"Increase the diameter of the wheel?"

As soon as Zhou Jingming said this, Hu Yulou and others were stunned at the time, and they did it for a long time, this is Zhou Jingming's solution?

Isn't that a little too simple?

"Comrade Xiao Zhou, you said that the temporary measure to solve the lack of vehicle passability is to simply increase the diameter of the wheels, is there any theoretical basis?" Hu Yulou asked curiously. Judging from his knowledge reserves, it is not clear that the specific relationship between passability and wheel diameter is not clear.

If it's okay to increase the diameter of the wheel, why not increase the width of the wheel, isn't it the same thing?

Zhou Jingming smiled, then picked up the scratch paper full of the calculation process in his hand and said, "The passability design of the vehicle has a lot of theoretical basis. ”

"And what is your result?" Hu Yulou asked as he stared at him.

"There are two indicators of passability, one is the support through nature, the other is the geometric passability, the design parameters of the support through the performance are fully meet the requirements of the march, whether it is the traction force coefficient, or the traction efficiency, can reach a very high level, the problem lies in the geometric passability. ”

As he spoke, Zhou Jingming turned the paper to the second page, "According to the phenomenon described by the PLA comrade just now, the lack of passability of military vehicles in mountainous road conditions is caused by jacking failure, and from the analysis of the traction hook force of the vehicle, the shear stress and shear deformation of the ground soil ......."

Next, Zhou Jingming explained in detail from the perspective of automobile theory why increasing the diameter of the wheels can improve the passability of the vehicle.

“…… It can be seen from this formula that increasing the diameter of the wheel is more conducive to reducing the compaction resistance than increasing the width of the wheel, and the reduction of the compaction resistance will greatly improve the passability of the vehicle. Zhou Jingming pointed to a formula that looked very complicated and said.

Hu Yulou suddenly, Zhou Jingming's answer explained why it was the reason for increasing the diameter of the wheel instead of increasing the width of the tire, the logic was clear, the reasoning was thorough, and there was no flaw!

Thinking of this, Hu Yulou couldn't help but glance at Zhou Jingming more.

"What you said is just a general explanation of how to increase the passability of the car, and how to prove that it also has a role in reducing the failure of the vehicle's jacking?" Hu Yulou continued.

"Look at this again. Zhou Jingming smiled, as if he had expected Hu Yulou to ask this question, "The jacking failure of the vehicle and the failure of the contact are all extreme conditions with obstacles. The reason why this military vehicle cannot pass in mountainous road conditions is because the road conditions on the border have exceeded the limits of the vehicle design. ”

As he spoke, Zhou Jingming symbolically drew a sketch on the paper, "This represents the diameter of the wheel, and this represents the diameter of the ground gap, which can be understood as the scene of the vehicle passing through the high ground.

Zheng Tongya thought about it, and then told Zhou Jingming the approximate number, although he didn't understand what Zhou Jingming said, he just felt that it was very powerful.

I don't know how to do it!

“…… After a series of calculations, it can be seen that the condition for jacking failure is this, and the wheelbase of the vehicle, the diameter of the wheel has a close relationship, substituting the relevant data, it can be obtained, with the current parameters of the car, there is no way to complete the task of passing through such a high slope, and the wheelbase these conditions, can not be changed in a short time, the only thing that can be changed is the diameter of the wheel. ”

Of course, intuitively speaking, the increase in the diameter of the wheel can indeed improve the ground clearance to a certain extent, but it does not mean that the increase in the diameter of the wheel, the ground clearance will necessarily increase, all of which need to be supported by theory.

Hu Yulou fell into contemplation again, he probably understood the reasoning process that Zhou Jingming just gave, it really makes sense, and it is not difficult to implement, after all, compared to the wheelbase of the frame, the tires of the wheels can be customized.

This, as a temporary measure, is indeed very simple!

"Then why don't you just try it with a bigger wheel according to what this comrade said, if it works, then follow this plan first, and then find another way?" Zheng Tongya looked at Hu Yulou and asked.

"Okay, then let's give it a try!" Hu Yulou immediately nodded and said, "Comrade Xiao Zhou, please give a specific wheel diameter parameter, and I will have people build it overnight tonight." ”

"Based on these two data, four pairs of tires and wheels were built. Zhou Jingming quickly gave the data to Hu Yulou.

On the side of the second automobile, there is a complete set of parts suppliers, Hu Yulou quickly arranged this task, and gave a dead order, before tomorrow night, we must take the things that meet the requirements, there is no suitable mold, even if you beat it by hand, you have to make it!

In the evening, Hu Yulou entertained Zhou Jingming and Zheng Tongya and others in the guest house of the factory, and Hu Yulou also gave high praise to Zhou Jingming's performance today, and he could give such a meticulous theoretical deduction in a short period of time, which is indeed not something that ordinary people can do.

After a beautiful sleep, the next morning, just after a few people finished lunch, Hu Yulou's secretary came to inform them that the wheels and tires were ready!

Because of the urgency of the situation, Hu Yulou did not dare to delay, and immediately took Zheng Tongya and others to the playground, and instructed the workers to replace the wheels of the Dongfeng iron armor.

"Find a place with terrain similar to the Sino-Vietnamese border and do an experiment. After the wheels were changed, Zhou Jingming said.

"This kind of place is easy to find, and the most important thing in Shiyan is the mountains. Hu Yulou replied with a smile.

After the group got into the car, the car was quickly driven to a mountainous area not far from the second automobile, and after getting out of the car, Hu Yulou asked Zheng Tongya, "Comrade Zheng, is the terrain here very different from what you encountered at the border?"

Zheng Tongya shook his head, "It's even more complicated than the terrain we encountered." ”

"Let's do a passing test here. With that, Zhou Jingming walked into the car again, this time the mountain experiment, on the way to come, it has been said that Zhou Jingming is responsible for driving, anyway, with his driving skills, this kind of road condition is not a problem.

"Be careful, then. Hu Yulou and the others hurriedly said.

Zhou Jingming smiled, then closed the car door, and after starting the car, the car started to drive directly along the mountain, while Hu Yulou, Zheng Tongya and others looked at the car with a nervous face, and their minds were full of expectations for this experiment.

The car soon encountered the first hillside, and after Zhou Jingming switched gears, the car slowly climbed up the hillside like a creeping cheetah......

Zheng Tongya clenched his fists, when he was at the border before, the car encountered a hillside similar to this, and then the car was stuck on the top of the hillside and couldn't move, if Zhou Jingming could drive the car over smoothly this time, it would prove that the method of replacing the wheels was feasible!

Everyone stared intently at this tense and exciting moment, and as Zheng Tongya let out a cry of surprise, Zhou Jingming's car passed the top of the slope smoothly and slowly walked downstream......

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