When the bearings operating under radial load, bearing load  and non load zone area, if the bearing has a radial clearance, non-load zone of rolling and roll does not end within a single role may be due to centrifugal force and external circle contacts, which at low speeds, centrifugal force is less than body weight when rolling, rolling down cake with experience within the raceway or bearing cage collision and stimulate the inherent vibration and noise, and has the following characteristics:

1 in a specific range will produce different sizes of bearings and the speed ranges.

2 only radial load roles are large and the radial clearance is also easy to produce.

3 may also be a continuous sound or intermittent sound.

4 easy to produce grease lubrication, oil lubrication is not easy to produce. When using low-grade grease more tax.

5 Motivation long flights occurred.

6 The forced vibration excitation of the outer ring often second, third bending natural vibration, which issued a transformation of health.
 



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