Dual pressure displacement control system

Details Dual pressure displacement control system Dual pressure displacement control system

F - Mech Eng,Light,Heat,Weapons

04

B

138/62

F04B 1/08 (2006.01) F03C 1/06 (2006.01) F04B 49/00 (2006.01)

Patent

CA 1273268

ABSTRACT A dual pressure source, or selectively alternative high pressure source, control system for a variable displacement hydraulic unit (MR or ML) servo mechanism (22-28) wherein normal control of the unit is provided by the low pressure source (46), such as a transmission charge pump, and wherein a high pressure source (50) of the control fluid with a restrictive orifice (64) is provided to initiate servo movement, especially under conditions generating high internal friction. The flow restrictive orifice (64) generates a pressure drop in a high pressure control line (50) once the servo mechanism (22) 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 (60) selected highest pressure of a transmission main loop (56-58) incorporating the hydraulic unit.

527522

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