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Comparison of load capacities obtained for different gear ratio for the same central distance a = 100 mm and two module values 

Comparison of load capacities obtained for different gear ratio for the same central distance a = 100 mm and two module values 

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The basic parameters of the universal gear drives, except the axis height, are not defined by the standard, so the manufacturers of universal gear reducers can define them in their way. Most of the manufacturers followed the parameter values of universal gear reducers of leading world producers in order to ensure their interchangeability and the be...

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... Requirements are often contradictory, because on the one hand it is necessary to increase its efficiency, portability, flexibility, reliability and, on the other hand, reduce dimensions, price, delivery, … That's why a large number of research in the field of conventional gearboxes is dedicated to achieving these objectives. Analysis of the teeth number influence on the gear module size and load carrying capacity of universal helical gear drive is presented in literature [4]. The optimization of gearbox parameters is also often a modern research topic [5]. ...
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In modern industrial practice, there is a growing need for power transmission gearboxes with high gear ratios. Until a few decades ago this requirement was solved using conventional gear types (cylindrical, bevel, worm and planetary). The development of science has also resulted in the emergence of new types of power transmission gearboxes (harmonic drives, cycloidal reducers, ...) which are more often used today, especially when high gear ratios are required. Within this paper planetary reducer, cycloidal reducer and harmonic drives are presented. Their basic operating characteristics as well as the field of application in different working conditions are described. Mutual comparison was made from the aspect of dimensions, mass and efficiency for different gear ratios. For this purpose, catalogues of renowned manufacturers of these types of reducers have been used. The advantages of using new generation reducers are presented in this paper. Paper concludes with observations and guidelines for future research in this field were presented.
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The problem of defining the load (nominal torque on the output shaft - T2N) of universal gear drives depending on the size of the gear ratio is analysed in this paper. It is logical that the load capacity of gear drive depends on the weakest gear component. Since the gears are the most expensive components of gear unit, it tends to maximize their performance. However, for low gear ratio, i.e. for high speeds, the bearings often limit their load capacity since the same bearings are used in all transmission ratios because it is not practiced to oversize the bearings at low speeds. Nowadays, when high values of gear ratio are used, it is interesting to consider the dependence of the nominal torque at the output regarding to gear ratio and operating life of the unit.