Patent ID: 6056292
Filing Date: 2000-05-02
Classification: F16J

Abstract:
A shaft seal for sealing a shaft in a hydraulic steering valve, said shaft being centered on a longitudinal axis and having a cylindrical outer surface, said shaft seal comprising:a sealing ring surrounding the shaft;said sealing ring having a sealing edge contacting the outer surface of the shaft to form a seal, said sealing edge extending circumferentially around the outer surface of the shaft in a sinusoidal fashion and forming said seal entirely around the outer surface of the shaft,said sealing ring having first and second surfaces which extend radially outward from said sealing edge and which diverge relative to each other as they extend radially outward from said sealing edge, said first and second surfaces extending entirely circumferentially around the outer surface of the shaft,said first surface extending at a constant first angle relative to said sealing edge throughout the entire circumferential extent of said first surface and said second surface extending at a constant second angle relative to said sealing edge throughout the entire circumferential extent of said second surface,said sealing ring having a first cylindrical portion projecting axially away from said first surface in a first direction and a second cylindrical portion projecting axially away from said second surface in a second direction opposite to said first direction, said first and second cylindrical portions being spaced radially from the outer surface of the shaft.