Patent attributes
A hydrodynamically lubricating rotary seal for differential pressure acting in either axial direction that establishes compressed sealing engagement with a relatively rotatable surface and wedges a film of lubricating fluid into the interface between the rotary seal and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or counter-clockwise direction. A multi-function edge and angled flank of the hydrodynamic wave form are truncated by the lubricant end of the seal, improving the dynamic performance of the seal in circumstances where the pressure acting on the environment end of the seal is greater than the pressure acting on the lubricant end of the seal. This improvement is believed to be the result of reduced contact pressure, and reduced radial deformation of the wave form, compared to prior art seals.
