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schaeffler bearings are bearings that operate under sliding friction. Plain bearings operate smoothly, reliably, and without noise. Under liquid lubrication conditions, the sliding surfaces are separated by lubricating oil without direct contact, which can greatly reduce friction loss and surface wear; the oil film also has a certain vibration absorption capacity. However, the starting friction resistance is relatively high. The part of the shaft supported by the bearing is called the journal, and the component mating with the journal is called the bearing bush. The anti-friction material layer cast on the inner surface to improve the friction properties of the bearing bush surface is called the bearing lining. The materials of the bearing bush and bearing lining are collectively referred to as plain bearing materials.