Abstract
This paper deals with configurations of complex planetary gear trains consisting of two planetary gear trains of basic type. These gear trains are formed by linking shafts from different component gearsets and contain two carriers, and therefore designated as two-carrier planetary gear trains with four external and two coupled shafts. The structural configurations are pointed out, and additional research has been made into gear trains using coupled external shafts for torque input and output, with the controlling brakes acting on single external shafts. The kinematic schemes have been created for all analyzed PGT variants, and the available transmission ratio ranges calculated for both speeds. The transmission ratio is changed by alternating the activation of each brake, enabling their use as transmissions with two transmission ratios in transportation technology and other engineering applications. Extreme transmission ratio changes have been determined for each analyzed PGT design solution. Also, relations of ideal torque ratios to the required transmission ratios of component planetary gear trains for both speeds have been calculated. These relations enable the selection of compound gear train designs which will achieve the required pair of transmission ratios. The optimal design parameters for the adopted configuration were determined, and the optimal transmission solution for the given input data selected.
Highlights
There are many benefits that are inherent to planetary gear trains (PGTs) which make them more suitable than classical gear trains
Multicriteria optimization can be applied to every PGT type mentioned in Table 1 while keeping their specifics in consideration
This paper introduces the process of fast resolution of the internal structure and design parameters of twospeed compound gear trains
Summary
There are many benefits that are inherent to planetary gear trains (PGTs) which make them more suitable than classical gear trains. The procedure for selection of optimal PGT compound structures has been included in the software DVOBRZ and is based on suggestive systematic research delivered between 2006 and 2011 (Troha, 2011). A comprehensive method for researching the transmission ratio, the internal power flows and the efficiency of complex multi-planetary gear trains was covered in (Arnaudov & Karaivanov, 2005), while the determination of an optimised planetary gear train with a short center distance, light weight and high mechanical efficiency as an important issue in the preliminary design of power transmissions is presented in (Daoudi et al, 2019) , where traditional optimisation methods and non conventional methods, such as Genetic Algorithm Optimisation are used to determine the optimal dimensions of epicyclic gear train components. The described procedure is applied to a numerical example where an optimal transmission defined by structure and design parameters is realized by combining both softwares
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