Method for detecting an error in the installation of a seal in a master cylinder

Patent metadata

Field	Value
Publication number	US-9409263-B2
Application number	US-201113994511-A
Country	US
Kind code	B2
Filing date	Nov 16, 2011
Priority date	Dec 17, 2010
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A method is described for detecting an incorrectly installed seal in a master-cylinder having a seal. The master cylinder is subjected to a pressure comprised between approximately 0.3 and 0.6 MPa at the conclusion of master-cylinder assembly and, if there is a drop in the pressure, the seal is considered to have been installed in reverse in the groove of the master cylinder.

First claim

The invention claimed is:

1. A method for detecting an incorrect installation of a master cylinder seal in a motor vehicle brake system, the master cylinder including a body equipped with a bore hole accommodating at least one piston actuated by a driver between a rest position and a braking position and elastically returned to its rest position, wherein: the bore hole is provided with at least one supply chamber connected to a brake fluid reservoir, the piston separates the supply chamber from a pressure chamber connected to a brake circuit, the supply chamber is bordered by two grooves that respectively receive a resupply seal separates the supply chamber from the pressure chamber, and a seal separates the supply chamber from an exterior with respect to a surface of the piston, the seal is a U-shaped peripheral seal, lying flat, a branch of which is applied to a back of a first one of the two grooves, and two adjacent walls to another branch ensures the seal with the piston, the method comprising:
after assembly of the master cylinder, subjecting the seal in the master cylinder to a test pressure; and
determining that the seal is installed in reverse in the master cylinder responsive to a pressure drop under the influence of the test pressure.

2. The method according to claim 1 , further comprising:
testing an installation of seals in the master cylinder by compressed air acting as a fluid.

3. The method according to claim 1 , wherein the master cylinder and the seals are subjected to a pressure on the order of 0.3-0.6, MPa.

Assignees

• Auguste Antony
• Lhuillier Laurent
• Quiniou Nicolas
• Grech Daniel
• Charpentier Carole
• Bosch Gmbh Robert

Inventors

• Auguste Antony
• Lhuillier Laurent
• Quiniou Nicolas
• Grech Daniel
• Charpentier Carole

Classifications

• B23P15/10 Primary

  pistons · CPC title

• Y10T29/49764

  with testing or indicating · CPC title

• Y10T29/49236

  Fluid pump or compressor making · CPC title

• Y10T29/49776

  Pressure, force, or weight determining · CPC title

• B60T11/236

  Piston sealing arrangements · CPC title