Power transmission for a motor vehicle comprising an electric driving motor

摘要

The invention relates to a power transmission apparatus (100) for vehicles which can realize a high torque transmission efficiency and a high reduction gear ratio of a reduction gear unit (12;60) with a more compact structure, and a vehicle-driving electric machinery system using the power transmission apparatus for vehicle. The power transmission apparatus (100) for vehicles comprises a motor (10), a reduction gear unit (12;60) for decelerating power outputted from the motor, and a differential gear unit (14;61) for distributing the power decelerated by the reduction gear unit (12;60) to left and right wheels. The reduction gear unit (12;60) is a reduction gear mechanism including a plurality of gears (34-37;63-66) mounted over a shaft (31,32;62) which is rotatably held by a housing in a fixed position. The reduction gear unit (12;60) and the differential gear unit (14;61) are arranged within an area in oppositely facing relation to an axial end surface of the motor (10).