Why are the wheels of a bicycle round, and why are the axles placed in the middle

The wheels of the bicycle are round, which reduces the friction between the wheels and the ground (turning from sliding to rolling).

The axle of the bicycle wheel is in the middle because the wheel is round, and the principle of lever can be used to make the pedaling force smaller.

If you make the wheel flat or square, the wheel will rotate due to the resistance to the earth.

If the axle is not placed in the middle, you will feel bumpy and unstable during the ride.

The circle is an ideal shape, if it is made into a square, the friction is large, it is more laborious to ride, and it is uncomfortable, why is the shaft placed in the middle, I agree with the statement that the upper floor.

The shaft actually passes through the center of the circle, and the radius of the circle is all equal.

In this way, the distance between the axle and the ground of the wheel does not change during the rolling, and the car will be stable, otherwise you can try it with other shapes.

Because the basketball is round, the earth is round, the fish ball is round, and your head is round.

Use the inductive method to prove that the wheel is round.

Because there is a shaft in the middle of the head, it is crooked and does not rotate, so it should be placed in the middle.

If the square can be rolled, if the center is not in the middle you can be comfortable!

That kind of bicycle will have it, but unfortunately nature doesn't think so!

This is the result of the practical verification of our ancestors. If in doubt, you can change the wheel to any shape other than a round shape and try it yourself. Honestly, you.

I believe that the wheels are all round, and the axles should be placed in the middle

You'll find out if you go for a lap yourself.

The axles of the front and rear wheels of the bicycle are mandrels.

The front axle of the bicycle only bears the bending moment and does not rotate, so it is a fixed mandrel, the center axle bears both torque and bending moment, so it is a rotating shaft, and the rear axle only bears the bending moment and does not rotate, so it is also a fixed mandrel.

Bicycles, also known as bicycles or bicycles, are usually small land vehicles with two wheels. After people ride on the car, they are powered by pedals, which is a green and environmentally friendly means of transportation. In Chinese mainland, Taiwan, Singapore, it is usually called "bicycle" or "bicycle"; In Hong Kong and Macau, it is usually called "bicycle"; In Japan, it is called a "self-mounted car".

There are many types of bicycles, including single-person bicycles, tandem bicycles, and multi-person bicycles.

It can be used as an environmentally friendly means of transportation to travel and change to travel; More and more people use the hidden bicycle as fitness equipment for cycling exercise and bicycle travel; Cycling itself is also a competitive sport, there are road cycling, mountain biking, track cycling, stunt cycling, etc. Late sentencing.

The bottom bracket of a bicycle is the rotating shaft because it is subject to both bending moment and torque. The rear axle of the bicycle is a mandrel, because it is only subject to bending moments.

Bicycles have a front axle, a middle axle and a rear axle, the front and rear axles belong to the mandrel, and the center axle is the rotating shaft.

Steel balls are installed on the front axle, middle axle, rear axle, handlebar rotation, pedal rotation and other places of the bicycle. Rolling instead of sliding can greatly reduce friction, so to install steel balls where the bike turns, we can often add lubrication so that the contact surfaces move away from each other, so that the friction becomes smaller.

Because the circle does work at the same distance during the rolling process.

At most, with the least resistance. So the wheels of the bicycle, the car are round.

It can be analyzed from the following aspects:

1) Do work: If the wheels are not round, then what are the consequences. For example, if the wheels are 4 squares, if the car can move, then the car must do two jobs, that is, touch the quadrilateral.

At each angle (4 points), the car should resist gravity, lift the car upward, do work upward, and also do displacement work, the whole car will go forward from high or low, if the car is walking on a horizontal plane, the trajectory of the car will not be a horizontal line. Such a car is not only a serious waste of fuel, but also very uncomfortable for the people sitting in the car.

2) History: The history of wheels has been around for a long time, from animals (horses, cows, etc.) pulling carts and rickshaws to current trains and automobiles. For example, if a car with power (steam, gasoline, solar, nuclear, etc.) could pull square wheels, then our ancestors were not so lucky, because if square wheels were used, the people or animals would be very tired, and they would have to carry the car all the way around at a slow speed in order to counteract gravity.

3) Resistance: We can often see that the stones in the creek are oval or round. Why is this so?

Because in the long-term river erosion process and when the stone moves in the water, when it is resisted, the edge is polished to be very smooth and round, so that the resistance will be further reduced in the process of movement in the future, and the damage to the stone will be reduced.

4): Let's take a ruler and measure the distance from any point in the circumference to the center of the circle, they are all equal. This equal distance is called the radius. This is the importance of the circle.

5): If the wheel is made round and the axle is installed in the center of the circle, when the wheel rolls on the ground, the distance between the axle and the ground is always equal to the radius of the wheel. Therefore, the carriage mounted on the axle, and the people sitting in the carriage, will be smoothly pulled by the car.

6): The wheels are round, of course, there are other reasons, for example: when something rolls on the ground, it is much less laborious than dragging on the ground, because the rolling friction resistance is smaller than the sliding friction resistance.

The formula for the distance traveled by the bicycle in one lap: distance = wheel circumference (number of teeth at the front and teeth at the rear). The main thing is to calculate the number of teeth of the big gear is several times that of the number of teeth of the back pinion, that is to say, the big gear turns a turn, and the small gear has to turn "n" turns.

Because the wheels are synchronized with the pinions, the number of turns the pinion turns is the number of turns the wheels make. That is, to find the "n" of the talent. Then calculate the circumference of the wheel "s".

The bicycle uses the principles of simple machinery such as axles, oblique bases, levers, etc

Among the 25 components of the bicycle, such as the frame, tires, pedals, travel brakes, and chains, the basic components are indispensable. Among them, the frame is the skeleton of the bicycle, and it carries the most weight of people and cargo. According to the working characteristics of each component, it can be roughly divided into guide system, drive system and braking system

1. Guidance system: composed of handlebar, front fork, front axle, front wheel and other components. The rider can change the direction of travel and maintain body balance by manipulating the handlebars.

2. Drive (transmission or walking) system: composed of pedals, bottom bracket, crankset, crank, chain, flywheel, rear axle, rear wheel and other components. The pedaling force of the human foot is transmitted by the pedal through the crank, sprocket, chain, flywheel, rear axle and other components, so that the bicycle continues to move forward.

3. Braking system: It is composed of brake parts, and the rider can control the brake at any time to slow down and stop the bicycle to ensure driving safety.

1. The wheel is round: it can ensure the stability of its movement track. If it is square, triangular, or other polygonal, or even oval, it will be high and low when it moves, and the car will not be stable.

2. Axle: installed in the center of the circle. If it is not in the center of the circle, then its trajectory becomes no longer circular.

3. The wheel is a rotating component that bears the load between the tire and the axle, and is usually composed of two main components: the rim and the spoke. The rim is the part that mounts and supports the tire on the wheel, and the spokes are the supporting part on the wheel that is between the axle and the rim. In addition to the above-mentioned parts, the wheel sometimes contains a hub.

4. Classification, according to the structure of the spokes: the wheels can be divided into spoked plate wheels and spoked hail old-fashioned wheels. By wheel material:

It can be divided into steel, aluminum alloy, magnesium alloy and other wheels. One or two tires are installed at one end of the axle: they can be divided into single and double wheels.