Robert Boschgmbh

Maurice Gerbauer

Jean Pierre Gautier

Miguel Perez

A pneumatic servomotor ( ) for an assisted braking having a housing, separated by a diaphragm ( ) into a first variable-volume chamber ( ) and a second variable volume chamber ( ) therein. During a. brake application a force applied to a control rod ( ) moves to allow a first flap ( ) to isolate the second chamber ( ) from the first chamber ( ) and thereafter allow a second flap ( ) to open and allow pressurized assist fluid to be communicated to the second chamber ( ). The diaphragm ( ) has a lip ( ) thereon that engages the housing to define a thrust chamber ( ). On opening of the second flap ( ) allows the pressurized assist fluid is initially communicated to the thrust chamber ( ) and only after a predetermined travel of the control rod ( ) is the pressurized assist fluid communicated to the second chamber ( ) for creating a pressure differential between the fluid in the first chamber ( ) and second chamber ( ) to develop an output force to effect a brake application. On termination of the input force to the control rod ( ) the lip ( ) provides for one-way isolation to permit the discharge of the assistance fluid from second chamber ( ) to allow for equalization of fluid pressure in the first ( ) and second ( ) chambers.

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Sevran, France

Maurice Gerbauer