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

    1. Deep Grove Ball Bearings

    2. Cylindrical Roller Bearings

    3. Needle Bearings

    4. Tapered Roller Bearings

    5. 40º Angular Contact Ball Bearings

    6. Self-Aligning Ball Bearings

    7. Self-Aligning Spherical Roller Bearings

    8. Thrust Ball Bearings

1. Equivalent Static Load:

2. Equivalent Dynamic Load:

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

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

1. Equivalent Bearing Static Load:

2. Dynamic Load:

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

1. Equivalent Bearing Static Load:

2. Dynamic Load:

3. Safety Factor:

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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 = F_ai = 0.6 F_srad / X_dax Let us assume that radial loads R₁ and R₂ are applied to bearings 1 and 2 respectively, and an external axial load F_ae is applied as illustrated. If the axial load factors X_dax1 and X_dax2 and the radial load factor X_drad apply, then the equivalent loads P1 and P2 can be calculated as follows:

1. Combined, equivalent static load:

2. Combined, equivalent dynamic load:

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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 = F_ai = 0.6F_srad / X_dax

Let us assume that radial loads R₁ and R₂ are applied to bearings 1 and 2 respectively, and an external axial load F_ae is applied as illustrated. If the axial load factors X_dax1 and X_dax2 and the radial load factor X_drad apply, then the equivalent loads P1 and P2 can be calculated as follows:

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

  1. Combined, equivalent static load:

  2. Combined, equivalent dynamic load:

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

  1. Combined, equivalent static load:

  2. Combined, equivalent dynamic load:

where F_srad and F_sax are the loads acting upon the bearing pair.

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1. Combined, equivalent static load:

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

2. Combined, equivalent dynamic load:

The numerical values for e, X_sax, X_dax2, X_dax3 are given in NSK-RHP Bearing Tables (phone: 734-761-9500).

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1. Combined, equivalent static load:

2. Combined, equivalent dynamic load:

The numerical values for e, X_sax, X_dax2, X_dax3 are given in NSK-RHP Bearing Tables (phone: 734-761-9500).

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Combined, equivalent static load:

Combined, equivalent dynamic load:

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