Simultaneous Influences of Tyre Pressure and Steering Geometry upon the Theoretical Speed Ratio in the Running Gear System of Four-Wheel Drive Tractors

摘要

The paper develops a mathematical model in order to evaluate the theoretical speed ratio in the running gear system of four-wheel drive tractors, taking account of both the tyre pressure and the turning radius. In using this model, we may emphasize situations when the recirculating power (parasitic losses power) occurs in tractor's transmission due to inequality of wheels' theoretical speeds on the two axles. The paper presents applications of the mathematical model developed for the tractor MAT 81, manufactured in Craiova, Romania.