Compound-planet split-ring planetary gearset

A compact planetary gearset, capable of relatively high gear ratios. The one before you has a ratio of approximately -18.06:1, which means, that turning the sun gear 18.06 times, will result in one outer ring turn in the opposite direction.

A great tool to study the advanced planetary gear systems and a very useful system in many applications, like valve actuators, robot arms and many others, where high gear ratios are desirable in a small package.

https://youtu.be/XHi1ssh9JNU