APR PARKING PISTON DIRECT CONNECTION TO APR ROD

摘要

In a brake actuator having a plurality of actuator housing portions, a diaphragm seal that partially partitions the parking brake deactivation chamber is held between adjacent actuator housing portions, and an elastic element disposed between the diaphragm seal and one housing portion is parked. Suppresses expansion of the brake release chamber. Upon depressurization of the parking brake deactivation chamber, a push rod extending through the parking brake deactivation chamber generates brake actuation. The push rod extends into and out of the commercial brake actuation chamber, respectively, upon release of fluid pressure from the parking brake deactivation chamber and upon supply of fluid pressure to the parking brake deactivation chamber, and secures to both the push rod and the diaphragm seal. Pistons which can move together with them act as seats for the elastic elements. In order to force the center portion of the diaphragm seal together with both the push rod and the piston, a clamping mechanism is used to axially clamp the center portion of the diaphragm seal between the end of the push rod and the surface of the piston.