Construction of Oil Transfer Model for Prediction of Oil Consumption Mechanism

－Modeling and Verification of Oil Flow under and behind an Oil Control Ring－

Abstract

In order to make clear the oil consumption mechanism of automobile engines, theoretical calculation formulae were proposed for the oil and gas flow in the narrow clearance just under the lower rail of an oil control ring (OCR). Formulae were also proposed for the vertical oil flow on piston lands or on wall in an OCR groove, and for the inflow from the bottom of the OCR groove into drain holes, both of which are induced under the inertia force. Most of them were verified by flow visualization using a test rig, an operating engine, or by the CFD analysis.