Minimum Load-Spherical Roller Bearings
In order to keep bearings working in a good condition, a minimum load must be imposed on the bearings, particularly on bearings working at high speeds, high accelerations, or with 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 spherical roller bearing can be obtained from：
Fmin = 0.01 C0
When bearings are started at low ambient temperatures or in the condition that the viscosity of lubricant is very high, larger a minimum load is probably needed. Usually, the weight of bearing supporting parts plus the load on the bearing have been enough to 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 requirement of minimum load.