If we use the big part of the sun gear as a male spline on the female billet coupling  this will greatly simplify the input shaft. This part of the sun gear is normally ground down and not used.

Still a work in progress.

Paul Lamar

I suspect machining a spiral or helical female  spline might be a real problem.
So extended point set screws to the rescue.

This is major simplification and addresses a problem we have had in the past with the pin joint failing between input shaft and sun gear.


It also does away with one more spline eliminating all back lash from that source.


Paul Lamar


Paul,
   How are you going to ensure that the set screws will seat down between the teeth on the sun gear ?
I see that the holes for the set screws are parallel with the axis of the input shaft whereas the teeth are not.
If the set screw tip coincides with the tip of the tooth it will be virtually useless.
       Chris.


I thought about it some more and I am going to cut the teeth off the sun gear the
way we do it now. That will reduce the diameter of the coupling and the helical
gear thrust needle bearings. That will extend the life of the thrust needle bearings.
It will be easier on the oil seal as well. I'll up load the new 3D's tomorrow.


If this works it will be the first real gear box  improvement in 20 years :)

Paul Lamar

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