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,

When I see the last photo with the sun gear maintained onto the shaft
with the two pins you made, I am asking myself if a company like PATC
Will not be capable of doing one global piece only. They already machine
gears to propose reinforced Ford E40D (with a ration of 2.71 instead of
2.85).
They have designed and are marketing a reinforced planet gear (with
pinions on bearings) and for their planet they machine the sun gear. I
am pretty sure they can machine a sun gear, with the necessary length to
install 2 bearings and  machine the spline shaft at the size of the Ford
input shaft to go inside the splined female coupling (the damper)
On the drawing where you give the dimensions, may we have the dimension
of the input shaft ? splines? Teeth? Etc??

Thanks
pascal

The OD of the male spline is .985". There are about 36 splines.

Paul Lamar

What is the overall length of the total piece Paul?


Thx
Pascal

The OA on the shaft is about 7 inches.
The spline is 1.75 inches long.

However I suggest you don't go this route and integrate the sun
gear with the male part of the rubber coupling. Worn splines lead to
back lash and back lash is particularly  bad when the prop is driving
the engine as the pilot pulls back on the throttle.

This is far stronger with no possible back lash. The female part of
the rubber coupling is bolted directly to the E-shaft.

Paul Lamar

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