An assemblability check methodology for the kinematic configurations of automatic transmission planetary gear trains
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Automotive automatic transmissions typically use a planetary gear train to transmit power at a number of desired output-to-input speed ratios. This is achieved by connecting the gear sets forming the train in various ways as well as connecting certain members to the input and outputs shafts as well as friction elements to hold them stationary. As the gear train is coaxial, the connections between the members of the gear sets as well as input, output and fixed member connections must be planar (i.e. do not intersect) for the transmission to be assemblable. This paper proposes a methodology to perform such planarity (assembly) checks to examine if kinematic configurations of a given concept design for an automatic planetary gear train be mechanically assembled by using a vertex addition algorithm based on graph theory. The proposed methodology is demonstrated through selected planar and non-planar transmission examples.
KeywordsAssembly check Automotive transmission Planarity test Planetary gear train
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