Studies on the Driving Performance of Walking Tractor (II)

Characteristics of Plowing and Rotary Tilling

Abstract

The plowing and the rotary tilling tests were performed by using the walking tractor attached with the Japanese plow and the rotary tillage apparatus.
The characteristics of the plowing and the rotary tilling were summarized as follows.
Plowing.
1) The draft resistance increased as the depth was increased, and there was no definite relation between the draft resistance and the travel speed.
2) The torque of right wheel shaft was 1.2-1.5, times as large as left wheel shaft.
3) The dynamic weight on the driving wheel decreased as the draft resistance was increased, while the dynamic weight on the heel of plow increased as the draft reistance was increased.
4) The tractive power coefficient became maximum of 0.35 at the coefficient of traction of 0.50 (the travel reduction 0.32) and the tractive efficiency became maximum of 0.53 at the coefficicient of traction of 0.32 (the travel reduction 0.21).
Rotary tilling.
1) The rotor shaft torque increased as the depth and the travel speed were increased, while it generally decreased with an increase in the rotor speed.
2) The wheel shaft torque decreased as the depth and the travel speed were increased because of propulsion by tines.
3) As the wheel shaft power was nearly zero, about 95% of the main shaft power was consumed in the tilling parts.
4) It was recognized that the dynamic weight on the depth adjusting wheel was heavier than the static weight on it, while the dynamic weight on the driving wheel was lighter than the static weight on it.