Press fitted axis 2

[marcuscouceiro]

Dear All,

Here at company we have to install an axle onto two (3) bearings. After using Lame´s equation I was able to find the pressure generated due to the interference between the outer diameter of the axle(wich is solid) and the inner diameter of the bearings.

My question is regarding the necessary force to remove the axle from the bearings. Since I have the pressure at the surface of the axle I could use the F=uN formula to find the necessary force to remove (or install) the axle.

Based on your experience which value of ´u´ should I use? So far I have found values from 0.74 to 0.8 but since we have both surfaces really polished I was wondering if I could use another value.

If you know another value that could be used could you also inform where I could find it?

Thank you once again for your valuable help.

Marcus Montenegro

 

[Tmoose]

ball or roller bearings? The puller should contact the bearing inner race to prevent the pulling load from denting the elements. A rotating shaft with a ~ stationary load typically needs an interference fit in the bearings to prevent creep and rapid wear. As others mentioned the bearings internal clearance needs to allow for the inner and outer race fits.