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Interference ball bearing Fitting

Post 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 fitting a Ball  Bearing on a shaft  
From the formula below, radial clearance is reduced as much as the inner ring raceway diameter expands when the inner ring is pressed onto the shaft with an interference fit amount "i".

 
d :Inner ring bore Formula of the shaft bore  
d1 :Shaft bore (Soild type: calculate as  )
d2 :Inner ring raceway diameter  
i :Interference fit    
Eb :Young's modulus of inner ring    
Es :Young's modulus of shaft    
mb :Poisson's ratio of inner ring    
ms :Poisson's ratio of shaft    
   
 
Formula of the radial clearance  



Interference fit a bearing into a housing
 

Interference Fitting a Bearing into a Housing

  
From the formula below, radial clearance is reduced as much as the outer ring raceway diameter is shrunk when the outer ring is pressed into the housing with an interference fit amount "I".

 

D1

:Outer ring raceway diameter

D

:Outer ring outside diameter

D2

:Housing outer diameter

I

:Interference fit

Eh

:Young's modulus of housing

mh

:Poisson's ratio of housing

   
 
Formula of the radial clearance

For more details, please contact us.

 

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Tags: bearing fitting 
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