Limit the rotational speed of the bearing
Bearing speed is limited primarily by the internal friction bearing temperature rise caused by heat, when the speed exceeds a certain limit, the bearing will be unable to continue due to burns, etc. rotate.
   The speed limit is the bearing does not produce heat and can cause friction burns continuous rotation threshold.
   Therefore, the bearing speed limit depends on the type of bearing, size and accuracy as well as lubrication, lubricant quality and quantity, and type of materials to maintain a variety of factors, aircraft load conditions and the like.
   Various types of bearing limit speed for grease lubrication and oil lubrication (oil bath lubrication) when are contained in each bearing size table, its value represents a standard design of the bearing in the general load conditions (C / P> = 13, Fa / Fr <= rotation around 0.25) lower speed limit value.
   In addition, the lubricant according to their different types and grades, although better than the other properties may not apply to high-speed rotation.
Fixed speed limit

  When the load condition C / P <(ie approximately equivalent dynamic load P exceeds basic dynamic load rating C 8%) 13, or bear the synthetic load axial load exceeds 25% of the radial load, use the following formula to limit speed correction.
               *****************
             na = f1 * f2 * n
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Here,
   na: revised speed limit, rpm
   f1: load conditions correction factor (Figure 8.1)
   f2: with synthetic load-dependent correction factor (Figure 8.2)
   n: Under normal load conditions, the limit speed, rpm (refer bearing size table)
   C: Basic dynamic load rating, N {kgf}
   P: Equivalent dynamic load, N {kgf}
   Fr: radial load, N {kgf}
   Fa: axial load, N {kgf}

Limiting speed with a ring of ball bearings

  Limiting speed with contact seals (RS type) ball bearing ring contact surface is restricted line speed, allowing the line speed depends on the ring of rubber material.

High-speed rotation Caution

  Bearing in high-speed rotation, especially speed close to or exceed the size of the table according to the limit speed, the main should note the following:
   (1) The use of precision bearings
   (2) Analysis of bearing internal clearance (considering internal bearing clearance reduction temperature generated)
   (3) Analysis of the cage type material (for high-speed rotation, for the use of a copper alloy or phenolic resin cutting cage. There is also applicable to high-speed rotation of the synthetic resin molded cage)
   (4) analysis of lubrication (use for high-speed rotation of the circulation lubrication, jet lubrication, oil mist lubrication and oil lubrication lubrication)