| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel bearing device in a fourth-generation structure having a reduced weight and a compact figure as well as higher rigidity and improved durability, and to provide an axle module equipped therewith. SOLUTION: The wheel bearing device comprises an outside joint member 14 fixed to a hub ring 1 in the axial direction with a caulked part 13 in such a manner that the end of a shaft part 20 of the outside joint member 14 is plastically deformed outward to the radial direction and caulked to the end face of the hub ring 1. Herein, a pitch circle diameter PCDi of a ball 6b on the inner side of double-raw balls 6a, 6b is set to be larger than a pitch circle diameter PCDo of the ball 6a on the outer side, the double-raw balls 6a, 6b have the same size, and the number of balls 6b on the inner side is set to be greater than the number of the balls on the outer side. This results in an reduced weight and a compact figure while increasing the rigidity and life of a bearing. COPYRIGHT: (C)2007,JPO&INPIT
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