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(1), affecting the radial thrust ball bearing fatigue life factor is very large, can not be estimated or via all standard test conditions be eliminated, which resulted in the actual radial thrust ball bearing fatigue life very discrete, so the bearing fatigue The expression of life parameters rated life L10, the ISO recommendation R281 in clearly defined meaning for the L10 as follows:
"Quantitatively sufficient number of the same batch of bearings, its rated life L10 number of revolutions (or at constant speed with the number of hours that 90% of the batch bearing fatigue spalling occurs before the meet or exceed this transfer number (or hours). "So far, the countries in the world to comply with the above requirements.
In the United States and some other countries, but also with the use of the concept of value in life. Median life expectancy is a group of identical LM radial thrust ball bearings median life, referring to the heart of which 50% of the thrust ball bearing fatigue spalling ago to meet or exceed the total number of revolutions, or work at a certain speed from time to time number, the median life LM than the arithmetic mean of a number of bearing life. LM is generally median lifespan is about five times the rated life.
(2), the rated life concept only applies to a group of a sufficient number of radial thrust ball bearings, not for individual angular contact ball bearings.
In order to determine the removed angular contact ball bearings can be reused, to focus on checking the accuracy of its size, rotation accuracy, internal clearance and the mating surface raceway, cage and ring.
On the inspection results, may be used to bearing or bearings were judged proficient.
Determine the mechanical properties and the criteria according to the degree of importance and checking cycles vary. If the following injury, angular contact ball bearings can not be re-used and must be replaced.
a) the bearing parts of the faults and defects.
b) rolling surface raceway material peeling.
Heart will thrust ball bearings removed for inspection, first with photography and other methods to do the appearance record. In addition, to confirm the remaining amount of lubricant and lubricant samples, and then cleaning bearings.
a, angular contact ball bearings and precision cleaning of rough wash washing, and placed in the bottom of the container used metal grid.
b, coarse wash, brush, etc. used in the oil or grease removal adhesive material. At this point if rotating bearings in oil, attention and other damage due to foreign objects rolling surface.
c, sperm washing, in the oil slowly rotating angular contact ball bearings, to be carried out carefully.
Commonly used cleaning agents for the neutral water diesel or kerosene, is sometimes necessary to use warm lye. Regardless of what kind of cleaning agent filter should always be kept clean. After cleaning, immediately angular contact ball bearings coated with anti-rust grease oil or rust.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7320B NSK | 100 | 215 | 47 |
| 7320A NSK | 100 | 215 | 47 |