Patent ID: 9511629
Filing Date: 2016-12-06
CPC Classification: B60B,F16C,F16D,Y10T

Claim Text:
1. A bearing device for a wheel, the bearing device comprising: a hub wheel; a constant velocity universal joint; and a double-row roller bearing comprising: the hub wheel, the double-row roller bearing, and the constant velocity universal joint being unitized together, wherein a recess-projection fitting structure, in which the hub wheel and a shaft section of an outer joint member of the constant velocity universal joint are integrated with each other, is provided, the recess-projection fitting structure being configured such that projections, which are provided on one of an outer surface of the shaft section of the outer joint member and an inner surface of a hole of the hub wheel so as to extend in an axial direction, are press-fitted to another one of the outer surface of the shaft section and the inner surface of the hole along the axial direction, and that recesses, which intimately fit on the projections, are formed in the another one of the outer surface of the shaft section and the inner surface of the hole by the projections, and that entire regions of fitting contact regions between the projections and the recesses are brought into intimate contact with each other, wherein fitting between the inner race and a small diameter step section at an area corresponding to an outer surface side of the recess-projection fitting structure is non-interference fitting, and the fitting between the inner race and the small diameter step section at another area is interference fitting, and wherein a circumferential notch section is formed in an inner surface of the inner race in the area corresponding to the outer surface side of the recess-projection fitting structure, whereby the non-interference fitting is realized.