A transmission unit includes: gear pairs; input shafts; output shafts performing power transmission with the input shafts via the gear pairs; a motor power output gear disposed on one of the output shafts; a motor power shaft; a first motor power shaft gear disposed on the motor power shaft and configured to rotate together with one shift driving gear; a second motor power shaft gear disposed on the motor power shaft and configure to rotate together with the motor power output gear; and an output idler gear fitted over the motor power shaft and configured to rotate together with the motor power shaft via a synchronizer. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

A transmission unit includes: gear pairs; input shafts; output shafts performing power transmission with the input shafts via the gear pairs; a motor power output gear disposed on one of the output shafts; a motor power shaft; a first motor power shaft gear disposed on the motor power shaft and configured to rotate together with one shift driving gear; a second motor power shaft gear disposed on the motor power shaft and configure to rotate together with the motor power output gear; and an output idler gear fitted over the motor power shaft and configured to rotate together with the motor power shaft via a synchronizer. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

In a left-right wheel driving device (10) including two motors (1, 2) that drive left and right wheels and a gear mechanism (3) that amplifies a torque difference between the two motors (1, 2) and transmits the amplified torques to the left and right wheels, respective, rotating shafts (1A, 2A) of the two motors (1, 2) are coaxially disposed. The left-right wheel driving device (10) further includes motor shafts (11) that are positioned between the rotating shafts (1A, 2A) coaxially with the rotating shafts (1A, 2A) and that are each provided with a motor gear (21), counter shafts (12) that are disposed in parallel to the motor shafts (11) and that are each provided with a first intermediate gear (22) meshing with the motor gear (21) and a second intermediate gear (23) having a diameter smaller than that of the first intermediate gear (22), and output shafts (13) that are disposed in parallel to the motor shafts (11) and that are each provided with an output gear (24) meshing with the second intermediate gear(23). The gear mechanism (3) is disposed on one end side of each of the output shafts (13) and one of the left and right wheels is disposed on the other end side of the output shaft (13).

A vehicle driveline component having a dual friction clutch differential assembly and a hydraulic circuit for operating the friction clutches. The hydraulic circuit includes a pair of normally open, solenoid operated valves that are selectively closed to control the fluid pressure that acts on the friction clutches. The hydraulic circuit provides a simplified and cost-effective means for providing disconnecting and/or torque vectoring capabilities to the vehicle driveline component.

A vehicle driveline component having a dual friction clutch differential assembly and a hydraulic circuit for operating the friction clutches. The hydraulic circuit includes a pair of normally open, solenoid operated valves that are selectively closed to control the fluid pressure that acts on the friction clutches. The hydraulic circuit provides a simplified and cost-effective means for providing disconnecting and/or torque vectoring capabilities to the vehicle driveline component.

A torque vectoring device having a downsized brake device for stopping drive wheels is provided. The torque vectoring device comprises: a drive motor; a differential unit including a first planetary gear unit connected a right drive wheels, and a second planetary gear unit connected to a left drive wheel; a differential motor that applies torque to any one of reaction elements; a torque reversing mechanism that transmits torque between the reaction elements while reversing; a rotary shaft connecting input elements; a rotary member that transmits torque of an output shaft of the drive motor; and a brake device that is contacted frictionally to the rotary member to establish a braking force.

A torque vectoring device having a downsized brake device for stopping drive wheels is provided. The torque vectoring device comprises: a drive motor; a differential unit including a first planetary gear unit connected a right drive wheels, and a second planetary gear unit connected to a left drive wheel; a differential motor that applies torque to any one of reaction elements; a torque reversing mechanism that transmits torque between the reaction elements while reversing; a rotary shaft connecting input elements; a rotary member that transmits torque of an output shaft of the drive motor; and a brake device that is contacted frictionally to the rotary member to establish a braking force.

A motor drive unit having an electromagnetic brake serving as an inboard brake that may also be used as a parking brake is provided. In the motor drive unit, output torque of a drive motor is distributed to a first driveshaft and a second driveshaft. The motor drive unit comprises: an electromagnetic brake device that stops rotation of an output shaft by contacting a brake stator to a brake rotor; a brake motor that generates torque when energized; and an engagement force generating device that generates an engagement force to engage the brake member with the rotary member when the output torque of the brake motor is applied thereto, and that maintains the engagement between the brake member and the rotary member when current supply to the electromagnetic brake device and the brake motor is stopped.

A motor drive unit having an electromagnetic brake serving as an inboard brake that may also be used as a parking brake is provided. In the motor drive unit, output torque of a drive motor is distributed to a first driveshaft and a second driveshaft. The motor drive unit comprises: an electromagnetic brake device that stops rotation of an output shaft by contacting a brake stator to a brake rotor; a brake motor that generates torque when energized; and an engagement force generating device that generates an engagement force to engage the brake member with the rotary member when the output torque of the brake motor is applied thereto, and that maintains the engagement between the brake member and the rotary member when current supply to the electromagnetic brake device and the brake motor is stopped.

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.