Effect of Surface Temperatures in Extreme Pressure Lubrication

Abstract

This paper considers surface temperatures in extreme pressure lubrication. The EP failure temperatures are estimated utilizing Shell-4 Ball machine for five sulfur and two chlorine compounds. It is shown that EP film failure can be considered to occur at a constant critical temperature. Also the estimated surface temperatures are utilized to develop a different model for EP lubrication failure. Analysis of the temperature problem indicated that EP films are not insulating and evidence to this effect under dynamic conditions is presented utilizing electrical contact potential measurements. Finally a brief consideration is given to the possible elasto-hydrodynamic effects under certain conditions.