Patent ID: 7867125

Claim:
A rear wheel drive apparatus for a four wheel drive hybrid electric vehicle, comprising: a motor generator for driving rear wheels; a reduction gear set for reducing an output speed of the motor generator and transmitting the reduced output speed; a differential gear set interposed between the reduction gear set and right and left wheel shafts of the rear wheels; and a clutch unit interposed between the differential gear set and the right wheel shaft to perform a differential limiting, wherein the motor generator, the reduction gear set, the differential gear set and the differential limiting clutch unit are arranged in a single shaft structure according to the right and left wheel shafts in a state that the left wheel shaft is inserted into a hollow inner part of an output shaft of the motor generator, the reduction gear set includes a planetary gear set in which a ring gear is fixed, a sun gear is coupled to the motor output shaft, and a carrier is provided through which output is transmitted, and the differential gear set includes a first planetary gear set interposed between the carrier of the reduction gear set and the left wheel shaft, and a second planetary gear set interposed between the first planetary gear set and the right wheel shaft, wherein the first planetary gear set is provided with a sun gear coupled to the carrier of the reduction gear set and a carrier coupled to the left wheel shaft.