Robert Boschgmbh

Bosch Systemes De Freinage

Bosch Sistemas De Frenado S.l.

Other

Robert Bosch Technology Corporation

Robert Basach Gmbh

Fernando Sacristan

Juan Simon Bacardit

Ulysse Verbo

Jean-Pierre Gautier

Jean Pierre Gautier

Philippe Richard

Chris Anderson

Bruno Berthomieu

Joan Simon Bacardit

Esteve Cortes Guasch

Gerard Le Deit

Antony Auguste

Cedric Leboisne

Jean Fourcade

Jean-Marc Piel

Claude Hulliger

St&eacute;phane Lacroix

St&eacute;phane Gendrin

Pierre Pressaco

Jean-Paul Bentz

Jean Marc Attard

Leon Tomas

A pneumatic servomotor () for an assisted braking having a rigid axial casing () with a movable substantially truncated-cone shaped transverse skirt () that is integral with a piston () for the actuation of an associated master cylinder () that defines two pressure chambers () inside the casing. A substantially annular sealing diaphragm () made of an elastomeric material is interposed between the casing () and an outer peripheral area () of the skirt () has a substantially annular seal () made of an elastomeric material is interposed between an inner area of the skirt () and the piston (). The sealing diaphragm () and the seal () have a portion that is moulded over the skirt ().

Pneumatic servomotor comprising a diaphragm and/or a joint which is overmoulded onto the skirt

A pneumatic brake booster for a motor vehicle, comprising a piston () mounted between a control rod () actuated by a brake pedal and a push rod () actuating a piston of a brake master cylinder. Structure for increasing brake boosting during an emergency braking, comprising a cylindrical sleeve () mounted in an axially sliding and sealed manner inside the piston (). The sleeve being retained in the rest position by locking arrangement () and released to push away the shutter () of a three-way valve and increase the supply of atmospheric air to the booster when the control rod () is moved at a speed that is greater than a predetermined value.

Pneumatic brake booster

A boosted brake for actuating a primary piston () of a master cylinder through a feeler and a reaction disk having a decompression piston () that is elastically returned by a spring (). The decompression piston () has at least two radial branches () that are housed in the primary piston () of the master cylinder to provide two boost ratios that differ according to the intensity of an input force applied by an operator to effect a brake application.

Servo brake system comprising a decompression piston integrated with the primary piston of the master cylinder

A pneumatic servomotor for an assisted braking including an emergency-braking assistance device to increase the assistance ratio when an input force is applied to the control rod that is higher than a predetermined value through an extrusion of the reaction disk. The device (D) has a plastically-deformable first member () and second member () to accurately set a jump height of the servomotor and the activation force.

Pneumatic servo unit, method for making same and device

A boosted brake () having a booster () for activating a primary piston () of a master cylinder () by way of a feeler (), a reaction disk () and a push rod (). The push rod () that is housed a decompression piston () and returned elastically by a spring () to a position of rest has at least two radial branches () in order to provide two boost ratios which differ according to the intensity of the input force.

Servo brake system comprising a decompression piston integrated with the pushrod

A pneumatic brake booster () having a moving piston () for urging an actuating rod () of a master cylinder () in response to actuation of a plunger (). The plunger has a front end that passes through the piston () that forms a first feeler () that penetrates a reaction disc () located between the piston () and the actuating rod () to transmit to the plunger () a reaction force of the master cylinder () and a second feeler () that is pushed by the plunger () when the control rod () is actuated at a rate higher than a determined rate and immobilized by a one-way engagement device () in an axial position that varies with respect to the piston () and then is driven by the piston to push the second feeler () into the disc () so that the first feeler () applies a braking force more rapidly.

Servo brake booster with two differentiated fixed and variable jumps

A reaction device wherein a ratio of input force to output force for a brake booster is sequentially changed during a brake application. An actuation force derived from a pressure differential acts on a movable wall and is communicated through a cage as an output force to an push rod. The output force is a functional ratio of the input force as modified by a reaction disc and elastic means during a brake application. The reaction device functions as a rigid member until the input force reaches a first predetermined level Fd and a first boost ratio is in effect until a second predetermined force Fe is reached and a second boost ratio is in effect until a third predetermined input force level Ff is reached and a third boost ratio is in effect until a fourth predetermined fource level is reached.

Reaction device for brake booster

A servobrake () including a pneumatic brake booster () and a master cylinder () with a main piston () that slides in a front pressure chamber (). The main piston () has a fixed first rear end () acted on by a pneumatic piston () of the booster () and a moving second rear end () acted on by a feeler () of the booster () that is a coaxial with the piston () and acts upon a reaction ram () to communicate pressure forces in a front pressure chamber () of the master cylinder to the second end (). A hydraulic isolation valve shutter (), independent of the internal piston () of the ram (), is activated when the input force of the booster () exceeds a given rate threshold so that the braking force is not reduced.

Servobrake comprising a reduced-reaction master cylinder

A master cylinder () having an axial body () with a bore () for receving a piston (), a front seal () and a rear seal () to delimit a rear supply chamber () from a front pressure chamber (). A supply duct () in the body () that connects a reservoir to the rear supply chamber () has an opening between the front seal () and the rear seal (). The front seal () is mounted in a groove () of the body () and has an interior lip that contacts the piston () and lifts off the piston () as the piston () returns from a position of application to a position of rest to allow hydraulic fluid to be resupply the front pressure chamber ().

Master cylinder comprising a fluid and replenishing seal

A plunger arrangement ( ) for a braking servomotor that has an actuating piston to provide a force to activate a master cylinder. The plunger arrangement ( ) is located in a bore of a movable wall ( ) that separates the interior of the servomotor into a front chamber and rear chamber, The plunger arrangement ( ) is connected to a resiliently returned control rod ( ) and slides in bore as a function of an input force to define a braking application. The end of the plunger arrangement ( ) is slidingly fitted so as to bias a reaction disk of the actuating rod and transmit a reaction force to the control rod. The plunger arrangement ( ) includes a unidirectional clutch device ( ) comprising a key ( ) and a sleeve ( ) that are slidably mounted on a plunger ( ) such that when the control rod ( ) is actuated at a given speed the sleeve ( ) is locked in the bore of the movable wall ( ), independently of the control rod ( ), to maintain a braking application.

Servomotor with a deformation-adjustable sleeve and setup for the adjustment of such sleeve

The invention provides a pneumatic servomotor for an assisted braking of a motor vehicle, of the type comprising a unidirectional clutch device, which includes a coaxial sleeve ( ), sliding on a plunger ( ), and axial-locking means, which are capable of locking said sleeve ( ) in an end front axial position, in which it locks the piston ( ) independently of the control rod ( ), when an input force is applied at a given speed on the control rod ( ) integral with the plunger ( ), characterised in that the unidirectional clutch device comprises damping means, made of an elastomeric material and interposed between a stop-forming transverse intermediate face ( ) of the plunger ( ) and an opposite transverse face ( ) of the sleeve ( ), so as to permit, once the input force is released and when the locking means no longer lock the sleeve ( ), the noiseless return of the sleeve ( ) to its rear rest position.

Emergency braking brake booster comprising soundproofing means

Pneumatic booster with selective and controlled stress self-assistance

A pneumatic servobrake having a detector ( ) for the measurement of the pressure in a front chamber ( ). The detector ( ) has a baseplate ( ) that is situated opposite an opening ( ) in a wall ( ) of the front chamber ( ). A yoke-forming cage ( ) that is placed over the opening ( ) has an opening ( ) that is traversed by a pressure sampling tube ( ). The tube has a collar ( ) that is retained between the cage ( ) and the baseplate ( ). An adapter ( ) connected to the wall ( ) urges the tube ( ) against the cage ( ) to allow for both a sideways motion ( ) and a tilting motion ( ). The lower part ( ) of the tube ( ) is fitted with an O ring ( ) to establish a sealed pneumatic connection between the tube ( ) and baseplate ( ) such that a first sensor ( ) is isolated from a second sensor ( ) in a measurement of pressure in the first chamber ( ).

Pneumatic servobrake

Master cylinder with hydraulic reaction and selective self-powering

A master cylinder with hydraulic reaction. The master cylinder having a housing with a working chamber (,) therein in which slides a hollow main piston (,). The main piston (,) has a bore (,) for retaining a reaction piston (,) to define a reaction chamber (,). The reaction chamber (,) is connected to the working chamber (,) through a non-return valve (,) and a restriction (,). The non-return valve (,) and restriction (,) are mounted to independently move with respect to the main piston (,) to avoid a defect with a rise in pressure in the reaction chamber (,) when brake fluid retained in the working chamber has an excessively high viscosity.

Growing community of inventors

Barcelone, Spain

Fernando Sacristan