Hearing that the progress of the 624 Institute was not delayed, Yang Hui was naturally happy, at this time, if there was a mistake in the development of the core machine, then the whole project would make Yang Hui look good.

Fortunately, there is no problem with the development of the core machine here, not only the data is being transported to the southwest science and industry, but even a core machine that can be operated has been brought here, and I believe that this will not lag too far behind in the development progress at the bidding meeting ten days later.

Of course, it is absolutely impossible to directly install the core on the aircraft, and more needs to be developed with other supporting parts, including the development of the engine control system of Southwest Science and Industry, and the low-pressure rotor, large bypass ratio fan, casing and other cold-end components distributed to MTU company.

Yang Hui, who put down the phone, can't wait, and has not yet seen the core finished products and data, but this unnamed large bypass turbofan engine has a special technology, and now this technology is just working overtime to develop it in cooperation with Southwest Science and Industry and MTU Company.

I found an old jeep and drove to the second institute, during this time Yang Hui needed to focus on the development of the engine, the FC-17 joint strike fighter project has been carried out under the auspices of the chief engineer, so there is no need to worry about it here.

The bumps along the way are still very worthwhile, which at least allows Yang Hui to come to the second institute as quickly as possible, this place is still so familiar, only when Yang Hui goes deep into the second institute, can we see the changes in the past five years.

Still proficient in walking to the scientific research building, what he is looking for now is Zhong Jianjian, this guy is responsible for the development of the key technology gear transmission system of the large bypass ratio turbofan engine, although this key sub-project has the participation of MTU. But in the final stage of engineering trial production, it is still necessary to do it by Southwest Science and Industry.

The door to the design team's office was open, allowing Yang Hui to walk in without disturbing anyone. What he saw was that Chinese and German technicians were working selflessly together.

"This is"

Yang Hui didn't want to disturb these technicians, he wanted to wait until someone in the middle found out before talking about anything else. But when he saw the iron lumps on a display table, he couldn't help but ask.

And with this question, the tranquility of the design team was finally broken, Zhong Jianshe was familiar with Yang Hui's voice, and immediately came to the side to explain what those things were.

A little embarrassed, he picked up a planetary gear that Yang Hui had just put down, and carefully explained what this thing was, although Yang Hui knew the general technology of geared turbofan engines, but among the parts here, Yang Hui could only scratch blind.

"This is one of the key components in the gearing system we designed: planetary gears. According to our design, there will be a total of five planetary gears rotating around the middle sun wheel in a set of transmission systems, theoretically only one planetary wheel is enough, but because we need to drive high speed and large load, we have to choose to add four more planetary wheels, so we can use this technology on the seven-ton engine. ”

Here is explaining the function and design principle of these planetary wheels, but Yang Hui is not an idiot who still can't understand it at this time, and his question just now also expresses his incomprehension that this thing will produce results so quickly.

"I get it, now I mean. It always feels a little unreal that you were able to come up with a finished gearing system so quickly, this technology shouldn't be so easy to overcome, right? ”

Affection Yang was always questioning this progress, and Zhong Jianshe also smiled. He hoped that he would be able to finalize this transmission system now, as Yang Hui thought, but this was not the case.

Reluctantly, he put down the gears in his hand. Zhong Jianshe picked up the outer gear ring, and handed it to Yang Hui to show the outside without teeth.

"Take a look. The inscription on this is very clear, this is our experimental model. Although it is manufactured in accordance with the design of the gear parameters, but in other such as the manufacturing process is not mature, we are now working with the Liyang factory process department to tackle key problems, and strive to come up with all aspects of the qualified transmission system as soon as possible, now you see the quality of this thing is really miserable. ”

After listening to this explanation, Yang Hui figured out the situation, otherwise it would not have been possible to make such a fast progress, and now it seems that the progress of this thing has not become the general existence of Zenith people engaging in scientific research.

"However, your development progress is still quite fast, this has reached the stage of manufacturing process development, I think this should be able to keep up with the progress of our engine assembly, this is already a very remarkable miracle, after all, this is also an unprecedented bold use, just like the development of three-rotor engines by Rolls-Royce."

Yang Hui's words are very high status of this gear transmission technology, but these technical R & D personnel did not shirk, they as technology developers naturally know what this technology is, and it will not be inappropriate to say that it is more advanced than the current international engine of the same level.

At this time, the technical director of the German MTU company also came aside, don't think that the Germans are really just rigid to the end, people just abide by the local rules of the game, and when they go to the republic, they also abide by the rules of the republic.

First, he was half-baked with the Chinese phrase 'hello', and then he started to talk about business in Germany, which is a more complex and professional place where he can't master Chinese to express his meaning.

"We didn't have any problems with the design, and we used professional mechanical engineering simulation software to simulate the working environment of the gear transmission system, and the simulation data showed that it could withstand the 7.5 tons of thrust required by the current engine, and there was still a 9.6 percent load allowance, which is not to be worried."

Hearing that the MTU company is so confident, Yang Hui is also noncommittal, no one knows what kind of performance the gear transmission system will have in the end, anyway, this kind of cross-generation technology has always been full of uncertainties, otherwise, a company like Rolls-Royce will not be in the three-rotor technology research, because there are too many technical problems to bankrupt the company.

Now Yang Hui can only silently wait for the follow-up test of the whole machine to expose the problem, if there is no nature is the best, if there is, then it can only be a trick, and finally see if everyone can persevere, when the sub-technology is detailed to this level, Yang Hui, the reborn person, is not too big to help cheat on the technology.

Yang Hui was worried about the design of this deceleration transmission system, but what he didn't know was that in the previous section, there were many turbofan engines with gear transmission systems developed by Pratt & Whitney, but what few people knew was that these engines were the product of international cooperation, and this gear transmission system was designed by the humble spaghetti country.

This can at least prove one point, that is, the design of the gear transmission system is not too big a problem, more problems lie in the service life of the transmission system, long-term use of the transmission accuracy.

"MTU friends are so confident that it is naturally good, we Southwest Science and Industry also hope that the development of this key gear transmission system can be successfully completed, which will be a major good news in the development of this engine, and even our future engine in the market will be of great help."

As he spoke, Yang Hui put down this set of metal gear models, and walked to the side thoughtfully, as if he was no longer too eager for the development of this traditional gear system for the time being. (To be continued.) )