Dear professional,
the bearing is mounted at the input shaft of a gearbox driven by motor/belt 200HP/1500 rpm

the input shaft rotate 1300 rpm the o/p shaft 20 rpm driving a screw press

sever damage at only one race of the inner ring
sever damage of only one raw of rollers
the damaged race is at the gear side, the pulley side looks very good

the belt tension is correct, but we have this case many times

what could be the reason and how to avoid such failure
attached a photo
Regards
Pizo
Original Post
David G. is correct that more details of the gearbox design are needed to adequately diagnose this type of problem. But based on your verbal description only, since no photograph was attached, one would question if there is an axial force acting on the shaft that is forcing only one set of rollers to carry all of the bearing loads.
quote:
Originally posted by Pizo:
Dear professional,
the bearing is mounted at the input shaft of a gearbox driven by motor/belt 200HP/1500 rpm

the input shaft rotate 1300 rpm the o/p shaft 20 rpm driving a screw press

sever damage at only one race of the inner ring
sever damage of only one raw of rollers
the damaged race is at the gear side, the pulley side looks very good

the belt tension is correct, but we have this case many times

what could be the reason and how to avoid such failure
attached a photo
Regards
Pizo


Three things come to mind based on your description:
1) SRB is in radial load only and the outer race was constrained and not permitted to float to it's natural center with the inner race and rollers
2) SRB is in combined load (one set of rollers loaded only). In combined load an SRB will only use one row of rollers.
3) SRB is in combined load, but the unloaded row of rollers skidded.
Is it a repetitive failure? I observed one similar to your description. My bearing was failing every 3 months of operation. We checked everything and found no abnormality. Then we installed a sturdy bearing. It worked.No failures since last 4 years.

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