Abstract
In this chapter, the general concepts of ordinary gear trains are first described, particularly those concerning their efficiency and the obtainable transmission ratios. The same concepts are then extended to planetary gear trains and various methods of calculating the transmissions ratios achievable with these types of gear drives are defined. Some problems related to simple planetary gear trains are then examined, and the main characteristics of some of these gear drives are described and discussed. Particular planetary gear trains are then dealt with, such as those concerning summarizing and differential gear trains. The analysis is then extended to multi-stage planetary gear trains and parallel mixed power trains consisting of ordinary and planetary gear trains, and the calculation procedure is described of the braking torque to be applied to the members of the planetary gear train that are held at rest. Finally, the problem of the efficiency of a planetary gear train is addressed and discussed in its general terms, also with reference to those particular planetary gear trains used to realize large transmission ratios.
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