The lubrication regimes experienced by piston rings vary from full film hydrodynamic in the mid-stroke positions to mixed or boundary at the ends of the stroke. Full analyses of the mixed lubrication of piston rings have been made, but this work uses a simplified approach to analyse lubrication and friction in a modern automotive ring pack. The ring pack analysed in the work was from a current automotive engine with dimensions 90 mm diameter x 71 mm. The top ring is a barrel faced chrome plated compression ring, the second ring a tapered Napier scraper ring and the oil control ring is in three pieces, two chrome plated steel rails with a spring steel expander. This work makes approach to the determination of mixed friction based on a representation of the Stribeck curve. Predictions for friction show good correlation with test measurements, showing that the simplified analysis is useful and that the simplifications are justified.
Analysis of friction in a modern automotive piston ring pack
Analyse der Reibung in einer modernen Kolbenring-Anordnung im Automobil
1995
11 Seiten, 17 Bilder, 3 Tabellen, 11 Quellen
Conference paper
English
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