DGMK-Forschungsbericht 575: Untersuchungen zum einfluss von lastspielzahl und schmierungsart auf die graufleckentragfähigkeit bei der prüfung von schmierstoffen

The FVA-FZG-micro-pitting test is well established as the standard test method for evaluating the micro-pitting characteristics of lubricants used in gear drives. The DGMK-FZG micro-pitting short test GFKT-C/8,3/90 was developed and tested with lubricants, whose classification in the standard FVA-FZG-micro-pitting test is well known. The new DGMK-FZG micro-pitting short test categorizes candidate lubricants in classes of micropitting load capacity analogous to the FVA-FZG-micro-pitting test. These classes correlated well with the classes of the FVA-FZG-micro-pitting test. With regard to the general tendency, the average maximum profile deviation after running the DGMK-FZG micro-pitting short test decreased with increasing micro-pitting load capacity of the oil according to the FVA-FZG-micro-pitting test. The correlation between the average maximum profile deviation after running the DGMK-FZG micro-pitting short test and the failure load stage of the FVA- FZG micro-pitting test was good. Consequently, the DGMK-FZG micro-pitting short test, as a supplementation to the available standard FVA-FZG-micro-pitting test, represents a standardized short test method, which is qualified for the differentiation of various candidate lubricants in terms of their micro-pitting load capacity.