| 摘要 |
A vehicle wheel bearing apparatus has an outer member, an inner member and double row rolling elements freely rollably contained between the outer raceway surfaces and inner raceway surfaces, respectively, of the outer member and the inner member. Either one of the outer member or inner member, on its outer side end, is integrally formed with a wheel mounting flange to mount a wheel. A plurality of bolt apertures is formed in the wheel mounting flange. The wheel is secured on the wheel mounting flange by a plurality of bolts. Cut-out portions are formed between the bolt apertures. The cut-out portions avoid the vicinity of each bolt aperture. Each cut-out portion is formed with a circular arc configuration so that its deepest portion is positioned closely to a pitch circle diameter of the bolt apertures.
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