Load responsive system with area change flow extender

Details Load responsive system with area change flow extender Load responsive system with area change flow extender

1974-10-23

1976-02-10

Cohan, Alan

Motors: expansible chamber type

Differential

60462, 91414, 137117, 13759613, F16B 1308

Patent

active

039371298

ABSTRACT:
A load-responsive hydraulic system is provided in which the effective output of a fixed displacement pump is controlled by a bypass valve having three fluid-responsive areas.
The first fluid-responsive area is pressurized by pump pressure; and the directional control valve of the system includes a first fluid flow path which pressurizes the second fluid-responsive area with the load-actuating pressure of a fluid motor when the fluid motor is receiving pressurized fluid from the pump. Thus, the bypass valve is load responsive.
The directional control valve also includes a second fluid flow path which controls a fluid pressure which is applied to the third area; so that, the force balance of the bypass valve is changed by the force developed by the third area; and the difference between pump pressure and load-actuating pressure, while operating the system, is greater than the difference between pump pressure and sump pressure at standby.

REFERENCES:
patent: 3592216 (1971-07-01), McMillen
patent: 3722543 (1973-03-01), Tennis
patent: 3878864 (1975-04-01), Schurger

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