Vehicle drive system

A vehicle drive system comprising:

• a rotating electric machine;
• an output drivingly coupled to a wheel;
• a differential gear device provided in a power transmission path between the rotating electric machine and the output, the differential gear device including at least a first rotating element drivingly coupled to the rotating electric machine, a second rotating element drivingly coupled to the output, and a third rotating element that is selectively fixed by a one-way clutch to a non-rotating member and that is selectively fixed by a friction brake to the non-rotating member;
• and
• a clutch that selectively couples together two of the first rotating element, the second rotating element, and the third rotating element, wherein
• a reaction force torque that acts on the third rotating element when the rotating electric machine outputs a positive torque in a forward powering direction is defined as a first reaction force torque,
• a reaction force torque that acts on the third rotating element when the rotating electric machine outputs a negative torque opposite in direction to the positive torque is defined as a second reaction force torque,
• the one-way clutch is structured to be switchable at least between a one-way restriction state in which rotation of the third rotating element in one direction is restricted and a rotation restriction state in which rotation of the third rotating element in both directions is restricted, and
• in the one-way restriction state, the one-way clutch restricts rotation of the third rotating element in a rotation direction caused by the first reaction force torque while allowing rotation of the third rotating element in a rotation direction caused by the second reaction force torque.