Reibungsreduzierung bei Kolbensystemen im Ottomotor

Fahr, Matthias; Hanke, Wolfgang; Klimesch, Christian; Rehl, Andreas

doi:10.1365/s35146-011-0129-9

Cited by 10 publications

(11 citation statements)

References 1 publication

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“…Modern engines are also expected to provide the highest overall efficiency [7]. The way to ensure that is to reduce the friction loss in the piston-cylinder pair [8][9].…”

Section: Introductionmentioning

confidence: 99%

Simulations geometric structures of the stepped profile bearing surface of the piston

2017

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Abstract. The main node piston-pin-piston rings are most responsible for the formation of mechanical losses. It is advisable to reduce friction losses in the piston-cylinder group lead to an increase in the overall efficiency of the engine and thus reduce the fuel consumption. The method to reduce the area covered by the oil film is a modification of the bearing surface of the piston by adjusting the profile. In this paper the results of simulation for the stepped microgeometry piston bearing surface are presented.

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“…Modern engines are also expected to provide the highest overall efficiency [7]. The way to ensure that is to reduce the friction loss in the piston-cylinder pair [8][9].…”

Section: Introductionmentioning

confidence: 99%

Simulations geometric structures of the stepped profile bearing surface of the piston

2017

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“…In addition, increasing the mean effective pressure can increase local temperatures in cooperating elements of the piston-crank mechanism, especially those in direct contact with the high temperature exhaust gas, e.g. the bottom of the piston [6][7][8]. This hard environment where parts of the piston-crank mechanism works, especially the piston, causes the certain problems in providing desired stability and reliability of the pistoncrank mechanism and minimizing fuel consumption at the same time [9].…”

Section: Introductionmentioning

confidence: 99%

“…One method of improving the durability of the cylinder liner and the bearing surface of the piston and reduced fuel consumption as well, is the use of appropriate coatings on the side surfaces of the pistons. The coatings are applied to the support surface of almost all modern pistons natural aspirated and supercharged engines [6,[10][11]. Purpose of usage of them is primarily to avoid seizing of the piston in adverse operating conditions as [1]:…”

Section: Introductionmentioning

confidence: 99%

“…• local reduce of the piston slack caused by the deformation resulting from thermal and mechanical cylinder loads, The test results clearly confirm the positive role of the standard coating in reduce the possibility of scuffing the piston in the cylinder and reduce the surface wear of the cylinder under the normal engine operating conditions. In real operating conditions the total friction losses depend primarily on the liquid friction conditions so the use of coating does not give direct large benefits in reducing friction [6,12].…”

Section: Introductionmentioning

confidence: 99%

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The impact of microgeometry pistons with a stepped bearing surface for the friction loss of the internal combustion engine

2017

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This paper present the results of experimental piston friction losses on stepped bearing surface microgeometry obtained on the test rig. This test rig is equipped with special temperature control system, which provides better stability to temperature than in standard systems. The results of station tests was discussed. Tests was analyzed depending the moment caused by the friction on the oil temperature in the oil sump. Specified conclusions allow to assess the impact of the stepped profile of the pistons bearing surface microgeometry for different values of engine speed and the oil temperature at the friction losses in the main kinematic engine node which is piston-cylinder.

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“…A thin oil film of lubricant structure, which inside layer moving relative to each other generate hydrodynamic pressure due to the viscosity of the lubricant. The formation of the oil film is only possible under certain geometrical parameters of mating surfaces [3,4,6].…”

Section: Introductionmentioning

confidence: 99%

[i][/i]THE IMPACT OF MICROGEOMETRY BEARING SURFACE OF THE PISTON ON THE PARAMETERS OF OIL FILM

Wróblewski

Iskra

Babiak

2016

Journal of KONES. Powertrain and Transport

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The formation of oil film is possible under certain parameters of microgeometry cooperating components the main node of the internal combustion engine, which is a piston-pin-piston rings. In addition, this node is primarily responsible for the formation of mechanical losses. It is advisable to reduce friction losses in the piston-cylinder group lead to an increase in the overall efficiency of the engine and thus reduce the fuel consumption. One way of achieving these objectives is modification of microgeometry of the piston-bearing surface, which cooperates with the cylinder wall. The geometry of the gap between the piston skirt and the cylinder liner greatly affects the friction loss inside the engine. This means that the friction loss is much more affected by the area covered by the oil film separating the mating elements than its thickness. The method to reduce the area covered by the oil film is a modification of the bearing surface of the piston by adjusting the profile. The supporting surface, which performs a reciprocating motion relative to the strokes of the cylinder liner ensure the continuity of the oil film with the smallest possible value of the friction losses at the node piston-cylinder. This paper presents the results of simulation leading which aim to determining the parameters oil film on the friction loss for the modified bearing surface of the piston.

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Reibungsreduzierung bei Kolbensystemen im Ottomotor

Cited by 10 publications

References 1 publication

Simulations geometric structures of the stepped profile bearing surface of the piston

Simulations geometric structures of the stepped profile bearing surface of the piston

The impact of microgeometry pistons with a stepped bearing surface for the friction loss of the internal combustion engine

[i][/i]THE IMPACT OF MICROGEOMETRY BEARING SURFACE OF THE PISTON ON THE PARAMETERS OF OIL FILM

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