Vehicle differential device

A vehicle differential device configured to distribute drive force of a vehicle to a first output shaft and a second output shaft, the vehicle differential device comprising:

• a first inner helical gear configured to rotate integrally with the first output shaft and having outer peripheral helical teeth on an outer peripheral surface of the first inner helical gear;
• a first outer helical gear disposed on an outer periphery of the first inner helical gear and having inner peripheral helical teeth on an inner peripheral surface of the first outer helical gear, the inner peripheral helical teeth of the first outer helical gear configured to mesh with the outer peripheral helical teeth of the first inner helical gear;
• a second inner helical gear configured to rotate integrally with the second output shaft and having outer peripheral helical teeth on an outer peripheral surface of the second inner helical gear;
• a second outer helical gear disposed on an outer periphery of the second inner helical gear and having inner peripheral helical teeth on an inner peripheral surface of the second outer helical gear, the inner peripheral helical teeth of the second outer helical gear configured to mesh with the outer peripheral helical teeth of the second inner helical gear;
• a housing configured to accommodate the first outer helical gear and the second outer helical gear;
• a friction member disposed between the first outer helical gear and the second outer helical gear;
• and
• a plurality of pinion gear sets held in the housing, each of the pinion gear sets including
• a first pinion gear configured to mesh with the first outer helical gear, and
• a plurality of second pinion gears configured to mesh with the second outer helical gear, the first pinion gear integrally including
• an axially one end side gear portion configured to mesh with the first outer helical gear, and
• an axially other end side gear portion configured to mesh with the second pinion gears, the second pinion gears being configured to mesh with the second outer helical gear at positions separated from each other in a circumferential direction of the second outer helical gear, and the axially other end side gear portion of the first pinion gear being configured to mesh with the second pinion gears at positions radially outward of the second outer helical gear.