Patent ID: 6332623
Filing Date: 2001-12-25
Classification: B60G

Abstract:
A level of adjustment device for vehicles with a plurality of air springs, comprising:a source of compressed air;an air dryer connected to the compressed air source;a check valve connecting said air dryer to said air springs;a pneumatically controlled first distribution valve having a pneumatic control input,said first distribution valve connected to said air dryer, said compressed air source, the atmosphere, a second controllable distribution valve, and a pneumatically controlled third distribution valve,said pneumatic control input of said first distribution valve connecting said pneumatically controlled first distribution valve to said second controllable distribution valve and to a pneumatically controlled input of said pneumatically controlled third distribution valve,said second controllable distribution valve connecting said air springs to said pneumatic control input of said pneumatically controlled first distribution valve and to said pneumatic control input of said pneumatically controlled third distribution valve,whereas during air spring filling, said check valve is open connecting the compressed air source to said air springs; andwhereas during air spring emptying, each air spring is connected to the atmosphere through said air dryer, through said pneumatically controlled first distribution valve, and through said pneumatically controlled third distribution valve,wherein the pneumatic control input of said first distribution valve is impinged through said second controllable distribution valve with pressure from the air springs against a restoring force acting on the pneumatic control input, andwherein the pneumatically controlled input of the a pneumatically controlled third distribution valve is impinged with the pressure of the air springs against a restoring force acting on the pneumatic control input of the pneumatically controlled third distribution valve, andto end the air spring emptying process, the pneumatic control input of said pneumatically controlled first distribution valve is connected to the atmosphere through said second controlled distribution valve.