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SKF bearing sizable bearing life types and basic concepts
Source: Bearing network time: 2013-02-26
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1. The fatigue life is sufficient when the lubrication is sufficient and other operating conditions are normal; the rolling bearing often fails due to fatigue; the duration of the fatigue life can be found in the sample; the formula is calculated according to the formula and the accounting procedure with certain reliability. come out.
2, wear life number of the machine's main bearing to take a large diameter to ensure its high stiffness; the size of the bearing is correspondingly large; before reaching the fatigue limit at the far end; often due to wear and loss of precision to make it impossible to continue to use; The bearing must use the wear life to back and forth its effectiveness. In theory, most of the bearings used in the field fail due to excessive wear; so it is also necessary to consider the wear life problem.
3, the lubrication life is the first to double-sided sealed grease-lubricated SKF bearings; a grease filling will not make up for fatliquoring in the future; at this moment the bearing life depends on the life of the grease.
4, micro-motion abrasion life winch, cantilever-type micro-heavy machine and gear transmission and car clutch and other organizations in the organization; in its non-working state under the oscillating load caused by fretting abrasion damage. Often developed into bearings The leading cause of failure; for bearings in such organizations; sometimes it is necessary to account for the fretting life.
Second, the basic concept of bearing life is based on the latest theory of rolling bearing fatigue life; a SKF bearing that is excellent in description, excellent in raw materials, exquisite in making and correct in equipment; only needs to bear the load with satisfaction (not more than the corresponding bearing The durability limit load value); then the material of this bearing will never suffer from fatigue damage. Therefore, only the working environment temperature of the bearing is suitable and the fluctuation is not large; there is no solid dust, harmful gas and moisture intrusion into the bearing; The lubrication is sufficient and appropriate; the lubricant must be simple and free of impurities; and it will not age and change...; this bearing will work indefinitely.
The grim meaning of this theory is not only that it provides a more reliable guess of the modern bearing life than the ISO life equation; it also shows that the fatigue life of all rolling bearings has considerable development potential; and shows development This potential approach; thus has a profound impact on the development of bearing products, quality management and application technology.
However, the infinite bearing can only be "completed" under the conditions of the laboratory; and such conditions are related to the bearing used in the field under certain working conditions; it is difficult and too expensive.
SKF bearings are used on site; their working load is often greater than their corresponding fatigue endurance load; after the operation reaches a certain period of time; or late or early, it will always call the fatigue limit due to its own material; the fatigue will fall off and cannot be used continuously. Even Some SKF bearings have lower operating loads than their corresponding endurance loads; they also wear out due to difficult bearing contamination problems. Totally; the bearings in the field are more or less incapable of having the above-mentioned laboratories. Those conditions; there is a slight lack of any of the conditions; the bearing life expectancy will be shortened; this will cause the bearing life problem.
Generally speaking, the lifespan of a rolling bearing refers to the theoretical validity of the rolling bearing (including working conditions, environmental conditions, and protection and maintenance conditions, etc.); it can continue to adhere to the special function period of satisfactory operation function and work accuracy.
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