Patent ID: 9157543
Filing Date: 2015-10-13
Classification: B60T,F16K

Abstract:
1. A parking brake device, comprising: a bistable parking brake valve; a relay valve; a spring brake; and electrically actuable valves, wherein the electrically actuable valves selectively connect the parking brake valve to supply pressure or atmospheric pressure; wherein an outlet of the parking brake valve controls the relay valve, and the relay valve controls the spring brake, wherein the parking brake valve has a movable piston, which is loaded by a spring and has two coaxial piston faces which delimit a first space and a second space, wherein supply pressure, atmospheric pressure or a pressure which lies between them and which can be fed to the outlet of the parking brake valve is suppliable to the first space in accordance with the position of the piston, and wherein the second space can be selectively connected to supply pressure or atmospheric pressure by an electrically actuable valve.