Patent ID: 7276005

Claim:
A wheel drive system for independently driving right and left wheels of a vehicle, the wheel drive system being disposed between the right and left wheels of the vehicle, the wheel drive system comprising: a coaxial three-layer motor comprising an inner rotor, an outer rotor and a stator which are coaxially arranged, the coaxial three-layer motor being housed in a motor case; a first planetary gear reduction mechanism whose input is connected to the inner rotor, and whose output is connected to a first drive shaft of one of the right and left wheels; and a second planetary gear reduction mechanism whose input is connected to the outer rotor and whose output is connected to a second drive shaft of the other of the right and left wheels, a reduction ratio of the first planetary gear reduction mechanism being greater than a reduction ratio of the second planetary gear reduction mechanisms, wherein both the first and second planetary gear reduction mechanisms are of a single pinion type.