Ukrainian Journal of Mechanical Engineering and Materials Science
Permanent URI for this communityhttps://ena.lpnu.ua/handle/ntb/31565
Browse
3 results
Search Results
Item Theoretical foundations for the development of experimental equipment for determining the load capacity of speed change devices(Lviv Politechnic Publishing House, 2018-01-29) Malashchenko, Volodymyr; Strilets, Oleh; Strilets, Volodymyr; Lviv Polytechnic National University; National University of Water and Environmental EngineeringThe article gives the theoretical base for construction of equipment for experimental research of static, kinematic and dynamic characteristics of devices for speed change by epicyclic gear trains with closed circuit hydrosystems through the ring gear during the transmission by them of the periodic, shock long-term or short-term loads or their executive mechanism stoppage due to overload. This equipment can be successfully used for experimental study of devices for speed change by epicyclic gear trains with closed circuit hydrosystems through the carriers or sun gears.Item 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, UkraineThe 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.Item Fundamentals of creation of newdevices for speed change management(Publishing House of Lviv Polytechnic National University, 2015) Malashchenko, Volodymyr; Strilets, Oleh; Strilets, VolodymyrThe article deals with problem of speed change management in engineering, i.e., hoisting, building, road and land reclamation machines, cars and tractors, machine tools and other equipment. The review of the methods and devices for stepped, steppless and combined speed change process management have been performed. Their major disadvantages have been identified. Among others, main disadvantages of stepped speed management devices are the complexity of design, their large material consumption, the emergence of dynamic loads during the transition from one speed to another, even in case of synchromesh using. Continuously variable speed devices have intense components wear due to the use of friction connections like brakes or lock-up clutches. The authors lead to the conclusion about the need for new devices of speed change management to remove, or at least decrease, identified deficiencies. New devices suggested for speed changes management via epicyclic gear trains with a closed circuit hydrosystem. Those new constructions are supposed to remove abovementioned shortcomings and can be the basis and foundation for new devices creation and their further research.