Patent ID: 8746985
Filing Date: 2014-06-10
Classification: B60B,F16C

Abstract:
1. A rolling bearing device for a wheel, said rolling bearing device comprising: a rotary ring comprising a flange including a plurality of arm portions formed with through holes to which hub bolts for fitting a brake rotor and a wheel of a vehicle are fixed, and extended radially outward in a radial direction, the brake rotor being secured by being butted against outer side surfaces of the arm portions directed to an outward side of the vehicle; a fixed ring which is fixed to a vehicle side and arranged concentrically with the rotary ring; and a plurality of rolling elements which are disposed between the rotary ring and the fixed ring so as to freely roll, wherein inner side surfaces of the arm portions directed to an inward side of the vehicle are provided with thick wall parts which are formed thick by protruding further inward into the vehicle than bolt seat surfaces of the arm portions with which head parts of the hub bolts are contacted, said thick wall parts extending from the rotary ring radially outwardly along side edges of the arm portions so as to surround radially inner portions of the head parts of the hub bolts, wherein each of the thick wall parts comprises: wherein a boundary between the base portion and the tip end portion and a boundary between the tip end portion and said one of the bolt seat surfaces extend circumferentially around the radially inner portion of the head part of the hub bolt in a plan view.