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The technical summary is fitted with corresponding sealing devices on both sides of the newly developed. Its function is to keep the internal grease (oil) from escaping during use, to ensure that the bearing is in a lubricating state, and on the other hand to protect the external dust or harmful gases from entering the bearing cavity, so as to prevent the bearing from being worn. Cause damage. Commonly used are rubber or engineering plastic seals, as well as steel stamped seals (or dust cover). The sealing structure of the sealing ring is various, and the sealing effect is also different. There is a gap between the sealing ring and the rotating shaft, which is called non-contact sealing. The smaller the gap is, the better the sealing effect is, but the smaller the rotation speed of the shaft is allowed; the opposite is the opposite. There is no gap between the sealing ring and the rotating shaft, which is called contact sealing. The larger the contact area of ​​the contact lip, the better the sealing effect, but the smaller the rotation speed of the shaft is allowed, the opposite is the opposite. The main research content of the sealing technology is to research and develop the corresponding sealing device applied under different working conditions, and the compatibility of the sealing ring material with the corresponding grease.
Selection basis
Bearing mounting and sealing devices have been used for nearly four years. Previously, the bearings were all open. To ensure the lubrication and dustproof of the bearings, the sealing device was placed on the shafts at both ends of the bearing. With the development of industry, especially the food industry, the popularity of modern office machinery and home appliances, the equipment design is compact, the weight is reduced to prevent water leakage and air leakage, and the bearings of the bearing itself with sealing devices appear. Firstly, it is widely used in deep groove bearings with a large amount of surface. In recent years, all kinds of rolling bearings have bearings with different sealing rings. Bearing sealing is one of the important directions for the development of bearing technology. One-quarter of the seals have been installed, and there will be 2-3 kinds of bearing structures every year for the next ten years, and 20-30 million sets of bearings will be developed into sealed structure bearings. Different structure bearings and different working conditions require different structure and material of the sealing ring, so the research and development workload is very large. Trends at home and abroad Japan's major bearing companies (Seiko, Toyo, Fujitsu, etc.) represent the direction of bearing seal technology development. They have a long history in the development of sealed bearing device technology, and the research depth is large. At present, the sealing technology is relatively mature. It has developed from a single sealing lip to a multi-sealing lip, and has developed a non-contact seal from contact sealing; from the product type, ball bearings and roller bearings are available. Following the international development trend, China has also developed deep groove ball bearings, water pump bearings, railway (tapered roller) bearings, needle roller bearings and short element cylindrical roller bearings with sealing rings, among which deep groove ball bearings The largest output and the widest application. According to the results of the National Technical Bureau's recent inspection of China's sealed bearings, China's sealed bearing structure design problems are large, the sealing effect is not good, the grease leakage phenomenon is serious, and the users reflect strongly. After analysis, the main reason is that the current design of the seal ring in China is unreasonable, the inner ring does not have a sealing groove, and the manufacturing precision is not high. Therefore, the future development trend of China's bearing sealing technology is: with deep groove ball bearing as the representative, carry out sealing technology test, find the best sealing ring structure and the best sealing life, carry out sealing material research, find wear resistance, aging resistance, resistance High temperature and corrosion resistant materials lay the technical foundation for improving the life of contact seals and developing seals that operate under high temperature conditions or in hazardous atmospheres.
Main research contents and objectives According to the current situation of poor quality of sealed bearings in China, the main research contents in the future are: firstly, research and test, and screen out the seal ring structure of deep groove ball bearings and develop the corresponding seal inner ring seal groove structure, carry out the current deep The replacement of the groove ball bearing sealing structure. In 2005, we will strive to catch the sealing performance of this type of bearing to the advanced level of similar products in the late 1990s. Secondly, in combination with the development of China's car industry, we will develop high-temperature sealed bearings suitable for long-term operation at 120-180 °C. The third is to use the railway vehicle bearing as the representative new structure for the cone series.
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