Apparatus for the protection of a hydraulic brake system of a ro

Details Apparatus for the protection of a hydraulic brake system of a ro Apparatus for the protection of a hydraulic brake system of a ro

1987-12-02

1988-10-11

Reger, Duane A.

Fluid-pressure and analogous brake systems

Multiple systems

Fluid pressure and vacuum

60560, 60563, 188 724, 188356, 188264R, 303 31, F16D 6520, F16D 25062, B60T 1722

Patent

active

047766417

ABSTRACT:
To protect brake fluid against evaporation under extreme braking conditions, the brake fluid contained in the wheel brake cylinders is kept at a minimum pressure between 5 and 10 bar even after completion of a braking operation, thereby increasing the boiling point of the brake fluid. The wheel brake cylinders are designed as stepped cylinders with a counterpressure space, into which a likewise constantly kept counterpressure can be introduced, which maintains equilibrium with the admission pressure prevailing in the inlet pressure space of the respective wheel brake cylinder. A non-return valve arrangement, connected between the brake booster and the inlet pressure spaces of the wheel brake cylinders, blocks the return of the brake fluid to the brake booster when the pressure differential between the wheel brake cylinders and the brake booster drops below a threshold value P.sub.S. The counterpressure introduce into the counterpressure spaces of the wheel brake cylinders is likewise derived via a pressure limiting valve from a pressure accumulator element.

REFERENCES:
patent: 3382669 (1968-05-01), Bauer
patent: 3630027 (1971-12-01), Lambert
patent: 3713292 (1973-01-01), Huffman
patent: 3773148 (1973-11-01), Jean-Claude et al.

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