| 摘要 |
<p>PURPOSE:To turn with a small radius and run a vehicle without injuring the ground such as a lawn through turning front wheels by providing a control means to clutch off interlocking with detection of a sensor at turning. CONSTITUTION:At turning, when a handle 5 is operated to the left for example, front wheels 7 are rotated around king pins 11 for steering. In this case, as the bracket 22 of a front wheel case 12 is rotationally moved around the shaft part 21 on the axis of the king pin 11, the switch 25 provided on a fitting part 23 is pushed with a cam part 28. When the front wheel reaches the steering angle, the switch 25 is switchovered from off to on, hereby, a clutch off signal is given to solenoid valve 70 by actuation of a control means 72, and a hydraulic clutch becomes off. Consequently, the front wheels 7 become free by cutting off of power transmission to the front wheels 7, a tractor can turn only by driving of rear wheels, and quickly turns with a small radius without injuring the ground.</p> |
