CVT is fuel-efficient, stable and good, but you can use it if you want. The same is true of AT next door. Domestic cars have no choice but to eat the "cold dish" of dual clutch.
It's like: hairy crabs are delicious, but you can't afford them with so little money in your pocket. Eating vegetables and noodles is also ok, both of which can be satisfied.
Can domestic car companies really make CVT?
CVT technology content is not high.
First of all, it must be clear that domestic car companies are not incapable of building CVT, and the technical content of CVT is not as high as expected.
Wang Zheyue published a paper "Research on Structure Principle and Main Faults of Automobile CVT Gearbox" in China Machinery magazine, which said.
The overall structure of CVT gearbox is relatively simple, with fewer parts, and the manufacturing cost is lower than that of ordinary automatic gearbox.
To put it simply: we can build airplanes, cannons, high-speed trains and atomic bombs, but a CVT is not a problem, it is a question of whether or not.
Some companies make CVT.
Moreover, in fact, there are already companies that make domestic CVT.
At the 20 19 Shanghai Auto Show, Wan Liyang launched its own CVT25 gearbox, which is now installed on some domestic brands, such as Chery and Geely.
This CVT gearbox also won the 4th World Top Ten Transmission Award sponsored by the Automobile Evaluation Research Institute.
You can build it. Why not?
Although it can be built, why are few people building it? Or use CVT?
Can't get around the patent issue
The key problem is that the technical patents of CVT core components have been mastered by foreign companies for a long time, mainly Bosch and Schaeffler.
At present, CVT drives are basically steel belts. If you want to use it, you have to pay royalties, so the cost is not easy to control.
It's like: Apple and Xiaomi have to pay Qualcomm, right?
Wan Liyang CVT, as mentioned just now, actually cooperates with Bosch to use Bosch steel belt.
If you want to bypass the patent, there is no way to develop CVT gearbox.
For example, this restaurant has a unique secret recipe, Chili powder, which is delicious if others can't make that taste. If you want to open this restaurant, you can't do without Chili powder, so you have no choice but to pay the franchise fee.
If you open it yourself, because of the spicy powder, it is not spicy enough, or it is not fragrant enough, so people don't need it. "er" people ... are easy to lose business and trouble anyway. That's pretty much what it feels like.
CVT is not as good as expected.
Moreover, although CVT is fuel-efficient and stable, it is not without its shortcomings.
We have done a special video "Why CVT is the Weak Chicken in the Gearbox" before, which said that CVT can't bear a relatively large torque because it uses steel belt transmission.
The most advanced CVT on the market can only bear 500n·m basically, not to mention ordinary CVT. For example, the CVT25 in Wan Liyang can only bear 250n·m at most.
At the same time, CVT is also prone to problems such as overheating of gearbox and fracture of steel belt.
Therefore, CVT is a bit like a partial student, and it is quite good in fuel saving and stability, but the results in other subjects are not very good, and the total score is not much higher. Naturally, it doesn't need to spend a lot of money to develop.
Why are they all using dual clutches?
Dual clutch does not have many patent problems.
On the other hand, if you look at the dual clutch, there are actually not so many restrictions.
Wang Feng and Zhou Yunlong published a paper entitled "Structural Principle and Domestic Development Prospect of powershift" in the journal Modern Industrial Economy and Informatization, which said.
The structure of dual clutch is similar to that of manual gearbox, and few patented technologies are involved. Domestic enterprises can greatly reduce the royalties, so the cost will come down.
As for AT and CVT, according to the survey in China National Intellectual Property Administration, the number of AT and CVT patent applications filed by foreign automatic transmission manufacturers exceeds 1 1000.
Therefore, domestic cars are so "like" to use dual clutches, which is actually a bit helpless.
It is simple in construction and low in cost.
In addition, the dual clutch is simple to manufacture and low in cost.
Still refer to the previous paper: the cost of a complete AT or CVT gearbox is about 1.5 thousand to 30 thousand yuan. The matching cost of dual clutch is only 8000 to 1 000.
"Hey" is not a big deal, is it 20,000 to 30,000? After all, after selling millions of cars, the door handle is 50 yuan short, and 654.38+00,000 times 50 is a lot of money, not to mention 654.38+03,000, right?
Car companies have to make money after all, right? Well, we need to develop rapidly, cooperate with the current engine, control the cost and be more competitive, so the dual clutch will naturally be used more.
Support national policies
One last thing. In fact, creating a dual clutch is also supported by national policies, and friends may not know it.
In 2007, the country has included the research and development of dual-clutch gearbox in the key project of "863" science and technology plan in the Eleventh Five-Year Plan.
In 2008, Zhongfalian Investment Co., Ltd. was established at a cost of about 200 million US dollars to jointly develop dual clutches with 12 car companies.
It's like: the school took the initiative to open a remedial class, and everyone didn't have to pay. Here's the thing.
Dual clutch is a more suitable choice for China's national conditions
So generally speaking, domestic cars don't use CVT, which doesn't mean that domestic cars hate it or don't want to use it.
On the contrary, these restrictions on patents and costs make people reluctant to use them.
The dual clutch does not have so many patent restrictions, it is simple to make, and then the state strongly supports it. As a project, it is also a more suitable choice for the national conditions, and everyone follows suit.