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Fuels and lubricants : journal for tribology, lubrication, application of liquid and gaseous fuels and combustion engineering, Vol. 47 No. 2, 2008.

Professional paper

TEST METHODS FOR GEAR LUBRICANTS

Bernd Robert Hoehn ; Gear Research Centre FZG, TU Muenchen
Peter Oster ; Gear Research Centre FZG, TU Muenchen
Thomas Tobie ; Gear Research Centre FZG, TU Muenchen
Klaus Michaelis ; Gear Research Centre FZG, TU Muenchen

Full text: croatian pdf 914 Kb

page 129-140

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Full text: english pdf 556 Kb

page 141-152

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Abstract

Base oil type, oil viscosity, additive type and content have a strong influence on typical gear failures. In general it is not possible to quantify the lubricant influence on load carrying capacity simply from the knowledge of physical or chemical oil data. Therefore many test methods were developed for the evaluation of mechanical-technological lubricant properties. Simple low-cost bench test methods often show poor correlation with practice. From experience and systematic investigations it can be shown that testing of gear lubricants can adequately be performed only in gear test rigs using specified test gear geometry [1].
In continuous work over many years the standard FZG back-to-back gear test rig was developed and improved for different types of gear failure simulation. The standard FZG oil test A/8,3/90 is widely used for the evaluation of the scuffing properties of industrial gear oils. Automotive gear oils of GL4 level can be tested in the step test A10/16.6R/90, axle oils of GL5 level in the shock test S-A10/16.6R/90. For the slow speed regime the wear test C/0.05/90:120/12 can be applied. The influence of lubricants on the micropitting performance of gears can be evaluated in a screening short test GFKT-C/8,3/90 or in the full micropitting test GF-C/8,3/90. Different pitting tests are available as single stage test PT-C/9:10/90 or application test PTX-C/SNC/90.
The aim of the paper is to describe the influence of the lubricant on the different failure modes in gears, how to quantify this influence in adequate test methods and how to introduce the results of such tests as “strength values” for the lubricant into load carrying capacity rating methods.

Keywords

lubricant rig testing methods; gear lubricants; FZG gear lubricants testing rig

Hrčak ID:

23964

URI

https://hrcak.srce.hr/23964

Publication date:

30.4.2008.

Article data in other languages: croatian

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