| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel supporting bearing device with a hub wheel or an outer ring whose crack is suppressed when manufactured by press molding of a steel plate. SOLUTION: The wheel supporting bearing device comprises the hub wheel 2 to be rotated integrally with a wheel, a number of rolling elements 7 for rolling in an inner ring raceway groove 6 formed in the hub wheel 2 with the rotation of the hub wheel 2, and the outer ring 8 for rotatably supporting the hub wheel 2 via the rolling elements 7. At least one bearing member out of the hub wheel 2 and the outer ring 8 contains 0.45-0.75 mass% carbon. It is formed by press molding of a steel plate which has a plate thickness of 5 mm or more and which is subjected to softening annealing before press molding. COPYRIGHT: (C)2006,JPO&NCIPI
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