Control systems for hydraulic pumps of the variable displacement

Details Control systems for hydraulic pumps of the variable displacement Control systems for hydraulic pumps of the variable displacement

1992-11-23

1994-03-29

Bertsch, Richard A.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

4172221, F04B 4900

Patent

active

052979415

ABSTRACT:
A control system for a hydraulic pump of the variable displacement type using a pair of coaxially arranged pressure responding pistons. The control system comprises a servo valve for controlling a conduit of pump delivery pressure which is to be applied to a larger chamber of a servo cylinder in response to the pump delivery pressure and external pilot pressure. The servo valve includes a servo spool for controlling the conduit in order to control the pump delivery pressure, a servo sleeve for movably receiving the servo spool, a pump delivery pressure responding piston for biasing the servo spool in response to the pump delivery pressure, an external pilot pressure responding piston adapted for biasing the servo spool in response to the external pilot pressure and being coaxially arranged with the pump delivery pressure responding piston. The lever assembly causes the servo sleeve to move in accordance with the movement of the servo piston. The lever assembly has an inclined surface part for causing displacement of the servo piston as a function of displacement of the pressure responding pistons to show a characteristic hyperbola.

REFERENCES:
patent: 4035105 (1977-07-01), Dantlgraber
patent: 4077744 (1978-03-01), Pensa
patent: 4600364 (1986-07-01), Nakatani et al.

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