A modular wheel assembly for a power drive unit (PDU) may comprise a hub and a disc stack coupled to the hub. The hub may be a splined hub defining a plurality of spline recesses. The disc stack may comprise a plurality of discs. Each disc of the plurality of discs may comprise a ring having a plurality of splines that are complementary to the spline recesses, and that are configured to interlock with the spline recesses. Each disc may further comprise an annular segment made of one of a first material and second material. The annular segment may be a tire. In the event of damage or wear, each disc in the plurality of discs may be removed and repaired or replaced.

A wheel assembly bushing for in-wheel electric motors where the bushing includes a hydraulic chamber positioned within a resilient sleeve of the bushing and a helical fluid channel that extends helically about an inner bushing member between first and second fluid channel ends, which are arranged in fluid communication with the hydraulic chamber. An outer body extends annularly about the resilient sleeve, which permits relative movement between the inner bushing member and the outer body. The fluid channel is configured to produce inertance. This inertance, when combined with other damping and stiffness effects of the wheel assembly bushing, provides phase and magnitude shifts between force and velocity, which ultimately reduce magnetic gap deformation in the in-wheel electric motor.

An electric motor includes: a stator including stator coils; and a rotor arranged outside the stator. Further, a plurality of fins is provided at a position, which faces the stator coils, on an inner surface of the rotor.

An in-wheel motor drive device (10) includes a wheel hub bearing unit (11) having an outer ring (13), an inner ring (12) protruding from the outer ring to one side in an axial (O) direction, rolling elements (14) between the outer ring and the inner ring, and a fixing bolt (15) for fixing the outer ring to a non-rotary member (102); and a brake disk (55) having a connecting portion (58) configured to connect with one end of the inner ring, a cylindrical portion (57) extending from the connecting portion to the other side in the axial direction and disposed coaxially to the inner ring, and at least a part of the fixing bolt is received in an internal space of the cylindrical portion.

A brake system for an electric wheel drive unit has a housing that can be attached securely to the vehicle frame. The housing has a flange region and a shaft-like wheel carrier region secured to the flange region. A first brake component is connected to the housing and includes a first support part attached directly on a radial outer side of the wheel carrier region and a first brake disc element rotationally fixed to the first support part. A second brake component is rotatably mounted relative to the housing and has a second support part and a second brake disc element rotationally fixed to the second support part. A hydraulic actuation device is provided with one or more pressure pistons arranged. A sliding element is provided for moveably coupling the pressure pistons with one of the brake disc elements.

An in-wheel drive device includes: a wheel bearing including a hub and an outer race spaced apart outward in a radial direction from the hub; and a speed reducer including a ring gear coupled to the wheel bearing. An outer surface of the ring gear, in the radial direction, and an inner surface of the wheel bearing, in the radial direction, adjoin to define first and second regions. The ring gear includes a protruding portion disposed on the outer surface of the ring gear in the second region and having a shape protruding toward the inner surface of the wheel bearing. The wheel bearing includes a recessed portion disposed on the inner surface of the wheel bearing in the second region and having a shape corresponding to a shape of the protruding portion. The protruding portion and the recessed portion engage each other in the second region.

The vehicle power device includes: a wheel bearing; and an electric motor including a stator and a rotor. The vehicle power device includes a rotor casing that is a cover member covering the electric motor and a part of the wheel bearing, the part being located on an inboard side with respect to the hub flange, such that a separated space is defined inside the cover member. A seal member configured to prevent entry of moisture from a press-fitting part where a hub bolt is press-fitted into a bolt hole provided in the hub flange is disposed near the press-fitting part. The hub flange is formed with an annular groove coaxial with the hub bolt in an area where a head of the hub bolt comes into contact with an inboard-side surface of the hub flange, and the seal member having a ring shape is disposed in the annular groove.

A wheel rotation speed measurement assembly and a wheel hub driving system. The assembly includes a wheel hub bearer, a synchronous shaft and a compiler. The wheel hub bearer has a central shaft and an outer ring. The central shaft is hollow with an inner cavity and forms a torsion-resistant connection with a vehicle suspension. The outer ring can be driven to rotate relative to the central shaft, and forms a torsion-resistant connection with the wheel hub. The synchronous shaft is arranged in the inner cavity and has an end that is close to the first end has a torsion-resistant connection with the outer ring. The compiler is mounted at an end of the synchronous shaft away from the first end. The assembly has a simple structure and can measure the wheel rotation speed directly. Rotation speed output by this compact wheel hub driving system can be accurately measured.

An omnidirectional wheel includes a hub and a number of driven wheels. The hub defines a number of mounting grooves. Each mounting groove includes an axle provided therein. Each driven wheel includes a driven roller and a cover layer. Each of two ends of the driven roller defines a fixing hole. Each of the two holes receives the axle. The cover layer is sleeved on an outer side of the driven roller.

A wheel hub drive as a direct drive of a wheel of a vehicle having an electric motor preferably designed as a permanent-magnet synchronous motor (PMSM)—external rotor motor—which is substantially arranged in the region within the wheel, wherein a rotating part of a friction brake is frictionally, interlockingly, and/or integrally connected to the motor for braking. The rotating part is operatively connected to the rotor of the motor, directly or indirectly, from outside of the motor.