Setembro 2017 vol. 4 num. 1 - XXV Simpósio Internacional de Engenharia Automotiva

Artigo Completo - Open Access.

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DLC COATED RING PACK FOR HEAVY DUTY DIESEL ENGINES

DLC COATED RING PACK FOR HEAVY DUTY DIESEL ENGINES

BRUNO, Rafael Antonio ; RABELLO, Rafael Bettini ; SILVA, Davi Antonio ; ARAUJO, Juliano Avelar ;

Artigo Completo:

Demand for improved fuel efficiency is a must for modern HDD engine developments. Direct contributions from Power Cell Unit (PCU) to reduce mechanical losses are getting close to the technical limit. Going forward improvements are focusing on liners with smoother honing and the use of low viscosity lube oils, which will play an important role in meeting this demand. Moreover, the use of pre/post treatment systems makes the life of the PCU components harder. The focus of the new PCU development is now driven by improved robustness in order to keep the functional aspects even under harsh boundary condition. From the PCU stand point, the ring pack is the most technically challenged sub-system with regards to tribological issues, due to higher wear ratio and scuffing risk. In order to attend to this demand, this paper proposes a novel low friction DLC (diamond-like carbon) coating for piston rings as an enabler to allow the use of low viscosity oils. The DLC coating for rings requires specific features, which differs from the use of DLC for other applications. Thickness, hardness and composition were developed specifically for HDD piston ring application. Rig tests demonstrate outstanding scuffing resistance for DLC piston rings, even combined with very low viscosity oils. The high durability of the developed ring/liner system has been confirmed by engine tests.

Artigo Completo:

Demand for improved fuel efficiency is a must for modern HDD engine developments. Direct contributions from Power Cell Unit (PCU) to reduce mechanical losses are getting close to the technical limit. Going forward improvements are focusing on liners with smoother honing and the use of low viscosity lube oils, which will play an important role in meeting this demand. Moreover, the use of pre/post treatment systems makes the life of the PCU components harder. The focus of the new PCU development is now driven by improved robustness in order to keep the functional aspects even under harsh boundary condition. From the PCU stand point, the ring pack is the most technically challenged sub-system with regards to tribological issues, due to higher wear ratio and scuffing risk. In order to attend to this demand, this paper proposes a novel low friction DLC (diamond-like carbon) coating for piston rings as an enabler to allow the use of low viscosity oils. The DLC coating for rings requires specific features, which differs from the use of DLC for other applications. Thickness, hardness and composition were developed specifically for HDD piston ring application. Rig tests demonstrate outstanding scuffing resistance for DLC piston rings, even combined with very low viscosity oils. The high durability of the developed ring/liner system has been confirmed by engine tests.

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Palavras-chave: diesel engines,

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DOI: 10.5151/engpro-simea2017-35

Referências bibliográficas
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  • [9] Obert, P., Müller, T., Füßer, H.; Bartel, D. “ The influence of oil supply and cylinder liner temperature on friction, wear and scuffing behavior of piston ring cylinder liner contacts - a new model test”. In: Tribology international. - Amsterdam [u.a.]. Elsevier Science, Bd. 94.2016, S. 306-314
  • [10] Wölfle, P., Goergen, F., Füßer, H., Bartel, D. “Einfluss des Prüfprogramms auf die ertragbare Belastung des Reibkontaktes Kolbenring gegen Zylinderlaufbahn im SRVTribomete”r. In: Reibung, Schmierung und Verschleiß ; Bd. 2. - Aachen : GfT; 2015, S. 66/1-66/12
  • [11] López, D., Huegel, R, Nocera, E, Araujo, Juliano, Nascimento, L. “Innovative carbon coating concepts for piston rings”, VDI Conference, 2016.
Como citar:

BRUNO, Rafael Antonio; RABELLO, Rafael Bettini; SILVA, Davi Antonio; ARAUJO, Juliano Avelar; "DLC COATED RING PACK FOR HEAVY DUTY DIESEL ENGINES", p. 462-476 . In: . São Paulo: Blucher, 2017.
ISSN 2357-7592, DOI 10.5151/engpro-simea2017-35

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