| 摘要 |
A vehicle wheel bearing apparatus has an outer member, an inner member with a wheel hub and inner ring, double row rolling elements contained between the inner member and the outer member, and; seals mounted between the outer member and the inner member. A stepped portion is formed between an inner side surface of the wheel mounting flange and its base. The stepped portion is formed with a circular arc cross-section with a predetermined radius of curvature. An annular recessed portion is formed on an inner circumference of the outer side end of the outer member. The recessed portion is arranged opposite to a corner edge of the stepped portion, via a small gap. The gap forms an annular labyrinth seal having a substantially“L”shaped cross-section.
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