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An Analysis of Oil Film Thickness and Heat Transfer on a Piston Ring in Consideration of Temperature and Movement of Ring: Second Report
Technical Paper
2007-08-0280
Sector:
Event:
JSAE Spring Conference
Language:
Japanese
Abstract
In this study, for the clarification of the lubrication and thermal problems between ring and liner, 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 profile of top ring sliding face on the oil film thickness and friction losses was analyzed. The ring temperature on the sliding surface shows the temperature distribution, and that temperature difference of ring between ring lower face and middle of ring has about 19°C. The oil film thicknesses changed in a cycle increase with increase of barrel height. The friction mean effective pressure FMEP decreases with increase of the barrel height. FMEP of the barrel face ring is more effective than that of the flat face ring.