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In the teaching of hydraulic mechanical automatic transmission, the lever method and reduced graph method are used respectively for the teaching of planetary mechanism shift schedule and hydraulic control circuit which are difficult for students to grasp. The lever method is used to develop the tachogram of planetary gears, and the transmission ratio of Simpson and Ravigneaux planetary gears is analyzed. The hydraulic transmission basic circuit analysis method is used in the simplification of hydraulic control circuit of hydraulic mechanical automatic transmission, aiming to solve students’ difficulty in the understanding of automatic transmission. It turns out that students master this part very well. Keywords—automatic transmission; planetary gear mechanism; teaching method; discussion

Discussion on Teaching Method of the Hydraulic Mechanical Automatic Transmission