Bearings Application Knowledge Menu
Bearings and Bushings Products and Supply

Ball Bearings life is related to load and speed of rotation, and thisrelationship must be considered when selecting bearings forvarious speed and life requirements. Bearing life has been determined by testing at bearing manufacturers. Bearing fatigue life has been determined to vary inverselywith the third power of the applied load. This is expressed asfollows:

 L_f = C_a / [ S_f x P x H_f ]

Where:

L_f = Life factor
C_a = Dynamic Load Rating ( manufacturer specified ) or C_t for thrust
P = Applied load ( Effective or equivalent load may be used ) 
S_f = Speed factor ( manufacturer  specified )
H_f  = Hardness factor ( manufacturer  specified )

Where determining the required basic dynamic load rating determines the bearing choice, the follow equation applies:

C_a (or C_t) = P x S_f x L_f  x H_f

To calculate the allowable load  your bearing will support under the conditions of speed and life:

P_a = C_a (or C_t) / [ S_f x L_f  x H_f ]

Where:

P_a = Load allowed for conditions

© Copyright 2000 - 2012, by Engineers Edge, LLC All rights reserved.
Disclaimer

Home
Engineering Store
Engineering Training PDH
Products & Services
Engineering Forum
Engineering Design Data
Engineering News
Engineering Videos
Engineering Calculators
Engineering Jobs
Industrial News Buzz
Newsletter Register
Feedback
GD&T Training ASME Y14.5-2009
DFM Training
Contribute Article

Copyright Notice