| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing unit for a wheel capable of preventing falling of a flange part generated by pressure-fitting of a bolt. SOLUTION: In the rolling bearing unit for the wheel, a disc rotor of a disc brake device is fixed to the flange part 12 by the bolt 14 pressure-fitted to a through hole 13 provided on the flange part 12 of an inner shaft part. A distribution variation surface 10 is formed on an inner peripheral surface of the through hole 13. The distribution variation surface 10 makes surface pressure distribution generated on the inner peripheral surface of the through hole 13 by the pressure-fitted bolt 14 to unequal distribution having an axial center of gravity position at an almost plate thickness central part of the flange part 12. COPYRIGHT: (C)2006,JPO&NCIPI
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