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Sealing devices can generally be divided into static seals (fixed seals) and dynamic seals (rotating seals).
The former is called gasket seal, and the latter is called gasket seal.
Sealing is indispensable for bearings. Sealing can not only prevent the leakage of lubricant, but also prevent the invasion of harmful foreign bodies. Otherwise, it will cause the abrasive wear of the bearing raceway, reduce the service life of the bearing, and make the bearing parts corroded by harmful gas and moisture, and accelerate the aging of the lubricant.