| 摘要 |
PROBLEM TO BE SOLVED: To prevent quench cracks of an outer race in induction hardening, and easily implement weight reduction and compactification of an end product. SOLUTION: The wheel bearing device comprises: the outer race 4 having a vehicle body mounting flange 12 mounted to a vehicle body, and double rows of raceway surfaces 10, 11 formed on its inner periphery; a hub wheel 1 and an inner race 2 having a vehicle body mounting flange 6 to which a wheel is mounted, and raceway surfaces 5, 9 opposed to the raceway surfaces 10, 11 of the outer race 4 formed on their outer peripheries; and double rows of rollers 3 interposed between raceway surfaces of the outer race 4, hub wheel 1, and inner race 2. The raceway surfaces 10, 11 of the outer race 4 are hardened by the induction hardening to form hardened layers 16, 17 on the raceway surfaces 10, 11. A ratio D/T of an effective hardened layer depth D to thickness T in a bottom groove part of at least one raceway surface 11 of the outer race 4 is 0.49 or more. COPYRIGHT: (C)2005,JPO&NCIPI
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