View Here : Planetary Gear Set
Essentially, each gear range in your automatic transmission has a planetary gear system. Some are called compound planetary systems. The more gears or speeds your trans. has:.. the more planetary gears areÂ in the transmission, which are then termed compound planetary gear sets.
The set up shown in this video can be simplified as two planetary gear sets with common sun and common pinion/carrier but different Ring gears. Ratio from first set is Note that horizontal directions represents the speeds ( one rev at Sun, zero at Ring and x is what carrier will get depending upon the lever ratio).