Failure analysis of cooling fan gearbox

► We investigated pitting and cracking of cooling fan gear box. ► Analyses showed that the gears failed by contact fatigue accelerated by alternating high loads. ► Gears’ corrosion due to lack and contamination of lubrication. ► Explained contact fatigue mechanism in helical gears. ► Corrosion may c...

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Bibliographic Details
Published in:Engineering failure analysis 2012-03, Vol.20, p.166-172
Main Authors: Al-Meshari, A., Al-Zahrani, E., Diab, M.
Format: Article
Language:English
Subjects:
Contact
Cooling
Corrosion
Crack propagation
Failure analysis
Fatigue
Fatigue failure
Fatigue tests
Gear
Gearboxes
Gears
Lubricant
Steel
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Summary:► We investigated pitting and cracking of cooling fan gear box. ► Analyses showed that the gears failed by contact fatigue accelerated by alternating high loads. ► Gears’ corrosion due to lack and contamination of lubrication. ► Explained contact fatigue mechanism in helical gears. ► Corrosion may contribute to crack initiation. This article describes the findings of an investigation on the failure of a cooling fan gearbox. The failure analysis was aimed at identifying the root cause of the gear damage in order to prevent their reoccurrence. Detailed investigation using several characterisation techniques such as visual and metallographic examinations, hardness testing, and different chemical analyses showed that the gears failed by contact fatigue accelerated by alternating high loads. The failure contributing factors are discussed and identified. Practical corrective actions were suggested in order to avoid similar failures.
ISSN:1350-6307
1873-1961
DOI:10.1016/j.engfailanal.2011.11.009