Bearings are the "joints" and "lifelines" of transportation equipment. They support rotation, reduce friction, and directly determine the safety, efficiency, and reliability of vehicle operation. Whether it's the wheel hub of a car, the axle box of a high-speed train, or the engine of an aircraft, bearings bear critical loads and harsh operating conditions. Their performance directly affects ride smoothness, fuel economy, service life, and passenger comfort. In the development of modern transportation towards electrification, high speed, and intelligence, high-performance bearings are indispensable core components, serving as the cornerstone for ensuring transportation safety and improving technological levels.