Brake cylinder and motor vehicle brake comprising such a cylinder

摘要

A mechanically and hydraulically actuated brake cylinder for a motor vehicle having a body with a chamber for receiving an axially movable piston ( 4 ) that is connected to a pivoting shaft ( 11 ) that has a part that is located outside of the body. Pressurized fluid is presented to the chamber to hydraulically actuate a brake application while a rotational torque is applied to the shaft ( 11 ) to mechanical actuate a brake application through a ball-ramp mechanism that converts the rotational torque into translational movement for the piston. The ball-ramp mechanism is defined by a rotary plate ( 28 ) fixed to the shaft ( 11 ) with a first ramp ribs ( 31 ), second ramp ribs ( 32 ) on the piston ( 4 ) and balls ( 33 ) housed in the ramp ribs.