Sealing device

Patent metadata

Field	Value
Publication number	US-10267422-B2
Application number	US-201615540470-A
Country	US
Kind code	B2
Filing date	Jan 6, 2016
Priority date	Jan 8, 2015
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

The invention provides a sealing device which can suppress occurrence of static leakage and has a seal lip and a seal flange which are slidably in contact with each other, and a screw groove arranged in an end face, in an axial direction, of the seal flange. In the sealing device, the seal lip attached to a non-rotational housing side is slidably in contact with the end face, in the axial direction, of the seal flange on the rotational axis side, and which has the screw groove arranged in the end face, in the axial direction, of the seal flange so as to exert a fluid pumping action during rotation, is characterized in that the screw groove has an inner-circumferential-side inclined surface and an outer-circumferential-side inclined surface as the internal surfaces, and has a groove bottom part in a circular arc cross-sectional shape that interconnects both of the inclined surfaces.

First claim

What is claimed is:

1. A sealing device comprising:
a seal lip fitted on a non-rotating housing side;
a seal flange on a rotating shaft side;
the seal lip being configured to be slidably brought into contact with an axial-direction end surface of the seal flange; and
a screw groove providing a fluid pumping action at a time of rotation, and disposed in the axial-direction end surface of the seal flange,
wherein the screw groove includes an inner surface including an inner-peripheral side slope and an outer-peripheral side slope, and the inner surface further includes a groove bottom portion having an arcuate cross section connecting both the slopes to each other, and
a width of the screw groove is sized such that, during the time of rotation, a terminal end of the seal lip is intermittently entirely received within the screw groove.

2. The sealing device according to claim 1 ,
wherein a radius of curvature of an arc shape of the groove bottom portion having the arcuate cross section is set to be greater than a groove depth of the screw groove.

3. The sealing device according to claim 2 , wherein the radius of curvature is greater than the groove depth and minimizes formation of a pocket between the seal lip and the inner peripheral side slope when the terminal end of the seal lip is intermittently entirely received within the screw groove.

Assignees

• Nok Corp

Inventors

• Yamaguchi Yoshihisa
• Hyakutake Hideharu
• Sakano yuya

Classifications

• F16J15/3456

  without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip · CPC title

• F16J15/3264

  the elements being separable from each other · CPC title

• F16J15/164 Primary

  the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid · CPC title

• F16J15/3204

  with at least one lip · CPC title

• F16J15/3244

  with hydrodynamic pumping action · CPC title