Piston Ring Pack Friction and Lubrication Analysis of an Automotive Engine Using a Mixed Lubrication Model

Sui, Ping C.; Ariga, Susumu

doi:10.4271/931937

Cited by 15 publications

(9 citation statements)

References 17 publications

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“…This approach enabled the inclusion of surface roughness in terms of topographical parameters such as the composite surface Ra into the numerical analysis. This approach was adopted by Sui and Ariga [11] for an analysis of ring pack lubrication. They showed that gradual ring wear yields better conforming geometry which can improve performance.…”

Section: Introductionmentioning

confidence: 99%

Transient elastohydrodynamic lubrication of rough new or worn piston compression ring conjunction with an out-of-round cylinder bore

Rahmani

Theodossiades

Rahnejat

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part J:

127

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Real cylinder bores are out-of-round and axially asymmetrical. The top compression ring, nominally an incomplete circle, is subjected to ring tension and cyclic combustion force in order to conform to the bore surface. The bounding surfaces are rough and their conjunction is subject to a transient tribological state. Therefore, the ring-bore conjunction is only partially conforming for most of the engine cycle. The conjunction may be viewed as a problem of scale, depending on the analysis carried out at a certain bore order (out-of-roundness). Therefore, the contact may be viewed as a multi-lobed rough conjunction, where the regime of lubrication may vary from hydrodynamics to mix with dominant asperity friction at piston reversals. Measured bores and ring profiles are used to predict conjunctional power loss and percentage fuel energy consumed. Furthermore, lubricant's flow through the ring is predicted throughout the engine cycle. These measures are key industrial design drivers for fuel efficiency and reduction of emissions. The results show that the effect of bore out-of-roundness can be even more significant than the surface topography.

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Section: Introductionmentioning

confidence: 99%

Transient elastohydrodynamic lubrication of rough new or worn piston compression ring conjunction with an out-of-round cylinder bore

Rahmani

Theodossiades

Rahnejat

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part J:

127

View full text Add to dashboard Cite

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“…The team also determined that structural analysis is a necessary protocol in piston design. 87 The results from Ito et al were later used in an investigation by Sui and Ariga, 88 who proved that the piston deformation as imposed by the aforementioned parameters affect piston/liner clearance and piston dynamics.…”

Section: Experimental Investigationsmentioning

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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“…∇ · υ = 0, [5] where ν is the kinematic viscosity. Under particular simulation conditions and for specific rough surfaces generating thin and laminar fluid films, the Reynolds equation may be used instead.…”

Section: The Physical Modelmentioning

confidence: 99%

Numerical Analysis of the Consequences of Roughness Modifications in 3D Hydrodynamic Contacts

Caciu

Decencière

Jeulin

2008

Tribology Transactions

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A theoretical study is presented to evaluate the influence of the structure size of laser-textured surfaces on the tribological performance of reciprocating automotive components. A topographic image representing a laser-textured liner surface is progressively filtered, using morphological alternating sequential filters of increasing size, in order to transform the roughness of the initial surface. A numerical tool simulating the hydrodynamic contact between piston rings and liner is then used to compare the performance of the textures issued from the filtering process. The results of this analysis can constitute key data for the definition of new and efficient textured surfaces with this type of application.

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Piston Ring Pack Friction and Lubrication Analysis of an Automotive Engine Using a Mixed Lubrication Model

Cited by 15 publications

References 17 publications

Transient elastohydrodynamic lubrication of rough new or worn piston compression ring conjunction with an out-of-round cylinder bore

Transient elastohydrodynamic lubrication of rough new or worn piston compression ring conjunction with an out-of-round cylinder bore

Piston dynamics, lubrication and tribological performance evaluation: A review

Numerical Analysis of the Consequences of Roughness Modifications in 3D Hydrodynamic Contacts

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