Oil Seal is a common term for general seals, which simply refers to the sealing of lubricating oil. It is a mechanical component used to seal grease (oil is the most common liquid substance in the transmission system, also commonly referred to as a general liquid substance). It isolates the components that need lubrication in the transmission components from the output components, so as not to let the lubricating oil leak. The seals used for static and dynamic seals (usually reciprocating motion) are called oil seals. The representative form of oil seal is TC oil seal, which is a double lip oil seal with self tightening spring and completely covered by rubber. Generally speaking, oil seal often refers to this type of TC Oil Seal. The representative form of oil seal is TC oil seal, which is a double lip oil seal with self tightening spring and completely covered by rubber. Generally speaking, the oil seal often refers to this type of TC skeleton oil seal, and the schematic diagram of the skeleton oil seal is shown in the figure.