Planetary Differential Gear - Educational model

My Educational Mechanical Examples SeriesThis model is one of my educational mechanical mechanism examples on 80mm x 80mm base plates.You can find all models of the series in this collection => [Mechanical Mechanism Examples] The present modelThis is an educational model of a planetary differential gear system, also known as Mechanical Paradox Planetary Gear System, which can realize much higher reduction ratio than a planetary gear system alone.Brief DescriptionIn this system, a differential gear stage is added after a planetary gear stage. In the planetary gear stage, the sun gear serves as the input, and the revolution of the three planetary gears— which orbit inside a fixed internal ring gear around the sune—forms the output. The planet gears have 12 teeth, the sun gear has 6 teeth, and the fixed internal gear has 33 teeth. If we look at the mechanism from a coordinate system that revolves together with the planet ge