Angular contact ball bearing speed increased restrictions is mainly because of the angular contact ball bearing friction fever induced by internal temperature, when the speed reaches a certain value, due to burn and cause cannot continue rotating angular contact ball bearing. The speed limit of marine crane bearing angular contact ball bearing is the frictional heating does not cause burns and continuous rotation of the boundary values.
Therefore, angular contact ball bearing limit speed depends on the angular contact ball bearing type, size and accuracy and lubrication, lubricant quality, cage and type of material, loading conditions and other factors. All kinds of angular contact ball bearings with grease lubrication and oil lubrication (oil bath lubrication) speed limit when contained in the angular contact ball bearing size table, its numerical Needle Roller Bearing representation standards for the design of the angular contact ball bearing under general loading conditions (C/P>=13, Fa/Fr<=0.25) limits when the rotation speed value. Bearing high speed rotating matters needing attention
High speed rotating note: bearing rotating at high speed, especially the speed of approach or exceed the speed limit size table records, should pay attention to the following matters:
(1) the use of precision bearing
(2) analysis of bearing internal clearance (bearing internal clearance considering temperature rise reduction)
(3) the analysis material of cage type (for high speed rotation, Taper roller bearings suitable for copper alloy or phenolic resin cutting holder. There is also suitable for synthetic resin forming high-speed rotating cage)
(4) analysis of lubrication (which is suitable for lubrication of high speed rotating, spray lubrication, oil mist lubrication and oil air lubrication, lubrication). 
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