From the viewpoint of long life, bearing selection requirements are:
(1) Select a high load bearing capacity of model
Bearing selection should take into account the price of the bearing, or the use of more expensive but with higher load bearing, or bearing on the ordinary and the other managed to extend its life.
Using a high load bearing capacity, for example, with crown of cylindrical roller bearings, spherical roller with symmetrical roller bearings, reinforced tapered roller bearings and ball bearings, ball groove ball bearings bus modified, or 70000CD series instead of deep groove bearings (single row radial) ball bearings, these bearings have high load capacity or because of improved stress distribution, or because a larger number of rolling elements may have a higher fatigue life.
(2) select the appropriate bearing size
For bearing size selection was appropriate, must be accurately calculated or actual work of checking the bearing load, speed and operating temperature.
Load the greatest impact on bearing life, so load as much as possible although difficult to measure but also accurately measured. When the load measurements are difficult to measure the actual motor power consumption, according to the transmission line projection and less power loss along the way, until a more realistic calculation of the bearing load. Calculated or measured load is too large, the bearing fatigue life must be expected with greater amplitude decreases, must try to remedy the situation. If the installation site to allow the optional size of the bearing freshman profile; if the radial size is limited, in the case of bearings with wide wide bearings should be selected; If you can not use a wide bearings, load carrying capacity could be replaced higher bearing.
(3) select the appropriate bearing material
Choice of bearing materials also take into account its price, and when forced to use a vacuum or electro slag remitting of steel smelting, we should pay attention to the need to perfect lubrication conditions, in order to exponentially increase the fatigue life of bearings can be expected. Of course, such high-quality steel used by the system bearing the cost of a higher load capacity than the choice of bearing much more expensive, but difficult to close and the machine is extremely difficult to dismantle the bearing, or in mines, tunnels, operating machinery used in bearings, maintenance extremely difficult situations, sometimes still have to consider.



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