Lucas Automotive Gmbh

Lucas Industries Public Limited Company

Gerd Puscher

Peter Schl&uuml;ter

Heinrich Plewnia

Ludwig Friedsam

Albert Zinndorf

Thomas Hannus

A pneumatic brake booster ( ), in particular for motor vehicles, is described. The pneumatic brake booster ( ) has a control valve ( ) for controlling a pneumatic pressure difference, a force input element ( ) for actuating the control valve ( ), a force output element ( ) for transmitting the braking force as well as a reaction disk ( ) of elastomer material disposed between the force output element ( ) and the force input element ( ). Disposed between the reaction disk ( ) and the force input element ( ) and acting upon the reaction disk ( ) is a unit ( ) for altering the force transmission ratio between the force input element ( ) and the force output element ( ) in dependence upon the force exerted upon the force input element ( ). The unit ( ) comprises a displaceable inner piston ( ) as well as an outer piston ( ), which surrounds the radially outer side of the inner piston ( ) and is displaceable relative to the inner piston ( ). The inner piston ( ) has at the radially outer side or the outer piston ( ) at the radially inner side a depression ( ) for receiving material particles, which depression ( ) is covered by the in each case other piston ( ).

Pneumatic brake booster with variable force transmission ratio

A vacuum brake booster ( ) is described, having a vacuum chamber ( ) and a working chamber ( ) separated from one another by a movable wall ( ), and a control valve ( ), which comprises a housing ( ) coupled workingly to the movable wall ( ) and which to achieve a pressure difference at the movable wall ( ) is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber ( ) in dependence upon the displacement of an actuating piston ( ). The vacuum brake booster ( ) has an emergency braking aid comprising a permanent magnet ( ) and an armature ( ), which cooperates with the permanent magnet ( ) and is resiliently biased counter to actuating direction and during an emergency braking operation is drawn into abutment with the permanent magnet ( ), with the result that the control valve ( ) is held open for the supply of atmospheric pressure to the working chamber ( ). The vacuum brake booster ( ) comprises a coupling device ( ) for detachably coupling the armature ( ) to the actuating piston ( ).

Vacuum brake booster with mechanical emergency braking aid

A pneumatic brake booster ( ) comprises a control valve ( ) for controlling a pneumatic pressure difference, a force input element ( ) for actuating the control valve ( ), a force output element ( ) for transmitting the braking force, a reaction disk ( ) made of elastomeric material disposed between the force output element ( ) and the force input element ( ), and a device, which is disposed between the reaction disk ( ) and the force input element ( ) and acts upon the reaction disk ( ), for varying the force transmission ratio between force input element ( ) and force output element ( ) in dependence upon the force exerted on the force input element ( ). For a less expensive design and greater ease of assembly, the device for varying the force transmission ratio is designed as a preassembly unit in the form of a cartridge ( ), which after preassembly is insertable into the control valve ( ). The cartridge ( ) comprises a plunger ( ), of which the end facing the reaction disk ( ) is connected to a piston ( ), a hollow-cylindrical operating piston ( ), which surrounds the piston ( ) and is displaceable relative to the latter, a stop ( ), which is provided on the plunger ( ) and defines an initial position, in which the areas of operating piston ( ) and piston ( ) facing the reaction disk ( ) form a common, flush area, and a spring ( ), which is supported against the plunger ( ) and which biases the operating piston ( ) towards the stop ( ).

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Andernach, Germany

Gerd Puscher