"Planetary gears? Yang Group, this thing is quite troublesome to develop, and I don't know if this thing can be used in aero engines, this ultra-high torque, speed. It's a big test, we choose planetary gear transmission technology, is it a little too risky. ”

After listening to Yang Hui's explanation, Zhong Jianshe was still uncertain, after all, this thing had not been used in aero engines, so Zhong Jianshe raised this question in line with high safety and low risk.

In Zhong Jianjian's view, although the fixed shaft gear train used in the current TFE731 engine is more complex and troublesome to maintain, there are no problems in design and use, and manufacturing.

But what Zhong Jianshe didn't know was that in the second improvement of TFE731, Garrett actually abandoned the fixed-shaft gear transmission system, and also designed the gearbox from scratch, using planetary gears.

Moreover, even Yang Hui did not know this, and even the current Garrett company has not improved the gearbox of TFE731, and the fixed shaft gear used in the initial design is still being used in 85 years.

In other words, Yang Hui spent the wrong eight million dollars, and when he bought it, he bought an early gearbox version of the TFE731 engine, that is, a version with fixed-shaft gears.

Yang Hui didn't know that Garrett would do such a thing, and now Yang Hui just felt that Garrett was too pitiful, and he actually made this kind of thing, it was so unkind, it was just like a pig.

In fact, Garrett is still quite wronged, and others don't know that they will redesign the gearbox in a few years. Now the version given is already the version used by Garrett himself, and there is absolutely no concealment.

Of course. Then again, Garrett had adopted a planetary gear drive on the TFE731 engine at this time. If you want to bring in not to mention 8 million US dollars, I am afraid that 80 million US dollars will be difficult to stop.

At that time, the reason why Garrett sold the gear transmission technology to Southwest Science and Industry was probably related to Garret's own assessment, and he felt that the fixed shaft gear had no future.

Yang Hui, a reborn person, although he knows the general trend of the future generations, but for these little things, Yang Hui really can't remember them clearly, after all, he is just a normal person.

Now the bell construction raises the question. Yang Hui also has to explain well: "The technical problem is not serious, you must know that we cooperate with MTU, and when we encounter such technical problems, we must also need MTU to contribute." We are in the design of the gear transmission system, the input of both sides, and the output are divided in half, and they will definitely contribute to the joint research and development and the benefits of the joint development. ”

Yang Hui proposed a solution to the problem: make full use of MTU's technical capabilities. Germany has absolute advantages in transmission machinery and metal processing, and cooperates with Southwest Science and Industry. It's possible to defeat this technology.

Zhong Jianshe knows the current technology accumulation of Southwest Science and Industry, and it can be said that there is no technical accumulation of planetary gear transmission technology, so he still has some doubts in his heart.

"Yang Group, I admit that what you said makes sense. We are now going back to the planetary gear route, which should be the only possible solution technically, but we have no technical accumulation in this area. Germany, with their basic technology, is in the design of the back. I'm afraid that MTU will take more of the initiative. ”

This concern is not unreasonable, and the two sides were originally equal in the development. Now because of technical problems, it has become dominated by MTU, which is a big loss, which is absolutely not good.

This is a big problem, looking at the fixed shaft gear transmission system on the side, thinking carefully, can there be some technology that can be used for reference, if it can also be wasted, their eight million dollars loss is not big.

Looking left and right, I finally found a shining point, there is something that may be used to become the technology accumulation of Southwest Science and Industry.

"The speed of this set of fixed shaft gears is very high, I am afraid that the planetary gears on the new engine are also like this in terms of speed, and now the TFE731 engine can complete the cooling, then the cooling system of this fixed shaft gear must have something worth learning."

Yang Hui This is a word to wake up in a dream, the cooling system used in the fixed shaft gear of TFE731 is quite good, the technology is very amazing, take a good study, and it will definitely be used on the new planetary gear in the future.

The high-speed gear system will definitely have a fairly high temperature, and it can solve the cooling problem on its own side, which is definitely the core technology, which is used to wrestle with MTU, and it will have the confidence to sit on an equal footing with MTU.

"Yes, Yang Group, what you said is really reasonable, according to your ideas, I found that there are really some good things that can be used on this set of fixed shaft gears, which is not only the cooling of the transmission system is very technical, but also other aspects."

After Zhong Jianshe started with Yang Hui, he searched for it according to Yang Hui's ideas, and sure enough, he really found something good again, and some of the things in this set of extreme fixed shaft gears are really hard to say whether it is good or not, which is really laughable.

"Between the high-speed gears, they can run smoothly and have such a long life, Garrett has also put some effort into the manufacture of these gears, which can also be of great benefit in the development of our planetary gears in the future."

But that's not the case, the current set of seemingly backward fixed shaft gears, can go the wrong way, but also come up with a usable finished product, there must be some quite extreme things in the technical content.

And this extreme thing is the ultra-high gear speed, which is already comparable to the maximum speed of the new eight-ton turbofan on the planetary gear.

At the same speed, the TFE731 engine can overcome the defects caused by the friction between the gears meshed at high speed, and will not cause gear failure too quickly and ensure the life, which is also a major highlight.

Take a good look at it and absorb it, it is also a technology that can be used directly, so it seems that there is no future for development, and there is still a lot to learn from it.

"Yes, yes, you are looking for it, and you find that this set of fixed shaft gears really has some very technical technology, and with these technologies alone, our eight million dollars are not a loss. This thing can be used directly on the planetary gear of the new engine, and the manpower and material resources saved in the middle are quite valuable. ”

After finding out the reason, coming up with a new technical route, and pointing out a bright road, Yang Hui was relieved. Although Zhong Jianshe didn't know whether planetary gear transmission was feasible or not, he was naturally excited to have the most reliable way in comparison.

Zhong Jianjian's face was excited, it seemed that this guy couldn't hide something in his heart, and he must have been eager to plan to practice it now.

Yang Hui no longer stays here, now time is precious, do whatever you need to do, the problem has been solved, even Yang Hui has no heart to continue to stay here. This set of fixed shaft gears that makes people laugh and cry, Yang Hui doesn't want to watch it a second time after watching it once.

"Let's go, now the problem is solved, we will design the building, each has its own business, for this time we and MTU cooperation in the development of new engines, we are involved not only in the gear transmission system, engine control system, core engine development is our work, I want to explain my opinions, I hope to help the development of the engine."

On the development of the core engine of the new engine, Yang Hui has always had his own opinions, last time he didn't have time to put forward his own opinions, he was pulled to be a pastemaker, this time back to the institute must raise these questions. (To be continued......)