A NEW TEST FOR THE QUALITATIVE AND QUANTITATIVE DISCRIMINATION BETWEEN AUTOMOTIVE TRANSMISSION AND AXLE OILS
Journal Title: Tribologia - Year 2013, Vol 251, Issue 5
Abstract
In this work, the authors analyse the possibility of using a new test method, called the method for the determination of the limiting pressure of seizure poz, to differentiate between the API GL performance levels of automotive transmission and axle oils from the point of view of their EP properties. The new test is performed under conditions of the scuffing of the four-ball tribosystem, initiated by the linearly increasing load, until seizure occurs. In numerous publications, it has been shown that the new test has many pros in comparison with standardised tests used for the assessment of extreme-pressure (EP) properties of lubricants. It exhibits a better resolution and is quicker, cheaper, and its precision is comparable to the precision of the standardised tests of EP properties of lubricants. A representative group of the automotive gear oils of the API GL-1 to GL-5(LS) performance level was tested using a four-ball tribotester with the sliding tribosystem. It has been shown that the method for the determination of the limiting pressure of seizure poz makes it possible to differentiate between most of the API performance levels of the automotive gear oils – both qualitatively (i.e. by the analysis of the friction torque curves) and quantitatively (on the basis of poz values); although, the qualitative way is more effective (better resolution) than the quantitative one. Because the new test method reduces the cost (simple, inexpensive test specimens) and the duration of the testing, it can be applied in R&D industrial labs to verify the quality of automotive gear oils.
Authors and Affiliations
Waldemar TUSZYŃSKI, Marian SZCZEREK, Edyta OSUCH-SŁOMKA
Keywords
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