CUP SEAL AND MASTER CYLINDER USING THE SAME

Title:

CUP SEAL AND MASTER CYLINDER USING THE SAME

Document Type and Number:

WIPO Patent Application WO/2008/054010

Kind Code:

A1

Abstract:

In a cup seal, the hydraulic pressure inside a first hydraulic pressure chamber (6) causes a first seal section (21e) of an outer lip (21c) to be in intimate contact with a bottom wall (20a) of a recess (20) and a second seal section (21f) of a base (21a) to be in intimate contact with a rear surface (20b) of the recess (20). Double sealing by the first and second seal sections (21e, 21f) reliably prevents leakage of brake fluid in the first hydraulic chamber (6). When the pressure in the first hydraulic chamber (6) is negative, the forward end of the outer lip (21c) bends inward and the outer peripheral edge side of the base (21a) bends forward. This causes the brake liquid in a reservoir to flow into the first hydraulic chamber (6) after passing through a gap between the wall surface of the recess (20) and the first and second seal sections (21f, 21e), which secures replenishment of the brake liquid.

More Like This:

WO/2003/093084	MASTER CYLINDER UNIT FOR VEHICLES
JP2552079	[Name of device] Master cylinder
JPS60156071	[Title of the device] Master cylinder

Inventors:

AOKI TOMOHIRO (JP)
SHIWA MASAKI (JP)

Application Number:

PCT/JP2007/071452

Publication Date:

May 08, 2008

Filing Date:

October 30, 2007

Export Citation:

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Assignee:

BOSCH CORP (JP)
AOKI TOMOHIRO (JP)
SHIWA MASAKI (JP)

International Classes:

B60T11/16; B60T11/236; F16J15/18; F16J15/3232; F16J15/3236

Domestic Patent References:

WO2005019007A1

2005-03-03

Foreign References:

JP2005534877A	2005-11-17
JP2004231093A	2004-08-19
JPH10297463A	1998-11-10
JPS59151762U	1984-10-11
JPS61148748U	1986-09-13
JPS6353862U	1988-04-11
JP2003261020A	2003-09-16

Other References: