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Functions of the transmission: 1. Change the transmission ratio to meet the traction requirements of different driving conditions; 2. To realize reverse driving, which is used to meet the needs of vehicle reverse driving; 3. Interruption of power transmission: when the engine starts, idles, the vehicle shifts gears or needs to stop for power output, the power transmission to the driving wheels is interrupted; 4. Neutral is achieved. When the clutch is engaged, the transmission may not output power. Function and composition classification of transmission 1、 Functions of transmission: (1) Change the transmission ratio: expand the variation range of the torque and speed of the driving wheel to adapt to the frequently changing driving conditions, such as starting, accelerating and uphill, so that the engine can work under favorable working conditions. (2) Under the premise that the rotation direction of the engine is unchanged, the vehicle can travel backwards. (3) . use neutral to interrupt power transmission, so that the engine can start and idle, and facilitate gear shifting or power output of the transmission. 2、 Composition of transmission: variable speed transmission mechanism and control mechanism the transmission is composed of transmission mechanism and transmission mechanism, which can be made into a separate transmission mechanism or assembled in the same housing with the transmission mechanism. Most of the transmission mechanisms are driven by ordinary gears, and some are driven by planetary gears. Ordinary gear transmission transmission mechanisms generally use sliding gears and clutches. Sliding gear can be divided into multiple sliding gear and displacement sliding gear. Adopt triple sliding gear to change speed, with large axial size; The structure is compact, but the change of transmission ratio is small. There are meshing and friction clutches. When the engaged clutch is used, the speed change shall be carried out when the vehicle stops or the speed difference is very small. When the friction clutch is used, the speed change can be carried out at any speed difference during operation, but the bearing capacity is small, and the strict synchronization of the two shafts cannot be guaranteed. In order to overcome this disadvantage, friction plates are installed on the engaged clutch. When shifting, the driven wheel is brought to the synchronous speed by the friction plates and then engaged. Planetary gear transmission can be controlled by brake. 3、 Classification of transmission: (1) According to the mode of transmission ratio change: stepless, stepless and comprehensive 1. Stepped transmission: stepped transmission is most widely used. It adopts gear transmission and has several fixed transmission ratios. a. According to the different gear trains used, there are two types of axial fixed (ordinary gear transmission) and axial rotary (planetary gear transmission). b. At present, the transmission ratio of cars, light and medium trucks usually has 3-5 forward gears and one reverse gear. c. The combined transmission is used in heavy-duty vehicles, which adopts more gears and is generally composed of two transmissions. 2. Stepless type: the transmission ratio of a stepless transmission can be changed in infinite stages within a certain range.