"..." wrote:

Thanks,
Mark

Sure. That should work fine. You need a short section of no threads
to take the shear loads.

Paul Lamar

Paul,
What about the bending loads on the bolts - would they take it !?
George (down under)

What bending loads? There are no bending loads on the bolts/pinion shafts.
Each bolt/pinion shaft is in single shear. In fact if you wanted
a belt and suspenders approach there is room for six additional drive
pins between each bolt/        ( pinion shaft on the planet carrier.)

     Q ,  How would extra pins between pinions help?

Here is a slightly different housing using the same idea done by Butch.
It is a bit clearer than my illustration on the web site.
The shaft concept is by Bill Jepson.

    Q    Where is the thrust bearing?

    Q    How is the trust load transmitted to the hollow shaft?

   the shaft  will need a flange on the planet carrier end

The tube shaft with flanges is what I had in mind, I had sketched a number
of versions out, similar to Bill's last weekend, before I had seen his
concept, much simpler to make.
It will be very important to get the pinion shafts lined up
correctly,otherewise the pinions will
be running out of line, giving only point contact with shaft and outer gear
housing.
I don't think there would be much chance of getting any pinion shafts in
line if they were welded
in position.
I have an idea for the thrust collar but need some dimensions of pinions etc

Geoff

Extra pins would distribute the torque shear load over twelve surfaces
rather than only six. In that case the peak stress would be half
7,500 psi or 3,750 psi. IMHO not needed.

The prop thrust bearing is not shown unless you consider the bearings
symbols shown in Butch's illustration to be tapered rollers or ball
bearings.

The prop thrust load is transferred to the hollow shaft through the
threaded hollow prop drive pins or dowels. Same as a conventional solid
prop shaft and flange.

The pinion shafts are  held in alignment by the stock Ford planet carrier.
The planet carrier is still used but not shown in Butch's illustration.

It is very hard to illustrate this design clearly as it is very compact.
Most of these illustrations are missing one or more parts.
 
Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.