The problems of piston skirt microgeometry in combustion engines

Iskra, Antoni; Babiak, Maciej; Wróblewski, Emil

doi:10.1088/1757-899x/148/1/012068

Cited by 3 publications

(8 citation statements)

References 9 publications

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“…Parts of greater cross-section have lower thermal resistance, which makes the temperature on the piston skirt in these regions much higher than on the plane perpendicular to the kingpin axis. This results in greater thermal deformations towards the kingpin axis, which is why the piston skirt must be oval with a high ovality axis perpendicular to the axis of the kingpin and a low ovality axis alongside the kingpin to ensure that under operating temperatures the piston skirt becomes cylinder-shaped or close to it [6].…”

Section: The Piston Skirtmentioning

confidence: 99%

“…When the piston reaches its operating temperatures, the play between the piston and the cylinder liner changes. Changes in the play also occur after any change of the operating conditions following the stabilization of the thermal equilibrium [6,22].…”

Section: The Piston Skirtmentioning

confidence: 99%

“…The consequence of these changes is that engines operate at high thermal and mechanical loads. This is an adverse phenomenon for the piston-crankshaft assembly, particularly for pistons exposed to high temperatures and pressures inside the cylinder [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The stepped shape can be obtained i.e. by the application of refining coatings of materials with good friction properties [17][18][19]. One such material is a graphite, commonly used to cover the bearing surface of the piston.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: The Piston Skirtmentioning

confidence: 99%

Section: The Piston Skirtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

2017

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“…Many methods of improving the efficiency of the internal combustion engine are known. Some of these are focused on limiting mechanical losses [21], others on reducing thermal losses [48]. The extension of the range in which the internal combustion engine works most effectively usually consists of the introduction of variable valve timing, variable valve lift, variable intake port length, multi-stage charging, and more recently, also in the variable compression ratio of the engine [33].…”

Section: Introductionmentioning

confidence: 99%

A three-way catalyst system for a five-stroke engine

Noga¹

2019

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This paper presents the results of research on the development of an exhaust gas aftertreatment system for a turbocharged five-stroke engine. This engine was designed and constructed at Cracow University of Technology. A characteristic feature of the five-stroke engine is the use of an additional expansion process to increase overall efficiency. A challenge for a catalytic converter is the fact that it has a low exhaust gas temperature. Two three-way catalytic converters were tested-one with a ceramic support and the second with a metal support. The results of the tests showed that the reactor with a ceramic support obtains an acceptable conversion efficiency starting with an exhaust gas temperature of 280°C. For the metal-support reactor, a few percent increase in torque and a decrease in the brake-specific fuel consumption of the engine was obtained; however, the converter itself did not show signs of operation even with an exhaust gas temperature of over 380°C. The performed analyses highlighted directions of further development works in this area.

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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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The problems of piston skirt microgeometry in combustion engines

Cited by 3 publications

References 9 publications

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

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

A three-way catalyst system for a five-stroke engine

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

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