Dual pressure displacement control system

Details Dual pressure displacement control system Dual pressure displacement control system

1986-01-24

1988-02-02

Weakley, Harold W.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60426, 60444, 60452, 60484, F16D 3102

Patent

active

047221860

ABSTRACT:
A dual pressure source, or selectively alternative high pressure source, control system for a variable displacement hydraulic unit servo mechanism wherein normal control of the unit is provided by the low pressure source, such as a transmission charge pump, and wherein a high pressure source of control fluid with a restrictive orifice is provided to initiate servo movement, especially under conditions generating high internal friction. The flow restrictive orifice generates a pressure drop in a high pressure control line once the servo mechanism starts to move, inducing flow through such line. Thus, the control system provides a momentary source of high pressure fluid but permits control rate changes which are substantially independent of the hydraulic unit working pressure. Preferably, the high pressure source is a shuttle selected highest pressure of a transmission main loop incorporating the hydraulic unit.

REFERENCES:
patent: 3499285 (1970-03-01), Nicholle
patent: 4376371 (1983-03-01), Kojima
patent: 4480963 (1984-11-01), Ring
patent: 4627239 (1986-12-01), Nighimone

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