Effects Of Geometric Error Of Elements On Mechanical Performance In Cylindrical Roller Bearing

With the development of technology and science, the cylindrical roller bearing is widely used as one of the key parts of the machine tool spindle, aero-engines etc. Application fields put forward high standards for accuracy and stiffness of rolling bearing. The research on the mechanical characteristic of cylindrical roller bearing is essential.Based on the cylindrical roller bearing for research object in this paper, the geometric errors contain diameter error of roller, geometric roundness error of inner and outer raceway. The geometric error of raceway is described by Fourier series, and diameter error of roller is distributed by scattering number.According to kinematics and geometric relations of bearing elements, the mathematical model of cylindrical roller bearing is set up under the free state, which can analyze the relationship between the geometric error and the rotative accuracy. The rotative accuracy can be evaluated by the offset of ring. The result shows that, with the decrease of geometric error, the rotative accuracy of bearing decline. With constant roundness error magnitude and roundness error degree increasing, the rotative accuracy is decreased. With appropriate relationship between the arrangement of diameter error of roller, roundness error degree of raceway and the number of rollers, the rotative accuracy is improved.A static model is developed to investigate the effects of geometric error among elements on the load performance and rotative accuracy under the radial load. By introducing a pair of nonlinear springs for contact of each roller with its inner and outer raceway, the equations of model are solved using Newton-Raphson algorithm. The results show that, the geometric roundness error of raceway affects the load distribution; the error of single roller affects the amplitude of roller loads, the errors of multiple rollers affect the number of roller loads. The geometric errors affect the rotative accuracy of bearing under constant radial load.The research results develop the analysis on the rotative accuracy and load distribution of roller bearing, play an active role in designing the high-accuracy bearing products.