F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
138/73, 137/88
F16H 39/00 (2006.01)
Patent
CA 1100016
HYDRAULIC CONTROL SYSTEM Abstract of the Disclosure A hydraulic control system is provided including a fluid reservoir, a variable displacement pump having a fluid input in fluid communication with the reservoir and having a fluid output, and a fluid actuated displacement control mecha- nism for controlling the displacement of the pump. A control valve is placed in fluid communication with the fluid output of the variable displacement pump and with the reservoir and is adapted to control the flow of fluid to a fluid actuated device. The control valve includes means for developing a control pressure signal. A sensor valve is placed in fluid communication with the control pressure signal, the displace- ment control mechanism, and the reservoir for placing the con- trol pressure signal in fluid communication with the displace- ment control mechanism or for placing the displacement control mechanism in fluid communication with the reservoir, in response to the magnitude of the pressure control signal, thereby control- ling the displacement of the pump in response to the magnitude of the pressure control signal. The control valve includes a plurality of plungers for controlling the flow of fluid between a central passageway, a supply manifold, service ports, and an exhaust manifold. Each of the plungers includes a plurality of metering notches for providing the only continuous flow path through the central passageway between the inlet and the exhaust port when the plungers are between a neutral position and an operating position. The fluid actuated displacement control mechanism is mechanically connected to the pump for controlling its displacement. The mechanism is provided with a fluid passage for placing the mechanism in fluid communication with the pump drain. The fluid passage includes a flow restriction which varies in response to the position of the mechanism.
360220
Borden Ladner Gervais Llp
General Signal Corporation
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