Technical summary in the newly development of rolling bearing two end face, fitted with corresponding sealing device. Its role, on the one hand, is to keep the inside of the bearing grease (oil) in use does not leak, ensure bearing in the lubrication state, on the other hand is to protect the dust or harmful gas bearing outside will not enter the bearing inner cavity, in case of bearing damage. Common seal with a rubber or engineering plastic, also have a steel plate punch the sealing ring (or dust cover). The sealing ring seal structure is varied, the sealing effect is different also. There is gap between seal ring and the rotation, said non-contact seal, the smaller the gap, the better sealing effect, but allow the speed of the shaft is smaller; Instead. Sealing ring with no clearance between shaft, said contact seal, seal lip contact contact area is larger, the better sealing effect, but allows the shaft speed is smaller, on the contrary. Sealing technology main research content, research and development is applied to the corresponding sealing device under different working conditions, and the sealing ring material and corresponding to the communion of the grease, etc.

Selection basis

Bearing installation sealing device is nearly four years past bearing are open, in order to ensure the bearing lubrication and dustproof, sealing device is located in the bearings on both ends of the shaft. Along with the development of the industry, food industry, in particular, the popularity of the modern office machinery and electrical appliances, equipment design is compact, the weight to prevent leaks, gas leakage, it appears the bearing itself bearing with seal. First is in deep groove bearing enormous quantity wide application is more, in recent years, all kinds of rolling bearing with different sealing ring of bearing, bearing seal bearing technology is one of the important direction of development, a quarter of the current our country bearing production has been shipped sealing ring, each year over the next decade there will be two or three bearing structure, 2000-30 million sets of bearings developed into the bearing seal structure. Different structure bearing and use of different operating mode, require sealing ring structure and material is different, so the research and development workload is very big. Development trend both at home and abroad in Japan a few big bearing company (seiko, Oriental, nachi, etc.) represents the bearing seal technology development direction. Their history in the development of seal bearing assembly technology, early research depth, sealing technology is relatively mature at present. Has been developed from single sealing lip to the sealing lip, from contact seal developed non-contact seal, etc.; Look from the product type, ball bearing, roller bearing are. Follow the international development trend in our country, also developed with a ring of deep groove ball bearings, water pump bearings, rail, tapered roller bearings, needle roller bearings and RMB short cylindrical roller bearing a few kinds of bearings, including deep groove ball bearing production is the largest, most widely used. According to the national technology recently sealed bearing to our country quality testing results, the sealed bearing structural design problem in our country is larger, the sealing effect is bad, fat leakage phenomenon more serious, users reflect the strong. Through analysis, the main reason is that the current seal design structure is unreasonable, inner ring without seal groove, coupled with the manufacturing accuracy is not high reason. Bearing seal technology in China, therefore, the future development trend is: represented by deep groove ball bearings, sealing technology experiment, finding the best sealing ring structure and the best seal life, study on sealing material, looking for wear resistance, aging resistance, high temperature resistant and corrosion resistant material, in order to improve the contact seal life, development under the condition of high temperature or in bad mood work under the conditions of sealing ring technology foundation.

The main research content and target according to the current our country the status quo of the poor quality of the sealed bearing, the main research content is: first is the study of experiments, and screened the deep groove ball bearing seal structure and the development of the corresponding bearing inner ring seal groove structure, the current deep groove ball bearing seal structure upgrading. To make this kind of bearing seal performance in 2005 to catch up with the international advanced level of similar products in the late 90 s; Secondly, it is combined with the development of car industry in China, the development is suitable for long-term work in 120-180 ℃ high temperature heat sealed bearing; The third is a delegate with railway vehicle bearings taper roller bearing series in sealed structure and new.