Design And Research Of RV-like Involute Variable Gear Reducer

China's production and manufacturing in the field of RV reducer has low accuracy,short life and small bearing capacity.Especially in terms of cycloidal pin wheels,due to many deficiencies in China's high-precision machine tools and other processing equipment and processing technology,there is a large gap between China and foreign countries in the modification of cycloidal pinwheels,which is difficult to process.Cycloid pin wheel with high precision.The cycloid pin wheel is the core part of the RV reducer,and it is also the most critical primary transmission in the two-stage transmission of the RV reducer.This directly leads to China's difficulty in achieving success in RV reducers,the international RV reducer market is basically monopolized by Japan and other countries.In view of the difficulties in the field of RV reducers in China,this paper proposes an RV-like involute gear reducer,which mainly deals with the mechanical structure,kinematics,dynamics,backlash,power flow and efficiency of the reducer.Analysis.It includes the following work:(1)The mechanical structure of the reducer is designed according to the requirements mentioned,using two-stage deceleration transmission,the first stage is a pseudo planetary gear reducer transmission,the three pseudo-planetary gears are evenly distributed at 120 °,and the second stage uses an involute Planetary gears reduce transmission,and two involute planetary gears are evenly distributed at 180 °.According to the input torque of the reducer,the modulus of the gear is calculated,the transmission ratio is assigned,and the basic parameters of each gear in the two-stage transmission are obtained.According to the two basic conditions in the involute less tooth difference transmission,the displacement coefficients of the internal gear and the planetary gears are calculated specifically,the specific calculation method of the displacement coefficient of the meshing gear is studied,and the complete calculation of the displacement coefficient is given process.Secondly,the key components of the reducer such as crankshaft,spline and bearing are designed and checked.Finally,a three-dimensional model of the reducer is established.(2)With the help of ADAMS,the correctness of the motion relationship of the reducer is simply verified,and the dynamics problem is mainly studied.Using the concentrated parameter method,the dynamic equations of the gears are considered,and the dynamic model of the machine is given.The relative displacement,rotation angle and transmission error of each member are analyzed.In order to improve the accuracy of the model,the improved Ishikawa time-varying meshing stiffness calculation formula is adopted for the gear meshing stiffness,and the time-varying stiffness is analyzed from a theoretical level.The ANSYS Workbench was used to simulate and analyze the strain curve of a pair of gears during meshing,and then converted it into a stiffness curve and compared it with the theoretical analysis curve.Then use ADAMS to simulate the dynamic performance of the reducer such as displacement and meshing force.Finally,the meshing force of the gear teeth is analyzed and calculated and compared with the simulation.(3)Analyze the relationship between the backlash of the gear tooth and the backlash caused by it,find each backlash source that causes the backlash of the reducer,calculate the backlash generated by each backlash source,and finally carry out Comprehensively,the overall return difference of the reducer is obtained.(4)According to the principle of balance of force and torque of each component,analyze the stress problem of each component in the reducer.According to the spatial structure of the reducer,it is concluded that it is a power split type,and it is simplified to an XP type single loop system.According to the general method of single-loop XP system analysis,the flow of power in the reducer is analyzed.The transmission efficiency of the reducer is analyzed using the principle that the node power can be superimposed,and the transmission efficiency of the designed reducer is taken as an example.