and on that note... are there any further questions.... WOW... Hey Steve..
damn son.. ya don't leave much to the imagination there.. thanks for the
Light Reading......
Keith Turk
Austin Healey 100 / Bugeye / Box Sprite / Bonneville Land Speed Racer
Camaro ( D Gas Altered )
----------
> From: Steve Byers <byers@cconnect.net>
> To: spridgets <spridgets@autox.team.net>
> Subject: Re: Front Wheel Bearings...
> Date: Sunday, May 09, 1999 2:36 PM
>
> Well, I'm not a GM automotive engineer, but I am an aircraft structural
> engineer with some experience in stress analysis of landing gears. My
> previous statement that the spacer adds no strength to the axle was based
> on the conclusion, from looking at the system design, that its purpose
is
> merely to ensure that a load on one ball bearing in the "non-thrust"
> direction is reacted by the other bearing in the "thrust" direction, but
> mostly by the point that Crash makes.
>
> Crash is exactly right that putting a tension load on the stub axle
> actually will reduce the capability of the axle to take a bending load.
> When the axle is bent upwards, for instance, the upper surface of the
axle
> is in compression, while the lower surface is in tension. I think that
> would be pretty evident to most people. The tensile stresses from pure
> tension and bending moment are additive, so that bending the axle upwards
> with a tensile load already on it would move the total tensile stress on
> the bottom surface closer to failure, while the bending moment would
> relieve the tensile stresses on the top surface.
>
> It is also not intuitively obvious to me that the amount of torque
applied
> to the axle nut will place the 1-inch diameter hardened steel axle under
> significant tensile stress at its base.
>
> I have a spare stub axle and bearings to take some measurements from, and
> plan to do some more investigation into this. My reference materials are
> at work, but I hope to be able to do a stress analysis of the axle and
> bearing system. I'll report my results later (if they prove my point!
> :-) ).
>
> Steve Byers
> Havelock, NC USA
> '73 Midget GAN5UD126009G "OO NINE"
> "It is better to remain silent, and be thought a fool
> than to speak, and remove all doubt" -- Mark Twain
>
>
> ----------
> > From: David Ramsey <dwramsey@worldnet.att.net>
> > To: Angela Hervey-Tennyson & Peter Westcott <toobmany@bigpond.com>
> > Cc: spridgets@autox.team.net
> > Subject: Re: Front Wheel Bearings...
> > Date: Sunday, May 09, 1999 4:49 PM
> >
> > Please ask your GM engineer why placing the axle in a state of tension
> reduces the bending moment stresses? Also why placing the hardned
bearing
> races in a state of compression with a spacer adds strength to the
system?
> This goes against everything I learned in strenghts of materials or in
> Mechanics of Materials, 3rd Ed Gere/Timoshenko. If anything an axle in
> tension has less resistance to bending moment stresses! Racers have
broken
> axles for years, thats why they buy the high strenght axles, it has
nothing
> to do with if they have spacers or not. The repeated high bending moment
> stresses that they place on the axles with big sticky tires is why they
> break. By the way I have run timken tapered cone rolller bearings with no
> spacer in my street bug-i for many years with no problems. Sorry guys,
> just had to say it!
> > Crash
|