Design Optimization Of A New Precision Cycloidal Reducer With Small Speed Ratio

This research is mainly aimed at the current situation that the product types of precision cycloidal reducers with small speed ratio can’t meet a large number of market demands,and a forward design of this type of reducer is carried out.The specific research contents are as follows:(1)Based on the analysis of the influence of different factors on the movement parameters of precision cycloidal reducer,combined with the design process of general RV reducer and traditional cycloidal pin wheel reducer,the basic parameters,such as transmission ratio,number of teeth at all levels,short amplitude coefficient,eccentricity,center circle radius of pin teeth,cycloidal wheel width,pin tooth radius and center circle radius of pin hole,are designed and calculated,and the type of rotary arm bearing is determined;(2)The meshing efficiency and anti-gluing ability of reducer after pressure angle modification are calculated and deduced,and a program is developed to calculate the meshing efficiency and anti-gluing ability of reducer after pressure angle modification,the maximum contact stress between cycloidal gear and pin teeth,and the number of teeth engaged at the same time.Based on the basic theoretical calculation of pressure angle modification,an optimized mathematical model is established,which includes seven design variables,namely,the maximum pressure angle of tooth root,the maximum pressure angle of tooth top,the radius of distribution circle of needle teeth,the short amplitude coefficient,the width of cycloidal gear,the number of cycloidal gear teeth,two objective functions of maximum meshing efficiency and the strongest anti-gluing ability,the range of short amplitude coefficient and the range of needle diameter coefficient,etc.The maximum meshing efficiency and anti-gluing ability are obtained by solving with genetic algorithm.(3)Based on the double-objective optimized design parameters,the three-dimensional equivalent entity model of each part of the reducer was built and virtual assembly was carried out.After format conversion,the whole model was imported into Recur Dyn software for dynamic analysis,and the actual working state of the whole machine at the rated input speed was simulated.The transmission ratio,stress and meshing efficiency under simulation analysis were obtained and compared with the theoretical design values,and then the methods and suggestions for improving the dynamic performance of the whole machine were put forward.(4)The finite element statics analysis of the whole machine model is carried out in the finite element analysis software,and the simulation results of stress state and equivalent contact stress of the main parts are obtained.The overall reliability of the reducer is further verified by comparative analysis.