| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device which is highly rigid as well as made light/compact while improving the life of a bearing. <P>SOLUTION: A pitch circle diameter PCDi of a ball group 4 located far from a wheel mounting flange 7, out of double row ball groups 3, 4, is set to be larger than a pitch circle diameter PCDo of the ball group 3 located close to the wheel mounting flange 7. A ball diameter di of the ball group 4 located far from the wheel mounting flange 7 is set to be larger than a ball diameter do of the ball group 3 located close to the wheel mounting flange 7, the ball number of the former is set to be more than that of the latter. A mortary recessed portion 14 is formed in the end of a hub ring 5 on the side of the wheel mounting flange 7. The depth of the mortary recessed portion 14 ranges approximately over at least an inside rolling face 5a of the hub ring 5, and the shell of the hub ring 5 is shaped with its thickness approximately uniform corresponding to the recessed portion 14. This solves problems on the device which has a longer life and is lighter/compacter as well as highly rigid. <P>COPYRIGHT: (C)2008,JPO&INPIT |
