Double ball bearing is high-end bearings. Bearing in several pieces of small ball around the axis, when the fan page, or the axis of rotation, the ball followed by rotation, as are the sphere, so friction smaller and does not exist the problem of oil spills.

Double ball bearing has the following three advantages:

Longer life expectancy;

Anti-aging properties, suitable for the high fan speed. Double ball bearing entire embedded in the fan in the rotating part is not in direct contact with the outside world;

The closure of the dual ball bearings and hydraulic bearing, especially dual ball bearings. In a sealed environment, the bearing of the work environment is relatively stable, the level of large-diameter fan 5000 rpm is almost double ball bearing.

The disadvantage of double ball bearing has the following two:

Manufacturing costs are high;

The same level of speed, noise (because the ball bearing points of friction increased 2-fold).


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