Optimization And Research On Multi-objective Modification Of Cycloid Gear Tooth Profile Of RV Reduce

Due to its excellent performance,RV reducers are widely used in industrial robots,aerospace and other fields.Cycloidal gear is one of its core components,and its tooth profile performance is crucial to the load capacity,transmission accuracy and life of the reducer.In order to overcome the elastic deformation and thermal deformation during the meshing process of the cycloidal pin wheel,as well as manufacturing and processing errors,it is necessary to carry out shape modification and provide lubrication for the cycloidal pin wheel to increase the service life.At present,the single-objective modification research tends to sacrifice other aspects of performance while pursuing specific performance.However,in order to develop RV reducers suitable for industrial robots,multiple goals need to be considered at the same time,such as high load capacity and high transmission accuracy.Therefore,it is necessary to carry out multi-objective modification research.The multi-objective modification research has been carried out on the cycloidal wheel.The main research contents are as follows:(1)Introduced the structural characteristics of the RV reducer,studied the transmission principle and transmission characteristics of the two-stage reduction mechanism,analyzed the basic principles of the cycloidal wheel curve outer rolling method and inner rolling method,and the correct meshing transmission of the cycloidal wheel According to the necessary conditions,the standard tooth profile equation of the cycloidal gear profile is deduced,which lays the foundation for the modification of the cycloidal gear.(2)The basic method of how to modify the cycloidal wheel is analyzed,and the feasibility of the traditional combination modification method is discussed and analyzed.The contact stress model of the modified cycloidal pin wheel is established and iterative calculation is carried out.The analysis of the influence of shape modification on hysteresis is explored,and the gamultiobj algorithm after the improved NSGA-Ⅱ algorithm is used to optimize the solution,and the optimal amount of shape modification is obtained.(3)Using Solidworks 3D software to parametrically model the modified cycloid wheel,involute wheel,crank shaft and other reducer parts,after the assembly is completed,the motion interference detection is carried out,and no interference is found through motion analysis.Using the workbench platform,the finite element transient dynamic contact analysis of the second-stage cycloidal pinwheel mechanism is carried out,and the stress and strain of the cycloidal pinwheel mechanism and their distribution are explored.(4)The meshing modes of the modified cycloidal pinwheel under the constraint state are studied,and the resonance phenomenon is calculated by the meshing frequency formula,but these frequencies should be avoided during design and manufacture.The common processing method of cycloidal wheel is proposed,and the key process and difficulty of cycloidal wheel processing are studied,and the dynamic and static hysteresis detection test of RV reducer is designed for verification.