Shaft sealing ring

Details Shaft sealing ring Shaft sealing ring

2005-02-22

2005-02-22

Pickard, Alison (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

C277S559000, C277S560000

Reexamination Certificate

active

06857636

ABSTRACT:
A shaft sealing ring, comprising an elastic sealing lip which has a sealing edge in engagement with a circumferential surface of a shaft which rotates relative to the shaft sealing ring, further comprising at least two sinusoidally curved helical elements having the same amplitudes and wavelengths which are provided on a sealing lip surface facing the surroundings and serve to convey medium that has escaped to the side of the surroundings back over the sealing edge to the side of the medium of the shaft sealing ring, the helical elements being arranged phase-shifted with respect to each other in circumferential direction and merging tangentially in circumferential direction into the sealing edge is characterized in that the ratio between the wavelength L and the amplitude A of the sinusoidally curved helical elements fulfills the relationship

REFERENCES:
patent: 3640542 (1972-02-01), Mowat et al.
patent: 3868105 (1975-02-01), Bentley
patent: 4441722 (1984-04-01), Pichler
patent: 5190299 (1993-03-01), Johnston
patent: 5711534 (1998-01-01), Bengoa et al.
patent: 0 094 063 (1983-11-01), None

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