Abstract
The running-in of cylinder liner-piston rings (CLPRs) is the most important process that must be performed before a marine diesel engine can be operated. The quality of running-in directly affects the reliability of a CLPR. The surface texture of a CLPR has been proven to significantly affect its lubrication performance. In this study, the tribological behavior of a CLPR during running-in is investigated. Three types of surface textures are generated on the CLPR via laser processing: dimple texture on piston rings, groove texture on cylinder liners, and co-texture on both sides. Subsequently, a series of tests are performed on a slice tester. A load of 300 N (1.64 MPa) is applied, and two speeds (50 and 100 rpm) are adopted. The CLPR running-in quality is characterized based on three parameters, i.e., the friction coefficient, contact resistance, and wear topography. Experimental results show that, compared with a non-textured surface, the three types of surface textures mentioned above improved the friction performance during running-in. The lubricant supply capacity of the dimple texture on the piston ring, as a mobile oil reservoir, is stronger than that of the groove texture on the cylinder liner serving as a static oil reservoir. By contrast, the wear resistance of the dimple texture, as a movable debris trap on the piston ring, is weaker than that of the groove texture on the cylinder liner, which serves as a static debris trap. It is demonstrated that the co-texture combines the advantages of dimples and groove textures. Compared with non-textured surfaces, the friction coefficient decreased the most at 100 rpm (44.5%), and the contact resistance improved the most at 50 rpm (352.9%). The coupling effect provides the surface with improved running-in quality by optimizing the tribological performance, particularly at the dead center. This study provides guidance for the tribological design and manufacturing of CLPR in marine diesel engines.
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Acknowledgements
The authors would like to express their sincere gratitudes to the National Natural Science Foundation of China (51422507), Hubei Provincial Natural Science Foundation of China (2018CFB483), and Excellent Dissertation Cultivation Funds of Wuhan University of Technology (2018-YS-041).
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Chenwei MIAO. He received his B.S. degree in marine engineering in 2015 from Wuhan University of Technology, Wuhan, China. He received his M.S. degree in marine engineering in 2020 from Wuhan University of Technology, Wuhan, China. His research interests include surface texturing and tribology of internal combustion engine.
Zhiwei GUO. He received his B.S. degree in mechanical engineering and automation in 2008 from Wuhan University of Technology, Wuhan, China. He received his M.S. and Ph.D. degrees in vehicle utilization engineering from Wuhan University of Technology, Wuhan, China, in 2010 and 2014, respectively. His current position is an associate professor and a Ph.D. supervisor at the School of Energy and Power Engineering, Wuhan University of Technology. His research areas cover tribology and surface interface technology of marine power machinery.
Chengqing YUAN. He received his B.S. degree in chemical engineering in 1998 from Wuhan University of Automobile Technology, Wuhan, China. He received his M.S. degree in mechanical design and theory from Wuhan Material Protection Research Institute, Wuhan, China, in 2001. He received his Ph.D. degree in vehicle utilization engineering from Wuhan University of Technology, Wuhan, China, in 2005. His current position is a professor and a Ph.D. supervisor at the School of Energy and Power Engineering, Wuhan University of Technology. His research areas cover marine power system reliability and green technology.
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Miao, C., Guo, Z. & Yuan, C. Tribological behavior of co-textured cylinder liner-piston ring during running-in. Friction 10, 878–890 (2022). https://doi.org/10.1007/s40544-021-0499-z
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DOI: https://doi.org/10.1007/s40544-021-0499-z