Rolling Bearing Basic Life (L10)
Rolling Bearing Basic Life (L10)
Rolling bearings are selected on fatigue life. The L10 life is the number of revolutions 90% of bearings survive.
For ball bearings L10 = (C/P)³ million revolutions. where C is the basic dynamic load rating and P the equivalent dynamic load.
Inputs
C := 30 kN=30000 N
P := 6 kN=6000 N
Apply the ISO ball-bearing life exponent of 3.
L10 := (C/P)^3=125
Results
The result is in millions of revolutions; divide by the shaft speed to get hours. Because of the cube law, halving the load multiplies life eightfold.
Assumptions & limitations
- Ball bearing (exponent 3; use 10/3 for rollers).
- Constant load and speed.
- Adequate lubrication and clean operation.