Bearing OD Fits or Anti-Rotation Features
Bearing OD Fits or Anti-Rotation Features
(OP)
I have a current in-place design that uses a pin and mating machined slot on the bearing OD to prevent rotation. From the historical record it appears to be this feature was added as an after thought.
My questions are:
Are proper bearing fits, tolerances and finishes sufficient to control rotation in a properly designed bearing application?
Are these not most likely the rexult of bad designapplication, balancing or is this common in some cases?
These are high grade, grease packed, radial ball bearings running at around 30000 RPM.
My questions are:
Are proper bearing fits, tolerances and finishes sufficient to control rotation in a properly designed bearing application?
Are these not most likely the rexult of bad designapplication, balancing or is this common in some cases?
These are high grade, grease packed, radial ball bearings running at around 30000 RPM.





RE: Bearing OD Fits or Anti-Rotation Features
If rotation in the housing is a problem (due to an aluminium housing for example, or an out of balance load), its best not to reduce the fits. Common practice is to use rubber O-rings in the housing...or if spending money on a special bearing isn't a problem, use a lock pin in the bearing OD.
RE: Bearing OD Fits or Anti-Rotation Features
RE: Bearing OD Fits or Anti-Rotation Features
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These ones are fitted to the bearing by the bearing manufacturer. Unless using large volumes, its usually more cost effective to machine the grooves in your housing, fit o-rings yourself and then use standard bearings.
RE: Bearing OD Fits or Anti-Rotation Features
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(2B)+(2B)' ?
RE: Bearing OD Fits or Anti-Rotation Features
Frank
RE: Bearing OD Fits or Anti-Rotation Features
"Just adding"
1) We produce rotary polymer seals. Some of them are made for high speed rotating. In these cases, an O-ring on the "static" part of the seal is, also, the part we use on these seals in order to avoid self-rotation of the seal, as soon as housing don't allow to install another kind of seal more adequate for this work!
2) Ticona has a good document on tribology (about plastics -that's my field) showing different behaviours on the same plastic against metals with different finishes. I assume tribolgy on metal-to-metal should be similar
http://www.hidromar.es