Influence of tire tread pattern wear on characteristics of its longitudinal adhesion with bearing surface

Abstract

The aim of the research was to carry out the experimental study of the influence of tire tread pattern wear on characteristics of the longitudinal adhesion with the bearing surface in order to detect functional relationships of the adhesion coefficient against the value of tread pattern wear and the value of normal load. The experiments were carried out according to the original methodology on the laboratory tester of a modular type that allows studying the processes occurring in the elastic tire area contacting with the flat, one cylindrical, two cylindrical bearing surfaces. The experimental research allowed obtaining the 35.3% decrease of the longitudinal coefficient of elastic tire adhesion while increasing the value of tread pattern wear from 10% to 90%. The study of brakeage of the wheel with elastic tire on one bearing roller showed the 18% decline of the adhesion longitudinal coefficient with the tread pattern wear varying from 10% to 90%. During the wheel braking on two bearing rollers and the tread pattern wear increased from 10% to 70% the longitudinal coefficient of adhesion fell by 23.8% on the front bearing roller and by 48.4% on the rear roller. The result of the given research is detected functional relationships of adhesion longitudinal coefficient against the values of tread pattern wear and normal load for three types of the bearing surfaces.