| 摘要 |
PURPOSE:To enable execution of safe and high speed running during turn, by a method wherein a high low speed switching device is mounted to a front wheel driving system, and when one side control of rear wheel brake is detected at a specified steering angle or more, the high low speed switching device is switched to a high speed. CONSTITUTION:When cultivating work in a rice field is effected, a low speed detector 24 is worked, and a hydraulic clutch 35 for low speed is connected for operation. When a vehicle is turned at the end part of a rice field, a handle 18 is operated in a turn direction, and a left brake pedal 20 is operated to operate a left rear wheel brake 19. This operation causes the vehicle to turn around rear wheels 6 serving as a fulcrum. In this case, a turn detector 40 and a one-side brake detector 45 are worked to output a high speed instruction by means of a control circuit 43, and an electromagnetic valve 40 is switched, and a hydraulic clutch 36 for high speed is connected for operation. Thus, the peripheral velocity of a front wheel 5 is increased, and safe and rapid turn with a low radius is practicable.
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