The gearbox, a set of transmission devices used to coordinate the engine speed and the actual driving speed of the car, allows the car to produce different transmission ratios between the engine and the wheels during the driving process to play the best performance of the engine.
In simple terms, the engine is like a cow that only exerts power, and the gearbox is the reins, controlling the force of the engine, making it forward, backward, accelerating, and decelerating.
So what are the common types of gearboxes?
MT, manual gearbox.
The manual transmission is the earliest gearbox, characterized by simple structure, stable and durable, high efficiency, fuel saving and low cost. However, with the progress of car manufacturing level in recent years, as well as the cumbersome gear shift operation in the daily use process, it has gradually withdrawn from the market.
AMT gearbox, electronically controlled mechanical automatic gearbox.
The AMT transmission is an upgraded version of mt, on the basis of a manual transmission, the clutch used by the hydraulic mechanism to operate and the gear shift fork are added to replace the driver's hands and feet to achieve automatic shifting. Due to the advancement and iteration of technology, AMT, which has an overly prominent problem when changing gears, has gradually withdrawn from the market for family cars.
At transmission, hydraulic automatic transmission.
AT is what people often call automatic transmission. AT can be distinguished by different forward gears. For example, the common 6AT refers to having 6 forward gears, while 8AT refers to 8 forward gears.
It automatically shifts the speed depending on the degree of pedaling on the accelerator pedal and the change in speed. Let the driver just operate the accelerator pedal to control the speed. However, due to the automation of machinery, the corresponding speed is slower than MT, and the efficiency is not as high as MT, and it will cost some fuel.
CVT gearbox, mechanical stepless automatic transmission.
CVT is also called automatic stepless transmission, it is characterized by the acceleration curve when changing speed is a continuous line, rather than an acceleration node, so there is no frustration, driving smoothness is great, and small size and simple structure cost is lower than AT. But because the CVT transmits power through friction and therefore cannot withstand a large torque, the driving power will feel more "meaty".
DCT, dual clutch transmission.
As the name suggests, the DCT transmission houses two sets of clutches. Dual-clutch can be divided into dry dual-clutch and wet dual-clutch according to the different connecting media of the active disc and the driven disc.
The characteristic of dry double clutch is that due to the same rigid connection as the single clutch, the transmission efficiency is very high, but when encountering traffic jams and other environments, the vehicle frequent starts, and in the case of lifting gear, due to the repeated connection friction of the clutch, and there is no effective heat dissipation, it is easy to cause the clutch plate to overheat, thereby shortening the life of the clutch plate.
The wet double clutch is soaked in the transmission oil to help dissipate heat, and the heat dissipation is much better than the dry double clutch, and the life is naturally long. However, the same is due to the immersion in the oil, the transmission efficiency is lower than that of the dry double clutch.
Compared to AT and CVT, DCT transmissions are much younger. DCT is characterized by direct response, and quick shifting, the entire shift is clean and clean, the smoothness is also better than the single clutch MT and the efficiency is also very high, fuel saving. With the development of automobiles, dual clutches are increasingly appearing on the market.
To sum up, if you want to experience pure driving pleasure, you can choose MT, and DCT, CVT, AT are all common gearboxes on the market today, each with advantages and disadvantages. If so, how would you choose? Welcome to leave a message to express your opinion.