Bearing grease lubrication and oil lubrication (oil bath lubrication) when the speed limit are shown in the tables bearing size, its value represents a standard design of bearings under normal load conditions (≤ 0.25 per cent C/P/≥ 13,Fa/Fr), rotation speed threshold. In addition, according to different types and brands of bearing lubricant, possibly better than other performance but does not apply to high speed rotation. C/P<13 load condition (the equivalent dynamic load p more than the basic dynamic load rating c 8% or so), or under synthetic load radial load axial load exceed 25%, amendments to the speed limit.
　Bearing speed main bearing friction heat induced temperature rise within the limits, but when speed exceeds a certain threshold, bearing will burn and not continue to rotate.
Considerations for measuring radial internal clearance of the bearing:
(1) as far as possible the use of special instruments and measurement method;
(2) using the hand measurement requirements of measuring higher measurement skills. This method of measurement error is large, especially when clearance is marginalized, prone to error, in which case the instrument shall prevail;
(3) when measuring feeler gauge should be according to the standard operation, shall not be used on the roller feeler gauge rolling past methods of measurement;
(4) in the measurement process, shall ensure the ball falling into the ditch; closed type bearings in front of the closed measurements; a Dutch instrument, measuring value by subtracting the load caused by increased clearance.
(5) for a multiple-row bearings, each clearance pass taking the arithmetic average of the clearance as the radial internal clearance of the bearing.
Limiting speed of bearings is the frictional heating does not cause burns and continuous rotation speed threshold. Therefore, bearing limit speed depends on bearing type, size and accuracy as well as lubrication, lubricants, maintaining the quality and quantity and type of material, loading conditions, among other factors.



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