Abstract:
Cylindrical roller bearings are widely used in mechanical equipment. The inner and outer rings of such bearing are usually tightly fitted when assembling, which results in expansion of the inner ring and shrinkage of the outer ring, thus affecting the mechanical properties of the bearing. In this paper, based on the mechanical analysis and the thick-walled cylinder theory, a calculation model is established, which can be used to calculate the contact stress between the roller and raceways and calculate the axial orbit with considering the assembly interferences of inner and outer rings. An algorithm for numerical calcultion based on this model under different clearance values is constructed, and the force of each roller of cylindrical roller bearings can be accurately calculated. Upon using the established algorithm, taking the cylindrical roller bearing NU306E as an example, influences of assembly interferences of inner and outer rings on the contact stress and the axial orbit are studied, and curves of the maximum contact stress and the axial orbit are drawn. It is found that when the initial clearance keeps constant, as the interference increases, the range of the contact stress of the roller increases gradually. The maximum value of the contact stress of the roller decreases gradually. When the interference increases to a certain extent, the roller is stressed over the entire circumference, and the maximum value of the roller contact stress is increased significantly. When the bearing assembly interference keeps constant, as the initial clearance increases, the range of the roller contact stress decreases gradually, and the maximum value of the contact stress increases gradually.