Motor vehicles – Steering by driving – Endless flexible track
Patent
1992-12-21
1994-07-05
Johnson, Brian L.
Motor vehicles
Steering by driving
Endless flexible track
180 944, 192 13A, B62D 1108, F16D 6704
Patent
active
053259335
ABSTRACT:
A steering control system for a tracked vehicle having a left track and a right track, e.g., a bulldozer, assures smooth turning performance in a normal steering operation, provides a comfortable ride, and is durable. Power is transmitted to the right and left tracks via right and left drive sprockets having right and left driving shafts, with the right driving shaft being coupled to an output shaft of a speed change gear via a right clutch and a right brake, and the left driving shaft being coupled to the output shaft via a left clutch and a left brake. The steering control system includes electrically actuated proportional control valves (19R, 19L, 20R, 20L) for separately controlling the right clutch, the left clutch, the right brake and the left brake; a steering lever (15); a steering signal generator (15a) for generating a steering signal corresponding to the operation of the steering lever; and a controller (17) for inputting the steering signal and for outputting a steering control signal to the electrically actuated proportional control valves (19R, 19L, 20R, 20L). The time interval from the disengagement of a clutch to the engagement of the associated brake is controlled to obtain smooth steering characteristics.
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Johnson Brian L.
Kabushiki Kaisha Komatsu Seisakusho
Zeender Florian
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