Pneumatic actuator for brake master cylinder, has piston with piezoelectric actuator increasing length of bush to vary position of front side of piston to apply braking force along skip distance greater than determined skip distance

摘要

The actuator has a piston (22) with a tubular bush (64) mounted around a plunger (56) forming front side of the piston. The piston has a piezoelectric actuator for increasing an initial length (L1) of the bush to a greater length. The length (L1) is increased to vary the position of the front side to push back a reaction disk such that a braking force is applied rapidly along a skip distance greater than a determined skip distance (d1). An independent claim is also included for a motor vehicle having a pneumatic actuator.