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In 2000 B.C., there were original vehicles in China. They were wooden boards, wooden boards and heavy objects. In front of them, people or horses were used to move heavy objects. Another person kept putting logs on the ground. This was the most original wooden wheel transportation. Through this transportation, people found that the bigger the logs, the faster they traveled, and then gradually increased the diameter of the logs. Then it evolved into a wheel.
But the earliest car is a circular board as a walking component, very simple, that is, a wooden stick placed in the hole of the circular board, to the Xia Dynasty, began to appear spoked wheels, wheels naturally have bearings, and bearings are made of wood, to the Zhou Dynasty, people also know that grease is used as a bearing lubricant.
Therefore, with the passage of time, the ancient vehicles are also changing, and the bearing materials are also changing.
A wooden pottery wheel pedestal was unearthed at the cultural site of the Crossing Lake Bridge. The wooden pottery wheel pedestal looks like a bell, but the highest part has a small raised cylinder. This is the bearing used to rotate. People put a turntable on the small raised cylinder to rotate. This is the original bearing.
Not all wood bearings made of wood can be used as materials. Most of the wood used in carriages is made of wood material of "promoting elm tree". This wood is produced in Northeast China. It is hard and excellent wood bearing material.
Secondly, there are bearings made of clams. Today, clams are the second-class protected plants of the country and good materials for cutting boards. But in ancient times, they are good materials for bearings. Their advantages are non-bending, non-cracking, water resistance and corrosion resistance, as hard as steel.
(Wooden pottery wheel base)
From the unearthed metal bearing bushes of Han Dynasty, it can be seen that the bearing has been improved to some extent. This is the most original sliding bearing. There are also sliding bearings composed of wood and metal. This greatly reduces the friction between the wheel and the axle, improves the rotation speed, and prolongs the life of the wheel.
(Han Dynasty metal bearing)
In the Yuan Dynasty, "roller bearing" appeared, which was installed on the "turbidity instrument" invented by the scientist Guo Shoujing. Its main purpose was to reduce friction resistance. It can be said that it was the most original rolling bearing, but it was not used in ancient vehicles at that time.
In addition to bearings made of wood and iron, there are also bearings made of bronze, and the initial production of vehicle bearings is relatively simple. First, the axle crosses the public opinion, connecting the round holes in the center of the wheel. The wheel makes the wood soft by steam, and installs spokes to enhance the firmness. Two wheel frames are connected with a vertical shaft in the middle, and a steering device is installed.
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