US 2022/0186838 A1Published application

Sealing device

AssigneeNok Corporation

InventorYuto MANAKA

Life of this patent

Estimating the term…

Loading patent…

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.

Claims1

Dependent claims

A sealing device comprising a seal lip that is configured to slide on a surface of a shaft that rotates relative to the sealing device,

the seal lip having a lip end formed of a first inclined surface radially expanding toward a region to be sealed and a second inclined surface radially expanding toward an opposite side to the region to be sealed,
the second inclined surface being provided with a plurality of first thread protrusions that is configured to cause a fluid to be sealed to flow toward the region to be sealed when the seal lip rotates in one direction relative to the shaft, and a plurality of second thread protrusions that is configured to 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, and
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 both being configured 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.

Dependencies are inferred from the claim text.