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Development of a Nitrided Ring Pack for Medium and Heavy-duty Diesel Engines
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English
Abstract
Recent developments of diesel engines have aimed the improvement of their durability as well as cost optimizations. Although these tendencies seem to be contradictory, many technologies have been applied with results that are very satisfactory. The development of components, specially the piston rings, has led to solutions with optimized performance of service life as well as of functional characteristics of oil consumption control, blow-by control and friction reduction.
The use of nitrided piston ring packs allows the maximization of the system performance without compromising the cylinder bore wear, as the tribological pair is very compatible.
This paper presents the results of tests with nitrided first and second groove rings for medium and heavy-duty diesel engines. The wear results of the rings and the cylinder bore and their functional behavior are analyzed, showing that the nitrided steel ring in the first groove and the nitrided cast iron ring in the second groove are viable alternatives to replace the conventional ring packs (with moly and chrome coated rings) in these engines.
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Authors
Citation
Demarchi, V., Rombaldi, G., Sanles, S., and Rey, H., "Development of a Nitrided Ring Pack for Medium and Heavy-duty Diesel Engines," SAE Technical Paper 962377, 1996, https://doi.org/10.4271/962377.Also In
References
- Tomanik, E. Demarchi, V. Vatavuk, J. “Nitrided Steel Piston Rings for Internal Combustion Engines” SAE paper 942394 1994
- Demarchi, V. Vatavuk, J. “Nitrided Gray Cast Iron Piston Rings” SAE paper 942393 1994
- Demarchi, V. Tomanik, E. “Nitrided Piston Ring Pack for Diesel Engines” SAE paper 952249 1995
- Demarchi, V. “Influence of Top Ring Lower Peripheral Edge Chafer on Blow-by and Oil Consumption” Engine Design International 94 49 51 1994
- Tomanik, E. Silveira S., R.M. Zecchinelli, R. “Influence of Top Ring Gap Types at Blow-by of Internal Combustion Engines” SAE paper 931669 1993