EFFECT OF TIRE TREAD PATTERN WEAR ON TIRE GRIP UNDER TEST BENCH BRAKING IN A LOCKED MODE

Abstract

The PURPOSE of the article is to carry out an experimental study of the effect of the tire tread pattern wear on the implemented coefficient of adhesion to the support surfaces of the test bench under the variation of normal load value. METHODS. The studies were performed on the test bench of modular design, which allows to measure the normal and tangential reactions of the elastic tire with support surfaces. RESULTS. It has been determined that the increase of the tire tread pattern wear from 10 to 90% reduces the adhesion coefficient of the automobile wheel elastic tire by 35.3% when braking in the locked mode on a flat support surface. When the wheel brakes on one support roller of the test bench and the tread wear is from 10% to 90% the adhesion coefficient reduces by 18%. When the wheel brakes on two support rollers of the test bench the coefficient of adhesion makes 23.8% on the front roller and 48.4% on the rear support roller of the stand, with an increase in the wear of the tread pattern from 10% to 70%. CONCLUSION. The conducted experimental studies allowed to determine the dependence of the adhesion coefficient of the elastic tire on the wear degree of the tire tread pattern and the variation of normal load under the locked wheel braking on the flat support surface and one or two support rollers.