Chapter 970 The Defense Work Committee is definitely interested (two chapters first)
This reducer actually comes from the product of the combination of the Russians and Citimen. The theory was proposed by the Russians in 1947, but the physical invention was invented by the Citimen in 1953, obtained a patent in 1955, and was published in 1960.
The earliest practical application was in aerospace. This thing was small in size, large in speed reduction ratio, accurate in transmission, and theoretically 0 backlash, which was most suitable for aerospace where every gram of weight had to be used to drive into the sky.
Although there are defects of low loads, the aerospace industry these days does not have that large load to drive.
On the other hand, if the planetary reducer has insufficient accuracy, this kind of reducer can be replaced, and its macroscopic transmission structure looks very different from that of the planetary gear reducer.
As for the issue of patent fees... I have to ask Mr. Lafayette about this.
Although this thing is not the latest, we have been blocked by technology for a long time. Not to mention the comrades from the Third Rolling Factory, even the comrades who specialize in this in the Eleventh Machinery Department are unheard of. After all, there is almost no channel for them to access related news in an exhibition in New York in 1960.
"Mr. Gao, it seems that this cannot be transmitted." Although they don't understand, they still know the basic requirements of transmission. These things seem to be opposite each other, and they seem to be unable to be transmitted.
Gao Zhendong nodded: "Yes, there is something missing. Add this, you can see it." He changed the thing that looked like a gear in the inner ring and drew it into an ellipse with a difference of not too much between the length and the short axis. Then the teeth of the inner wheel meshed with the teeth of the outer ring in the direction of the long axis of the ellipse.
Then Gao Zhendong added a rotatable cam into the inner ring. This cam connects the input shaft, which is also the reason why the inner ring becomes elliptical. The inner ring is soft and connects to the output shaft. It is pushed by the cam and rotates around the outer ring. The outer ring has 2 teeth more than the inner ring. It is precisely these two teeth difference that allows the inner wheel to rotate in the outer ring, and the speed of the inner wheel is strictly positively correlated with the speed of the cam.
After listening to Gao Zhendong's introduction, the comrades from the Eleventh Machinery Department also roughly understood the principle of this reducer: "This reducer is really good, but it may not have a long lifespan, right?"
Gao Zhendong nodded: "Yes, the inner wheel of this is constantly deforming, so the material requirements are very high, and the life span is indeed not as high as ordinary planetary gear transmissions. However, for some things, life span and cost are not the first priority. Moreover, the efficiency of this reducer is much worse than that of planetary gear transmissions, which is more than 70%. "
Is there anything the most important thing? Even if the lifespan is a little lower, as long as you can make it yourself, it will be very different. At worst, you can change a few more things. There are not many things that require this precision these days.
As for transmission efficiency, it was given up to the back in front of accuracy.
The comrades from the third branch factory were very happy. As long as Mr. Gao opened the cost here, it would be much more convenient for them to do things: "Okay Mr. Gao, let's organize some manpower and research the key points to see if we can overcome this reducer as soon as possible."
Unexpectedly, Gao Zhendong shook his head: "No, this thing was successfully developed at Songjiang Textile Industry Institute last year, and there are ready-made things. Although it may not be possible to use it on you, you can write a note and I will sign it. You can find a department to coordinate, go to Songjiang Textile Institute to learn from the scriptures, and come back to improve it. This will be much faster."
This is a very interesting thing. The first harmonic reducer in China was created by Songjiang Textile Institute, but other ministries and commissions have limited knowledge and application. As for the subsequent application of Songjiang reducer, it is estimated that it is not very widely used, and the theory and subsequent products and applications have not been fully developed. It was already in the 1980s that harmonic reducers truly developed in the country.
But no matter what, Songjiang Textile Institute holds the physical object in his hand and has completed the research on the entire reducer. Whether it is imitation or self-developed, in short, the experience and technology are somewhat basic. Through their intervention, the research difficulty of comrades from the Third Branch Factory and the Eleventh Machinery Department can be greatly reduced.
"Really? That's great! Will there be no other person agree?"
The comrades in charge of the machine tools were overjoyed about this unexpected surprise, but they didn't expect that there was actually something. It seems that General Manager Gao not only has profound skills, but also has a good knowledge of the development status of various domestic industries, and has a grove in his heart.
However, whether there is any other person to share the technology is a different saying.
This problem does exist. Gao Zhendong thought for a while and said with a smile: "This should be no problem. There is a game of chess in the country. But in order to explain the importance of this matter to the comrades over there, let's call the application first. After our two departments sign, I will use it to the Defense Work Committee to sign it. They can use it."
The most famous application of harmonic reducers in China should be in two aspects. One is robots, which is the most popular and popular, but it is still far away now. The other one is our spacecraft, nature, and satellites.
For the Defense Working Committee, it would be fine if you don’t know this thing, but if you know it, you definitely hope it can be used.
This reducer has a small size and a large transmission ratio. The motor, reducer and output shaft can be integrated into a coaxial arrangement. It can be said to be very useful in space weightless environments. Although weightlessness does not mean losing mass, the advantages of this transmission are enough to make everyone excited, and it also covers up the weakness of its small load to the greatest extent.
This kind of reducer was first used in space in Citi. Within the 20th century, Citi was selected strictly and trustworthy. Gao Zhendong once suspected that the early way our satellites arranged solar panels was often pasted around the satellite. There may be reasons why solar panel deployment and control mechanism technology in space were not up to date. In any case, half of this kind of sticking around would theoretically not work, and most of the working parts could not work in the optimal direction of solar radiation. If the technology passes, this structure will never be used. Of course, this technology is not only transmission, but also spacecraft attitude control technology.
As for whether the harmonic transmission of Songjiang Textile Industry Institute can really meet the needs, it doesn’t matter to Gao Zhendong. This is just a way for comrades to understand and master the harmonic transmission as quickly as possible. If the spot stock is not suitable, the harmonic transmission principle and design that Gao Zhendong grasps in his hand will be the ultimate killer.
When they heard Gao Zhendong bring out the Defense Working Committee, their comrades were very confident. This matter was settled. All the comrades knew what the Defense Working Committee represents in this year.
"Okay, Chief Engineer Gao, let's implement this matter in the future. So what is the second transmission mechanism you are talking about?"
Gao Zhendong smiled and said, "Have you heard of the cycloid pinwheel transmission?"
The cycloid pin wheel is also a planetary transmission mechanism, but it is a bit special. Putting aside the complex principles, it is less accurate than the harmonic transmission in terms of performance, but it has a high load and higher transmission efficiency, and also has the characteristics of a large transmission ratio and a small size.
Compared with planetary gear transmission, this product has much higher accuracy, and compared with harmonic transmission, this product has better load and efficiency. It can be said that the overall performance is quite excellent and the scope of application is very wide.
However, the disadvantage of this thing is that it is difficult to manufacture and has high requirements for manufacturing accuracy. Because it is a head-on collision, the harmonic transmission has a circle of soft teeth and can be made up by deformation.
The history of this thing is longer than that of harmonic reducers. It was proposed in 1926, but it was only started in China in the 1960s.
"I have heard of this, but the manufacturing requirements are very high. We have not learned relevant technologies and theories, so it is difficult to enter this field."
For them, it is only limited to hearing, but they have not yet understood the specific characteristics and advantages of the country, and they are still exploring where to use it.
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Gao Zhendong smiled and said, "If you haven't learned it, you will definitely have some research. You will learn it at the fastest speed first. After mastering the basic framework, I will find a way to find the remaining theories and key points. As for manufacturing, you can use harmonic deceleration to achieve accuracy, and then use this accuracy to build a cycloid pin wheel. Let's take it step by step. Moreover, this thing is a foundation, and behind it, there is a more interesting transmission mechanism."
Gao Zhendong decided to make the Japanese feel uncomfortable.
The cycloid pin wheel is a good thing, not only machine tools, but also robot heavy joints, construction machinery, etc. can be used. And there is a big killer behind it, but that thing is too advanced and can be put on for now.
When he heard that Chief Executive Gao took over the responsibility again, the comrades relieved their hearts. Chief Executive Gao said everything, "It's okay."
I haven't heard that Chief Engineer Gao has let go of the empty gun. As long as he has the opportunity to learn, learning is the norm for them. In order to build this CNC machine tool, many comrades first took over Chief Engineer Gao's "Principles of Automatic Control".
As soon as Gao Zhendong left, the comrades from the 11th Ministry of Machinery and the Third Branch immediately became busy. While contacting his department for implementing the cycloid pin wheel, he was responsible for applying for harmonic reducers to three ministries and commissions.
Time is endless, every minute and every second is precious.
Gao Zhendong himself was very satisfied with this. Although the machine tool is not like other things, it seems that he can't tell any high-tech at all, but in fact there are many technical problems in details, and the progress is very good.
At the same time, the machine tool itself is also extremely important and is one of the most important branches of basic production tools.
Gao Zhendong has seen the linkage between their computer-aided design (CAD) software and machine tools. Although the accuracy is not enough, at least the appearance of simple parts can be consistent. Seeing that CAM (computer-aided manufacturing) is somewhat eye-catching.
Compared with the Internet, CAD and CAM effects are more immediate at this stage.
(This chapter ends)