Wheel Development And Evolution

People first invented a kind of "pry", which is characterized by sliding on the ground with the help of a sliding rod. At that time, it was still very difficult to drag this kind of sled on a wasteland mountain with almost no roads. One day, there was a strong wind, and someone found that under the wind, smooth stones or logs rolled faster than other things. This natural phenomenon gives people a lot of inspiration. People cut the logs with a stone axe, and cut a hole in the middle of the logs at both ends, and then put a thinner stick in the hole to cut them. connect them. In this way, a roller sled was successfully manufactured, and it was much lighter to drag things with it than the past light sled. This kind of roller appeared around 2000 BC. When this type of roller is used to transport heavy items, it will be fractured. Therefore, later people thought of this type of wheel with copper hoops or iron hoops. According to legend, around 3000 BC, wheeled carts were used in Central Asia, but at that time the civilization of Egypt did not know that it still used rolling logs as wheels to haul goods. In 1600 BC, Hexor in the north The Sri Lankans used horse-drawn chariots to attack Egypt and surprised the Egyptians. Since then, the Egyptians have also begun to use wheeled cars. And first used spokes and rims to reinforce the wheels. However, they were all made of wood at the time. Later, with the advent of steel, wooden wheels were developed into steel wheels. Rubber tires were added, and the wheels were filled with air. The wheels became more and more perfect.