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hawle seals are a common term for general seals, simply referring to the sealing of lubricating oil. It is a mechanical component used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the components that need lubrication in the transmission parts from the output components, preventing lubricating oil from leaking. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring completely covered by rubber. Generally, when people refer to oil seals, they often mean this type of tc skeleton.