Patent ID: 6921080
Filing Date: 2005-07-26
Classification: F16J

Abstract:
1. A shaft sealing ring for a shaft comprising the following features: (a) the shaft sealing ring includes a sealing lip made of an elastomer; (b) the sealing lip is flexible, its flexural elasticity being chosen just sufficient to press a sealing portion of the sealing lip into sealing engagement with the surface of the shaft; (c) the sealing portion of the sealing lip engages the periphery of the shaft for a predetermined length; (d) at least throughout the length mentioned, the sealing lip is provided with a thread at the side facing the shaft to return exiting medium during rotation of the shaft to the space to be sealed; (e) the shaft sealing ring does not include a spring; and (f) the thread is blocked towards the surroundings wherein the ratio between the engaging length of the sealing portion and the pitch of the thread is at least 2.0.