Hydraulic brake pressure modulator

Details Hydraulic brake pressure modulator Hydraulic brake pressure modulator

1976-04-29

1976-12-28

Reger, Duane A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 63, B60T 826, B60T 806

Patent

active

039998100

ABSTRACT:
A hydraulic modulator which is positioned in a hydraulic brake pressure circuit forming a part of a brake system. The modulator uses power steering pump output fluid under normal conditions. When actuated, the relatively free flowing, low pressure fluid is restricted to build up pressure, causing the modulator to seal the modulating chamber from the supply pressure portion of the rear brake system and then open the rear brake apply conduit to a displacement-increasing modulating chamber. The rate of displacement increase is controlled by a release restriction through which trapped pressurized fluid from the power steering pump is controllably released to the pump reservoir. Upon deactivation of the modulator, the displacement is decreased and rear brake pressure is reapplied. When no pressure is available from the power steering pump, the modulator piston and displacement valve are so positioned as to seal the modulating chamber from the remainder of the brake system and connect the master cylinder port to the rear brake port.

REFERENCES:
patent: 3810680 (1974-05-01), Schenk
patent: 3871717 (1975-03-01), Jensen

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