Low-friction seal
AssigneeHerbert Hanchen KG
InventorsHerbert Busse, Hans-Dieter Fabrowsky
Life of this patent
Estimating the term…
Abstract
A low-friction seal comprising a quasi dimensionally stable sealing ring (44) that is accommodated with radial and axial clearance in a groove (30; 76) of one of two surface, whereby said surfaces are sealed off from each other and can move in a relative position to each other, and the peripheral section of the sealing ring protruding from the groove (30′ 76) is placed opposite the other surface that is to be sealed. Means are provided between the side wall (34; 80, 82) of the groove on the side of the pressure-chamber and the sealing ring (44) in order to prevent pressure from spreading to the bottom (37, 78) of the groove, whereby radial deformation of the sealing ring in the direction of the surface that is to be sealed is avoided.
Claims9
A low friction seal assembly comprising:
- a) a guide element for guiding a shaft, said guide element having a groove extending therein, said groove having a bottom wall and a first side wall;
- b) a sealing ring, said sealing ring received within said groove, said sealing ring having a cylindrical inner surface adapted to be positioned adjacent a shaft surface to be sealed, an end face disposed adjacent said groove first side wall and an outer cylindrical surface disposed adjacent said groove bottom wall;
- and
- c) a seal, said seal disposed between said sealing ring end face and said groove first side wall so that when said seal is subjected to a pressure medium, propagation of the pressure medium is caused to take place only between said cylindrical inner surface of said sealing ring and the shaft surface to be sealed with a substantially continuous decrease in pressure occurring along the length of said sealing ring.
Dependencies are inferred from the claim text.