Seal for a joint or juncture – Seal between relatively movable parts – Circumferential contact seal for other than piston
Reexamination Certificate
2009-06-08
2011-11-15
Patel, Vishal (Department: 3674)
Seal for a joint or juncture
Seal between relatively movable parts
Circumferential contact seal for other than piston
Reexamination Certificate
active
08056904
ABSTRACT:
A hydrodynamically lubricating geometry for the generally circular dynamic sealing lip of rotary seals that are employed to partition a lubricant from an environment. The dynamic sealing lip is provided for establishing compressed sealing engagement with a relatively rotatable surface, and for wedging a film of lubricating fluid into the interface between the dynamic sealing lip and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or the counter-clockwise direction. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive to efficient hydrodynamic wedging. Skewed elevated contact pressure zones produced by compression edge effects provide for controlled lubricant movement within the dynamic sealing interface between the seal and the relatively rotatable surface, producing enhanced lubrication and low running torque.
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Dietle Lannie L.
Schroeder John E.
Andrews & Kurth LLP
Kalsi Engineering, Inc.
Patel Vishal
Rommelmann Douglas W.
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