Robert Boschgmbh

Bosch Systemes De Freinage

Jean-Marc Attard

Ulysse Verbo

Chris Anderson

Raynald Sprocq

Antony Auguste

Cedric Leboisne

Jean-Pierre Michon

The invention relates to a brake booster with a short actuating travel, in which booster the three-way valve has a moving valve seat borne by a sleeve (). The movement of this sleeve is controlled by the piston. The invention provides a device that comprises a face () that is inclined with respect to the axis of the sleeve in order to allow the sleeve () to move gradually.

Quick booster

The invention relates to a brake booster with a short operating travel, in which the three-way valve comprises a mobile valve seat borne by a sleeve (). The movement of this sleeve is controlled by the piston. According to the invention, there is an elastic device () applying force to the sleeve () in the direction of the front of the booster, and tending to move this sleeve forward with respect to the pneumatic piston (). In addition, there is a device for transmitting the pressure of the master cylinder () to the sleeve () and that tends to apply a rearward force to the sleeve ().

Motor vehicle rapid braking brake booster

A pneumatic brake booster with short actuating travel, comprising a skirt and a pneumatic piston that are rigidly connected and slideably mounted in a sealed casing to delimit a low-pressure chamber and a variable-pressure chamber and a three-way valve arrangement that is controlled by a control rod connected at a first end to a brake pedal. The three-way valve arrangement having first and second valve seats and a valve that is applied to at least one of the first and second valve seats by a valve spring. The second valve seat being borne by a first longitudinal end of a plunger distributor while the first valve seat is borne by a first longitudinal end of a bushing slideably mounted in a sealed manner in the pneumatic piston over a defined first travel and beyond the defined travel the bushing is secured axially to the pneumatic piston.

Booster with reduced dead travel and a braking system comprising such a booster

A pedal box for a motor vehicle, comprising clutch (), brake (), and accelerator () pedals that are mounted to respectively rotate about a corresponding pivots (X, X, X) between a rest position and a position of maximum actuation after passing through a multitude of intermediate positions. A link () located between the accelerator pedal () and the brake pedal () places the brake pedal () in an intermediate position or a rest position depending on whether or not the accelerator pedal () is in a rest position.

Pedal support with coupled functions

A braking device for a motor vehicle, including a master cylinder () with a primary piston () subjected to an actuating force of an input force exerted by a manual operating member () and a boost force exerted by a booster () coupled to the manual operating member () and an emergency assist valve (VA). Valve (VA) comprises: a reaction piston () sliding in a bore () of the primary piston () and urged toward a position of rest by by an elastic return member (); a rapid piston () having a cross section smaller than the reaction piston () and sliding in a sealed manner in a bore () of a bushing () in bore (; and a ratio control () actuated by a plunger distributor () driven by the manual operating member (). The elastic return member () is arranged outside of the primary piston () and a transmission element (T) is provided to transmit a return force of the elastic return member () to the reaction piston ().

Brake booster with high kick-off emergency valve

A braking device, for a motor vehicle, comprising: a master cylinder ( ), a primary piston ( ) mounted to slide in the master cylinder, a manual-control member ( ), a booster coupled to the manual-control member, an emergency assist valve (VA) comprising a reaction piston ( ) and a rapid piston ( ), and a ratio control (T) actuated by a plunger distributor ( ) driven by the manual-control member ( ). The reaction piston ( ) and the rapid piston ( ) form one and the same stepped piston ( ) having a part ( ) of large cross section and a part ( ) of small cross section, the large-section part ( ) determining, with a first bore ( ) of the primary piston ( ), a variable-volume annular chamber ( ). A separation/communication assembly ( ), controlled by the displacement of the stepped piston ( ), is designed so that the pressure of the liquid is exerted effectively on the large cross section ( ) of the stepped piston when the stepped piston occupies a position of rest or is to the rear of the position of rest, and on only the small cross section ( ) when the stepped piston is displaced forward relative to the main piston under emergency braking.

Boosted braking device with emergency valve

A master cylinder having a body ( ) with a bore ( ) therein in which slides at least a primary piston ( ). The primary piston ( ) has a compensation passage ( ), which in a position of rest, places a pressure chamber ( ) in communication with a reservoir ( ). The communication between interrupted upon actuation of the master cylinder by a control rod ( ) acting on a second piston ( ) sliding in the bore ( ). A first compression spring ( ) and a second compression spring ( ) urge the primary piston ( ) and second spring ( ) toward a rear position of rest. The preload force of the first compression spring ( ) exceeding that of the second compression spring ( ) such that the second piston ( ) is the first to move in response to a force applied to the control rod ( ). The rear position of rest for the primary piston ( and second piston ( ) is defined by a same stop ( ) which is integral with the body ( ) of the master cylinder.

Growing community of inventors

Villers Sous St Leu, France

Jean-Marc Attard