An electric axle assembly includes a drive housing and a drive assembly. The drive assembly is housed in the drive housing and engages with wheels of a vehicle for rotating the wheels to move the vehicle along a ground surface. The drive assembly includes a drive input, one or more gearsets, and axle shafts. The one or more gearsets transfer motive force from the drive input to the axle shafts.

Disclosed is a power transmission device including a motor including a rotary shaft, a speed reducer provided on one side of the motor, and a power transmitter, provided inside the speed reducer, that transmits rotational force generated by driving of the motor to the speed reducer. The power transmitter transmits the power such that a ratio of rotational angular velocity of the speed reducer to rotational angular velocity of the rotary shaft is changed according to rotation directions of the rotary shaft of the motor.

A cooling system for a vehicle driven by in-wheel motors includes a cooling water channel provided in an in-wheel motor mounted on a wheel of a vehicle so that cooling water for cooling the in-wheel motor can pass through the cooling water channel, a cooling water channel provided in an inverter for driving and controlling the in-wheel motor so that cooling water for cooling the inverter can pass through the cooling water channel, a radiator provided to dissipate heat of cooling water that has cooled the in-wheel motor and the inverter by passing the cooling water, a cooling water circulation line connected such that cooling water can circulate between the cooling water channel of the in-wheel motor, the cooling water channel of the inverter, and the radiator, and a water pump configured to circulate cooling water through the cooling water circulation line by pumping cooling water in the cooling water circulation line.

Methods and systems for an electric drive axle of a vehicle are provided. An electric drive axle system includes, in one example a gear train configured to rotationally attach to an electric motor-generator, the gear train includes an output shaft having a clutch arranged thereon and configured to selectively rotationally couple a gear to the output shaft. The gear train further includes a lubrication channel extending between an output shaft and an axle shaft and including an outlet extending through the output shaft and opening into the clutch.

Methods and systems for an electric motor system are provided. In one example, a motor system is provided which comprises a first electric machine rotationally coupled to a second electric machine by a planetary gear set that has three components: a ring gear, a sun gear, and a carrier with a plurality of planet gears. In the system, the first electric machine varies in size from the second electric machine and one of the planetary assembly components is permanently grounded.

An electric vehicle transmission (7) includes an input shaft (10), an output shaft (11), a first planetary gear set (P1), a second planetary gear set (P2), and a third planetary gear set (P3). The input shaft (10) is provided for coupling to an electric machine (6). A first shift element (A), a second shift element (B), and a third shift element (C) are provided at least functionally as well. Also disclosed is a drive system (4), a vehicle drive train (5), and an electric vehicle.

A drive unit having a downsized brake device for applying a braking force to a drive wheel is provided. The drive unit comprises: a first brake device that applies braking torque to a first rotary member situated closer to a first motor than a first speed reducing device in a first torque transmitting route between the first motor and a first drive shaft; and a second brake device that applies braking torque to a second rotary member situated closer to a second motor than a second speed reducing device in a second torque transmitting route between the second motor and a second drive shaft.

A drive assembly has a drive housing with a gear set and a wheel mount configured to rotate about a rotation axis on a wheel bearing assembly. A clutch component is mounted to a clutch hub and disposed between an input shaft and the gear set to selectively cause rotation of the wheel mount. A clutch actuation assembly moves the clutch component into energized and de-energized states with respect to the input shaft. The clutch actuation assembly has a spring to position the clutch component in one of the energized and de-energized states and a piston to position the clutch component in the other of the energized and de-energized states. The clutch actuation assembly has a reaction plate that is acted upon in a first axial direction by the spring and is acted upon by the piston in a second axial direction.

A drive unit a drive unit which can prevent an occurrence of an unintentional relative rotation between the right and the left wheels is provided. The drive unit comprises: a first motor connected to the first driveshaft and a second motor connected to the second drive shaft; a first torque transmitting route between the first motor and the first drive shaft; a second torque transmitting route between the second motor and the second drive shaft; a first rotary member arranged in the first torque transmitting route; a second rotary member arranged in the second torque transmitting route; and a restriction device that restricts a differential rotation between the first rotary member and the second rotary member.

A transmission (GA) for an axle drive (1) of a motor vehicle includes a drive shaft (AN), two output shafts (AB1, AB2), at least four shafts (W1, W2, W3, W4), a differential, and two interconnected planetary gear sets (PS1, PS2). The drive shaft (AN) is a hollow shaft, and the drive shaft (AN) is coaxial with at least one of the two output shafts (AB1, AB2). The differential (D) is arranged, at least partly, within a cylindrical volume. An outer shell surface of the cylindrical volume is defined by an inner shell surface of a sun gear (SO2) of the second planetary gear set (PS2). A diameter of inner shell surface corresponds to an inner diameter of the sun gear (SO2) of the second planetary gear set (PS2).