Autors: Ivanov, V. V., Alexandrov, A. S., Tomova-Damyanova, E. L., Vountzoukli K., Yilmaz M.S., Amygdalopoulou A., Tsonev, V. C., Kuzmanov, N. I. Title: Experimental Study on the Influence of Load-Equalizing Devices on Planet Loads in a Planetary Gear Set † Keywords: FFT, load-equalizing devices, planetary gear trainsAbstract: The uneven load distribution between the planets in planetary gear trains has found multiple solutions including high manufacturing precision, targeted compliance or kinematic mobility of the components of the gear train. This paper presents an experimental investigation of the influence of three different load-equalizing devices on planetary gears’ pin loads in a planetary gear train with three planets. Two of the equalizing devices are designed to increase the radial resilience of the planets, and the third one increases the radial and tangential resilience of the sun gear. Using fast Fourier transform (FFT), the pins’ bending stresses are presented as a function of time and the gear wheels’ rotational frequency. For the experiments, a mechanical closed-loop test rig, designed at the Technical University of Sofia, was used. References - Bodas A. Kahraman A. Influence of Carrier and Gear Manufacturing Errors on the Static Load Sharing Behavior of Planetary Gear Sets JSME Int. J. Ser. C 2004 47 908 915 10.1299/jsmec.47.908
 - Arnaudov K. Karaivanov D. Planetary Gear Trains Taylor & Francis Group, LLC. Abingdon, UK 2019
 - Hicks R. Load Equalizing Means for Planetary Pinions U.S. Patent 3,303,713 8 February 1965
 - Neubauer B. Lastverteilung und Anregungsverhalten in Planetengetriebesystem Ph.D. Thesis Technical University Munich Munich, Germany 2016
 - Baumann F. Theoretische Untersuchungen zur Lastaufteilung und Lastverteilung in Planetengetrieben Ph.D. Thesis Technical University Dresden Dresden, Germany 2012
 - Hu Y. Talbot D. Kahraman A. A Gear Load Distribution Model for a Planetary Gear Set with a Flexible Ring Gear having External Splines ASME J. Mech. Des. 2019 141 053301 10.1115/1.4041583
 - Shyamsananth M. Manish A. Ganesa S.P. Influence of rim-thickness on planet bending stresses and load sharing Proceedings of the ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2011 Washington, DC, USA 28–31 August 2011
 - Shivputra A. Shrigandhi G. Gear Fault Identification by using Vibration Analysis Int. J. Curr. Eng. Technol. 2016 247 253 10.14741/Ijcet/22774106/spl.4.2016.51
 - Aherwar A. An investigation on gearbox fault detection using vibration analysis techniques: A review Aust. J. Mech. Eng. 2012 10 169 184 10.7158/M11-830.2012.10.2
 - Vernekar K. Kumar H. Gangadharan K.V. Gear fault detection using vibration analysis and continuous wavelet transform Procedia Mater. Sci. 2014 5 1846 1852 10.1016/j.mspro.2014.07.492
 - Dimitrov L. Michalopoulos D. Apostolopoulos C.A. Neshkov T. Investigation of Contact Fatigue of High Strength Steel Gears Subjected to Surface Treatment J. Mater. Eng. Perform. 2008 18 939 946 10.1007/s11665-008-9321-6
 - Mozafari S. Rezazadeh Mohamadi M. Dolatkhah Takloo S. Mardani M. Design of a mechanically closed-loop test rig for testing aviation industry’s gearboxes Aviation 2017 21 132 142 10.3846/16487788.2017.1415225
 - Lee G.-H. Park Y.-J. Nam J.-S. Oh J.-Y. Kim J.-G. Design of a Mechanical Power Circulation Test Rig for a Wind Turbine Gearbox Appl. Sci. 2020 10 3240 10.3390/app10093240
 - Mihailidis A. Athanassios I. A new system for testing gears under variable torque and speed Recent Pat. Mech. Eng. 2009 2 179 192 10.2174/2212797610902030179
 - Götz J. Siglmüller F. Fürst M. Otto M. Stahl K. Experimental investigation of the dynamic load sharing of planetary gearboxes Springer Nature, Forsch Ingenieurwes 2022 86 295 302 10.1007/s10010-021-00507-5
 - Bulduk M.E. Çalışkan C.İ. Coşkun M. Özer G. Koç E. Comparison of the effect of different topological designs and process parameters on mechanical strength in gears Int. J. Adv. Manuf. Technol. 2022 119 6707 6716 10.1007/s00170-021-08405-4
 - Chaolin T. Kesong Z. Wenyou M. Panpan Z. Min L. Tongchun K. Microstructural evolution, nanoprecipitation behavior and mechanical properties of selective laser melted high-performance grade 300 maraging steel Mater. Des. 2017 134 23 34 10.1016/j.matdes.2017.08.026
 
 Issue
   | Engineering Proceedings, vol. 104, 2025, Albania, https://doi.org/10.3390/engproc2025104031 |  
  |