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The variable-lead spiral pair mechanism is applied to the subway gate, which can improve the stability of the mechanical structure operation. This paper analyzes the variable lead spiral substructure. By the dynamics software, the motion characteristics of the lead spiral substructure is analyzed, and the finite element software is used to analyze the structural stress, contact stress and modal analysis. Through analysis, the rationality of the design of the variable lead spiral substructure is verified. The application of the variable lead spiral pair to the subway door system is very feasible. Keywords—variable-lead spiral pair; motion characteristics; contact stress; modal analysis

Research on Dynamics and Finite Element Simulation Analysis of Variable-lead Spiral Pair Substructure