Optimization And Anti-fatigue Design Of Cylindrical Gear Reducer

With the continuous research and development of various types of mechanical equipment,power transmission is essential.And as an important transmission parts,the role of the reducer is becoming more and more important.If the reducer is of fatigue failure,it will have a significant impact on the operation of the mechanical equipment.So it is very important to analyze the fatigue optimization of the reducer.In this paper,the theory of fatigue damage,the finite element method and the theory of structural optimization design are used as the theoretical guidance.The static strength analysis,optimization design and fatigue life analysis of the key components of the cylindrical gear reducer are carried out by using ANSYS finite element analysis software.The research results will have some reference significance in the design of reducer in real engineering.The following is the specific contents of this paper:(1)The research status of fatigue design,optimal design and reducer are introduced,and the optimization design method,finite element theory,fatigue life analysis theory and so on are summarized.The parametric design of gear drive parameters of reducer is carried out in this paper.The initial model of reducer is designed according to the optimization results.(2)The traditional design calculation and the finite element static strength analysis to the gear of the reducer are carried on,and the analysis results of the tooth bending strength and the contact strength of each gear are compared with the theoretical calculation.The result shows that: the strength and stiffness of the gear teeth of the gear reducer meet the design requirements.Through the analysis of the influence of the gear root transition fillet on the bending strength of the gear,it is found that the fillet has a great influence on the bending strength of the gear.(3)Based on the initial model of the reducer,the gear shaft is optimized,and the dimension of the gear shaft is obtained.The topology optimization of the gear and the box body is carried out,which is based on the minimum of the structural flexibility.Through the analysis of the optimization results,the new structure design of the gear and the box body is carried out.The static strength analysis of the new structure shows that the strength and stiffness of the gear and box design structure meet the design requirements,which lays the foundation for the next analysis of the fatigue life of the gear.(4)Taking the new gear structure as the object,under the same working condition,the bending strength and bending fatigue life of the new gear structure are analyzed by the method of residual compressive stress and the non-residual compressive stress.Through the comparative analysis,we found that the residual compressive stress can greatly improve the bending resistance and fatigue resistance of the gear.