Patent ID: 8196718

Claim:
A combined service brake and stored-energy brake cylinder, comprising: a service brake cylinder; a stored-energy brake cylinder structurally connected to the service brake cylinder; a diaphragm, the diaphragm being arranged in the service brake cylinder and delimiting on a first side of the diaphragm a service brake chamber which can be loaded with a service brake pressure and delimiting on a second side of the diaphragm a chamber which accommodates restoring springs; and a stored-energy brake piston, the stored-energy brake piston being arranged in the stored-energy brake cylinder and delimiting on a first side of the stored-energy brake piston a stored-energy brake chamber and delimiting on a second side of the stored-energy brake piston a spring chamber which accommodates a storage spring, the stored-energy brake piston further including a piston rod which carries a venting valve which produces or shuts off a flow connection between the spring chamber and the service brake chamber, wherein the venting valve includes a piston which carries a valve body and at least one compression spring supported on the piston, and the venting valve piston is guided axially displaceably in a cylinder formed on the piston rod, the at least one compression spring supported on the venting valve piston biases the valve body against a first valve seat on the venting valve piston and against a second valve seat on the cylinder, the valve body is loaded by pressure in the spring chamber in a direction which lifts the valve body off of the first valve seat and off of the second valve seat, the venting valve piston is loaded by pressure in the service brake chamber in a direction which presses the first valve seat against the valve body and lifts the valve body off of the second valve seat, and a flow connection exists between the service brake chamber and the spring chamber when the valve body is lifted off of at least one of the first valve seat and the second valve seat.