Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1998-04-30
2000-02-29
Freay, Charles G.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
F04B 4908
Patent
active
06030183&
ABSTRACT:
A variable margin pressure control for a variable displacement load sensing pump comprises a body having a bore therein and a valve spool slidably disposed in the bore defining a chamber in continuous communication with a discharge passage in the body. The valve spool is movable in a first direction for communicating the discharge passage with a control port in the body and in a second direction for communicating the control port with an exhaust flow path. The valve spool is biased in the first direction by discharge fluid pressure in the chamber. A spring mechanism biases the valve spool in the second direction against the force generated by the discharge pressure with a biasing force sufficient to establish a predetermined margin pressure. A remotely controllable variable biasing force is applied against the valve spool by a device so that the margin pressure can be selectively varied in response to receiving a pressure signal. Another devices applies a load pressure generated biasing force against the valve spool in the second direction so that the margin pressure is maintained throughout the pressure operating range of the pump.
REFERENCES:
patent: 3987622 (1976-10-01), Johnson
patent: 4147034 (1979-04-01), Johnson
patent: 4196588 (1980-04-01), Johnson
patent: 5562424 (1996-10-01), Manring
patent: 5567123 (1996-10-01), Childress et al.
patent: 5839885 (1998-11-01), Oda et al.
Caterpillar Inc.
Freay Charles G.
Grant John W.
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