公开(公告)号：US20220410863A1

公开(公告)日：2022-12-29

申请号：US17777797

申请日：2020-12-08

申请人： Knorr-Bremse Systeme Fuer Nutzfahrzeuge GmbH

发明人： Zsigmond CSOMA ,  David JAKAB ,  Oliver UDVARDY ,  Ravi Katta SHANKAR ,  Balazs Viktor BIRKAS

IPC分类号： B60T15/02 ,  B60T15/04 ,  B60T15/12 ,  B60T15/22 ,  B60T15/44 ,  B60T17/04

摘要： A valve-arrangement is operable to switch between a bistable-valve (BV) behavior and a relay-valve (RV) behavior to control a parking-brake, and includes a housing with a supply-pressure-inlet (SPI), a service brake-control-inlet (SBCI) to provide a control-pressure, a pressure-outlet, and an exhaust-port, and includes a first-piston and a second-piston both movable along a same direction in the housing to define a first-chamber communicating with the SBCI, a second-chamber between the first-piston and the second-piston, and third chamber communicating with the pressure-outlet and with a controllable connection to the SPI, in which upon the control-pressure the second-piston moves with the first-piston to connect the pressure-outlet with the exhaust-port or with the SPI. The valve arrangement includes a throttle unit adapted, depending on the control-pressure, to connect the second-chamber with the third-chamber to enable the BV behavior or disconnect the second-chamber from the third-chamber to enable the RV behavior.