The seal is a high-tech precision machinery parts, to prevent oil or other media leaks through the seals and the contact of the rotating shaft. Oil seal a wide range of applications, where there are parts of the axis of rotation basically can not be separated from the oil seal. The factory has a lot of pump bearing housing, gear box and liquid-gas power equipment, water vapor, dust has a strong lethality of these devices within the lubricating oil, hydraulic oil, and will have a strong wear. According to statistics, 79% of the equipment failure is caused by a seal or bearing failure. Bearing failure, 64% of bearing failure is caused by a seal failure. If the bearing failure, there will be at least 40% of the pump, the compressor of 50% and 80% of the motors to stop working. The tests showed that, If it enters the mass fraction of water in the lubricant oil, bearing the bearing service life may be reduced to 48%; if the solid particles have a diameter of 10 (equivalent to 1/7 of the hair) per ml Lube bearing life will be shortened by 20%. Oil seal seal failure is the main reason for the failure of rotating equipment. Thus, the current oil seal is still a weak link in all types of machinery.
Many types of oil seal, oil seal sealing form classification, lip seals, labyrinth seal and mechanical seal. Lip seal is divided into oil seals and other rubber skeleton oil seal and filled polytetrafluoroethylene (PTFE). Mechanical seal also known as seal, floating seal and magnetic and mechanical seals. Seal seal face wear resistance of a direct impact on the life of the oil seal, so how to improve the wear resistance of the oil seal seal faces is a worth to continue to study the problem.