| 摘要 |
PROBLEM TO BE SOLVED: To reduce the load of a steering wheel operation by interlocking a power steering hydraulic changing means to the elevation height of a planting part. SOLUTION: When a planting part 15 is worked in a deep field, a flow rate throttle taper pin 63 is pulled by the extending pressing of an outer wire 67 according to the stretching of an inner wire 68 in order to reduce the vertical height of the planting part 15. The hydraulic flow rate of a steering cylinder is increased through a steering valve 62, and the steering load of a steering wheel 14 is minimized to lighten the operation of the steering wheel 14. Since the vertical height of the planting part 15 is increased in a shallow field, the outer wire 67 and the inner wire 68 are loosened, the flow rate throttle taper pin 63 is returned to the initial position to reduce the hydraulic flow rate of the steering cylinder 42, and the steering load of the steering wheel 14 is increased to make the operation of the steering wheel 14 heavy. |
