Abstract: To meet the demand of higher indexing frequency from the field of high-speed automatic machines, an approach to dynamic modeling and optimization design of a novel eccentric indexing mechanism with the coaxial input/output arrangement is investigated. Compared with the existing indexing cam mechanisms, the new one is more compact in structure, and enables to produce higher indexing frequency at the same input speed. By taking the mechanism as the research object, its elastodynamic model is studied by taking the transverse and torsional vibrations of the input and output shafts into account, and then the dynamic optimization is carried out by means of the sensitivity analysis. Based on these, the effectiveness of the approach is validated by the dynamic simulations. The research lays an important theoretical foundation for developing the engineering prototype of this novel indexing mechanism.

Key words: Dynamics, Indexing mechanism, Modeling, Optimization