Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1985-10-17
1987-04-07
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 92, B60T 810
Patent
active
046555129
ABSTRACT:
A brake system having a master cylinder including main pistons, a brake booster for displacing the main pistons a brake valve for controlling the brake booster and a pressure supply device. The brake booster has a booster cylinder and a booster piston which is displaceable into the booster cylinder. The booster piston divides a booster chamber from an auxiliary chamber, which is located between the booster piston and the master cylinder. A first valve assembly and a second valve assembly are provided. The second valve assembly is located between the pressure supply device and the brake valve as well as a connection associated with the booster chamber. The first valve assembly is intended for relieving pressure in the booster chamber in favor of a return line or to join it with the pressure supply device. In the anti-skid mode, pressure in the booster chamber is initially reduced by means of the second valve assembly. This is effected by blocking the inflow of pressure medium to the brake valve and by relieving pressure in the booster chamber. If the drop in brake pressure attainable thereby should be inadequate, then by means of the first valve assembly, pressure medium is directed out of the pressure supply device into the auxiliary chamber. This pressure displaces the booster piston toward its initial position. As a result, a pressure drop down to zero is possible, no matter how severely a brake pedal coupled with the brake valve is depressed.
REFERENCES:
patent: 3922023 (1975-11-01), Harries
patent: 3927915 (1975-12-01), Adachi
patent: 4111496 (1978-09-01), Leiber
patent: 4462642 (1984-07-01), Leiber
patent: 4568130 (1986-02-01), Leiber
Graham Matthew C.
Greigg Edwin E.
Reger Duane A.
Robert & Bosch GmbH
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