Patent ID: 8632434

Claim:
A drive device comprising: an electric motor that outputs drive power, and a reducer disposed between an output shaft of the electric motor and a drive axle connected to a wheel; a one-way power transmission device that transmits a one-way rotation power of the electric motor to the drive axle; and a two-way power transmission device that transmits a two-way rotation power of the electric motor to the drive axle, wherein the one-way power transmission device and the two-way power transmission device are disposed on drive power transmission passage from the electric motor to the drive axle, wherein: the reducer is a planetary gear reducer comprising three rotation elements, the output shaft of the electric motor is connected to a first rotation element, the drive axle is connected to a second rotation element, the one-way power transmission device and the two-way power transmission device are connected to a third rotation element, the electric motor comprises first and second electric motors disposed on the left and right sides in a vehicle width direction, the planetary gear reducer comprises first and second reducers disposed on the left and right sides in the vehicle width direction, the third rotation element of the first reducer and the third rotation element of the second reducer are connected to each other, the drive power of the first electric motor is transmitted to a left wheel drive axle via the first reducer, the drive power of the second electric motor is transmitted to a right wheel drive axle via the second reducer, the first rotation element of the planetary gear reducer is a sun gear, the second rotation element thereof is a carrier, and the third rotation element thereof is a ring gear, the carrier supports duplex pinions comprising a first pinion engaged with the sun gear and a second pinion engaged with the ring gear, wherein a diameter of the second pinion is smaller than that of the first pinion, and the two-way power transmission device is disposed so as to overlap the first pinion of the duplex pinions in a radial direction and to overlap the second pinion in an axial direction.