Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1993-03-02
1994-08-02
Casaregola, Louis J.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
60428, F04B 4908
Patent
active
053339975
ABSTRACT:
The invention relates to a power control device for two variable displacement pumps, each with an adjusting device which can be acted upon by adjusting pressure, a power control valve associated therewith, which is acted upon by a first control pressure corresponding with the operating pressure of the variable displacement pump to be adjusted against a pressure difference in the direction of the control position, in which the adjusting pressure loading is controlled in the direction of reduced displacement of the variable displacement pumps along a hyperbolic control curve, whereby the pressure difference results from a spring-arrangement backpressure counteracting the first control pressure and a second control pressure corresponding with the operating pressure of the other variable displacement pump and with increase of the same drops from a maximum value to a minimum value. In order to set the latter value with the device, it is provided in accordance with the invention that the spring arrangement comprises a first and a second pressure spring, the first pressure spring is set to a force corresponding with the minimum value (.DELTA.p.sub.min) and the second pressure spring is set to a force corresponding with the difference (.DELTA.p.sub.max -.DELTA.p.sub.min) between maximum value (.DELTA.p.sub.max) and minimum value (.DELTA.p.sub.min) of the pressure difference, and the first pressure spring with its setting force and the second pressure spring with a force decreasing with increasing second control pressure act upon the power control valve.
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patent: 4949541 (1990-08-01), de Vietro
patent: 5226289 (1993-07-01), Krebs
Blum Manfred
Hormann Werner
Casaregola Louis J.
Hydromatik GmbH
Korytnyk Peter
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