The oil seal body is formed by precise stamping of aluminum alloy sheet with clean appearance and light quality,which can effectively improve the cleanliness level of the engine and reduce the power loss of the engine.The main lip of the oil seal is made of fluorine rubber or PTFE material,which further idealizes the clasping state of the lip to the working shaft,which has an obvious effect on improving the service life of the oil seal and optimizing the working environment of the engine.