Sealing device

Patent metadata

Field	Value
Publication number	US-2016356381-A1
Application number	US-201515117928-A
Country	US
Kind code	A1
Filing date	Mar 6, 2015
Priority date	Mar 6, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

A sealing device has a seal ring, a first backup ring and a second backup ring. The first backup ring is formed into a triangular cross section while having an axially vertical end surface portion, a cylindrical peripheral surface portion, and an inclined surface portion intersecting the end surface portion and the peripheral surface portion. The second backup ring is formed into a triangular cross section while having an axially vertical end surface portion, a cylindrical peripheral surface portion, and an inclined surface portion in correspondence to the inclined surface portion of the first backup ring. A cut portion is provided in a corner portion where the end surface portion and the inclined surface portion in the first backup ring intersect, and a corner portion where the peripheral surface portion and the inclined surface portion in the second backup ring intersect.

First claim

1 . A sealing device arranged between two members facing to each other and sealing a sealed fluid,
wherein the sealing device comprises a seal ring which is installed to an installation groove provided in one member of said two members and comes into close contact with the other member, a first backup ring which is arranged in an opposite side to the sealed fluid in said seal ring and is comparatively hard, and a second backup ring which is arranged between said seal ring and said first backup ring and is comparatively soft, wherein said installation groove is formed into groove having a rectangular cross sectional shape, wherein said first backup ring is provided with an end surface portion which comes into contact with a side surface portion in an opposite side to the sealed fluid in said installation groove and is formed into an axially vertical surface, a peripheral surface portion which comes into contact with said other member and is formed into a cylindrical surface, and an inclined surface portion which intersects said end surface portion and said peripheral surface portion, and is formed into a triangular cross section, wherein said second backup ring is provided with an end surface portion which is brought into contact with said seal ring and is formed into an axially vertical surface, a peripheral surface portion which comes into contact with a bottom surface portion of said installation groove and is formed into a cylindrical surface, and an inclined surface portion which is provided in correspondence to the inclined surface portion of said first backup ring, and is formed into a triangular cross section, wherein a cut portion is provided in a corner portion where said end surface portion and said inclined surface portion in said first backup ring intersect, and wherein a cut portion is provided in a corner portion where said peripheral surface portion and said inclined surface portion in said second backup ring intersect.

2 . The sealing device according to claim 1 , wherein the cut portion provided in said first backup ring is cut in a direction which is parallel to a center axis of said first backup ring, and
wherein the cut portion provided in said second backup ring is cut in a direction which is orthogonal to a center axis of said second backup ring.

3 . The sealing device according to claim 1 , wherein an axial width y of said cut portion in said first backup ring is set to a magnitude which is 0.2 to 2.5 times an amount of eccentricity between said two members.

4 . The sealing device according to claim 3 , wherein the amount of eccentricity between said two members is equal to a diametrical gap c between said two members.

5 . The sealing device according to claim 2 , wherein an axial width y of said cut portion in said first backup ring is set to a magnitude which is 0.2 to 2.5 times an amount of eccentricity between said two members.

Assignees

• Nok Corp

Inventors

• Henmi Kota
• Hatano Makoto
• Yoshitsune Shuji

Classifications

• F02M55/004

  Joints; Sealings · CPC title

• F16J15/166 Primary

  with means to prevent the extrusion of the packing · CPC title

• F16J15/26

  with stuffing-boxes for rigid sealing rings · CPC title

• F16J15/3224

  capable of accommodating changes in distances or misalignment between the surfaces, e.g. able to compensate for defaults of eccentricity or angular deviations · CPC title

• F16J15/3216

  supported in a direction parallel to the surfaces · CPC title