Failure Analysis on Input Gear of a Gearbox

DOI

10.2991/icmse-18.2018.36How to use a DOI?

Keywords

Helical gear; Fatigue; Helicopter, Rould angle

Abstract

A tooth of the input helical gear of an intermediate gearbox in a helicopter fractured during testing. In order to find out the failure mode and cause, macro and micro observation, hardness and carburized depth testing, microstructure examination, surface roughness and round angle testing were carried out. The results show that the failure mode of the gear is fatigue failure . The crack initiated from the round angle of the tooth root at the working-face side. The round angle radius is smaller than the requried value, leading to the increase of stress concentration, which is the main cause for the fatigue fracture of the tooth. The machining process of the round angles should be concisely controlled so that such failure can be avoided.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Changkui Liu
AU  - Bing Zhang
AU  - Xing Chen
PY  - 2018/05
DA  - 2018/05
TI  - Failure Analysis on Input Gear of a Gearbox
BT  - Proceedings of the 2018 8th International Conference on Manufacturing Science and Engineering (ICMSE 2018)
PB  - Atlantis Press
SP  - 181
EP  - 186
SN  - 2352-5401
UR  - https://doi.org/10.2991/icmse-18.2018.36
DO  - 10.2991/icmse-18.2018.36
ID  - Liu2018/05
ER  -