Study of the Effects of Oil Supply and Piston Skirt Profile on Lubrication Performance in Power Cylinder Systems

Meng, Zhen; Ahling, Sebastian; Tian, Tian

doi:10.4271/2019-01-2364

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Therefore, near TDC, contact and scraping occur not only at the upper PS of thrust side and the lower PS of anti-thrust side, but also at the upper corner of thrust side, this causes a greater friction force under the thermal condition when there is asperity contact or corner contact. However, it is hydrodynamic lubrication when neither appears, and the friction force is provided by the oil-film shear force as shown in equation (13). Although the average OFT is lower under the thermal condition, the oil viscosity is appreciably lower, and so the first item [ mU h f f + f fs À Á ] in equation ( 13) is lower.…”

Section: Forces Acting On Pistonmentioning

confidence: 99%

“…McFadden and Turnbull 11 studied the secondary piston motion under dry and fully flooded lubrication conditions. Meng et al 12,13 established a model of oil transport and separation based on the cavitation. The oil distribution and lubrication characteristics between PS–CL are obtained, and then the effects of different oil supply strategies and skirt profile are studied.…”

Section: Introductionmentioning

confidence: 99%

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Influence of thermal effect in piston skirt lubrication considering thermal deformation of piston and cylinder liner

Wang

et al. 2023

International Journal of Engine Research

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With the development of high-strength marine diesel engines, piston skirt lubrication plays an increasingly important role. In this study, to ensure that the mixed lubrication can be applied, the contact of the PS corner and CL is simplified to a spring–damper system. A coupled dynamical–tribological numerical model of a piston skirt is proposed by combining mixed lubrication and the secondary motion of the piston. The model is then used to study how the thermal effect of the piston skirt-cylinder liner friction pair affects (i) the secondary motion of the piston, (ii) the contact force of the piston-skirt corner points, and (iii) the lubrication characteristics, while considering ring friction, friction moment of piston pin and three-dimensional thermal deformation of the piston and cylinder liner. The results show that the secondary motion under the thermal condition is less than that under the cold condition, and the reverse rotation of the piston under the thermal condition occurs earlier. Asperity contact and corner points contact appear under the thermal condition, and the friction mean effective pressure under the cold condition is 47.7% greater than that under the thermal condition. Overall, it is necessary to consider the thermal effect of the piston skirt-cylinder liner friction pair.

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Section: Forces Acting On Pistonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of thermal effect in piston skirt lubrication considering thermal deformation of piston and cylinder liner

Wang

et al. 2023

International Journal of Engine Research

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“…Applying a soft coating on the skirt to allow fast break-in can be considered as advantageous as the exact bore distortion is changing with operating conditions and not known. It was found that maximizing the hydrodynamic lubrication is still beneficial to the reduction of the skirt friction even when the coefficient of the friction of the boundary lubrication is as low as 0.03 [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines

2019

Self Cite

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The piston skirt is one of the main contributors to the total mechanical loss in internal combustion engines. Usually, the skirt friction experiences a rapid change during the break-in period largely due to the wear of the machine marks or roughness against soft coatings. It is thus important to consider the effect of the change of the roughness for a realistic prediction of the piston skirt friction and system optimization. In this work, an existing model of piston skirt lubrication was improved with the consideration of a breaking in process for the most commonly used triangle machine marks. A new set of flow factors in the averaged Reynolds equation were analytically derived for the trapezoid shape formed after wear of the original triangle shape. A new asperity contact model was developed for the trapezoid shape. The calculation results reflect the trend of friction mean effective pressure (FMEP) during break-in in an engine test and showed quantitative agreement under the same amount of wear.

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Method for Calculating and Selection the Optimal Profile of Clearance in Pairs of Cylinder-Piston Group of Piston Engine

Shabanov

Sidorov

Brodnev

et al. 2020

Advances in Mechanical Engineering

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Study of the Effects of Oil Supply and Piston Skirt Profile on Lubrication Performance in Power Cylinder Systems

Cited by 6 publications

References 6 publications

Influence of thermal effect in piston skirt lubrication considering thermal deformation of piston and cylinder liner

Influence of thermal effect in piston skirt lubrication considering thermal deformation of piston and cylinder liner

Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines

Method for Calculating and Selection the Optimal Profile of Clearance in Pairs of Cylinder-Piston Group of Piston Engine

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