The AT of car is more adopt planetary gear transmission
and has the development trend of 8shift
three rows of parallel planetary gear mechanism can realize 6forward shifts.The detailed analysis of the transmission scheme transmission scheme of hybrid-connected of 3-rows planetary gear mechanism is carried out based on lever method
ageneral regulation for 7
8
forward shifts of the transmission scheme is presented
the correctness of the analysis is proved through the examples.A theoretical reference for the development research of multiple speed transmission is provided.