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

1978-12-07

1980-10-21

Wilhite, Billy J.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417269, F04B 4900

Patent

active

042291445

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: 3803987 (1974-04-01), Knapp
patent: 3810715 (1974-05-01), Week
patent: 3857541 (1974-12-01), Clark
patent: 3873240 (1975-03-01), Leduc
patent: 4072442 (1978-02-01), Horiuchi

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