Abstract: Aiming at the problem that the flexspline bears alternating loads and periodic deformation during the transmission process of the harmonic gear transmission mechanism, the stress distribution under the assembly of the flexspline was analyzed. The "rigid-flexible" surface contact between the wave generator and the flexible wheel was defined under the action of the cam wave generator assembly based on ANSYS finite element software. The control variable method was used to change the structural parameters of the flexspline, the deformation and stress distribution of the flexspline under no-load, and the influence of different geometrical structure parameters on the stress changes in various parts of the flexspline were explored. The stress variations of the flexspline under no-load and load with constant parameters were also analyzed. The results show that after the flexspline is assembled with the wave generator, the deformation of the cylinder is mainly at the long axis of the wave generator; when the flexspline is unloaded, the distribution and magnitude of the stress are mainly related to the wave generator, and the stress magnitude is also affected by the aspect ratio, tooth width and cylinder thickness. The flexure stress increases gradually wilth the increase of load.

Key words:  involute flexible wheel; harmonic reducer; finite element analysis; assembly stress distribution; ANSYS