Although most of the cars on the market currently use automatic transmission design, the most commonly used automatic transmissions are CVT and dual-clutch.

The reason why these two transmissions are used in large quantities is because they are cheap.

However, these two transmissions also have their own disadvantages. For example, the CVT transmission has poor reliability, is prone to slipping at the start, and cannot withstand too much torque.

Moreover, if used improperly, it is easy to cause problems about 100,000 kilometers.

As for the dual-clutch transmission, let alone the low speed jam is a problem that comes from the womb.

But so many automakers, even though they know that these two transmissions are unreliable, why do they still need to use them?

It is because they are cheap, and the cost of these two transmissions is basically in the range of 2,000-4,000 yuan.

If you use an AT transmission, the cost will be about 10,000 yuan.

So now, hydraulic automatic transmissions like AT have basically become the standard equipment for high-end cars.

Only a small number of conscientious companies will equip their ordinary models with this kind of transmission.

The reason why this kind of transmission is expensive is because of two difficult technical problems.

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One is the TCU, which is the logic system that controls gear shifting. There is nothing to say about this. It requires long-term technical accumulation, understanding of various variables, and then training based on the engineer's own understanding.

In this regard, domestic car companies generally don’t have much patience to do it, and most of them are entrusted to foreign companies for training.

The only people in China who can make their own gear shifting system are BYD and FAW.

As for another difficult problem, it is the hydraulic torque converter.

This is actually a hydraulic fuel tank. When driving, the on-board computer will judge the driver's needs based on the road conditions and speed.

Then at the same time, the TCU will control the flow of liquid inside the box by controlling various passage valves in the hydraulic torque converter.

This achieves the purpose of controlling shifting and shifting through hydraulic pressure.

The principle is very simple to say. In fact, this hydraulic torque converter was first born during World War II in the last century.

It was first invented by the Americans and used on their Sherman tanks.

So many Germans like to brag that during World War II, the German Tiger tanks were invincible in combat and could beat Sherman to the point of urination.

But why did Sherman win the war later?

On the one hand, it is quantity, and on the other hand, it is mobility.

Because at that time, American tanks had already used automatic transmission, and they were automatic transmissions of four gears.

So at that time, the American tanks were better than the German tiger-style in terms of mobility and operation.

After World War II, this automatic transmission was miniaturized and used in large quantities in cars.

Later, it was the Germans and Japanese who developed this hydraulic automatic transmission.

Especially Japan's Aisin and Germany's ZF have played this hydraulic automatic transmission to the extreme.

Even now ZF's eight-speed transmission is called the best transmission in the world.

The shifting is linear, without any jerks, and it is very sensitive and very fuel-efficient.

The most important thing is reliability, which is more than several times better than dual clutch and CVT.

Some of our automobile manufacturers have also wanted to produce this type of hydraulic automatic transmission.

But after a simple attempt, all of them ended in failure without exception.

The reason for this result is that we are backward in the field of machining and we cannot produce valve bodies of hydraulic torque converters as complex as others.

Even if others open the drawings to the Internet, they will signal that we can copy them at will.

But we can't copy it out, because the pipes inside the valve body are too complicated.

Those valve bodies are completely made of hard turning and milling of two aluminum alloy ingots.

On the special metal ingot, it is processed in this way by using pipes, turning, milling, boring and grinding by machine tools, and all the processes are used.

Those pipelines are the routes for hydraulic oil to travel inside the valve body. Each route must be consistent in thickness, and the inner wall of the pipeline must be particularly smooth.

The accuracy of the valve bodies on both sides must reach 99.999%, so as to ensure that when the valve bodies on both sides are pressed together, the joints will be tightly connected and there will be no leakage.

Once liquid leakage occurs, it means that the valve body is scrapped.

And you have to know that the pipes inside the valve body are sometimes not straight, in order to achieve various goals.

Engineers will design these pipes into winding shapes, which greatly improves the difficulty of processing.

In our eyes, there are basically few machine tools in China that can process such complex cavity pipelines.

Therefore, even if people put all the drawings online, we can't create such a complicated gearbox even if we copy it.

This is the main reason why Aixin and ZF can be high on the rise and seek out our domestic car companies.

Because there are currently GM and Ford for their own use in the world, only these two companies can equip car companies with hydraulic automatic transmissions on a large scale.

If domestic car companies want to enter the high-end car field, they basically cannot avoid the threshold set by these two companies.

This is the little truth about Li Wensong, as a car enthusiast, knows about the domestic automobile industry.

At this time, I saw the "machine tool" in front of me that could not be named, and actually used this form to process and produce the valve body of the hydraulic torque converter.

This not only made him feel very eye-opener, but also felt that it was dawn.

There is such a company that I believe that the spring for domestic automobile manufacturing companies has come.

At this time, Huang Haibin beside him was staring at the device in front of him with full concentration, falling into deep thought.

The design concept of this device is actually very similar to the concept of the surgical robot he developed.

However, the surgical robot he developed mainly works on the human body.

This robot works on various iron ingot workpieces.

The main purpose of the surgical robot he developed is to treat diseases and save people, and the main purpose of this robot is obviously to process and produce various workpiece equipment.

When he was working at MIT, he had worked on five-axis linkage machine tools for a period of time.

Of course, at that time, it was mainly to process and manufacture some experimental equipment he wanted.

Because they want to engage in cutting-edge scientific research, many of the experiments of their team need to be designed by themselves.

To conduct such experiments, a lot of new test equipment is required, and this test equipment is difficult to purchase in reality.

If customized according to a special manufacturer, the cost is very high and it will be very slow.

So they use the equipment they have at hand to produce the test equipment they need.

It was from that time that Huang Haibin had full access to various machine tools and equipment.

He has used all of them from DMG in Germany to Mazak Yamazaki's top equipment.

So he knows more about machine tools than any entrepreneur who came with him today.

At this time, he saw two iron-holding and iron-blank-mounted mechanical arms on the equipment, which were like the fixtures used by ordinary machine tools.

However, unlike the fixtures used by ordinary machine tools, these two arms can be moved.

You should know that when processing and production of DMG or Mazak's machine tools, the most taboo thing is to shake the bench or fixture.

Because once the bench and fixture vibrate, it will definitely affect the vibration of the processed workpiece.

Therefore, sometimes in order to ensure processing accuracy, the installation locations of these machine tools even require special intentions to build factories.

And the bottom of these factories is not only filled with sand, but also various shock-retardant rubber.

Such foundations will absorb ground vibrations from other directions, and at the same time during equipment processing.

It can also effectively absorb the tremor force transmitted from the machine and equipment, and resolve the buffer zone below the ground. It will not be like a hard ground, and while receiving the force, it will also transfer a reaction force to the equipment back.

These seemingly inconspicuous forces may affect the accuracy of machining.

Therefore, the installation and use of a five-axis linkage machine tool is very particular.

But today he saw this device, which opened his eyes.

This ‘machine tool’ can be seen from the naked eye. There is a hard cement floor under the feet, without any buffering protection measures at all.

But when this machine tool is started, it is still as stable as an old dog, and the processing accuracy is not affected at all.

And this secret happened on the two robotic arms that act as clamps.

When the processed carving knives depict and wander on the iron blank of the workpiece they hold, the force exerted by the tool on the workpiece.

It will be transmitted to these two robotic arms through the workpiece, and these two robotic arms will actually be transmitted with the force, and from time to time, fine-tuning the angles holding the workpiece.

This is like two robotic arms that can play Tai Chi. When another brute force collides with each other, they will draw circles and directly resolve the opponent's strength.

This is simply a fantasy for Huang Haibin, who is used to the processing and production of ordinary five-axis linkage machine tools.

Because in his concept, hard links are inevitable when machine tools are processing workpieces.

Because if you don’t have to confront each other, how can the tool of the machine tool work on the workpiece and carve the shape you want?

And the machine tool in front of him completely subverted his concept of traditional machining.

Because this machine tool implements soft connections, it adopts curved surface processing and flexible processing modes.

That is to say, while the two mechanical arms as fixtures are constantly fine-tuning to resolve the huge impact force brought by the machining tool vertically and horizontally opening and closing on the workpiece.

The processed tool can also adjust the angle at any time, which can ensure that the machining is completed uninterruptedly as the adjustment of the robot arm.
Chapter completed!