Dimensionamento de um redutor de engrenagens cilíndricas de dentes retos para uma esteira transportadora de pequeno porte

Abstract

Speed reducers have the function of reducing the input rotation in a system to an ideal operating value and are widely used in transmission systems in the most diverse applications. Aiming to develop a speed reducer for the operation of a conveyor belt, the present paper proposes the dimensioning of the internal components present in the reducer, being these its gears, shafts, keys and the selection of the used bearings. With the dimensioned elements, a 3D modeling will be made using SolidWorks CAD Software and CAE simulation of these. Taking as a starting point the linear speed of the belt and the information of the electric motor used, all the dimensioning was carried out. As a result, a configuration of two pairs of gears was obtained, one with 25 and 113 teeth, with safety factors of 3.8 and 1.3 respectively, and the other with 29 and 140 teeth, with safety factors of 1.4 and 3.3 respectively, arranged in 3 axes, with diameters of 20 mm, 22 mm and 35 mm, and safety factors of 5.2, 1.5 and 2.2 respectively and with keys according to the standard DIN6885 and bearings SKF61804, SKF61905 and SKF61807. This configuration provided a total reduction of 21:1 for the system, which allows the optimal linear speed of operation for the belt to be achieved. The finite element static analysis of the gears and shafts did not identify stresses greater than the yield strength of the manufacturing material of these components, even in the most extreme situations. With this, it is attested that the components dimensioned in this paper must support all the efforts for which they were dimensioned.