Research On Profile Modification Of Cycloidal Gear Used In RV Reducer

As the core component of the RV reducer,the shape of the cycloidal gear has a direct influence on the transmission performance of the RV reducer,so it is of great significance to study the profile modification of the cycloidal gear used in RV reducer.In view of the current common profile modification of cycloidal gear can not meet the requirements of high transmission accuracy and high bearing capacity of the RV reducer,this paper,based on the analysis of the meshing principle of the RV reducer,puts forward a method of profile modification based on the homogenization of contact stress.The main research work is as follows:(1)The important parameters such as the forming mechanism of the cycloidal gear profile,the curvature of the profile and the pressure angle of the cycloid-pin wheel are studied,and the relationship between the curvature of the cycloid profile and the change of the basic parameters of the cycloidal gear profile is analyzed,and the three-dimensional motion model of the RV reducer is established.Kinematics simulation is carried out to verify the correctness of the proposed model.(2)A gear profile modification method based on contact stress homogenization is presented.In this method,the traditional optimization algorithm is improved by using the algorithm as the input condition,combined the force program of cycloid needle wheel drive,the minimum variance of contact stress distribution between the teeth of the common meshing as the optimization condition,and obtaining the optimal equidistance and shift distance repair quantity.The example shows that the modification method can not only meet the high precision transmission requirements of the RV reducer but also ensure the good tooth surface force of the cycloid-pin wheel drive.(3)The contact finite element model of cycloid-pin wheel drive is established.By solving the model,the stress and displacement state of cycloid wheel and needle wheel in actual working state are obtained.The calculation results of contact stress Hertz of the cycloid needle wheel are compared with the result of finite element calculation,and the reliability of the finite element solution is verified and the proposed method is put forward.The modification method is effective in improving the meshing state of the cycloid pin gear.(4)The comprehensive performance test of RV reducer was carried out.A CNC gear grinding machine is used to modify the cycloidal gear in RV-20 E,and the important performance parameters of the prototype are detected by the RV retarder comprehensive performance test bench.The results show that the overall performance of the prototype has reached a high precision on the whole,thus proving that the proposed modification method can meet the high precision transmission requirements of the RV reducer.