Jixie chuandong (Aug 2021)
Spatial Tooth Profile Design and Optimization Analysis of Involute Harmonic Gear
Abstract
In order to improve the meshing performance of the involute tooth profile harmonic gear， the conjugate tooth profile discrete points in design section are obtained with an exact conjugate algorithm using assembly deformation of the flexspline，and the involute tooth profile of circular spline is obtained by fitting the conjugate tooth profile discrete points based on the involute features. Considering the influence of flexspline taper deformation， clearance optimal control model is established to optimize the modification coefficient of the flexspline section with different radial displacement， choose reasonable modification coefficient for part of the flexspline section on the basis of reducing tooth profile high. The harmonic gear with involute tooth profile that meets the requirements of spatial meshing is designed， and the design result is verified by the movement simulation analysis. The results show that， compared with the design section，the section with the maximum radial displacement increasing can avoid interference by reducing the modification coefficient，and the section with the maximum radial displacement decreasing can obtain good meshing performance by increasing the modification coefficient. In order to obtain good meshing performance， it is necessary to reduce the tooth height and reasonably change the modification coefficient of the flexspline when the maximum radial displacement decreases greatly and the interference occurs at the back section of the flexspline. Compared with the plane tooth profile， the designed spatial tooth profile can increase the engagement range and tooth profile contact area，and greatly improve the transmission performance.
