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First International Brazil Conference on Tribology TriboBr-2010 and 2nd Internacional Tribology Symposium of IFToMM — vol. 1, num.1 (2010)

Title

FRICTION CHARACTERISTICS OF STEEL PISTONS FOR DIESEL ENGINES

FRICTION CHARACTERISTICS OF STEEL PISTONS FOR DIESEL ENGINES

Authorship

Kim, Dallwoo; Ito, Akemi; Ishikawa, Yasuhiro; Osawa, Katsuyuki; Iwasaki, Yoshiyuki

Kim, Dallwoo
Kim, Dallwoo

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Ito, Akemi
Ito, Akemi

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Ishikawa, Yasuhiro
Ishikawa, Yasuhiro

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Osawa, Katsuyuki
Osawa, Katsuyuki

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Iwasaki, Yoshiyuki
Iwasaki, Yoshiyuki

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DOI

10.5151/5463-5463-17525

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Abstract

The use of iron pistons is increasing due to the higher power requirements of diesel truck engines. Expansion of the iron piston is a common concern. The purpose of this study is to clarify the lubrication conditions of cast iron and steel pistons. Friction of steel and cast iron pistons was measured using the floating liner method. The friction of conventional aluminum pistons was also measured for comparison in this study. The measurement of the secondary motion of each piston was carried out to analyse piston friction, and the following findings were obtained. The cast iron piston showed boundary lubrication at compression top dead center (TDC). This is presumably caused by the larger tilting angle of the piston induced by the larger piston clearance. Steel pistons showed hydrodynamic lubrication conditions at TDC and BDC through each cycle, due to a good oil supply.

 

The use of iron pistons is increasing due to the higher power requirements of diesel truck engines. Expansion of the iron piston is a common concern. The purpose of this study is to clarify the lubrication conditions of cast iron and steel pistons. Friction of steel and cast iron pistons was measured using the floating liner method. The friction of conventional aluminum pistons was also measured for comparison in this study. The measurement of the secondary motion of each piston was carried out to analyse piston friction, and the following findings were obtained. The cast iron piston showed boundary lubrication at compression top dead center (TDC). This is presumably caused by the larger tilting angle of the piston induced by the larger piston clearance. Steel pistons showed hydrodynamic lubrication conditions at TDC and BDC through each cycle, due to a good oil supply.

Keywords

Diesel engine; Friction / Lubrication; Piston secondary motion; Steel piston.

Diesel engine; Friction / Lubrication; Piston secondary motion; Steel piston.

How to refer

Kim, Dallwoo; Ito, Akemi; Ishikawa, Yasuhiro; Osawa, Katsuyuki; Iwasaki, Yoshiyuki. FRICTION CHARACTERISTICS OF STEEL PISTONS FOR DIESEL ENGINES , p. 648-659. In: First International Brazil Conference on Tribology TriboBr-2010 and 2nd Internacional Tribology Symposium of IFToMM, Rio de Janeiro, 2010.
ISSN: - , DOI 10.5151/5463-5463-17525