| 摘要 |
A differential gear device for a vehicle capable of improving durability without causing vibration and noise is provided. At least a part of a supporting portion 68 of a pinion shaft 56 that supports a pinion gear 60 and at least a part of a fitting hole 66 of the pinion gear 60 into which the pinion shaft 56 is inserted respectively have tapered surfaces 70 and 72 each having a diameter decreasing toward an outer circumference of the supporting portion or the pinion gear. Driving force is transmitted from a differential case 50 to side gears 581 and 58r through the pinion shaft 56 and the pinion gear 60 rotatably supported. Here, the pinion gear 60 is moved outward in the axial direction of the pinion shaft 56 according to the engagement reaction force between the pinion gear 60 and the side gears 581 and 58r. As a result, the fitting clearance C between the pinion shaft 56 and the pinion gear 60 increases with an increase in torque transfer load, whereby high durability of the differential gear device is obtained.
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