BEARING FOR WHEEL, AND BEARING DEVICE FOR WHEEL

摘要

A bearing device for a wheel has a bearing including an outer race having double-row outer raceway surfaces formed on an inner circumference thereof, a hub wheel and an inner race having double-row inner raceway surfaces formed on an outer circumference thereof so as to be opposed to the outer raceway surfaces, and double-row rolling elements interposed between the inner and outer raceway surfaces. The bearing has a constant velocity universal joint coupled thereto with a screw fastening structure by fitting a stem section of an outer joint member to a shaft hole of the hub wheel, in which the shaft hole of the hub wheel is formed by penetrating the hub wheel into a cylindrical shape over an axial direction of the hub wheel.

主权项

1. A bearing device for a wheel, comprising a bearing for a wheel comprising:
an outer member having double-row outer raceway surfaces formed on an inner circumference thereof; an inner member comprising a hub wheel and an inner race, the inner member having double-row inner raceway surfaces formed on an outer circumference thereof so as to be opposed to the double-row outer raceway surfaces; and double-row rolling elements interposed between the double-row outer raceway surfaces of the outer member and the double-row inner raceway surfaces of the inner member, the bearing for a wheel having a constant velocity universal joint coupled thereto with a screw fastening structure by fitting a stem section of an outer joint member of the constant velocity universal joint to a shaft hole of the hub wheel, wherein the shaft hole of the hub wheel is formed by penetrating the hub wheel into a cylindrical shape over an axial direction of the hub wheel, wherein the outer joint member comprises a plurality of convex portions formed on an outer circumferential surface of the stem section thereof so as to extend in the axial direction, wherein the hub wheel comprises a plurality of concave portions formed on an inner circumferential surface of the shaft hole thereof by broaching so as to have interferences with the plurality of convex portions, respectively, and wherein the stem section of the outer joint member is press-fitted to the shaft hole of the hub wheel, and a shape of each of the plurality of convex portions is transferred to the inner circumferential surface of the shaft hole, to thereby define a convex and concave fitting structure in which the plurality of convex portions and the plurality of concave portions are brought into close contact with each other at an entire fitting contact portion therebetween.