Robert Boschgmbh

Christian Caquet

Ignacio Diaz Bueno

Jean-Pierre Michon

Christian Ast

Maurice Gebauer

The invention relates to a tandem pneumatic brake booster () for a vehicle. The objective is to prevent a blocking of a booster thrust rod () in the maximum travel position. The blocking appears following a sealed adhesion of a first plate skirt () on a seal () of the tandem booster. This seal blocks a vacuum in a first front chamber (). To prevent this blocking, provision is made to crenelate a first lip () pressed against the pneumatic piston () of a seal. Merlons prevent a sealed adhesion of the plate skirt () over the whole seal (). This absence of adhesion creates a leakage of air to the first front chamber () and allows a return to a rest position.

Tandem pneumatic brake booster

A brake system having a master cylinder () actuated by a moving piston () that is fixed to a moving partition () in a booster (). Piston () has a front face () that acts on a primary piston () of the master cylinder () by way of a reaction disk () located between a rear end of the primary piston (). The front face () has a feeler () that is fixed to a control rod () of the booster () and comes into contact with the reaction disk () to transmit a reaction force from the master cylinder () to the control rod (). The front end () of the feeler () includes at least one stud () which projects parallel to the axial direction and engages the reaction disk () to provide for proportionality between the force that is transmitted between the control rod () and the force exerted on the primary piston ().

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Courtry, France

Christian Caquet