Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1998-10-26
1999-08-17
Michalsky, Gerald A.
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
137556, 1376362, 1376363, F16K 1118, F16K 3700
Patent
active
059378972
ABSTRACT:
The present invention provides a hydraulic motion control or pilot valve and lever assembly for controlling the transmission and steering of a work vehicle such as a crawler tractor, articulated wheel loader or like construction vehicle. The motion control valve and lever assembly is a compact assembly that employs a single lever mounted directly to a valve in order to control the forward and reverse motion of the vehicle, the steering of the vehicle in a left, right or straight direction, and the speed or gear selection of the vehicle. The valve assembly is provided with eight hydraulic signal ports, at least one reservoir port, and at least one pressure supply port. The assembly further has four control spools positioned in respective control spool chambers spaced approximately ninety degrees apart and a fifth control spool positioned in a fifth, central spool chamber. A two-way pivot interconnects the fifth control spool and the control lever so that the control lever may pivot about two axes with respect to the fifth control spool. A cam assembly mounted to the control lever comprises a cam positioned adjacent first ends of the four control spools, a cam bracket mounted to the cam, and a bearing disposed between the cam bracket and the control lever so that the control lever may rotate axially with respect to the cam assembly. When the control lever rotates axially, it in turn causes a corresponding axial rotation of the fifth, central control spool.
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Komatsu Parts Manual for D-41 Tractor control linkage, three (3) sheets, (undated).
Caterpillar Tractor Co. "Supplement D6H And D7H Series II And D8N Tractors Differential Steering Control Supplement", four (4) sheets: cover page and pp. 12, 30, and 31, (undated).
Chatterjea Probir Kumar
Dunn Robert Charles
Fiorito Edward G.
Kamatsu America International Company
Michalsky Gerald A.
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