| Items for analyses | Methods of choice |
| 1)Mounting space | Those can be put in the mounting space | - Since the rigidity and strength of the shaft have been considered in the designing, first of all the inner diameter of the bearing must be determined. But there are too many dimensional series and types, the most appropriate type must be chosen.
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| 2)Load | Strength, direction and nature of the load | - The load is subject to changes, such as the amount of the load, whether there is only radial load or not, whether the axial load is in single-direction or double direction, the amount of vibration or shock and others. These factors must be considered before choosing the most appropriate bearing type.
- Normally, the radial load carrying capacity of the bearings with the same ID are listed in the following order:
[deep groove ball bearings<angular contact ball bearings<cylindrical roller bearings<taper roller bearings<spherical roller bearings]
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| 3)Rotating speed | Those are suitable for the mechanical rotations. | - The limit speed of the bearing rests with not only the bearing type but also bearing dimensions, cage type，precision, load carrying conditions and lubrication methods. These factors must be considered for the choice.
- The following bearings are applied for high speed rotation:
[deep groove ball bearings<angular contact ball bearings<cylindrical roller bearings
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| 4)Rotating precision | Those can satisfy the rotation precision requirements | - Machine tool spindles, ages turbines and control machines entail high rotation precision，high speed and low friction. Bearings with precision degree 5 or over should be applied in these cases.
- Normally the following bearings are applied:
[deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings]
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| 5)Rigidity | Those can satisfy the rigidity of mechanical shaft system
[When carrying load, the contact surface between the rolling elements and the raceways can have elastic deformation.” High rigidity" means such elastic deformation shall happen at the smaller amount.] | - In machine too spindles and final deceleration device of automobiles and other applications, the rigidity of the bearing must be increased when the rigidity of the shaft is increased.
- The deformation of roller bearings when carrying load is smaller than that of the ball bearings.
- Rigidity can be increased by applying pre-load(negative clearance).These method is suitable for angular contact ball bearings and taper roller bearings.
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| Table1(2) The selection of bearing type |
| 6)The relative leaning of the inner ring and outer ring | Reason of leading to the relative leaning of the inner ring and outer ring must be analyzed (such as the load-included bending of the shaft, poor precision of the shaft and housing or mounting error),and the bearings that fit these conditions should be chosen. | - If the relative leaning between the inner ring and outer ring is too big, the inside load thereof shall do harm to the bearing. So bearing types that can carry this leaning should be chosen.
- Normally, the allowable sloping angle increases with the following order:
[cylindrical roller bearings, taper roller bearings, deep groove ball bearings(angular contact ball bearings),thrust ball(spherical roller)bearings]
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| 7)Mounting and dismounting | Check the frequency and methods of mounting and dismounting of the bearings regularly. | - If too much mounting and dismounting, choosing cylindrical roller bearings with separable inner ring and outer ring, needle roller bearings and taper roller bearing is comparatively convenient.
- With adapter or withdrawal sleeve, self-aligning ball bearings with tapered bore and spherical roller bearings with tapered
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