The tooth interference caused by the cup-shaped flexspline deformation is analyzed with the finite element method.Using UG software to build 3D models of the elliptical cam wave generator

the cup-shaped flexspline and the rigid gear

the models are imported to the ANSYS finite element software by Parasolid format and analyzed.The Node-Surface contact element to solve the contacting problem between the flexspline and the wave generator is put forward

so that the deformed flexspline is more approximate to the actual working conditions.Under no load condition

by taking the deformed cup-shaped flexspline as the object

the tooth interference caused by the radial displacement and the circumferential displacement is analyzed

and a method to observe the phenomenon of the tooth interference is proposed

and it provides a reference to the optimization for the harmonic drive.