Measurement Technique for Friction Reduction of Engines

Abstract

Friction reduction is strongly required for engines to reduce CO₂ emission. Measurements for factors relating friction losses, which are the shape of sliding surface, temperature, oil film thickness, oil film pressure, and so on, are essential to investigate optimum design of moving parts of engines. Measurement techniques for piston friction, cam friction, bearing friction, shape of sliding surface, oil film thickness, oil film pressure, and so on are described in this paper. It was shown that friction must be measured directly for estimating friction losses of engine moving parts. The remaining subject for such measurements is that for supply oil volume.