Patent ID: 6857636

Claim:
A shaft sealing ring, comprising an elastic sealing lip ( 1 ) which has a sealing edge ( 3 ) in contact with a circumferential surface ( 2 ) of a shaft which rotates relative to the shaft sealing ring, further comprising at least two sinusoidally curved helical elements ( 4 ) having 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 (U) back over the sealing edge ( 3 ) to the side of the medium (M) of the shaft sealing ring, the helical elements ( 4 ) being phase-shifted with respect to each other in circumferential direction (u) and merging tangentially in circumferential direction into the sealing edge, characterized in that the ratio between the wavelength L and the amplitude A of the sinusoidally curved helical elements ( 4 ) fulfills the relationship 12.5<L/A<90 and as seen in axial direction (a), the helical elements ( 4 ) merge tangentially into a rounded portion (r) of the sealing edge.