Setembro 2025 vol. 12 num. 1 - XXXII Simpósio Internacional de Engenharia

Trabalho completo - Open Access.

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Uso de anéis de pistão revestidos por PVD e DLC em motores Diesel agrícolas

Use of PVD and DLC piston rings on agricultural Diesel Engines

TOMANIK, Eduardo ; XIAOCHAO, He ; BANG, Liu ;

Trabalho completo:

Aplicações agrícolas vão usar motores de combustão interna ainda por um longo tempo. Especialmente em pequenas fazendas, manutenção e operação do motor são muitas vezes sub ótimas. Robustez e baixo custo de operação são mandatórios para aceite no mercado e satisfação dos usuários. Introdução de novas tecnologias contribuem para redução do consumo de combustível e emissões, mas precisam ser custo efetivas. Até recentemente, anéis de pistão, de baixo atrito, revestidos por PVD (?Physical Vapor Deposition?) e DLC (?Diamond Like Carbon?) eram aplicados apenas em modernos motores diesel ?Heavy Duty?. Otimização do processo de revestimento de PVD e a demanda por motores mais eficientes, tornaram viável o uso destes anéis em pequenos motores agrícolas. Este artigo descreve testes de desenvolvimento em um motor Diesel, 3.6 litros, turbocomprimido, com DPF. Motores similares são oferecidos mundialmente, inclusive no Brasil. Após 1000 h de teste dinamométrico, o desgaste dos anéis foi extremamente baixo, 1.0 µm para o 1º anel com PVD, e menor que a capacidade de medição para o anel de óleo com DLC. 

Trabalho completo:

Agricultural machinery will use internal combustion engines for a long time. Robustness and low operation costs are mandatory for market acceptance and user satisfaction. New engine technologies contribute to reducing fuel consumption and emissions, but need to be cost-effective. Until recently, PVD (Physical Vapor Deposition) and DLC (Diamond Like Carbon) low-friction rings were applied only on more advanced and large HDD Engines. Recent optimizations for PVD and DLC coating processes and the need for more fuel-efficient engines made such advanced rings viable on small, cost-competitive, diesel engines. This article describes the use of PVD top and DLC oil rings on a 3.6-liter Diesel Engine for agricultural use, 129 kW, turbocharged, EGR and DPF equipped. After 800-hour durability test, the piston ring radial wear was extremely low, only 1.0 ?m on the PVD top ring and negligible for the DLC oil ring. Wear on the cylinder liner was also very low. At the end of the test, cylinder honing marks are still present, engine performance and emissions are nearly identical to those at the test?s start, demonstrating that the use of advanced tribological solutions can significantly contribute to emissions mitigation in agricultural engines.

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DOI: 10.5151/simea2025-PAP75

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Como citar:

TOMANIK, Eduardo; XIAOCHAO, He; BANG, Liu; "Uso de anéis de pistão revestidos por PVD e DLC em motores Diesel agrícolas", p. 375-382 . In: Anais do XXXII Simpósio Internacional de Engenharia. São Paulo: Blucher, 2025.
ISSN 2357-7592, DOI 10.5151/simea2025-PAP75

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