Rotary dampers
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Aug 29, 1997
filing date -
Sep 4, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A rotary damper has an inner member located within an outer member and an annular seal between the members enclosing a fluid-filled space bounded in part by mutually adjacent faces of the members. A viscous damping force is thereby generated by relative rotation of the members. The seal has a radially inner rim in sliding engagement with the inner member. A resilient flexible retainer held by the outer member bears on the seal inner rim, flexure of the retainer providing a predetermined axial sealing pressure on the rim. The seal includes a diaphragm portion exposed to atmospheric pressure and deformable to accommodate thermal expansion of the fluid in the sealed space.
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