If time passes for another ten years, or even twenty years, the electric technology may really mature. After all, after 2010, the wave of electric vehicles began to rise and fall. Not only did the cars that people were riding adopt electric technology, but even buses and load-carrier cars began to use electric vehicle technology. Under the basis of this technology, there is no problem in making the trailer part of a heavy semi-trailer into electric auxiliary power.
By then, hybrid vehicles will already appear. The front wheels use car engines and the rear wheels use electric propulsion. When necessary, switch to four-wheel drive. All cars can be played like this, and trailers can be used. Anything can be built as long as you need it.
But it doesn't work now. Now, the technology of electric vehicles is still very backward.
If you just talk about electric drive, it is necessary to drive the wheels to run. This motor is different from an ordinary motor. Ordinary motors drive mechanical equipment. After starting, as long as they can run normally, it is fine. Electric vehicles are different. They need to start and stop frequently, accelerate or climb up, so they must have a large starting torque, good starting performance and good acceleration performance. When the load changes, the motor needs to quickly adjust the output power and speed, that is, it must have a large range of speed regulation capabilities. At low speed, the torque must be large to facilitate speed increase, and at high speed, the power must be large, and the ability to increase the speed is high.
In this era, electric motors that satisfy electric vehicles have not yet appeared. Only ordinary motors are used instead. Then, there is no benefit except to continue to increase the complexity of the vehicle. Therefore, it is difficult to achieve only the electric drive behind it.
Hearing this, Liu Qianjin was in trouble again. He couldn't just use a small engine or an electric motor. So, is there any solution?
This is not their fantasy, but a demand put forward by the troops. If the ballistic missile is dragged on the road, it is too restricted. Sometimes, it is necessary to pass through some dirt roads, not to mention off-road, dirt roads must be able to pass through, right? If the rear wheels of semi-trailers have power, they can drive better on complex roads. However, now it seems that it is too presumptuous and there are many problems facing them.
"If you don't say anything else, you just need to calculate the power." Qin Zhenhua said: "Even if the rear wheel is powered by ten kilowatts, it needs to have a high voltage of hundreds of volts. Otherwise, the cable will be too thick and the loss will be too large."
The voltage of an electric vehicle is often hundreds of volts, and there is no way to do so. After all, the current can be reduced when the voltage is high. Otherwise, the high current will be even more dangerous because the current will cause more heat.
"Director Qin, you must have a solution, right?" Liu Qianjin scratched his head: "If there is any solution, let's tell us."
"Director Liu, you can definitely think of it. If you can't use electric drives, then, don't you understand what else can you use?"
"Hydraulic drive?" Liu Qianjin suddenly thought of something and said loudly: "Yes, hydraulic drive! We can install a hydraulic drive motor in the back to provide additional power to the wheels behind!"
Hydraulic motors are machines that use high-pressure liquids to work. The energy stored in the liquid pressure will be converted into mechanical energy. This liquid is a medium that transmits force and movement. Therefore, it is also called an oil motor. It has a wide range of heroes in many industrial fields, such as engineering machinery, construction machinery, coal mining machinery, mining machinery, metallurgy machinery, ship machinery, etc.
High-pressure liquid stores huge energy, and the energy conversion is quite convenient. The structure of the hydraulic motor is also very simple, small in size and light in weight. It is simply the best choice for rear-wheel drive of trailers.
Moreover, their traction heads are traction ballistic missiles, and the missiles need to be vertically launched before they can be launched. These are all hydraulics for work. Therefore, the engine of their traction heads drives a high-power hydraulic pump. The power provided by this hydraulic pump can be used for the hydraulic motors behind it. It is simply killing two birds with one stone. There is no need to modify the engine! In fact, many engineering machinery brings a set of hydraulic pumps to power certain special equipment.
"That's right, it's the hydraulic motor. Although it cannot be synchronized with the front wheel, I think it will definitely be an extremely complicated situation if it is needed. As long as we can provide it with torque and enable it to rotate actively, it will be very good. Moreover, it can completely control the power output through the height of the oil pressure, and it is not difficult to synchronize."
Qin Zhenhua has already started to introduce it incessantly.
It is not easy to find a motor used in a truck, but if you want to find a hydraulic motor used in a truck, it is easy to find a lot of hydraulic motors used in the truck. You can find a variety of hydraulic motors to match and choose the most suitable one.
(No one knows whether this four-axle trailer has a hydraulic drive mechanism. Some information says there is, and some information does not. East China Hero will treat it as if it is. If anyone knows the details and does not involve any confidentiality, you can give East China Hero a popular science.)
"Also, this trailer not only needs to have power, but also the ability to follow-up steering. I think that in many cases, this follow-up steering ability is more important." Qin Zhenhua continued: "We can install a hydraulic system behind and we can also make a follow-up steering system."
In ordinary trailers, the suspension angle of the rear wheel will not change. In this way, when the car turns, it depends entirely on the front of the car. In this case, the turning radius is very large. If the rear wheel can also turn, the turning radius can be greatly reduced. For this extended model trailer, the ability to follow the steering is also very important.
If the wheels want to be able to turn, of course, there must be a steering machine. With hydraulic equipment, the steering machine can be operated using hydraulics.
After hearing Qin Zhenhua's suggestion, Liu Qianjin nodded repeatedly: "Yes, yes, Director Qin, you are right. We can make the rear wheels into a follow-up steering, so that the turning radius will be reduced. The troops have to take some mountain roads and pass them at once! Such improvements will definitely like the troops."