Abstract
It is of a vital importance to reduce the frictional losses in marine diesel engines. Advanced surface textures have provided an effective solution to friction performance of rubbing pairs due to the rapid development of surface engineering techniques. However, the mechanisms through which textured patterns and texturing methods prove beneficial remains unclear. To address this issue, the tribological system of the cylinder liner-piston ring (CLPR) is investigated in this work. Two types of surface textures (Micro concave, Micro V-groove) are processed on the cylinder specimen using different processing methods. Comparative study on the friction coefficients, worn surface texture features and oil film characteristics are performed. The results demonstrate that the processing method of surface texture affect the performance of the CLPR pairs under the specific testing conditions. In addition the micro V-groove processed by CNCPM is more favorable for improving the wear performances at the low load, while the micro-concave processed by CE is more favorable for improving the wear performances at the high load. These findings are in helping to understand the effect of surface texture on wear performance of CLPR.
Highlights
The marine diesel engine is the heart of a marine system
Surface texture of the cylinder liner is identified as one of the significant factors that improve the tribological properties of diesel engine with regard to wear, oil consumption, fuel efficiency, lubrication oil, and so on [2]
3 Results and Discussion The tribological properties of the Cylinder liner-piston ring (CLPR) were investigated through comparative analyses of the friction coefficients, wear surface topographies and resistances values under
Summary
Cylinder liner-piston ring (CLPR) system is one of the major contributors for the mechanical losses in a diesel engine [1]. Surface texture of the cylinder liner is identified as one of the significant factors that improve the tribological properties of diesel engine with regard to wear (surface topography and running performance), oil consumption, fuel efficiency, lubrication oil (element concentration and wear particle), and so on [2]. For this reason, cylinder liner surfaces are processed by exercising immense attention. Various models including the numerical [6, 7], lubrication [8], and analytical [9, 10] ones were developed to study and reduce the friction between cylinder liner and piston ring by alternating the shape, size, and pattern orientations of the surface textures
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