Tapered roller bearing surface of the high temperature lead to fatigue failure reason analysis

Bearing failure analysis, in order to improve the working reliability of system engineering is an important part of the bearing surface, Bearing job functions in the loss of its rules, lead to failure or does not work as failure phenomenon called ( Bearing fault can be divided according to their normal life, failure and premature failure of the two, it mainly for pitting corrosion and fatigue cause of bearing early failure analysis and put forward Suggestions for improvement, in order to improve the TIMKEN bearing life and reliability. TIMKEN bearing fatigue failure is a failure surface form, main performance for fatigue crack initiation, expansion and fracture process, under the alternating load generated by the fault of the long-term effects of the metal. Using glass fiber reinforced nylon 66 tapered roller bearing cage manufacture, apply to the stable state of working temperature is less than 120 degrees, use oil lubrication, the bearing if oil containing additives, may result in cage shorten service life. The temperature over 120 degrees, the aging of lubricating oil will shorten the life of cage. So we should pay attention to observe and oil change on schedule. Seal of TIMKEN bearings using the special test of high quality lithium grease lubrication. This grease can withstand the high temperature of 120 degrees for a short period of time. If a stable working temperature of 70 degrees or higher, the standard of lithium grease will shorten the service life. Always work under high temperature, special grease must be used, but also pay attention to whether need to use heat resistant materials as sealing device. The use of standard contact seal temperature cannot exceed 110 degrees. If you use the high temperature synthetic materials do seal, so consider this a very effective fluoride material in more than 300 degrees when gives off the gas and smoke is bad for your health. Especially when removing tapered roller bearings to use welding torch, more attention should be paid to it. Tapered roller bearing load capacity is much less than the same volume of sliding bearing, therefore, of the rolling bearing radial size large. So, under heavy load situations and demands radial size, structure compact occasion <> such as internal combustion engine crankshaft bearing, using sliding bearing. Bearing vibration and noise is bigger, especially in the use of late will emerge. , so, the requirements for precision bearing is very high, and don't have a vibration, generally choose the effect of the sliding bearing is better. Tapered roller bearing particularly sensitive to scrap metal and other foreign body, once with foreign body, can produce bigger vibration and noise in an intermittent, easy to cause damage. So the service life of rolling bearing has a certain limit. In short, some similar TIMKEN bearing is the shorter of the sliding bearing life.