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Power cylinder unit for medium & heavy duty diesel engines for emergent markets
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
In a Diesel engine, temperature reduction on a power cylinder unit (PCU) is an important demand due to increasingly engine load and performance of modern engines. Both piston and piston ring pack need to be prepared to attend this demand.
In general, Diesel engine pistons use cooling galleries to remove heat from high temperature regions and, therefore, reduce tensions on piston combustion bowl and bowl rim. Piston concept gallery was designed to improve piston performance: it consists on more efficient heat dissipation through an elevation of the gallery and new shape. The elevated piston promoted a temperature reduction of 39°C in the maximum temperature region without compromising product robustness and, thus, an improvement on lifetime prediction in 2 times in the piston combustion bowl region. Furthermore, a reduction on carbon build-up on ring belt region was also observed.
In parallel to the temperature and carbon build-up reduction, modern engines demand an improvement of lube oil and fuel consumption. Short- and long-term better results are achieved through piston ring pack design changes: top rings with reduced axial width and tangential load, 2nd rings made of nitride cast iron and smaller width bottom chamfers and oil-rings with reduced ring and land widths and high conformability and reduction of tangential load. These improvements are direct related to ring pack friction reduction both through area and load decrease and better oil scraping efficiency. Engine performance improvements achieved through PCU parameters combination.
CitationMarinho, G., Tanigava, R., Dezotti, R., and Nocera, E., "Power cylinder unit for medium & heavy duty diesel engines for emergent markets," SAE Technical Paper 2018-36-0133, 2018, https://doi.org/10.4271/2018-36-0133.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
- Nocera, E., Bruno R.A., Silva, D. and Bieneman, J., “High Durability and Low Fuel Consumption Ring Pack for HDD Engines”, SAE Technical Paper 2013-01-1725, doi: 10.4271/2013-01-1725.
- MAHLE GmbH, “Kolben und motorische Erprobung”, second edition, ISBN-13: 978-3834814524
- Mierbach, A. et al., Heat Flow Through Piston Rings and its Influence on Shape”, 1983, SAE Paper 831283.
- Handbook of Hard Coatings, Rointan F Bunshah, Publication, 2001
- Chen, Y., Deck, C. L., “Accurate Specific Fuel Consumption Measurement and its Application on Piston Friction Reduction for a Heavy-Duty Diesel Engine”, ASME Technical Paper ICEF2011-60219. ASME 2011 Internal Combustion Engine Division Fall Technical Conference, Morgantown, West Virginia, USA, October 2–5, 2011. Pp. 1053–1057. ISBN: 978-0-7918-4442-7.