Patent ID: 8585525

Claim:
A left and right wheels drive system comprising: a first drive source and a second drive source; a left drive wheel and a right drive wheel; and a gear mechanism interposed between the first and second drive sources and the left and right drive wheels, the gear mechanism including: a pinion set in which a plurality of pinion gears are installed on one shaft; and an element group which is linked with the pinion set and which includes a first element, a second element, a third element and a fourth element, wherein when the first element is held stationary, the second, third and fourth elements rotate in the same direction, when the first element is held stationary, the second element rotates at a higher speed than the third and fourth elements, one of the first and second drive sources is connected to the first element, the other of the first and second drive source is connected to the second element, one of the left and right drive wheels is connected to the third element, and the other of the left and right drive wheels is connected to the fourth element, wherein the pinion set is a twin pinion including: a first pinion gear; and a second pinion gear of which a reference pitch diameter is larger than that of the first pinion gear, the element group includes: a first sun gear which is adapted to mesh with the first pinion gear; a second sun gear which is adapted to mesh with the second pinion gear; a carrier which pivotally supports the twin pinion; and a ring gear which is adapted to mesh with one of the first and second pinion gears, and the first element is the ring gear, the second element is the second sun gear, the third element is the carrier, and the fourth element is the first sun gear.