Sutdies on the Skidding of Wheel (1)

Directional Properity of Frictional Resistance of Pneumatic Tire

Abstract

The theoretical study on the side force of automobile pneumatic tire was developed by E. Fiala, as the dynamic frictional resistance was constant in any direction of tire on the ground surface. But due to some papers that reported the difference between the values of resistance in the direction of revolving surface and transverse, the directional property was studied, in this paper, on both smooth and agricultural tires.
Main results were as follows;
1. The maximum frictional resistance was constant in any direction on both tires.
2. The dynamic frictional resistance varied depend on the derection of tire. In this test, the value was indicated by the half length of diameter of elliptical shape, which took the major axis in the direction of revolving surface of tire on the smooth tire, and in the direction of lug angle on the agricultural tire
3. The maximum frictional resistance became large with the increase of tire inflation pressure but dynamic frictional resistance took the maximum value at the certain pressure.