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Old 03-25-2012, 01:50 PM   #1 (permalink)
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bearing question

a pinion bearing usualy revolves 7-8,000 rpm at the most.

if such a pinion is made to revolve at about 25,000 rpm(for example - if the drive shaft is attached to the axle side of the diff instead of to the pinion side),will the bearing hold? will it burn? will it hold but will not last very long?

are there special bearings that are made to hold such rpm??

thanks to those who can answer based on real knowledge and experience.
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Old 03-25-2012, 03:41 PM   #2 (permalink)
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All I can offer is that there is a thread on here somewhere about an axle that was found in the junkyard with two pinion gears. The cover had been modified to have a pinion bearing and support a rear drive pinion shaft.

That's all I got.
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Old 03-25-2012, 03:50 PM   #3 (permalink)
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A pinion bearing would only see 8000 rpm in a vehicle going turning 6500 RPM in over drive, basically doing 150mph plus. Realistically, it is designed to turn at 1500-3000 rpm normal highway speeds....
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Old 03-25-2012, 04:19 PM   #4 (permalink)
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you have my attention -what are you making ? I am thinking to have these kinds of rpms a ball bearing maybe even a swiss one would be needed . Jess
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Old 03-25-2012, 04:29 PM   #5 (permalink)
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Ceramic bearing?
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Old 03-25-2012, 10:37 PM   #6 (permalink)
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Many turbine engines runs those RPMs and higher, Very dangerous at those speeds when something comes loose though...
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Old 03-26-2012, 03:09 PM   #7 (permalink)
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Quote:
Originally Posted by onetoncv View Post
you have my attention -what are you making ? I am thinking to have these kinds of rpms a ball bearing maybe even a swiss one would be needed . Jess
i'm building something which involves two diffs mated together - the first gets power from a transmision to the axle side of the diff and puts the power out through the pinion and from there to another pinion of another diff which exits the power via the second diff's axle side.

that means reasonable rpm in/high rpm out/high rpm in/reasonable rpm out.

so there's no problem with both ends but ther is a speed issue in the middle where the two pinions see very high speeds which seems to be problematic.
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Old 03-27-2012, 12:33 AM   #8 (permalink)
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Originally Posted by trkklr77 View Post
turbine motors have zero lateral load on the bearings, fwiw.
pinion bearings get side loaded perportionaly to restance and shock load.
in what i'm building there's no lateral load at all.
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