Pump drive speed regulator with control-pressure-generating valv

Details Pump drive speed regulator with control-pressure-generating valv Pump drive speed regulator with control-pressure-generating valv

1988-04-22

1989-09-05

Garrett, Robert E.

Power plants

Pressure fluid source and motor

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

60431, 60433, F15B 1116, F04B 4900

Patent

active

048626910

ABSTRACT:
Speed regulation of pump drive is set by a pressure-regulating valve providing a constant control pressure for a plurality of normal loads. If a high fluid consumption load such as the lifting cylinder of a forklift truck is to be simultaneously actuated the pump speed and net volumetric displacement must be increased. A higher speed-regulating control pressure from the pressure-regulating valve is required. The control valve for the high consumption load has a spool with an extending inclined cam contacting the biasing spring of the pressure-regulating valve. Upon actuation of this control valve the preload of the biasing spring is increased thereby adjusting the speed-regulating control pressure output of the pressure regulating valve. The pump engine or drive speed and the net volumetric displacement are increased.

REFERENCES:
patent: 3360925 (1968-01-01), Zimmerman
patent: 4118149 (1978-10-01), Hagberg
patent: 4400939 (1983-08-01), Moranduzzo et al.
patent: 4596118 (1986-06-01), Heiser
patent: 4635440 (1987-01-01), Kropp
patent: 4716727 (1988-01-01), Kotter
patent: 4733533 (1988-03-01), Deininger et al.
Nikolaus, H. "Hydrostaticher Lenk-und Fahrantrieb fur Kettenfahrzeuge", in Oilhydraulique und Pneumatik, 18:9, pp. 667-70, (1974).

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