Hydraulic motion control valve and lever

192 clutches and power-stop control – Clutch and brake – Vehicle type

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Details

1376362, 1376363, 192 12C, B60K 4124

Patent

active

058682309

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.

REFERENCES:
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patent: 4404991 (1983-09-01), Cullen
patent: 4421135 (1983-12-01), Harshman et al.
patent: 4938091 (1990-07-01), Waggoner et al.
patent: 5184646 (1993-02-01), Hori et al.
patent: 5209263 (1993-05-01), Hori
patent: 5224589 (1993-07-01), Karakama et al.
Komatsu Parts Manual for D-41 Tractor control linkage, three (3) sheets, (Undated).
Caterpilllar 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).

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