| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for a wheel, capable of solving the conflicting problems: one is to make the device light and compact, and the other is to make it highly rigid. SOLUTION: In this bearing device for the wheel in which a prescribed hard layer 16 is formed on the periphery of a small diameter step 5b from the base part 7c of a wheel mounting flange 7 by induction hardening, and an inner ring 6 is fixed by a caulking part 9, the pitch circle diameter PCDi of an inner side tapered roller 4 is set smaller than the pitch circle diameter PCDo of an outer side tapered roller, a cone-shaped recess 15 is formed at the end part on the outer side of a hub ring 5, its depth extends beyond the groove bottom part of the inside rolling surface 5a of the hub ring 5 and reaches the vicinity of a shaft-shaped part 8, the wall thickness t1 on the larger diameter side on the inside rolling surface 5a is set thicker than the wall thickness t2 of the center part, the wall thickness t1, t2 are set to be in the range of 0.2-0.3 of the diameters d1, d2 of these parts, and are also set to be not less than two times of the effective hard layer thickness in the hard layer 16. COPYRIGHT: (C)2008,JPO&INPIT
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