US 12,330,604 B2
Operationally reliable parking brake valve assembly having multiway switching in series
Julian van Thiel, Grossburgwedel (DE)
Assigned to ZF CV Systems Global GmbH, Bern (CH)
Filed by ZF CV Systems Global GmbH, Bern (CH)
Filed on Jul. 19, 2024, as Appl. No. 18/778,553.
Application 18/778,553 is a continuation of application No. PCT/EP2023/050268, filed on Jan. 9, 2023.
Claims priority of application No. 10 2022 101 142.9 (DE), filed on Jan. 19, 2022.
Prior Publication US 2024/0375628 A1, Nov. 14, 2024
Int. Cl. B60T 13/68 (2006.01); B60T 13/38 (2006.01)
CPC B60T 13/683 (2013.01) [B60T 13/385 (2013.01); B60T 2270/402 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A parking brake valve assembly for a pneumatic braking system of a utility vehicle, the parking brake valve assembly comprising:
a first parking brake valve unit;
a second parking brake valve unit;
said first parking brake valve unit defining a plurality of switching positions including a first switching position (2A) to a second switching position (2B);
said first parking brake valve unit being configured to be actuated by a first parking brake signal and to be switched from said first switching position (2A) to said second switching position (2B);
said second parking brake valve unit defining a plurality of switching positions including a first switching position (4A) to a second switching position (4B);
said second parking brake valve unit being configured to be actuated by a second parking brake signal and to be switched from said first switching position (4A) to said second switching position (4B);
the first parking brake signal and the second parking brake signal being independent of each other; and,
said first parking brake valve unit and said second parking brake valve unit being pneumatically connected in series between a parking brake supply connection and a parking brake working connection such that said parking brake working connection is configured to be both ventilated and vented independently of the switching position of one of said first parking brake valve unit and said second parking brake valve unit by switching another of said first parking brake valve unit and said second parking brake valve unit.