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Chapter 570 Our Group¡¯s Helicopter

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    Yoder was shocked, and then looked at the young technicians talking and laughing in front of the S-70 helicopter, his eyes became a little complicated.

    ¡°It¡¯s no wonder Yoder is like this, it¡¯s because the integrated gear, shaft, and bearing structural components are not ordinary components, but one of the most cutting-edge key components in aircraft such as helicopters.

    Because of this key component, the service life of the helicopter's main reducer has been increased from about 3,000 hours in the 1970s to more than 6,000 hours.

    ??It has been doubled. This improvement in the overall performance of the helicopter such as safety, adaptability, and maintainability is not a leap, but a leap.

    As for what is the main reducer?

    If the heart of a helicopter is the turboshaft engine, then the main reducer of the helicopter is the aorta connected to the heart.

    Because of this, the main reducer in a helicopter is like the gearbox in a car. It is not important, but quite important.

    Therefore, the quality of the main reducer directly affects the performance of the helicopter. However, this thing is too complicated. The dense gears, bearings, and connecting shafts are tightly meshed together. If nothing else, it is just the optimization of various gears and bearings.  The design will make the designer's thick hair directly bald.

    What's more, the gears, shafts and bearings inside are all aviation-grade precision components. Not only is the processing time-consuming and laborious, but also requires a large amount of lightweight and rigid materials. In short, the difficulty is no less than that of ordinary aviation.  engine.

    Because of this, only the United States and the Soviet Union can make helicopter main reducers in the world. Europe is a younger brother in this regard. It needs to rely on the technology output of the United States to barely maintain its status as a so-called "helicopter development and production area."

    But even so, the quality of the main reducer is not the same. The top one is of course the United States. At a time when the service life of most helicopters around the world is around 3,000 hours.

    The service life of the main power transmission components of the American Apache helicopter has reached 8,000 hours.

    The Gulf War at the beginning of the year well proved this point. In the desert areas of the Middle East with changeable climate and severe sandstorms, Apache helicopters showed good continuous combat capabilities.

    "Compared with the "Oryx" helicopters sent by France, the accuracy rate of the British "Lynx" helicopters is significantly lower.

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

    The originally separate shafts, bearings and gears are treated as a whole using the unit design principle, and then finite element software is used to model them to form a complete assembly model. Then the design software is used to draw the drawings, and then precision machining and complex  Heat treatment, electron beam welding, laser welding and other advanced processes are used to manufacture it.

    In this way, more than ten gears, shafts and bearing components in a certain part of the original main reducer are completely replaced by this compact structural component. In addition, very precise processing technology is used during processing, making this part of the main reducer  The device components are not only simple in structure and easy to maintain, but the overall structural weight is also greatly reduced.

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

    A total of several such shaft-bearing-gear integrated components are used in the main reducer on the Apache armed helicopter, eliminating nearly a hundred parts.

    Not only does the main reducer of the Apache armed helicopter can transmit a high speed of 20,000 revolutions per minute, but the overall lifespan is also close to that of the turboshaft engine it is equipped with.

    At the same time, it also makes the power assembly of the Apache armed helicopter more compact and lightweight, leaving a great deal of redundant space for subsequent armor protection and the installation of the future "Longbow" radar.

    Therefore, it is no exaggeration to say that the shaft-bearing-gear integration technology is a disruptive core technology.

    In comparison, the Soviet Union is much inferior. It still uses the traditional separate design of gears, shafts, and bearings, and they are centralized and optimized. There is no problem in using them, but the service life is difficult to exceed 3,000 hours, and daily maintenance is also very difficult.  It is inconvenient and the accident rate is high. As for compactness, there is no need to think about it. Just compare the height of the Mi-28 and the Apache.

    Meters - 28 is 4.81 meters high; Apache is 4.05 meters.

    The difference between the two is 0.76 meters.

    " Don't look at the difference of more than half a meter in height. When placed on the battlefield, it means that the area to be bombed increases by several orders of magnitude.

    Don¡¯t the Soviets want to make the Mi-28 armed helicopter low and have a smaller target area?  No??I don't want to, but I can't. For this reason, the technology is lame and there is no way to balance compactness and service life.

    Europeans are better. The main reducer in the A-129 armed helicopter produced in Italy uses shaft-bearing-gear integration technology.

    It¡¯s just that many of the core technologies of the Italian A-129 armed helicopter are purchased from the United States, including shaft-bearing-gear integration technology. The Italian contractor used the design drawings of the main reducer of the A-129 armed helicopter.  It was handed over to the United States, which helped optimize the shaft-bearing-gear integration technology, which resulted in the excellent power transmission performance of the A-129 armed helicopter.

    In short, in a word, the shaft-bearing-gear integration technology is the key to the rebirth of helicopters. Even in Europe, which has developed aviation technology, it is still at the absolute forefront.

    Aside from other things, the European "Tiger" helicopter has been launched for several years, and a testable model has not been released for a long time. What is the reason?  It¡¯s not that the performance of the shaft-bearing-gear integration technology applied to the main reducer is not up to standard, which delays the entire progress.

    Even in Europe's reasonable things, can it be achieved by China who is behind and poverty?  How can it be!

    "Mr. Yodel~~Mr. Yodel?"

    Just after Jodel was shocked, he finally digested Gu Jingyou's words, and with his uniquely German nation's rigorous analysis, he completely denied that China did not have the ability to possess such key technologies. The Army Aviation leader he was questioning was concerned about  The sound interrupted Yoder's confusion.

    He quickly smiled apologetically: "I suddenly thought of something just now. It's okayit's okay"

    "If you feel uncomfortable, there are doctors on site who can check you out." The Army Aviation leader was still very concerned about Yodel's condition. Yodel quickly waved his hand: "No, no, I'm really fine."

    As soon as he finished speaking, he was about to ask the Army Aviation leader next to him about the shaft-bearing-gear integration technology that Gu Jingyou just mentioned. However, he heard the sound of helicopter propellers turning outside the hangar, and suddenly he wanted to know what Yoder had to say.  Interrupted, the Army Aviation leader on the opposite side also had some differences. After asking the accompanying officer, he smiled and said to Yodel: "Just now, a civilian helicopter landed temporarily to add fuel. It was approved yesterday.  "

    Yoder nodded suddenly. It was common for civilian helicopters to land at military bases for supplies. There was no way that most helicopters had short legs.

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

    Immediately he shook his head quickly: "No, it's much smaller than an aerial crane. This is"

    As a result, before he could guess what model the strange helicopter was landing outside, he heard a young man named Zhuang Jianye not far away shouting in the same surprise: "Why did our group's helicopter come here?  "

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