Abstract
The development of designs of teeth, gear wheels and gears, which have found application in gearboxes of aircraft and helicopters, is presented. Parameters of different types of initial generating circuits, their modifications and examples of application corresponding gear wheels in gearboxes of airplanes and helicopters are considered.
 The main attention is paid to GOST 13755-2015, developed by CIAMD (Central Institute of Aviation Motor Development) and having a number of advantages over the old GOST 13755-81. The main advantage is achieved by replacing the standard tooth head height with a standard tooth tip thickness. When the teeth work along the entire active part of the gearing line with a profile angle of 250, high contact and bending strength is provided, as well as resistance against galling of the surfaces of the teeth of highly stressed gears.
 A further increase in contact strength and resource is ensured by using the initial generating circuit with a profile angle of 280. Gear trains with a guaranteed overlap ratio of 2.0 have a vibration level five times lower and, in general, their bearing capacity is approximately 1.5 times higher than that of highly stressed reduction trains with an overlap ratio less than 2.0. The asymmetrical teeth parameters were chosen to increase the density of the transmitted power, as well as to reduce the dynamic loads and vibration of the gear wheels.
 The strength of gear trains according to GOST 13755-2015 significantly exceeds the strength of gear trains according to GOST 13755-81, but the most significant advantage (more than twice) is obtained in terms of noise level. The highest strength of gears with a main circuit angle of 330 occurs at a guide circuit angle of 20 °.
 The highest stiffness of arched teeth of all designs provides arched gear trains with high durability and load capacity, which makes it possible to design reduction trains with smaller weight and size specifications.
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