SEALING DEVICE, AND PUMP DEVICE USING SAME

Title:

SEALING DEVICE, AND PUMP DEVICE USING SAME

Document Type and Number:

WIPO Patent Application WO/2011/093130

Kind Code:

A1

Abstract:

The objective is to provide a sealing device provided with an accumulated pressure relief function. In order to achieve the objective, a seal ring is combined with a back ring, and the back ring is comprised of a lip packing wherein one end of an annular base portion in the axial direction is provided with an inner peripheral lip and an outer peripheral lip, and the outer peripheral surface of the annular base portion is provided with an annular protrusion for setting a margin for the compression of the back ring in the radial direction. The outer peripheral lip is brought into close contact with a cylinder to seal fluid to be sealed, and is pushed by pressure accumulated in a space on the other end in the axial direction so that the outer peripheral lip is spaced from the cylinder to relieve the accumulated pressure. The annular protrusion is provided with a passage through which the accumulated pressure is introduced to the outer peripheral lip.

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Inventors:

TADANO HIKARU (JP)
MONMA HIROAKI (JP)
YOSHIOKA NOBUHIKO (JP)
YAMAGUCHI TAKAHIRO (JP)

Application Number:

PCT/JP2011/050387

Publication Date:

August 04, 2011

Filing Date:

January 13, 2011

Export Citation:

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Assignee:

NOK CORP (JP)
ADVICS CO LTD (JP)
TADANO HIKARU (JP)
MONMA HIROAKI (JP)
YOSHIOKA NOBUHIKO (JP)
YAMAGUCHI TAKAHIRO (JP)

International Classes:

B60T8/34; B60T17/00; F04B53/00; F04C15/00; F16J15/18; F16J15/3232; F16J15/3236; F16J15/3276

Foreign References:

JPH0218971U	1990-02-08
JPS564061U	1981-01-14
JPS611776U	1986-01-08
JP2000355274A	2000-12-26
JP3654043B2	2005-06-02
JP2007278086A	2007-10-25

Other References: