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Why Are Bearings Considered One of the Greatest Inventions?
Bearings are fundamental components in machinery, widely applied in mechanical products across various industries and hailed as the "joints" of machines. Even the most sophisticated machinery can suffer catastrophic failure or even loss of life if a single small bearing malfunctions.
Take, for example, the main bearings in an aircraft engine: the working environment for these bearings can be aptly described as "hellish." Not only do they operate at high speeds exceeding tens of thousands of revolutions per minute for extended periods, but they also endure various forms of stress, including compression, friction, and extreme temperatures. They truly go through the wringer.
Furthermore, while some structural components with lower precision requirements can remain safe for use even with minor cracks (a concept known as damage tolerance in professional terms), this does not apply to critical transmission components like the main bearings in an aircraft engine. These bearings must never exhibit any form of damage, such as cracks, during operation, imposing extremely stringent requirements on their machining accuracy and material strength.
For these reasons, high-end bearings are hailed as the "pinnacle of mechanical engineering." The manufacturing of high-end bearings integrates cutting-edge engineering technologies of today: it involves not only a series of technical challenges related to materials, greases and lubrication, manufacturing processes, design, bearing manufacturing equipment, testing, and experimentation, but also encompasses fundamental scientific research and interdisciplinary fields such as contact mechanics, lubrication theory, tribology, fatigue and failure, heat treatment, and material microstructure. Given this comprehensive integration, the difficulty of mastering high-end bearing manufacturing is beyond the reach of less developed nations. Although there are countless types of bearings, they all adhere to the same mechanical principles and laws of mechanics. Based on the different ways force is transmitted, bearings can be classified into two main categories: sliding bearings, which rely on sliding to transmit force, and rolling bearings, which rely on rolling to transmit force.
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