Why should those who say such things be punished?

This starts from the basic structure of the automatic transmission, just from the automatic transmission itself, this thing is nothing more than two levels: software and hardware, the hardware level, including the material performance of parts, processing accuracy, assembly level, etc.; The software part includes the control software, which in turn includes the basic software of the system itself and the special calibration of the gearbox made by the OEM in the later stage for the output characteristics of its own engine and the power effect it wants. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

The technical content of automatic transmission is indeed very high, it is a highly sophisticated mechanical system, and the requirements for materials, processing accuracy, and assembly process are very high, which is true, and now, this thing is almost a thing that cannot be industrialized and mass-produced for the Republic, but after more than 20 years, it is not the same thing, is it not the same thing that China produces excellent torque converters, excellent hydraulic systems, excellent software and various computer logic algorithms?

The basic technology of the automatic transmission of the republic has been basically able to meet the needs of the market, the difference is nothing more than the adjustment of the software, the calibration of the shift logic, these things need to be very rich in big data resources to do the support to be able to do very well, if there is not enough big data to support, although the automatic transmission can also operate normally, but the shift logic is stupid, the frustration is serious and even the understanding of the wrong driver's shift intention is likely to occur.

Another reason is the cost factor, such as ZF, Aisin Seiki and other automatic transmission giants, the annual production of automatic transmission products up to millions, tens of millions of units, greatly diluted R & D costs, manufacturing costs, management costs and labor costs, domestic automatic transmission enterprises, a year to produce so tens of thousands, hundreds of thousands of units, the direct consequence is that the cost of a single gearbox remains high, coupled with the foreign giants deliberately in the core components of the restrictions, the cost is not high, that is the hell.

Civilian things are different from military ones, military equipment involves an international national defense and strategic security, as long as we can produce it, poor performance is not a problem, other people's tank engines are 5,000 hours of continuous operation without overhaul, our own can only do 3,000 hours of continuous operation without overhaul, and even the cost is higher, but we would rather use our own engines with high prices and low performance than other people's engines -- once a war breaks out, It's not fun to be stuck in the neck by others, and as for the performance of my engine lagging behind, I slowly improved it.

But civilian products do not work, this thing is to be sold on the market for money, for customers, other people's automatic transmissions only need 20,000 units, why do you sell 30,000? Don't tell me anything about R&D costs or anything like that, I don't listen, I know that I buy your engine, and I will have to pay more than 10,000 oceans for each engine, if I purchase 10,000 units from you every year, doesn't it mean that I will give you an extra 100 million every year? That's definitely not going to work! What can I do with this 100 million? Xiaomi, who raises Xiaomi, can at least row from the East Third Ring Road to the West Third Ring Road.

It is precisely because of this that Chen Gengcai particularly admires the few domestic companies that insist on independent automatic transmission, whether it is Chery's own CVT continuously variable transmission, or BYD's dual clutch, especially BYD, although limited to the lack of development experience and many other problems, their dual clutch still has a lot of problems, but they are really admirable people, they are much stronger than those who only know how to stand on the stage and put their mouths (unconsciously complain so much).

"What is the maximum torque that we can find now?" Chen Geng frowned and asked.

Comrade Lao Pa consciously ignored the aero engine blade material found by Chen Geng, and sighed deeply: "Only 92 Nm." ”

"Tsk......" Chen Geng grinned: "It's still better than last time." ”

"Yes, it has progressed, from 87 Nm to 92 Nm," Comrade Lao Pa looked at Chen Geng angrily: "Removing the insurance margin, this torque converter can withstand 80 Nm of input torque, so it can only be used by our Beidou - can a family minicar like the Beidou use an automatic transmission?" ”

That's right!

Do micro family cars use automatic transmissions? Not to mention this kind of small car positioned in the A0 class, even if it is a standard mid-level car of this era like the Passat, doesn't the manual transmission also account for more than 99.9% of sales? (The remaining 0.1% is equipped with a 3-speed automatic transmission)

Just as he was about to speak, a thought suddenly flashed in Chen Geng's heart, and he hurriedly asked: "Lao Pa, this hydraulic torque converter of ours is easy to transform into a hydraulic coupling." ”

"Of course, the basic structure of the two is exactly the same, it's just that there is one guide wheel missing," Comrade Lao Pa blinked, not understanding the meaning of Chen Geng's question: "But what's the use?" ”

"Make a CVT continuously variable transmission," Chen Geng said excitedly: "Even if the current technology and market are not mature, we can use it as a technical reserve first." ”

The structure of the hydraulic torque converter used on the AT gearbox is basically the same as that of the hydraulic coupling used on the CVT gearbox, the hydraulic torque converter is mainly composed of the shell, the pump wheel, the turbine and the guide wheel, and the hydraulic coupling is mainly composed of the shell, the pump wheel and the turbine.

Of course, the reason why CVT continuously variable transmission needs a fluid coupling that does not have torque change characteristics is because the working mode of CVT allows the steel belt to naturally have the function of torque conversion when changing between the taper pulleys, since it has the function of torque conversion inside, it naturally does not need a hydraulic torque converter with torque conversion function, and some CVT transmission manufacturers will even use clutches to replace fluid couplings on their low-end CVT products for the sake of cost control. (That's what Punch does, and the cars that cost tens of thousands of dollars in China and are equipped with CVT gearboxes are basically this CVT transmission)

It is still difficult to manufacture a torque converter if you have mastered the manufacturing technology of the hydraulic torque converter, but if you master the manufacturing technology of the hydraulic torque converter and turn your head to develop and manufacture the hydraulic coupling, it is really not difficult at all.

Lao Pa still didn't quite understand what Chen Geng meant: "You mean that we not only have to do AT, but also do CVT?" ”

"yes."

But what's the point of doing that? Isn't it just a matter of adding costs out of thin air? ”

"The cost of CVT is low, if necessary in the future, our low-end models can be equipped with lower-cost CVT to open up the grade with competitors, and we will carry AT for high-end models, so isn't it?"

"Is that okay?" Comrade Lao Pa said that I was very skeptical.

"Comrade Lao Pa, you don't understand this," Chen Geng, who knows the thinking habits of the Chinese people very well, patted Comrade Lao Pa on the shoulder and said: "For example, it is also a compact model, and other people's models are manual transmissions, we not only provide manual transmissions, but also automatic transmissions, what does this mean?" This shows that our technical level is higher, and over time, the added value of our brand will be higher than that of our opponents......"

"But what about the CVT's push belt?" Comrade Lao Pa was not fooled by Chen Geng, and asked: "There are only two companies in the world that can produce CVT push steel belts, and if you want to develop CVT, you can only buy steel belts from them. ”

"So I envisioned a new CVT steel belt method, come on, come on, I'll draw it for you," Chen Geng picked up a piece of paper and drew on it: "In this way, we don't need to push the steel sheet of the steel belt, but draw on the chain drive technology of the motorcycle to design a pulling CVT chain, which is like this...... What do you think? ”

With the actions of Chen Geng's subordinates, Comrade Lao Pa's eyes are getting brighter and brighter!

Awesome!

Compared with the push steel belt with high requirements for steel sheet material and processing technology package, this pull chain designed by Chen Geng not only increases the overall width a lot, but also can obviously withstand greater power and torque!

CVT is good, but limited to the physical characteristics of the push steel belt, a big problem with this kind of gearbox is that it can't withstand too high power and torque, but the limit of power and torque that this pull CVT chain can withstand is much higher.

After staring at it seriously for a long time, Comrade Lao Pa said affirmatively: "This chain has great potential, and it can definitely withstand the maximum torque of about 300 Nm!" ”

"300 Nm?" Chen Geng smiled: "My goal is to make a CVT that can withstand 400 Nm of torque!" ”

"That's amazing, but if the materials and craftsmanship can keep up, it's not impossible," Comrade Lao Pa suddenly raised his head and looked at Chen Geng with blazing eyes: "Chen, do you plan to focus on CVT in the future?" ”

"CVT and AT are equally important," Chen Geng did not hide from him, explaining: "The characteristic of CVT is smoothness, but some models do not need to be smooth, so ......"

"I understand, I'll take care of the other problems, so now, how do you solve the problem of the torque converter?"

Solving the problem of the torque converter is equivalent to solving the problem of the hydraulic coupling used in this CVT transmission, and these two problems are actually one problem.

Regarding this question, Chen Geng also seriously considered it just now: "I am going to go to the Soviet Union to have a look. ”

"The Soviet Union?" Comrade Lao Pa exclaimed. (To be continued.) )