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L10 Life (hours)
1,389 hours
L10 Life (hours) vs Dynamic Load Rating (C)
सूत्र
Rolling Bearing L10 Life
The L10 life is the number of revolutions (or hours) at which 90% of identical bearings will survive.
Formula
L10 = (C/P)^p x 10^6 revolutions
L10h = L10 / (60 N) (hours)
where C is the dynamic load rating from the manufacturer, P is the equivalent dynamic bearing load, N is speed in RPM, and p is the life exponent (3 for ball bearings, 10/3 for roller bearings).
हल किया गया उदाहरण
A ball bearing with C=50 kN, operating load P=10 kN, at 1500 RPM.
- 01C/P = 50/10 = 5
- 02L10 = 5^3 x 10^6 = 125 x 10^6 = 125,000,000 rev
- 03L10h = 125,000,000 / (60 x 1500) = 1,388.9 hours
- 04At 8 hours/day, this is about 174 operating days.
अक्सर पूछे जाने वाले प्रश्न
What does L10 mean?
L10 is the life that 90% of a group of identical bearings will reach or exceed. The median (L50) life is about 5 times the L10 life. Individual bearing life varies widely.
Should I use p=3 or p=10/3?
Use p=3 for ball bearings and p=10/3 (3.33) for roller bearings (cylindrical, tapered, spherical). This reflects the different contact geometry and fatigue behaviour.
How do I calculate the equivalent dynamic load P?
For combined radial (Fr) and axial (Fa) loads: P = X Fr + Y Fa, where X and Y are factors from the bearing catalogue that depend on the bearing type and the Fa/Fr ratio.
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