It seems still to be complicated and difficult to design the planet gear transmission.Therefore

in this paper

the complex epicyclic gear trains made up by two 2K-H differential gear trains are analyzed

the some complex epicyclic gear trains suitable to the gear ratio range of planet gear transmissions are selected to form the transmission design sketches assembled with brakes

and the transmission designed sketches with the relevant gear ratio formulas and their range of changes are listed in the table.During the design

based on the gear ratio of transmissions needed

the relevant sketches can be chosen from the table and the overall transmission design sketch and kinematic diagram of the planet gear transmission can be obtained

and at the same time

the corresponding gear ratio formulas can be found by referring to the table and the tooth number of various system gear trains can be calculated rapidly as well.