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Bearings
Application Knowledge Menu | Bearings
and Bushings Products and Supply
Ball Bearings life is related to load and
speed of rotation, and this relationship must be
considered when selecting bearings for various
speed and life requirements. Bearing life has been determined by testing at
bearing manufacturers. Bearing fatigue life has
been determined to vary inversely with the third
power of the applied load. This is expressed as follows:
Lf = Ca / [ Sf x P
x Hf ]
Where:
Lf = Life factor
Ca = Dynamic Load Rating ( manufacturer specified ) or Ct
for thrust
P = Applied load ( Effective or equivalent load may be used )
Sf = Speed factor ( manufacturer specified )
Hf = Hardness factor ( manufacturer specified )
Where determining the required basic dynamic load rating
determines the bearing choice, the follow equation applies:
Ca (or Ct) = P x Sf x Lf
x Hf
To calculate the allowable load your bearing will
support under the conditions of speed and life:
Pa = Ca (or Ct) / [ Sf
x Lf x Hf ]
Where:
Pa = Load allowed for conditions
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