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The variety of machine types, combined with the differences in the application condition leads to different requirements for bearings normally, there will be no less than two bearings applied on one shaft.
In addition, for the purpose of convenience in fixing axial position, normally one bearing is used to fix one end and the others free on the other end of the shaft. The following table provides the choice on bearings on the fixing end and on the free end of the shaft.
Table1 Bearings on the fixing end and the free end | | Content | Applicable bearing types | | Bearings on the fixing end | - Fix the bearing in the axial direction
- Choose bearings that can carry body the radial load and the axial load
- In order to carry double-direction axial load, strength must be considered according to the amount of the axial load while mounting
| Deep groove ball bearings
Combined angular contact ball bearings
Self-aligning ball bearings
Cylindrical roller bearings with flanges(NUP and NH types)
Double-row taper roller bearings
Spherical roller bearings | | Bearing on the free end | - The bearing must adapt to the shaft expansion caused by the changes in temperature while working and adjust the bearing position in the axial direction.
- Only the bearings with separable inner ring and outer ring that can carry radial load should be chosen.
- With non-separable bearings, there should be a clearance between the outer ring and housing in order to adapt the bearing to the shaft expansion in the axial direction.
Sometimes, the adaptation is achieved with the contact surface between the shaft and the inner ring.
| - Separable cylindrical roller bearings(NU or N type)
- Non-separable types
Deep groove ball bearings
Combined angular contact ball bearings(back-to-back arrangement)
Double-row angular contact ball bearings
Self-aligning ball bearings
Double-row taper roller bearings(3700 type)
Spherical Roller bearings
| | Regardless of fixing end or free end | - When the distance between the two bearings is small, and the effects of shaft expansion are not important, two angular contact ball bearings or taper roller bearings that can carry axial load can be used together in face-to-face or back-to-back arrangements.
- Use screw nut or filling piece to adjust the axial clearance after mounting.
| Deep groove ball bearings
Angular contact ball bearings
Self-aligning ball bearings
Cylindrical roller bearings(NJ and NF types)
Taper roller bearings
Spherical roller bearings | | Vertical shaft | - Bearings that can carry both radial load and axial load should be chosen for the fixing end. If the axial load is too big, use the combination of thrust bearing and radial bearing.
- Similarly, only bearings that can carry radial load should be used to adapt to the shaft expansion.
| - For fixing end
Combined angular contact ball bearing(back-to-back arrangement)
Double-row taper roller bearings(37000 type)
Combined thrust bearing and radial bearing arrangements
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