BEARING DEVICE FOR WHEEL AND METHOD FOR MANUFACTURING THE SAME

摘要

A bearing device for a wheel has double-row rolling bodies (5) interposed between opposite raceway surfaces (3, 4) of an outer member (1) and an inner member (2). The inner member (2) consists of a hub ring (9) and an inner ring (10) fitted to the outer periphery of an inboard-side portion of the hub ring (9). An annular step (16) is provided at the inner peripheral edge of the inboard side end of the inner ring (10), and a staked portion (9b) engaging with an inclination surface (16a), inclined to the axial direction, of the step (16) of the inner ring (10) is provided at the inboard side end of the hub ring (9). The staked portion (9b) is a diameter-expanded portion formed by pushing a staking punch from the inboard side into the inner periphery of a plastic deformation part. The plastic deformation part is located at the inboard side end of the hub ring (9) and has a tubular shape before it is staked. In pushing in the staking punch, the amount of variation of the inner diameter of the inboard side end of the plastic deformation portion is set within a predetermined range, and this limits the amount D of swelling of the staking portion (9b) toward the outer diameter side. Alternatively, the maximum inner diameter of a tapered inner peripheral surface of the plastic deformation portion is set within a predetermined range, and this limits the amount of swelling of the staking portion (9b) to the outer diameter side.