Patent ID: 6508521
Filing Date: 2003-01-21
Classification: B60T,F16K,Y10S

Abstract:
Anti-locking brake system, which is set up in particular for traction control and vehicle dynamics control havinga pump for actuating a wheel brake, which pump removes brake fluid from a brake pressure generating unit and supplies it to the wheel brake, and a valve arrangement which is disposed between the brake pressure generating unit and an input connection of the pump and takes the form of a two-connection/three-position valve, said valve arrangement including: a first valve element, which is biased into a normal position by a first spring arrangement, said first valve element being supported via the first spring arrangement against a housing; a first actuating device for bringing said first valve element into a first actuating position; a further valve element which is biased into a normal position thereof by a further spring arrangement, said further spring arrangement is supported via the first valve element wherein the further spring arrangement lies against a supporting part, said supporting part lying between the first valve element and the first spring arrangement; and a further actuating device for bringing the further valve element into a second actuating position; said valve arrangement, in a non-actuated normal position blocks the connection between the brake pressure generating unit and the input connection of the pump, and in a first actuating position establishes a secondary flow connection between the brake pressure generating unit and the input connection of the pump; and in a second actuating position establishes a primary flow connection between the brake pressure generating unit and the input connection of the pump, wherein the primary flow connection has a larger flow cross-section than the secondary flow connection and upon each actuation of the valve arrangement the arrangement initially moves into the first actuating position and then the second actuating position; and is then, through adjustment of the actuating force, selectively adjustable either into the first actuating position or into the second actuating position.