Hydraulic control system having poppet and spool type valves

Details Hydraulic control system having poppet and spool type valves Hydraulic control system having poppet and spool type valves

1992-01-15

1993-05-04

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60484, 91461, 91443, 91444, 91445, 91464, 91448, 13759614, F16D 3102

Patent

active

052070590

ABSTRACT:
Hydraulic control systems are useful for controlling actuation of hydraulic motors. Some such systems use spool type valves while other systems use poppet type valves, both of which have their advantages and disadvantages. The present hydraulic control system is a hybrid system utilizing a combination of both a spool type control valve and poppet type control valves in a single work circuit. Specifically, a spool type control valve has an inlet port connected to a variable displacement pump and a pair of flow amplifying poppet type valves are serially disposed between a pair of motor ports of the spool type valve and a pair of actuating chambers of a double acting hydraulic motor. The spool type control valve is operative to control pump-to-motor flow while one of the poppet type valves is operative to control motor-to-tank flow.

REFERENCES:
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patent: 4967557 (1990-11-01), Izumi et al.
patent: 5046309 (1991-09-01), Yoshino
patent: 5137254 (1992-08-01), Aardema et al.
patent: 5138838 (1992-08-01), Crosser

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