Lubrication Analysis of Piston Skirts

Goenka, P. K.; Meernik, Paul

doi:10.4271/920490

Cited by 19 publications

(6 citation statements)

References 10 publications

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“…The mixed lubrication evaluates the piston skirt lubrication considering the bearing bodies as rigid couple surfaces that normal loads are sustained by hydrodynamic pressure and asperities contact. 47 Dursunkaya et al developed an EHL skirt model that can solve piston secondary motion, skirt lubrication and skirt elastic deformations simultaneously. The model allowed for the calculation of piston secondary motion for both conventional and articulated pistons.…”

Section: Elasto-hydrodynamic Lubrication (Ehl)mentioning

confidence: 99%

Piston dynamics, lubrication and tribological performance evaluation: A review

Delprete

Razavykia

2018

International Journal of Engine Research

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Mechanical power loss of lubricated and bearing surfaces serves as an attractive domain for study and research in the field of internal combustion engines. Friction reduction at lubricated and bearing surface is one of the most cost-effective ways to reduce gas emission and improve internal combustion engines’ efficiency. This thus motivates automotive industries and researchers to investigate tribological performance of internal combustion engines. Piston secondary motion has prime importance in internal combustion engines and occurs due to unbalanced forces and moments in a plane normal to the wrist pin axis. Consequently, piston executes small translations and rotations within the defined clearance during the piston reciprocating motion. Mechanical friction power loss and lubrication at piston skirt/liner and radiated engine noise are dramatically affected by piston secondary dynamics. The lubrication mechanism, piston secondary motion and tribological performance are affected by piston design parameters (piston/liner clearance, wrist pin offset, skirt profile, etc.), lubricant rheology, oil transport mechanism and operating conditions. Therefore, this review is devoted to summarize the synthesis of main technical aspects, research efforts, conclusions and challenges that must be highlighted regarding piston skirt/liner lubrication and piston dynamics and slap.

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Section: Elasto-hydrodynamic Lubrication (Ehl)mentioning

confidence: 99%

Piston dynamics, lubrication and tribological performance evaluation: A review

Delprete

Razavykia

2018

International Journal of Engine Research

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“…Cylinder friction was reported to represent 40% to 55% of the total engine friction, which can be divided into contributions from the piston rings, the piston and the connecting rod. The general view [10][11][12] is that piston rings contribute 28-45% to the total cylinder friction with the piston and connecting rods each contributing 25-47% and 18-33%, respectively. The friction contributions to total ring pack friction at each piston ring to liner conjunction are: 13-40% for the compression ring, 10-22% for the second ring, and 50-75% for the oil control ring.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

et al. 2021

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Several approaches have been developed to measure instantaneous friction between the piston assembly and cylinder in internal combustion (IC) engines, such as floating-liner, reciprocating liner, instantaneous mean effective pressure (IMEP), fixed sleeve, and (P-ω) method and tribological bench tests. However, the “floating-liner method” and the “(IMEP) method” are the most common methods used to measure instantaneous friction between the piston assembly and IC engines. This paper critically evaluates different approaches to the design of the “floating-liner”. The paper begins by discussing piston assembly frictional losses and their significance and then discuss the development of instantaneous piston-friction measurements. After that, it reviews the main design challenges in the floating-liner approach. “Methods of cylinder sealing” and “force balancing methods” are also reviewed. Design challenges associated with firing operation were presented. Floating-liner designs were classified into different categories with a detailed presentation of the features of each. The paper ends by presenting a range of broad recommendations for further work which would benefit future designs.

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“…Computer simulations of piston secondary motion started decades ago [1][2][3][4][5][6][7][8][9][10]. The very early studies calculated piston dynamics considering neither skirt elastic deformation nor lubrication [8 -11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Piston Design Parameters on Piston Secondary Motion and Skirt - Liner Friction

Mansouri

Wong

2005

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this article, a previously developed and experimentally validated piston secondary motion model has been improved further numerically and applied to understand the detailed interactions between the piston skirt and the cylinder liner for various piston design parameters. The model considers the roughness of the surfaces and the topography of the skirt in both the axial (barrel profile) and circumferential (ovality) directions. Three modes of lubrication: hydro-dynamic, mixed, and boundary lubrication regimes have been considered and the skirt is partially flooded in most cases. Elastic deformation of the skirt is an essential part of the model. In this model, the piston dynamic behaviour and frictional and impact forces are predicted as functions of crank angle and are examined in detail. Parameters investigated include piston skirt profile, piston-to-liner clearance, surface roughness, and oil availability. The results show that some of these parameters have profound effects on the frictional and impact forces at the piston skirt/liner interface, and therefore, they have the potential to optimize the piston frictional power loss. Correlations and non-dimensional scaling laws are developed to illustrate the basic governing phenomena. These results aim to provide a set of quantitative design guidelines.

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Lubrication Analysis of Piston Skirts

Cited by 19 publications

References 10 publications

Piston dynamics, lubrication and tribological performance evaluation: A review

Piston dynamics, lubrication and tribological performance evaluation: A review

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

Effects of Piston Design Parameters on Piston Secondary Motion and Skirt - Liner Friction

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