| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 104 === The design theories of parallel-connected epicyclic gear mechanism have been researched for a long time; however, the difficulty of connecting the coaxial links in gear mechanism with multiple fundamental gear entities and connecting clutch elements is a problem to be solved. Furthermore, it’s common to see the transmission with double-pinion fundamental gear entities in patents such as Ravigneaux mechanism, but lack of related design theories. Therefore, the purpose of this research is to present an efficient methodology for the systematic design of the parallel-connected automatic transmission for automobiles. First, fundamentals and gear-shifting operations of the parallel-connected automatic transmission are illustrated to establish the design requirements, the properties of epicyclic gear mechanism are summarized and the boundary-walk based on graph theory are generated. Then we determine the feasibility of coupling and connecting clutch elements of an epicyclic gear mechanism with the boundary-walk. With the above methods, designs of six-speed and eight-speed parallel-connected automatic transmission with double-pinion fundamental gear entities can be systematically synthesized from the given speed ratios. This proposed design method can also be applied to the design of multi-speed parallel-connected automatic transmissions. Second, on the basis of graphic design methodology, transmissions with double-pinion fundamental gear entities are involved in the systematic design methodology. Finally the computer algorithm of these methods are established.
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