I have gained knowledge, why do cars have four wheels?

I don’t know if you have paid attention, most of what we have seen so farcarAll are following a rule, with a van-shaped distribution streamlined body and four wheels. In order to comply with the aerodynamics and reasonable distribution of the body, this design can be answered. Have you ever thought about why most cars use it? FourtireWoolen cloth?

First of all, the wheel is very simple. Use this shape to move forward because the circle is made up of countless points. The friction between each point and the ground forms rolling friction, which is the least resistance of all kinds of friction. Then why is the number 4 circles?

Let's see the differencetireThe first of all vehicles is one-wheeled vehicles. Electric unicycles have appeared, but the tires are wider and the friction is greater, and the power loss must be greater. It is also difficult to install space in the car. Therefore, with the current technology, There will be no unicycles.

There are two-wheeled bicycles and motorcycles. The driving principles of these two vehicles are solved, but the power source is different, and we all know that we need to maintain a balance artificially. Although the field of vision is quite wide, the safety and driving autonomy are not high. Two-wheeled cars are also impossible.

As for the three-wheeled car, it is more interesting. The first real car invented by mankind was the carriage-type three-wheeled car invented by Karl Benz. As for why it did not develop in this style, the reason is that the driving is not stable and easy... When a car rolls over, the movement of three points on the plane is unstable. This should be distinguished from the stability of a triangle, which is connected on three sides.

Of course, there are also three-wheeled boutique cars in modern times. For example, the Campagna TREX 1400R is the most powerful three-wheeled sports car produced by Campagna so far, and it is also the fastest three-wheeled sports car in the world so far. However, the tires of this car are very wide and grounded. The area is large and it is not a scientific design.

When adding a wheel and turning into a four-wheel design, the stability problem is well solved. The vehicle’s bridge has springs, which can be leveled automatically by its own weight (just like a person can walk in potholes with both legs). The road does not let yourself fall back and forth), therefore, the four wheels are the least likely to roll over. The wider, heavier, and shorter the car body is, the less likely it is to roll over.

Moreover, the four wheels form a wide and regular plane, which can well carry the power of the car and the space required by the occupants, so it has become the mainstream.

So why are there no five-wheelers or cars with more wheels? The first is the inconvenience of handling, and the second is the problem of increased costs. Why do we need five of the things that can be solved by four wheels? As for the multiple tires and crawlers used in special vehicles, due to the high cost and use cost, they will not be included in the design of daily vehicles.

But with the development of technology, will the four-wheel design continue? Many concepts or imaginary cars have begun to ponder this matter. Among them, the most daring and attractive is the suspension car. The suspension car is not only cool, but also can greatly reduce the driving resistance. There will be a good improvement in energy consumption, but the power is provided. And the operating range of suspension still needs to be further explored.

publicThere is such a floating imaginary vehicle, but it looks more like a single-person near-ground aircraft. Perhaps in the near future, suspended vehicles will really appear.