The self movement system improvement of a tractor working on farm and forest terrain

Abstract

This study has analysed and assessed the impacts of the constructional
specifications of the moving system of Yanmar F535D rubber tractor to the
traction-gripping capacity and the system stability when the tractor worked
on the steep forest terrain. Based on those specifications, the calculation
methods of improvement and design parameters are identified. The study
results have identified the influent level of gravity center height, basic
width and friction index to the across stability and other working indexs of
Yanmar F535D agrimotor system assembled with a two gang disc plow
working on steep terrain. The designing plan focuses on the improvement
of the self-movement system to reduce the gravity center (ht
) from 1.05 m
to 0.96 m, increase the basic width (B) from 1.30 m to 1.63 m and friction
index (φ) from 0.690 to 0.737. Compared to the original system of the
tractor, the improved system has demonstrated an increment of the across
overturn angle β from 20.8
0
to 31.3
0
; traction efficiency of 8.0%,
productivity of 8.7% and and decrement of labor cost per an area unit of
7.5%. LHM can work at the slope up to 13.6°with the resistance force of
Pc= 4500 N, an increment of 4.5° compared to that of the original system
(9.0
0
). As the result, the improvement self-movement system for some
similar tractors to operate on the steep forest terrain.