Selection of bearing size

The requisite size is determined based on the basic static load rating C0, as bearings and bearing units for high temperatures rotate at very slow speeds.
At high temperatures, the load carrying capacity of a bearing is reduced. This is taken into account by multiplying the basic static load rating C0 by a temperature factor fT.
The requisite basic static load rating can be determined using

C0 req = 2 P0/fT


C0 req=requisite basic static load rating [kN]
P0=equivalent static bearing load [kN]
fT=temperature factor (table)
The equivalent static bearing load P0 is obtained from

P0 = 0,6 Fr + 0,5 Fa


Fr=actual radial bearing load [kN]
Fa=actual axial bearing load [kN]
When calculating P0 the maximum load that can occur should be used and its radial and axial components inserted in the equation above. P0 = Fr should be used, if P< Fr.
For different loads and temperatures the requisite basic static load rating C0 req is shown in table. Using the requisite basic static load rating calculated from the above, or taken from table, a suitable bearing or Y-bearing unit can be selected from the product tables.
The bearing or Y-bearing unit selected should have a C0 value that is equal to or greater than the requisite value.
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