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

Here they are.

-----------------------------------------------------------------------------

This is for the 3.12 version. On the 2.85 the coupling is even smaller.

Get a small bench grinder and mount it on the tool post holder of your
lathe and you can grind the teeth off the part of the sun gear in question.

BTW this torque isolator is not a new idea. It is widely used on off road motor
cycles.

Paul Lamar

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