Abstract

In this chapter, the fundamentals of cylindrical involute helical gears geometry are given and the related main quantities are defined, including the total length of the line of action. The equivalent parallel cylindrical spur gears and their virtual number of teeth are also determined. The fundamentals of the cylindrical helical gears profile shift are then described, in its most general terms related to the variation of center distance. The load analysis of these gears is then performed and the thrust characteristics on shafts and bearings are defined. Short notes are also made on the parallel cylindrical double-helical gears. Subsequently, the main kinematic quantities related to the rolling and sliding motions of the mating teeth surfaces are defined and the instantaneous and average efficiencies of these gears are analytically determined. Finally, short nates on the main cutting processes of parallel cylindrical helical and double-helical gears are given.

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