Feedback shaft extending between swashplate and displacement con

Details Feedback shaft extending between swashplate and displacement con Feedback shaft extending between swashplate and displacement con

1981-01-19

1982-12-21

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

91506, F04B 4900, F04B 130

Patent

active

RE0311073

ABSTRACT:
A hydrostatic pump unit is located within a housing which serves also as a hydraulic fluid sump. A displacement control valve for controlling actuators for adjusting the angular position of a swashplate of the pump unit is mounted on the exterior of the housing. Disposed along the axis about which the swashplate is adjustable and joining the swashplate to a shiftable sleeve of the control valve is a feedback shaft which acts to return the valve to a null condition when the swashplate arrives at a commanded new displacement effecting position. The feedback shaft has a passage extending therethrough which acts as a drain connection between the valve and the sump defined by the housing. A check valve is located in the passage for preventing fluid from draining from the housing when the valve is disconnected from the feedback shaft for service.

REFERENCES:
patent: 3299829 (1967-01-01), Jackson et al.
patent: 3332323 (1967-07-01), Roeske
patent: 3406608 (1968-10-01), Diedrich
patent: 3803987 (1974-04-01), Knapp
patent: 3810715 (1974-05-01), Week
patent: 3857541 (1974-12-01), Clark
patent: 3873240 (1975-03-01), Leduc
patent: 3911792 (1975-10-01), Hoyl
patent: 4072442 (1978-02-01), Horiuchi
patent: 4167895 (1979-09-01), Rubinstein
patent: 4248137 (1981-02-01), Caruso

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