Minimum load

To achieve satisfactory operation, double row tapered roller bearings, like all ball and roller bearings, must always be subjected to a given minimum load, particularly if they are to operate at high speeds, or are subjected to high accelerations or rapid changes in the direction of load. Under such conditions the inertia of the rollers and cages, and the friction in the lubricant, can have a detrimental influence on rolling conditions in the bearing arrangement and may cause damaging sliding movements to occur between the rollers and raceways.
The requisite minimum radial load to be applied to double row tapered roller bearings can be estimated using

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minimum radial load [kN]
basic dynamic load rating [kN] (see product data)
When starting up at low temperatures or when the lubricant is highly viscous, even greater loads may be required. The weights of the components supported by the bearing, together with the external forces, generally exceed the requisite minimum load. If this is not the case, the double row tapered roller bearing must be subjected to an additional radial load. This is particularly easy to apply with tapered roller bearing arrangements by adjusting the inner or outer rings against each other to give an axial preload.
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