A Study on the Oil Film Thickness on the Lower Side Surface of the Oil Ring of a Gasoline Engine

Abstract

Oil film thickness on a side surface of a lower rail of an oil ring was measured to clarify the mechanism of engine oil consumption. Two optical fibers were embedded in the lower side surface of the oil ring groove, and oil film thickness was measured by laser induced fluorescence method. It was found that the waveforms of the oil film thickness showed some patterns. Those waveforms were compared with inertial force, pressure at around the oil ring and so on, and the reason of the waveform of each cycle was discussed.