Sealing device

Patent metadata

Field	Value
Publication number	US-2016334017-A1
Application number	US-201415112041-A
Country	US
Kind code	A1
Filing date	Nov 11, 2014
Priority date	Jan 16, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

A sealing device suppresses deterioration of sealing properties due to plastic deformation (settling) of an outer circumferential lip, including a packing ( 10 ) having an outer circumferential lip ( 12 ) provided on a sealed fluid side and an inner circumferential lip ( 13 ) on an inner circumferential side, and a metal spring member ( 20 ) mounted in a mounting groove ( 11 ) and having an outer circumferential pressing portion ( 21 ) that extends radially outward and toward the sealed fluid side from a groove bottom of the mounting groove ( 11 ) and presses the outer circumferential lip ( 12 ) radially outward, and an inner circumferential pressing portion ( 22 ) that extends radially inward and toward the sealed fluid side from the groove bottom of the mounting groove ( 11 ) and presses the inner circumferential lip ( 13 ) radially inward. Among the outer circumferential lip ( 12 ) and the inner circumferential lip ( 13 ), a protrusion ( 13 a ) for preventing the spring member ( 20 ) from coming off is provided only on the inner circumferential lip ( 13 ).

First claim

What is claimed is:

1 . A sealing device for sealing an annular gap between a shaft and a housing comprising:
a packing made of resin having an outer circumferential lip on an outer circumferential side with respect to an annular mounting groove provided on a sealed fluid side and an inner circumferential lip on an inner circumferential side with respect to the annular mounting groove; and a metal spring member mounted in the mounting groove and having an outer circumferential pressing portion extending radially outward and toward the sealed fluid side from a groove bottom of the mounting groove and pressing the outer circumferential lip radially outward, and an inner circumferential pressing portion extending radially inward and toward the sealed fluid side from the groove bottom of the mounting groove and pressing the inner circumferential lip radially inward, wherein, among the outer circumferential lip and the inner circumferential lip, a protrusion that prevents the spring member from coming off is provided only on the inner circumferential lip.

2 . The sealing device according to claim 1 , wherein a thickness of the outer circumferential lip in a thinnest portion thereof on a proximal end side from a portion thereof with a largest outer diameter is smaller than a thickness of the inner circumferential lip in a thinnest portion thereof on a proximal end side from a portion thereof with a smallest inner diameter.

3 . The sealing device according to claim 1 , wherein the outer circumferential lip extends toward the sealed fluid side and beyond a distal end of the outer circumferential pressing portion of the spring member mounted in the mounting groove, and a length of the outer circumferential lip in an axial direction is shorter than the inner circumferential lip.

4 . The sealing device according to claim 2 , wherein the outer circumferential lip extends toward the sealed fluid side and beyond a distal end of the outer circumferential pressing portion of the spring member mounted in the mounting groove, and a length of the outer circumferential lip in an axial direction is shorter than the inner circumferential lip.

Assignees

• Nok Corp

Inventors

• Tadano Hikaru

Classifications

• F16J15/3212 Primary

  with metal springs · CPC title

• F16J15/3236

  with at least one lip for each surface, e.g. U-cup packings · CPC title

• F04B53/00

  Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00 · CPC title