Tribological solutions for engine piston ring surfaces: an overview on the materials and manufacturing

Ferreira, Rita; Martins, Jorge; Carvalho, Ó.; Sobral, Luis Gonzaga Santos; Carvalho, S.; Silva, Filipe

doi:10.1080/10426914.2019.1692352

Cited by 36 publications

(25 citation statements)

References 178 publications

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“…Growing needs to light-weight materials possessing self-lubricating characteristics as well as high chemical stability in aqueous solution has urged researchers to manufacture new PMCs suitable for aqueous media applications such as ships, water pumps, and washing machines [123][124][125]. However, by working under a high loading and low-velocity condition, the created water film does not reveal a high carrying capacity because of the low viscosity which results in a mixed or boundary lubrication condition [126].…”

Section: Materials Development Pmcmentioning

confidence: 99%

“…Solid lubricant compounds, by providing boundary lubrication, help the COF and wear reduce. One vital element to consider is the thin layer that is transferred from the surface of lubricated surface to the counterface, named tribo-film, tribo-layer, or transfer film [123][124][125]. Moreover, there are a broad variety of solid lubricants, e.g., inorganic materials with lamellar structure (graphite, h-BN, sulfides, selenides, tellurides, etc.…”

Section: Solid Lubricationmentioning

confidence: 99%

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Recent Progress in the Study of Thermal Properties and Tribological Behaviors of Hexagonal Boron Nitride-Reinforced Composites

et al. 2020

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Ever-increasing significance of composite materials with high thermal conductivity, low thermal expansion coefficient and high optical bandgap over the last decade, have proved their indispensable roles in a wide range of applications. Hexagonal boron nitride (h-BN), a layered material having a high thermal conductivity along the planes and the band gap of 5.9 eV, has always been a promising candidate to provide superior heat transfer with minimal phonon scattering through the system. Hence, extensive researches have been devoted to improving the thermal conductivity of different matrices by using h-BN fillers. Apart from that, lubrication property of h-BN has also been extensively researched, demonstrating the effectivity of this layered structure in reduction of friction coefficient, increasing wear resistance and cost-effectivity of the process. Herein, an in-depth discussion of thermal and tribological properties of the reinforced composite by h-BN will be provided, focusing on the recent progress and future trends.

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Section: Materials Development Pmcmentioning

confidence: 99%

Section: Solid Lubricationmentioning

confidence: 99%

Recent Progress in the Study of Thermal Properties and Tribological Behaviors of Hexagonal Boron Nitride-Reinforced Composites

et al. 2020

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“…Τhe impact of piston ring-bore contact has also been investigated by many engine suppliers to optimize the main design issues. Thus, innovative piston rings with high-quality standards should be manufactured and produced [3,4]. The proposed strategies to find the best ring tribological performance include changing the engine parameters such as pressure, speed and lubricant temperature.…”

Section: Introductionmentioning

confidence: 99%

Tribotronic Analysis of Internal Combustion Engine Compression Ring

2021

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The influence of operating conditions of the compression rings on the engine power losses affects confoundedly the design of the Internal Combustion Engines (ICEs). Normalized parameters such as Friction Mean Effective Pressure (FMEP) were used to regulate power losses. The purpose of this work was to create a primary control model of the friction mean effective pressure using an automatic control system. This study incorporates the creation of a mixed-hydrodynamic model for the top compression ring in MATLAB computing environment. The load of ring asperities was predicted using Greenwood-Tripp stochastic model. The pressure distribution along the ring face-width was determined using Reynolds equation through finite difference method with the half-Sommerfeld boundary condition for cavitation outlet zone. This was accomplished by finding the maximum ring pressure for a range of engine speeds and lubricant temperatures. Additionally, the computed results concerning the maximum pressure and the PID controlled characteristics are proposed and compared using a cavitation model. Regarding the automatic system, a PID controller was built using SIMULINK. The numerical results showed that FMEP could be the effective parameter in order to control the engine operation and to proof the tribotronics design in an Internal Combustion Engine.

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“…As one of the most representative systems of the engine, piston ring assembly has been widely studied [4][5][6][7][8][9][10]. Comfort [11] associated the piston ring assembly with 45-50% of the mechanical losses of a heavy-duty diesel engine.…”

Section: Introductionmentioning

confidence: 99%

A New Tribometer for the Automotive Industry: Development and Experimental Validation

et al. 2021

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Background In automotive engineering, the piston ring-cylinder liner pair is among the most studied contacts. From the three piston rings of a conventional internal combustion engine, the top compression ring has a crucial role. The main challenge is to prevent that during the engine lifecycle, the degradation of the piston ring surface might limit the engine's durability. Objective However, a reliable evaluation of the piston rings tribological response requires a steady method. To test and study the tribological performance of the ring-liner pair, the development of a customized test rig is presented in this work. Methods The new oscillating tribometer will test and study the performance of new and commercial piston rings and cylinder liner solutions. According to the foreseen engine operation, four conditions were appointed to perform the control tests, and a testing protocol was established. The selected stainless-steel piston rings were coated with a diamond-like carbon layer, and the cylinder liner parts had the typical plateau honed texture in the contact surface. The friction force measures were recorded. It was also investigated the influence of distinct parameters (such as temperature and contact pressure) in the friction coefficient of this pair. Results According to the exploratory tests, the major COF was registered for the testing condition with a lower load. In contrast, the lower COF values were recorded for those conditions with superior normal loads and temperatures. Conclusions The functionality of the developed test rig was verified to evaluate the ring's performance and the liner contact.

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Tribological solutions for engine piston ring surfaces: an overview on the materials and manufacturing

Cited by 36 publications

References 178 publications

Recent Progress in the Study of Thermal Properties and Tribological Behaviors of Hexagonal Boron Nitride-Reinforced Composites

Recent Progress in the Study of Thermal Properties and Tribological Behaviors of Hexagonal Boron Nitride-Reinforced Composites

Tribotronic Analysis of Internal Combustion Engine Compression Ring

A New Tribometer for the Automotive Industry: Development and Experimental Validation

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