Patent ID: 8690448

Claim:
A rolling bearing apparatus comprising: an outer ring member mounted on a vehicle fixing member of a vehicle inner side so as not to rotate, the outer ring comprising: a cylindrical outer ring main body portion which has an outer circumferential surface and an inner circumferential surface and in which a raceway surface is formed on the inner circumferential surface; and an outer ring flange portion which has a vehicle outer side end face and protruding radially outwards from the outer ring main body portion; an inner ring member mounted on a wheel side and disposed concentrically with the outer ring member; and a rolling element row comprising rolling elements arranged in a circumferential direction on the raceway surface between the inner ring member and the outer ring member, wherein a surface continuing from the vehicle outer side end face to the outer circumferential surface is formed as a smoothly continuing curved surface, wherein a protruding curved surface which protrudes radially outwards is formed on the curved surface, wherein the protruding curved surface comprises a protruding arc surface having a predetermined radius of curvature such that a curvature center is positioned further radially inwards than the outer circumferential surface of the outer ring main body portion, wherein the continuing curved surface comprises: an inner side arc surface which serves as a surface continuing from the vehicle outer side end face of the outer ring flange portion on the vehicle inner side and which has a predetermined radius of curvature such that a curvature center is determined on a radially outer side of the outer ring main body portion; an outer side arc surface which serves as a surface continuing from the outer circumferential surface of the outer ring main body portion on the vehicle outer side and which has a predetermined radius of curvature such, that a curvature center is determined on a radially outer side of the outer ring main body portion; and the protruding curved surface, and wherein the radius of curvature of the protruding curved surface is set larger than the radii of curvatures of the outer side arc surface and the inner side arc surface.