In fact, it's not that our domestic enterprises don't want to build it, but that it really can't be built. At present, Wan Liyang is the only company in China that can independently develop and produce CVT gearboxes, while Wan Liyang's latest CVT? The model 25 gearbox can withstand a torque of 250 Nm, and its steel belt is also provided by Bosch. Why can't even such a powerful domestic CVT gearbox be built? In fact, only one country in the world can make steel belts for CVT gearboxes, and that is Germany. Japan, America, France and other countries can't. This is mainly due to the following reasons:
1, Patent Barriers and Cost Issues
Germany's automobile industry started earlier, accumulated rich technology and established patent barriers early. At present, the patent of transmission mechanism of CVT gearbox is in the hands of two German companies, among which Bosch is the main patent of steel belt and Schaeffler is the main patent of chain. Any enterprise that wants to produce steel strip or steel chain should either buy the patent authorization of these two enterprises, which is relatively expensive, or start from scratch by bypassing the technology, while domestic cars start late. If the steel belt of CVT gearbox is developed, the cost is very high, and the way of direct procurement is helpful to save the cost.
2, the technical difficulty is extremely high
Many people think that steel belts are just chains made of steel. Is it that hard? Let's look at the cross section of the steel strip. We can see that the steel belt is actually composed of many triangular steel sheets, and each steel sheet is coupled with the conical wheel of CVT gearbox to transmit power. The structure itself is not complicated, but the requirements for steel are extremely high. At present, the best quality steel enterprises in the world are in Japan, Europe and the United States, and the technical level of the five largest steel enterprises in Japan is 30 years ahead of the world. However, the domestic mainstream steel enterprises are mainly ordinary steel, and the special steel is Baosteel. For example, the blades of razors are also made by several foreign companies, which are sharper and more durable, while CVT gearboxes require higher durability, fatigue resistance and strength. Only a few steel enterprises in the world can produce.
To take a step back, even though domestic enterprises have made great efforts to conquer this technology, because Bosch and Schaeffler have been working hard in this market for a long time, ordinary car companies will not trust your products at all, so the result can only be thankless.
3. Different technical routes
If you look AT the gearbox usage of domestic cars, you will find that almost all domestic cars below 65438+ 10,000 yuan use CVT gearboxes, and most domestic cars above 65438+ 10,000 yuan use dual-clutch gearboxes, and then AT gearboxes will be used for higher-priced models. For domestic cars, CVT gearbox will only be used in low-end models, and dual-clutch gearbox is the focus of research and development of various car companies. This is because the dual clutch gearbox has a higher upper limit and higher transmission efficiency, which is more suitable for the strict domestic emission policy, while CVT gearbox is solved by purchasing suppliers' products.
Therefore, the reason why domestic enterprises don't produce CVT gearboxes is that they can't be made, which is extremely difficult technically. Although it is said that if the country really has the strength to tackle key problems, it will certainly be able to overcome this technical problem, it is actually unnecessary. The market share of CVT gearbox steel belt is so much that it is almost divided by two companies, and other companies have little market space. So don't worry that China can't get out of this or that, after all, the event of ballpoint pen core is still fresh in my mind.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.