| 摘要 |
PROBLEM TO BE SOLVED: To provide an in-wheel motor drive unit further improved in vehicle riding comfort and driving stability. SOLUTION: This in-wheel motor drive unit 21 includes a casing 22, a motor portion A, a deceleration portion B, a wheel hub 32 and a wheel hub bearing 33. The wheel hub bearing 33 is a ball bearing made of ceramic and having a plurality of rollers 33e. COPYRIGHT: (C)2008,JPO&INPIT
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