Comparative study on the friction behaviour of piston/bore interface technologies

Josef Edtmayer, Siegfried Lösch, Hannes Hick, Simon Walch

Research output: Contribution to journalArticlepeer-review


Engine crank case designs for passenger car applications are based today on two main material technologies: grey cast iron
and an increasing share of aluminium-based concepts. Due to the low wear resistance of aluminium, the latter concepts
require a wear protective layer for the cylinder bore surface. Iron-based thermal spray coats are widely used for this purpose.
The coating improves the tribological behaviour significantly, as previous studies have shown. Additionally, aluminium-based
concepts offer advantages regarding engine weight and thermal management. The aim of the presented work was the discussion
of these technological concepts regarding the tribological and sealing properties of the piston/bore interface. The study
was carried out based on the AVL FRISC Floating Liner Engine. While the basic engine remained unchanged, the cylinder
bore surface was varied. In addition to the floating liner friction measurement, the blow-by and lube oil consumption were
also measured. A state-of-the-art multi-body dynamic simulation model complements the experimental study, while both
simulation and measurement lead to similar conclusions.
Original languageEnglish
Number of pages9
JournalAutomotive and Engine Technology
Issue number3
Publication statusE-pub ahead of print - 2019

Fields of Expertise

  • Mobility & Production

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