This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Effect of Diamond-Like Carbon Coating on Anti-Scuffing Characteristics of Piston Pins
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
It has been proposed that downspeeding combined with high boost levels would effectively reduce fuel consumption in heavy-duty diesel engines. Under low-speed and high-boost operating conditions, however, the in-cylinder gas pressure, which acts on the piston crown, is greater than the piston inertia force (such that there is no force reversal), over the entire range of crank angles. Therefore, the piston pin never lifts away from the main loading area (the bottom) of the connecting rod small-end bushing where the contact pressure against the piston pin is highest. In such operating conditions, lubricant starvation is easily induced at the interface between the piston pin and small-end bushing. Through carefully devised engine tests, the authors confirmed that the piston pin scuffing phenomenon arises when the boost pressure exceeds a critical value at which the no-force reversal condition appears. Furthermore, to prevent this piston pin scuffing when there is no force reversal, the authors applied a type of diamond-like carbon (DLC), a hydrogenated tetrahedral amorphous carbon (ta-C:H) coating, to the piston pins and then evaluated its anti-scuffing characteristics in a multi-cylinder engine. The coated piston pins exhibited greatly superior anti-scuffing characteristics relative to the uncoated pins, while preventing the transfer of layers of the bushing material onto the coated piston pins. The authors hypothesize that the prevention of the transfer of layers of bushing material is one of the most important factors leading to the superior anti-scuffing characteristics of the DLC-coated piston pins.
CitationUsui, S., Kato, H., Nakajima, H., and Shimokawa, K., "Effect of Diamond-Like Carbon Coating on Anti-Scuffing Characteristics of Piston Pins," SAE Technical Paper 2019-01-0184, 2019, https://doi.org/10.4271/2019-01-0184.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Unnamed Dataset 3|
- Bergmann , D. , Naganawa , A. , Eichler , K. , and Marten , C. Efficiency Increase of Commercial Powertrains MTZ 44 50 2017
- Donnet , C. and Erdemir , A. Tribology of Diamond-Like Carbon Films: Fundamentals and Applications Springer US, Springer-Verlag US 2008 411 413 10.1007/978-0-387-49891-1
- Podgornik , B. , Jacobson , S. , and Hogmark , S. DLC Coating of Boundary Lubricated Components-Advantages of Coating One of the Contact Surfaces Rather than Both or None Tribology International 36 11 843 849 2003
- Kano , M. Diamond-Like Carbon Coating Applied to Automotive Engine Components Tribology Online 9 3 135 142 2014 10.2474/troll.9.135
- Higuchi , T. , Mabuchi , Y. , Ichihara , H. , Murata , T , et al. Development of Hydrogen Free DLC Coating for Piston Ring JSAE Proceedings 154 11
- Morgenstern , R. , Kiessling , W. , and Reichstein , S. Reduced Friction Losses and Wear by DLC Coating of Piston Pins Proceedings of the ASME ICES2008 Chicago 2008 10.1115/ICES2008-1650
- Etsion , I. , Halperin , G. , and Becker , E. The Effect of Various Surface Treatments on Piston Pin Scuffing Resistance Wear 261 7-8 785 791 2006 10.1016/j.wear.2006.01.032
- Ferrari , A.C. and Robertson , J. Interpretation of Raman Spectra of Disordered and Amorphous Carbon Physical Review B 61 20 14095 14107 2000 10.1103/PhysRevB.61.14095
- Oshiro , T. , and Miyake , H. Friction Properties of Hydrogenated Tetrahedral Amorphous Carbon (Ta-C:H) Film in MoDTC-Containing Oil Proceedings of JAST:C17, Fall 2018
- Booser , E.R. CRC Handbook of Lubrication 204 CRC Press 1984 9780849320958