Dynamic Lay Down Lip Seal With Bidirectional Pumping Feature
AssigneeFreudenberg-NOK General Partnership
InventorAlexander BERDICHEVSKY
Life of this patent
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Abstract
A dynamic lip seal is provided for sealing between a housing and a shaft and with a fluid medium to be sealed on an oil side and air on an air side of the seal. The seal includes a seal lip extending from a seal body and including a shaft contact portion adapted for engagement with the shaft and including a static band and a first set of spiral grooves disposed on an oil side of the static band, and a second set of spiral grooves on an air side of the static band. The first and second sets of spiral grooves are both configured to pump oil toward the static band when the shaft is rotated in a first direction, and the first and second sets of spiral grooves are both configured to pump oil away from the static band when the shaft is rotated in a second direction.
Claims10
A dynamic lay down lip seal for sealing between a housing and a shaft and with a fluid medium to be sealed on an oil side and air on an air side of the seal, comprising:
- a seal body adapted to be received in a bore in the housing;
- and
- a seal lip extending from the seal body and including a shaft contact portion adapted for engagement with the shaft and including a static band defining an annular region that continuously contacts the shaft around a circumference of the shaft and including a first set of spiral grooves disposed on an oil side of the static band, and a second set of spiral grooves on the air side of the static band, the first and second sets of spiral grooves both being configured to pump oil toward the static band when the shaft is rotated in a first direction, and the first and second sets of spiral grooves both being configured to pump any oil therein away from the static band when the shaft is rotated in a second direction.
Dependencies are inferred from the claim text.