BEARING DEVICE FOR WHEEL

摘要

A bearing device for a wheel, in which circumferential play and axis misalignment are suppressed and which can be produced at low cost. In the bearing device, a hub ring (1), a double-row rolling bearing (2), and a constant velocity universal joint (3) are unitized, an outer joint member of the universal joint (3) has a mouth section (11) into which an inner joint member is fitted, and a preload is applied to an inner ring (24) of a rolling bearing (2) that is fitted on the hub ring (1) by staking an end of the hub ring (1). The bearing device further has a depression-projection fitting structure (M) where a hub ring corresponding surface (40) of the mouth section (11) of the outer joint member and an end staking section (31) of the hub ring (1) are united together. Radially extending projections (41) having higher hardness than the end staking section (31) of the hub ring (1) are formed on a bottom wall (12) of the mouth section (11). Further, radially extending depressions (42) fitting to the projections (41) are formed in the end staking section (31) of the hub ring (1), and the depressions (42) are fitted to the projections (41) on the mouth section side when the projections (41) are pressed to the end staking section (31) of the hub ring (1). In the depression-projection fitting structure (M), the entire contact and fitting areas of the projections (41) and the depressions (42) are in intimate contact with each other.