Car transmission or gearbox? It turns out there are so many types and I have benefited a lot.

Functions and Types of Transmissions 1. Functions of Transmissions The piston engines widely used in automobiles have a very small range of output torque and speed. However, the complex road conditions and usage conditions encountered by the automobile when driving require the driving force of the automobile. and vehicle speed can vary within a considerable range. For this purpose, a transmission is provided in the vehicle's transmission system. The main functions of the transmission are: 1) Change the transmission ratio, change the driving speed of the car and the torque on the driving wheels of the car within a wide range to adapt to frequently changing driving conditions, and at the same time make the engine operate in a favorable manner (high power and consumption) Work under conditions with low oil rate). 2) On the premise that the rotation direction of the car engine remains unchanged, the reverse gear is used to realize the car driving in reverse. 3) Without the engine stalling, neutral gear is used to interrupt power transmission and facilitate vehicle starting, idling, shifting and power output. 2. Types of transmissions (1) According to the change of transmission ratio, transmissions can be divided into three types: stepped, stepless and comprehensive. 1) Stepped transmission. It has several transmission ratios with a certain value. The transmission ratio changes in a stepped or jumping manner. The stepped transmission is the most widely used. The transmission method adopts gear transmission (including ordinary gear transmission with fixed axis and planetary gear transmission with partial rotation of gear axis). . At present, the stepped transmissions used in cars and light and medium-sized trucks mostly have 3 to 6 forward gears and one reverse gear. 2) Continuously variable transmission. The transmission ratio of a continuously variable transmission can continuously change within a certain range of values. There are two types of continuously variable transmissions: electric and hydraulic. The transmission components are series DC motor and hydraulic torque converter. 3) Integrated transmission. The integrated transmission is a hydromechanical transmission composed of a hydraulic torque converter and a gear-type stepped transmission. Its transmission ratio can be continuously changed within several discontinuous ranges between the maximum value and the minimum value. There are many applications at present. (2) According to the operation mode, the transmission can be divided into three types: forced operation transmission, automatic operation transmission and semi-automatic operation transmission. 1) Forced transmission. The driver directly controls the gear lever to shift gears. 2) Automatic transmission. The transmission ratio selection and gear shifting are automatic. The driver only needs to operate the accelerator pedal, and the transmission can control the actuator according to the engine load signal and vehicle speed signal to realize the gear change. 3) Semi-automatic transmission. It is divided into two types: one is automatic shifting of partial gears and manual shifting of partial gears; the other is a pre-button selected gear, and the actuator automatically shifts when the clutch pedal is depressed or the accelerator pedal is released. block. Multi-axle driven cars are also equipped with a transfer case, through which the power can be transmitted to each drive axle.