Patent ID: 8591373
Filing Date: 2013-11-26
Classification: F16H

Abstract:
1. A differential gear device for a vehicle transmitting power from a power source to right and left driving wheels with allowing relative rotation of the right and left driving wheels, comprising: a differential case that is drivably rotated by the power from the power source of the vehicle, a pinion shaft that is fixed to the differential case in a direction orthogonal to a rotational axis of the differential case, side gears that are provided in the differential case coaxially with the rotational axis of the differential case such that the pinion shaft is provided therebetween, the side gears to be rotated together with the right and left driving wheels, a pinion gear that is directly rotatably supported by the pinion shaft, a tapered outer surface that is directly formed on at least a part of a supporting portion of the pinion shaft which supports the pinion gear, and a tapered inner surface that is directly formed on at least a part of a fitting hole of the pinion gear into which the pinion shaft is inserted, wherein the tapered outer surface and the tapered inner surface slidably contact with each other and have a diameter decreasing toward an outer circumference from the rotational axis, respectively, the differential gear device further comprising a pressing member that moves the pinion gear inward in an axial direction of the pinion shaft as an engagement reaction force between the pinion gear and the side gears decreases.