Effect of pitting on excitation behaviour of a planetary gear set with sequential mesh phasing

Uwe Weinberger, Bernhard Kohn, Max Fromberger, Michael Otto, Karsten Stahl

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations

Abstract

Compared to gearboxes with cylindrical gear stages, planetary gear stages have an increased power density. Hence gear failures could lead to a malfunction of the whole gear box. Condition monitoring helps to detect gear failures. Pitting on the flanks of gear wheels is one mechanism of gear failure. Pitting does not lead to instant failure, but increases during running time. Hence the characteristics of the excitation behaviour of a planetary gear stage worsen during running time. Due to rotating planet shafts, measurements on separate gear meshes are connected with great effort. Measurement results for transmission error of a single stage, e.g. transmission error of the stage sun-planet, are usually not available. Thus it is more common to measure the total transmission error (TTE) or the orbit of the sun of planetary stages. Especially for planetary gear sets with a sequential mesh phasing, where the torque excitation is quite small compared to other sorts of mesh phasing, it is challenging to implement condition monitoring for planetary stages by using TTE. An alternative to using TTE to monitor the excitation behaviour could be to monitor the sun orbit. In an initial step, the influence on excitation of pitting on is therefore analysed by simulation. The FZG employs a simulation tool called RIKOR3D, which is capable of performing a quasistatic analysis of a whole gearbox, including planetary gear stages. This software is based on RIKOR, a FVA software application, and it calculates the deformations of discrete mesh positions for the whole gear box system. The results of this analysis of a planetary stage are the TTE between input and output as well as the deflections of the different gear wheels.

Original languageEnglish
StatePublished - 2017
Event24th International Congress on Sound and Vibration, ICSV 2017 - London, United Kingdom
Duration: 23 Jul 201727 Jul 2017

Conference

Conference24th International Congress on Sound and Vibration, ICSV 2017
Country/TerritoryUnited Kingdom
CityLondon
Period23/07/1727/07/17

Keywords

  • Excitation behaviour
  • Planetary gear stage
  • Simulation
  • Transmission
  • Transmission error

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