Patent ID: 11958450
Assignee: ZF CV SYSTEMS EUROPE BV
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 2:
3. The compressed-air braking system (DBA*) for a motor vehicle, the compressed-air braking system comprising:
a compressed-air supply device (1) with a compressor (2) and
several brake circuits which are connected to the compressed-air supply device (1) via a multi-circuit protection valve (7), and include at least one parking brake circuit with parking brake cyliners (25.1, 25.2),
wherein the parking brake cylinders (25.1, 25.2) are configured to be vented, per wheel or per vehicle axle, alternately either to the surrounding atmosphere or into a reservoir (31) via a respective quick-venting valve (29) connected to a connecting line (28) and a changeover vale (30) arranged downstream thereof in the at least one parking brake circuit, and
wherein the changeover valve (30) is configured as a pressure-controlled 3/2-way directional valve with a control pressure input (39), an input port (40) and two output ports (41, 42), the 3/2-way directional valve having an unactuated rest state, in which the input port (40) is connected to the first output port (41), and a switched state, in which the input port (40) is connected to the second output port (42), wherein the control pressure input (39) is connected to the input port (40), the first output port (41) leads to the surrounding atmosphere, and the second output port (42) is connected to the reservoir (31).