| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for a vehicle capable of maintaining/improving the fatigue strength and attaining a weight reduction in a hub wheel, while maintaining the fixing properties of a hub bolt. SOLUTION: The bearing device for a vehicle is equipped with the hub wheel 2 having a wheel mounting flange 12 on the outer periphery of the outboard side end. The outer diameter side thickness of the flange 12 is made thinner than the center side by the slope of the inboard-side side face in the cross section between the base end thick part 13a and the hub bolt mounting part 13b of the outer diameter edge in the flange 12. The slope shape on the inboard-side side face is made into a two-step slope shape which connects the slope face 13aa on the center side to an outer side slope face 13ab having more gentle slope than the center side slope with a connecting circular surface 13ac having a circular cross section. At least, connecting circular face 13ac in the inboard-side side face is subjected to a high-frequency heat treatment to be hard-faced surface 13c. The periphery of the hub bolt mounting part 13b does not use a hard-faced surface 13c, but uses a raw material or a high-frequency annealed surface instead. COPYRIGHT: (C)2005,JPO&NCIPI
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