Machinery & Energetics

In the tractor and automobile theory conditional quantitative description of wheel rolling resistance, which is determined as a relation of rolling resistance wheel force to his normal loading and named of rolling resistance wheel coefficient, is used. It is offered by researchers a number of methods, receptions and construction of equipment which allows determining this index experimentally for determination of this parameter. In this article the analysis of existent methods of rolling resistance wheel force and coefficient determination is executed, and also factors which affect the value of these parameters under various conditions to exploitation of mobile power and transport facilities. The executed analysis allowed to do a conclusion about that from a plenty of factors, and also enormous diversity of both types and types of tires, and states and types of supporting surfaces and other factors, that affect the size of rolling resistance wheel force and coefficient, and also taking into account complication of process of co-operation of wheel with a supporting surface, to this time there is no analytical model of computation of the last for the general case. Therefore afore-mentioned indexes are determined by experimental methods exceptionally. But taking into account, that constructions of pneumatics and technology of their making during the last decade changed substantially, that obviously affected their properties and descriptions (parameters), there is a necessity in clarification of rolling resistance wheels coefficients of different mobile machines (tractors, cars and other machines). Taking into account the present failing in existent methods and devices for experimental determination of rolling resistance of wheel force and coefficient, there are backlogs for their perfection that will allow promoting exactness of registration of necessary parameters.

coefficient, force, resistance, rolling, wheel, tire, pressure, dynamometer