Hi Jarrett,

  I am not doing this because I think this is a good way
  to make a twin pusher. As my old late friend Vance RIP
  used to say I am doing it because it is an interesting project.
  In the mean times I am waiting for slide throttle parts.

  The problem with spiral bevel gear sets is the separating forces
  between the gears. This amounts to a point load of about
  a thousand pounds at 200 foot pounds input. The traditional
  way of handling this is use big heavy bearings and a heavy
  thick wall spool. I am thinking of using a large diameter, thin
  section bearing to take the thrust load and a fabricated sheet metal
  spool. The 3.5 inch carbon fiber prop shaft will be bonded
  directly to the ID of the spool.

  Consider the red device a rock solid buttress.
  What does an FEA look like in the spool.
  Material is 4130.

  Thanks

  Paul Lamar

 Sorry Paul, just to clarify.. you want a 1000# linear force on
 the rim of the grey part as well as a 200ft/lb torque load at the
 same point?
 Any kind of finite geometry that I can use to put the load into [a
 hole or ...?]

 I'll get the model in and ready for some loads :)

 Jarrett

 I don't need the torque load now. I am looking at some thin section
 bearings and I want to get an idea how the stress will look
 in the stationary ball race just behind the gear. I suspect the torque
 load is inconsequential by comparison. The thin section bearing
 goes between
 the grey part and the red part.

 Paul


Alrighty, here's the results. I needed a 'point' to load to so I added a 0.5" boss [0.001" thick] to
be the point where I input the load into the part. I made the back end a 'block' rather than a thin
body [realized afterwards that might not have been what you wanted.. let me know and it's a
simple change to fix if needed]

I put 1000lb's into the 'point' and here's the results.

Let me know if you need more done.. it's in there now so easy to monkey w/.

Jarrett

Thanks Jarrett. Big surprise to me the flange is taking all the deflection
and stress. That means the ring gear. Very encouraging for thin section bearings.
We might have to put a bulkhead in the small end of the cone to stabilize
it but that will add very little weight. Can you do that and run it again.
Add a disk .125 thick disk on the small end of the cone.


Paul Lamar