Motor drive assembly for a vehicle

摘要

A motor drive assembly for a vehicle is provided and includes an electric motor. A rotor of the electric motor includes a spindle rotatably supported by a first bearing located on a first side of the spindle close to a speed reducer and a second bearing located on a second side of the spindle opposite from the first side of the spindle and remote from the speed reducer. The spindle includes a tubular, hollow, rotor core mounting portion having an inner diameter larger than the diameter of a cylindrical surface on which the first bearing is fitted.

主权项

1. A motor drive assembly for a vehicle, comprising:
an electric motor including an annular stator and a rotor configured to rotate inside of the stator; a speed reducer configured to reduce a rotation speed output from the electric motor; and a differential configured to distribute a rotation output from the speed reducer to right and left vehicle wheels, wherein the rotor of the electric motor comprises a first bearing located on a first side of the rotor close to the speed reducer, a second bearing located on a second side of the rotor opposite from the first side of the rotor and remote from the speed reducer, a spindle rotatably supported by the first bearing and the second bearing, and a rotor core mounted on an outer periphery of the spindle and configured to receive a rotating force from the stator, wherein the spindle comprises a first shaft portion having, on an outer periphery thereof, a cylindrical first bearing fitting surface on which the first bearing is fitted, a tubular, hollow, rotor core mounting portion having an inner diameter larger than a diameter of the first bearing fitting surface, and an end plate closing an end portion of the rotor core mounting portion on a first side of the rotor core mounting portion close to the speed reducer, wherein the first shaft portion is coupled to the end plate, and wherein the speed reducer comprises:
an input shaft to which a rotation of the electric motor is input;a first input gear and a second input gear which are provided on the input shaft so as to rotate together with the input shaft;an output shaft arranged so as to be spaced apart from and be in parallel to the input shaft;a first output gear and a second output gear which are provided on the output shaft so as to be rotatable relative to the output shaft and which mesh with the first input gear and the second input gear, respectively;a first clutch incorporated between the first output gear and the output shaft;a second clutch incorporated between the second output gear and the output shaft;a speed change actuator by which either one of the first clutch and the second clutch is selectively engaged; anda differential drive gear through which a rotation of the output shaft is transmitted to the differential.