Robert Boschgmbh

Carole Charpentier

Laurent Lhuillier

Antony Auguste

Olivier Bernadat

Marc Rodriguez

Daniel Grech

Chris Anderson

Bastien Cagnac

Raynald Sprocq

Jean-Pierre Michon

François Gaffe

Marc Noblet

Julien Gateau

Nicolas Quiniou

Eligiusz Stefaniak

Sebastien Dusch

David Bazaud

Brake fluid reservoir valve for installation in the reservoir's outlet tube. It includes an outer sleeve fixed in the reservoir tube and equipped with an outer stop and a hollow piston housed in the sleeve. The top of the piston is closed and bordered by a groove accommodating an o-ring seal that rests upon the upper edge of the sleeve whenever the piston enters the sleeve. The piston has windows beneath the groove communicating with the interior of the piston and lugs near its lower extremity. Openings are provided in the extension of the piston beneath the lugs. A compression spring is inserted between the piston and the outer sleeve, between the stop and the lugs.

Brake fluid reservoir valve for a master cylinder

An electrohydraulic servo brake includes a master brake cylinder, which is controlled by a push rod. The push rod is configured to be actuated by a first auxiliary piston via a reaction disk. A plunger piston presses on the reaction disk. An end of the push rod is connected to the first auxiliary piston by a connection apparatus. The connection apparatus includes a rest for a rated compression spring, which rest is rigidly connected to the push rod, and a central piston, which rests against the reaction disk along an axis and is surrounded by a second auxiliary piston, which is placed against the reaction disk and is moved by the spring and is held in an end position by the central piston. The second auxiliary piston is configured to recede in relation to the central piston rigidly connected to the push rod.

Electrohydraulic servo brake

A primary piston composed of a skirt and an intermediate back wall having a rear face receiving the servobrake thrust rod and a forward face for the telescoping rod and the spring pushing the secondary piston. The front of the skirt has longitudinal grooves open in front and closed in the rear. The thickness of the skirt beneath the grooves and the part of the skirt between two successive grooves in the peripheral direction form a front face enabling the principal piston to push the secondary piston. The principal piston is made of a single piece of plastic material.

Primary piston for a tandem master cylinder and tandem master cylinder equipped with such a primary piston

A master cylinder having a primary piston and a secondary piston is described. The secondary piston is realized of plastic material; it is composed of a skirt and an end wall. The forward edge of the skirt is equipped with longitudinal slots intended to cooperate with the resupply seal to resupply the secondary pressure chamber and ensure operation in rest position whenever the brake circuit is in ESP mode. Supply occurs from the supply chamber, which is connected to the brake fluid reservoir.

Tandem master cylinder secondary piston and master cylinder equipped with such a secondary piston

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.

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

The invention relates to a braking control system for automotive vehicles comprising a braking control member (), a brake booster () and a brake master cylinder (). The system of the invention further comprises a simulator () coupled pneumatically to the piston () of the brake booster (). Said simulator () receives at least one braking command from the braking control member () and makes it possible to establish, in return, a difference in pressure between the front chamber () and the rear chamber () of the brake booster so as to control the displacement of the piston (). Application: Brakes for automotive vehicles.

Control system for hydraulic braking system

The invention relates to a master cylinder () with reduced free travel (). Current master cylinders have a free travel during the displacement of a piston () in a bore () of a master cylinder body (). Such a free travel may be reduced with the aid of a frustoconical portion () in the piston, an orifice () for communication of hydraulic fluid being situated on said inclined wall, a gap () between the inclined wall and an inner wall () of the bore allowing a passage for hydraulic fluid capable of filling a pressure chamber (). However, such inclined walls create a change in the slope of an outer wall () of the piston, this change being able to cause a separation of an inner lip () of a sealing cup (). To prevent this separation, the invention provides that the inclined wall forms a convex rounded surface ().

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Montmorency, France

Carole Charpentier