Abstract
The limiting load for scoring was mainly investigated by means of the FZG spur gear testing machine. As base oil we used five kinds of oil and as anti-wear agent we used Zn-dialkyl-dithiophosphate (ZDTP), which is one commonly used. We found out the effects of viscosity of base oil and the concentration of anti-wear agent on the limiting load for scoring. Furthermore we found out characteristic tendencies of 4-ball test, roller test and crossed helical gear test. All test results were compared with each other. Besides specific wear Vs as a function of concentration of ZDTP was also investigated with various viscosities of base oils. Here we found out an optimum concentration of ZDTP, which causes a minimum specific wear Vs.
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