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Automatic transmission is one of the most important equipments in automobile. The purpose of this work is to propose the a systematic methodology for the synthesis and analysis of the kinematic structure of transmission mechanisms. First, the functions and characteristics of transmission mechanism are clarified. The graph representation and adjacency matrix are used to present the kinematic structure of transmission mechanisms. Then, base on the graph representation, the structural code for mechanism is proposed to identify the isomorphism of transmission mechanism. Then, base on the fundamental circuits, the systematic procedure for the performance analysis of transmission mechanisms is proposed. A computer program is further developed for the automatic performance analysis. Next, a systematic methodology for the synthesis of planetary geared kinematic graph is proposed by using the acyclic graphs. The data base of Structural codes of one-DOF planetary geared kinematic chains up to nine links is listed. Finally, base on the characteristics of transmission mechanisms, the admissible planetary gear trains for transmission mechanism are generated from the data base of structural codes. And an atlas of admissible planetary gear trains up to seven links is listed. The result of this work is of benefit for the kinematic design of transmission mechanisms.
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