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Essam L. Esmail 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
Many Lepelletier-type automatic transmissions are in production. Some of Lepelletier related configurations are still far from reachingmaximum possible sequential speed ratios. This work focuses on analyzing and developing twelve-link three-DOF Lepelletier-type automatictransmissions to attain maximum speed ratios. Following the general trend of increased shift stages and a wider range of speedratios, new ten-speed automatic transmissions are enumerated from the twelve-link three-DOF Lepelletier gear mechanisms. Furthermore,a ten-speed automatic transmission is modified from an existing eight-speed Lepelletier-type automatic transmission. The results showthat the twelve-link three-DOF Lepelletier gear mechanism could reach eleven forward speeds at most. Nomographs are shown to bepractical in detecting possible configurations and their clutching sequences.