In this experimental examination the frictional behaviour of 19 synthetic lubricants was systematically investigated in a twin disc machine as a function of load, sliding speed and oil temperature. Additional power loss measurements were made in an FZG back-to-back gear test rig, varying load, speed and temperature. From these measurements the mean coefficient of friction in the twin disc contact area and in the gear mesh could be calculated and compared. The comparative investigations led to a calculation method to predict gear mesh friction and power loss from relatively simple and inexpensive twin disc results. The different test methods and the results for some selected lubricants are shown. Using a mineral oil and synthetic gear oil in comparison the measured and calculated power loss values of an industrial gear box with one bevel gear stage and two spur gear stages are discussed.
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