Robert Boschgmbh

Bosch Systemes De Freinage

C&eacute;dric Leboisne

Ulysse Verbo

Daniel Grech

Jean Fourcade

Jean-Marc Piel

Gendrin St&eacute;phane

Carr&eacute; Jacques

A servobrake having a rigid jacket defined by a first shell joined to a second shell by through tie-bars to create variable volume front and rear chambers. The front chamber is permanently connected to a first pressure source whereas the rear chamber is selectively connected to the first pressure source and a second pressure source. The servobrake including a pressure sensor for the measurement of the pressure inside of the front and rear chambers. The pressure sensor is characterized by being attached to a front end of the through-tie bar whereas the tie-bar is characterized by a hollowed-out body with a hollow inner needle sealingly retained therein. The hollow inner needle defines a first chamber while a second chamber is defined by a space between the inner hollow needle and the hollowed-out body. The hollowed-out body has first ports therein for connecting the rear chamber with the first chamber through which pressure present in the rear chamber is transmitted to the pressure sensor. The hollowed-out body has second ports therein for connecting the front chamber with the second chamber through which pressure present in the front chamber is transmitted to the pressure chamber.

Brake booster

A boosted braking device for a motor vehicle having a master cylinder (M) and a pneumatic booster (S). The booster (S) has a rigid casting ( ) divided by a mobile partition ( ) into at least a front chamber ( ) and a rear chamber ( ). A three-way valve ( ) carried by the mobile partition ( ) is actuated by a control rod ( ) to control the pressure in the rear chamber ( ) for operating the master cylinder (M). The casing ( ) includes a front shell ( ) and a rear shell ( ) each of which comprises a radial shoulder ( ) and being secured together by hooping ( ) interconnecting with the shoulders ( ) of the front shell ( ) and rear shell ( ). The hooping ( ) comprises first ( A) and second ( B) part hoops. The first ( A) and second ( B) part hoops are joined together by at least one locking element ( ) which is rendered non-functional when the master cylinder (M) is subjected to substantial stress as a result of a frontal or oblique impact of the vehicle.

Boosted braking device with passive safety

A hydraulic-reaction master cylinder (,) having a working chamber (,) in which slides a hollow main piston (,) with a bore (,) therein which retains a reaction piston (,) to define a reaction chamber (,). The reaction chamber (,) has an annular shape and communicates with the working chamber (,) through at least one non-return valve (,) or an axial passage (,). The axial passage (,) is closed off selectively an axial stub (,) that extends from the reaction piston (,).

Master cylinder with dynamically adjustable hydraulic reaction

A braking device having a flange (,) of master cylinder (,) secured to a pneumatic booster (,) by a nut (,) screwed onto a through-bolt (,) that extends through a front shell (,) and a rear shell (,). The through-bolt (,) has a threaded front end (,) and a shoulder (,) for holding a front wall (,) in alignment with the master cylinder (,). The nut (,) has a barrel engaged in a hole (,) in the flange (,) and is screwed onto the front end (,). A collar (,) on the nut (,) acts on the flange (,) to press the flange (,) against the front shell (,). The barrel (,) of the nut and shoulder (,) of the through-bolt (,) have first and second respective sections (S,, S,) which face each which engage the front shell (,) with the first section (S,) being larger than the second section (S,) such that the front shell (,) crumples on receipt of a impact force.

Growing community of inventors

Paris, France

Cédric Leboisne

Growing community of inventors

Paris, France

C&eacute;dric Leboisne

Cédric Leboisne