Abstract
The failure of harmonic gear drive is mainly caused by the fatigue fracture of flexible wheels and the fatigue damage of flexible bearings. In this paper, the stress sensitivity and fatigue life characteristics of flexible wheels with thin-walled vulnerable components are studied. Firstly, the structure of the flexible wheel of a B3-80 general harmonic gear reducer is designed, the finite element model of the flexible wheel is established by using ANSYS finite element software, and the finite element analysis results are compared with the theoretical calculations to verify the correctness of the model. Finally, by changing the cylinder length, smooth cylinder wall thickness and load, the maximum equivalent stress curves of the flexible gear ring, smooth cylinder and flexible wheel bottom are obtained, and the influence law of structural parameters on the stress characteristics of flexible wheel is obtained. At the same time, the influence laws of flexible wheel cylinder length and smooth cylinder wall thickness on the fatigue life of flexible wheel is studied, which provides a theoretical basis for the structural optimization design of the cup flexible wheel.
Highlights
Harmonic gear drive is widely used in industrial robots, aerospace and optics and other fields, and has the ability to work normally in vacuum, strong radiation and large temperature difference environments
The failure of harmonic gear transmission is mainly caused by the fatigue fracture of the flexspline and the fatigue damage of flexible bearings [1]
According to the research on harmonic gear reducer geometric parameters on flexural stress sensitivity and fatigue life of the law of the study, harmonic drive is based on the thin wall shell elastic deformation theory on the basis of a new transmission mode, and harmonic gear reducer research is usually conducted with the help of finite element software
Summary
Harmonic gear drive is widely used in industrial robots, aerospace and optics and other fields, and has the ability to work normally in vacuum, strong radiation and large temperature difference environments. Dennis et al [4] estimated the contact stress and bending stress of flexible gear teeth through the combination of nonlinear dynamic simulation and finite element analysis, and determined the influence of flexible gear tooth shape change on harmonic transmission performance. Leno et al [11] determined the influence of the geometric structure change of flexible gear teeth on the performance of a double wave harmonic drive through statistical analysis to evaluate the motion error, load capacity, bending fatigue strength and pitting corrosion. According to the research on harmonic gear reducer geometric parameters on flexural stress sensitivity and fatigue life of the law of the study, harmonic drive is based on the thin wall shell elastic deformation theory on the basis of a new transmission mode, and harmonic gear reducer research is usually conducted with the help of finite element software.
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