my scientific age

Chapter 287 The power is ominous, and when it is strong, it is strong!
12 horsepower, top speed of 30 kilometers per hour, comes with a crank handle, and the rate of return is very high.

This is a myth in the field of tractors, a world-famous legend of single-cylinder machines, and Yu Hua chose to pay tribute to the past classics without hesitation.

In terms of power, the single-cylinder diesel power with 100 horsepower can amplify the torque through the transmission system, and can tow cargo boxes with a mass of several tons to tens of tons. If the horsepower reaches more than [-] horsepower, it is not a problem to pull hundreds of tons.

In a word, the power is ominous, and when it is strong, it is strong.

In terms of pulling things, the classic walking tractor can throw away all the trucks in 1937. The standard load is 750 kg.

As long as the tires and beams can hold up, no one can stop the walking tractor from moving forward.

Go up the mountain and down the ditch, pull goods and people, and traverse every corner of China.

In terms of reliability, as long as the quality passes the test, there will be no problem in using it for 20 years.

In terms of design concept, emmm... the design concept and appearance of walking tractors are at least 50 years beyond the current era.

The reason why Yu Hua chose the classic walking tractor is very simple. This thing is almost a universal artifact. In the past life, the rural county economy was driven by it. In this era, it can perfectly meet the needs of the base area for the transportation of industrial raw materials. Pull the gun to pull the material and pull people, and the application environment is directly full.

On top of that, it's so simple, it's ridiculously low-tech.

There are only two core components, a single-cylinder diesel engine and a transmission system, with a front head on the top, a girder on the bottom, and a cargo box at the back.

After the conceptual drawing of the tractor was finished, Yu Hua marked the transmission system structure and various performance parameters of the tractor, and then handed it to Professor Zhuang.

"Dead weight is 1 ton, power-to-weight ratio is 12 hp per ton, 12 hp single-cylinder diesel engine is 1400 rpm/60 Nm, the first gear 300 rpm torque reaches 280 Nm, and the final drive is amplified to 7000 Nm, and the second gear 700 rpm torque 120 Nm Nm, amplified by the final drive to 3000 Nm... This drivetrain is very cleverly designed, with a total gear ratio of 25 times.”

Professor Zhuang took the design sketch and looked at the appearance of the design. His eyes were quickly attracted by the parameters and structure of the transmission system.

7000 Nm of torque is not unusual, any large tractor and car can reach this level, but the point is that this is the torque amplified by the 12-horsepower single-cylinder diesel engine through the transmission system.

A drivetrain with a total gear ratio of 25 times.

12 horsepower produces 7000 Nm of torque, which is very interesting. According to the formula, this torque is divided by the tire radius, and the total driving force of the power machinery can be obtained.

基于设计图标注的轮胎半径参数300毫米，即7000牛米÷0.3米=23333N，总驱动力为2380公斤。

It is equivalent to saying that such a 12-horse gadget can easily run with two or three tons, and walk freely with five or six tons.

Calculating the total driving force data of the classic walking tractor in his mind, Professor Zhuang clicked his tongue secretly, quite surprised in his heart. You must know that the 94 military truck of the Japanese army next door weighs about four tons, with a standard load of only 1.5 tons and a horsepower of about six. It looks like ten horses.

One is [-] pillars of five or six tons, and the other is [-] pillars and one and a half tons. Even a child can understand how big the gap is.

interesting.

Really interesting.

From a technical point of view, Zhuang Qianding has to admit that the tractor produced by Yu Hua has no design flaws. The appearance and structure are completely different from the current domestic imported Western tractors, and the load capacity and practicability are extremely high.

The horsepower is small, the torque is large, and the structure is very simple. The gears are composed of three forward gears + two reverse gears + neutral. The first gear has a maximum speed of 10 kilometers, the second gear has a maximum speed of 20 kilometers, and the third gear has a maximum speed of 30 kilometers.

Compared with the top speed, this tractor is definitely not as good as a truck. When it comes to the actual off-road speed, Zhuang Qianding feels that the off-road capability of this tractor must easily crush the Japanese Type 94 military truck.

"How did you come up with this transmission system? You have a very thorough understanding of the gear set, and the design is extremely delicate." Professor Zhuang reviewed the entire tractor design and confirmed that there were no obvious design flaws. He turned his attention to Yu Hua and said.

"Students had a sudden inspiration. Professor, what do you think of the design of this tractor? It can be used for civilian use, transport materials and personnel in wartime, and can also be used as a 105mm howitzer tractor." Yu Hua responded with a smile, seeking Zhuang Qian Ding's attitude.

With the strong torque of the classic tractor, it can easily tow a 1.8mm howitzer with a total combat weight of 105 tons, and the rear compartment can also transport artillery shells and artillery. Say, with this tractor, what special tractor is needed?

The base area has a weak industrial foundation, and the economy and resources are in short supply. There is no ammunition to engage in professional special vehicles. The walk-behind tractor is a multi-purpose and all-powerful machine, which is most suitable for the situation in the base area.

"No problem, just follow this design. You are in charge of the tractor, and I am in charge of the cement. In the past few days, I will do pre-research work first, and then write a technical report to the organization."

Professor Zhuang nodded, finalized the design plan for this tractor given by Yu Hua, and then distributed the work in an orderly manner: "I really didn't expect that in order to build a 105mm howitzer, we would not only have to engage in the steel industry and machinery manufacturing industry, but also in the steel industry and machinery manufacturing industry. Power machinery."

There is a hint of fun in the words.

Whether it is the steel industry extended by the oxygen top-blown converter project, or the machinery manufacturing industry for the manufacture of air separation plants and various machines, or the cement industry and power machinery industry, all the reasons for this all come from the original target - 105mm howitzer .

In order to build a gun, build an industrial system...

To be honest, if this situation is revealed, others will not believe it at all.

"Yes, when all this dust settles, we will be able to see the 105mm howitzer developed by ourselves entering the battlefield and bombarding the Japanese army." Yu Hua nodded, looking at northern Shaanxi, thousands of miles away, and his mind soon came to mind. The last 105mm howitzer is installed in the troops, showing the momentum and power of the god of war on the battlefield.

360° circumferential firing field, 23 times the barrel, 14 km maximum range, 105 mm caliber, with these performance data, just thinking about it is beautiful.

If hundreds of 105mm howitzers were assembled to form a heavy artillery group of the Eighth Route Army, the picture would not be too shocking.

Of course, Yu Hua knew very well that he had no chance to see the scene of the heavy artillery shelling. He should have been in the United States at that time.

The two problems of traffic and transportation have been identified as solutions. Professor Zhuang is responsible for developing a complete set of cement production processes and for the development of classic tractors.

In general, the technical difficulty of the two projects is average, and both Professor Zhuang and Yu Hua can complete them independently.

The cement production process has been developed for more than ten years since its birth to the present. The production process is very mature. The rotary kiln equipment is used to realize 24-hour uninterrupted production. The industrial raw materials are limestone, clay and coal.

As for the sudden addition of two scientific research projects, Yu Hua and Professor Zhuang said that if there are too many lice, it will not itch, and if there is too much debt, there will be no worries.

After the discussion, Professor Zhuang stayed in the mechanical engineering laboratory to write a report on the cement production process, and started the pre-research work of the cement rotary kiln production process. Yu Hua did not design a classic tractor for the time being. This Saturday, this is with Mr. Rabe. Scheduled trading hours.

He had to arrive at Mr. Rabe's residence by 10:30 p.m.

Yu Hua quickly returned to the laboratory, changed his clothes, and took advantage of the darkness to leave the school from the east gate. Following his usual behavior, he carried out anti-reconnaissance behavior and confirmed that no one was following him. Then he found a rickshaw nearby and headed straight to the city. East.

……

The night is dark, cloudy tonight, no moon.

The sea breeze is constantly blowing with a faint fishy smell, the sea is ups and downs, and there are ripples.

This is the [-]-ton freighter Giant, which has been sailing at sea for more than a month. It is loaded with German-made machine tools and equipment, which symbolizes the world's top machinery manufacturing level, and came to the destination - Tianjin Wei.

In the port area, Boll, the military attache in a suit, clasped the optical telescope in both hands, and watched the Giant, which was gradually approaching the shore, through the lens.

Soon, the giant freighter completed the entry process and docked steadily at the predetermined pier position. More than a dozen personnel belonging to the German identity quickly built the trestle.

On the giant freighter, three men in suits disembarked and went straight to the military attache Bohr.

Steady posture and fast walking.

Three young men quickly came to Boer, and then, the leading man straightened his back, raised his right arm 45 degrees, pointed his fingers together, and extended a military salute.

The rest followed, raising their right hand in the same courtesy.

The military attache, Bohr, had a serious face and raised his right hand in return.

"Mr. Military Attache, I am the commander of the escort team, Geer. The Giant has now arrived at its destination safely. According to General Guderian's order, after the escort team reaches its destination, the command has been handed over to you."

After the meeting and salute, the young man in the lead picked up the folder he was carrying and handed the cargo list to the military attaché Boll: "This is the cargo list!"

The escort team has a total strength of 60 people. Guderian deployed a reinforced platoon as a security force for the cargo, and added many automatic weapons.

"Thank you for your hard work, please arrange for unloading immediately." Military attache Bohr took the cargo list and carefully reviewed it to confirm that there was nothing missing. He was slightly excited, took a deep breath, suppressed his emotions, and issued an order.

"Yes!" Geer, the commander of the escort team, nodded, then turned to leave, and arranged for the soldiers and crew of the escort team to lift and unload the cargo.

As the largest port in the north, Tianjin Wei has a relatively complete sea port loading and unloading machinery and infrastructure, cranes, forklifts, warehouses, etc., and four [-]-ton berths.

According to the content of the transaction agreement signed with Yu Hua at the beginning, what they have to do is to send the batch of mechanical processing equipment to Tianjin Wei, and send it to the port warehouse leased in their own name, waiting for the other party to transport it.

At this point, their trading work is over.

As the wooden boxes wrapped with mechanical processing equipment were slowly transferred away from the freighter, piled up in the dock area, and then transported by forklifts to the predetermined dock warehouse, military attache Bohr looked at the decreasing number of wooden boxes on the giant freighter, his eyes full of fiery.

almost.

The moment to obtain Y-type armor steel is getting closer.

While the giant freighter was unloading, the news of the arrival of the goods also spread to Peiping and to Rabe.

……

PS: The total combat weight of the 105mm howitzer was incorrectly marked before. It was 1.8 tons, not 2.5 tons. Sorry, I only found this error today and it has been corrected.

Wait for a diagram of a tractor + 105 guns, Tsinghua Garden is coming to an end, and then go to the base.

(End of this chapter)