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Elastic wheels contain the chassis of airplanes, automobiles and other vehicles. Their tires interact with a solid supporting surface – roads and airfields. As a result of this interaction, only static friction, only sliding friction or a combination of them, depending on the mode of the wheel movement, can be present in the contact patch. The geometric dimensions and relative position of the different friction areas determine the stable, unstable or boundary movement of the elastic wheel. Purpose of work: calculation and measurement of geometric characteristics of static and sliding friction areas in the wheel-to-road contact. Determined that: the slip area appears on the longitudinal axis of the contact patch, at a distance from the center of the contact patch equal to 1/4 of the length of the contact patch, then it increases due to a decrease in the static friction area; the center of the static friction area in the contact patch moves toward the current moment by an amount proportional to the moment; the maximum displacement of the center of the static friction area corresponds to the moment maximum in terms of adhesion, and is 1/3 of the length of the contact patch.

The paper deals with the study of the reaction positions of the support surface on the vehicle wheels. The problems is that the longitudinal drifts of the normal reaction are not fully described. There is no initial data on the rolling radii in the presence of a moment on the wheel. The existing problem does not allow considering components of the longitudinal drifts of normal reactions. The authors noted that the accuracy of predicting the stability and controllability of the vehicle deteriorates. The way out of this is to search other ways to determine the values of these drifts. In conclusion, the authors admitted dividing the general drift of the normal reaction into three components. The paper proposes a measurement method to determine the existence and numerical value of the third component. This method includes indirectly measuring the normal reaction drift that was implemented on an experimental setup.

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