Analysis of Complex Planetary Gearboxes

Željko Vrcan; Sanjin Troha; Kristina Marković; Dragan Marinković

doi:10.31181/smeor11202420

Authors

Željko Vrcan Department of Engineering Design, Faculty of Engineering, University of Rijeka, Rijeka, Croatia Author https://orcid.org/0000-0002-7005-4130
Sanjin Troha Department of Engineering Design, Faculty of Engineering, University of Rijeka, Rijeka, Croatia Author https://orcid.org/0000-0003-2086-372X
Kristina Marković Department of Engineering Design, Faculty of Engineering, University of Rijeka, Rijeka, Croatia Author https://orcid.org/0000-0003-1569-7464
Dragan Marinković Department of Mechanical Engineering, Berlin Institute of Technology (TU Berlin), Berlin, Germany Author https://orcid.org/0000-0002-3583-9434

DOI:

https://doi.org/10.31181/smeor11202420

Keywords:

Planetary Gear Trains, Multi Speed Transmission, Gearbox Design, Torque Method, Two-carrier Planetary Gear Train

Abstract

The ever-increasing demands for vehicle emission control have resulted in an expansion of planetary gearbox applications in road vehicles, due to their possibility to change the transmission ratio under load in synchronism with engine operation. Modern boxes are designed to extract the maximum number of transmission ratios as possible from the least possible number of simple component planetary gear trains (PGTs). The application demands dictate whether the box will be built with the maximum number of transmission ratios, or built for ruggedness and reliability. Component interconnections are designed to avoid power circulation, hollow shafts, or complex planet carrier arrangements when possible. The subject of this paper are multi-speed complex planetary gearboxes having at least two interconnected simple component PGTs controlled by brakes and clutches. Several variants of complex PGTs are examined together with the placement of brakes and clutches on their external shafts, and their transmission ratio functions are derived. The kinematics of multi speed gear trains are analysed as combinations of two or more two-speed gear trains. Several gearbox layouts are analysed, and their transmission ratio functions provided. Finally, an overview of the procedure for the calculation of creation of multi-speed gear trains is provided.

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