COMPUTERIZED DESIGN OF CYCLOIDAL GEAR DRIVE WITH IMPROVED GEAR TOOTH MODIFICATION

摘要

Precision cycloidal gearings are widely used in almost any industry applications such as industry robots and machine tools. To get a smooth transmission and eliminate backlash, some correct tooth form modifications are necessary. The conventional cycloidal tooth form is generated by a circular shaped grinding wheel and the tooth form modifications are (1) equidistant modification in which we use a little bigger circular arc than the diameter of the engaged pin; (2) rotate angle modification and (3) center distance modification. In a real gear drive, these three kinds of modification may use for a single cycloidal gear. However, such modifications are hard to control to get a smooth operation and assure stable contact pattern. This paper presents a new cycloidal gearing tooth form in which we use an elliptic grinding wheel to generate the cycloidal wheel. An analytical and computer-aided analysis and synthesis of cycloidal drive is put forward. The kinematics relationship is analytically defined, and subsequently analyzed in detail via a computer-aided procedure and FEA program. The results show a promising new gear tooth form may be used for quality production with high precision.