| 摘要 |
The present invention addresses the problem of providing a bearing device for a vehicle wheel which which the amount of deformation in an opening of an outer member can be reduced and decreases in rolling fatigue service life can be prevented while keeping overall weight increase to a minimum. The present invention provides a bearing device (1) for a vehicle wheel provided with: an outer member (2) in which a double row of outside rolling surfaces (2C, 2D) are formed integrally; and an inner member comprising a hub wheel (3) which integrally has a vehicle wheel attachment flange (3B) for attaching a vehicle wheel and in which a small-diameter ridge (3A) is formed, and at least one inner wheel (4) press-fitted into the small-diameter ridge (3A) of the hub wheel (3), a double row of inside rolling surfaces (3C, 4A) being formed in the inner member so as to face the double row of outside rolling surfaces (2C, 2D); wherein a belt-shaped part (2F) that radially protrudes by a protrusion amount (P1) is formed over a prescribed width (W1) in the outer peripheral surface of the outer member (2) so that at least part of the belt-shaped part (2F) radially overlaps the outside rolling surface (2D) which is on the vehicle-wheel-attachment-flange-facing side of the outer member (2). |
