| 摘要 |
A vehicle wheel bearing apparatus which reduces weight, size and number of parts prevents ingress of rain water or dusts and leakage of differential gear oil is structured as a unit with a wheel hub ( 1,14 ) and a double row rolling bearing ( 2, 15 ). An inner member ( 3, 16 ) includes the wheel hub ( 1, 14 ) integrally formed with a wheel mounting flange ( 6 ) on one end. The wheel hub inner circumferential surface includes a serration ( 8 ). An axially extending cylindrical portion ( 7 ) extends from the flange ( 6 ). One or more inner rings ( 10 ) are press-fit onto the cylindrical portion ( 7 ) of the wheel hub ( 1, 14 ). The inner rings are formed on their outer circumferential surface with at least one of the inner raceway surfaces ( 10 a). An outer member ( 4 ) is arranged around the inner member ( 3, 16 ). The outer member ( 4 ) is formed with double row outer raceway surfaces ( 4 a) on its inner circumferential surface opposite to the inner raceway surfaces ( 10 a). Double row rolling elements ( 5 ) are arranged between the inner and outer raceway surfaces ( 10 a , 4 a) of the inner member ( 3, 16 ) and the outer member ( 4 ). A cage ( 11 ) freely rollably holds the rolling elements ( 5 ). Seals ( 12 ) seal an annular space between the inner member ( 3, 16 ) and the outer member ( 4 ). A partition wall ( 9 ) is integrally formed on the wheel hub ( 1, 14 ), at its outboard side, to close a central bore of the wheel hub ( 1, 14 ).
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