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Selecting appropriate shaft and housing tightness fits are critical in optimizing a single row radial ball bearing’s performance and life. A bearing can only perform to its full capacity when it is correctly fitted on the shaft and in the housing. Improper fits can lead to undesirable operating conditions and early failure.
Below are some of the common considerations bearing users should consider:
Direction, type, and magnitude of loads
Based on the actual applied axial and radial loads an equivalent radial load is calculated. Generally, tighter fits are required as the load increases. Further, rings subjected to circumferential loading should have tight fits. For rings subjected to only point loading, a loose fit may be used.
Inner or outer ring rotation
Typically, the ring that is rotating requires an interference fit, and the non-rotating ring would have a slightly loose fit.
The size and type of bearing specified
Thin type and miniature bearings are very sensitive to interference fits due to loss of radial play. Bearings with heavier cross sections generally require tighter fits.
Material and manufacturing tolerances of mating components.
Fit tolerances are based on cast iron or steel housings and shafts. For alloys such as aluminum (with a different modulus of elasticity), a tighter fit is required to achieve rigid seating.
Operating temperature
With tight fits and a temperature differential between the inner and outer ring, the radial internal clearance in the bearing is reduced. This must be taken into consideration when selecting the internal clearance. Additionally, if the materials used for the housing or shaft are dissimilar, they will have different coefficients of thermal expansion than the bearing rings. This must be taken into consideration to achieve rigid seating.
Running accuracy required
In order to achieve high running accuracy, the same high standard of accuracy and surface quality expected in the bearing must be applied to the shaft and housing as well. In addition, with miniature and thin type bearings irregularities on the shaft or in the housing are transferred to the relatively thin walled bearing rings.
Want to learn more about radial ball bearings and the factors that can extend or shorten their operating lives? Try AST’s new calculator.
If you need assistance with understanding radial ball bearings fits, our team of bearing experts are standing by to provide engineering consulting and design.
The important stage is which has a major impact on a bearing service life, which can be organized during the bearing's life.
These grades are mounting, lubrication, and alignment the basic condition of monitoring and dismounting.
For the individual application, you may need mechanical heat or hydraulic mounting methods for the accurate and effective mounting of bearing.Select the right mounting technique for your application, and that will help you to increase the service of your bearing's life and reduce the costs.
The right and perfect quantity of the right grease, which you can apply at the right intervals.
The continued lubrication can also be performed by using automatic lubricators, which provides a more consistent, correction and contamination grease supply.AlignmentBearings and bushes suppliers have mounted the bearings in the application which should be aligned.
If your application is not decent, the association can be the cause of the bearing enduring additional load, friction, and vibration.These can stimulate weakness and reduce the bearing's as well as the other machine component's service record.
