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EXPERTS IN BEARINGS SOLUTIONS |  Made in Austria 

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CLUB BIKONE

BEARING LIFE

This is defined as the life expectancy reached by 90% of the same bearing group subjected to equal operating conditions prior to the occurrence of material fatigue.
Calculation of Dynamic Loaded Bearings
For a calculation of the nominal bearing rating life L10 in terms of millions of km, the formula below must be applied:

Where:
  • p= life exponent for ball bearings: p = 3
  • L10 = nominal rating life [km]
  • C = dynamic load rating [kN]
  • Cr for radial bearings
  • Ca for thrust bearings
  • P = dynamic equivalent load [kN]
  • D = wheel diameter [mm]

Dynamic equivalent load P
The formulas for the calculation of the dynamic bearing life as previously stated, anticipate a load of uniform magnitude and direction that acts radially only (for radial bearings) or axially and centrally (for thrust bearings.). In case of bearings that are exposed to combined dynamic loads the single load components have to be transferred into an imaginary load which affects the bearings in the same way as the actual forces. This imaginary load is called dynamic equivalent load P.
P is calculated in the following manner:
Where:
  • P = dynamic equivalent load [kN]
  • X = dinamic radial factor (given in product tables)
  • Fr = radial bearing load [kN]
  • Y = dynamic axial factor (given in product tables)
  • Fa = axial load [kN]