| 摘要 |
PROBLEM TO BE SOLVED: To provide a hub unit bearing of an outer ring rotation type having simplified bearing construction for reducing the weight and cost of the bearing and improving the life of the bearing while reducing the pilot diameter of a hub flange. SOLUTION: The hub unit bearing 10 comprises an outside member 11 having the hub flange 14 at the end on the outside in a vehicle cross direction, an inside member 12 having a knuckle mounting flange 17 at the end on the inside in the vehicle cross direction, and rolling elements 13 rollingly arranged between the outside member 11 and the inside member 12. The inside member 12 has a shaft portion 16 on which an inner ring raceway surface 12a on the inside in the vehicle cross direction and the knuckle mounting flange 17 are formed, and an inner ring 19 which is fitted to the end of the shaft portion 16 on the outside in the vehicle cross direction and on which an inner ring raceway surface 12a on the outside in the vehicle cross direction is formed. The pitch circle diameter of a train of rolling elements 13 on the inside in the vehicle cross direction is larger than the pitch circle diameter of a train of rolling elements 13 on the outside in the vehicle cross direction. COPYRIGHT: (C)2009,JPO&INPIT
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