Hydraulic control system

Details Hydraulic control system Hydraulic control system

1977-12-27

1980-06-03

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Plural separately controlled waste passages for single...

91433, 91459, 137486, F15B 1105, F15B 13043

Patent

active

042055920

ABSTRACT:
A hydraulic control system for use in machine tools, construction machines, hoists and the like, with a driven unit the hydraulic circuit of which is controlled by one or more electromagnetically positioned slide valves, and with an arrangement for automatically regulating the velocity of the hydraulic drive unit regardless of fluctuations in the pressure of the oil supply and similar disturbances. The regulating arrangement includes a potentiometer mechanically controlled by a flow meter interposed in the hydraulic circuit; and an electric comparator the inputs of which are connected to the potentiometer and to a desired-flow-value selector, respectively, and the output of which controls the valve electromagnet(s). In this manner the difference signal developed by the comparator is used to change the setting of the valve in a correcting sense. Several implementations for this regulating circuit and for the design of the flow meter and the valves are disclosed.

REFERENCES:
patent: 3141386 (1964-07-01), Loughridge
patent: 3732887 (1973-05-01), Hayner
patent: 3763746 (1973-10-01), Walters
patent: 4004607 (1977-01-01), Freese
patent: 4031813 (1977-06-01), Walters et al.

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