The skeleton oil seal is a typical representative of the oil seal. The oil seal often said on the market generally refers to the skeleton oil seal, the English name Framework Oil Seal. The role of the oil seal is generally to isolate the components that need to be lubricated from the output components in the transmission components, so as not to let the lubricant leak, it is usually used for the rotating shaft and is a type of rotating shaft lip seal. The skeleton is like a reinforcing bar in a concrete member, which plays a role in strengthening and keeps the oil seal in shape and tension. Common standards for skeleton oil seals are GB9877.1 / 2 / 3-88 series, GB13871-1992, etc. Generally, high-quality nitrile rubber, polytetrafluoroethylene, fluorine rubber, silicone rubber, acrylic rubber and other materials and steel plates are used to make The quality is very stable and the service life is very long.