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The highlighted section below defines how shaft deflection within a roll affects the calculated life of the bearings.

Shaft deflection creates misalignment of the bearings and therefore introduces a life reduction factor. The graph below describes the generic relationship of ball and tapered roller bearing’s life factor as a function of misalignment.

 

The inputs for this section are used to describe the shape of the curve in the above graph for the bearings being used within the idler set design:

•Max Shaft Deflection W/O Life Correction – This is the maximum misalignment due to shaft deflection (in/in or mm/mm * unitless) that the bearing can have while still having no effect on life (life reduction factor is still 1.0).

•Shaft Deflection At Low Life – this is the misalignment due to shaft deflection where a significant amount of life reduction has occurred within the bearing, but there is still some life left in the bearing. In the graph above, this is where the downward trend of the curve starts to flatten out again.

•Shaft Deflection at No Life – this is the misalignment due to shaft deflection where there is so much misalignment there is no life in the bearing. In the graph above, this is the misalignment value where the curve intersects the 0 life reduction factor line.

•Life Correction at Low Life – this is the life correction factor at the Shaft Deflection At Low Life value that has been input by the user.