Bearing speed mainly by friction within the bearing temperature rise caused by heat limit and the speed exceeds a certain limit, the
Bearing due to burns and the like can not continue to rotate.
Bearing speed limit is not generated friction heat can cause burns continuous rotation speed limit value.
Therefore, bearing speed limit depends on the bearing type, size and accuracy as well as lubrication, lubricant quality and quantity,
Various types of bearings lubricated with grease and oil lubrication (oil bath lubrication) speed limit are set out in the bearing dimension tables, the number of its
Value represents the standard design of the bearing in the general load conditions (C / P / ≥ 13, Fa / Fr ≤ 0.25 or so) the rotation speed
In addition, the lubricant according to the different types and grades, although better than the other properties may not apply to high-speed rotation.
Load conditions C / P <13 (ie, equivalent dynamic load P exceeds basic dynamic load rating C is about 8%), or exposure to synthetic
Load the axial load exceeds 25% of the radial load, use the formula for the speed limit to be amended.
Na = F1 · F2 · N
With contact seals (RS type) ball bearing speed limit by the seal contact surface line speed restrictions, allowing wire-speed
Bearing rotating at high speed, especially speed close to or exceed the speed limit listed in dimension tables, the main thing to be aware of the following
Item:
(A) use of precision bearings
(2) analysis of the bearing internal clearance (considering the temperature rise of the bearing internal clearance reduction)
(3) The material of the cage type (for high-speed rotation, suitable for cutting copper alloy or phenolic resin cage.
There is also suitable for high speed rotation of the synthetic resin molded cage)
(4) Analysis of Lubrication (used for high-speed rotation of the circulating lubrication, spray lubrication, oil mist lubrication and oil lubrication
Etc. Lubrication)
 
 



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