Bearings. Can Outer Race rotatation in housing be acceptable?
Bearings. Can Outer Race rotatation in housing be acceptable?
(OP)
I am inspecting an Oilfield Triplex piston Mud pump and the Pinion shaft has two Self Aligning Roller Bearings (1 ea end).
Approx. diam 460mm. Max clearance as per spec is 0,040-0,1092mm between housing and Bearing OD, I.E. no interference fit. Max Pinion speed 417 RPM
During testing it was noticed that the outer bearing has turned a few degrees in the housing. The manufacturer states that there is an allowance for the shaft to float slightly to allow temperature expansion etc. and this might allow the outer race to rotate a few degrees.
My question is this:
Is it ever acceptable for the outer race to move (rotate)?
Will the clearance allow the outer race to spin or is this a normal clearance?
Approx. diam 460mm. Max clearance as per spec is 0,040-0,1092mm between housing and Bearing OD, I.E. no interference fit. Max Pinion speed 417 RPM
During testing it was noticed that the outer bearing has turned a few degrees in the housing. The manufacturer states that there is an allowance for the shaft to float slightly to allow temperature expansion etc. and this might allow the outer race to rotate a few degrees.
My question is this:
Is it ever acceptable for the outer race to move (rotate)?
Will the clearance allow the outer race to spin or is this a normal clearance?





RE: Bearings. Can Outer Race rotatation in housing be acceptable?
John R. Baker, P.E.
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RE: Bearings. Can Outer Race rotatation in housing be acceptable?
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
MintJulep (Mechanical)
27 Aug 12 23:11
Common and expected on railroad axles.
Interesting to hear about your similar experience.
Do you have any reference on this I can?
I personally don't think it is a problem but I need something to back it up with.
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
The important aspect as you know is which race is stationary with respect to applied load.
In original post, it appears the outer race is stationary with respect to applied load and loose fit selected accordingly between outer ring and housing. Should not be a problem at all to experience some movement at this interface (and as has been pointed out, often benefitical if bearing is required to float axially in the housing).
Double check that the seating surface is still smooth and round and meets your fit requirements before re-assembly, and you should be good to go.
Movement on the inner race on the other hand would likely advance quickly since rotating load with respect to an interface will encourage movement at that interface which can increase any loose clearance further.
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(2B)+(2B)' ?
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
RE: Bearings. Can Outer Race rotatation in housing be acceptable?
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