Control change system for a hydraulic working vehicle

Details Control change system for a hydraulic working vehicle Control change system for a hydraulic working vehicle

1991-04-25

1992-06-30

Look, Edward K.

Power plants

Pressure fluid source and motor

Having plural energy outputs

91521, 91530, 13759615, 137635, F16D 3102, F15B 1100

Patent

active

051252325

ABSTRACT:
A control change system for a hydraulic working vehicle having a plurality of hydraulic actuators operable by control levers each shiftable to a plurality of control positions. This system includes a plurality of pilot-operated control valves for controlling pressure oil supply to the hydraulic actuators, respectively, pilot pressure generating valves for generating a pilot pressure in accordance with the control positions of the control levers, and a pilot pressure switching unit for receiving the pilot pressure from the pilot pressure generating valves and outputting the pilot pressure selectively to the control valves. The pilot pressure switching unit includes a plurality of spools slidable to change communicating passages between a pilot pressure input section and a pilot pressure output section of the switching unit.

REFERENCES:
patent: 3556144 (1971-01-01), Bickers
patent: 4111226 (1978-09-01), Cameron
patent: 4398861 (1983-08-01), Shimoie
patent: 4622998 (1986-11-01), Kussel et al.
patent: 4736647 (1988-04-01), Shimoie et al.
patent: 4986165 (1991-01-01), Miyaoka
patent: 5044399 (1991-09-01), Blanz
patent: 5074194 (1991-12-01), Hirata et al.

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