Tractive Performances of Wheel-Type Tractor (VII)

Deflections and Deflection Resistances of Tire

Abstract

The deflections of the tractor tire, the diameter and width increases, under the various loads and inflation pressures were tested. And the energy when the tire was deflected on the smooth surface was measured by the traction method on the concrete floor in the laboratory
The heights of rubber part of the tire y had the relations with the inflation pressure x as y=Ax^B. The heights were rapidly increased with the inflation pressures when the tire had the pressures below 0.5kg/cm² as shown in fig. 2. Width was decreased with the inflation pressures under the small loads, while it was increased under the large loads. Below 0.5kg/cm² of the inflation pressure the width was increased rapidly.
Energy for the deflection of the tire, in other words the rolling resistances caused by the tire deflection on the smooth surface y, had the relation with the inflation pressure x as y=a/x^b as shown in fig. 10