Abstract
The automatic transmission can automatically choose the gear according to the engine condition and the running speed of the car. In this paper, according to the structure characteristics of planetary gear mechanism, the different combination of shift actuators, get the movement rule and working principle of each gear position, calculated the specific parameters of each row of planetary gear mechanism. Next the article take Ravigneaux type of four gear automatic transmission for example, complete the design of automatic gearbox transmission mechanism, include various gear transmission route and the transmission scheme design, finally through the concrete parameters, finish the structure design of the whole planetary gear transmission part.
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