| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel bearing device having improved strength and durability while solving conflicting issues of constructing the device to be lighter and more compact and to be more rigid at the same time. SOLUTION: The wheel bearing device comprises double-row tapered roller trains 9, 10. Pitch circle diameters of the double row tapered roller trains 9, 10 are set to be the same, a roller diameter do of the tapered roller train 9 on the outer side is set to be smaller than a roller diameter di of the tapered roller train 10 on the inner side, the roller number of the tapered roller train 9 on the outer side is set to be greater than the roller number of the tapered roller train on the inner side, and the length Li of the tapered roller train 10 on the inner side is set to be greater than the length Lo of the tapered roller train 9 on the outer side. This increases basic rated loads of both bearing trains without increasing the pitch circle diameter PCDo of the tapered roller train 9 on the outer side and improves the rigidity and life of the bearing while achieving lighter and more compact construction. COPYRIGHT: (C)2008,JPO&INPIT
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