| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for a wheel having solved the contradictory problems of reduction in the weight and size of the device and its higher rigidity, and having enhanced strength and durability. SOLUTION: This bearing device for a wheel comprises double rows of tapered rollers 9, 10. An inner ring 6 is fixed by swinging and caulking the end of the small diameter step part 13b of a hub wheel 13. The pitch circle diameter PCDi of the inner row of tapered rollers 10 is set larger than the pitch circle diameter PCDo of the outer row of tapered rollers 9. The numbers of the rollers of the double rows of tapered rollers are set to the same value. The roller diameter di of the inner row of tapered rollers 10 is set larger than the roller diameter do of the outer row of tapered rollers 9. The roller length Lo of the outer row of tapered rollers 9 is set longer than the roller length Li of the inner row of tapered rollers 10. Consequently, the rigidity and the life of the bearing can be enhanced, and the weight and size of the bearing can be reduced by effectively utilizing a bearing space. COPYRIGHT: (C)2008,JPO&INPIT
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