INFLUENCE OF OIL VISCOSITY, CHEMICAL OIL STRUCTURE, AND CHEMICAL ADDITIVES ON FRICTION LOSS OF SPUR GEARS (CONCERNING THE INFLUENCE OF SYNTHETIC OIL AND MINERAL-OIL)

The friction loss of gears and its quantitative estimation are importa nt problems because of their relevance to energy conservation and load -carrying capacity. Recent research results do not provide satisfactor y estimates of friction loss of spur gears. Therefore, the authors car ried out experiments to study the influences of lubricating oil viscos ity and additives, as well as base oil type and load and rotational sp eed on friction loss of spur gears. Base oil types used were paraffin mineral, poly-alpha-olefin, and polyglycol with several oil viscositie s. An EP and a mild EP additive were studied in these oils. Finally, t he temperature rise of teeth of gears as a function of friction power loss was investigated, and an empirical fomula for calculating the tem perature rise of the spur gear teeth was derived.