case study : frequent faliure in fan shaft bearing type 22314 to replace it with types 6314 and the other NU314

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Repeated damage of both existing shaft bearings type 22314

 

Abstract: concept of direct couple overhung fan

Spherical roller bearings
Spherical roller bearings

Spherical roller bearings are not good at coping with loads that are mainly in the axial
direction. They must also have a radial load that is significantly higher than the axial
Load. Otherwise you get relative axial displacement of the inner and outer raceways.

Spherical roller bearing configuration
Increasing the reliability with respect to direct couple overhung fan

Spherical roller bearing configuration
Spherical roller bearing configuration

For bearing Types 1 and 2, the radial load needs to be somewhere around three or
four times the axial load. For Type 3, the radial load needs to be somewhere around
twice the axial load

If you don’t meet the radial to axial load requirements, and you are having failures,
then you should consider replacing the spherical roller bearings and Plummer blocks
with non self aligning bearings and an inline tunnel housing as shown below.

 

radial to axial load requirements
radial to axial load requirements

These arrangements are extremely reliable
The bearings used in these housings will depend upon the application, but they may
have angular contact ball bearings at one end and either a cylindrical roller or a deep
groove ball bearing at the other. This arrangement has a number of advantages over
spherical roller bearings and Plummer blocks. Not only do they eliminate issues bout
load ratios (i.e. no spherical roller bearings),but they lend themselves to lubrication
with oil rather than grease. With the right seals, this can be more reliable, and it also
means that you can monitor the condition of the lubricant and the bearings through
oil analysis. The downsides are that these arrangements cost more, and the fan
assembly may require more dismantling in order to replace the bearings. But the
reality is that you rarely have to

Conclusion
Spherical roller bearings are not always the most suitable bearing for use in
overhung fan applications. We often have these arrangements in our plants because
we make the mistake of buying to a price rather than considering reliability and whole
of life cost issues.

Expected Solution
To avoid the repeated damage of bearing, it is recommended to change the existing bearing
from 2 bearings type 22314 to be 6314 and the other NU314

 

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4 thoughts on “case study : frequent faliure in fan shaft bearing type 22314 to replace it with types 6314 and the other NU314”

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