Automotive Black Technology Chapter 686: ：

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Compared with a car's transmission system, a tank's transmission system is not on the same level. The technical content of this toy is much higher than that of a car's transmission system.

In the final analysis, the transmission of a car is just a change in the gear ratio to allow the drive shaft to obtain different torque and power. But the tank's transmission system is complicated, and it's not just about changing power and torque.

Cars are steered by their front wheels, but tanks are not!

The steering of the tank is carried out by utilizing the speed difference between the two tracks, so the transmission system not only assumes the responsibility of speed change, but also assumes the steering function. Without this, the entire transmission system of the tank will be complicated. .

If Li Fanyu were to start designing such a transmission system at his level, it might be difficult to reach the sky. But with the design expertise, he is completely confident!

After reviewing the information in his mind and checking the relatively advanced tank gearbox design concepts on the Internet, Li Fanyu came to the R&D center.

Here, Wang Yu is starting to conduct environmental tests on B-01. When he heard that Li Fanyu was going to develop a matching transmission system, he was a little excited. However, the temporary team formed originally has a limited number of people, and is busy with various tests, so it is temporarily unavailable.

In view of this situation, Li Fanyu discussed with the people from the Seventh Division and planned to set up a separate team, with himself taking the lead in designing and developing the transmission system.

This is also done to consider completing the entire set of solutions in the shortest possible time, so there is no reason why the Seventh Office disagrees.

When he learned that Li Fanyu was going to allocate manpower to develop key parts of the fourth-generation tank project again, Liu Qing hugged Li Fanyu's thigh without saying a word.

"Brother Fan! I beg you, let me go!"

"Get out of the way!" Li Fanyu shook his thigh and hung Liu Qing directly from the ground.

"I don't! Brother Fan, I promise not to leak the secret, give it a chance, give it a chance!"

"Pfft, cough cough...Brother Fan, look at how bad he is, he's almost going crazy these days. Qingzi's team is still good at the gearbox, so just let him do it. ”

Xu Fufang looked at this guy hanging on Li Fanyu's thigh like a monkey, suppressed his laughter, and coughed lightly to help.

Li Fanyu had no choice but to look down at the tearful guy on his lap: "Can you really guarantee that you will keep your mouth shut and not leak the secret?"

"Definitely!"

"Okay, then I'll give you a chance."

"Thank you Brother Fan for holding the grass, I love you so much!"

"Don't rush to love me first, I have to test you."

"You say!"

A smirk suddenly appeared on Li Fanyu's face, "Go downstairs to find someone from the Seventh Division and memorize the confidentiality rules for me."

Let you have a big mouth! Hehe...

"Huh?"

Liu Qing's face collapsed when he heard this was a test...

Half an hour later, a strange guy stood in the lobby on the second floor of the R&D center. As he walked towards Li Fanyu's office, he muttered something;

"Don't tell secrets that shouldn't be told. Don't ask about secrets that shouldn't be asked. Don't read secrets that shouldn't be seen. Don't keep secrets that shouldn't be kept. Don't involve secrets in private letters. Don't... in non-confidential situations Do not record secrets in non-confidential places. Do not copy, save or destroy secrets privately. Do not bring secret carriers to visit relatives, friends or travel. Hey, this seems like a bad thing..."

……

After searching for information on the Internet for a whole day, Li Fanyu already had a rough idea.

In view of the shortcomings of the mechanical transmission system originally equipped on the fourth generation tank, which was cumbersome and inflexible in operation, Li Fanyu decided to design a comprehensive transmission device that relied on hydraulic power and added a stepless steering system. In this way, in theory, the tank can have better flexibility, and the operation can also get rid of the hydraulic lever and use a more flexible steering handle or steering wheel.

With this general direction in mind, he found Liu Qing and his team to start designing together.

In just ten days, Zhengshin’s customized automatic transmission system for the fourth-generation main battle tank came out.

The new transmission system abandons the original mechanical transmission method and uses a large number of hydraulic devices. The main part is composed of a fully automatic hydraulic mechanical comprehensive transmission device and a hydraulic continuously variable transmission system.

The principle of this hydraulic power is actually not difficult;

In a pump, there are three impellers. One is connected to the engine and is responsible for outputting power, which is called a pump impeller. One connected to the output shaft is responsible for transmitting power and is called a turbine. There is another one between the two impellers that is responsible for adjusting the output, called the guide wheel.

The flywheel of the engine drives the pump wheel to rotate, pushing the pump oil to the turbine to rotate under the action of hydraulic pressure.

This is like two fans facing each other. When one fan is turned on, it will also cause the other fan to rotate. The guide wheel in the middle is used for adjustment, which can enhance or weaken the hydraulic pressure of the pump wheel and adjust the torque output.

This hydraulic torque conversion method, coupled with a planetary gear transmission, can change different transmission ratios to achieve forward and reverse.

This type of hydraulic transmission is different from mechanical transmission and requires clutch intervention to frequently change the gear ratio. The significance is that it runs smoothly without frequent shifting, has greater torque at low speeds, and is faster in reverse gear!

On this basis, Li Fanyu also designed two sets of drive systems on the fourth-generation vehicle based on the old-fashioned mechanical transmission and steering method, which caused the tank to turn around and turn around inflexibly.

This unlocks a very cool feature - center steering!

If the original mechanical transmission is used, the driver will need to pull the two joysticks back to the neutral position to brake the track on one side when the tank turns around. In this way, you can make a U-turn with one side of the track as the center, like a compass drawing a circle.

This U-turn method is not just Low. This U-turn method requires a large turning radius.

In a street battle where the terrain is narrow, or when the formation turns around and retreats, how much time does this method need to waste?

The transmission device named Longji given by Li Fanyu can transmit the engine power through the hydraulic coupling and differential device through the busbar to both sides of the track at the same time in the neutral state, so that the two The tracks rotate at the same speed and in opposite directions.

In this way, the tank can perform "0 radius" steering with the center of the vehicle body as the steering center!

This function is matched with the hydraulic transmission and B-01 engine. According to Li Fanyu's rough calculation, the fourth-generation tank can complete a U-turn in 5-7 seconds!

With these, the entire power solution is completed.

With dragon heart and dragon spine, Li Fanyu is confident that the fourth generation main battle tank will become the king of land warfare in terms of mobility!