Efficiency improvement in automobile bucket tappetcamshaft contacts by DLC coatings – Influence of engine oil, temperature and camshaft speed.pdfVIP

Efficiency improvement in automobile bucket tappetcamshaft contacts by DLC coatings – Influence of engine oil, temperature and camshaft speed.pdf

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Efficiency improvement in automobile bucket tappetcamshaft contacts by DLC coatings – Influence of engine oil, temperature and camshaft speed.pdf

Surface Coatings Technology 308 (2016) 360–373 Contents lists available at ScienceDirect Surface Coatings Technology journal homepage: /locate/surfcoat Ef?ciency improvement in automobile bucket tappet/camshaft contacts by DLC coatings – In?uence of engine oil, temperature and camshaft speed L. Dobrenizki a, S. Tremmel a, S. Wartzack a, D.C. Hoffmann b, T. Br?gelmann b,?, K. Bobzin b, N. Bagcivan c, Y. Musayev c, T. Hosenfeldt d a Engineering Design, Friedrich-Alexander-Universit?t Erlangen-Nürnberg (FAU), Martensstr. 9, 91058 Erlangen, Germany b Surface Engineering Institute, RWTH Aachen University, Kackertstr. 15, 52072 Aachen, Germany c Schaef?er AG, Competence Center Surface Technology, Industriestr. 1-3, 91074 Herzogenaurach, Germany d Schaef?er AG, Corporate Innovation, Industriestr. 1-3, 91074 Herzogenaurach, Germany article info Article history: Received 24 April 2016 Revised 21 July 2016 Accepted in revised form 6 September 2016 Available online 20 September 2016 Keywords: Valve train Bucket tappet/camshaft contact Friction test-rig DLC PVD coating Friction Wear Motor oil Additives ZDDP MoDTC GMO Tribo-chemical reaction layer Raman analysis XPS analysis abstract With the aim to ful?ll legal regulations concerning energy ef?ciency and greenhouse gas emissions, diamond-like carbon (DLC) coatings are increasingly used on highly stressed components of internal combustion engines to reduce friction and prolong component lifetime. The valve train is one of a key system of the combustion engine considerably contributing to frictional losses, especially under boundary and mixed lubrication conditions at lower crankshaft speeds. In this regard, the tribological contact bucket tappet/camshaft offers high potential for friction reduction but imposes high demands on DLC coatings due to highly complex kinematics and repetitive loads depending on the cam contours and the camshaft angle and speed. The aim of this work was to analyze the in?uence of DLC coatings on the f

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