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Interference ball bearing FittingPost by ffbing, 2009-7-9, Views:
When a ball bearing is used, it is not used alone. It is likely to be used on a shaft or in a housing bore by an Interference Fit. The Interference Fit is described as a value of tightness between the shaft and bearing bore or the housing bore and bearing outside diameter, They are separated as Loose Fit, Light Interference Fit and Interference Fit.
As subject of the Fit, the purpose is to prevent creeping. Once creeping occurs, the temperature will be abnormally generated by the slipping abrasion. Creeping is associated with the slipping between fitted surfaces. It will be a cause of premature life failure or that the abrasion particles will enter the bearing and cause it to become noisy and eventually burn up.
Typically a large interference fit prevents creeping, but it is necessary to select the interference fit by giving attention to the reduction of radial clearance (negative clearance), the temperature distribution during the bearing operation (the change of the interference fit by temperature) and the influence to the raceways.
The following formula sets up a standard to calculate how much radial clearance is reduced when a bearing is pressed onto a shaft or into a housing.
| Interference fit a bearing on a shaft |
| Interference fit a bearing into a housing |
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