SEALING STRUCTURE

WIPO Patent Application WO/2023/085164

A1

The present invention addresses the problem of providing a sealing structure having good sealing performance. This problem is solved by a sealing structure having a circular pillar-shaped shaft that has an annular groove, which is continuous in a circumferential direction, on an outer circumferential surface, a housing having a shaft hole into which the shaft is inserted, a seal ring which seals a gap between the shaft and the housing, and a backup ring disposed on the low-pressure side of the seal ring inside the annular groove, wherein: there is a tapered surface α on the low-pressure side of the groove bottom of the annular groove; a taper angle θα is 15° to 50°; the backup ring has a tapered surface β; a taper angle θβ is larger than the taper angle θα; and La, Lb, Lc, and Ld satisfy a specific relational expression where La is the length in a direction parallel to an axial line ωα of the backup ring, Lb is the length in a perpendicular direction, Lc is the length in a direction perpendicular to an axial line ωα of the tapered surface α, and Ld is the distance between the housing and the groove bottom of the annular groove.

WO/1999/045299	LOW LEAKAGE PLUNGER AND BARREL ASSEMBLY FOR HIGH PRESSURE FLUID SYSTEM
JPS60154666	[Title of the device] Mounting structure of an axial sealing member

ICHIKAWA HIROMASA (JP)
HAYASHI EIZO (JP)

PCT/JP2022/040774

May 19, 2023

October 31, 2022

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NOK CORP (JP)

F16J15/18

JP2011021723A	2011-02-03
JP2011007214A	2011-01-13
JPH11315925A	1999-11-16
JPH09222058A	1997-08-26
JPH1172162A	1999-03-16
JP2021184846A	2021-12-09

MIGITA, Shunsuke et al. (JP)

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