Variable-output pump control arrangement

Details Variable-output pump control arrangement Variable-output pump control arrangement

1976-04-07

1977-07-12

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417274, 418 26, F04B 4908

Patent

active

040351050

ABSTRACT:
A variable-output pump has an output-adjusting element which is acted upon by a differential piston arrangement having oppositely facing active surfaces of a smaller and of a larger active area. Control fluid is permanently admitted to the smaller active area of the differential piston arrangement to act on the same and urge the output-adjusting element of the pump toward a low-output position. A biasing spring acts against the force of the fluid acting on the smaller surface, and the control fluid is also selectively admitted to the larger surface to urge the adjusting element toward higher outputs. A control slide controls the admission of the control fluid to the larger surface of the differential piston arrangement and has a housing provided with a bore in which a slide is mounted for movement longitudinally of the bore. The slide has an end face acted upon by the control fluid and another end face acted upon by a spring. The slide has a plurality of compartments separated from one another by lands having control edges. The control fluid flows through the slide into two of the compartments, and a third compartment communicates with a relief conduit. One of the lands cooperates with a port through which the control fluid is admitted to the larger surface of the differential piston arrangement, and one of the control edges on this land has a diverging notch which circumvents this control edge when the land is juxtaposed with the port to permit a limited flow of the control fluid therethrough. The pressure of the control fluid is indicative of the performance of the pump; the fluid pumped by the pump may be used as such control fluid.

REFERENCES:
patent: 2056896 (1936-10-01), Douglass
patent: 2238062 (1941-04-01), Kendrick
patent: 2740256 (1956-04-01), O'Malley
patent: 3467017 (1969-09-01), Hetz et al.
patent: 3523746 (1970-08-01), Dadian et al.

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