| 摘要 |
A hub-bearing unit ( 10 ) has a rotatable outer race ( 30 ) fixable to a wheel and an inner stationary hub ( 20 ) forming a passage ( 27 ) for pressurized air coming from a source of pressurized air mounted onboard of a vehicle. Tightly fitted on the axially outer side of the unit ( 10 ) is a cylindrical cover ( 50 ) defining with the unit ( 10 ) an airtight chamber ( 51 ) communicating with the passage ( 27 ). The cover ( 50 ) has a through bore ( 55 ) for establishing air communication between the chamber ( 51 ) and a tube (A, B) for conveying pressurized air to the tire. The cover has an outer wall ( 52 ) with a cylindrical portion ( 52 b) axially protruding beyond the hub-bearing unit ( 10 ) so as to provide a cylindrical surface for centering the wheel of the vehicle.
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