Tribological Optimization Design Of Angular Contact Ball Bearing

Bearing is one important basic part as well as an independent mechanical product. It has important effects on accuracy, performance, life and reliability of mechanical products. Bearing technologies in China are far behind those in such countries owning advanced technologies. Including automobile industry, developments of industries in China are changing from quantity to quality. Such trends supply opportunities for quality improvement of bearing industry. The optimization design of bearing structure has advantages to improve the quality of bearings. To improve the bearing’s fatigue life and vibration characteristics, dynamic load rating and static load rating were set as objective functions to optimize bearing’s structures in this thesis.Part one introduced industrial backgrounds of optimization design on the angular contact ball bearing’s structures and the feasibility of optimization design. The tribological developments of angular contact ball bearings were reviewed as well as the developments of genetic algorithm and immune algorithm.Part two established fatigue life model of ball bearing. In the analyses of Mises stresses in subsurface, tangential friction force was taken into consideration; and thus, relative fatigue life of angular contact ball bearing was determined. The effects of ball diameter tolerance, race way conformity and radial internal clearance were all analyzed.Part three established contact model of double-row angular contact ball bearing. Based on the model, the load distributions and variations of contact angle of the bearings under different kinds of load were numerically computed.Part four established optimal design model. For dynamic load rating and static load rating as objective functions, double-row angular contact ball bearings were optimally designed using genetic algorithm; the influences of crossover and mutation operators on optimal results were discussed. The optimum results for17kinds of angular contact ball bearings were obtained, and they were compared with their designs in the handbook of rolling bearings.Part five, the author took weight factors for dynamic load rating and static load rating, and determined the objective functions. Bearing3210and3218were optimally designed; For optimization design, genetic algorithm and immune algorithm on convergence speed and stability were comparatively studied.Part six summarized the work of this thesis and put forward some further research directions.