| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for wheel support, having long service life, cost effectiveness and high reliability. SOLUTION: This bearing device for wheel support is equipped with an inner bearing washer 2 having raceway surfaces 7, 9 on the outer face; an outer bearing washer 4 which has raceway surfaces 15, 16 on the inner face opposing to the raceway surfaces 7, 9 of the inner bearing washer 2, and arranged outside the inner bearing washer 2; and a rolling element 5 rotatably arranged between the raceway surfaces 7, 9 and the raceway surfaces 15, 16. The rolling element 5 has a friction coefficient lower than those of the inner and outer bearing washers 2, 4, and is formed of steel at least containing 0.4 to 2.0 wt.% of Si. The amount of retained austenite on a surface layer of the bearing washer 4 and the amount of retained austenite on a surface layer of the rolling element 5 total 10 to 30 vol.%. On the surface of the rolling face of the rolling element 5, a carbonitriding layer having 0.3 to 2.0 wt.% of nitrogen concentration is formed. COPYRIGHT: (C)2006,JPO&NCIPI
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