Negative Nancy’s in this case include a large population of people who have had them fail and mechanical engineers who design stuff with bearings and know the B10 life of this ball bearing in the application is Probably an order of magnitude shorter than the factory roller.
If you’re making rolling element bearings post 1935 and you have a “bad batch” you don’t care or don’t know what you’re doing. Most likely these failures drop right into the normal distribution. It’s also possible that these bearings do or have at a time come from China and no, they don’t know what they are doing.
If someone can give me the part number of the green bearings (real one, etched on the bearing itself) I’d love to do the calculation. The rollers are a Timken M201047. Maybe I’m wrong. It would be interesting to do the actual calcs for expected life.
I'M WITH YOU....
In all the discussions about Timken Tapered axle bearings vs single row radial ball bearings, aka " Green" bearings, the Green bearing proponents have not supplied the actual bearing's part number to allow for actual design load comparisons to be shown. The physical dimensions of the bearing package not withstanding are not the only consideration.
Some of the other factors involved, specifically, RPM of the bearing's rolling element, radial load, axial load (combined) at maximumload points, temperature, and lubrication.
If all previous detrimental comments about failures are related to earlier installations, WHY are there continual instances of Green bearing failures reported, like in the previous posting (#16 above), where the bearing's lubricant is being extruded? USUALLY, internal seal failure and subsequent lubricant displacement is due to the bearings AXIAL load rating is being exceeded on a continual basis as well as temperature for the lubricant, due to internal heat generated because of loads imposed.
Perhaps, another underlying question needs to be asked: WHY was the Green bearing suggested as a substitute for the Timken Tapered bearing? COST? LONGEVITY? Because my "buddy" used them?
Am I a "negative Nancy".....YES....without actual calculations presented, one type of hearing vs another, to demonstrate the capabilities of each including the B10 and L10 factors, everything is just an opinion....."my way is better than your way" comments not withstanding.
BOB RENTON