(1) Change the transmission ratio and expand the range of driving wheel torque and speed to adapt to frequently changing driving conditions, while allowing the Petrol Car engine to work under favorable conditions (higher power and lower fuel consumption);
(3) Utilize neutral gear to interrupt power transmission so that the Roewe Car engine can start and change speed, and facilitate transmission shifting or power output.
(4) The transmission is composed of a speed change transmission mechanism and a control mechanism. If necessary, a power output can also be installed. There are two ways of classification: according to the transmission ratio change method and according to the different control methods.
The manual transmission is mainly composed of gears and shafts, and the speed and torque are generated through different gear combinations; while the automatic transmission AT is composed of a hydraulic torque converter, planetary gears and a hydraulic control system, and uses hydraulic transmission and gear combination. to achieve variable speed and torque.
Among them, the hydraulic torque converter is the most distinctive component of AT. It is composed of components such as a pump wheel, a turbine, and a guide wheel. It directly inputs the power of the Petrol Car engine to transmit torque and clutch action. The pump impeller and the turbine are a pair of working combinations. They are like two fans placed opposite each other. The wind blown by one active fan will drive the blades of the other passive fan to rotate. The flowing air-wind becomes the medium for transferring kinetic energy. .
If liquid is used instead of air as the medium for transmitting kinetic energy, the pump impeller will drive the turbine to rotate through the liquid, and a guide wheel is added between the pump impeller and the turbine to improve the transmission efficiency of the liquid. Because the hydraulic torque converter's automatic transmission torque range is not large enough and the efficiency is low.