To provide a piston ring that has low content of a sulfur atom, eliminates the need for a special exposing device and a strict safety measure, and is low in cost. A piston ring 1 is used in a reciprocating compressor that compresses gas and is formed of a resin composition containing at least polyetheretherketone resin or thermoplastic polyimide resin as a main component. The resin composition contains carbon material in which the content of a sulfur atom is 200 ppm or less. The carbon material is at least one of carbon fiber, graphite, and coke powder. The resin composition contains total 5-35 volt of the carbon material relative to the whole of the resin composition.
F16J 9/28 - Piston-rings, seats thereforRing sealings of similar construction in general characterised by the use of particular materials of non-metals
In a parallel link mechanism, a distal end side link hub is coupled to a proximal end side link hub via three link mechanisms such that a posture of the distal end side link hub can be changed. Each link mechanism includes a proximal side end link member, a distal side end link member, and a center link member, and forms a quadric chain link mechanism composed of four revolute pairs. A singular point occurs when a central axis of the proximal or distal end side link hub and a central axis which is a rotation axis of a revolute pair section of the proximal or distal side end link member and the center link member coincide with each other. An axis angle of the center link member is specified such that a posture in which the singular point occurs is avoided.
A deep groove ball bearing includes: an inner ring; an outer ring; balls interposed between the inner ring and the outer ring; and a corrugate steel plate retainer of a rolling element-guided type for retaining the balls. Each of cross sections in a circumferential direction and a radial direction which passes through the deepest portion of a pocket of the corrugate steel plate retainer is an arc-shaped curved surface. A contact point between the pocket and the ball on the cross section in the radial direction of the corrugate steel plate retainer is positioned in a retainer pocket surface. Further, a curvature radius of the retainer pocket surface in the radial direction is equal to or less than a curvature radius of the retainer pocket surface in the circumferential direction.
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
A tapered roller bearing of an inner ring guide form according to the present disclosure includes a retainer including: a small-diameter-side annular part; a large-diameter-side annular part; and pillar parts which connect the small-diameter-side annular part and the large-diameter-side annular part. The following relational expression is satisfied by a small-diameter-side gap S1 which is a radial gap between the small-diameter-side annular part and a smaller collar part of an inner ring, a large-diameter-side gap S2 which is a radial gap between the large-diameter-side annular part and a larger collar part of the inner ring, an average roller diameter d of a tapered roller, a roller length 1, and an outer ring angle a. Equations, ΔS=S2 −S1 and S0=0.5 (fixed values), are established.
A tapered roller bearing of an inner ring guide form according to the present disclosure includes a retainer including: a small-diameter-side annular part; a large-diameter-side annular part; and pillar parts which connect the small-diameter-side annular part and the large-diameter-side annular part. The following relational expression is satisfied by a small-diameter-side gap S1 which is a radial gap between the small-diameter-side annular part and a smaller collar part of an inner ring, a large-diameter-side gap S2 which is a radial gap between the large-diameter-side annular part and a larger collar part of the inner ring, an average roller diameter d of a tapered roller, a roller length 1, and an outer ring angle a. Equations, ΔS=S2 −S1 and S0=0.5 (fixed values), are established.
1.06
<
1
tan
α
(
1
-
Δ
S
S
o
d
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<
1.64
F16C 19/36 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
To provide a sealed rolling bearing that is capable of achieving both of low torque performance and high sealing performance. A hub bearing 1 has a seal member 13 that seals a bearing space 9 and is fixed to a fixed side member 12 to be in sliding contact with a rotating side member 15. The seal member 13 has a seal lip that is in sliding contact with the rotating side member 15. Grease is applied to at least one of a sliding contact surface of the seal lip and a sliding contact surface of the rotating side member 15 with which the seal lip is in sliding contact. The grease contains a base oil and a thickener. The kinematic viscosity at 40° C. of the base oil is 6-45 mm2/s. The worked penetration of the grease measured based on JIS K 2220 is 220-320.
Provided is a tapered roller bearing in which an inner ring assembly is integrated by a connector such as a wire and a connector can be removed after incorporating a bearing, and the tapered roller bearing can realize a roller guide. The tapered roller bearing removably includes a falling-off preventer to prevent a tapered roller contained in a pocket having a first guide claw extending toward an inner diameter side of a retainer segment from falling off toward the outer diameter side. The falling-off preventer is engaged with an outer diameter surface and a large-diameter-side lateral-surface of a large-diameter-side arc-shaped portion of the retainer segment. The retainer segment and the falling-off preventer are connected with the connector.
F16C 19/36 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
A ball bearing includes rivets each including a columnar rivet shaft; a pre-formed head formed beforehand at one end of the rivet shaft; and a crimped head formed by crimping the other end of the rivet shaft. The crimped head of each rivet is formed to satisfy the following formula: 1.25×Vo
F16C 33/42 - Ball cages made from wire or sheet-metal strips
F16B 5/04 - Joining sheets or plates to one another or to strips or bars parallel to them by means of riveting
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
A ball screw device includes a nut including a nut main body and a cover, a screw shaft, a rolling path formed by a screw groove of the nut main body and a screw groove of the screw shaft, a circulation path formed by an outer circumferential surface of the nut main body and the cover, a pair of connection paths that allow one end of the circulation path and one end of the rolling path to be communicated with each other and allow the other end of the circulation path and the other end of the rolling path to be communicated with each other, respectively, and a large number of balls disposed in the rolling path, the circulation path, and the pair of connection paths. The circulation path is formed along a cylindrical path of the outer circumferential surface of the nut main body.
In a bearing sleeve 8 (fluid dynamic bearing) including a cylindrical sintered body formed with dynamic pressure generating grooves G1 on an inner peripheral surface 8a, a ratio D2/D1 of an outer diameter D2 to an inner diameter D1 of the sintered body is 2.5 or less, and differences in relative density among three parts 8A, 8B, 8C defined by trisecting the sintered body in an axial direction are within 3%.
In a state where a joint forms a normal operating angle and an axial line of an inner ring is not tilted with respect to an axial line of a leg shaft, when a curvature radius and a minor axis/major axis ratio at which a contact area between an inner ring inner peripheral surface and a leg shaft outer peripheral surface is minimized are set as respective reference values, the minor axis/major axis ratio is set to the reference value, and the curvature radius is set to be smaller than the reference value. In addition, a carbon content in a core portion of a tripod member is set to 0.23 to 0.44%, and a hardened layer is formed through carburizing and quenching on a surface of each leg shaft.
F16D 3/205 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
F16D 3/202 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints
A rolling bearing includes: inner and outer rings; a plurality of balls; a retainer configured to retain the plurality of balls; and a seal member attached to the outer ring and configured to close a bearing space between the inner ring and the outer ring. The seal member is a contact seal including a lip configured to come into contact with the seal groove. The seal groove has an outer groove wall surface which is an inclined surface which is inclined toward an outer diametric side as the inclined surface extends outward in an axial direction. The lip has a tip end part having a round shape so that the tip end part contacts the outer groove wall surface of the seal groove at from 80 to 100°. The outer groove wall surface has an inclination angle of from 55 to 65° with respect to the axial direction.
F16C 33/78 - Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
A mechanical component has a surface and is made of steel subjected to quenching and tempering. The mechanical component includes a nitrided layer formed at the surface. Steel contains at least 0.95 mass % and at most 1.10 mass % of carbon, less than 0.30 mass % of silicon, less than 0.50 mass % of manganese, less than 0.0080 mass % of sulfur, at least 1.3 mass % and at most 1.6 mass % of chromium, and a remainder composed of iron and an inevitable impurity. An average nitrogen concentration at the surface is equal to or more than 0.10 mass %. A hardness at the surface is equal to or more than 850 Hv. An amount of retained austenite at the surface is equal to or less than 20 volume %.
A bearing device includes a bearing and a retaining member. The retaining member is fixed to any one ring of an outer ring and an inner ring. A circuit board is fixed to, in an axial direction, a front surface of a side plate portion. At least one gas sensor, which detects a state of the bearing, and a wireless communication circuit, which wirelessly transmits an output of the gas sensor to outside, are mounted on the circuit board.
In a fixed type constant velocity universal joint 1 having eight balls rotationally driven by an electric motor, grease G having an initial consistency of consistency number 1 to 2 and mixing stability of 390 to 440 is used. An initial pocket gap δ represented by a difference (H−DBALL) between an axial width H of a pocket 5a and a diameter DBALL of a torque transmitting ball 4 is set to −21 μm or more and −6 μm or less.
F16D 3/2245 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines of each coupling part lying on a sphere where the groove centres are offset from the joint centre
To provide a rolling bearing cage that is superior in heat resistance and realizes superior moldability even in a case in which the cage has a thick wall, and a rolling bearing using the cage. A cage 5 is an annular rolling bearing cage formed by injection-molding a resin composition. The rolling bearing cage 5 includes rolling elements and a plurality of pockets 6 for retaining the rolling elements. A thickness in a radial direction of an axial end surface 5a of the cage 5 is 2.00 mm or more. The resin composition contains polyamide resin as a base resin. The polyamide resin is copolymerized polyamide containing a hexamethylene terephthalamide unit and a hexamethylene adipamide unit as a constitutional unit.
F16C 19/16 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
A ring body configured to be fitted over the extension ring portion is provided. The ring body is a non-endless ring body having a cut portion formed in a part of the ring body. Opposed cut-portion end surfaces of the cut portion are separated from each other by a predetermined distance under a state in which the ring body is press-fitted over the extension ring portion of the inner ring. The cut-portion end surfaces are brought relatively closer to each other to radially contract the ring body by fastening a fastening member to be mounted into the ring body so that a radially contracting force for radial contraction is applied to the extension ring portion to bring the extension ring portion into close contact with the rotary shaft.
F16C 35/073 - Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
The circuit board includes: at least one sensor that detects a state of the standard bearing; a wireless communication circuit; and a power supply circuit that converts the AC power generated by the generator into DC power. The magnetic ring, the stator, and the circuit board are disposed inside an annular space formed by an end portion of the outer ring and an end portion of the inner ring.
Provided is a tapered roller bearing which includes an inner ring including a collar part, an outer member having an annular rolling surface in opposition to a rolling surface of the inner ring, tapered rollers interposed between the inner ring and the outer member, and a retainer configured to be guided by the inner ring, retaining the tapered rollers, and including small- and large-diameter-side annular parts, and pillars connecting the small- and large-diameter-side annular parts at more than one circumferential location. At least one of the small-or large-diameter-side annular parts includes an arcuate bent part from the pillars and a flanged part extending radially inwards from the bent part. The bearing satisfies the inequalities 0.50018<(d1/d2)/2<0.5049; and 0.50018<(d1/d2)/2<0.5056X(−00.002) involving the inner diameter of the flanged part d1, the outer diameter of the collar part of the inner ring d2, and the centrifugal acceleration of the revolution of the bearing X.
F16C 19/36 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
In inspecting the number of balls 30 disposed in circulation paths S1 to S3 of a ball screw device 1, an inspection jig 40 is inserted between the balls 30 disposed in the circulation paths S1 to S3 from a gap between a nut 10 and a screw shaft 20, and the number of the balls 30 is inspected by an insertion state of the inspection jig 40 at this time.
A crown-shaped cage resin entirely formed of a resin material is provided. The steel ball diameter D of each steel ball received in a respective one of pockets is 13 to 18 mm. The wall thickness t of the cage from the bottom of each pocket to the end surface of an annular portion on the other axial side is 10 to 20% of the steel ball diameter D. The axial length HB of each claw of each horn portion is 60 to 80% of the steel ball diameter D. When the tensile strength of the resin material is denoted by σ, the cross-sectional area A of a portion of the cage between each circumferentially adjacent pair of pockets is set within the range of the following formula: A>(511D-4027)/σ.
A detection unit acquires detection data of a wind turbine generator. A controller generates maintenance information of the wind turbine generator based on the detection data. The controller transmits maintenance information to a maintenance terminal.
A plunging-type constant velocity universal joint includes outer and inner joint members having linear track grooves, balls, and a cage accommodating the balls in pockets. Curvature centers of spherical outer and inner peripheral surfaces of the cage are offset toward opposite sides with respect to a joint center. A range between distances of 10 mm towards deep and opening sides from a center portion of a sliding range of the track groove of the outer member in the axial direction is a center range, and a region in which a PCD of the track grooves of the outer member becomes smallest is in the center range. A minimum value of a PCD clearance in the track grooves in the center range is from 0.010 mm to 0.100 mm. A PCD mutual difference of the track grooves of the outer member in the center range is 0.150 mm or less.
F16D 3/227 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines of each coupling part lying on a cylinder co-axial with the respective coupling part the joints being telescopic
F16D 3/223 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
Each second rivet hole has an inner periphery constituted by a cylindrical shear surface having a constant inner diameter that does not axially change; and a tapered fracture surface gradually radially expanding from the shear surface toward an abutment surface.
F16C 33/42 - Ball cages made from wire or sheet-metal strips
B21D 53/12 - Making other particular articles parts of bearingsMaking other particular articles sleevesMaking other particular articles valve seats or the like cages for bearings
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
In a tripod type constant velocity universal joint of a double roller type, a projection 40 is provided in regions including both end portions in a direction orthogonal to a joint axial line O on a shaft end side with respect to an inner ring 12 on an outer peripheral surface of a leg shaft 32 of a tripod member 3. A ratio T/ag1 between a dimension T in a direction of the joint axial line O of the projection 40 and a major diameter ag1 of a contact portion with the inner ring on the outer peripheral surface of the leg shaft 32 is 0.3 or more.
F16D 3/205 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
A wheel bearing device capable of improving indentation resistance at the outer side of an outer member by reducing a quenching crack and deterioration in crystal grain size as much as possible. The outer member (outer ring (2)) is to have an inner-side induction-hardened part (9a) formed by means of induction hardening along an inner-side outer raceway surface (2g) and an outer-side induction-hardened part (9b) formed by means of induction hardening along an outer-side outer raceway surface (2h), wherein the outer-side induction-hardened part (9b) has a deeper hardened layer depth (D) than the hardened layer depth E of the inner-side induction-hardened part (9a), and the inner-side induction-hardened part (9a) and the outer-side induction-hardened part (9b) are separated from each other.
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
Provided are a cage for a rolling bearing capable of satisfying different required characteristics while securing cage strength, and a rolling bearing using the cage. A cage 5 holds a plurality of balls 4 in a rolling bearing 1, is guided by an outer ring 3, and includes: cage bodies 8 and 11 having an annular shape and including a pocket hole for accommodating each of the balls 4; a resin portion 9 formed at least in a portion on which each of the balls 4 slides in an inner surface of the pocket hole of the cage body 8; and a resin portion 12 having a composition different from that of the resin portion 9 and formed in a guide portion of the cage body 11 sliding on the outer ring 3.
A mobile hydrogen supply system includes a natural energy power generation device that generates electric power from natural energy, and a hydrogen generation device that generates hydrogen. The hydrogen generation device is operable on electric power generated by the natural energy power generation device, and the natural energy power generation device and the hydrogen generation device are transportable.
Gel Sheet Chip, Method For Manufacturing Gel Sheet Chip, Sample Collecting Method, Gel Plate, Sample Collecting Set, Culture Implement, and Method For Manufacturing Culture Implement
A gel sheet chip includes a film, a frame, gel, and a sample to be collected. The frame is placed on the film and a through-hole is formed in the frame. The gel is disposed on the film in the through-hole. The sample to be collected is supported by the gel.
A bearing device for a vehicle wheel suppresses shaking of a vehicle wheel mounting flange by defining dimensional relationships of the various components of the vehicle wheel mounting flange. A vehicle wheel mounting flange (3b) includes a plurality of screw holes (31) into which wheel bolts are screwed, and a rib (35) provided on an inner side circumferential edge of the screw holes (31). When A represents a nominal diameter of the screw hole (31), B represents a width direction dimension of the rib (35) in a cross-section that passes through the center of the screw hole (31) and that is tangent to the pitch circle of the screw hole (31), and C represents a thickness direction dimension of the vehicle wheel mounting flange (3b) that passes through the rib (35), B/A≥1.7 and C/A≥0.8 are satisfied.
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
30.
SILICON NITRIDE SINTERED BODY, MACHINE PART USING THE SAME, AND BEARING
To provide: a silicon nitride sintered body having excellent mechanical property and imparting superior lifetime to a product into which the silicon nitride sintered body is processed; a machine part using the silicon nitride sintered body; and a bearing. The silicon nitride sintered body: has the crystallinity of 75-90% calculated by the following formula based on an XRD diffraction pattern on a mirror-polished cutting face of the silicon nitride sintered body; contains one element or more of Y, Ce, Nd and Eu in an amorphous phase; and does not have an inclusion having a diameter of more than 50 μm and a pore having a diameter of more than 50 μm in a surface layer portion.
To provide: a silicon nitride sintered body having excellent mechanical property and imparting superior lifetime to a product into which the silicon nitride sintered body is processed; a machine part using the silicon nitride sintered body; and a bearing. The silicon nitride sintered body: has the crystallinity of 75-90% calculated by the following formula based on an XRD diffraction pattern on a mirror-polished cutting face of the silicon nitride sintered body; contains one element or more of Y, Ce, Nd and Eu in an amorphous phase; and does not have an inclusion having a diameter of more than 50 μm and a pore having a diameter of more than 50 μm in a surface layer portion.
Crystallinity (%)=Crystalline peak area/(Crystalline peak area+Amorphous peak area)×100
A ball screw device 4 includes a screw shaft 9 having a screw groove 9a formed in an outer peripheral surface, a nut 8 having a screw groove 8a formed in an inner peripheral surface, and a large number of balls 10 arranged between the screw groove 9a of the screw shaft 9 and the screw groove 8a of the nut 8. A ratio Δr/L1 of a radial gap Δr, which is a maximum amount of radial movement of the nut 8 with respect to the screw shaft 9, to an axial span L1 between the large number of balls 10 is made larger than 1/2000.
A ball bearing includes a cage circular annular portion and a seal member. The cage circular annular portion has a cage-side sliding contact surface axially opposed to the seal member and configured to come into sliding contact with the seal member. The seal member has a seal-side sliding contact surface configured to come into sliding contact with the cage-side sliding contact surface. A plurality of axial protrusions each having an axially convex circular arc shape in cross sections along a circumferential direction are formed on one of the cage-side sliding contact surface and the seal-side sliding contact surface at constant pitches in the circumferential direction.
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
An outer surface rubber portion is formed to cover the entire axially outer surface of a metal core. An inner surface rubber portion is formed with a circular annular opening through which the axially inner surface of the metal core is exposed on the same circumference passing on the radially outer side of minute protrusions; and circular arc-shaped openings through which the axially inner surface of the metal core is exposed on the same circumference passing on the radially inner side of the minute protrusions.
A rolling component has a surface and is made of steel. The rolling component comprises a surface layer portion that is a region up to 20 m in depth from the surface. The rolling component is intended for use with hydrogen-utilizing equipment. The steel contains 0.70 mass percent or more and 1.10 mass percent or less of carbon, 0.15 mass percent or more and 0.35 mass percent or less of silicon, 0.30 mass percent or more and 0.60 mass percent or less of manganese, 1.30 mass percent or more and 1.60 mass percent or less of chromium, 0.01 mass percent or more and 0.50 mass percent or less of molybdenum, and 0.01 mass percent or more and 0.50 mass percent or less of vanadium, with a balance consisting of iron and unavoidable impurities. In the surface layer portion, the steel has a nitrogen concentration of 0.2 mass percent or more.
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
C21D 9/36 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for ballsHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for rollers
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
A control device controls an attitude control actuator by means of which a distal end member located on a link actuation device can be moved. A parallel linkage mechanism includes a proximal end-side link hub, a distal end-side link hub, and three linkages via which the distal end-side link hub is coupled to the proximal end-side link hub in such a manner that allows the attitude of the distal end-side link hub to change relative to the proximal end-side link hub. The control device includes a parameter switcher which switches control parameters to adjust the jerk of the attitude control actuator or the distal end member based on a load applied to the distal end member. The parameter switcher can switch more than one control parameter including at least one of the filter time constant of a moving average filter or a model following control gain.
A plunging type constant velocity universal joint has six torque transmission balls, and a curvature center of a spherical outer peripheral surface and a curvature center of a spherical inner peripheral surface of a cage are offset toward opposite sides in an axial direction with respect to a joint center. The plunging type constant velocity universal joint is used at a normal operating angle of from 8° to 12°. A ratio DBALL/DSPCD of a diameter (DBALL) of the torque transmission ball to a spline pitch circle diameter (DSPCD) of a coupling hole of an inner joint member is within a range of 0.80 to 0.86. A contact angle of the torque transmission ball and a linear track groove is within a range of 32° to 35°. A contact ratio of the torque transmission ball and the linear track groove is within a range of 1.05 to 1.08.
F16D 3/226 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines of each coupling part lying on a cylinder co-axial with the respective coupling part
F16D 3/223 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
37.
SILICON NITRIDE SINTERED BODY, MACHINE PART, AND BEARING
To provide a silicon nitride sintered body, a machine part and a bearing that have superior mechanical properties and sliding properties. A rolling element 4 is a silicon nitride sintered body including a silicon nitride particle, a rare earth element and an aluminum element. In a range in which the sum of the area of the upper-size crystal grain diameter within a range where the crystal grain diameter of a β-type Si3N4 particle in the silicon nitride sintered body has the crystal orientation of 15-180 degrees, is 30% relative to an area of the total crystal grain diameter, the crystal grain diameter of the β-type Si3N4 particle is 1-4 μm by circle equivalent diameter and/or the aspect ratio of the β-type Si3N4 particle is 3-6.
C04B 35/584 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on borides, nitrides or silicides based on silicon nitride
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
A casing 10 that accommodates an electric motor 2 and a ball screw 30 as a motion conversion mechanism 3 includes a first case 11 that is made of an aluminum alloy and accommodates the electric motor 2 and a second case 12 that is coupled to the first case 11 in an axial direction in a state of accommodating the ball screw 30. The electric motor 2 is supported by the second case 12 via a metal bracket 8 and a screw 9, and the entire outer surface of at least one of the metal bracket 8 and the second case 12 is covered with an insulating film C.
A plunging type constant velocity universal joint includes an outer joint member having a plurality of linear track grooves, an inner joint member having a plurality of linear track grooves, a plurality of torque transmission balls, and a cage configured to accommodate the torque transmission balls in pockets. A curvature center of a spherical outer peripheral surface and a curvature center of a spherical inner peripheral surface of the cage are offset toward opposite sides in an axial direction with respect to a joint center. A spherical clearance that allows guide in contact is formed between a spherical outer peripheral surface of the inner joint member and a spherical inner peripheral surface of the cage. A positive axial clearance is formed between the pocket of the cage and the torque transmission ball.
F16D 3/2245 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines of each coupling part lying on a sphere where the groove centres are offset from the joint centre
F16D 3/223 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
A feed screw mechanism includes a rotary member having a female screw portion, a linear motion member having a male screw portion screwed to the female screw portion and making a linear motion with rotation of the rotary member, a lubricant between the female and male screw portions, a housing housing the rotary and linear motion members, and a wall portion protruding, in a radial direction, from the outer peripheral surface of the linear motion member. The wall portion moves together with the linear motion member, and an outer radial end portion of the wall portion is disposed: to not contact the inner peripheral surface of the housing and a member provided on the inner peripheral surface of the housing; or to be slidable with respect to the inner peripheral surface of the housing or the member provided on the inner peripheral surface of the housing.
F16H 25/24 - Elements essential to such mechanisms, e.g. screws, nuts
F15B 15/14 - Fluid-actuated devices for displacing a member from one position to anotherGearing associated therewith characterised by the construction of the motor unit of the straight-cylinder type
A rolling component has a surface and is made of steel. The rolling component comprises a surface layer portion that is a region up to 20 μm in depth from the surface. The steel contains 0.70 mass percent or more and 1.10 mass percent or less of carbon, 0.15 mass percent or more and 0.35 mass percent or less of silicon, 0.30 mass percent or more and 0.60 mass percent or less of manganese, 1.30 mass percent or more and 1.60 mass percent or less of chromium, 0.01 mass percent or more and 0.50 mass percent or less of molybdenum, and 0.01 mass percent or more and 0.50 mass percent or less of vanadium, with a balance consisting of iron and unavoidable impurities. In the surface layer portion, the steel has a nitrogen concentration of 0.2 mass percent or more.
A shell type roller bearing includes a shell outer ring that includes a cylindrical portion (12) and a flange (13) extending radially inward from one axial end of the cylindrical portion and that is made of an austenitic stainless steel material. One axial end portion of an inner peripheral surface (16) of the cylindrical portion (12) is a tilted surface (16b), the inner diameter of the tilted surface (16b) is larger than the inner diameter of an axial middle region of the inner peripheral surface (16), and the hardness of the flange (13) is in the range of 300 to 450 HV.
F16C 33/78 - Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
F16C 19/26 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
A grinding apparatus includes: a grinding member driving unit having a motor that rotates a grinding member; a table driving unit that brings the grinding member into contact with a workpiece by moving the grinding member and the workpiece relative to each other; an AE sensor that detects an acoustic emission generated when the grinding member and the workpiece are brought into contact with each other; and a controller that controls a cut-in speed of the grinding member into the workpiece by controlling the table driving unit. The controller controls the cut-in speed using an output of the AE sensor and a motor current of the grinding member driving unit.
B24B 49/00 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or workArrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
B24B 49/10 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or workArrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
B24B 51/00 - Arrangements for automatic control of a series of individual steps in grinding a workpiece
A mechanical component includes steel and has a surface. The steel is quenched and tempered. The mechanical component includes a nitrided layer on the surface and a core farther away from the surface than the nitrided layer. A nitrogen concentration in the steel on the surface is greater than or equal to 0.01 mass percent. A hardness of the steel on the surface is greater than or equal to 820 Hv. An amount of residual austenite in the steel in the core is greater than or equal to 0.1 volume percent and less than or equal to 9 volume percent. A dislocation density of the residual austenite in the steel in the core is greater than or equal to 4.0×1014 m−2. The steel is high carbon steel or bearing steel.
C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
C21D 1/18 - HardeningQuenching with or without subsequent tempering
C21D 9/40 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for ringsHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for bearing races
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
A vibration measurement device includes an acceleration sensor, an acceleration sensor mounting fixture, a spacer as an insulating member, and a heat shrink tube. The acceleration sensor includes an element. The acceleration sensor mounting fixture is disposed on a side of the acceleration sensor, adjacent to an object under measurement. The spacer is sandwiched between the acceleration sensor and the acceleration sensor mounting fixture so as to be in contact with both the acceleration sensor and the acceleration sensor mounting fixture. The heat shrink tube covers a sensor outer edge and a mounting fixture outer edge. The heat shrink tube includes a region protruding outward of acceleration sensor and the acceleration sensor mounting fixture as viewed from above.
This transmission shaft is used in a transmission and has a raceway surface on which needle rollers roll. The transmission shaft includes a base material and a triiron tetraoxide film. The base material includes any one of chromium steel, chromium-molybdenum steel, or nickel-chromium-molybdenum steel, and has, on a surface thereof, a diffusion layer including crystal grains of at least one of iron carbide, iron nitride, or iron carbonitride. The triiron tetraoxide film is formed on the surface of the base material and is disposed at least on the raceway surface.
In a tripod type constant velocity universal joint 1 of a double roller type, a carbon content in a core portion of a tripod member 3 is set to 0.23 to 0.44%, and a hardened layer 16 of a carburized layer is provided on the surface of a leg shaft 32. A first region P having a radius of curvature Ra in a cross section in a direction orthogonal to a joint axial direction including an axial line of the leg shaft 32 and a second region Q having a radius of curvature Rb in a cross section in the joint axial direction including the axial line of the leg shaft 32 are provided in an intermediate portion 33 provided between a body portion 31 of the tripod member 3 and the leg shaft 32. Ra>Rb is set.
F16D 3/205 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
A bearing includes a plurality of claws located in a circumferential direction at an end face of an inner ring and protruding from the end face of an inner ring in an axial direction. A lock mechanism can be used to fasten the claws to a shaft. At least one of the plurality of claws has an opening provided therein.
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
F16C 23/08 - Ball or roller bearings self-adjusting
49.
SENSOR HOLDER AND BEARING DEVICE FOR VEHICLE WHEEL
Provided are: a sensor holder that can prevent influence on the performance of encoder reading by a sensor; and the like. A sensor holder 12 is provided with: a cap part 121 that is fitted into an outer ring 2 so as to cover an inner-side opening 2a of the outer ring 2; a sensor support part 122 that, at a portion of the cap part 121 opposing a magnetic encoder 11, protrudes from the cap part 121 toward one side in the axial direction, and supports a rotation speed sensor 13 for detecting displacement of the magnetic encoder 11; and a nut holding part 123 that protrudes from the cap part 121 toward the one side in the axial direction and holds a nut 124 for securing the rotation speed sensor 13 onto the cap part 121. The sensor support part 122 and the nut holding part 123 are formed separately, and one axial end surface 124a of the nut 124 held by the nut holding part 123 protrudes further toward the one side in the axial direction than one axial end surface 122c of the sensor support part 122.
A flexible boot for a constant velocity universal joint includes: attachment portions to a mating member at both ends; and a bent portion provided between the attachment portions and absorbing deformation caused by operation of a constant velocity universal joint. The flexible boot is made of a rubber material obtained by blending 50 to 80 parts by weight of HNBR having an acrylonitrile content of 15 to 21 wt % and 20 to 50 parts by weight of EPDM, the rubber material having an elastic recovery rate of 18% or more at −40° C. in a TR test.
Provided is a tapered roller bearing of an inner ring guidance design. A smaller diameter annular part of a cage and a smaller rib of an inner ring of the bearing defines a smaller diameter-side clearance S1. A larger diameter annular part of the cage and a larger rib of the inner ring defines a larger diameter-side clearance S2. The bearing defines a dimensionless number Y which is in the range of at least 0.39 to no more than 0.88 according to the following equation: Y=(Smax/S3)×(d/l)
where d and l are a mean roller diameter and a roller length of the tapered rollers, respectively, S3 corresponds to the equation: S3=(W/2)/tan θ−(PCD/2+(d/2)/sin θ−((D/2)2−(W/2)2)1/2), Smax is chosen from the maximum values of S1 and S2, W is a pocket width of the cage, θ is a pillar angle which is a half of the angle formed, in a section corresponding to the mean roller diameter d, by surfaces of adjacent pillars of the cage that make contact with a tapered roller located in between, PCD is the diameter of roller centers representing the pitch circle diameter of the arrangement of the tapered rollers, and D is a cage inner diameter.
F16C 19/36 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
A wheel bearing device for which the work of grinding a wheel hub is simplified. The wheel hub (3) has an inside track groove (3c), a seal land part (3d), a recess (3m), and a flange surface (3k). An outer-side sealing member (10) is provided with a core metal (11) and a sealing member (12). The sealing member includes a contact lip (12d) and a labyrinth lip (12e) facing the recess across a gap. The recess has a bottom (313) located between an outer diameter-side edge (311) and an inner diameter-side edge (312), and a tapered surface (314) that extends in the radial direction from the outer diameter-side edge toward the bottom and tilts toward one end of the axial direction going from the outer diameter-side edge toward the bottom.
In a parallel link mechanism, a distal end side link hub is coupled to a proximal end side link hub via three link mechanisms such that a posture of the distal end side link hub can be changed. Each link mechanism includes a proximal side end link member, a distal side end link member, and a center link member, and forms a quadric chain link mechanism composed of four revolute pairs. A singular point occurs when a central axis of the proximal or distal end side link hub and a central axis which is a rotation axis of a revolute pair section of the proximal or distal side end link member and the center link member coincide with each other. An axis angle of the center link member is specified such that a posture in which the singular point occurs is avoided.
In a tapered roller bearing in which a segment holder divided into a plurality of segments in a circumference direction is used in an inner ring assembly, which is incorporated into an outer ring, guide claws are provided on an outer-diameter side of adjacent columnar portions of each pocket of a holder to allow the tapered rollers to be inserted into the pockets from an inner-diameter side of the segments. An engaging portion is provided on a large-diameter-side lateral-surface of a large-diameter-side arc-shaped portion of the segment. A connecting member, which is to be wound around on a large-diameter side of the segments arranged in a ring shape, is made to pass through the engaging portion, and ends of the connecting member are removably connected together by a fastening member, so that adjacent segments are butted together and fixed.
F16C 19/36 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
An electrically-driven oil pump device includes a pump that circulates oil, a motor that drives the pump, a control unit that drives the motor on the basis of the received command rotational speed, a current detection unit that detects a motor current flowing through the motor, and a rotation sensor that detects the rotational speed of the motor. When the current detection unit detects a motor current greater than or equal to a set value that has been set in advance on the basis of the relationship of the motor current with respect to the pressure (hydraulic pressure) of the oil, the control unit outputs a response rotational speed corresponding to the command rotational speed instead of the actual rotational speed detected by the rotation sensor.
F04B 49/20 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by changing the driving speed
56.
CLAMPING RING AND BEARING UNIT COMPRISING THE RING
A clamping ring (6) includes: a ring main body (10) including a cut (13) formed in a part in a circumferential direction and a pair of circumferential-direction end portions (14a and 14b) opposed to each other across the cut (13); and bolt holes (11a and 11b) passing through the pair of circumferential-direction end portions (14a and 14b). The clamping ring (6) further includes a misalignment preventing part (16) configured to prevent misalignment of a center of gravity (CG) of the ring main body (10) from a center line (C1) of an inner peripheral surface (10a) of the ring main body (10).
A condition monitoring system includes a monitoring terminal, an acceleration sensor, and a data processor. The data processor calculates a diagnostic parameter from data measured by the acceleration sensor, determines a degree of damage to a bearing or a gear included in a wind turbine generator based on the diagnostic parameter, and controls the monitoring terminal to show information indicating a degree of suppression of electric power generated by the wind turbine generator in accordance with the degree of damage to the bearing or the gear.
In a parallel link mechanism, a distal end side link hub is coupled to a proximal end side link hub via three link mechanisms such that a posture of the distal end side link hub can be changed relative to the proximal end side link hub. Each link mechanism includes a proximal side end link member rotatably coupled at one end thereof to the proximal end side link hub, a distal side end link member rotatably coupled at one end thereof to the distal end side link hub, and a center link member rotatably coupled at both ends thereof to other ends of the proximal and distal side end link members via both revolute pair sections. The parallel link mechanism includes a rotation transmission mechanism configured to allow rotation of one revolute pair section to rotate the other revolute pair section in reverse.
A power generation system includes a wind power generation device, a control device, and a power supply target. In power generation system, control device performs power conversion to a power generated by wind power generation device, and supplies the converted power to a power supply target. Control device has a reference map for controlling a power conversion device of the control device. Reference map is a map indicating a relationship between an input voltage to the control device (power conversion device) and an output power from the control device (power conversion device). When a start condition is satisfied, control device executes correction control for correcting reference map, and searches for a point at which an output power of power generation system is maximized while shifting the output voltage of a generator by MPPT control. Control device corrects reference map on the basis of a result of the search.
A first seal and a second seal seal an annular space between an outer ring and an inner ring by sandwiching a retainer. A stator including a coil is supported by the first seal and is opposed to a magnetic ring. A sensor, a wireless communication circuit, and a power supply circuit are supported by the second seal. A wire electrically connects the coil and the power supply circuit. The wire includes a part disposed in a groove extending in an axial direction of a bearing on an outer peripheral surface of the outer ring.
A rolling bearing includes a plurality of balls and two raceway members. The balls and the raceway members have contact surfaces. In at least either of balls and raceway members, a superficial part is formed in a region from the contact surface to a depth of 20 μm. Of the balls and the raceway members, the member in which a superficial part is formed in the contact surface is made of steel that has been quenched. A raceway surface which is a contact surface of the raceway member is a partial arc in a sectional view that passes a central axis of the rolling bearing and is parallel with the central axis. The diameter of the partial arc is greater than or equal to 1.01 times and less than or equal to 1.08 times the diameter of the ball.
A power generation system includes a rotating body, a generator, a brake circuit, a voltage sensor, and a control device. When rotation speed of the rotating body exceeds a first threshold, the control device executes a brake operation by the brake circuit. When a release condition determined based on at least one of a value of a generated voltage detected by the voltage sensor and the rotation speed of the rotating body is satisfied after the rotation speed of the rotating body is lower than the first threshold, the control device stops the brake operation by the brake circuit.
A windmill includes a shaft, a blade, and a supporting member. The windmill is rotatable about a center axis of the shaft. The blade has a blade main body portion extending along an axial direction that is a direction of the center axis. When viewed in a cross sectional view orthogonal to the axial direction, the blade main body portion includes a front edge and a rear edge, the front edge being an end on a front side in a rotation direction of the windmill, the rear edge being an end on a rear side in the rotation direction. The supporting member extends along a radial direction orthogonal to the axis direction and passing through the center axis, so as to connect the shaft and the blade main body portion to each other.
In a tripod type constant velocity universal joint 1 of a double roller type, R/PCD≥0.0850 and t/PCD≥0.145, where PCD is a pitch circle diameter of a roller guide surface 6 of an outer joint member 2. R is a radius of curvature at an intermediate portion between a body portion 31 and a leg shaft 32 of a tripod member 3, and t is a minimum distance from a large-diameter portion 34a of a spline 34 of the tripod member 3 to an intermediate portion 33.
F16D 3/205 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
An outer joint member and a hub wheel are coupled to be able to transmit torque by meshing face splines respectively provided and applying a tightening force in an axial direction between both the face splines. Shapes of tooth surfaces of the face splines are determined such that, when bringing the face splines close to each other in the axial direction and meshing them with each other, tooth surfaces of the face splines first come into contact with each other in, among an outer diameter portion of a meshing region between both the face splines, an inner diameter portion, and an intermediate portion sandwiched between the outer diameter portion and the inner diameter portion, one of the outer and inner diameter portions, and then the tooth surfaces of both the face splines come into contact with each other in the other of the outer and inner diameter portions.
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
F16D 1/06 - Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
F16D 3/16 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
66.
CELL TISSUE PRODUCTION METHOD, CELL TISSUE PRODUCTION SET, AND CULTIVATION CONTAINER CONTAINING CELL TISSUE PRODUCED BY SAID PRODUCTION METHOD
This cellular tissue production method can produce a cellular tissue with high density and high shape retainability while the cell viability is maintained, and includes: a first application step of applying a first application liquid to an application target; and a second application step of applying and layering a second application liquid onto the first application liquid applied in the first application step, wherein the second application step includes subjecting an interface between the first application liquid and the second application liquid to gelation while the first application liquid is kept fluid.
fitting a boot 20 to an outer periphery of an outer joint member 2, causing a boot band 100 to circle around an outer periphery of the boot 20, and fastening the boot 20 by reducing a diameter of the boot band 100 are included. A portion (lug portion 111) of the boot band 100 to which a pressing force in an inner diameter direction is applied when the diameter of the boot band 100 is reduced is arranged in a circumferential region R of a thin portion 21S of the boot 20.
F16D 3/84 - Shrouds, e.g. casings, coversSealing means specially adapted therefor
F16B 2/08 - Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action using bands
F16D 3/205 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
In a wheel bearing device, an axial end surface of a hub 1 of a wheel bearing 6 and an axial end surface of an outer joint member 20 of a constant velocity universal joint 7 are coupled by a recess-and-protrusion fitting structure (face spline structure X) in a torque transmittable manner. An inner peripheral surface of the hub 1 of the wheel bearing 6 and an outer peripheral surface of the outer joint member 20 of the constant velocity universal joint 7 are fitted to each other.
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
An outer joint member 31 and a hub wheel 16 are coupled so as to be able to transmit torque by meshing face splines 51 and 52 respectively provided and applying a tightening force in an axial direction between both the face splines 51 and 52. Shapes of tooth surfaces of both the face splines 51 and 52 are determined such that, in a process of bringing both the face splines 51 and 52 close to each other in the axial direction and meshing with each other, tooth surfaces 51a and 51b of both the face splines 51 and 52 first come into contact with each other in, among an outer diameter portion Ea of a meshing region X between both the face splines, an inner diameter portion Ec, and an intermediate portion Eb sandwiched between the outer diameter portion and the inner diameter portion, the intermediate portion Eb.
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
F16D 1/02 - Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
F16D 3/16 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
A cage is provided which is less likely to be deformed by a centrifugal force, and in which the strength of a weld is less likely to decrease. Each horn portion includes a base wall axially connected to a ring portion, and located between pockets, and a pair of claws separated from each other. The pair of claws each has a pocket inner surface facing the pocket, and an opposed surface on the side opposite from the pocket inner surface. The base wall includes a pair of connection portions axially connecting the respective claws to the ring portion, and an intermediate portion circumferentially connecting the connection portions to each other. A weld is disposed in a resin area consisting of one of the claws, one of the connection portions, and a circumferential section of the ring portion.
a. An axial dimension L is 4.8 nm or less, a thickness dimension t is 0.5 mm or more and 1.5 nm or less, and a ratio L/D2 of the axial dimension L to an outer diameter dimension D2 is 0.24 or more and 0.6 or less.
To provide a piston ring having superior wear resistance and causing less wear damage of a cylinder. A piston ring 1 is used in a reciprocating compressor that compresses gas. The piston ring 1 is formed of a resin composition containing polyetheretherketone resin as a main component. The melt viscosity of the polyetheretherketone resin at the shear rate of 1,000/s and the temperature of 400° C. is 200-550 Pa·s based on a measuring method defined in ISO 11443. The resin composition contains 5-25 vol % of carbon fiber and 5-25 vol % of a solid lubricant, relative to the whole of the resin composition. The solid lubricant includes at least one of PTFE resin and graphite.
F16J 9/26 - Piston-rings, seats thereforRing sealings of similar construction in general characterised by the use of particular materials
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F16J 9/28 - Piston-rings, seats thereforRing sealings of similar construction in general characterised by the use of particular materials of non-metals
73.
VIBRATION ANALYSIS APPARATUS AND VIBRATION ANALYSIS SYSTEM
A vibration analysis apparatus diagnoses a machine state based on vibration detected by a measurement instrument. A setting unit sets a diagnosis target, a rotation speed, and a determination criterion value. A communication unit communicates with the measurement instrument to transmit a trigger to start measurement of vibration to the measurement instrument or to receive data on a vibration waveform from the measurement instrument. A condition determination unit determines a diagnosis condition based on information on the diagnosis target. An analyzer subjects data inputted from the measurement instrument to frequency analysis. An abnormality determination unit makes determination as to an abnormality of the diagnosis target based on the determination criterion value. Thus, the vibration analysis apparatus and a vibration analysis system capable of vibration analysis with certain accuracy being maintained regardless a skill level of a user can be provided.
A clutch unit includes an operation lever, an operation member, an input-side clutch, an output-side clutch, and a bottomed cylindrical housing. The input-side clutch includes an input-side inner ring member and an operation bracket. The operation bracket includes an engagement portion that engages with the input-side inner ring member, a facing portion that faces the bottom surface of the housing with a gap therebetween, a fastened portion that penetrates a through hole formed in the bottom surface of the housing and is fastened to the operation member, and a sliding-contact portion that extends from the facing portion toward the bottom surface of the housing and comes into sliding-contact with the bottom surface of the housing.
F16D 41/063 - Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by moving along the inner and the outer surface without pivoting or rolling, e.g. sliding wedges
B60N 2/16 - Seats specially adapted for vehiclesArrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
F16D 41/08 - Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action
75.
Axle bearing, grease composition and rolling ball bearing
−1 at 25° C. is 3,000 Pa or less. The viscosity of the grease composition is 1 Pas or less. The yield stress of the grease composition at 25° C. measured by a dynamic viscoelasticity analysis method using a rheometer is 1,300-3,000 Pa.
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
C10M 107/02 - Hydrocarbon polymersHydrocarbon polymers modified by oxidation
C10M 115/08 - Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
C10M 169/00 - Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
C10M 169/02 - Mixtures of base-materials and thickeners
C10M 169/04 - Mixtures of base-materials and additives
F16C 33/66 - Special parts or details in view of lubrication
An application mechanism applies a liquid material on an application surface. The application mechanism includes: an application needle holder fixing unit; an application needle holder detachably attached to the application needle holder fixing unit; an application needle held at the application needle holder; and a cushioning mechanism. The cushioning mechanism is capable of cushioning an impact when the application needle is brought into contact with the application surface.
B05C 1/02 - Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to separate articles
An insulated bearing device includes a housing, an outer ring and rolling elements, and an insulating film for providing electrical insulation between the housing and the outer ring is disposed on the surface of the outer ring. The insulating film includes a straight portion extending along the outer periphery of the outer ring and having a constant outer diameter in the axial direction. The housing has, on the inner periphery of its housing hole, an inner peripheral cylindrical surface formed at a position intersecting with the axial centerlines of the rolling elements, and the straight portion is fitted to, and in contact with, the inner peripheral cylindrical surface. The contact range (area of contact) between the inner peripheral cylindrical surface and the straight portion has an axial length shorter than the entire axial length of the straight portion.
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
F16C 19/52 - Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
F16C 35/077 - Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
78.
Plunging type constant velocity universal joint for propeller shaft
F16D 3/224 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines of each coupling part lying on a sphere
F16D 3/2245 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines of each coupling part lying on a sphere where the groove centres are offset from the joint centre
F16D 3/227 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines of each coupling part lying on a cylinder co-axial with the respective coupling part the joints being telescopic
F16D 3/223 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
a that is a fitting surface with the housing 10. The surface coating film 8 contains: a binder containing two or more kinds of thermosetting resins having different average molecular weights; and a solid lubricant. The solid lubricant contains molybdenum disulfide, polytetrafluoroethylene resin, and graphite.
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
A bearing part (10) is composed of a steel, and has a quench-hardened layer (11) in a surface of the bearing part. The quench-hardened layer includes a plurality of martensite crystal grains. The plurality of martensite crystal grains are classified into a first group and a second group. A minimum value of crystal grain sizes of the martensite crystal grains belonging to the first group is larger than a maximum value of crystal grain sizes of the martensite crystal grains belonging to the second group. A value obtained by dividing a total area of the martensite crystal grains belonging to the first group by the total area of the plurality of martensite crystal grains is more than or equal to 0.3. A value obtained by dividing, by the total area of the plurality of martensite crystal grains, a total area of the martensite crystal grains belonging to the first group except for a martensite crystal grain that has a minimum crystal grain size and that belongs to the first group is less than 0.3. An average grain size of the martensite crystal grains belonging to the first group is less than or equal to 1.5 μm. The quench-hardened layer (11) further includes a plurality of cementite grains. A number density of cementite grains each having a grain size of more than or equal to 1 μm is more than or equal to 0.025/μm2.
F16C 19/06 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row of balls
C21D 9/40 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for ringsHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for bearing races
C21D 1/18 - HardeningQuenching with or without subsequent tempering
C21D 1/74 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
A spindle device includes: a rotation shaft; a bearing housing having a cylindrical shape extending in a direction of a center axis of the rotation shaft; a bearing attached to an inner peripheral surface of the bearing housing and rotatably supporting the rotation shaft; and a first elastic member. A first flow path and a second flow path are formed inside the bearing housing, each of the first flow path and the second flow path extending in a direction of a center axis of the bearing housing. A first groove is formed in an outer peripheral surface of the bearing housing, the first groove extending in a peripheral direction of the bearing housing, the first groove being connected to the first flow path and the second flow path. The first elastic member closes an opening of the first groove.
Provided is a roller bearing which includes rollers (4, 5) interposed between raceway surfaces of inner and outer rings (2, 3) and having a roller outer circumferential surface, and a DLC film on the roller outer circumferential surface. The DLC film includes a metal layer, an intermediate layer containing the metal and DLC, and a superficial layer containing DLC, in the stated order starting from a side adjacent to a substrate of the rollers (4, 5). The intermediate layer has a bilayered structure of a top layer and a bottom layer. The top layer is a DLC-enriched layer having a greater content of DLC than the bottom layer. The bottom layer is a metal-enriched layer having a greater content of the metal than the top layer. The metal-enriched layer has a layer thickness of between at least 100 nm and no more than 300 nm.
The condition monitoring system is for monitoring the conditions of a piece of equipment and includes: a sensor configured to be installed to the piece of equipment; a data instrumentation unit configured to receive a sensing signal from the sensor to acquire instrumentation data from the sensing signal under a predefined instrumentation condition; and a data diagnosis unit configured to receive the instrumentation data from the data instrumentation unit and use the instrumentation data to perform a diagnosis process to diagnose the conditions of the piece of equipment. The data diagnosis unit includes an edge application and an industrial IoT platform. The edge application includes a data collection and analysis module, and the data collection and analysis module is configured to calculate a feature for the instrumentation data from the data instrumentation unit and broadcast the feature to the industrial IoT platform.
A cage is asymmetrical to a radially extending straight line extending. Supposing that α is the angle of contact of the rolling element, α is defined as 30°≤α≤45°. The relationship defined in the numerical expression is satisfied, where D is the outer diameter of the outer ring, d is the inner diameter of the inner ring, and Da is the diameter of the rolling element. With center axes of the whole bearing in an axial direction and of the cage in the axial direction overlapping each other, at least one of the following relationships is satisfied;
A cage is asymmetrical to a radially extending straight line extending. Supposing that α is the angle of contact of the rolling element, α is defined as 30°≤α≤45°. The relationship defined in the numerical expression is satisfied, where D is the outer diameter of the outer ring, d is the inner diameter of the inner ring, and Da is the diameter of the rolling element. With center axes of the whole bearing in an axial direction and of the cage in the axial direction overlapping each other, at least one of the following relationships is satisfied;
A/Da≤0.020 (2), and
A cage is asymmetrical to a radially extending straight line extending. Supposing that α is the angle of contact of the rolling element, α is defined as 30°≤α≤45°. The relationship defined in the numerical expression is satisfied, where D is the outer diameter of the outer ring, d is the inner diameter of the inner ring, and Da is the diameter of the rolling element. With center axes of the whole bearing in an axial direction and of the cage in the axial direction overlapping each other, at least one of the following relationships is satisfied;
A/Da≤0.020 (2), and
2A/PCD≤0.010 (3),
A cage is asymmetrical to a radially extending straight line extending. Supposing that α is the angle of contact of the rolling element, α is defined as 30°≤α≤45°. The relationship defined in the numerical expression is satisfied, where D is the outer diameter of the outer ring, d is the inner diameter of the inner ring, and Da is the diameter of the rolling element. With center axes of the whole bearing in an axial direction and of the cage in the axial direction overlapping each other, at least one of the following relationships is satisfied;
A/Da≤0.020 (2), and
2A/PCD≤0.010 (3),
where A is the smallest dimension value of a clearance in a radial direction between surfaces of a pocket of the cage facing the rolling element and of this rolling element, and PCD is the pitch diameter of each rolling element.
F16C 19/16 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
NATIONAL UNIVERSITY CORPORATION HAMAMATSU UNIVERSITY SCHOOL OF MEDICINE (Japan)
NTN Corporation (Japan)
Inventor
Hariyama, Takahiko
Kawasaki, Hideya
Ohba, Hiroaki
Abstract
An immunochromatography assay kit includes a specimen dropping portion to which a specimen is dropped, a conjugate portion to which a labeled antibody having a property of binding to a detection target in the specimen is immobilized, and a plurality of detection portions to which a capture antibody having a property of binding to the detection target is immobilized. The specimen dropping portion, the conjugate portion, and the plurality of detection portions are formed on a porous member. An outer shape of each detection portion is a dot shape.
A bearing apparatus includes a housing where a main spindle is accommodated, a bearing including an inner ring and an outer ring, the bearing supporting the main spindle rotatably with respect to the housing, a retaining lid fitted to an inside surface of the housing while the retaining lid is in contact with an axial end surface of the housing and an axial end surface of the outer ring, and a communication module arranged in a region opposed to the retaining lid with the bearing being interposed, the communication module wirelessly communicating over electromagnetic waves. In a portion of the retaining lid in contact with the housing, a non-metallic layer composed of ceramic which is a non-metallic material is provided.
A rolling member is formed of quenched steel having a contact surface. The rolling member includes a superficial part in a region up to a depth of 20 μm from the contact surface. Steel contains greater than or equal to 0.70 mass % and less than or equal to 1.10 mass % of carbon, greater than or equal to 0.15 mass % and less than or equal to 0.35 mass % of silicon, greater than or equal to 0.30 mass % and less than or equal to 0.60 mass % of manganese, greater than or equal to 1.30 mass % and less than or equal to 1.60 mass % of chromium, greater than or equal to 0.01 mass % and less than or equal to 0.50 mass % of molybdenum, and greater than or equal to 0.01 mass % and less than or equal to 0.50 mass % of vanadium, and the remainder of iron and inevitable impurities.
C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C21D 9/40 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for ringsHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for bearing races
An electric oil pump 1 includes: a pump unit 2 that generates hydraulic pressure; a motor unit 3 that drives the pump unit; a substrate 4 on which a control circuit for controlling the motor unit 3 is formed by a plurality of electronic components 41; and a housing 5 equipped with a pump accommodation unit 53 that houses the pump unit, a motor accommodation unit 54 that houses the motor unit, and a substrate accommodation unit 55 that houses the substrate. The substrate 4 is disposed along the tangential direction of a circle about the axis of the motor unit 3. The pump accommodation unit 53, the motor accommodation unit 54, and the substrate accommodation unit 55 are integrally formed.
A diagnosis-parameter calculation unit calculates a diagnosis parameter in a second time period, based on sensing data obtained in the second time period. A characteristic-data input unit obtains characteristic data representing characteristics of a monitoring target device in a first time period and the second time period, from a logger included in the monitoring target device. Using the characteristic data in the second time period and the diagnosis parameter in the second time period, a regression-model generation unit) generates a regression model representing a relationship between the characteristic data and the diagnosis parameter. Using the regression model, a diagnosis-parameter estimation unit estimates a diagnosis parameter in the first time period, which corresponds to the characteristic data in the first time period. Using the diagnosis parameters in the first time period and the second time period, the diagnosis-criteria setting unit sets diagnosis criteria.
Provided is a steering system which includes a hub unit with a steering function and a control device. A steering actuator includes a motor and a linear drive mechanism configured to convert a rotational output from the motor to a linear motion. An angle sensor is configured to sense a rotational angle of the motor and capable of generating two or more angle sensor values. A position sensor is configured to sense a position of the linear drive mechanism which represents an amount of displacement of an output rod and capable of outputting the same in the form of a position sensor value. The control device is configured to compare each of the angle sensor values sensed and generated by the angle sensor against the position sensor value sensed by and output from the position sensor to determine whether any one of the angle sensor values is incorrect.
A condition monitoring system includes a data measurement device, a data analyzer, and a diagnosis device. The data measurement device obtains, according to a measurement condition provided, measurement data from a detection signal of a sensor. The data analyzer performs an analysis process on the measurement data obtained by the data measurement device. The diagnosis device performs a diagnosis process of diagnosing a condition of a facility based on an analysis result obtained through the analysis process. The data analyzer sets the measurement condition and an analysis condition for the analysis process based on a time required for the analysis process and the diagnosis process.
Bearing cap for bearing device for vehicle wheel with rotational speed detection device, and bearing device for vehicle wheel with rotational speed detection device
In a bearing cap in which a sensor support part is formed on a bottom surface section of a cap body and in which an insertion hole for a rotational speed sensor is formed in the sensor support part, a recess that accommodates a tip portion of the rotational speed sensor is formed in the portion of the bottom surface section where the sensor support part is formed. The sensor support part includes a first wall section and a second wall section that are disposed, facing each other across a virtual line L passing through a center axis G1 of the bottom surface section and a center axis G2 of the insertion hole, and that are formed along the circumferential edge of the recess. Protrusions protruding from the bottom surface section are continuously provided on the outer circumferential surfaces of the first wall section and the second wall section.
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
A one-way clutch includes a C-shaped spring having one end thereof engaged by the inner ring and the other end abutting a roller at one end of a row of rollers that abut each other, thereby engaging the rollers with the outer ring and the inner ring. The inner ring has a radius at the engaging end of the cam surface opposed to the roller at the other end of the row of the rollers larger than its radii at the engaging ends of the cam surfaces opposed to the other rollers of the same row.
F16D 41/067 - Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical and the members being distributed by a separate cage encircling the axis of rotation
F16D 41/06 - Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
95.
Assembling method and assembling device for hub bearing
To obtain a second assembly, first, an outer ring and first roller cassette of a first assembly are supported by a first support tool and a hub wheel of the first assembly is supported by a second support tool, and then the second support tool is moved upward, so that a roller support surface of the second support tool is introduced to the inside of the first roller cassette in the radial direction. Then, after a first seal member is attached to the outer ring, the second support tool is moved downward in accordance with the re-insertion of a cylindrical portion of the hub wheel into the inner periphery of the outer ring, so that a first inner raceway surface is inside of the first roller cassette in the radial direction while the roller support surface is ejected to the lower side of the first roller cassette.
F16C 43/06 - Placing rolling bodies in cages or bearings
F16C 19/38 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
A magnetic core material contains an Fe-based soft magnetic powder in which an inorganic insulating film 4b is formed on a surface of an Fe-based soft magnetic particle 4a, and an epoxy resin 4c containing a curing agent. The Fe-based soft magnetic particle 4a is formed of a pure iron powder or a low-alloy steel powder. A content of the epoxy resin containing the curing agent is 2 to 5 mass %. The epoxy resin is a mixture of a bisphenol A-type epoxy resin and a novolac-type epoxy resin.
H01F 1/26 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
To provide a grease-sealed bearing that is superior in fretting wear resistance and sealing performance when used under an oscillation condition with acceleration and deceleration such as a condition used in a robot joint. A grease-sealed bearing 1 includes an inner ring 2 and an outer ring 3 that are raceway rings, a plurality of rolling elements 4 interposed between the inner ring 2 and the outer ring 3, and a grease composition 7 sealed around the rolling elements 4. The bearing oscillates such that a bearing rotational direction changes while accelerating and decelerating. The grease composition contains a base oil and a thickener. The worked penetration of the grease composition is 310 or more. The thickener is a calcium sulfonate complex soap.
F16C 33/66 - Special parts or details in view of lubrication
C10M 115/10 - Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing sulfur
C10M 169/02 - Mixtures of base-materials and thickeners
F16C 33/78 - Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
C10N 50/10 - Form in which the lubricant is applied to the material being lubricated semi-solidForm in which the lubricant is applied to the material being lubricated greasy
A bearing apparatus includes a bearing that rotatably supports a main spindle around a rotation axis, a spacer including an inner-ring spacer adjacent to an inner ring of the bearing and an outer-ring spacer adjacent to an outer ring, and a heat flux sensor provided in an inside surface of the outer-ring spacer. A distance in a direction along the rotation axis from a center of the bearing to a center of the heat flux sensor is longer than 0.5 time and shorter than one time of a dimension of the bearing in the direction along the rotation axis.
F16C 19/16 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
B23Q 1/70 - Stationary or movable members for carrying working-spindles for attachment of tools or work
B23Q 11/12 - Arrangements for cooling or lubricating parts of the machine
F16C 19/52 - Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
F16C 19/54 - Systems consisting of a plurality of bearings with rolling friction
F16C 33/66 - Special parts or details in view of lubrication
B60N 2/16 - Seats specially adapted for vehiclesArrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
100.
SILICON NITRIDE SINTERED BODY, ROLLING ELEMENT USING THE SAME, AND BEARING
To provide: a silicon nitride sintered body having excellent mechanical property, in particular fracture toughness, and having long lifetime of a product into which the silicon nitride sintered body is processed; a rolling element using the silicon nitride sintered body; and a bearing. The silicon nitride sintered body contains a rare earth element and an aluminum element. The silicon nitride sintered body contains 6-13 wt % of the rare earth element in terms of oxide, and 6-13 wt % of the aluminum element in terms of oxide, relative to the total weight of the silicon nitride sintered body. The silicon nitride sintered body contains an inclusion (I) in a surface layer portion that is a region within 2 mm from a surface of the silicon nitride sintered body. A ratio of a total sectional area of the inclusion (I) to a total sectional area of the surface layer portion is 0.05% or more.
C04B 35/584 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on borides, nitrides or silicides based on silicon nitride
C04B 38/00 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof
patents
