Studies on the Running and Drafting Character of the 4 Wheel Tractor along the Contour Line on the Slope Field (III)

On the Effect of the Differential Locking on the Drafting Character of the Tractor

Abstract

The drafting force of the 4 Wheel tractor with the differential gear running along the contour line becomes less under the larger inclination of the field. Then we studied on the increasing performance of the drafting force on the case of the differential locking.
Theoreticalily, the expecting value by the differential locking is expressed in ΔP=(N_c-N_D)μmax cosα where, ΔP; increasing drafting force by the differntial locking,
N_c and N_D; the loads on the lower and the upper part wheels, respectively,
μ; the driving coefficient between the wheel and the land surface, α; the deflection angle of the tractor body for the contour line.
From the test results, on the larger inclination of the field, ΔP becomes larger by the differential locking because N_c becomes larger and N_D becomes less. But because the driving force is not deviled into equal values on the both driving shaft, the decreasing drafting forces is less under the no differential locking, and the increasing drafting force is also less under the differential locking, compared with the theoretical values, respectively.
The effects of the drafting force under the differential locking were like as the next table on the maximum coefficient of the driving force;
The ratio of the load on the wheels (%) (Nc-ND/Nc+ND×100) Increasing ratio on the maximum coefficient of the driving force (%)
2 0
6 0
17 10
23 12
28 10