Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1976-11-03
1978-10-31
Croyle, Carlton R.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
60405, 60450, F04B 4900
Patent
active
041232020
ABSTRACT:
A hydraulic pumping arrangement for pumping a liquid to a hydraulic system, which comprises pumping means for pumping the liquid, swash means including a variable swash member which enables the liquid output of the pumping means to be infinitely varied between minimum and maximum, a first piston-and-cylinder arrangement for increasing the position of the swash member to increase the liquid output of the pumping means, a second piston-and-cylinder arrangement for decreasing the position of the swash member to decrease the liquid output of the pumping means, control means for controlling the flow of liquid for the second piston-and-cylinder arrangement, switching means operative to pass liquid from the system to the control means at a first condition in the system and operative to stop liquid from the system passing to the control means at a second condition in the system, and valve means for isolating the pumping arrangement from the system and from a main pump normally supplying liquid to the system, the control means being operative when it is receiving liquid from the switching means to enable the swash member to be moved to an on-swash condition and therefore the pumping means to pump liquid to the system in the event of a lack of liquid output from the main pump.
REFERENCES:
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Hudson John A.
James Nicholas A.
Morley Edward G.
Savage Derek G.
Croyle Carlton R.
Look Edward
Plessey Handel und Investments AG
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