"Team Leader Ding, you said that it will take a year to produce results, I can't wait, let you recruit technicians to do engine improvement together. Now that two months have passed since the technical staff were recruited, is it time for your progress to achieve some phased results? ”

As soon as Yang Hui said this, Ding Lei had already been prepared, he knew that this time Yang Hui must have come to see the new powertrain of the 750 motorcycle, so he had already prepared.

After everyone's efforts, the first engine prototype has been successfully developed: "Secretary General Yang, come and see, this is the first transmission of our new engine, and it was used for the first time just a week ago. ”

Hearing that the prototypes were out, this was good news, Yang Hui, led by Ding Lei, came to a test bench next to him, and the powertrain on it had been fixed.

The motorcycle engine horsepower is not too big, and the technical content of the construction of the test bench is not too high, and the design drawings of the test bench were obtained when I was in Hongdu, and now the construction has been completed and put into use for several months.

A group of people are surrounding this powertrain, and the most concerned thing is the reducer, which is the key breakthrough of the change.

Ding Lei introduced the improvement of the transmission: "Our current transmission improvement is completely different, and it can be more than a little different from the prototype transmission. First of all, we added a crankshaft vent under the transmission air filter, and of course the bulk of the changes were made in the gears. ”

Needless to say, Yang Hui also knew that Ding Lei said this to Yang Hui before he left last time, and it was certain that he would increase the gear, but when Yang Hui really heard the introduction, he was still shocked by the strong design ability of these guys.

Ding Lei took out the design materials. He then explained: "Our new transmission has been increased from four forward gears to five forward gears: 3.60 for the first gear, 2.44 for the second gear, 1.96 for the third gear, 1.48 for the fourth gear, and 1.16 for the fifth gear. That's one more forward gear than the original four forward gears. As long as the driver shifts gears frequently while driving, our fuel consumption will be well controlled. ”

Between words. The engine has been started and the five forward gears have been demonstrated. With the continuous changes, Yang Hui can hear the sound of the gear is very clear, without a trace of noise, it seems that this improvement is feasible, but it is not to know whether there will be a problem with the matching of the engine.

Yang Hui himself tried to try the five forward gears of the transmission, from low to high, and from high to low.

"Click"

The mechanical beating sound when the gear is successfully changed is crisp and noiseless, and the force required to change the gear is not too great, so it seems that this improvement has been successful now.

"Secretary General Yang, when you were in the first gear. Try to continue downshifting, and there will be unexpected surprises. ”

Originally, Yang Hui was quite satisfied with this improvement, the first improvement can have such a big progress is really good, not wasted so much money investment, the base of the 750 nephew engine assembly design is successful, as long as there is no problem, with these five forward gears can definitely achieve good sales results.

But hearing that there were still surprises, Yang Hui was not calm, and gradually lowered the gear until the first gear. Then I went down nervously, and I didn't think about it, and there was really a surprise.

When you descend from first gear, you can clearly see that the direction of rotation of the output shaft has changed. If so, this transmission can be considered more perfect.

As Yang Hui thought. Ding Lei continued: "That's right, our new engine is not just an added forward gear, but also builds on the original. We've also added a reverse gear with a reverse gear reduction ratio of 4.356. Hook up the reverse gear. The output shaft enables steering, and the motorcycle can automatically travel backwards. ”

And so it was. This new engine has been installed with reverse gear, which will give the 750 motorcycle a new driving feeling, with this new technology Yang Hui fully believes that with this technology can occupy half of the 750 motorcycle powertrain.

Look at the technical data above the reverse gear technical route: the starting gear is changed to a duplex gear, the output shaft one and two gear combination sleeves are changed to a combination sleeve with external teeth, and a reverse gear is added between the pinion of the starting duplex gear and the external teeth of the coupling sleeve to change the output shaft steering.

Laymen will feel that they can't understand this technical route explanation, giving people a feeling of uncertainty, but Yang Hui can understand it. To learn aviation, we must first learn mechanical design, and gear transmission is a must to learn, so this gear transmission steering scheme, Yang Hui carefully thought about it and understood.

"That's right, according to your technical route, the new transmission can indeed achieve the design goal of adding a reverse gear, and I personally think you have no problem with this. Improve it well, and strive to pass the acceptance as soon as possible to achieve finalized production. ”

The civilian motorcycle engine design team came up with an improvement route so quickly, and came up with the first test transmission, Yang Hui is very satisfied with the current progress, as long as this continues, then at the end of 85, the 750 equipped with a new engine may appear on the market.

In these years, there are not too many civilians buying 750 such big guys, and the main sales force of 750 is still government departments, and in 85 years, some of the first rich places have begun to learn the tricks of surprise consumption at the end of the year.

So at the end of the year, it is the peak sales season for 750 such good things, at least at this time, Poussin, which is popular in government departments, has not spread on a large scale, and 750 is still the first choice for high-end goods in some government departments.

Understanding the progress of civilian transmissions, Yang Hui ran to the pneumatic design group, Yang Hui went to the side plate technology proposed before, and carried out preliminary theoretical exploration here, which will be planned to cooperate with the No. 10 project of 0611.

When Yang Hui was about to see the progress of the side plate technology, there was an unexpected situation, which made Yang Hui unreachable, but he had to solve it.

It's simple to say that Yang Hui proposed to use the TFE731 engine on the junior and intermediate coaches jointly developed by Hongdu at the base, which is the earliest engine chosen by K8 in the previous life, and now it is proposed that the use of this engine will naturally not be too much trouble.

After Hongdu approached the American Garrett Company, the owner of the TFE731 engine, Garrett also readily agreed to export the engine to the new trainer aircraft. The only problem was that Garret, for his part, was reluctant to sell this engine technology to the republic.

It is said that it is because the current TFE731 engine is still quite popular, although it is a small thrust engine, but its excellent performance, it still occupies half of the business jet market, which can be described as infinite.

Now Garrett naturally has no reason to sell this fragrant bun technology to the Republic, although even if it is sold to the Republic, the models produced by the Republic have no way to compete with Garrett Company for the market.

This also causes Garrett to be lukewarm in the requirements that Jarrett has been putting forward to Hongdu, anyway, you have to install my engine, but if you want to introduce a production engine, this must be considered.

This situation has been going on for half a year, and now the K8 has started the preliminary design, and the engine has not been completely decided, which makes Hongdu a little crazy.

Of course, it is not Garrett who completely rejected Hongdu's proposal, anyway, people are dragging it, in a word, I am afraid it is still a matter of money, at this time, Zhuzhou Southern Power Machinery Factory, which was originally a better cooperation with Hongdu, will not work.

Zhuzhou 0331 factory did not have a big project, and Hongdu was almost a difficult brother, the state did not pay attention to it, and the 0331 factory naturally had no funds.

Even if Hongdu does it together, he still can't come up with enough funds to satisfy Garret's appetite for the technology of this engine, so naturally Hongdu has taken a fancy to the 0011 base, which is relatively alive and relatively alive now. (To be continued......)