Abstract
The proposed scientific work considers and substantiates a new approach to selection of rational values of basic geometrical parameters of interference fit at their automated design – a fitting diameter and working length. A geometric and analytical model of the area was constructed, in which there are values of the basic parameters of fit. Then, numerical and analytical researches of this model were carried out. Based on the results of this research, an analytical criterion for choosing rational values of geometric parameters is formulated. The proposed method is based on the definition of the center of intersection of the largest segments of the permissible ranges of changes in the values of diameter and working length. This center is represented as some coordinate point within the model in the two-dimensional coordinate system. The coordinate axes of this model use the fitting diameter and the fitting length. The position of this point is analytically described using the mathematical apparatus of the theory of R -functions. These parameters are used in the automated design of the interference fits on the smooth cylindrical surface for jointed components of the direct engagement mechanical gears, for example, for the bandage joint of the ring gear to the wheel hub. This does have a keyless joint, the torque is fully transmitted by the friction forces in the fit. Such joints are used in the units and mechanisms used in small arms and artillery and military equipment, as well as other technical products of general-engineering purpose at various methods of assembly by a method of full interchangeability. The effectiveness of the method is shown in a specific example of numerical calculation, the results of which are obtained using the software developed by the team of authors of this work
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