Improvement of standardized test methods for evaluating the lubricant influence on micropitting and pitting resistance of case carburized gears

B. R. Höhn, P. Oster, T. Radev, G. Seinberger, T. Tobie

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Micropitting and pitting are typical fatigue failures, which occur on the flanks of highly stressed, case carburized gears. Both failure modes are strongly influenced by the lubricating conditions and lubricant properties. Standardized test methods with defined test conditions are available to evaluate the lubricant performance regarding micropitting and pitting. The FVA-FZG micropitting test is well established as the standard test method for evaluating the micropitting load capacity of gear lubricants, but requires relatively high costs and is quite time consuming. Therefore an efficient and consistent short test method was developed to classify candidate lubricants in terms of their micropitting load capacity analogous to the FVA-FZG micropitting test and to supplement the existing test. The results of the standardized short test method correlate well with the ones of the FVA-FZG micropitting test. Regarding pitting the standard FVA-FZG pitting test is a well known and widely used test method that has proved itself to be suitable to discriminate the pitting load capacity of gear lubricants. In order to improve the practice relevance of the test gears and test results, to reduce the influence of undesired phenomena and to increase the reliability of the results an advanced pitting test procedure was developed. This new test procedure is based on the existing pitting test but uses superfinished test gears with adequate flank modifications. The more suitable test gears will improve the reproducibility of the test results and ensure a closer correlation of the results to practical gear applications. The test also offers the possibility to be extended by additional testing at a 2nd load stage and is seen as an improvement of the existing pitting test method. The paper describes the new developed test procedures and shows basic examples of test results. Furthermore it discusses the correlation and classification to the existing test methods.

Original languageEnglish
Title of host publicationFall Technical Meeting of the American Gear Manufacturers Association 2006
PublisherAmerican Gear Manufacturers Association (AGMA)
Pages84-96
Number of pages13
ISBN (Print)9781604233490
StatePublished - 2006
Externally publishedYes
EventFall Technical Meeting of the American Gear Manufacturers Association 2006, AGMA FTM 2006 - Orlando, FL, United States
Duration: 22 Oct 200624 Oct 2006

Publication series

NameFall Technical Meeting of the American Gear Manufacturers Association 2006

Conference

ConferenceFall Technical Meeting of the American Gear Manufacturers Association 2006, AGMA FTM 2006
Country/TerritoryUnited States
CityOrlando, FL
Period22/10/0624/10/06

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