Patent ID: 8628445

Claim:
A vehicle driving system comprising: a first drive shaft and a second drive shaft that are disposed on the right and left of a vehicle; a differential mechanism that allows a differential motion between the first drive shaft and the second drive shaft; a drive input member that is disposed at an outer peripheral side with respect to the differential mechanism, and inputs a power from a driving power source to the differential mechanism; and fastening members that fasten the differential mechanism and the drive input member together, wherein the differential mechanism comprises: a first sun gear that is connected to the first drive shaft; a second sun gear that is connected to the second drive shaft; a first pinion gear that is engaged to the first sun gear; a second pinion gear that is engaged to the second sun gear and the first pinion gear; and a carrier that is fastened to the drive input member and rotatably supports the first pinion gear and the second pinion gear, and wherein a spline joint portion that causes the carrier and the drive input member to be fitted in a spline manner is provided at an outer peripheral end portion of the carrier and an inner peripheral end portion of the drive input member, the fastening members are arranged out of phase with the spline joint portion in the circumferential direction, and the spline joint portion is arranged at a part of the carrier where the first pinion gear and the second pinion gear are supported by the carrier.