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Know the fatigue life of the bearings, but a very useful thing, as long as not bearing to meet this fatigue values should all be no problem, so virtually equivalent change to the effectiveness of bearing play to the extreme, and in premise bearing damage.
Predict the fatigue life of the bearing, determine the remaining life, we need to know all bearing the phenomenon of fatigue damage, this will take a long time. However, due to the rolling contact fatigue fatigue occurs at the point of contact under compressive stress, to achieve breakage will occur a great deal of material changes. Therefore, in addition to the early cracks on the surface raceway suffered chemical effects of crack extension prior to the material change detection material changes likely to judge the degree of fatigue of the bearing.
Bearings to give full play to maintain its long-term due performance, regular maintenance (periodic inspection) must be really good job. Appropriate periodic inspection, so that early detection of fault, to prevent accidents in the first place is very important to improve the productivity and economy.
Bearings removed for inspection, good appearance record using photography and other methods. In addition, to confirm that the remaining amount of lubricant and lubricant sampling, then cleaning bearings.
a bearing wash cleaning sub-coarse and fine cleaning, the bottom of the container and can be used to put a metal grid.
rough wash oil using a brush to remove grease or sticky materials. Oil rolling bearing, note that due to foreign object damage rolling surface.
c, sperm washing, in the oil slowly rotating bearings, should be carefully carried out.
Commonly used cleaning agent is a neutral water-free diesel oil or kerosene and, if necessary, are also sometimes used warm lye. Regardless of what kind of cleaning agent, must often filtered to keep clean.
The degree of fatigue of the bearing can be measured by using the X-ray machine with a residual stress of the raceway surface, the width of the diffraction line demi, the change in the amount of residual austenite to master.
These values, the change appears as the fatigue aggravated. Due to residual stress will increase early in the fatigue saturated value, therefore, can be used to detect slight fatigue, but fatigue larger section, the the diffraction lines Banfu width of the residual austenite changes and fatigue The intensifies association. To test the value of these X-ray summarized as an index (fatigue index), to find a relationship with the the bearing durability test time.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 6808N NSK | 40 | 52 | 7 |
| 6307N NSK | 35 | 80 | 21 |