Optimal choice of gear lubricant in regard to different tribological parameters
Zafošnik, Boštjan ; Fajdiga, Gorazd ; Flašker, Jože
It is very important to choose the right lubricant for gearboxes and with that to minimise the friction and loss of power. The most important parameter of the lubrication is oil viscosity. Different ...lubricants have different viscosity, which also change with temperature and applied pressure. A computer system was set up to determine the optimum viscosity and quality of the oil lubricants. Optimum oil viscosity is estimated in regard to the minimal lubricant film thickness, proposed by Downs and Higginson EHD theory, temperature according to DIN 3990, and surface roughness. The oil viscosity and surface roughness are iterative determined considering also geometrical and operational data of gears. The method provides the relative lubricant film thickness, which is satisfactory for engineering practice. The oil quality is also a very important parameter and is determined in regard to the FZG test results taken from DIN 3990. By using the program for oil viscosity and quality optimisation, one can easily estimate the optimum viscosity in regard to the minimum lubricant film thickness, temperature and surface roughness, and which load case should the oil cary by FZG test.
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