New cylinder liner surfaces for low oil consumption

Johansson, Staffan; Nilsson, Per H.; Ohlsson, Robert; Anderberg, Cecilia; Rosén, Bengt-Göran

doi:10.1016/j.triboint.2008.02.012

Cited by 86 publications

(58 citation statements)

References 2 publications

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“…There was a very strong-but negative-relation appears between the cylinder liner roughness parameters tested and harmful exhaust emission, including carbon oxide CO and hydrocarbons HC. These results confirm that with an increased higher cylinder liner surface, the oil retention volume corresponds to the Rvq and A2 parameters and that there is a higher oil consumption and, consequently, a greater emission of CO, HC, and soot [8,12]. This is a limitation for acceptable values of Rvq and A2 parameters, which must be balanced within an overall cylinder liner manufacturing technology.…”

Section: Discussionsupporting

confidence: 64%

“…The importance of the honing process in finishing cylinder liners in order to promote satisfactory engine parameters and avoid scuffing is now well recognized, but not entirely understood [2]. For example, it is commonly known that increasing the oil retention capacity by deepening the valleys in the cylinder liner plateau profile results in a decrease of mechanical losses [4,[6][7][8][9]. The underlying mechanism of this reduction in mechanical losses at smaller roughness heights can be explained on a modified Stribeck curve [10] as being due to blow-by and cavitation phenomena [11].…”

Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 99%

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Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Woś

Michalski

2011

Tribol Lett

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Reciprocating piston engines are the major propulsion devices for light aircrafts, helicopters, and essentially all automotive vehicles. They are expected to fulfil both present-day and future demands for engine performance, durability, fuel economy, and exhaust emissions legislation. One of the key factors related to these demands is the need to the limit thermomechanical internal losses, wear, and lubricating oil consumption, which are in turn conditioned by the tribological behavior of the piston-cylinder assembly. Consequently, this latter system requires a multi-directional approach in terms of manufacturing. Apart from various modifying techniques (e.g. laser texturing), a conventional plateau-honing operation is still the standard technology for shaping cylinder liner surface microstructure. This paper describes the distinctions between variations in the performance of the engines in relation to cylinder liner roughness parameters due to different honing settings. Five air-cooled reciprocating aircraft engines (FRANKLIN 4A-235-B31) served as the objects of research. The engines passed durability tests on the dynamometer bed, including operation under artificially intensified wear conditions. The results show a significant impact of the brand-new honed cylinder liner surface microstructure on the engine output parameters. Detailed study proves that some of the cylinder liner roughness parameters, specifically, the slope of the root mean square line (RMS) for valley roughness Rvq and the linear triangle area for valleys A2, are strongly correlated with the engine operational properties. Higher values of Rvq and A2 are associated with an improvement in engine performance but result in a deterioration in the exhaust harmful emission.Keywords Gasoline internal combustion engine Á Engine performance Á Plateau honing Á Piston-cylinder assembly Á Cylinder liner Á Surface roughness Á Abrasive wear Á Tribological behavior Abbreviations A2Roughness profile parameter-linear triangle area for valleys (lm) CO Concentration of carbon monoxide in exhaust (%) HC Concentration of hydrocarbons in exhaust (ppm) ge Brake-specific fuel consumption (BSFC; g/kW h) Ne Engine output power (kW) Mo Engine output torque (N m) go Engine total efficiency (%) P-C Piston-cylinder Rq Roughness profile parameter-root mean square of heights (lm) Rvq Roughness profile parameter-slope of a linear regression of valley region (lm)

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Section: Discussionsupporting

confidence: 64%

Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 99%

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Woś

Michalski

2011

Tribol Lett

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“…As the consequence, the emptiness coefficient Sp/Sz increased, its changes could be substantial. Improper estimation of parameters Sk, Sp/Sz and Ssk is of great importance; it was found that oil emission by the engine was proportional to the core roughness Sk [17] and cylinder wear under various conditions was proportional to the emptiness coefficient Sp/Sz [18,19]. The Svk parameter is also within the requirement of the leading engine builders, since it is connected with oil capacity; cylinders whose surfaces are characterized by a small Svk value have an inclination to seizure.…”

Section: Plateau-honed Cylinder Surfacesmentioning

confidence: 99%

The Effect Of Reference Plane On Values Of Areal Surface Topography Parameters From Cylindrical Elements

Podulka¹,

Dobrzański²,

Pawlus³

et al. 2014

Metrology and Measurement Systems

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In this paper distortion of surface topography measurement results by improper selection of the reference plane is taken into consideration. The following types of surfaces from cylindrical elements were analyzed: cylinder liners after plateau honing, cylinder liners with additionally burnished oil pockets and turned piston skirts. Surface topographies of these elements after a low wear process were also studied. In order to obtain areal surface topography parameters, the form was eliminated using cylinders and polynomials of the following degrees: 2, 3, 4, 6, 8, 10 and 12. Parameters of surfaces after form removal were compared. After analysis of results the reference elements for each kind of surface were recommended. A special procedure was proposed in order to select the degree of a polynomial. This method is based on surface topography changes with increase of polynomial degree. The effect of improper form elimination on measuring uncertainty was studied.

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“…Moreover, various new surface textures was proposed by the development of innovate honing techniques (slide honing, glide honing, brush honing…) [7][8][9][10][11] and surface texturing methods to meet both actual and future functional requirements [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In hydrodynamic lubrication condition, two optimal range of crosshatch angle was determined [40°-60°] and [120°-140°] [14]. However, [7] shows that the steep honing angle did not present any improvement in ring-pack friction and wear at the top dead center of the cylinder but it yields to less oil consumption over the entire engine course in comparison to 40° honing angle [8,10].…”

Section: Introductionmentioning

confidence: 99%

Mutual influence of crosshatch angle and superficial roughness of honed surfaces on friction in ring-pack tribo-system

Mezghani

Demirci

Yousfi

et al. 2013

Tribology International

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New cylinder liner surfaces for low oil consumption

Cited by 86 publications

References 2 publications

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

The Effect Of Reference Plane On Values Of Areal Surface Topography Parameters From Cylindrical Elements

Mutual influence of crosshatch angle and superficial roughness of honed surfaces on friction in ring-pack tribo-system

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