| 摘要 |
A bearing device for a driving wheel is provided to improve service life thereof by preventing strain from being generated inside the bearing device, where the strain is caused by deformation of a hub ring and an inner ring by loads acting in a direction of forming a contact angle. In the bearing device for a driving wheel comprising an outer ring on an inner peripheral surface of which raceways of double rows are formed, a hub ring on an outer peripheral surface of which one of the raceways opposing the raceways of the outer ring and a wheel mounting flange are formed, an inner ring fitted onto a small-diameter stepped portion of the hub ring and formed with the other raceway on its outer peripheral surface, rolling elements of double rows installed between each of the raceways between the outer ring and the hub ring and between the outer ring and the inner ring, and a constant velocity universal joint having the joint outer ring of which a shaft portion is fitted into the hub ring through serrated portions in such a manner that torque is transmittable, a pilot portion is provided between a base part of the shaft portion of the joint outer ring and the small-diameter stepped portion of the hub ring, and the clearance of the pilot portion is set to 0.4 mm or less.
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