Set sail1992

Chapter 578 Such a miraculous thing was actually done by my students
"Teacher," Zhang Qihang who entered the door greeted Professor Xu Qingwu familiarly: "I'm here to see if there is anything I can do for you?"

The Chinese New Year is coming soon. I have been busy with Huateng Industrial Group for several months. It is time for all the teachers, professors and students they brought back from Harbin Institute of Technology. Among them, the students went home directly from the Langya area. Those who take the car do the car, and those who take the train take the train. Huateng Industrial Group has already helped Zhang Qihang's brothers, sisters and sisters book bus and train tickets in advance.

As for the teachers from Harbin Institute of Technology and some of their family members who need to return to Bingcheng for the Spring Festival, Huateng Industrial Group also arranged for them the air tickets from Shungeng Airport in the provincial capital to Bingcheng Airport and helped them coordinate. A chartered car, waiting for tomorrow, the teachers will gather directly downstairs, take the chartered car provided by the regional transportation company to the provincial capital Shungeng Airport, and then take a flight of more than two hours, and arrive at Bingcheng comfortably on the same day .

For this arrangement of Huateng Industrial Group, the teachers and professors of Harbin Institute of Technology are really satisfied and can't be more satisfied. Professor Xu Qingwu is even more so. When he saw Zhang Qihang coming, his face was full of smiles from the heart: "Everyone!" Packed up, I’m not talking about you, the annual gift you prepared for everyone is really too rich..."

Before Professor Xu finished speaking, Zhang Qihang boldly said: "Teacher, this is what should be done, so don't tell me these things."

"Okay, okay, I won't say anything, I just feel a little bit ashamed..."

"What is there to be ashamed of?" Zhang Qihang smiled and said: "Teacher, you can't think like this. When it comes to value, is the help our school gives to our group comparable to this little money?"

"Ha ha……"

Professor Xu scratched his head. Senior intellectuals in this era are still very particular, and his face was a little red: Although it is true to say so, I am still a little embarrassed.

The reason why I am embarrassed is because the Huateng Industrial Group paid dividends two days ago.

Although the professors of Harbin Institute of Technology and the graduate students they led were very envious of the dividend distribution of Huateng Industrial Group, they didn't think it was unfair. A big red envelope was given.

From professors, associate professors to graduate students participating in the project, everyone has a share!
Each professor's red envelope is 5000 to [-] yuan, which is several times the employee's dividend, and even those students who follow their mentors to do projects receive a [-] yuan red envelope, which is basically equivalent to the employee's dividend.

The professors are of course very happy. Although Huateng Industrial Group has provided itself with good working, living and scientific research conditions, who would not like such a good thing?After a bit of humility, everyone accepted it; as for the students, of course, not to mention, in their opinion, this is almost like a pie in the sky.

Of course, Huateng Industrial Group has gained the most. After this red envelope, a considerable number of students have signed work agreements with Huateng Industrial Group, and they will come to work in Huateng Industrial Group after graduation. Huateng Industrial Group needs The price paid is nothing more than paying them monthly wages and counting their working years from now on. In general, Huateng Industrial Group has made a lot of money.

The two chatted for a while, and Zhang Qihang said, "Teacher, I have designed a gearbox during this time. Can you analyze it for me to see if it works?" "

"You designed a gearbox?"

Professor Xu Qingwu was a little surprised, but he thought that he, a student, could design a V-twin engine independently. In terms of his ability, it seems that it is not impossible to improve the existing gearbox... Yes, Professor Xu Qingwu took Zhang Qihang's words for granted. Zhang Qihang made some improvements to the existing gearbox... Thinking of this, he nodded immediately: "Gearboxes are not my major. I actually know gearboxes." Not many, but generally giving you some advice shouldn’t be a big problem... Well, Qihang, have you brought the blueprint?”

"Bring it."

Zhang Qihang nodded hastily, and at the same time took out a stack of drawings from his bag and handed it to Professor Xu Qingwu.

While Xu Qingwu took the blueprint handed over by Zhang Qihang, he was quite looking forward to it: I don't know what kind of gearbox my student made?Is the gear ratio between the various gears readjusted or the synchronizer optimized?or...

In the next second, Professor Xu's eyes froze: If I'm not mistaken, this thing is a hydraulic torque converter, right? !

In the field of gearboxes, hydraulic torque converters will only appear on automatic gearboxes, and they are hydraulic automatic gearboxes with a planetary structure. But just now I glanced over, this is not a gearbox with a planetary structure at all. A group of gears, isn't it just a manual mechanical gearbox, so, my students designed a manual mechanical gearbox with a hydraulic transmission at the input end? !
Thinking of this possibility, Professor Xu Qingwu's mentality is a bit explosive: put a hydraulic torque converter in front of the manual transmission, isn't this taking off your pants and farting-is it superfluous? !
At this moment, he was somewhat disappointed in Zhang Qihang, a student who felt that he had lost the innocence he had in the past, and was polluted by the big dye vat of society.But in the next second, Professor Xu Qingwu was stunned again: what happened to these solenoid valves and hydraulic control systems?

As we all know, manual transmissions do not have solenoid valves, because the human brain controls gear shifting through hands, so naturally there is no such thing as hydraulic control, so the interior of manual transmissions is nothing more than gear sets, clutches, and synchronizers. Well, it would be nice to have a synchronizer to assist when shifting gears. As for the lubrication and cooling inside the gearbox, there is no need for a special oil pump. It is basically a splash type. Simply put, the gears rotate to throw the lubricating oil to the moving parts. On the surface, so the question is, what is this gearbox with a hydraulic torque converter, a solenoid valve and a hydraulic control unit that are only found on a planetary automatic gearbox, and a large number of gears? ? !
At this moment, Professor Xu Qingwu was stunned. He had never seen this strange thing that should be an automatic transmission!
It’s no wonder that Professor Xu Qingwu is confused at the moment. In fact, in this era, there are only a few types of automatic transmissions. They are the most widely used hydraulic automatic transmissions with a planetary gear structure, also known as AT transmissions. ;

Another one is that although a small scale of commercial promotion has been carried out in Europe and Japan, the public has not yet accepted it, and the CVT automatic transmission using a steel belt or a belt;

Then there is the AMT gearbox used in Ferrari F1 racing cars and the dual-clutch DSG automatic gearbox used in Porsche racing cars. The AMT and DSG automatic gearboxes have not been used in civilian use at all, so I didn’t see them when I asked Professor Xu Qingwu. It's really not surprising at all with this automatic transmission.

Facing Professor Xu Qingwu's surprised and shocked eyes, Zhang Qihang explained: "Teacher, I call this gearbox a parallel shaft automatic gearbox."

Professor Xu Qingwu was taken aback for a moment, and couldn't help muttering: "Parallel shaft gearbox?"

"Yes," Zhang Qihang nodded and said, "Actually, it is a hybrid made by borrowing the design concepts of planetary automatic transmission and manual transmission."

"So it is!"

Hearing what Zhang Qihang said, Professor Xu Qingwu suddenly realized: I didn’t think about it in this direction before, but now I heard what Qihang said, it really is the case. This gearbox is really a planetary automatic gearbox and a traditional gearbox. A hybrid of manual transmissions.

But in this way, Professor Xu Qingwu couldn't help but feel strange, and couldn't help asking: "How did you think of making such a gearbox?"

Zhang Qihang said in his heart that I can explain that at the end of the year, that is, at the end of 1995, because Honda couldn't stand Aisin Seiki's neck getting stuck from time to time, it angrily created the world's first parallel shaft gearbox. And in September 1997, the world's first parallel-shaft 9-speed automatic transmission was installed on the newly unveiled sixth-generation Accord, and the reason why I took out this parallel-shaft transmission now is that Is it to grab this new concept of automatic transmission that will not encounter patent barriers in front of Honda?
Of course not!

However, Zhang Qihang couldn't help this problem. He said seriously: "The reason why I developed this automatic transmission is because when I checked the information, I accidentally found that our country is completely blank in the field of automatic transmission. At that time, I was curious. , I just want to know about the technical development of foreign automatic transmissions. It doesn’t matter if you don’t check the results. This investigation is shocking!
CVT is a type of automatic transmission that few people use worldwide and whose market share can be completely ignored. Almost all the patents on planetary automatic transmissions are covered by the two structures of Lavina and Simpson. Gearbox patent holders are monopolized. If our country wants to develop automatic gearboxes, we must either pay high patent fees to others in exchange for their consent and authorization, and at the same time face the danger of being stuck at any time, or Just find another way.

I have been thinking about it for a long time, wondering if it is possible to combine the traditional planetary automatic transmission with the manual mechanical transmission, so that this transmission can not only realize automatic shifting, but also effectively control costs, and then there is you The design I saw..."

Speaking of this, Zhang Qihang seemed a little embarrassed, and said shyly: "I have been messing around for almost half a year, and I have almost solved all the problems. I just want you to help me, teacher, to see if I am still there. Undiscovered flaws in the design..."

"Wait a minute," Professor Xu Qingwu was completely shocked, and he said in disbelief, "You mean, you made this gearbox by yourself?"

Toss out a whole new type of automatic transmission by one person?

Why is this so mysterious?

And I also took a general look at this gearbox, not to mention the software level and specific control logic, at least in terms of hardware level, the parallel shaft automatic gearbox made by my student still looks very good, I don't see any problems, just such an automatic transmission with no obvious problems at least at the hardware level, is it made by my own students?And it only took half a year? !

Professor Xu felt that his head was dizzy. Compared with his student, so many transmission experts in China should throw their heads into the river in shame.

"Ah..." Zhang Qihang nodded, with a silly and cute expression: "This thing is not too difficult, but it is a bit laborious to calculate..."

Isn't it difficult? !
Listen!

Is this what a human being can say?

Professor Xu Qingwu was so angry that he couldn't speak for a while. After a while, he adjusted his mood and said, "Well, tell me about your... well, parallel shaft gearbox."

"Okay, teacher," Zhang Qihang responded, and said, "As you can see, this is a four-speed automatic transmission, which uses the most core component of a planetary automatic transmission: hydraulic torque converter. With the hydraulic torque converter, the impact of shifting gears will be guaranteed to the greatest extent will not be too large, and the biggest difference between the parallel shaft automatic transmission and the planetary gear automatic transmission is that the internal use of horizontal gear transmission , Wet clutch shifting.

Different from the synchronizer shifting of manual transmission, wet clutch shifting can realize smooth shifting operation, ensuring uninterrupted power and smooth shifting during shifting. The shifting feeling is basically the same as that of traditional planetary gear automatic The gearbox is not much different.

In terms of basic structure, this 4-speed automatic transmission adopts the form of 3-shaft arrangement, namely the input shaft, the second shaft and the intermediate shaft, the 3rd and 4th gear clutches are arranged on the input shaft, and the 1st and 2nd gear clutches are arranged on the On the second shaft, the forward gear/reverse gear mechanism and the one-way clutch are arranged on the intermediate shaft.

The reverse gear is switched through gear sleeves, and the other 4 forward gears are switched with 4 wet clutches respectively.

Similar to the planetary gear 4-speed automatic transmission, the switching between 1-2 gears is also completed through the one-way clutch. When the 2nd gear is shifted, the 2nd gear clutch is directly controlled, and the 1st gear is automatically disengaged due to the overrunning speed of the one-way clutch. Open, this simplifies the control of 1-2 switching and ensures the smoothness of the shifting process...

According to my calculations, this parallel shaft automatic transmission can be easily upgraded to a five-speed automatic or a six-speed automatic in the future, which is enough to ensure its competitiveness for a long time in the future. In addition, the biggest advantage of this automatic transmission is that Let our country avoid the barriers of the traditional planetary gear automatic transmission patent wall, allow us to produce automatic transmissions with our own intellectual property rights, and enhance our country's competitiveness in the automotive industry..."

Professor Xu nodded repeatedly, but when he heard the back, he suddenly interrupted Zhang Qihang: "Wait a minute, have you applied for a patent for this parallel-axis automatic transmission?"

(End of this chapter)