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This section contains the bearing data that is needed for calculating the load and life of rotary bearings, including

Deep Groove Ball Bearings

where X and Y are dependent upon the ratio Co/Fsax, as listed in the following table:

 Co / Fsax e Fsax / Fsrad < e Fsax / Fsrad > e Xdrad Xdax Xdrad Xdax 5 0.35 1 0 0.56 1.26 10 0.29 1 0 0.56 1.49 15 0.27 1 0 0.56 1.64 20 0.25 1 0 0.56 1.76 25 0.24 1 0 0.56 1.85 30 0.23 1 0 0.56 1.92 50 0.20 1 0 0.56 2.13 70 0.19 1 0 0.56 2.28

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Cylindrical Roller Bearings

Cylindrical roller bearings do not typically experience significant axial loads, so we can assume the following:

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Needle Bearings

Needle bearings are designed to only withstand radial, not axial loads so that:

3. Safety Factor:

So >= 3

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Tapered Roller Bearings

A load component is produced in the axial direction when radial loads are experienced by angular contact and tapered roller bearings. Because of this asymmetry, these types of bearings are often used in pairs, either face to face or back to back. The axial loads can be calculated using the following equation:

Component load in the axial direction = Fai = 0.6 Fsrad / Xdax Let us assume that radial loads R1 and R2 are applied to bearings 1 and 2 respectively, and an external axial load Fae is applied as illustrated. If the axial load factors Xdax1 and Xdax2 and the radial load factor Xdrad apply, then the equivalent loads P1 and P2 can be calculated as follows:

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Angular Contact Ball Bearings (40º Angle of Contact)

A load component is produced in the axial direction when radial loads are experienced by angular contact and tapered roller bearings. Because of this asymmetry, these types of bearings are often used in pairs, either face to face or back to back. The axial loads can be calculated using the following equation:

Component load in the axial direction = Fai = 0.6Fsrad / Xdax

Let us assume that radial loads R1 and R2 are applied to bearings 1 and 2 respectively, and an external axial load Fae is applied as illustrated. If the axial load factors Xdax1 and Xdax2 and the radial load factor Xdrad apply, then the equivalent loads P1 and P2 can be calculated as follows:

A. Single or in tandem 40º angular contact ball bearings

B. Back to back or face to face 40º angular contact ball bearings

where Fsrad and Fsax are the loads acting upon the bearing pair.

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Self-Aligning Ball Bearings

where Xsax is given in NSK-RHP bearing tables (phone: 734-761-9500) for each type of bearing.

The numerical values for e, Xsax, Xdax2, Xdax3 are given in NSK-RHP Bearing Tables (phone: 734-761-9500).

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Self-Aligning Spherical Roller Bearings

The numerical values for e, Xsax, Xdax2, Xdax3 are given in NSK-RHP Bearing Tables (phone: 734-761-9500).

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Thrust Ball Bearings

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Glossary
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