0739 ピストンリング部の潤滑・熱伝達に及ぼすリング形状の影響(S44-2 燃料および潤滑技術(2),S44 燃料および潤滑技術)

Abstract

In this study, for the clarification of the lubrication and thermal problems between ring and liner of internal combustion engines, an unsteady thermohydrodynamic lubrication model considering the ring temperature and the ring movement in the piston ring groove was developed. Then using the method of thermohydrodynamic lubrication, the effect of the geometry of top ring on the lubrication such as the oil film thickness and friction loss and heat transfer was analyzed. The ring temperature on the sliding surface shows the characteristic temperature distribution, and that temperature difference of ring between ring upper face and middle of ring has about 10℃. The oil film thickness changed in a cycle decreases with decrease of ring width. The friction mean effective pressure and the heat transfer on the ring sliding face decrease with decrease of the ring width.