A transmission unit includes: input shafts; output shafts configured to transmit with a corresponding input shaft via gears; a reverse output gear fitted over one output shaft; a reverse synchronizer; a reverse shaft configured to rotate together with a input shaft and a reverse output gear; a motor power shaft; a first and a second motor gears fitted over the motor power shaft; the second motor gear configured to rotate together with a shift driven gear; and a motor synchronizer. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

An electric drive for driving a motor vehicle comprises a housing assembly; an electric motor having a motor shaft provided in the form of a hollow shaft which is rotatingly drivable around a rotational axis A and which is connected to a drive gear; a transmission unit having at least one transmission shaft which is rotatingly drivable by the drive gear and having at least one output shaft, the output shaft extending through the hollow shaft; wherein between the hollow shaft and the output shaft an annular channel is formed, having a first opening facing the transmission unit and a second opening facing away from the transmission unit; wherein the housing assembly comprises a lubricant-guiding geometry that is configured to guide lubricant into a mouth region of the first opening of the annular channel, so that the lubricant can flow through the annular channel to the second opening.

An electric drive for driving a motor vehicle comprises a housing assembly; an electric motor having a motor shaft provided in the form of a hollow shaft which is rotatingly drivable around a rotational axis A and which is connected to a drive gear; a transmission unit having at least one transmission shaft which is rotatingly drivable by the drive gear and having at least one output shaft, the output shaft extending through the hollow shaft; wherein between the hollow shaft and the output shaft an annular channel is formed, having a first opening facing the transmission unit and a second opening facing away from the transmission unit; wherein the housing assembly comprises a lubricant-guiding geometry that is configured to guide lubricant into a mouth region of the first opening of the annular channel, so that the lubricant can flow through the annular channel to the second opening.

A vehicle includes an all-wheel-drive powertrain having an electric machine configured to power wheels. A controller is programmed to output a first calculated vehicle speed derived from integrating a measured longitudinal acceleration of the vehicle and output a second calculated vehicle speed based on the measured longitudinal acceleration and a speed of one of the wheels. The controller is further programmed to, responsive to a flag being present, command a speed to the electric machine that is based on the first vehicle speed to reduce wheel slip, and responsive to a flag not being present, command a speed to the electric machine that is based on the second vehicle speed to reduce wheel slip.

A vehicle includes an all-wheel-drive powertrain having an electric machine configured to power wheels. A controller is programmed to output a first calculated vehicle speed derived from integrating a measured longitudinal acceleration of the vehicle and output a second calculated vehicle speed based on the measured longitudinal acceleration and a speed of one of the wheels. The controller is further programmed to, responsive to a flag being present, command a speed to the electric machine that is based on the first vehicle speed to reduce wheel slip, and responsive to a flag not being present, command a speed to the electric machine that is based on the second vehicle speed to reduce wheel slip.

A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a controller that controls the engagement and disengagement of the dog clutch and the friction clutch. In this clutch control device, when there is a request to engage the dog clutch from a disengaged state, the controller, during the engagement control of the friction clutch, first controls the engagement of the friction clutch, monitors the change gradient of the clutch rotational speed difference of the dog clutch and starts engagement of the dog clutch upon determining that the gradient of the clutch rotational speed difference is no longer decreasing.

To arrange a power unit, an electric power conversion unit, and engine-related components compactly, a drive motor, a reduction drive, a generator, and an engine body are integrally arranged in this order in a vehicle width direction of a power unit compartment such that respective heights thereof are substantially the same. An electric power conversion unit, in which a motor inverter, an electric power generation inverter, and a DC/DC converter are integrated, is arranged above the drive motor, the reduction drive, and the generator. Engine-related components such as a low-voltage battery, an air cleaner, and an oil filter are arranged above the engine body.

A hybrid vehicle may be a series hybrid or a parallel hybrid vehicle. One embodiment of a parallel hybrid vehicle includes an engine, a transmission coupled to the engine, a front drive coupled to the transmission through a prop shaft, a rear drive coupled to the transmission, a traction motor drivingly coupled to the prop shaft, and a battery to operate the traction motor.

A hybrid vehicle may be a series hybrid or a parallel hybrid vehicle. One embodiment of a parallel hybrid vehicle includes an engine, a transmission coupled to the engine, a front drive coupled to the transmission through a prop shaft, a rear drive coupled to the transmission, a traction motor drivingly coupled to the prop shaft, and a battery to operate the traction motor.

An electric drive module for transferring torque to wheels of a motor vehicle a planetary gearset having a first member driven by the rotor and a second member. A synchronizer restricts a third member of the planetary gearset from rotation when the electric drive module operates at a first drive ratio. The synchronizer transfers energy from the rotating rotor to the third member during a shift between the first drive ratio and a second drive ratio to match the rotational speeds of the rotor and the second member. A reduction unit includes an input member being driven by the second member and also includes an output member driven at a reduced speed relative to the input member. A differential assembly includes an input driven by the output member, a first differential output driving a first output shaft, and a second differential output driving a second output shaft.