Low Speed Bearings

[Josh2008]

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

 

[MikeHalloran]

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

 

[caoimhin1]

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 (

http://www.ggbearings.com)

with grease lubrication.