| 摘要 |
A seal ( 10 ) for sealing the interface between a shaft ( 12 ) and a bore-defining wall ( 14 ) of a surrounding part ( 16 ). The seal ( 10 ) comprises a sleeve ( 20 ) for movement (or nonmovement) with the shaft ( 12 ), a case ( 30 ) for movement (or nonmovement) with the surrounding part ( 16 ), a bumper lip ( 40 ), a dirt lip ( 42 ), and a primary lip ( 44 ). A drain passage ( 60 ) continuously empties a potentially contaminant-accumulating chamber ( 50 ) between the bumper lip ( 40 ) and the dirt lip ( 42 ) thereby circumventing any contaminant ingress towards the primary lip ( 44 ).
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