| 摘要 |
A bearing device for a wheel is provided with a bearing (20) for a wheel, the bearing (20) comprising: an outer ring (5) which has double-row outer raceway surfaces (13, 14) formed on the inner periphery thereof; a hub ring (1) and an inner ring (2), which have double-row inner raceway surfaces (7, 8) formed on the outer peripheries thereof and facing the double-row outer raceway surfaces (13, 14); and rolling bodies (3, 4) which are arranged in double rows between the outer raceway surfaces (13, 14) of the outer ring (5) and the inner raceway surfaces (7, 8) of both the hub ring (1) and the inner ring (2). The stem (30) of the outer joint member (24) of a constant velocity universal joint (6) is fitted into the shaft hole of the hub ring (1), thereby joining the constant velocity universal joint (6) to the bearing (20) for a wheel by a thread fastening structure (M). The shaft hole (38) which has a circular cylindrical shape is provided in the hub ring (1) so as to penetrate therethrough in the axial direction. Grooves (39) which are fitted with interference to the ridges (37) of the stem (30) of the outer joint member (24) are formed by broaching in the shaft hole (38) of the hub ring (1). The stem (30) of the outer joint member (24) is press-fitted into the shaft hole of the hub ring (1), transferring the shape of the ridges (37) to the shaft hole, and as a result, a ridge-groove fitting structure in which the entire fitting contact portion of each of the ridges (37) and the entire fitting contact portion of a corresponding one of the grooves (39) are in close contact with each other is configured. |
