Abstract
Abstract. The tribological properties of the cylinder liner are of great significance in reducing energy loss from an internal combustion engine's system. In order to improve the antiwear performance of the cylinder liner at top dead center (TDC), the friction and wear of the honed cylinder liner during the running-in process are investigated. Using a UMT TriboLab multifunction friction wear tester, the coefficients of friction (COFs) are analyzed under different lubrication conditions and loads, and the surface roughness and profile of the cylinder liner are obtained using a three-dimensional (3D) laser scanning confocal microscope (LSCM). The COF, roughness and surface profile are compared in order to investigate the variation in tribology parameters under different operating conditions. To monitor the COF in real time, it is predicted using the polynomial fitting method. It is shown that the COF decreases with an increase in the lubrication oil and load and that the surface profile more easily becomes smooth under dry (lubrication) conditions; this can effectively shorten the operation time during the running-in process. The polynomial fitting method can achieve an assessment of the COF with a very small standard error.
Highlights
As the main equipment of large ships and power generation systems, the development prospect of internal combustion engines (ICEs) has attracted great attention in recent years
The piston ring–cylinder liner (PRCL) system is one of the most important parts of high-performance ICEs, and the energy loss caused by friction and wear of the PRCL accounts for more than 50 % of the total energy loss, greatly reducing the power conversion efficiency and service performance of ICEs (Tomanik et al, 2018; Biberger et al, 2017)
In order to reduce friction and wear, calcium sulfonate and an organic antiwear additive have been blended into lubricant to study the wear of the PRCL system, and a large-scale friction film has been produced on the contact surface (Burkinshaw et al, 2013)
Summary
As the main equipment of large ships and power generation systems, the development prospect of internal combustion engines (ICEs) has attracted great attention in recent years. In order to improve the energy conversion efficiency and to reduce emissions, the antifriction and antiwear technology as well as the tribological characteristics of the PRCL system have become a hotspot and nodus in engine design and manufacture. The tribological characteristics of the PRCL system are linked with factors such as lubrication, material, surface quality and coatings. Lubrication can effectively reduce friction and wear, and many scholars have investigated lubrication characteristics in order to improve the antiwear performance of the system. In order to reduce friction and wear, calcium sulfonate and an organic antiwear additive have been blended into lubricant to study the wear of the PRCL system, and a large-scale friction film has been produced on the contact surface (Burkinshaw et al, 2013).
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