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One question, did you plug in the RPM used in this application when
calculating bearing life? It goes down real fast on some bearings
(especially tapered rollers).
Tracy
----- Original Message -----
Sent: Wednesday, February 09, 2005 5:30
PM
Subject: [FlyRotary] Re: PSRU - hub/prop
end
Ernest,
Seems like you have it completely under control, if
you researched the life
of the bearings, under the loads they carry you
will find that their
projected life would be something like 250,000
hours.
That's the answer I got from Timken! but the sizes may have been
different.
Anyway it gives you a bit of an idea.
George ( down
under)
> Did some research last night, and I am now very comfortable
with the
> taper bearing. There is in fact one on the other end,
but I was not
> considering it, because I view all the forces trying to
pull the hub off
> the shaft and the rear bearing won't see much stress
in that situation.
> Now I realize that the rear bearing will be
important to keep the hub
> aligned properly, and this won't happen
unless the correct preload is
> applied. I also understand that
the correct term for the load forces
> are axial and radial, not
longitudanal and lateral.
>
> >The nut will be for preload,
remember when you put it back on, that you
know
> >the preload
number.
> >
> >
> >
>
> Unfortunately,
the nut was finger tight and the keyed lock washer had
> never been bent
to lock it in place. I have no idea what the preload
> number is
or how to determine it. On cars, we always just tightened the
>
nut till there was no side play in the wheel but it still spun freely.
>
I would think that I'd want it a little tighter in this application,
>
since the forces will be trying to open up the rear seal and the only
>
thing stopping that will be the preload...but I don't have a number to
>
attach to 'little tighter'.
>
> >Again go to a bearing supply
company, I have no doubt that there would be
a
> >standard seal to
fit. Who ever made this PSRU would look for standard
seal
>
>sizes.
> >
> >George ( down under)
> >
>
>
>
> Thank you, George. I looked over Tracey's website
(thank you, Tracey),
> and several other places. I think in the
application that this hub was
> meant for (a racecar wheel), that the
car's wheel was the seal. I have
> a 1/4" plate that will sandwich
nicely between the prop and the hub. I
> can easily machine a
recess into it for a standard seal (I think).
>
> >>
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>
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