Chapter 570

Yodel was shocked. Looking at the young technicians who were talking and laughing in front of the S-70 helicopter, his eyes became a little complicated.

It's not surprising that Yodel is like this, because the integrated gear, shaft and bearing structural components are not ordinary components, but one of the most cutting-edge key components of helicopter.

Because of this key component, the service life of the main reducer of the helicopter has increased from about 3000 hours in the 1970s to more than 6000 hours.

The overall performance of the helicopter, such as safety, adaptability and maintainability, is not a leap, but a leap.

As for what is the final drive?

If the heart of a helicopter is a turboshaft engine, the main reducer of the helicopter is the aorta connecting the heart.

Because of this, a helicopter with a main reducer is like a car with a gearbox. It is not important, but rather important.

So the quality of the main reducer directly reflects the performance of the helicopter, but this thing is too complex, dense gears, bearings, connecting shafts closely together, not to mention anything else, just the optimization design of various gears and bearings will make the designer's thick hair directly bald.

What's more, the internal gears, shafts and bearings are all precision components of aviation grade. The processing is time-consuming and laborious. It also needs a lot of lightweight materials and rigid materials. In a word, the difficulty is no less than that of ordinary aeroengines.

Because of this, only the United States and the Soviet Union can make a good job of helicopter main reducer in the world, and Europe is a brother in this respect. Only relying on the technology output of the United States can we barely maintain the status of the so-called "helicopter development and production area".

But even so, the quality of the main reducer is not the same. Of course, the top is the United States. The service life of most helicopters in the world is around 3000 hours.

The life span of the main power train components of the American Apache armed helicopter has reached 8000 hours.

The Gulf War at the beginning of the year well proved this. In the Middle East desert area with changeable climate and severe sandstorm, Apache helicopter showed good sustained combat capability.

Compared with the "little antelope" helicopter sent by France, the "Bobcat" helicopter from Britain is far less efficient.

The reason why there is such a contrast is that the United States has applied a new shaft bearing gear integration technology in the main reducer of their Apache armed helicopter.

The original separate shaft, bearing and gear are regarded as a whole by using the unit design principle, and then the finite element software is used for modeling to form the completed model. Then the design software is used for drawing, and then it is manufactured by precision machining, complex heat treatment, electron beam welding, laser welding and other advanced processes.

In this way, more than ten gear, shaft and bearing components of a certain part of the main reducer are completely replaced by this compact structural component. In addition, the use of very precise processing technology makes this part of the main reducer components not only simple in structure, convenient in maintenance, but also greatly reduce the overall structural weight.

More importantly, because of its integrated design, the structural optimization degree is much higher than that of the original distributed component design, the lubrication effect is not only efficient, but also with the suppression of the overall vibration, the service life is improved at once.

A total of several such shaft bearing gear integrated components are used in the main reducer of Apache armed helicopter, saving nearly 100 parts.

Not only can the main reducer of Apache armed helicopter transmit high speed of 20000 rpm, but also its overall life is close to that of its turboshaft engine.

At the same time, it also makes the power assembly of Apache armed helicopter more compact and light, and reserves great redundancy space for subsequent armor protection and future installation of "Longbow" radar.

Therefore, it is not too much to say that the shaft bearing gear integration technology is a subversive core technology.

In contrast, the Soviet Union is much inferior. It still adopts the traditional separate design of gears, shafts and bearings, with centralized optimization. It's no problem to use them. It's just that the service life is very difficult to exceed 3000 hours, and the daily maintenance is also very inconvenient. The accident rate is high, let alone the compact design. Just compare the fuselage height of mi-28 and Apache .

M-28, 4.81 m high; Apache 4.05 m high.

The difference is 0.76 M.

Despite the gap of more than half a meter in height, on the battlefield, it is equivalent to an increase of several orders of magnitude in the area to be shot.

Don't the Soviets want to make the mi-28 helicopter low and have a smaller area to be shot? It's not that I don't want to, but that I can't. for this reason, the technology is almost meaningless, and I can't give consideration to both compactness and service life.

The European is better. The main reducer in the a-129 armed helicopter made in Italy applies the shaft bearing gear integration technology.

However, many of the core technologies of Italian a-129 armed helicopter are purchased from the United States, including the shaft bearing gear integration technology. The Italian Contractor submitted the design drawings of the main reducer of a-129 armed helicopter to the United States, and the United States helped to optimize the shaft bearing gear integration technology, which led to the a-129 armed helicopter The elevator has excellent power transmission performance.In a word, in a word, the shaft bearing gear integration technology is the key to the transformation of helicopters. Even in Europe, where aviation technology is developed, it is absolutely at the forefront.

Aside from that, Europe's "tiger" helicopter has been in operation for several years, but the test model has been delayed. What's the reason? It is not that the performance of the shaft bearing gear integrated technology applied to the main reducer is not up to the standard, which delays the whole progress.

Can China, backward and poor, do things that even Europe can't do reasonably? How is that possible?

"Mr. Yodel ~ ~ Mr. Yodel?"

Just after Yodel was shocked, he finally digested Gu Jingyou's words and completely denied that China did not have the ability to possess this kind of key technology with his unique rigorous analysis of the German nation. The concern voice of the land aviation leader who was asked by him interrupted Yodel's puzzle.

He quickly apologized with a smile: "I just thought about something. It's ok It's ok... "

"If you have any discomfort, there is a doctor in the station who can check for you." The land aviation leader was still very concerned about Yodel's situation. Yodel waved: "no, no, I'm really good."

As soon as I was ready to ask the leader of the land and aviation department about Gu Jingyou's shaft bearing gear integration technology, I heard the sound of the helicopter propeller outside the hangar and immediately interrupted Yodel's words. The leader of the land and aviation department on the opposite side also had some differences. He asked the accompanying officers and then said with a smile to Yodel: "It was just a civil helicopter that landed temporarily to add fuel, which was approved just yesterday."

Yodel suddenly nodded. It's common for civil helicopters to land and supply in military stations. There's no way to let most of the helicopters belong to the type of short legs.

So subconsciously, he glanced at the airport outside the hangar. As a result, Jodel immediately opened his mouth and almost subconsciously called out: "S-64, aerial crane?"

Then he quickly shook his head: "no, it's much smaller than the overhead crane. This is..."

As a result, before he could guess the model of the strange helicopter that was landing outside, the young man named Zhuang Jianye, who was not far away, lost his voice and said, "how did our group helicopter come here?"