Abstract: A motor casing containing a motor has an end wall with bosses and bolt receiving holes positioned radially inward relative to a stator mounted in a circumferential wall of the motor casing. A gear unit with a gear casing includes bosses and bolt holes on its periphery mating with bosses and bolt receiving holes of the motor casing to thus enable a substantial reduction in size and weight of the gear casing.

Abstract: A drive apparatus for an electric vehicle comprises a motor (1), a gear section (9) for transmitting rotation of a rotor shaft (2) of the motor to a wheel, and a case (10, 90) for accommodating the motor and the gear section. The case has a partition (12) that separates a motor chamber (m) for accommodating the motor and a gear chamber (g) for accommodating the gear section, and the partition has an orifice (53) that connects a lower portion of the motor chamber and the gear chamber. Supplying means (5) is provided for supplying oil from the gear chamber into the motor chamber in accordance with rotation of the gear section. Through the operation of the orifice, oil gathers in a lower portion of the motor chamber and, thus, the motor chamber serves as a reservoir.

Abstract: A hydraulic circuit for an electric car drive train including a motor, a torque transmission device for transmitting the output torque of the motor to drive wheels, an oil pump for feeding the oil from an oil reservoir, a drive device for rotationally driving the oil pump and a discharge circuit for receiving oil discharged from the oil pump. A lubrication circuit connects to the discharge circuit, through a first throttle, to the torque transmission device. A cooling circuit connects to the discharge circuit through a second throttle and guides the flow of oil to the motor. A valve arranged between the discharge circuit, upstream of the first throttle, and the cooling circuit feeds the oil from the discharge circuit to the cooling circuit when the oil pressure of the discharge circuit exceeds a predetermined level.