| 摘要 |
A bearing device for a wheel, in which hoop stress acting in outer diameter sections of inner rings is reduced to achieve sufficient bearing strength without radially or laterally increasing the wall thickness of the inner ring. The bearing device has double-row rolling bodies (5) placed between raceway surfaces (3, 4) of an outer member (1) and an inner member (2). The inner member (2) has a hub ring (9) with a solid shaft section (9b) and a flange (9a), and also has two inner rings (10A, 10B) press fitted on the outer periphery of the shaft section (9b) of the hub ring (9) and having outboard side and inboard side raceway surfaces (4), respectively. A hole (9d) in an inboard side end face of the shaft section (9b) of the hub ring (9), and an end face of the inner ring (10B) on the inboard side is axially fastened by a staking section (9e) formed by staking a circular tubular section on the outer periphery of the hole (9d) to the outer diameter side of the circular tubular section. The position of the bottom surface of the hole (9d) of the hub ring (9) is closer to the inboard side than a position (P1) at which a line (L1) intersects with the surface of fitting between the outer peripheral surface of the hub ring (9) and the inner ring (10B), where the line (L1) is a line extended from the axial center of the raceway surface (4), which belongs to the inner ring (10B) on the inboard side, in the direction normal to the inboard side to the raceway surface (4) of the inner ring (10B). Also, the position of the bottom surface of the hole (9d) is closer to the outboard side than the end face on the inboard side of the inner ring (10B). |
