Principles and functions of grease in NTN bearings

Our customers always have some improper use methods when using all kinds of NTN bearing grease. Today we will explain the principle and function of the grease in the bearing.
  1. Principle of use of grease
Everyone is a liquid solution that is a very thick solution. This grease is composed of a reticulated soap fiber whose structure determines that it can adsorb a large amount of lubricating oil and make it work properly. But as you can imagine, if a sponge is squeezed, the water will flow out. Grease is also squeezed out of the lubricating oil, but the grease in the NTN bearing is rarely directly squeezed and drained, because a freshly lubricated imported bearing is moving in the inner space of the bearing during running. Its main working principle is "temperature".
  2. Practical function of grease
The main reason for draining grease to the sliding surface is the increase in temperature of the grease around the NTN bearing. When the bearing starts to run normally, the grease will reach the sliding friction surface. Lubrication begins to work as the temperature increases.
Advantages of NTN imported bearings with grease lubrication:
    1) Individual bearing points must be refueled by hand. If the grease is used, it will save trouble and avoid accidents caused by lack of oil.
    2) The grease itself has a sealing effect, which allows the use of a mechanism with a low degree of sealing to achieve a simplified design.
    3) Experience has shown that lithium grease lubrication has a lower temperature rise and longer bearing life than a drop method in a certain speed range (n<20000r/min or dn<20000mm.r/min).
    2, NTN imported bearing lubrication theory basis: the lubrication mechanism of the bearing is the theory of elastic fluid dynamic pressure lubrication.
    3. NTN bearing failure type and lubrication relationship: Most of the failure causes are caused by faults in the assembly and poor sealing. A small number of failures are caused by wear, gluing, corrosion and overheating due to lack or excess of lubricant or quality failure.
    4. Basic characteristics of grease and general criteria for selecting grease:
    When selecting grease, it is necessary to select the grease that is compatible with the conditions of use (temperature, speed, load, environment, etc.), which are related to the basic characteristics of the grease, and the basic characteristics of the grease depend on the thickener and base oil. kind of.

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Reasons affecting the service life of INA bearings

There may be many factors that affect the service life of the bearing, which can be further clarified from the application factors and meanings.
If the first element is used, it means whether the device adjustment, application maintenance, maintenance and repair, etc. can meet the technical request. According to the technical requirements of INA bearing device, operation, maintenance and maintenance, the monitoring and inspection of the load, speed, working temperature, vibration, noise and lubrication accepted by the bearing in operation are suspended, and the abnormality is immediately found and the adjustment is suspended. Make it back to normal. The premise of the device is one of the primary factors in the application of the element. The bearing often causes the force condition between the parts of the whole bearing to change due to the unsuitable device. The bearing runs under abnormal conditions and the service life is early.
The first element of the connotation refers to the three sketches of the quality of the bearing, such as structural design, manufacturing process and data quality.
The metallurgical quality of imported bearing data was once the primary factor affecting the early failure of rolling bearings. With the improvement of metallurgical technology (such as vacuum degassing of bearing steel), the quality of the original data has been improved. The proportion of the original data quality factor in the bearing failure analysis has been significantly reduced, but it is still one of the primary factors affecting bearing failure. The suitability of the material selection is still an essential element for the analysis of bearing failure.
Rolling bearings exhibit late failure characteristics
Rolling bearings show late fault characteristics to serious faults (generally INA bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual rolling bearing fault diagnosis, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.
Rolling bearing vibration and noise begin to increase
After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the INA bearing state is very stable and enters a stable working period. After continuing to run, the vibration and noise of the rolling bearing begin to increase, sometimes abnormal sounds appear, but the change of vibration increases slowly. At this time, the kurtosis value of the imported bearing suddenly reaches a certain value. We believe that the rolling bearing is an initial failure at this time.
Bearing manufacturing is customary through multiple processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. Thermal processing and grinding processes that affect the quality of scrap bearings are often more directly related to bearing failure. In recent years, the research on the turbulent layer of the bearing working surface indicates that the grinding process is closely related to the bearing surface quality.
The primary obligation of INA bearing life analysis is to find out the primary factors that constitute bearing failure based on a large number of landscape data, profiling data and failure mode, so as to propose improvement measures in a targeted manner, delay bearing decommissioning period and avoid bearing An early failure of a sudden fire.

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