Stress Analysis of Cup Type Strain Wave Gearing

Abstract

The main purpose of this study is the numerical evaluation of the stress state in the Flexspline which is the key element in the Strain Wave Gearing. When the Flexspline is deformed into an elliptical shape by repeated load from the Wave generator, the fatigue of Flexspline at the root of the gear becomes a serious problem. The Cup Type Strain Wave Gearing is modelled using brick element, beam element and joint element in the three dimensional field. Based on the three dimensional FEM analysis, the hoop stress at the root of the gear in the Flexspline is evaluated. The effect of the torque, the position of Bearing ball and the contact between Flexspline and the outer ring of Bearing on the stress states are studied. © 1998, The Japan Society of Mechanical Engineers. All rights reserved.