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Super-Precision Contact Ball Bearings Loads
Equivalent bearing loads
When determining the equivalent bearing load for preloaded angular contact ball bearings, preload must be taken into account. Depending on the operating conditions, the axial component of the bearing load Fa for a bearing pair, arranged back-to-back or face-to-face, can be determined approximately from the following equations.
For bearing pairs under radial load and mounted with an interference fit
For bearing pairs under radial load and preloaded by springs
For bearings under axial load and mounted with an interference fit
For bearing pairs under axial load and preloaded by springs
For bearing pairs under radial load and preloaded by springs
For bearings under axial load and mounted with an interference fit
For bearing pairs under axial load and preloaded by springs
where
Fa axial component of the bearing load [N]
Gm preload in the mounted bearing pair [N] (Preload in mounted bearing sets) For S70 .. W series bearings, contact the applications engineering service.
Gsprings preload given by the springs [N] (for spindle applications, the bearing rings subjected to spring load must be free to move axially)
Ka external axial force acting on the bearing arrangement [N]
| Equivalent dynamic bearing load | Single bearings and bearings arranged in tandem: |
| For additional information |  |
Bearing pairs arranged back-to-back or face-to-face:
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The values for the factors e, X2 , Y1 and Y2 depend on the bearing contact angle and are listed for:
For bearings with a 15° contact angle, the factors e, Y1 and Y2 depend on the relationship f0 Fa /C0 |
| Equivalent static bearing load | Single bearings and bearings arranged in tandem: |
| For additional information |  |
Bearing pairs arranged back-to-back or face-to-face:
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If P0 < Fr , P0 = Fr should be used. The values for the factor Y0 depend on the bearing contact angle and are listed for:
For bearings with a 15° contact angle, the factors e, Y1 and Y2 depend on the relationship f0 Fa /C0 |
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| Load carrying capacity of bearing sets | The values for basic load ratings (C, C0) and fatigue load limit (Pu) listed in the product table apply to single bearings. For bearing sets, the corresponding values for single bearings should be multiplied by a factor, listed in (table 3) |
Symbols
C0 Basic static load rating [kN] (product table)
Fa Axial load acting on the bearing set [kN]
Fr Radial load acting on the bearing set [kN]
f0 Calculation factor (product table)
P Equivalent dynamic load on the bearing set [kN]
P0 Equivalent static load on the bearing set [kN]