Study on Turning Operation of Power Tiller
Effects of the Mechanical Turning Device
1981 Volume 43 Issue 1 Pages 45-50
Details
1981 Volume 43 Issue 1 Pages 45-50
The trouble in the operation of power tiller is the great need of human power. And the desire to be freed of it is a main factor of farm tractorization. The operating power spent by hand lifting of tillage unit and hand steering for turning was examined, considering general patterns of turning operation.
In the case of spring tillage, force needed for lifting of tillage unit was 12-30kg. It had a tendency that the values were in proportion to the dimensions of the body of power tiller.
At the practical tillage in the field, the force is generally lower by the effect of soil reaction than that of stationary state. But it might be said to get higher force than at parked one when tilling depth was shallow, the field was in loose soil condition or some types of tillage blades was equipped. Tilling depth and tilling pitch also gave considerable effect.
Steering force for turning was under influence of running speed, and in a larger turning radius than tread width no steering force was necessary if the rolling of turning-side wheel is hold in check.
As a way for easy turning operation, a mechanical turning device was made which equipped with lifting device for tillage unit and steering device of side clutch-brake system. Using these devices, the RMR value was decreased by 3.0-3.5 than that in human turning.
