Pump displacement control for a variable displacement pump

Details Pump displacement control for a variable displacement pump Pump displacement control for a variable displacement pump

1995-09-12

1996-10-22

Thorpe, Timothy S.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

F04B 4908

Patent

active

055671233

ABSTRACT:
A pump displacement control for a variable displacement pump includes a torque control valve disposed between a variable torque limiter and a force applying device disposed in axial alignment within a common bore. A sleeve and a valve spool are movable relative to each other to establish a first condition communicating discharge pressure into an actuator chamber to move a swashplate toward a minimum displacement position against the bias of a spring or a second condition communicating the actuating chamber with an exhaust passage to allow the spring to move the swashplate toward its maximum displacement position. A torque control piston disposed between opposing springs resiliently bias the valve spool in a direction to establish the second condition when control fluid is directed into a control chamber. Pump discharge pressure communicated into a pressure chamber exerts a force against the valve spool proportional to the discharge pressure so that the valve spool moves in a second direction to establish the first condition when the control force exceeds the biasing force exerted by the torque limiter.

REFERENCES:
patent: 4245962 (1981-01-01), Uehara et al.
patent: 4498847 (1985-02-01), Akiyama
patent: 4599050 (1986-07-01), Ishizaki et al.
patent: 4600364 (1986-07-01), Nakatani et al.
patent: 4637781 (1987-01-01), Akiyama et al.

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