Corrosion - Bearing to iron spacer?
Corrosion - Bearing to iron spacer?
(OP)
In our large bearing assemblies we use a cast iron (class 40) ring to locate the preload springs for the thrust bearing. Under load, the ring and bearing surfaces are forced together. At teardown there is discoloration, pitting and even metal transfer between the 2 surfaces. Most drives are electric and correctly grounded, etc. Could this be galvanic, just a mechanical condition or lube related?
Any input is greatly appreciated!
Thanks
Any input is greatly appreciated!
Thanks
Keep the wheels on the ground
Bob
showshine@aol.com
RE: Corrosion - Bearing to iron spacer?
1) The ring is pressed to the springs
2) the tempr. may be high due to lube problem
3) Due to the high tempr. the metal melts and plastic welding phenomena occurs.
You can use high viscosty oil or syntheic oil for lub.
You can also change the material of ring which can sustain high tempr.
Piyush Joshi
RE: Corrosion - Bearing to iron spacer?
RE: Corrosion - Bearing to iron spacer?
We switched to syn oil for OEM initial fill a few years ago. Its a non-rotating fit, but there could be some fretting as the thrust loads change. Haven't gotten any field feedback yet. Customers tend to randomly change lube brands so there could be some reaction internally with noncompatible oils.
I'm redesigning the preload arrangement to reduce the potential for movement, so if it is fretting this could be the fix. Of course I won't know for certain until 2 or 3 years from now!
Keep the wheels on the ground
Bob
showshine@aol.com
RE: Corrosion - Bearing to iron spacer?
You might also consider using something like Loctite "bearing mount" or equiv. between the faces.
RE: Corrosion - Bearing to iron spacer?
RE: Corrosion - Bearing to iron spacer?