Robert Boschgmbh

Alliedsignal Europe Services Techniques

Olivier Castello

Philippe Richard

Philippe Georges Castel

Jean Fourcade

Roland Levrai

Guy Meynier

Stéphane Lacroix

Cyril Divoux

In order to address a problem with the effectiveness of a brake booster device, provision is made for the latter to be produced in the form of hydraulic servo control. In such an instance, a master cylinder (-) of a braking circuit (-) is provided with a pressure chamber () upstream of the braking circuit. This pressure chamber is then subjected to an injection () of hydraulic fluid by a pump (). The pump is operated () according to the braking requirements. The servo control comprises a set of moving gear () sensitive to these requirements and that work an injection valve (-).

Hydraulic brake booster device

A method of detecting the braking of a vehicle comprising a push rod () intended to transmit an amplified braking command to a master cylinder. A plunger (), arranged parallel to the primary piston () so as to reproduce the movements of this piston, and a sensor () which senses the movements of the plunger (), this sensor () being fastened to the booster (), are used to detect a braking operation by detecting a movement of the plunger ().

Method and booster which are intended to detect the braking of a vehicle, and method of producing such a booster

A pneumatic booster operated by a plunger () housed in a bore () and bearing on a moving seat () which co-operates selectively with a shut-off member (). The shut-off member () is capable of selective co-operating with a stationary seat (). The plunger () being characterized by a cylindrical body () and a ring (). The ring () sliding between a front stop () and a rear stop () on the cylindrical body (). A front section of the ring () being located between the cylindrical body () and the bore () while a rear section () is designed to bear against the moving seat (). The ring () being temporarily retained in a stationary position in the bore () independent of any movement of the cylindrical body () through the action of a pivoting key () and an elastic snap ring () to allow permit and extended actuation of the booster after a sharp braking action has occurred.

Self-boosting pneumatic booster using a pivoting key

A method and structure for connecting a pneumatic booster (S) to a brake pedal (F) by nesting a second element () inside a second element () of a control rod (). The second element () is held one inside the first element () by a spring clip () that is housed in a circular groove () of an adapter () to define an elastic attachment and allow for play to be taken up to stabilize the connection.

Pneumatic brake booster provided with a control rod and method for mounting same

A fuse device for a pneumatic brake booster, characterized by a hollow cylindrical first part ( ) with a first end ( ) having an inside diameter (d ) and a bowl-shaped second part ( ) with a circular bottom equipped on its central external part with a roughly cylindrical stud ( ) of an outside diameter (d ) slightly greater, within the tolerances, than the inside diameter (d ) of the end of the hollow cylindrical first part ( ). The outside diameter (d ), allowing the hollow cylindrical first part ( ) to be secured to the bowl-shaped second part ( ) by forcibly inserting the stud ( ) into hollow end ( ) of smaller diameter (d ). The bowl-shaped second part ( ) having a circular external groove ( ) whose purpose is to weaken the connection between the stud ( ) and the bottom ( ) of the bowl-shaped second part ( ) when a pair of forces is applied to the fuse device to allow the hollow cylindrical first part to detach from the bowl-shaped second part.

Fuse device for pneumatic brake booster

Boosted brake device with concealed travel and guaranteed gain

A pressure-holding valve for a brake system having a body with a blind bore therein. The body has a first passage which connects the blind bore with a variable pressure inlet port and a pressure outlet port. The blind bore is closed by seals carried on a plug having an axial passage therein connecting said inlet port with a second passage connected to the first passage. A non-return valve is located in said blind bore between the plug and the bottom of the blind bore while a valve controlled by an electromagnet is locate in the plug. In response to an operational signal the valve controlled by the electromagnet is moved into engagement with a seat to interrupt communication between the inlet port and the first passage. If the pressure holding valve is on an incline plane, the non-return valve moves to close the axial passage to prevent the return of pressurised fluid from the outlet port toward the inlet port and thereby maintain the fluid pressure in the system at a value of the fluid pressure at the outlet port to sustain a brake application.

Growing community of inventors

Bondy, France

Olivier Castello