| Summary: | The paper presents the review of directions of development of the theory and practice of spiroid gears for the past two decades within the scientific production complex of Kalashnikov ISTU that involves the scientific department “Institute of Mechanics” and the small innovative enterprise “Mechanic”. This en-terprise became de facto the tasksetter and main investor of scientific and practical developments that can be divided into mutually related developments of the theory of gearing and methods of gear design, develop-ment of new varieties and advancement of the known gears, development of competitive layouts of gear-boxes and development of efficient techniques of gear and gearbox production. Development of the theory of gearing focused on creation of computer-aided means of design (the main of them is the software system “SPDIAL+”) provides the profound investigation of the process of tooth interaction with account of errors, elastic and elastoplastic strains of teeth and other elements of the design, localization of multi-pair contact, application of new schemes of tooth generation, optimization gear design with due regard to gear adaptation to real operation conditions and limitations of design and manufacturing procedures. Development and ad-vancement of different types of gears, their design and manufacturing techniques were mainly motivated by their implementation in the specific and under-investigated application area – low-speed heavy-loaded drives for pipeline valves. The practical effect of the development is illustrated by examples.
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