An electric wheel-end assembly comprising a mounting portion, a spindle having an inboard end connected to the mounting portion and an outboard end distal from the mounting portion. A hub is rotatably mounted to the spindle via one or more bearings disposed between the inboard and outboard ends of the spindle. A reduction gearbox is disposed at the distal end of the spindle. An input shaft comprising an inboard end having a drive receiving portion arranged to releasably connect to a drive shaft of an electric motor, extends through the spindle to deliver a rotational input to the drive input of the reduction gearbox, the drive output of the reduction gearbox being connected to the hub to drive the hub in rotation about the spindle.
B60K 17/04 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission
B60K 7/00 - Disposition du moteur dans ou jouxtant une roue motrice
F16H 1/28 - Transmissions à engrenages pour transmettre un mouvement rotatif avec engrenages à mouvement orbital
An axle assembly for a vehicle. A movable housing is movably positioned within a closed channel defined by a central housing. The movable housing moves the axle assembly between a retracted configuration and an extended configuration. A mounting assembly may be coupled to and spaced from the movable housing and slidably positioned adjacent the central housing. A steering actuator is coupled to a steering arm and the mounting assembly such that the steering actuator moves as a unit. A track assist bracket may be fixedly coupled to the central housing and define a gap sized to slidably receive a mounting plate of the mounting assembly. A bushing may be disposed on each wall of a telescoping portion of the movable housing. A bellows may be provided to enclose exposed portions of the bushings in the extended configuration. Methods of adjusting the track of the axle assembly are also disclosed.
An axle assembly for frame rail vehicles is described herein. The axle assembly also includes a drive unit housing that includes an interior cavity enclosing first and second electric machines, a common gear reduction, a differential gear set, and a speed change mechanism with the first and second axle shafts partially disposed within the interior cavity and extending out of the drive unit housing. The drive unit housing includes a central cavity, a lower cavity, a first machine cavity, and a second machine cavity. The central cavity includes the common gear reduction and the axis of rotation of the first and second axle shafts. The lower cavity accumulates a volume of gearbox fluid with the speed change mechanism at least partially immersed in the lower cavity. The first machine cavity includes the first electric machine and the second machine cavity includes the second electric machine.
B60K 1/00 - Agencement ou montage des ensembles de propulsion électriques
B60K 1/02 - Agencement ou montage des ensembles de propulsion électriques comprenant plus d'un moteur électrique
B60K 17/04 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission
B60K 17/22 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type d'arbre principal d'entraînement, p. ex. arbre à cardan
B60K 7/00 - Disposition du moteur dans ou jouxtant une roue motrice
An axle assembly for frame rail vehicles is described herein. The axle assembly includes a first axle shaft and a second axle shaft orientated along a first axis of rotation. A first electric machine is orientated along a second axis of rotation and a second electric machine is spaced from the first electric machine and orientated along a third axis of rotation. A differential gear set is disposed about the first axis of rotation and is coupled to and driven by a common gear reduction to transfer rotational torque from the first and second electric machines to the first and second axle shafts. A speed change mechanism is coupled between the common gear reduction and the differential gear set to change the rotational torque transferred to the first and second axle shafts.
B60K 1/00 - Agencement ou montage des ensembles de propulsion électriques
B60K 1/02 - Agencement ou montage des ensembles de propulsion électriques comprenant plus d'un moteur électrique
B60K 17/04 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission
B60K 17/22 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type d'arbre principal d'entraînement, p. ex. arbre à cardan
B60K 7/00 - Disposition du moteur dans ou jouxtant une roue motrice
Vehicles that are relatively heavy and/or configured to transport heavy loads may utilize a powertrain comprising an electric machine capable of operating at high speeds and a multispeed transmission to propel the vehicle. An interface module is configured to modulate torque between the electric machine and the multispeed transmission allowing the electric machine to smoothly match speed as the multispeed transmission shifts between gears. The interface module facilitates efficient, predictable, and reliable modulation of torque between an input and an output of the powertrain of the vehicle.
F16F 15/12 - Suppression des vibrations dans les systèmes rotatifs par utilisation d'organes mobiles avec le système lui-même utilisant des organes élastiques ou des organes amortisseurs de friction, p. ex. entre un arbre en rotation et une masse giratoire montée dessus
An axle assembly for frame rail vehicles is described herein. The axle assembly includes a drive unit that includes a first drive unit assembly, a second drive unit assembly, a first axle shaft, and a second axle shaft. The first drive unit assembly includes a first electric machine, a first output assembly, and a first offset gear reduction assembly. The second drive unit assembly includes a second electric machine, a second output assembly, and a second offset gear reduction assembly. The first electric machine and the second electric machine are orientated in a same direction, and spaced such that the axle centerline axis is positioned between the first electric machine and the second electric machine. The first offset gear reduction assembly is spaced from the second offset gear reduction assembly such that the axle centerline axis is positioned between the first offset gear reduction and the second offset gear reduction.
B60K 7/00 - Disposition du moteur dans ou jouxtant une roue motrice
B60K 1/02 - Agencement ou montage des ensembles de propulsion électriques comprenant plus d'un moteur électrique
B60K 1/00 - Agencement ou montage des ensembles de propulsion électriques
B60K 17/04 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission
B60K 17/22 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type d'arbre principal d'entraînement, p. ex. arbre à cardan
A tool tray includes a body having an upper surface for holding at least one tool, a lower surface opposite the upper surface, a first side defining a first axis, a second side adjacent the first side and defining a second axis transverse to and intersecting the first axis. The tool tray further includes a first bracket attached to and extending from the lower surface of the body and having a first bracket length parallel to the first axis with the first bracket adapted to couple to an underlying support, and a second bracket attached to and extending from the lower surface of the body and having a second bracket length parallel to the second axis transverse to and intersecting the first axis with the second bracket adapted to couple to the underlying support.
An axle assembly for a vehicle. A movable housing is movably positioned within a closed channel defined by a central housing. The movable housing moves the axle assembly between a retracted configuration and an extended configuration. A mounting assembly may be coupled to and spaced from the movable housing and slidably positioned adjacent the central housing. A steering actuator is coupled to a steering arm and the mounting assembly such that the steering actuator moves as a unit. A track assist bracket may be fixedly coupled to the central housing and define a gap sized to slidably receive a mounting plate of the mounting assembly. A bushing may be disposed on each wall of a telescoping portion of the movable housing. A bellows may be provided to enclose exposed portions of the bushings in the extended configuration. Methods of adjusting the track of the axle assembly are also disclosed.
An axle assembly for a low floor vehicle is described herein. The axle assembly includes an axle housing and a drive unit for driving a wheel assembly. The drive unit includes an axle shaft, a wheel end assembly, an electric machine, and a transmission unit. The axle shaft extends along an axle centerline axis between a first axle end and a second axle end. The wheel end assembly is coupled to the first axle end. The electric machine is positioned within the axle housing and includes a rotor shaft, a drive pinion coupled to the rotor shaft, and an electric motor for rotating the rotor shaft. The rotor shaft extends along a rotor shaft centerline axis that is orientated parallel to the axle centerline axis. The transmission unit is positioned within the axle housing and is configured to transfer torque from the electric machine to the axle shaft.
B60K 1/02 - Agencement ou montage des ensembles de propulsion électriques comprenant plus d'un moteur électrique
B60K 1/00 - Agencement ou montage des ensembles de propulsion électriques
B60K 17/04 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission
B60K 17/22 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type d'arbre principal d'entraînement, p. ex. arbre à cardan
B60L 11/00 - Propulsion électrique par source d’énergie intérieure au véhicule (B60L 8/00, B60L 13/00 ont priorité;agencements ou montage de moteurs primaires constitués de moteurs électriques et de moteurs à combustion interne pour une propulsion réciproque ou commune B60K 6/20)
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
independent suspension axle systems for land vehicles and component parts for land vehicle independent suspension axle systems, namely, axles, carriers, control arms, ball joints, wheel ends, ball joints with control arms, bushing kits, tie rods, sleeves, idler arms, center links, stabilizer kits, inner sockets, pitman arms, springs, knuckles, connecting rods, electric motors.
A driven steerable suspension system is mounted to each of a vehicle frame and a pair of wheels of a vehicle. The system includes a subframe including first and second flanks for mounting along the vehicle frame. The system includes first and second suspension assemblies coupled to the first and second flanks, respectively. Each of the assemblies include a lower control arm extending between lower inboard and outboard joints, and an upper control arm extending between upper inboard and outboard joints. Each of the assemblies include a steering knuckle pivotally coupled to the lower outboard joint and the upper outboard joints. Each of the assemblies include a wheel hub rotatably coupled to the steering knuckle. Each of the assemblies include a dampened biasing member pivotally mounted to the subframe and the lower control arm. Each of the assemblies include a drive axle rotatably coupled with the wheel hub.
B60K 17/30 - Agencement ou montage des transmissions sur les véhicules les éléments propulsifs terminaux, p. ex. les roues, étant orientables
B60G 3/18 - Suspensions élastiques pour une seule roue avec plusieurs bras articulés, p. ex. parallélogramme
B60G 7/00 - Bras de suspension articulésLeurs accessoires
B60G 7/04 - Dispositifs de butée pour limiter le mouvement des bras
B60G 11/00 - Suspensions élastiques caractérisées par la disposition, l'emplacement ou le type des ressorts
B60G 11/14 - Suspensions élastiques caractérisées par la disposition, l'emplacement ou le type des ressorts ayant des ressorts hélicoïdaux, spirales ou en bobines uniquement
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
Automotive and industrial machine parts, namely, drive gears such as bevel gears, ring gears, and pinion gears Land vehicle parts, namely, drive gears such as bevel gears, ring gears, and pinion gears
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
Independent suspension axle systems for land vehicles and component parts for land vehicle independent suspension axle systems, namely, axles, carriers, control arms, ball joints, wheel ends, ball joints with control arms, bushing kits, tie rods, sleeves, idler arms, center links, stabilizer kits, inner sockets, pitman arms, springs, knuckles, connecting rods, electric motors
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
(1) Cam shafts; Vehicle brake kits comprised primarily of cam shafts, sold as a unit.
(2) Land vehicle parts, namely, axles and parts thereof, suspension systems for land vehicles, brakes, brake chambers, brake linings, brake drums, brake shoes and blocks, brake return springs, brake rollers, brake anchor pins, brake rotors and brake slack adjusters; structural parts for land vehicles, namely, transfer cases used for land vehicle drivetrains, splined drive shafts for land vehicles, wheel ends used for land vehicle drivetrains, propeller shafts for land vehicles; land vehicle drive train components, namely, drive gears, drive shafts for land vehicles, bearings, namely, axle bearings for land vehicles, roller bearings for land vehicles, and wheel bearings for land vehicles, mechanical seals for land vehicles drivetrain, constant velocity joints being part of drive shafts for land vehicles and vehicle suspension components, namely, ball joints, upper ball joints, lower ball joints, ball joints with control arms, bushing kits, tie rods, inner tie rod ends, outer tie rod ends, sleeves, idler arms, center links, stabilizer kits, inner sockets, pitman arms, springs, knuckles, steering knuckles, connecting rods; vehicle brake kits comprised primarily of brake chambers, brake linings, brake drums, brake shoes and blocks, brake return springs, brake rollers, brake anchor pins, brake rotors, and brake slack adjusters sold as a unit.
An axle assembly (200) includes a first axle housing (102), a second axle housing (104), a first wheel end (216), a second wheel end (218), and at least one drive shaft (150) extending through the first axle housing (102) and the second axle housing (104) and coupled to the first and second wheel ends (216, 218). The axle assembly (200) also includes a gearbox (210) having a body (240) with first and second portions (242, 244) defining a cavity (246) with the first axle housing (102) coupled to the first portion (242) and the second axle housing (104) coupled to the second portion (244). The axle housing (200) further includes an electric motor (122) coupled to the first portion (242) of the body (240). The gearbox (210) includes a gear train (153) having an input shaft (160) having one end coupled to the electric motor (122) and an output shaft (172) rotatably coupled to the input shaft (160), The gear train (153) further includes a clutch (174) having a shifting fork (178) movable between an engaged state and a disengaged state to couple the output shaft (172) to the drive shaft (150) such that the electric motor (122) drives the drive shaft (150) and to uncouple the output shaft (172) from the drive shaft (150) such that the drive shaft (150) is able to rotate independently from the electric motor (122).
B60K 1/00 - Agencement ou montage des ensembles de propulsion électriques
B60K 6/20 - Agencement ou montage de plusieurs moteurs primaires différents pour une propulsion réciproque ou commune, p. ex. systèmes de propulsion hybrides comportant des moteurs électriques et des moteurs à combustion interne les moteurs primaires étant constitués de moteurs électriques et de moteurs à combustion interne, p. ex. des VEH
B60K 6/42 - Agencement ou montage de plusieurs moteurs primaires différents pour une propulsion réciproque ou commune, p. ex. systèmes de propulsion hybrides comportant des moteurs électriques et des moteurs à combustion interne les moteurs primaires étant constitués de moteurs électriques et de moteurs à combustion interne, p. ex. des VEH caractérisés par l'architecture du véhicule électrique hybride
B60K 6/48 - Agencement ou montage de plusieurs moteurs primaires différents pour une propulsion réciproque ou commune, p. ex. systèmes de propulsion hybrides comportant des moteurs électriques et des moteurs à combustion interne les moteurs primaires étant constitués de moteurs électriques et de moteurs à combustion interne, p. ex. des VEH caractérisés par l'architecture du véhicule électrique hybride du type parallèle
B60K 17/04 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission
B60K 17/16 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission du différentiel
Axle assembly includes first and second axle housings extending toward opposing sides of a vehicle frame with the axle housings aligned to define an axle axis, first and second wheel ends, first and second drive shafts disposed within the first and second axle housings, a gearbox having a first surface facing one side of the vehicle frame and a second surface facing the other side of the vehicle frame with the gearbox cantilevered outwardly relative to the aligned axle housings to define a gearbox axis parallel to a longitudinal axis of the vehicle frame and transverse to the axle axis, and an electric motor coupled to the second surface of the gearbox and extending toward the first side of the vehicle frame to define a motor axis that is parallel to and offset from the axle axis, transverse to the gearbox axis, and transverse to the longitudinal axis.
B60K 1/00 - Agencement ou montage des ensembles de propulsion électriques
B60K 6/40 - Agencement ou montage de plusieurs moteurs primaires différents pour une propulsion réciproque ou commune, p. ex. systèmes de propulsion hybrides comportant des moteurs électriques et des moteurs à combustion interne les moteurs primaires étant constitués de moteurs électriques et de moteurs à combustion interne, p. ex. des VEH caractérisés par des appareils, des organes ou des moyens spécialement adaptés aux VEH caractérisés par l'assemblage ou la disposition relative des organes
B60K 17/04 - Agencement ou montage des transmissions sur les véhicules caractérisées par la disposition, l'emplacement ou le type de mécanisme de transmission
B60K 7/00 - Disposition du moteur dans ou jouxtant une roue motrice
B60K 17/356 - Agencement ou montage des transmissions sur les véhicules pour entraînement simultané des roues avant et arrière, p. ex. véhicules à quatre roues motrices comportant un moteur à fluide ou électrique pour entraîner une ou plusieurs roues
18.
SYSTEMS AND METHODS FOR IMPROVED DIFFERENTIAL LOCKS
A dual-wheel differential system includes an in inner hub, an outer hub, and a differential assembly mechanically coupled between the inner hub and the outer hub to allow the inner hub and the outer hub to rotate at different angular speeds. A user-actuatable locking system is configured to mechanically lock the inner hub to the outer hub. The user-actuatable locking system may include at least one axially-translating or radially-translating locking pin configured to engage at least one of the inner hub and the outer hub. The locking system may be pneumatically, hydraulically, or electromechanically actuated.
F16H 48/24 - Dispositions pour supprimer ou modifier l'action différentielle, p. ex. dispositifs de verrouillage utilisant des embrayages ou des freins à engagement positif
19.
Systems and methods for improved differential locks
A dual-wheel differential system includes an in inner hub, an outer hub, and a differential assembly mechanically coupled between the inner hub and the outer hub to allow the inner hub and the outer hub to rotate at different angular speeds. A user-actuatable locking system is configured to mechanically lock the inner hub to the outer hub. The user-actuatable locking system may include at least one axially-translating or radially-translating locking pin configured to engage at least one of the inner hub and the outer hub. The locking system may be pneumatically, hydraulically, or electromechanically actuated.
B60B 11/02 - Ensembles de roues distinctes montées pour rotation indépendante ou couplée
F16H 48/24 - Dispositions pour supprimer ou modifier l'action différentielle, p. ex. dispositifs de verrouillage utilisant des embrayages ou des freins à engagement positif
F16H 48/32 - Dispositions pour supprimer ou modifier l'action différentielle, p. ex. dispositifs de verrouillage utilisant des moyens actionnés de l'extérieur utilisant des actionneurs à pression de fluide
F16H 48/34 - Dispositions pour supprimer ou modifier l'action différentielle, p. ex. dispositifs de verrouillage utilisant des moyens actionnés de l'extérieur utilisant des actionneurs électromagnétiques ou électriques
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
(1) Cam shafts
(2) Land vehicle parts, namely, brakes, brake chambers, brake linings, brake drums, brake shoes and blocks, brake return springs, brake rollers, brake anchor pins, brake rotors, and brake slack adjusters; brake kits comprised primarily of brake chambers, brake linings, brake drums, brake shoes and blocks, brake return springs, brake rollers, brake anchor pins, brake rotors, and brake slack adjusters, and also including cam shafts, sold as a unit
21.
Modular independent suspension and method of producing the same
A method of producing a modular independent suspension having portal wheel ends is disclosed herein. The method includes, but is not limited to, assembling a first flank component and a second flank component to opposite sides of a sub-frame configured to receive a carrier. The method further includes assembling a first upper control arm and a first lower control arm to the first flank component. The method further includes assembling a second upper control arm and a second lower control arm to the second flank component. The method further includes assembling a first portal wheel end to the first upper control arm and the first lower control arm. The method still further includes assembling a second portal wheel end to the second upper control arm and the second lower control arm.
A dual wheelend for an axle assembly having a rotatable axle shaft. The wheelend comprises a spindle defining a first axis. An intermediate hub is supported on the spindle for rotation about the first axis during rotation of the axle shaft. An inner wheel hub and an outer wheel hub are adjacent one another and are each supported on the intermediate hub for rotation about the first axis. A differential mechanism interconnects the inner and outer wheel hubs. A pin is disposed through a pinion along a second axis and couples the differential mechanism to the intermediate hub for driving the wheel hubs during rotation of the intermediate hub and permitting relative rotation between the wheel hubs relative to the intermediate hub. The pin includes proximal end with a head disposed on the proximal end for engaging the pinion and sandwiching the pinion between the head and the intermediate hub.
B62D 61/10 - Véhicules à moteur ou remorques, caractérisés par la disposition ou le nombre de roues et non prévus ailleurs, p. ex. quatre roues disposées en losange avec plus de quatre roues
A strut assembly includes a damper having a housing and a rod moveable relative to the housing along a longitudinal axis. The strut assembly includes a flexible membrane configured to receive a pressurized gas to form an air spring. A coil spring defines an inner diameter with the housing disposed within the inner diameter to permit relative movement between the coil spring and the housing. The coil spring is at least partially disposed outside the flexible membrane relative to the longitudinal axis.
A wheel assembly for a vehicle includes a knuckle having an upper end and a lower end. A bracket is mounted to one of the upper end and the lower end of the knuckle by a plurality of fasteners. A ball joint is mounted to the bracket and configured for attaching the wheel assembly to the vehicle. One of the knuckle and the bracket defines a boss and the other defines a bore. The boss is slideably disposed within the bore in slip fit engagement. The boss transfers a load between the knuckle and the bracket in both a vertical direction along a king pin axis and a horizontal direction along a longitudinal axis of the vehicle.
An axle assembly for a vehicle comprising a stationary spindle and a rotatable axle shaft. An intermediate hub is supported on the spindle. Adjacent inner and outer wheel hubs are supported on the intermediate hub. A differential mechanism interconnects the inner and outer wheel hubs for driving both of the wheel hubs and for permitting relative rotation between the wheel hubs. At least one differential bushing is disposed between the differential mechanism and the intermediate hub. A gear reduction system interconnects the intermediate hub and the axle shaft for providing torque multiplication. A wet disc brake device is coupled between the spindle and the intermediate hub.
B62D 61/10 - Véhicules à moteur ou remorques, caractérisés par la disposition ou le nombre de roues et non prévus ailleurs, p. ex. quatre roues disposées en losange avec plus de quatre roues
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
Independent suspension axle systems for land vehicles and component parts for land vehicle independent suspension axle systems, namely, axles, carriers, control arms, ball joints, wheel ends, ball joints with control arms, bushing kits, tie rods, sleeves, idler arms, center links, stabilizer kits, inner sockets, pitman arms, springs, knuckles, connecting rods.
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
Independent suspension axle systems for land vehicles and component parts for land vehicle independent suspension axle systems, namely, axles, carriers, control arms, ball joints, wheel ends, ball joints with control arms, bushing kits, tie rods, sleeves, idler arms, center links, stabilizer kits, inner sockets, pitman arms, springs, knuckles, connecting rods
A strut assembly includes a damper having a housing and a rod moveable relative to the housing along a longitudinal axis. The strut assembly includes a flexible membrane configured to receive a pressurized gas to form an air spring. A coil spring defines an inner diameter with the housing disposed within the inner diameter to permit relative movement between the coil spring and the housing. The coil spring is at least partially disposed outside the flexible membrane relative to the longitudinal axis.
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
Land vehicle parts for vehicles having a GWT of more than 45 metric tons; namely axles, suspension systems and drive train components for vehicles having a GVW of more than 45 metric tons; namely transfer cases, transmissions, drive shafts, brakes, torque hubs, planetary wheel ends and differential assemblies for vehicles having a GVW of more than 45 metric tons.
12 - Véhicules; appareils de locomotion par terre, par air ou par eau; parties de véhicules
Produits et services
Land vehicle parts, namely, axles, suspension systems and drive train components, namely, land vehicle transfer cases, transmissions, drive shafts, brakes, torque hubs, planetary wheel ends and differential assemblies
An axle assembly for a vehicle comprising a stationary spindle and a rotatable axle shaft. An intermediate hub is supported on the spindle. Adjacent inner and outer wheel hubs are supported on the intermediate hub. A differential mechanism interconnects the inner and outer wheel hubs for driving both of the wheel hubs and for permitting relative rotation between the wheel hubs. At least one differential bushing is disposed between the differential mechanism and the intermediate hub. A gear reduction system interconnects the intermediate hub and the axle shaft for providing torque multiplication. A wet disc brake device is coupled between the spindle and the intermediate hub.
B62D 61/10 - Véhicules à moteur ou remorques, caractérisés par la disposition ou le nombre de roues et non prévus ailleurs, p. ex. quatre roues disposées en losange avec plus de quatre roues