An axle system (150) for a vehicle comprises: —a differential unit (10) including a first housing (24) and a second housing (20) which rotationally receives at least part of said first housing; —at least one drive shaft (11) having one end configured to be connected to a wheel of the vehicle and one end connected to the differential unit (10) and rotationally received in the first housing (24), the drive shaft (11) including at least one joint (110) connecting two portions (114a, 114d) of the drive shaft (11) to transmit rotary motion between said portions; —a first bearing (30) secured around the drive shaft (11), placed between the drive shaft and the first housing (24), having an outer diameter (D30) smaller than the radial dimension (D) of the joint (110); —a second bearing (40) placed between the first housing (24) and the second housing (20); —at least one tightening member (50) to axially lock the first bearing outer ring (32) relative to the first housing (24). The tightening member comprises at least one manoeuvring portion (51) which is arranged in an offset relation relative to the joint (110), when looking axially towards the differential unit (10), so that the tightening member manoeuvring portion (51) is visible and accessible, at least during a tightening phase of an axle system mounting process.

Drive device for a motor vehicle, includes a differential for distributing a torque that can be supplied via a drive shaft to two output shafts and a superimposition gear coupled with the differential one of the output shafts and an additional motor for superimposing torques supplied from the output shaft, from the differential and from the additional motor, wherein the differential is coupled via a torque reducing transmission ratio device with the superimposition gear, wherein the superimposition gear includes a switching device that can be controlled with a control device, wherein the superimposition gear superimposes in a first switching mode torques supplied to the switching device from the output shaft.

A downsized torque vectoring device in which a passive rotation of an actuator is prevented. A torque vectoring device comprises: a differential mechanism that allows a differential rotation between a first rotary shaft and second rotary shaft; an actuator that applies torque to the differential mechanism to rotate the rotary shafts at different speeds; and a reversing mechanism that allows the rotary shafts to rotate in opposite directions. The reversing mechanism comprises a first control gear set and the second rotary shaft arranged coaxially around the rotary shafts, and gear ratios of the first control gear set and the second control gear set are set to different values. A speed increasing gear set and a speed reducing gear set are arranged between a prime mover and an output shaft of the actuator, and ring gears of the speed increasing gear set and the speed reducing gear set are connected to each other.

A torque vectoring device for preventing an unintentional relative rotation between the right wheel and the left wheel is provided. The torque vectoring device comprises: a drive motor; a differential unit formed of planetary gear units; a differential motor that applies torque to any one of reaction elements of the planetary gear units; a torque reversing mechanism transmitting torque of the first reaction element to the second reaction element while reversing; a rotary shaft connecting input elements of the planetary gear units; a first rotary member fitted onto an output shaft of the differential motor; and a differential action restricting mechanism for pushing a pushing member onto the first rotary member thereby applying brake torque to the output shaft of the differential motor.

A power transmission mechanism includes a first pinion gear meshed with a first sun gear coupled to a first output shaft; a second pinion gear meshed with a second sun gear coupled to a second output shaft and meshed with the first pinion gear; a differential case coupled to an input shaft and supporting the first and second pinion gears; an internal gear rotatable about the axes of the first and second output shafts; a motor generator coupled to the internal gear; a first one-way clutch including a first inner ring member configured to move in conjunction with the first pinion gear and a first outer ring member meshed with the internal gear; and a second one-way clutch including a second inner ring member configured to move in conjunction with the second pinion gear and a second outer ring member meshed with the internal gear.

An integrated electronic drive unit constructed in accordance to one example of the present disclosure includes a differential, a first axle, a second axle and a secondary power system. The differential includes a ring gear fixed for concurrent rotation with a differential case. The differential has a plurality of pinion gears rotatably mounted to the differential case and meshed with first and second side gears. The first axle is coupled to the first side gear. The second axle is coupled to the second side gear. The secondary power system is selectively engageable to at least one of the first and second axles. The integrated electronic drive unit is operable in an open differential mode, a braking mode, an electric vehicle start mode and a torque vectoring mode.

Methods and systems for a vehicle transmission are provided. In one example, a vehicle transmission system is provided that includes a first planetary gear set rotationally coupled to a second planetary gear set, a first electrical machine rotationally coupled to a sun gear in the first planetary gear set, and a second electrical machine rotationally coupled to a sun gear in the second planetary gear set. The transmission system also includes an inter-axle differential including a third planetary gear set rotationally coupled to a first axle and a second axle and selectively rotationally coupled to the first planetary gear set and the second planetary gear set, wherein the inter-axle differential is configured to selectively enable and disable speed differentiation between the first and the second axles.

A downsized complex planetary gear unit achieving a large speed reducing ratio. A first, second, and third gear arranged coaxially while rotating relatively. A first, second, third, and fourth planetary gear are formed integrally. The planetary gears are supported by a carrier in a rotatable manner. The first planetary gear is meshed with the first gear, the second planetary gear is meshed with the second gear, the third planetary gear is meshed with the second gear, and the fourth planetary gear is meshed with the third gear. A gear ratio between the first planetary gear and the first gear is different from a gear ratio between the second planetary gear and the second gear, and a gear ratio between the third planetary gear and the second gear is different from a gear ratio between the fourth planetary gear and the third gear.

A drive device for a vehicle axle, in particular a rear axle, of a two-track vehicle with an electric drive, wherein an electric machine is associated with every vehicle wheel of the vehicle axle, the electric machine shafts of which electric machine can be drivingly connected, by a first and a second shifting element, to a first and a second flange shaft of the vehicle wheels, and wherein in a first transmission gear, the first and the second shifting element are shifted and the electric machine shafts output directly to the flange shafts of the vehicle wheels via the first and the second shifting element. The vehicle axle has a transverse differential which, on the output side, outputs to the flange shafts of the vehicle wheels and, on the input side, can be drivingly connected to the electric machine shafts by means of a third and a fourth shifting element.

A vehicle drive system configured to achieve a required driving force of braking force without changing an orientation of a vehicle in the event of slippage of a wheel. The vehicle drive system comprises: a torque generating device; a differential mechanism that allows a relative rotation between a right wheel and a left wheel; a differential restricting device that restricts a differential rotation between the right wheel and the left wheel; and a steering mechanism that controls a turning angle of pairs of the wheels. A first controller controls the relative rotation between the right wheel and the left wheel to be smaller than a predetermined value and second controller further controls a turning angle of the wheels controlled by the steering mechanism.