Patent ID: 7866765

Claim:
Pneumatic actuator for a braking system of a vehicle, comprising: a rear cylinder in which a rear piston is displaceably arranged, one side of the rear piston and an inner wall of the rear cylinder forming a rear ventilation chamber; a preloaded spring provided on the other side of the rear piston; a front cylinder in which a front piston having a rubber membrane is movably arranged, a rear side of the front piston forming part of a front ventilation chamber; an actuating rod for a brake element of the braking system provided on a front side of the front piston; a sliding rod by way of which the rear piston and the front piston are in mutual contact such that the front piston is displaceable by the rear piston; an intermediate flange provided in a region between the front cylinder and the rear cylinder, the intermediate flange being penetrated by the sliding rod; wherein, prior to assembly of the pneumatic actuator, the intermediate flange is separate from the front cylinder and the rear cylinder, at least one of the front cylinder and the rear cylinder is arranged to receive the intermediate flange against a supporting surface which limits an axial location of the intermediate flange to a predetermined depth, and wherein, when assembled, the intermediate flange is completely received in an interior of one of the rear cylinder and the front cylinder, the front cylinder and the rear cylinder are form-lockingly connected with one another with an outer membrane edge of the rubber membrane captured between the intermediate flange and an interior surface of at least one of the front cylinder and the rear cylinder at the connection of the front and rear cylinder, and only one housing connection between the rear cylinder and the front cylinder holds the intermediate flange and the membrane within the brake actuator while connecting the rear cylinder with the front cylinder.