GEOMETRY ANALYSIS AND OPTIMAL DESIGN OF GENEVA MECHANISMS WITH CURVED SLOTS

• Main Authors: Kou-Feng Huang, 黃國風
• Other Authors: Jyh-Jone Lee
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/49236565447441149513

碩士 === 國立臺灣大學 === 機械工程學研究所 === 91 === The disadvantage of using a conventional Geneva mechanism is the discontinuous acceleration at the initial and final stages when the crank pin engages and disengages with the wheel slot. Therefore, the objective of this paper is to synthesize the Geneva mechanism with curved slots that allows the wheel to run smoothly. Based on the theory of conjugate surfaces, mathematical expressions for the surface geometry are presented. In addition, to evaluate the combined kinematics and structural performance of the mechanism, the motor’s torque, the maximum contact stress and the degree of wear are established as the performance indices. Effects of variations in various design parameters on the values of the performance indices are investigated. Using the indices as the objective function, the optimum design is presented by SQP which is the solution technique for the constrained optimization problem. Lastly, the Bezier curve is adopted as the displacement curve for the wheel. Using the same process, the optimum slot curve can be obtained.