Patent ID: 9261145
Filing Date: 2016-02-16
CPC Classification: B60B,F16C,F16D

Claim Text:
1. A bearing device for a wheel, the bearing device comprising: a rolling bearing; and a constant-velocity universal joint having an outer joint member with a shaft section and a mouth section, wherein the rolling bearing comprises: the shaft section of the outer joint member of the constant-velocity universal joint is fit and coupled to an inner diameter of the hole of the hub wheel, one of the shaft section of the outer joint member and an inner diameter surface of the hole of the hub wheel has projections extending in an axial direction, the projections being press-fit into the other of the shaft section of the outer joint member and the inner diameter surface of the hole of the hub wheel along the axial direction, the other of the shaft section of the outer joint member and the inner diameter surface of the hole of the hub wheel has recesses that adhere to and fit on the projections, surfaces of the recesses being formed as cut surfaces by the projections cutting during the press fitting of the projections, the projections have press-fitting start end surfaces that contact, in the axial direction, a member having the recesses and being selected from the hub wheel and the shaft section of the outer joint member without penetration after the press-fitting, the recesses and the projections form a recess-projection fitting structure in which entire fitting contact regions of the projections and the recesses adhere to each other, the hub wheel has an end on an inboard side of the hub wheel that is caulked to an outer diameter side to form a caulking section, the inner ring of the rolling bearing is externally fit to the hub wheel and fixed by the caulking section, preload being applied to the rolling bearing, and the caulking section and a back surface of the mouth section of the outer joint member of the constant-velocity universal joint opposed to the caulking section are in contact with each other.