AC /DC fans life report

Generally speaking, AC fans bearing life refers to the special service period under the actual service conditions (including working conditions, environmental conditions and maintenance and maintenance conditions " of the bearing).

1. Basic concept of fans bearing life According to the latest bearing fatigue life theory, a bearing with excellent design, excellent material, well manufactured and correctly installed, as long as the load is easy enough (not greater than the corresponding persistence limit load value of the bearing), the material of the bearing will never produce fatigue damage.

2.On-site using bearings, its working load is often greater than the corresponding fatigue persistence limit load. After working to a certain period of time, late or early always due to the fatigue limit of its own materials, fatigue peeling and can not continue to use,Even if the working load of some bearings is lower than the corresponding persistence limit load, it will wear and fail due to the difficult bearing pollution problem. In short, the bearings in the field use more or less can not fully meet the conditions of the above laboratory, and any of the conditions are slightly insufficient, will shorten the availability period of bearings, which produces the problem of bearing life.

2. fans Bearing life category

There are various forms of bearing failure, but most of them have no available life calculation method, only fatigue life, wear life, lubrication life and microdynamic life can be evaluated quantitatively evaluated by calculation method.

(1) Fatigue life Under the condition of sufficient lubrication and other normal use conditions, the bearing often fails due to fatigue peeling. The term fatigue life can be checked by the relevant data in samples, and calculated according to the prescribed formula and calculation procedure.

(2) Wear life The main bearing of the machine tool takes a large diameter to ensure its high stiffness, the size of the bearing is correspondingly large, in the far end of fatigue, fatigue limit, often due to wear so that it can not accuracy to continue to use, for this kind of bearing must use wear life to gain the possibility of service period.

(3) Lubrication life is mainly for grease lubrication bearings with double-sided seals, and no grease will be added after one filling. At this time, the life of the bearing depends on the service life of the rolling grease.

(4) The bearings in the micro-abrasion life winch, cantilever micro crane and gear transmission, and automobile clutch and other mechanisms are subjected to the micro-abrasion damage caused by the vibration load in their non-operating state

It often develops into the dominant cause of bearing failure, for bearings in such mechanism, sometimes need to calculate their microdynamic abrasion life.

The most common

fans ball life is used for about 50,000 hours at room temperature

fans sleeve bearing life lasts about 20000 hours at room temperature