Design And Transmission Characteristics Of SEJIN Reducer

Restricted by the level of science and technology, china imports most of high precision reducer.At present, the RV reducer is widely used in engineering field. In recent years, South Korea successfully developed SEJIN reducer. Its transmission principle is the same as RV reducer. But as for the internal meshing part,it use short involute gear to replace the cycloidal pin wheel. It has the advantages of convenient processing and superior performance,so the SEJIN reducer is a very promising new type involute gear reducer of small tooth difference.Based on the analysis of the transmission characteristics,the bearing capacity and the hysteresis of SEJIN reducer, the design of the reducer is carried out.The finite element simulation analysis of the key parts of the reducer is carried out to verify the correctness of the theoretical model.Through the in-depth analysis of the relationship and variation between the design parameters and meshing quality index of the involute internal gear pair with few teeth difference, the design parameters are optimized.Emphatically analyzes the changing tendency between meshing angle and the sliding rate, the coefficient of variation, the efficiency of engagement and the coefficient of engagement coefficient.The transmission scheme of SEJIN reducer is analyzed, and the calculation of gear matching is carried out.Through the analysis of the selection of the coefficient of variation, and based on the principle of minimum meshing angle, write Newton iterative program of the coefficient of variation by matlab. Calculate the transmission ratio and transmission efficiency of SEJIN reducer. The stress of the core components of the SEJIN reducer and the bearing of the multi tooth pair of the internal gear pair are analyzed and calculated theoreticallyThe strength of the gear pair is checked by the traditional strength theory, and the strength of the key parts is simulated and analyzed by using ANSYS finite element software. Including the bending strength of the gears, the contact analysis of the gear pair and the modal analysis of the key parts. The correctness of the theoretical model and the theoretical calculation is verified, and the phenomenon of the multi tooth engagement is confirmed. Through the simulation, the weak link of the force and deformation of the reducer is obtained, and the measures to improve the strength and vibration frequency of the reducer are proposed. Analyze the influence of meshing accuracy to simulation accuracy, and tooth thickness, fillet radius to the gear bearing capacity. Finally,select the appropriate bearing and determine the accuracy and heat treatment method of the parts are determined The 3D modeling and virtual prototype assembly of SEJIN reducer is carried out by Pro/E.In order to make the accuracy and tolerance of the parts reasonably, study the influence factors of the backlash of the SEJIN reducer, establishes a mathematical model and probability distribution formula of the error terms. Determine the effect of the error terms on the output shaft backlash through sensitivity analysis,and found the key error terms. Determine the accuracy and heat treatment of the components, and calculate the backlash of the whole machine. After many adjustments and checking, determine the accuracy and tolerance of the parts finally, so that t hysteresis on the output shaft floating about 60 arcsec.