Energy saving self-contact seal with pushing bead
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United States of America Patent
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Jul 25, 2017
Grant Date -
Aug 6, 2015
app pub date -
Feb 4, 2014
filing date -
Feb 4, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
An energy saving seal seals between a bore and a shaft for separating an oil side from an air side of the seal. The seal includes an annular mounting portion having a bellows portion extending axially and radially inward from the mounting portion. An axial leg extends axially from the bellows portion toward the air side. A lay down sealing lip extends radially inward and axially toward the oil side from an end of the axial leg. The sealing lip includes a bead on an outer surface. A dust lip extends from the end of the axial leg in a direction opposite the lay down sealing lip. When the oil side is under a negative pressure, the axial leg flexes inward in response to the negative pressure and engages the bead to provide a self-contact feature that holds the lay down sealing lip in engagement with the shaft.
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