I'm still studying the best way to go with my PSRU.
and need some information.
What is the planetary gear bearing (plain or needle roller) in the

C6/E4OD planet.

Also need to know what the material the sun gear is made of.as I'm

considering cutting a spline

into the sun gear centre (as opposed to a shrink fit to the shaft, as I

assume most are using).

Any information would be appreciated as these questions come from an

Aviation Engineer from the

Sydney University who has offered assistance in the total project.
TIA
George (down under)

Its a needle bearing in the planet gears.
I have no idea on the sun gear material. Could be 4340 or some other

chrome

molly alloy. I'll bet it is hardened however. You'll play hell cutting a

spline

I would wager.

Paul Lamar

Thanks Paul,
That's a relief about the needle bearings, as my contact advised me that if
they were plain bearings
the planetary gears would need oil holes in them to forcing oil between the
planet and ring teeth, to
lubricate them, as there are no holes in the planet gears this then can't be
achieved. However with
needle roller bearings splash oiling is sufficient.
If Ed Anderson is reading this (hi Ed), it is another reason he needs an oil
bath (splash feed) for
the Ross.

On the Sun Gear, The University Development area has suggested cutting the
spline with wire cut
electrolysis system, can't remember it's proper name. They showed me an
example of the finish
and it's very nice and can do remarkably sharp edges - although this is not
necessary for the spline,
where sharp edges give stress points, but give an excellent example of how
accurate it is. The sample
had a different design each end of a 2" rod. the transition from one shape
to the other was remarkable,
in it's accuracy and finish.

Any suggestion on who to ask Paul on the material, of the sun gear, as they
would like to know as a matter of
Quality Assurance- perhaps Tracy might know.
George (down under)

I think you would have to find the right engineer at Ford.
A Rockwell hardness tester will tell you how hard it is in a mere moment.
EDM Electric Discharging Machining. That will indeed machine hard materials.
Might be a good idea for Tracy depending on the cost.

Paul Lamar
 
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