Study on the Scoring Resistance of Lubricating Oil in Two Cylinder Test : 1st Report, Temperature Rise of Cylinder

Abstract

In this paper, as the basic study to clarify the scoring resistance of lubricating oil in Two Cylinder test, temperature rise of cylinder was analyzed by both theoretical methods and the Method of Weighted Residuals, and the effects of various factors on the temperature rise of cylinder were examined by numerical calculations. Unlike the temperature rise of steel ball in Four Ball test, temperature rise of cylinder cannot be divided into two kinds of components with different properties without regard to rotating speed. However, an important item i the evaluation of thermal resistance of lubricating film is the outer surface temperature of cylinder. As the result of examination, it is made clear that in heat supply region and in its neighborhood the temperature rise on the outer surface of cylinder can be divided into two components. One is flash temperature and the other bulk temperature rise. The former is affected by the size of heat supply region, rotating speed, and heat source distribution, and in dimensionless rotating speed ω^^->500< by contact width in axial direction. The latter is affected by the coefficient of heat transfer, rotating speed, and contact width in axial direction.