Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...
Patent
1989-10-30
1991-06-18
Look, Edward K.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Second path activated in response to pressure or flow in...
91 31, 91461, F15B 1304
Patent
active
050241400
ABSTRACT:
The invention is directed to a hydraulic control mechanism for a work vehicle. The work vehicle is provided with a work implement that is operated by a hydraulic actuator. The positioning of the work actuator is controlled by a pilot control system that supplies a pilot control signal to the end caps of a main hydraulic control valve. The mechanism comprises two pressure sensing valves which control the flow of hydraulic fluid from a fixed displacement pump to move the hydraulic actuator, and the flow of hydraulic fluid from a variable displacement pump to hold the hydraulic actuator. The first pressure sensing valve is used to direct fluid from the variable displacement pump to the hydraulic actuator; whereas the second pressure sensing valve is used to decouple one of the end caps of the main hydraulic control valve from the pilot sensing line so that the main hydraulic control valve is shifted to neutral, and blocking the flow of hydraulic fluid from the fixed displacement pump to the hydraulic control actuator.
REFERENCES:
patent: 3987704 (1976-10-01), Johnson
patent: 4453451 (1984-06-01), Streeter et al.
patent: 4781219 (1988-11-01), Haarstad et al.
patent: 4809586 (1989-03-01), Gage et al.
Specification sheet, 648/7433 Grapple Skidder, John Deere; dated Mar. 1988.
Deere & Company
Look Edward K.
Lopez F. Daniel
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