Abstract
It is hypothesized that structured sliding-surfaces improve the lubrication condition by forming an oil sump on the sliding surface, redistributing the oil, and trapping wear debris. For these reasons, structured sliding-surfaces have been used as a friction reduction method for a long time. In this work, effects of microstructure laid on the cylinder liner of an internal combustion engine on twin-land oil control ring (TLOCR) and piston skirt lubrication condition were investigated by comparing friction between a conventional fine-honed liner (CFL) and a micro-structured liner with the CFL. The measurements using a floating liner engine showed that the microstructure improved lubrication condition by reducing hydrodynamic friction. On the other hand, it was also observed that the microstructure could result in elevated friction under certain engine operating conditions.Graphical Abstract
Highlights
Downsizing the internal combustion engines to meet the fuel-consumption and CO2 regulations results in higher thermal load in the engines
Effects of microstructure laid on the cylinder liner of an internal combustion engine on twin-land oil control ring (TLOCR) and piston skirt lubrication condition were investigated by comparing friction between the conventional fine-honed liner (CFL) and the microstructured liner (MSL) which was made based on the CFL
On the contrary, when the lubrication condition transitions to the hydrodynamic lubrication regime, the friction increases with the piston speed, and the friction in which the middle of the stroke shapes like a bow is shown
Summary
Downsizing the internal combustion engines to meet the fuel-consumption and CO2 regulations results in higher thermal load in the engines. These operating conditions put the sliding parts, in particular pistons and piston rings, under harsh lubrication condition. Piston ring pack and piston skirt are the major contributors of mechanical losses in internal combustion engines [1]. The piston ring pack in a passenger car engine generally consists of three rings namely, the top ring, the second ring, and the oil control ring. The second ring usually combines both function of gas sealing and controlling of lubrication oil. Oil control ring can contribute over 50% of the piston ring pack friction [5]. The geometric relationship between the TLOCR contact face and the roughness of the cylinder liner surface is important when focusing on the TLOCR’s lubrication condition [6, 7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
