Setting procedure for the threshold value of a pneumatic brake booster and servomotor for carrying out this method.

摘要

The invention relates to a method for adjusting the value of the jump of a brake booster, booster in which are movably mounted a hollow booster piston (20), a control rod (30) with a plunger (28) housed in the piston (20), the rear end of the plunger (28) forming a first annular valve seat (28a) concentric with a second annular valve seat (20a) carried by the piston (20) of assistance, the first (28a) and second (20a) valve seats cooperating with an annular valve member (34) carried by the assistance piston (20), a reaction disk (48) being interposed between an annular front face (20b) of the assistance piston (20) and a rear face of a push rod (46). br / according to the invention, the method comprises the following steps: & br / - apply to the push rod (46), a force equal to the boost force corresponding to the desired booster jump, & br / - move the seat (20a) of the assistance piston (20) of the valve (34), & br / - put into contact with the front face of the feeler (28) and the rear face of the reaction disk (48) and maintaining this contact for the next step, & br / - put into contact with the seat (20a) of the assistance piston (20) with the valve (34) in order to avoid that - treatment of the seat of the feeler 28a and & br / - releasing the force applied to the push rod (46).