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Low Speed Bearings

Low Speed Bearings

Low Speed Bearings

(OP)
I have an application that requires a maximum radial load of 44,000 lbf and a maximum axial load of 3,200 lbf (both factored).  This is a low speed application (less than 5 rpm).  The bearing only makes a 45 degree (1/8) rotation every 45 seconds.  

I thought roller and ball bearings are primarily for higher rpm applications, such as > 300 rpm, and plain bearings (sleeved, bushing, etc) are for low rpm applications.  As I was researching this I read about "the change in friction with relative velocity in a sliding bearing".  If I'm not mistaken, if the sliding bearing does not hit the "aquaplane speed" it stays in the boundary lubrication regime which creates abrasion.  I would assume that sliding bearings are not meant to be used > ~85% of their operation in the boundary lubrication regime.  Am I wrong?  If not do they require specific lubrication?

More specifically, which type of bearing is best suited for the above mentioned application?

Thanks,
J

RE: Low Speed Bearings

Ball and roller bearings are not excluded from low speed applications such as yours.  This would be a good time to study a catalog.



 

Mike Halloran
Pembroke Pines, FL, USA

RE: Low Speed Bearings

As Mike says, ball and roller can be used.  Neither a roller bearing or a plain bearing will be moving fast enough to create a film between the moving elements.
I don't understand the old school imperial load units, but if they are high I would recommend a DX style from Glacier-Garlock (www.ggbearings.com) with grease lubrication.

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