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Allowable Speed
As rotational speed of the bearing becomes larger, bearing temperature rises due to friction produced inside the bearing, producing damage such as seizure, making continued stable operation impossible. Allowable speed is the rotational speed limit at which the bearing can perform. Allowable speed differs according to bearing type, dimensions, precision, clearance, type of cage, load conditions, lubrication conditions, and various other factors. The catalog dimensions table gives allowable speed standards for grease and oil lubrication, but allowable speed is based on the following conditions:

» Bearing of proper internal design and clearance is
    correctly mounted.

» Suitable lubricant is used, and is properly replenished or replaced.

» Normal operating temperature under normal load conditions
    (P ≦ 0.09 Cr, Fa/Fr ≦ 0.3).

Correction is necessary if load is large (see Figs. 10.1 and 10.2). For sealed bearings, speed is determined by peripheral speed of the seal contact section. If a radial bearing is used for a vertical shaft, there are disadvantages concerning lubrication maintenance and cage guide, so about 80% of the allowable speed is suitable. If using in excess of the allowable speed, you must reconsider bearing specifications and lubrication conditions.
» For more information kindly check NTN catalog or Contact Us
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  Technical Support  
1. Bearing History
2. Types of Bearings
3. Types of loads
5. Clearance
6. Bearing Tolerance
7. Lubrication
8. Bearing Storage
9. Mounting and Dismounting
10. Bearing Failures
11. Prefix and Suffix Interchange
11. Allowable Speed
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