Bearing Preload question.
Bearing Preload question.
(OP)
I am using 2 radial bearings, The inner race is stationary on a shaft, the outer race rotates with the bearing housing. I am using a tolerance ring to fit the outer race to the housing. I plan on using a wave spring washer to apply an axial force to hold them in the housing and to deal with manufacturing tolerances. My boss wanted me to see if the spring washer would apply enough force to pre load the bearings, but I did not think that pre load was a neccesity for radial bearings.
My questions are: Is it important to apply an axial pre load to the bearings, and if yes, how do I calculate the amount of force I need to apply.
My questions are: Is it important to apply an axial pre load to the bearings, and if yes, how do I calculate the amount of force I need to apply.





RE: Bearing Preload question.
describe your application to them. They are paid to
do that by their company.
RE: Bearing Preload question.
RE: Bearing Preload question.
RE: Bearing Preload question.
RE: Bearing Preload question.
I think you'll find a desireable preload is ~ "light" preload on a similarly sized precision angular contact spindle bearing, or as provided by a standard bearing preload spring provided by Smalley and others. Of course the bearing manufacturer's spec prevails.
I question if it can push hard enough to slide the bearing in the "tolerance" ring
RE: Bearing Preload question.
Thanks
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Eng-tips forums: The best place on the web for engineering discussions.
RE: Bearing Preload question.
http://www.usatolerancerings.com/
RE: Bearing Preload question.
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Bearing Preload question.
Mike Halloran
Pembroke Pines, FL, USA
RE: Bearing Preload question.
On principal I would not consider them for rotating machinery except maybe holding on a plastic cooling fan.
That is because I believe centering with flexible elements is imprecise, and I take reliable centering VERY seriously.
Nonetheless These guys use them for some big ball and roller bearing OD mounting in (aluminum ?) housings. Zoom 500% in on page 7 and see the thin dark rectangle on each of the bearing ODs.
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Also that the bearing balls are marked with an X, like a cartoon character's eyes after being struck by a brick
RE: Bearing Preload question.
I finally got in tough with the bearing manufacturers engineers, He said the bearings will run smoother and quieter with a light preload of 10-15lbs. He did say that not preloading the bearings will not affect the life of them as long as they are being pressfit into the outer housing and slip fit on the shaft. I dont know if preload changes for bearing size but I'm using 1" ID, 2.5" OD bearings.
RE: Bearing Preload question.
It is best if there is a way to keep the inner rings precisely separated at the same distance as the outer races.
One way is with an inner spacer
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Item #5 - disatanc collar
Or, shoulders machined on the shaft, necessitating assembling the bearings from each end
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