If it is purely from the perspective of life, the manual transmission is undoubtedly reliable. Even if it is damaged, its maintenance cost is much lower than that of the automatic transmission. However, there are fewer and fewer people in manual transmission models. According to statistics, the market In the proportion of new cars sold, the proportion of manual transmission is already less than 20%. You must know that around 2005, the proportion of manual transmission was as high as 80%. In the increasingly congested traffic environment in China, manual transmission models will become increasingly marginalized.
If we turn our attention to automatic transmission, three automatic transmissions of AT, DCT and CVT, which transmission has the longest life? How to choose?
CVT gearbox: the smoothest gearbox
Advantages: smooth shifting, simple structure, small size, low cost
Disadvantages: lack of driving pleasure, low torque capacity
CVT gearbox is currently the preferred automatic for entry-level family cars Gearbox, because it is really suitable for home use, smoothness is the biggest feature of CVT gearboxes. Although there are also some models of CVT gearboxes that have low-speed frustration due to matching problems with the engine, most CVT gearboxes can drive It is relatively smooth, because the CVT uses the diameter of the two cone discs to change gears and transmits power through the steel belt, so there is no sense of shifting paragraphs.
However, because the CVT gearbox uses steel belt or steel chain transmission, the maximum torque that can withstand is low, and the wear resistance of the steel belt is very high. The design life of the general CVT gearbox is 300,000 kilometers.
DCT gearbox: the most efficient gearbox
Advantages: direct transmission, high transmission efficiency, fast shifting speed, strong driving pleasure
Disadvantages: poor low-speed smoothness, poor quality stability, lower maximum torque capacity
double The clutch gearbox initially gave a poor impression, because the dual-clutch gearbox has no hydraulic torque converter. It controls the two sets of gears through two input shafts, and realizes the shifting operation through engagement and disconnection. Its structure Much simpler than AT gearbox. Therefore, it is a test of the tuning of car companies. At present, many dual-clutch gearboxes perform very well, such as the wet dual-clutch of Volkswagen, Hyundai, and Lynk & Co.
The main factor that affects the life of the dual-clutch is the manufacturer's adjustment. The dual-clutch clutch is more susceptible to high temperatures, so in theory, the dual-clutch clutch is more likely to be damaged. Under long-term congested road conditions, the life of the dual-clutch gearbox will be greatly shortened.
AT gearbox: the most balanced and stable gearbox
Advantages: smooth shifting, taking into account driving pleasure, maturity and stability, and large torque capacity
Disadvantages: low transmission efficiency, complex structure, the most difficult research and development, the highest cost
AT transmission The gearbox is still the most stable and reliable gearbox. This kind of gearbox is the earliest gearbox invented. It has a history of 100 years. Through the hydraulic torque converter, the torque of the AT gearbox is transmitted softly, greatly Increases the life of the gearbox. The AT gearbox is currently the most powerful gearbox with the strongest overall performance. It can not only achieve smooth shifting but also have a certain degree of driving pleasure. It can withstand larger torques, but the transmission efficiency is also low, and this This kind of gearbox has a high technical threshold and is difficult to develop. At the same time, the performance of AT gearboxes of various companies is also uneven. The performance of AT gearboxes of Aisin and ZF is relatively stable.
In terms of life, AT is better than CVT and DCT gearboxes. In terms of transmission efficiency and driving pleasure, DCT gearboxes are the strongest. In terms of ride comfort, CVT gearboxes are the best. In terms of shift speed, DCT The gearbox is the fastest, so these three gearboxes actually have their own advantages. Again, the one that suits you is the best.
This article comes from the author of Autohome and does not represent the viewpoint of Autohome.
