Hydrodynamic backup ring
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United States of America Patent
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Aug 18, 2015
Grant Date -
Feb 16, 2012
app pub date -
Feb 11, 2011
filing date -
Feb 11, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A seal backup ring is provided with undulating surfaces which create circumferential convergence with a relatively rotatable surface. The backup ring is configured so that differential pressure acting across a rotary seal forces portions of the backup ring against the relatively rotatable surface, closing, or substantially closing, the extrusion gap that the rotary seal is exposed to. In response to relative rotation between the backup ring and the mating relatively rotatable surface, the circumferential convergence promotes hydrodynamic lubrication within the dynamic interface that exists between the backup ring and the relatively rotatable surface. The modulus of elasticity of the backup ring is greater than the modulus of elasticity of the rotary seal.
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