A gear-shifting device is disclosed. The device comprises a first motor having a first rotor. The first rotor turns clockwise and counter-clockwise, creating a wobbling action. The device further comprises a compound planetary transmission, comprising a transmission ring attached to a ring gear. The compound planetary transmission receives power from the first rotor. The device further comprises a second motor having a second rotor. The second rotor turns clockwise and counter-clockwise. The device further comprises a shift assembly, comprising a drum, a cap, and a pinion gear. The pinion gear receives power from the second rotor. The drum locks with the pinion gear such that the drum rotates with the pinion gear. The transmission ring is attached to the drum, such that the transmission ring moves laterally as the drum rotates. The ring gear locks and unlocks with the cap as the drum rotates. The wobbling action enables the locking.

In a bevel gear pair, a first gear and a second gear are applied with tooth top modification, and a ratio of a distance from a pitch circle to a starting position of the tooth top modification to a distance from the pitch circle to a tooth top in the first gear is larger than a ratio of a distance from a pitch circle to a starting position of the tooth top modification to a distance from a pitch circle to a tooth top in the second gear. Thus, the bevel gear pair that can achieve smooth meshing is provided.

According to various embodiments, disclosed is a mechanical differential assembly for a wheeled vehicle is disclosed including a housing a pinion gear operable to both rotate relative to the interior surface of the housing and be fixed relative to the interior surface of the housing and a clutch portion fixed to the pinion gear.

A driveline component with a differential having a differential gearset mounted in a differential case. The differential gearset has first and second side gears and one or more pinion gears that are meshed with the first and second side gears. The differential gearset is configured to limit inboard thrusting of the first and second side gears so that backlash will be always be present between the pinion gears and each of first and second side gears.

In a support structure for a rotating member, in which a support body supporting a rotating member so as to be rotatable around a predetermined axis is provided with a spherical support face that is recessed toward a side opposite to the rotating member, and a back face of the rotating member is rotatably and slidably supported on the support face, the back face of the rotating member is formed as a convexly curved face that is curved so that portions on opposite sides of the axis each protrude toward the support face when viewed in a cross section containing an entirety of the axis. In order for the back face to be supported on the support face via an apex portion of the convexly curved face, a radius of curvature of at least the apex portion is set smaller than a radius of curvature of the support face.

A power system includes an electric motor, a transmission, and a differential gear system. The transmission includes a first gear that is mechanically connected to the electric motor, a second gear that has a rotation axis in common with the first gear and is mechanically connected to a differential gear casing of the differential gear system, a pinion gear that meshes with the first gear and the second gear, and a pinion holder that rotatably supports the pinion gear. The pinion holder has a pinion gear supporting portion which is disposed on a side of the differential gear casing of the differential gear system to support the pinion gear, relative to a meshing portion between the second gear and the pinion gear. An inner diameter of the second gear at the meshing portion is equal to or smaller than an outer diameter of the pinion holder.

A worm gear assembly may include an input shaft having a first and second screw formed axially thereon, a first torque transfer unit comprising a first worm wheel operatively coupled to the first worm screw, a first radial pinion coaxially affixed to the first worm wheel, and a first axial crown wheel operatively coupled to the first radial pinion, and a second torque transfer unit comprising a second worm wheel operatively coupled to the second worm screw, a second radial pinion coaxially affixed to the second worm wheel, and a second axial crown wheel operatively coupled to the second radial pinion, wherein the first radial pinion is in meshed interface with the second radial pinion, and wherein torque differences between the first axial crown wheel and the second axial crown wheel are transmitted at least in part through said meshed interface.

A cage for mounting a set of pinion gears including: at least two support members disposed about a central axis; first and second axially spaced support arms extending circumferentially about the central axis and connecting the first and second support arms to form a cylindrically-shaped cage having an axially extending central passage. The central passage being coaxial with a wheel axle. The first and second arms and the at least two support members define a first window on one side of the cylindrical cage for receiving a pinion gear and a second window on the other side of the cylindrical cage for receiving another pinion gear. The support arms have axially aligned openings positioned at the first and second windows for receiving radially reduced and opposing heads of each of the pinion gears and supporting rotation of the pinion gears. The cage is mounted for rotation about the central axis.

An electric drive vehicle includes an electric motor having an output shaft, a gearbox assembly operably coupled to the output shaft, and a differential assembly configured to drive first and second axle shafts, where the first axle shaft includes separated first and second shaft portions. A disconnect system is configured to selectively connect the first shaft portion and the second shaft portion. In a driving mode, the disconnect system connects the first and second shaft portions for common rotation. In a towing mode, the disconnect system disconnects the first and second shaft portions to enable the electric drive vehicle to be towed without backdriving the electric motor.

A gear-shifting device is disclosed. The device comprises a first motor having a first rotor. The first rotor turns clockwise and counter-clockwise, creating a wobbling action. The device further comprises a compound planetary transmission, comprising a transmission ring attached to a ring gear. The compound planetary transmission receives power from the first rotor. The device further comprises a second motor having a second rotor. The second rotor turns clockwise and counter-clockwise. The device further comprises a shift assembly, comprising a drum, a cap, and a pinion gear. The pinion gear receives power from the second rotor. The drum locks with the pinion gear such that the drum rotates with the pinion gear. The transmission ring is attached to the drum, such that the transmission ring moves laterally as the drum rotates. The ring gear locks and unlocks with the cap as the drum rotates. The wobbling action enables the locking.