Effects of Viscosity of Oil and Anti-wear Agent on Limiting Load for Scoring : Concentrating on FZG Spur Gear Test Results

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 V_s 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 V_s.