| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel bearing deice having improved strength and durability while solving conflicting issues of constructing the device to be lighter and more compact and to be more rigid. SOLUTION: The wheel bearing device comprises double-row rolling element trains, and an inner ring 6 axially fixed with a caulked portion 13c formed by plastically deforming the end of a small diameter stepped portion 13b of a hub ring 13 outward in the radial direction. The rolling element train on the outer side consists of tapered rollers 9, and the rolling element train on the inner side consists of balls 10. A pitch circle diameter PCDo of the tapered roller train 9 on the outer side is set to be smaller than a pitch circle diameter PCDi of the ball train 10 on the inner side, and the number of the tapered rollers 9 is set to be the same as that of the balls 10. This suppresses the degradation of the rigidity of the bearing train on the outer side and reduces the pitch circle diameter PCDo to reduce the contact area of the tapered rollers 9 and reduce bearing torque while actualizing lighter and more compact construction. COPYRIGHT: (C)2008,JPO&INPIT
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