Great warships

Chapter 929
"You, the leader, have to swipe your card too?"

"Yes, I have to swipe my card too." Cong Ju said, "Boss Qin, I'll treat you guys to dinner."

Qin Tao looked at Alexeyeva and the others again. They were also cooking, and the meal cards they used were different from those in Cong Ju's hand.

"Outsiders use temporary meal cards for meals. We do this to avoid outsiders coming to eat. After all, our canteen is not for profit, and even needs subsidies. If outsiders know that our place is cheap, they will swarm here. Yes, that's not appropriate."

It's like the ten-yuan tube of later generations. It was originally intended to meet the needs of migrant workers. Unexpectedly, a large number of people came to take advantage of it, and some even packed meals for more than a dozen people to take away. Human nature is like this.

Alexeyeva and the others use this place as a test site, but they are not people from the shipyard, they are from the fourth design department, of course they have to spend money on food, and there is no subsidy of 300 yuan, brothers Still have to settle accounts.

"Well, yes, your method is very good, and it will be extended to the entire group in the future!" Qin Tao said affirmatively: "When the group holds a summary meeting at the end of the year, you should make this report."

Cong Ju was a little surprised: "Boss Qin, is such a trivial matter still used as a report?"

"Of course, a report must be made." Qin Tao said: "The scale of our group is getting bigger and bigger, and there will always be people who want to eat from the big pot. This will eat us up sooner or later. We really need to improve."

If the group does not improve, there will be no development and progress, which is necessary.

"it is good."

After the meal was ready, several people sat together with a plate. Qin Tao saw that his wife only made a portion of scrambled eggs with tomatoes, and shook his head: "Xiao Ling, why do you only eat this, and you are afraid that you will give Sister Cong Ju a bite?" Are you poor? Come, eat this chicken drumstick."

Qin Tao put the chicken legs on Zhao Ling's dinner plate.

Zhao Ling looked at the chicken leg, and then put the chicken leg on Alexeyeva's plate: "Alekseeva, you are the leader of our fourth design department, and the general manager of our ground-effect aircraft. You have to take care of yourself and eat a chicken leg to make up for it."

Only then did Qin Tao notice that there was only a plate of shredded potatoes on Alexieva's plate.

Cong Ju was also a little embarrassed, was she being too harsh?Do you want to provide a monthly subsidy of 300 yuan to the guests of these brother units?

Cong Ju is usually busy, so she hasn't had much dinner with Alexeyeva and the others. I don't know that Alexeyeva is so simple, did she spend all her money on research and development?Have to save on food?

Alexeyeva realized that everyone was looking at her, and then she reacted: "Our living expenses are enough. You can eat whatever you want here. I like to eat shredded potatoes. Over there, potatoes can only be boiled." As a staple food, I didn’t expect that potatoes can also be eaten as a dish in the East. I have a special liking for shredded potatoes. I came to the canteen early today. The shredded potatoes have just been made and they taste the best, so I ordered them. A big portion of shredded potatoes.”

After finishing speaking, she felt that it was not enough, and continued: "We have a good life here. The shipyard has provided us with good accommodation conditions, and we can eat such cheap and delicious meals. We are grateful to the shipyard."

She was afraid that Mr. Qin would misunderstand. What if Mr. Qin got it wrong?I also became deliberate, deliberately pretending to be poor in front of President Qin, and shabby Cong Ju by the way, this is absolutely not acceptable, I have no such intention.

"Well, I see, you can eat this chicken leg." Qin Tao said.

Without hesitation, Alexieva grabbed the chicken leg with her hand and took a bite: "It's delicious, not bad! I've been in the East for many years, and I'm most satisfied with the food in the East!"

Anyone who comes to the East will love the food of the East, even after eating for several years, they will never get tired of it.

After eating, everyone left the shipyard in the afternoon, entered Huating along the bridge across the river, and came to Golden Sun Company.

Ma Ming and others are still participating in sea trials on the aircraft carrier. Although they have conducted many complete experiments on land, they still have to go through some tests on the aircraft carrier. If they encounter problems, they can easily eliminate them immediately.

The person who received Qin Tao was Zhao Gang, the engineer who stayed here. After hearing Qin Tao's request, he immediately introduced him.

"If you want to drive a ducted propeller, it's best to use a high-speed motor." Zhao Gang said: "At present, the motors used in our electric vehicles have achieved a performance of 7 rpm, which is the main factor limiting the speed of the motor. We are still developing a brand new rotor. The goal of our efforts is to make the motor speed reach [-] revolutions per minute, and the power density can also reach [-] kilowatts per kilogram. Such a [-] kilowatt motor only weighs [-] kilograms. weight."

Qin Tao's eyes widened in surprise: "What did you say? One hundred thousand revolutions? How is this possible?"

The maximum speed of the electric motor is more than 1 revolutions. Therefore, in the car modification industry, the electric turbine will be considered as an IQ tax. Some people decide to add a turbo to their car in order to increase power. If the exhaust gas turbocharger is not possible, then To build an electric turbine, there are a lot of them on Taobao, claiming how much horsepower can be increased, etc., and also provide a package of projects such as brushing the ECU.

But in reality, adding this electric turbo does nothing but psychological comfort.

The electric motor is limited by its own characteristics, the maximum speed is 10,000 rpm, and the supercharger needs to have a speed of [-] to [-] or even [-]+ rpm to blow in enough air. In fact, when the engine is running at high speed stage, the electric turbine will also have a reverse effect, which will hinder the operation of the engine. The reason is simple: it does not rotate fast enough, so that when the engine takes in air, it will accelerate with the electric turbine, which is equivalent to the engine pushing the turbine to rotate. Instead of the turbo blowing the engine.

How do luxury cars use electric turbos?The answer is that people use twin turbos to reduce the delay of turbo intervention, use electric turbos at low speeds, and use exhaust gas boosting at high speeds.

This is determined by the basic characteristics of the motor, or the DC motor can turn so fast. If it is an AC motor, the speed depends on the frequency of the AC and the number of windings. It is a fixed number. If 50 Hz AC is used in China, the maximum speed is [-] revolutions per minute.

Now, hearing the number of [-] revolutions, how could Qin Tao not be shocked.

"If we want to improve the performance of electric vehicles, we can only find a way in this aspect. We need to reduce the weight of the motor, improve the performance, and thus increase the battery life. Moreover, the future of the development of electric vehicles is the hub motor, and our weight is naturally The lower the better."

Traditional electric car manufacturers just know how to stack batteries, and they need a battery life of [-] kilometers?Okay, add a battery, and you want a [-]-kilometer battery life?Ok, continue to add batteries, after all, it's easy!However, if it increases to a certain extent, the weight of the battery will offset the increase in power consumption, the battery life will remain the same, and the car will be heavier.

Another aspect is to improve the technology. On the one hand, the energy density of the battery is doubled, and the battery life is doubled when the weight remains the same. On the other hand, the performance of the motor is improved.

The motor also has weight. Reducing this weight can also improve battery life. When it is reduced to a certain level, it can be stuffed into the hub!

When electric bicycles first appeared, they also used an electric motor to drive the chain through the reduction gear, and then drive the wheels. But after a certain level of development, they were integrated into the hub, which is the simplest and most convenient.

What about cars?
Cars still use the way that the motor is transmitted to the hub through the reduction gear, the output drive shaft, which is also helpless, because the performance required by electric vehicles is stronger, so the motor is very large. Greatly increased unsprung mass.

The tire and the car body are softly connected, and there are various buffer systems in the middle. When the wheel bumps, the buffer system will play a role. Whether it is the simplest leaf spring or the tall air suspension, it is hoped that the mass of the wheel will be smaller. , which reduces the burden on buffering.

Therefore, if you want to plug the motor of an electric car into the wheel, you have to reduce the weight. Increasing the speed is a significant way to reduce weight. This is the same as a tank engine. If you want to increase power, you need to increase the speed.

Qin Tao's eyes lit up when he heard it.

"For electric vehicles, at least two in-wheel motors are needed, each with 70 kilowatts, which is 140 kilowatts. The power is enough for high-performance cars. For ordinary family cars, the power can be halved, so that the hub only needs to be increased It only needs to weigh five kilograms, and this weight is nothing compared to the wheels." Zhao Gang continued to introduce.

"Great job you guys! How did you achieve this performance?"

"Our current electric vehicles use permanent magnet synchronous motors. The rotors of this motor are made of strong magnetic materials. This material has low mechanical strength and will disintegrate when it rotates too fast. Therefore, we have studied a new The material improves the mechanical strength of the rotor so that it will not disintegrate at [-] revolutions. At the same time, we also use the suspension bearing of the aero-engine to meet the needs of high speed."

Speaking of these, Zhao Gang was eloquent.

"That is to say, in terms of electric vehicles, we are developing in the direction of reducing weight, increasing speed, and using hub motors?" Qin Tao asked.

"This is just one of the technical routes." Zhao Gang said: "We have another technical route. You have already proposed that a large number of electric vehicles are needed in foreign mines. Therefore, we have also created a special vehicle for heavy trucks and Large automotive motors used by other vehicles."

Heavy Truck?

Now Qin Tao was even more shocked. Yes, he did mention it, but he forgot it after he mentioned it. How could he have thought that research has already started here!

"Is there any result already? Can I go and have a look?" Qin Tao had long forgotten the purpose of coming here. Although Alexeyeva also came with him, but seeing his enthusiasm so high, Of course, he couldn't ignore his interest, so he followed Zhao Ling and others to the R&D department of Golden Sun Company.

Golden Sun's scale has long since expanded many times, and there is also a dedicated electric vehicle production plant, and the R&D department is also carrying out multiple projects at the same time, which is very lively.

In one of the workshops, a tall heavy truck appeared.

The side of the front of the car presents a diamond shape, the whole shape is angular, the windows are not very large, and the sleeper at the back is even narrower. As long as they see this kind of truck, everyone who is familiar with it will blurt out: Steyr!

Of course Qin Tao is no exception: "Did you use Steyr to improve it?"

"No, this is not Steyr, this is our Oron." A technician who was busy on the car said.

Oron?This is clearly Steyr.

The technician jumped down: "In the past, we did produce Steyr trucks, but after 2000, we only produced Aolong, but we can be sure that only our Shaanxi Automobile is the most authentic. .”

Qin Tao reacted: "Separated?"

This is a touching history.

In the 80s, in order to change the history of the lack of heavy trucks in China, China began to go abroad to investigate. The first thing I saw was Mercedes-Benz. Unfortunately, Mercedes-Benz is not a bird in the east. So I found the little-known Steyr. Facts have proved that this is very pragmatic. , Since then, Steyr trucks have taken root and sprouted in the East, bearing fruitful results.

After the introduction at that time, it was originally planned to form Sanqi, but it was not implemented later. It was distributed to the three manufacturers of Sinotruk at that time. The big guys are all brothers. Let’s work together, so a Sinotruk joint venture company was established to digest and absorb together. Steyr technology.

However, in the 90s, due to the fierce competition, the conflicts between them became more and more serious. In 2000, the three companies officially separated.

In terms of scale, the Yellow River Plant is the best, but in terms of quality, Shaanxi Automobile has never given up. Their Weichai engine, Fast gearbox, Hande axle, these technologies are combined, and they are absolutely durable. .

However, the Steyr they produced can no longer be called Steyr. This trademark was snatched by the Yellow River Factory, so they built Delong.

The car in front of me is an out-and-out Delong truck. On the front of the car, the logo of Shaanxi Auto Delong is shining.

"Yes, the Yellow River Factory has fallen out with Weichai now. We don't even have an engine. We Shaanxi Automobile are the best. Moreover, we are also looking forward. We heard that we will build electric trucks, so let's come and join in the fun. ”

It is difficult to obtain the qualifications to produce cars. It took a long time for Golden Sun to solve this problem, but it still can only produce passenger cars and cannot produce commercial vehicles.Moreover, the technology of commercial vehicles needs to be reinvented, and they do not have the strength.

Under such circumstances, joint development with domestic heavy-duty truck manufacturers became a shortcut. Shaanxi Auto was the first to find it, so it changed on the basis of Delong.

The front part of this car is still the same as before, but the original engine is removed and the engine is changed into a motor, which continues to drive the gearbox at the back and drive the transmission shaft to the rear.

When he saw these things, Qin Tao shook his head helplessly. This design is equivalent to the most primitive electric truck, oil to electricity.

"This design is too outdated." Qin Tao shook his head: "The electric motor is not big enough to occupy such a large space under the driver's cab. Moreover, a drive shaft is needed to transmit power at the back. Now this is a tractor. , the transmission shaft is not very long, if it is an ordinary truck, the transmission shaft is very long, which will inevitably cause power loss."

"Yes, Mr. Qin, this is indeed a problem, but we don't have the energy to develop hub motors now, so we can't rush, we have to take our time." Zhao Gang said.

"Electric heavy trucks do need a gearbox, but they don't need the multi-gear gearbox in the era of fuel vehicles. Four gears are enough. After all, the speed of our electric motor is very wide, and we can also engage in electronic control systems. , that is, the automatic transmission, without manual operation by the driver, otherwise the training will be too difficult.”

Heavy trucks in this era have at least a 9-speed gearbox, and most of them have 12 or even 16 gears. After all, the engine speed is two to three thousand revolutions, and the economic speed range is several hundred revolutions, so a multi-speed gearbox is required. Let the engine work in the best economic zone all the time.

However, the electric motor is not needed. This thing can turn tens of thousands of times at every turn. Cars don’t need a gearbox at all. Heavy trucks can start with heavy loads. A gearbox can be added, but four gears are enough. Without so many gears, it is pure waste.

"Then, the electric motor and gearbox can be integrated on the axle." Qin Tao said: "It is the most suitable to engage in an integrated power system."

The Shaanxi Automobile technician who just refuted Qin Tao also opened his eyes wide: "Yes, if it is integrated, it will be much more convenient, and you only need to add one type of gear oil! Your suggestion is very good , do you have any suggestions for other aspects?"

Qin Tao looked at the welded iron frame behind the cab: "Are you planning to put the battery pack behind the cab?"

"Yes."

"This is inappropriate. I suggest placing it on the chassis, where the fuel tank is, or even where the original engine is. This way, in the event of an accident, the cab can be moved backward as a whole."

Once an accident happens to a heavy-duty truck, it is very scary. Therefore, a unique skill has been practiced: the overall movement is backward, and the cab is suspended at two or four points. The safety of the occupants in the cab is guaranteed.

But in the era of natural gas vehicles, a gas tank was added at the back, and this life-saving method was no longer needed. Later, electric vehicles also did the same, and it was even more useless.

It is more appropriate to put it on the chassis. In this way, it becomes a special electric truck layout instead of the original oil-to-electricity change.

"Mr. Qin, what you said requires special research and development. We simply don't have time. Now we plan to export electric heavy trucks to relevant customers within a year. How can we develop these in time?"

"Export?" Qin Tao nodded immediately: "It doesn't matter if you export, it must be good for your own use!"

(End of this chapter)