If you talk about a few good gearboxes, the first thing that comes to mind should be ZF 8AT, Aisin 8AT, Aisin 6AT, Mercedes-Benz 9AT, GM 10AT, etc. Few people first think of dual-clutch and CVT, from the overall performance In terms of performance, the AT gearbox is indeed better and more stable. In this case, independent brands with weak gearbox technology should focus on excellent gearboxes. But why are there more and more dual-clutch gearboxes in domestic cars?
Although AT gearboxes are good, they cannot be developed casually. Now the patents of core technologies are almost monopolized by some gearbox giants. Not to mention paying the patent fees according to their route, in the end, the core technology may still be in the hands of others. If you want to do your own research and development, you must bypass these patents. The difficulty will be greatly increased. After paying high research and development costs, you may not be able to successfully develop them. Therefore, it is normal not to research on AT gearboxes.
Furthermore, the CVT also has great shortcomings. Although the structure is not complicated, the adjustment of the transmission needs to be more precise. Unlike other gearboxes, there is no fixed gear, and it is not that a certain speed range corresponds to a certain gear. If you want to adjust The calibration needs to be accurate to each point of the corresponding relationship between speed and gear ratio, especially to test the level of adjustment. Moreover, the insufficient torsion resistance of the CVT gearbox will directly affect the matching with large-displacement engines. For example, the current 2.0T engine rarely matches the CVT, which will greatly limit the development of domestic cars to high-end.