Friction Response of Piston Rings for Application-like Starvation and Benefit of Amorphous Carbon Coatings
Source abstract
Abstract
The oil supply at the interface between the top ring and the cylinder liner (TRCL) plays a major role in an internal combustion engines efficiency. In particular, the interface forms a trade-off between the serving of enough lubricant for sufficient lubrication conditions and emissions through subsequent combustion. This can lead to deficient top ring lubrication conditions. In this study, a new developed reciprocating long-stroke tribometer, enabling the variation of oil supply, is used to investigate such application-like starved lubrication conditions of the TRCL interface. With the simulative investigations, a comparison with the fired engine is possible. The performance of diamond-like carbon coatings is compared to standard nitrided piston rings. It was found that the tetrahedral amorphous carbon (ta-C) coatings exhibit up to 31% reduced friction as well as a lower wear under starved lubrication conditions. Simulative investigations show a good correlation between engine friction and tribometer measurements for selected oil supply conditions.
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Research context
OpenAlex topics: Tribology and Lubrication Engineering · Lubricants and Their Additives · Diamond and Carbon-based Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Steinbeis-Innovationszentrum Werkstoff- und Oberflächentechnologie, Spatenstraße 18, 88046 Friedrichshafen, Germany
Steinbeis-Transferzentrum Werkstoffe Korrosion und Korrosionsschutz GmbH, Spatenstraße 18, 88046 Friedrichshafen, Germany
AVL Deutschland GmbH, Frankfurter Ring 213, 80807 Munich, Germany
BMW Group Motorcycles, R&D Efficient Dynamics, Hufelandstraße 20, 80939 Munich, Germany
Fraunhofer Institute for Material and Beam Technology IWS, Winterbergstraße 28, 01277 Dresden, Germany
Institute of Manufacturing Technology, Faculty of Mechanical Engineering, Technische Universität Dresden, George-Bähr-Straße 3c, 01069 Dresden, Germany
Funding
Federal Ministry for Economic Affairs and Climate Action
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