| 摘要 |
The parking brake device implements a bistable parking brake valve (1) by means of a displaceable piston which is loaded by a spring (7) and has two coaxial piston faces (3, 4) which bound two spaces (5, 6). Supply pressure, atmospheric pressure or a pressure which lies between them and which can be fed to the outlet (A3) of the parking brake valve (1) can be applied to the first space (5) as a function of the position of the piston (2). The second space (6) can be optionally connected to supply pressure or atmospheric pressure by means of a valve (30). The piston faces (3, 4) are selected such that the piston (2) is moved counter to the force of the spring (7) when the sum of the pressures in the two spaces (5, 6) exceeds a predetermined value. |
