Patent ID: 11773980

Abstract:
Provided is a sealing device capable of exhibiting a screw pumping effect in an early stage while inhibiting leakage of a fluid to be sealed by providing thread protrusions. A second inclined surface is provided with a plurality of first thread protrusions that cause a fluid to be sealed to flow toward a region to be sealed when the seal lip rotates in one direction relative to a shaft, and a plurality of second thread protrusions that cause the fluid to be sealed to flow toward the region to be sealed when the seal lip rotates in another direction relative to the shaft. In a state before progress of sliding wear on the seal lip, a sidewall of each of the first thread protrusions on a side facing the region to be sealed and a sidewall of each of the second thread protrusions on the side facing the region to be sealed are both designed to be parallel to a center axis line of the shaft in a state in which the seal lip is in contact with a surface of the shaft.