Referencing a June 2014 Article, “High Gear Ratio
Epicyclic Drives Analysis,” by Dr. Alex Kapelevich:
I have designed a small compound epicyclic gearbox
with common planets.
Sun = 10 teeth
Planet = 14 teeth
Ring Gear stationary = 38 teeth
Ring gear output = 41 teeth profile shifted onto a 38
tooth pitch diameter.
Carriers are simply cages for the planet alignment
According to your article, and according to my
calculations and the prototype I have built, my inputto-
output ratio is a reduction of 65.6:1. I am using a ~
VG1 viscosity grease and Nylatron materials for the
gears and carriers.