F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/13
F04B 49/06 (2006.01) F15B 13/16 (2006.01)
Patent
CA 1136485
FEEDBACK SHAFT EXTENDING BETWEEN AND DISPLACEMENT CONTROL VALVE Abstract of the Disclosure 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 com- manded 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.
339100
Johannsen Donald O.
Kass John J.
Borden Ladner Gervais Llp
Deere & Company
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