Studies on The Running and Drafting Character of the 4 Wheel Tractor along The Contour Dine on The Slope Field (2)

On The Drafting Character

Abstract

We studied on the drafting character of the 4 wheel tractor along the contour line on the slope field. The test results are as follows;
1. The traction force and the power reduce with increase of the inclination of land. The maximum traction powers are reduced by 80% at 10° in angle of field inclination, 55% at 15° and about 40% at 20° as against that of the level field. The traction forces show similar tendency to above.
2. Judging from the traveling posture of tractor, we resulted that the lowering of the drafting character mentioned above was caused by the followings;
1) Larger running resistance and less component of driving force of wheel, having angle against the running direction on accont of the side slip.
2) Less weight of the hill side wheel by the inclination of tractor body, and less driving force by the action of the differential transmission gear device. And the traction force takes the value represented by the equation (9), and the maximum traction forces are less than two times of the driving force of the hill side wheel. Consequently, on the purpose of the prevention of the lowering of the drafting character, limitation of the skids of body and limited slipping or locking the working of the differential gear device are considered to be effective.