| 摘要 |
A combined service brake and spring brake cylinder has a diaphragm arranged in a housing of the service brake cylinder. At one side, the diaphragm delimits a service brake chamber acted on with a service brake pressure, and at the other side delimits a chamber accommodating a return spring. A spring brake piston is arranged in a housing of the spring brake cylinder, which at one side delimits a spring brake chamber and at the other side delimits a spring chamber. A piston rod supports a ventilation valve which produces or blocks a flow connection between the spring chamber and the service brake chamber. The ventilation valve includes a piston interacting with a valve seat. At least one further piston interacts with a further valve seat and opens at least one further flow cross-section when in its position raised from the further valve seat. When the parking brake is applied and the service brake is simultaneously actuated with service brake pressures lower than a pressure threshold, one piston is raised from the valve seat and the further piston is sealed against the further valve seat.
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