Motors: expansible chamber type – With motive fluid valve – Continuous motive fluid flow through chamber in motor idle...
Patent
1995-12-07
1997-08-12
Lopez, F. Daniel
Motors: expansible chamber type
With motive fluid valve
Continuous motive fluid flow through chamber in motor idle...
91434, F15B 1110
Patent
active
056554290
ABSTRACT:
A brake system with a hydraulic pilot brake valve for use in connection with a vehicle requiring finite brake control with high volume pressure control. The brake system includes the hydraulic pilot brake valve, a main hydraulic system, a control hydraulic system, and hydraulic brakes. The main hydraulic system includes a belt-driven hydraulic pump, a tank of hydraulic fluid, and an accumulator. The control hydraulic system includes an electrically actuated hydraulic pump and a tank of hydraulic fluid. The pilot brake valve is designed to control the flow of hydraulic fluid from the main hydraulic system to the hydraulic brakes, and includes a modulator chamber and a primary chamber. The modulator chamber houses a modulator piston valve, and the primary chamber houses a primary input piston which extends into a sleeve chamber of a sleeve. The modulator piston valve controls a modulating fluid flow from the control hydraulic system to generate amplified input forces on the input piston in the primary chamber. These input forces urge the input piston and sleeve toward extended positions, which controls the flow of hydraulic fluid from the main system to the brakes. The modulator piston valve is comprised of a modulator piston and a primary control piston, both being movable between retracted and extended positions and biased toward the retracted position, and a secondary control piston, which is capable of motion between extended and retracted positions.
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Cords Frederick W.
Frye David E.
Commercial Intertech Corp.
Lopez F. Daniel
LandOfFree
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