ABSTRACT
This chapter discusses Two-Carrier Compound Planetary Gear Trains (PGT) with Two Compound and Three External Shafts. Compound PGTs are complex devices whose analysis is considerably more complex than the analysis of simple ones. In general, different methods of PGTs analysis exist. Two, however, are the most commonly used: one is the analytical method of Willis, and the other is the graphical method of Kutzbach. Self-locking is obtained at close values of torque ratios tI and tII of the component PGTs when the compound PGT works as a multiplier. Moreover, this PGT is with internal power circulation. It is not difficult for a designer to estimate how simple and easy to apply in practice is the method of samples compared to the method of partial derivatives. It is very helpful and advisable for the reader to see how to determine the direction of relative power in even more complex PGTs—the three-carrier PGTs.
