Pneumatic braking assistance servomotor for automotive vehicle, has arrangement which locks the plunger to the reaction disc to ensure maximal effect during emergency braking

摘要

The follower is fixed axially to the pin and has an indexing arrangement for axially indexing the locking position of the pin. The device comprises a pin (58) coaxially sliding in a plunger (46), and an annular key (60) surrounding the pin with play. When an input force is applied, at a speed determined to be an emergency braking, on the control rod (38) fixed to the plunger, the movable piston (22) is locked to the pin in an axial position, by the locking of the follower (52).