Bearings during operation, the bearing performance is the most important factor is the speed of the bearing problem. The designers often early in the design set its limit speed bearing models has its own speed limit is determined by physical characteristics, such as size, type and structure Limiting speed bearings The maximum operating speed (typically r / min), exceeding this limit will result in bearing temperature, lubricant dry, even bearing stuck. Limiting speed of grease lubricated bearings, bearing oil supply affect the speed up to the limit lower than oil lubricated bearing speed limit. Provides several bearing lubrication form the speed limit correction coefficient (K). Note must be greased bearings, the ultimate speed is generally only 80% of the speed limit when the bearing to repeat the cycle of a high-quality oil system, but mist lubrication system, the ultimate speed is generally higher than the same basic lubrication system 50% higher.
Use desired speed range helps determine what type of bearing is given the typical speed range of the most common bearing. D is the bearing size, it is usually refers to the pitch circle diameter of the bearing, the bearing is selected, using the average of the bearing inner and outer diameters, unit mm.
Shaft rotation speed (r / min) multiplied with the pitch circle diameter D to derive a limit speed factors (DN), the DN in the choice of type and size of bearings is very important. Most bearing manufacturers directory limit speed value of its products, the practice has proved, below the limit speed to 90% of the state is good.
 



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