PROBLEMS OF IMPROVING OF DYNAMIC MODELS OF CYLINDRICAL ROLLER BEARINGS

Abstract

Designing of construction of a bearing cage base on empirical data does not provide an opportunity to assess the impact of many structural and operational factors. Therefore, there is a need to develop analytical models of the functioning of roller bearings in order to determine the magnitude of the loads imposed on the separator by bearing parts. For this purpose, it is necessary to improve the models of the statics, kinematics and dynamics of bearing heads. This article examines high-capacity bearings with straight rollers of the normal accuracy grade, which, unlike bearings with taper rollers, allow higher operating speeds. The lack of a scientifically based model of the kinematics of straight roller bearings of the normal accuracy grade does not allow building an adequate model of their dynamics and therefore assessing the performance of their parts, which affects the reliability of machine support units. The analysis of the technical literature enables revealing that the vast majority of the articles on dynamics models are devoted to the speed group, which is used in the aviation and space industries. The dynamics of low-speed straight roller bearings under heavy operating conditions are the most extensively studied for the supporting units of the rolling stock of railway transport. We have determined the basic tasks for improving the dynamics models of low-speed straight roller bearings of normal accuracy grade, which are aimed at optimizing the kinematics models and studying the dynamics of the bearings in the areas loaded and unloaded by external forces, taking into account misalignment of the rings and deformation of the cage. The task of improving the dynamics models will include the development of 3D models of the interaction of the cage with the rollers in the radial load area, as well as the cage with the base ring, taking into account misalignment of the parts. New models of the bearing dynamics enable determining the forces of interaction of the parts under any operating mode to assess their performance and design optimal constructions of the cage. Key words: roller bearing, dynamics models, radial load area, cage, rollers