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Improvement of friction performance of cylinder liner surface with composite lubrication texture under fluid lubrication condition |
FAN Yujie, HAO Mengjie, CHEN Yuzhe, XIA Jing, LI Bin |
School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China |
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Abstract In order to improve the surface friction performance of the cylinder liner, the YTRC2110D diesel engine was used as the research object, and a composite lubrication structure was designed in the fluid lubrication area of the cylinder liner. Based on friction tests, the friction performance and wear mechanism of the composite lubrication structure responsible for improving the surface of the cy-linder liner under lubrication conditions were discussed, and the composite lubrication structure with the best performance was found. The results show that under fluid lubrication conditions, the composite lubrication structure possesses better friction reduction performance than that of a single micro-texture. Compared with smooth surfaces, the average friction coefficient of a single micro-textured surface decreases by 32.86%, the wear quality only decreases by up to 9.6%, the maximum decrease in surface roughness Sa is only 16.57%, and the fractal dimension D increases by only 4.67%. The surface wear area is mainly shallow plowed, accompanied by a small amount of deep plowing. The average friction coefficient of the surface of the composite lubricating structure decreases by 42.2%, the wear quality is reduced by up to 17.6%, the maximum wear surface roughness Sa decreases by 26.86%, and the fractal dimension D increases by 8.77%. The contact surface of the composite lubrication structure is affected by the dynamic pressure oil film and the molybdenum disulfide transfer film, and only a small amount of shallow plowing is produced on the worn surface. This provides a theoretical basis for improving the friction performance of the cylinder liner surface.
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Received: 08 February 2023
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