Ukrainian Journal of Mechanical Engineering and Materials Science

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    Gears with asymmetric tooth profiles and new alternative method of their manufacturing
    (Lviv Politechnic Publishing House, 2017-10-19) Hrytsay, Ihor; Lviv Polytechnic National University
    The article presents a new gears cutting process – radial circular generating method and describes its multiple benefits for manufacturers of transmissions. The overall increase of efficiency is realized due to using a simple tool and the conventional gear tool machine for cutting gears of different types. In particular, this new method was used for cutting gears with the asymmetric profiles of wheel teeth, which allows considerably amplifying power transmission density, increasing load capacity, and reducing size and weight.
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    Optimization of structure of sorting vibratory separators
    (Lviv Politechnic Publishing House, 2017-01-01) Shenbor, Vladyslav; Korendiy, Vitaliy; Brusentsov, Volodymyr; Lviv Polytechnic National University, Lviv, Ukraine
    The problem of substantiation of operational efficiency of vibratory separators designed on the basis of vibratory hopper feeders with electromagnetic vibrations exciters and with conic working bowls is considered in the article. The complex of factors influencing the accuracy and productiveness of separation of coins and disk-shaped products on two or more fractions is overviewed. New models of structures for the effective solution of separation problems are proposed. The design of a highly-efficient and high-performance separator with independent oscillations disturbance is described. The results of experimental investigations of vibratory transportation in elliptical modes of vibrations and of the study of separation efficiency are presented. The recommendations that developers and researchers of such devices may use are given.
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    Justification of efficiency of epicyclical gear train in device for speed changes management
    (Lviv Politechnic Publishing House, 2017-01-01) Strilets, Oleh; Strilets, Volodymyr; Lviv Polytechnic National University, Lviv, Ukraine; National University of Water and Environmental Engineering, Rivne, Ukraine
    The article analyses the functioning of epicyclical gear train with closed circuit hydrosystem, where the driving element is the sun gear and driven one is the carrier or vice versa. Control element is the ring gear, which rotates or can be stopped by the closed circuit hydrosystem. We have conducted a theoretical research of efficiency in such epicyclical gear train. Using the means of computer modelling, we have obtained graphical dependences of the transmission efficiency from its parameters. The analytical and graphical dependences have been obtained allow visually verifying the change of efficiency value and evaluating it in terms of self-braking.