Sealing device
First Claim
1. A sealing device comprising:
- a main sealing body which is installed within an annular installing groove formed in a first member of two members concentrically arranged with each other and is slidably brought into close contact with a second member of the two members; and
a backup ring made of a harder material than said main sealing body which is arranged at a non-sealing space side of said main sealing body within said installing groove,wherein a height of said backup ring in a perpendicular direction from a bottom surface of said installing groove to the second member is greater than a perpendicular distance between the bottom surface of said installing groove and the second member, and said backup ring has a cross sectional shape which is symmetrical about a radial axis located midway in an axial thickness of said backup ring, and has an easily compressible outer diameter curved portion corresponding to a collapsing margin of said backup ring and which can be compressed to the extent of the difference between said height and said perpendicular distance.
1 Assignment
0 Petitions
Accused Products
Abstract
To prevent breakage of a sealing device having a main sealing body installed within an annular installing groove (31) formed in one member (3) to slidably and concentrically contact with the other member (2) and a backup ring (12) arranged at a non-sealing space side of said main sealing body, a height (h1±Δh1) of said backup ring (12) in a facing direction of a bottom surface (31a) of said installing groove (31) to the other member (2) is greater than a facing distance (L±ΔL) between the bottom surface (31a) and the other member (2), and said backup ring (12) has a cross-sectional shape which is symmetrical in a thickness direction thereof, and has an easily compressible part (12a) which can be compressed to the extent of the difference (x) between said height (h1±Δh1) and said facing distance (L±ΔL).
18 Citations
4 Claims
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1. A sealing device comprising:
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a main sealing body which is installed within an annular installing groove formed in a first member of two members concentrically arranged with each other and is slidably brought into close contact with a second member of the two members; and a backup ring made of a harder material than said main sealing body which is arranged at a non-sealing space side of said main sealing body within said installing groove, wherein a height of said backup ring in a perpendicular direction from a bottom surface of said installing groove to the second member is greater than a perpendicular distance between the bottom surface of said installing groove and the second member, and said backup ring has a cross sectional shape which is symmetrical about a radial axis located midway in an axial thickness of said backup ring, and has an easily compressible outer diameter curved portion corresponding to a collapsing margin of said backup ring and which can be compressed to the extent of the difference between said height and said perpendicular distance. - View Dependent Claims (2, 3, 4)
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Specification