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The manual gearbox is mainly composed of gears and shafts, and generates variable-speed torque through different gear combinations. The automatic agricultural gearbox is composed of hydraulic torque converter, planetary gears and hydraulic control system, and is transmitted through hydraulic transmission and gear combination. Achieve variable speed torque.
The manual transmission hydraulic torque converter is the most characteristic component. It consists of the pump wheel, turbine and guide wheel and other components, and directly inputs the engine power transmission torque and cooperation. The pump wheel and the turbine are a pair of working combinations. They are like two fans placed opposite each other. The wind power blown by one active fan will drive the blades of another passive fan to rotate. The flowing air—wind power becomes the medium for kinetic energy transmission. . If liquid is used instead of air as a medium to transfer kinetic energy, the pump wheel will drive the turbine through the liquid, and then the guide wheel will be added between the pump wheel and the turbine to increase the liquid transfer efficiency. Due to the torque converter's automatic transmission torque change range is not enough and the efficiency is low.