| 摘要 |
A sealing device for a bearing of the hub of a motor vehicle wheel comprising a stationary race ( 1 ) and a rotatable race ( 2 ), each defining respective channels ( 6, 7 ) for the passage of pressurized air. The sealing device ( 20 ) is to be mounted between the rotatable race and the stationary race in order to delimit laterally and hermetically seal an annular space or chamber ( 14 ) defined between the bearing races ( 1, 2 ) and communicating with the channels ( 6, 7 ). The sealing device ( 20 ) comprises two sealing units ( 9 ) axially facing one another. Each sealing unit ( 9 ) comprises an annular reinforcement ( 10 ) having an axial cylindrical wall ( 10 a) for mounting to a first bearing race ( 1 ) and a radial wall ( 10 b) for reinforcing a flexible gasket ( 11 ). The two sealing units ( 9 ) are coupled by means of an annular element ( 21 ) having a plurality of radial air passages ( 22 ). The annular element ( 21 ) is located coaxially and forcefully coupled with radial interference with the cylindrical walls ( 10 a) of the two reinforcements ( 10 ). The cylindrical walls ( 10 a) of the two reinforcements are axially spaced from one another for allowing pressurized air to flow through the passages ( 22 ) of the annular element ( 21 ). |
