tread band (2) which extends between a first axial end (4a) and a second axial end. There are defined on the tread band a plurality of first grooves (10) which are arranged in succession along a first shoulder region (7), a plurality of second grooves (20) which are arranged in succession along a second shoulder region (8), and a plurality of third grooves (30). Each third groove extends from a respective first end (31) which is defined between an equatorial plane (X) and a first axial end (4a) of the tread band as far as a respective second end (32) which is defined between the equatorial plane (X) and a second axial end (4b) of the tread band. Furthermore, each third groove is inclined at an angle (A) between 8° and 30° with respect to a circumferential direction defined on the tread band (2).
A tyre for motor vehicles comprises a carcass structure (2) comprising a first carcass ply (3) and a second carcass ply (4), a reinforcing layer (8) comprising at least one reinforcing cord (9) wound in a plurality of circumferential coils and arranged in a radially outer position to the carcass structure (2) and in contact with the carcass structure (2), a tread band (10) applied in a radially outer position to the reinforcing layer (8) and in contact with the reinforcing layer (8). The first carcass ply (3) has a first end flap (3A) engaged with a first annular anchoring structure (5A) and a second end flap (3B) spaced from a second annular anchoring structure (5B). The second carcass ply (4) has a first end flap (4A) engaged with the second annular anchoring structure (5B) and a second end flap (4B) spaced from the first annular anchoring structure (5A). The first carcass ply (3) and the second carcass ply (4) are superimposed on each other in an overlapping area located below the tread band (10).
B60C 9/10 - Carcasses the reinforcing cords within each carcass ply arranged in a crossing relationship
B60C 9/18 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
B60C 9/22 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
B29D 30/30 - Applying the layersGuiding or stretching the layers during application
44.
TYRE FOR MOTOR VEHICLES AND PROCESS FOR BUILDING A TYRE FOR MOTOR VEHICLES
A tyre for motor vehicles comprises a carcass structure (2) comprising a first carcass ply (3) and a second carcass ply (4), a reinforcing layer (8) comprising at least one reinforcing cord (9) wound in a plurality of circumferential coils and arranged in a radially outer position to the carcass structure (2) and in contact with the carcass structure (2), a tread band (10) applied in a radially outer position to the reinforcing layer (8) and in contact with the reinforcing layer (8). The first carcass ply (3) has a first end flap (3A) engaged with a first annular anchoring structure (5A) and a second end flap (3B) spaced from a second annular anchoring structure (5B). The second carcass ply (4) has a first end flap (4A) engaged with the second annular anchoring structure (5B) and a second end flap (4B) spaced from the first annular anchoring structure (5A). The first carcass ply (3) and the second carcass ply (4) are superimposed on each other in an overlapping area located below the tread band (10).
B60C 9/18 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
B60C 9/22 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
45.
TYRE FOR MOTOR VEHICLES AND PROCESS FOR BUILDING A TYRE FOR MOTOR VEHICLES
A tyre for motor vehicles comprises a carcass structure (2) comprising a first carcass ply (3) and a second carcass ply (4), a reinforcing layer (8) comprising at least one reinforcing cord (9) wound in a plurality of circumferential coils and arranged in a radially outer position to the carcass structure (2) and in contact with the carcass structure (2), a tread band (10) applied in a radially outer position to the reinforcing layer (8) and in contact with the reinforcing layer (8). The first carcass ply (3) has a first end flap (3A) engaged with a first annular anchoring structure (5A) and a second end flap (3B) spaced from a second annular anchoring structure (5B). The second carcass ply (4) has a first end flap (4A) engaged with the second annular anchoring structure (5B) and a second end flap (4B) spaced from the first annular anchoring structure (5A). The first carcass ply (3) and the second carcass ply (4) are superimposed on each other in an overlapping area located below the tread band (10).
B60C 9/22 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
B29D 30/30 - Applying the layersGuiding or stretching the layers during application
46.
PROCESS FOR MAKING A REINFORCING CORD FOR TYRES FOR VEHICLE WHEELS
A process for making a reinforcing cord for tyres for vehicle wheels comprises providing at least one semi-finished product (15) comprising at least one sacrificial elongated element (20) and at least two elongated elements (11a, 11b) made of non-metallic material, wherein said at least one first elongated element (11a) of said at least two elongated elements (11a, 11b) and said at least one sacrificial elongated element (20) extend along a helical path with a predetermined helix pitch (E), and removing the at least one sacrificial elongated element (20) from the at least one semi-finished product (15). A reinforcing cord (10) is thus obtained having an empty space (10a) previously occupied by the at least one sacrificial elongated element (20) and wherein said at least one first elongated element (11a) extends together with said empty space (10a) along said helical path with said predetermined helix pitch (E).
During the making of tyres for vehicles, one or more multilayer annular components (7) are formed, each comprising annular layers (7a, 7b) radially superimposed on each other. One or more of the annular layers (7a, 7b) are made through respective forming cycles, each comprising: a) winding a semifinished product (S) according to a substantially cylindrical conformation around a building drum (13) comprising two half-drums (15) mutually aligned along a rotation axis (X); b) mutually moving away said half-drums along the rotation axis (X) by partially extracting them from the semifinished product, in order to generate or enlarge an annular opening (16) between the mutually moved-apart half-drums; c) radially expanding, through the annular opening (16), a profiler drum (17) coaxial with the building drum (13) in order to shape the semifinished product (S) according to an arched axial profile in conformity with an expansion surface (19) presented in radially outer position by the profiler drum.
A method for building a multilayer component (7) for building a tyre (2) is implemented in a station (11), wherein a radially outer layer (7a) is arranged and subjected to a shaping to form a multilayer component being processed. Subsequently, a radially inner layer (7b) is arranged and subjected to a shaping executed within the multilayer component being processed until it is incorporated thereto. In the station (11), a building drum (13) has a building surface (14) and a profiler drum (17) comprises a profiler body (18) having a shaping surface (19). The shaping surface (19) has a convex axial profile corresponding to the axial profile of the multilayer component (7). The building surface (14) is openable and closable at an axial middle line zone (M) in order to generate an annular opening (16) adapted to allow the radial passage at least of the profiler body (18).
A reinforcing cord (10) for tyres for vehicle wheels, comprising at least two elongated elements (11a, 11b) made of non-metallic material, wherein at least one elongated element (11a) extends along a helical path around an empty space (10a) with a predetermined helix pitch (E). This reinforcing cord (10) is obtained from a semi-finished product made by winding said at least one elongated element (11a) around at least one sacrificial elongated element with the predetermined helix pitch (E) and, subsequently, removing the at least one sacrificial elongated element from the semi-finished product, thus creating the aforesaid empty space (10a).
A reinforcing cord (10) for tyres for vehicle wheels, comprising at least two elongated elements (11a, lib) made of non-metallic material and twisted together, the reinforcing cord (10) extending along a non- rectilinear longitudinal trajectory, in particular an undulating longitudinal trajectory.
A reinforcing cord (10) for tyres for vehicle wheels, comprising at least one first elongated element (11a) made of a first non-metallic material and extending along a helical path with a predetermined helix pitch (E) around at least one second elongated element (11b) made of a second non-metallic material different from said first material and arranged in a radially inner position with respect to said at least one first elongated element (11a). The second material is a low modulus material.
A Tyre (1 includes a tread band (2) on which a plurality of blocks (8) are defined, extending transversely from a first zone (N 1) to a second zone (N2), at least one sipe (10) having a siping width (W). The sipe (10) separates the block (8) into a first portion (11) comprising a first surface (13), as well as a second portion (12) comprising a second surface (14). In a third zone (N3) located between the first zone (Nl) and the second zone (N2), at least one of the first surface (13) and the second surface (14) moves away from a respective reference plane (X, X') up to the tread surface (3), creating at least one chamfer (30). The chamfer (30) has, in correspondence with the tread surface (3), a chamfer width (Wl) of a size greater than the siping width (W).
A tyre (1) comprising a tread band (2) with a plurality of three- dimensional sipes (10) defined on each block (8). Each sipe (10) separates the block (8) into a first and a second portion (11, 12) respectively comprising a first and a second surface (13, 14) extended at least partially along a first and a second reference plane (X, X') incident to the tread surface (3). Between said first and second portion (11, 12), a plurality of couplings is provided, comprising: • - at least one protrusion (15) formed on the first surface (13) and extended from the first reference plane (X) towards the second portion (12) of the block (8) up to a portion of maximum protrusion lying on a third reference plane (Y), • - at least one recess (16) formed on the second surface (14) and extended from the second reference plane (X') away from the first portion of the block (11) up to a portion of maximum recess lying on a fourth reference plane (Y'), where the third and fourth reference planes (Y, Y') are spaced by a first distance (L1) from the first and second reference planes (X, X').
Method and system for estimating (99) the interaction between a tyre (3) mounted on a first wheel (W1) of a vehicle (1), equipped with a command and control unit (15), and a road surface, wherein the system comprises an actuation device (9) connected to the first wheel (W1), and a processing unit (8) programmed and configured for, in response to a detection request signal (RS) of the interaction between tyre (3) and road surface generated by the command and control unit, performing the following steps of the control method: - applying a torque (Tr) to the first wheel (W1) and maintaining the second wheel (W2) in free rolling onto said road surface; - estimating a current value of a first parameter (Uc) representative of a friction between the tyre (3) and the road surface and a current value of a second parameter (Ac) representative of a slip of the tyre (3) with respect to the road surface; - estimating an available friction coefficient (Ue) between the tyre (3) and the road surface as a function of the first (Uc) and second parameter (Ac), wherein applying the torque (Tr) is performed as a function of a mounting position (P) of the first wheel (W1) on the vehicle (1) so that, as a consequence of the applying the torque (Tr), an axle of the vehicle (1) to which belongs the first wheel (W1) is more unloaded with respect to remaining axles of the vehicle due to a redistribution of a total mass of the vehicle (1).
Method and system for estimating (99) the interaction between a tyre (3) mounted on a first wheel (W1) of a vehicle (1), equipped with a command and control unit (15), and a road surface, wherein the system comprising an actuation device (9) connected to said first wheel (W1) and to a second wheel (W2) of the vehicle distinct from the first wheel (W1), and a processing unit (8) programmed and configured for, in response to a detection request signal (RS) of the interaction between tyre (3) and road surface generated by the command and control unit, performing the following steps of the control method: - applying a torque (Tr) to the first wheel (W1) and maintaining the second wheel (W2) in free rolling onto said road surface; - estimating a current value of a first parameter (Uc) representative of a friction between the tyre (3) and the road surface and a current value of a second parameter (Ac) representative of a slip of the tyre (3) with respect to the road surface; - estimating an available friction coefficient (Ue) between the tyre (3) and the road surface as a function of the first (Uc) and second parameter (Ac), - receiving as input in real time a value representative of a rate of the torque (Tr1), and commanding the actuation device (9) for applying the torque (Tr) as a function of a comparison between the value representative of the rate of the torque (Tr1) and a respective limit value (Tr'ref).
Method and system for estimating (99) the interaction between a tyre (3) mounted on a first wheel (W1) of a vehicle (1), equipped with a command and control unit (15), and a road surface, wherein the system comprises an actuation device (9) connected to said first wheel (W1) and to a second wheel (W2) of the vehicle distinct from the first wheel (W1), and a processing unit (8) programmed and configured for, in response to a detection request signal (RS) of the interaction between tyre (3) and road surface generated by the command and control unit, performing the following steps of the control method: - applying a torque (Tr) to the first wheel (W1) and maintaining the second wheel (W2) in free rolling onto said road surface; - estimating a current value of a first parameter (Uc) representative of a friction between the tyre (3) and the road surface and a current value of a second parameter (Ac) representative of a slip of the tyre (3) with respect to the road surface; - estimating an available friction coefficient (Ue) between the tyre (3) and the road surface as a function of the first (Uc) and second parameter (Ac), wherein the current value of the second parameter (Ac) is estimated as a function of a speed (Vx1) of the first wheel (W1) and of a speed (Vx2) of the second wheel (W2).
The present invention relates to a tyre, for winter, all-seasons or summer applications, characterized by a reduced wear and improved grip. Said tyre comprises a tyre component comprising a cross-linked elastomeric compound obtained from a cross-linkable elastomeric composition comprising a particular conjugated diene polymer (I).
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
C08C 19/22 - Incorporating nitrogen atoms into the molecule
C08C 19/24 - Incorporating phosphorus atoms into the molecule
C08F 236/10 - Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl aromatic monomers
58.
TYRE FOR VEHICLE WHEEL WITH SUPERIOR WEAR RESISTANCE AND GRIP
The present invention relates to a tyre, for winter, all-seasons or summer applications, characterized by a reduced wear and improved grip. Said tyre comprises a tyre component comprising a cross-linked elastomeric compound obtained from a cross-linkable elastomeric composition comprising a particular conjugated diene polymer (I).
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
C08C 19/22 - Incorporating nitrogen atoms into the molecule
C08C 19/24 - Incorporating phosphorus atoms into the molecule
C08F 236/10 - Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl aromatic monomers
The present invention relates to a tyre (100) for bicycle wheels comprising: - a carcass structure (2) comprising at least one carcass ply (3) having ends (3a) turned up around respective bead cores (4a, 4b) to form respective opposite beads (5a, 5b), - a tread band (7) arranged in a radially outside position with respect to said carcass structure (2), and - a layer of vulcanised elastomeric material (8) superimposed, in a radially inside or outside position, to the carcass structure (2), or interposed in the carcass structure (2), said layer of vulcanised elastomeric material (8) axially extending from at least one bead (5a) to the opposite bead (5b), characterised in that said layer of vulcanised elastomeric material (8) is made by vulcanisation of a vulcanisable elastomeric compound comprising micrometre-sized fibrillated polymer fibres.
B60C 9/06 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend diagonally from bead to bead and run in opposite directions in each successive carcass ply, i.e. bias angle ply
B60C 9/12 - Carcasses built-up with rubberised layers of discrete fibres or filaments
B60C 9/18 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
B60C 15/00 - Tyre beads, e.g. ply turn-up or overlap
B60C 15/06 - Flipper strips, fillers, or chafing strips
60.
PROCESS AND APPARATUS FOR BUILDING TYRES FOR BICYLCLES
In building a tyre (2) for bicycles, the deposition of at least one of said components is preceded by a cutting-to-size processing of a respective semifinished product (20a, 20b, 20c, 20d), which is made to advance with a lower surface (SI) thereof in abutment against an advancing plane (P) defined by a conveyor belt (23) comprising a feed section (24) and a preparation section (25) that are consecutively aligned. The advancement of the semifinished product is stopped when a head end (A) thereof reaches a predetermined cutting distance (K) with respect to a cutting plane (Q). A cutting section (T) of the semifinished product is lifted respective to the advancing plane (P) at the cutting plane (Q), and the semifinished product is cut transverse along a cutting line (L) in order to separate a piece (21) of predetermined length. The piece (21) advances along the conveyor belt (23) in order to position and stop the head end (A) on the deposition surface (15) of a building drum (13) that rotates while the conveyor belt (23) moves the piece (21) at an advancing speed correlated to a peripheral speed of the deposition surface (15), in order to circumferentially deposit the piece (21).
An apparatus for vulcanising and moulding tyres comprises an annular container (16) engaging or configured to engage a plurality of circumferential sectors (10). The annular container (16) is movable between a raised position, in which the circumferential sectors (10) are circumferentially spaced from each other, and a lowered position, in which the annular container (16) surrounds the circumferential sectors (10) and the circumferential sectors (10) are circumferentially moved close to each other. A conduit (26) for circulating a heating medium is provided in the annular container (16). The conduit (26) surrounds the circumferential sectors (10) and has a wavy pattern that stretches towards the bottom (18) and towards the top (17) in a wavy pattern.
An apparatus for building green tyres (100) for bicycles comprises a building drum (2) rotating around a primary rotation axis (A) and at least one feed line (3) configured for dispensing at least one semifinished product (108) comprising an insert (106) towards a pointing section (2b) of said building drum (2). The feed line (3) comprises an applicator device (4) situated in radially outer position with respect to the building drum (2) in order to feed the semifinished product (108) along an advancement direction (B) and apply the insert (106) on a carcass structure (102) arranged on the building drum (2). The applicator device (4) comprises a guide body (5) and an applicator member (6), where an outlet section (5a) of the guide body (5) is situated, with reference to the advancement direction (B), in proximity to an application portion (6a) of the applicator member (6). The guide body (5) is configured for maintaining the semifinished product (108) in an alignment condition along the advancement direction (B) opposing slip forces transverse to the advancement direction (B) acting on the semifinished product (108) and the applicator member (6) is configured for receiving the semifinished product (108) correctly aligned from the guide body (5) and for pressing the insert (106) on the carcass structure (102) along a radially inner direction.
An apparatus for building green tyres (100) for bicycles comprises a building drum (2) rotating around a primary rotation axis (A) placed at a predetermined first height (Q1), a feeding group (4) for feeding at least one carcass ply (103) towards the building drum (2) located above a top portion (3) of the building drum (2) and a first feeding line (5) configured for feeding a first insert (106) towards a first pointing section (2f) of the building drum (2), in which the first pointing section (2f) is situated at height lower than or equal to said predetermined first height (Q1).
An apparatus for building green tyres (1) for bicycles comprises a building drum (20), at least one feeding line (103) configured for feeding a first semifinished product (A1, An), a cutting device (104) operative along the feeding line (103) and configured for cutting to size a piece (C) of the first semifinished product (A1- An). The feeding line (103) comprises a motorised application conveyor belt (105) configured for thrustingly feeding the piece (C) so as to move it towards the building drum (20) up to a respective first pointing zone (106). At least one dispensing line (112) is configured for dispensing a second semifinished product (B1-Bm) directly towards the building drum (20) up to a second pointing zone (113). A grip ring (118) is configured for axially removing a built green tyre (1) from the building drum (20).
In building a tyre (2) for bicycles, the deposition of at least one of said components is preceded by a cutting-to-size processing of a semifinished product (20a, 20b, 20c, 20d), which is made to advance with a lower surface (SI) thereof in abutment against an advancing plane (P) defined by a conveyor belt (23) comprising a feed section (24) and a preparation section (25) that are consecutively aligned. The advancement of the semifinished product is stopped when a head end (A) thereof reaches a predetermined cutting distance (K) with respect to a cutting plane (Q). A cutting section (T) of the semifinished product is lifted respective to the advancing plane (P) at the cutting plane (Q), and a cutting member (39, 49) translates transverse to the semifinished product in order to cut the latter along a cutting line (L). A tail end (B) of the cut piece (21) and a head end (A) of the semifinished product are repositioned on the advancing plane (P) upstream of the cutting line (L).
In building a tyre (2) for bicycles, the deposition of at least one of said components is preceded by a cutting-to-size processing of a semifinished product (20a, 20b, 20c, 20d), which advances in abutment against an advancing plane (P) defined by a conveyor belt (23) comprising a feeding section (24) and a preparation section (25) that are consecutively aligned. The advancement of the semifinished product is stopped and an abutment plate (50) interposed between the feeding section (24) and the preparation section (25) is lifted with respect to the advancing plane (P) together with a cutting section (T) of the semifinished product. A cutting member (51) translates transverse to the semifinished product in order to cut the latter along a cutting line (L). The abutment plate (50), carrying a tail end (B) and a head end (A) of the cut semifinished product, is repositioned coplanar to the advancing plane (P).
Process for building tyres for wheels of vehicles, comprising the following building operations: a) providing a first forming drum (10) rotating about its central axis (X-X); b) winding around a radially external surface (11) of said first forming drum (10) a cut-to-size semi-finished element (20), thereby forming a corresponding component (30) of a tyre being processed, wherein said semi-finished element (20) has, after having been wound around said first forming drum (10), opposite ends (21, 22) juxtaposed with each other to form a junction zone (23); c) repeating operation b) until completion of the building operations on said first forming drum (10). During said building operations, a checking operation is performed on said tyre being processed, at least at the end of an operation b). Said checking operation comprises: acquiring at least one two-dimensional image (100) of said tyre being processed; identifying, in said image (100), at least one junction zone (110) in a radially external position of said tyre being processed; providing a plurality of reference images (200), wherein each reference image (200) represents, whether alone or combined with one or more other reference images, a junction zone type; comparing said at least one identified junction zone (110) with each one of the reference images (200); selecting, as a function of said comparison, a junction zone type corresponding to said at least one junction zone (110) identified in said image (100); classifying said at least one identified junction zone (110) on the basis of the selected junction zone type; generating, as a function of said classification, either a stop signal (S1I) or a consent signal (S2). Said stop signal (SI) causes said building operations to stop. Said consent signal (S2) activates the execution of subsequent operations on said tyre being processed.
A studded tyre comprises a tread band (2), on which there are defined a plurality of blocks (5) and a plurality of studs (9) which are arranged on at least some of said blocks. On each block (5) on which a stud (9) is provided there is defined a protuberance (10) which is spaced apart from said stud and which extends continuously around said stud (9) over an angular extent greater than or equal to 270°. The protuberance (10) is delimited at its opposite sides by an internal channel (20) and by an external channel (30), which are both continuous.
A winter car tyre (100) is described, in particular a winter car tyre able to deliver high driving torque and/or to reach high speeds, provided with a tread band comprising transverse sipes (13), wide and deep pairs of first transverse grooves (2, 3) which are widely extended and alternate with pairs of second transverse grooves (4, 5) which are of non-negligible extent but are smaller wide and deep and are counter-inclined relative to the first transverse grooves (2, 3).
Method (200), and system thereof (1), for checking a process for building a tyre comprising the sequential deposition of an ordered plurality of N semi-finished elements on a drum (2), the method comprising: - predetermining (102) an ordered plurality of N classes of drum states, wherein a first class corresponds to a bare drum state and an i-th class, with i ranging from 2 to N, corresponds to a drum state including the i-1 th semi-finished element deposited in radially outermost position; -before the deposition of an i-th semi-finished element: - acquiring (103) one image of a current drum state; - processing (104) the image to associate to the current drum state a current class among the ordered plurality of N classes of drum states; - authorising the deposition of the i-th semi-finished element on the basis of a comparison (105) between the current class and the expected class, i.e. the i-th class in the ordered plurality of N classes.
Method of restoring a monitoring functionality in a tyre (99) and tyre (99) suitable for such method for restoring, the method comprising producing the vulcanized tyre (99) comprising at least a first (A1 ) and a second clean portions (A2) of an inner surface (1 ) of the tyre (99), fixing a first monitoring device (3) on the first clean portion (A1 ) and leaving the second clean portion (A2) free of monitoring devices; and, following a loss of monitoring functionality by the first monitoring device (3) fixed onto the first clean portion (A1 ), fixing a second monitoring device (4) onto the second clean portion (A2).
144 and W have the meaning as defined in the description, to be used as reinforcing filler for vulcanisable elastomeric compositions suitable for the production of tire for vehicle wheels.
A tyre for vehicle wheels, comprising a tread band (2), on which there are defined a plurality of first groups of shoulder blocks (110) which extend from a first shoulder region (4) towards a central region (6) of the tread band (2), a plurality of second groups of shoulder blocks (120) which extend from the first shoulder region (4) towards the central region (6) and which alternate with the first groups of shoulder blocks (110), and a plurality of first groups of central blocks (100) which are adjacent and axially internal with respect to a respective first group of shoulder blocks (110) and a respective second group of shoulder blocks (120). The groups of blocks (110, 120, 100) are separated from each other by at least one main groove (10, 30, 50) while the blocks (111, 112; 121, 122; 101, 102) inside each group of blocks are separated from each other by at least one secondary groove (16, 25, 35). The areas of the respective radially external surfaces of the groups of blocks differ from a mean value of the areas of these radially external surfaces by a value less than 30% of said mean value.
A tyre for vehicle wheels comprises a tread band (2), on which there are defined a plurality of first pairs of main grooves which are formed by a first main groove (10) and a second main groove (20) which extend from a first shoulder region (4) and a second shoulder region (5) towards a central region (6), a plurality of second pairs of main grooves which alternate with respect to said first pairs of main grooves (30, 40) which are formed by a third main groove (30) and a fourth main groove (40) which extend from the first shoulder region (4) and second shoulder region (5) towards the central region (6); a plurality of third pairs of main grooves (50, 60) which are formed by a fifth main groove (50) and a sixth main groove (60) which extend between two first successive main grooves (10) and between two successive second main grooves (20), and less inclined than the first and second main grooves (10, 20) but concordant with the first and second main grooves (10, 20), respectively. Each pair of first successive main grooves (10) circumferentially delimits a first group of shoulder blocks (110) and a second group of shoulder blocks (120) which are separated from each other by the third main groove (30), and a first group of central blocks (100) which are separated from the first group of shoulder blocks (110) and second group of shoulder blocks (120) by the fifth main groove (50).
The present invention relates to an improved process for the preparation of an elastomer composition comprising a linear or cyclic di-carboxylic acid, or a derivative thereof.
A beltless tyre (1) for motor vehicles comprises a carcass structure (2) with two carcass plies (3, 4), each equipped with a plurality of parallel cords (13, 14), the parallel cords (13, 14) of the two carcass plies (3, 4) are crossed together with an intersection angle (A) between 20° and 60° and delimiting with a circumferential direction (C) of the tyre (1) an angle (a, |3) included between 60° and 80°. A reinforcing cord (9) is wound in a plurality of circumferential turns arranged in radially outer position with respect to the carcass structure (2). The reinforcing cord (9) has a predefined percentage elongation (Sp) and a "tensile load - elongation" curve comprising a first section (T1), located upstream of the predefined percentage elongation Sp and provided with a first slope, and a second section (T2), located downstream of the predefined percentage elongation (Sp) and provided with a second slope. A ratio of the second slope to the first slope is greater than 1.
B60C 9/06 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend diagonally from bead to bead and run in opposite directions in each successive carcass ply, i.e. bias angle ply
B60C 9/22 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
B60C 9/00 - Reinforcements or ply arrangement of pneumatic tyres
B60C 9/20 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
A front tyre (1) for motorcycle wheels is described comprising an equatorial plane (X-X), and a tread band (8) having an overall axial extension (L) and comprising a radially inner portion (12) made with a first vulcanized elastomeric material and a radially outer portion (11) comprising: a1) a central annular portion (L1) arranged astride the equatorial plane (X-X) of the tyre (1) and made with the first vulcanized elastomeric material, and a2) a pair of lateral annular portions (L2, L3) arranged at opposite sides of the central annular portion (L1) with respect to the equatorial plane (X-X) of the tyre (1) and made with a second vulcanized elastomeric material. In the tyre (1), a ratio R1 between the dynamic elastic modulus E' of the second vulcanized elastomeric material, measured at a frequency of 10Hz and at 23 °C, and the dynamic elastic modulus E' of the first vulcanized elastomeric material, measured at a frequency of 10Hz and at 23°C, is comprised between 0.6 and 1.2. In the tyre (1), a ratio R2 between the tandelta of the second vulcanized elastomeric material, measured at a frequency of 10Hz and at 70°C, and the tandelta of the first vulcanized elastomeric material, measured at a frequency of 10Hz and at 23°C, is comprised between 0.6 and 1.2.
The present invention relates to a soundproof tyre for vehicle wheels comprising at least one noise-reducing element made by vulcanisation of a cross-linkable and expandable elastomeric compound comprising at least one diene elastomeric polymer, at least one expanding agent, at least one cross-linking resin, at least one polymer or copolymer of a hydroxy acid and optionally, an agent selected from the group of fatty acid amides.
A tyre (1) comprises a tread band (2), a tread surface (3) which is radially external to the tread band and a plurality of blocks (5) formed on the tread band. Each block (5) is at least partially delimited by a groove (4) which defines a flank (7) of the block which is joined to a tread surface portion (6) which is defined on the block in the region of an edge (8) of the block. There are defined on a portion of the edge (8) a plurality of consecutive recesses (9) and, in the region of at least two of these recesses (9), there is provided a respective block portion (10) which defines a protrusion which projects from the flank (7) of the block towards the inner side of the groove (4) and which extends as far as a bottom (4b) of the groove (4).
The present invention relates to compositions for elastomeric tyre compounds, comprising particular cross-linking functionalising agents comprising at least one tetrazole functionality and at least one carbene or nitrene precursor, characterised by precise temperatures for activating the two functionalities, tyre components and vehicle wheel tyres comprising them. Advantageously, the present cross-linking functionalising agents on the one hand allow to functionalise - in situ - the common commercial polymers under mild conditions and, on the other hand, to cross-link the compounds improving their breaking properties and reducing their hysteresis.
A tyre (100) for racing bicycle wheels comprises a carcass structure (2) and a tread band (6) arranged in a radially outer position with respect to the carcass structure (2); wherein the carcass structure (2) comprises a single carcass ply (3) turned around annular anchoring structures (4a, 4b) and wherein free edges (11) of the carcass ply (3) are radially juxtaposed over one another. A protective layer (16) has a width equal to or less than 50% of the width of the tyre (100). A first sidewall reinforcing ply (14) and a second sidewall reinforcing ply (15) are axially arranged between a respective annular anchoring structure (4a, 4b) and an equatorial plane (X) of the tyre. In a first area of juxtaposition (17), the protective layer (16), the first sidewall reinforcing ply (14) and the portion of juxtaposition (12) of edges of carcass ply are radially juxtaposed according to a predetermined order. In a second area of juxtaposition (18), the protective layer (16), the second sidewall reinforcing ply (15) and the portion of juxtaposition (12) of edges of carcass ply are radially juxtaposed according to a predetermined order. The first area of juxtaposition (17) and the second area of juxtaposition (18) are arranged at respective distances from the equatorial plane (X) comprised between 3% and 24% of the width of the tyre (100).
B60C 15/00 - Tyre beads, e.g. ply turn-up or overlap
B60C 9/09 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend transversely from bead to bead, i.e. radial ply combined with other carcass plies having cords extending diagonally from bead to bead, i.e. combined radial ply and bias angle ply
B60C 9/06 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend diagonally from bead to bead and run in opposite directions in each successive carcass ply, i.e. bias angle ply
B60C 9/18 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
A tyre (1) comprises a plurality of blocks (5, 6) which are defined on a tread band (2) and at least one first sipe (10; 20) which is formed on each block. The first sipe (10; 20) extends in a first longitudinal direction (A) and comprises a first linear portion (11) which substantially extends along the first longitudinal direction (A), a single-wave portion (12) which extends in continuation of the first linear portion (11), and a second linear portion (13) which extends in continuation of the single-wave portion (12). The single-wave portion (12) comprises a first segment (14) which is inclined and which extends from the first linear portion (11) as far as a first peak (15), a second segment (16) which is inclined and which extends from the first peak (15) as far as an opposite second peak (17) and a third segment (18) which is inclined and which extends from the second peak (17) as far as the second linear portion (13). The second segment (16) of the single-wave portion (12) is inclined with respect to the first longitudinal direction (A) at an angle greater than the first segment (14) and the third segment (18).
A tyre (1) comprises a plurality of blocks (5) which are defined on a tread band (2) and at least one first sipe (10) and one second sipe (10a) which are formed on each block (5). The first sipe (10) extends in a first longitudinal direction (A) and comprises a first linear portion (11) which substantially extends along the first longitudinal direction (A) towards a first edge (8) of the block (5), only one single-wave portion (12) which extends in continuation of the first linear portion (11) and which has a distance from the first edge (8) between 5% and 40% of the distance between the first edge (8) and an opposite second edge (9) and a second linear portion (13) which extends in continuation of the single-wave portion (12) towards the second edge (9). Similarly, the second sipe (10a) extends in a second longitudinal direction (B) and comprises a first linear portion (11) which substantially extends along the second longitudinal direction (B) towards the second edge (9) of the block (5), only one single-wave portion (12) which extends in continuation of the first linear portion (11) and which has a distance from the second edge (9) between 5% and 40% of the distance between the first edge (8) and the second edge (9) and a second linear portion (13) which extends in continuation of the single-wave portion (12) towards the first edge (8).
The present invention generally relates to elastomer compositions comprising at least one sp2 hybridized carbon allotrope and a 2,5- disubstituted pyrrole derivative, preferably provided as a pre-formed adduct, the process for their preparation and tyres comprising such elastomer compositions. The present invention further relates to adducts between said pyrrole derivatives and sp2 hybridized carbon allotropes as well as to the process for their preparation.
C07D 207/30 - Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
A tyre for vehicle wheels comprises, in a central annular portion (A) of its tread band (110), a central circumferential groove (115) extending on axially opposite parts with respect to the equatorial plane (E) of the tyre, a circumferential row of first blocks (125) having a respective axially inner side (126) delimited by the central circumferential groove (115) and a respective axially outer side (127) delimited by a respective first circumferential groove (120) and a circumferential row of second blocks (155) having a respective axially inner side (156) delimited by the central circumferential groove (115) and a respective axially outer side (157) delimited by a respective second circumferential groove (160) arranged on the axially opposite part to the respective first circumferential groove (120) with respect to the central circumferential groove (115). The axially inner side (126; 156) of each of the first blocks (125) and second blocks (155) comprises, in the circumferential direction, respective opposite free ends (126a, 126b; 156a, 156b) and a respective central portion (126c; 156c). The first blocks (125) are circumferentially offset with respect to the second blocks (155) so that the opposite free ends (126a, 126b) of each of the first blocks (125) are arranged at the central portions (156c) of two circumferentially consecutive second blocks (155) and the opposite free ends (156a, 156b) of each of the second blocks (155) are arranged at the central portions (126c) of two circumferentially consecutive first blocks (125).
UNIVERSITA' DEGLI STUDI DI MILANO - BICOCCA (Italy)
Inventor
Susanna, Antonio
Donetti, Raffaella
Hanel, Thomas
Milana, Paola
Scotti, Roberto
Mostoni, Silvia
Di Credico, Barbara
D'Arienzo, Massimiliano
Abstract
The present invention relates to a compound represented by the formula (II): WF-O-ROS-GC-Fe (II) wherein WF represents the white filler, O represents one or more oxygen bridge bonds, ROS represents an organo-silane residue, GC represents one or more coordinating groups forming a chelate with iron in ionic form, and Fe represents iron in ionic form (Fe3+) coordinated with the coordinating groups, a process for the preparation thereof, and its use in the vulcanisation process of elastomeric compounds.
A vehicle wheel tyre (1) comprises a tread band (2), a tread surface (3), a plurality of blocks (5, 6) defined on the tread band (2), and at least one sipe (15) formed on at least one of the blocks (5). The at least one sipe (15) is open on a tread surface portion (7) and at least on one first edge (11) of the block (5), so as to define at least one first edge portion (20) and at least one second edge portion (21) adjacent to each other and at least partially bounded by the sipe (15), wherein the first edge portion (20) is defined by a chamfer (22) extending between the tread surface portion (7) and a wall (8) of the block (5), and the second edge portion (21) is defined by a corner (23) resulting from the tread surface portion (7) intersecting the wall (8).
The present invention relates to a big enduro motorcycle tyre for mainly off-road use. By virtue of the particular "cap and base" arrangement of the tread band and to the specific mechanical properties of the compounds which constitute it, the tyre of the invention improves performance both off-road and in road driving, both on dry and wet surfaces.
A tyre (1) for motorcycle wheels is described comprising a tread band (8) of the "cap-and-base" type comprising a radially outer portion, formed by a central sub-portion (11a) made with a first vulcanized elastomeric material and by a pair of lateral sub-portions (11b, 11c) made with a second vulcanized elastomeric material, and a radially inner portion (12) made with a third vulcanized elastomeric material. The first vulcanized elastomeric material of the central sub-portion (11a) has a dynamic elastic modulus (E') measured at a frequency of 10Hz and at 23°C greater than the dynamic elastic modulus (E') measured in the same conditions of the second vulcanized elastomeric material of the lateral sub-portions (11b, 11c) and both such vulcanized elastomeric materials have a respective dynamic elastic modulus (E'), again measured at a frequency of 10Hz and at 23°C, comprised between 5.2 and 6.5 MPa and greater than the dynamic elastic modulus (E') of the third vulcanized elastomeric material, measured in the same conditions. In the tyre (1), the ratios R1 and R2 between the dynamic elastic modulus and the tandelta of the second vulcanized elastomeric material of the lateral sub-portions (11b, 11c) of the radially outer portion and the dynamic elastic modulus and the tandelta of the third vulcanized elastomeric material of the radially inner portion (12) of the tread band (8), respectively measured at a frequency of 10Hz and at 100°C and at a frequency of 10Hz and at 70°C, are comprised between 0.8 and 1.2.
Tyre (99) comprising a monitoring device (1 ), wherein the monitoring device (1 ) comprises an electronic unit (3) and an electric power supplier (4) electrically connected to each other, wherein the electronic unit (3 ) comprises at least one sensor (5) for detecting at least one of the following physical quantities: temperature, pressure, acceleration, deformation; a processing unit (6); a transceiver (7), wherein the monitoring device (1 ) comprises a rigid printed circuit board (8) comprising a first face (9) and a second face (10) opposite to each other, wherein the monitoring device (1 ) comprises at least one adhesive layer (20) proximal to the second face (10) for fixing the rigid board (8) to an inner surface (2) of the tyre (99), wherein the electronic unit (3) and the electric power supplier (4) are both fixed onto the first face (9) of the rigid board (8).
A tyre for vehicle wheels comprises a structural component including a plurality of textile reinforcing cords (10) made by twisting together two yarns (20a, 20b), at least one of which comprising a plurality of filaments (22a, 22b) and a monofilament textile wire having a diameter lower than 0.21 mm and that, in any cross section of the yarn, is at least partially embedded in said filaments (22a, 22b). At least some of said filaments (22a, 22b) and/or the monofilament textile wire are/is made of an at least partially recycled or biologically-based material. The aforementioned structural component is a carcass ply and/or a stiffening layer associated with the carcass ply at or close to a respective turned end edge of the carcass ply.
The present invention relates to a tyre comprising at least one structural element that includes a vulcanised elastomeric material obtained by vulcanisation of a vulcanisable elastomeric compound made by mixing an elastomeric composition comprising per 100 phr of diene elastomeric polymer: (a) 30 to 95 phr of at least one styrene-butadiene polymer (SBR); (b) 5 to 70 phr of at least one diene elastomeric polymer selected from the group consisting of at least one isoprene polymer (IR), at least one butadiene polymer (BR), or mixtures thereof; (c) 10 phr to about 120 phr, preferably 20 phr to 100 phr, of at least one white reinforcing filler; (d) from about 1 % to about 20% by weight, relative to the amount of said white reinforcing filler, of at least one silane coupling agent; (e) 1 % to 35% by weight, preferably 5% to 25% by weight, relative to the amount of said silane coupling agent, of a polyamine.
A tyre for vehicle wheels comprises a structural component including a plurality of hybrid reinforcing cords (10) made by twisting together two yarns (20a, 20b) each comprising a plurality of filaments (22a, 22b). A single yarn (20a) of the two yarns (20a, 20b) also comprises a single monofilament textile wire (21a) that, in any cross section of the yarn (20a), is at least partially embedded in the filaments (22a) of the yarn (20a).
The present invention relates to an elastomeric compound for tyres for vehicle wheels, in particular an elastomeric compound for tread band of a tyre, preferably for big enduro motorcycles. By virtue of the use of special diene elastomeric polymers in admixture, preferably associated with liquid polymers, the elastomeric compound incorporated in the tread band gives the tyre long mileage together with high handling, especially in wet conditions.
The present invention relates to a tyre for vehicle wheels comprising at least one structural component comprising a vulcanised elastomeric compound obtained by vulcanising a vulcanisable elastomeric compound made by mixing an elastomeric composition comprising (i) at least one diene elastomeric polymer, and (ii) a reinforcing filler comprising (a) needle-shaped morphology silicate fibres having nanometric size, (b) carbon nanotubes, and (c) optionally, carbon black and/or conventional silica.
The present invention relates to a tyre for vehicle wheels comprising at least one structural component comprising a vulcanised elastomeric compound obtained by vulcanising a vulcanisable elastomeric compound made by mixing an elastomeric composition comprising (i) at least one diene elastomeric polymer, and (ii) a reinforcing filler comprising (a) needle-shaped morphology silicate fibres having nanometric size, and (b) finely dispersed carbon black having a surface area NSA greater than 100 m2/g and a surface area OAN greater than 100 ml/100g, and (c) optionally, conventional silica.
Control method and system (99) of a vehicle (1) moving on a road surface, wherein the system comprises a detection module (2) for detecting in real time a respective hydroplaning intensity (HI) for each tyre (3) of the vehicle (1), an actuation device (9) connected to each wheel (7) of the vehicle (1) and a command and control unit (8) programmed and configured for performing the control method comprising: - comparing each respective hydroplaning intensity (HI) with a first threshold; - upon the occurrence of a starting condition such that the respective hydroplaning intensity (HI) of at least one tyre (3) reaches the first threshold, then: - calculating in real time a reference value (YRr) of a parameter representative of a lateral motion of the vehicle (1) as a function of a longitudinal speed (Vxc) and of a steering angle (STA) of the vehicle; - calculating in real time a corrective moment (Mz) as a function of the reference value (YRr) and of a current value (YRc) of the parameter detected in real time; - applying in real time to each wheel (7) a respective torque (Tr) calculated in real time as a function of the corrective moment (Mz) and of the hydroplaning intensity (HI) of the respective tyre (3).
B60T 8/172 - Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
B60T 8/1755 - Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve
A tyre (100) for vehicle wheels, comprises a tread band (109) having a first annular portion (109a) delimited by two circumferential channels (10a, 10b) and comprising two annular grooves (50, 55) extending along respective zig-zag paths. Each of the two annular grooves (50, 55) is defined by a plurality of first parts (51, 56) inclined on one side with respect to a reference plane (T) orthogonal to an equatorial plane (M-M) of the tyre and by a plurality of second parts (52, 57) inclined with respect to the reference plane (T) on the opposite side to the first parts (51, 56). Each of the second parts (52, 57) is circumferentially interposed between two respective first parts (51, 56). Each of the first parts (51, 56) is connected to a respective circumferential channel (10a, 10b) by a respective first transversal groove (60, 65) arranged at an intermediate portion of the first part (51, 56) and by a respective second transversal groove (80, 85) arranged at an end of the first part (51, 56).
The invention relates process and an apparatus for labeling a green bicycle tire. The process comprises -fitting a tyre (2) around a support table (11); -positioning, in a pressing area (23) arranged on the support table (11), a tread junction (6a) carried by the tyre (2) fit around the support table (11); -applying at least one label (32) on the tyre (2); -pressing the tread junction (6a) during the application of said at least one label (32).
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