The manual gearbox mainly consists of gears and shafts, which produces variable speed torque through different gear combinations. The automatic gearbox AT is composed of hydraulic torque converter, planetary gear and hydraulic control system. Through hydraulic transmission and gear combination To achieve variable speed torque.
Which torque converter is AT most characteristic parts, which consists of pump wheel, turbine and guide wheel and other components, direct input of engine power transmission torque and clutch. Pumps and turbines are a pair of work packages that act like two fans placed opposite one another. The wind from one active fan rotates the blades of another passive fan, and the flowing air-wind power becomes the medium of kinetic energy transfer .
If the liquid instead of air as the transfer of kinetic energy of the medium, the impeller will be driven by the liquid turbine rotation, and then between the impeller and the impeller to increase the efficiency of liquid transfer. As the hydraulic torque converter automatic transmission torque range is not big enough and the efficiency is low.