Minimum Load-Taper Roller Bearings
In order to ensure bearings work in good condition, a minimum load must be imposed on the bearings, particularly on bearings working at high speeds, high accelerations, or with the load direction changing frequently, because under these working conditions, inertial force of balls and cage and lubricant friction will have bad influence on the rotation of bearings, and detrimental sliding movement may be caused.
The minimum load of a taper roller bearing can be obtained from:
Fmin=0.02C
C-Basic dynamic load rating,KN
When bearings are started at low ambient temperatures or in the condition that the viscosity of lubricant is very large, then a minimum load is required. Usually, the weight of bearing supporting parts plus the load on the bearing should be over the minimum load. If the weight cannot be up to the minimum load, then extra radial load must be imposed on this type of bearing in order to meet the requirements of minimum load. The requirement can be met through preloading with axial springs.