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Measurement of Oil-Film-Thickness Between Piston Ring and Cylinder
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English
Abstract
For continuous measurement of oil-film-thickness on the piston ring, an electrical capacitance method has been applied. The capacitance pick-up fixed in the ring had an electrode with or without an insulating surface layer. We also measured friction forces at the same time, and learned the following.
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(1)
If oil is supplied adequately, oil-film-thickness agrees with the theoretical value. Friction force, however, was 2 or 2.5 times greater than the theoretical value.
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(2)
Oil-film-thickness on the top ring of the actual engine is considerably smaller than the theoretical value. This is considered attributable to inadequate oil supply (starvation).
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(3)
The piston ring sliding surface is not always parallel to the cylinder wall. This phenomenon has a major influence on the formation of partial oil-film-thickness.
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Authors
Citation
Shin, K., Tateishi, Y., and Furuhama, S., "Measurement of Oil-Film-Thickness Between Piston Ring and Cylinder," SAE Technical Paper 830068, 1983, https://doi.org/10.4271/830068.Also In
References
- Furuhama: S. “A Dynamic Theory of Piston Ring Lubrication” Bulletin of JSME 2 7 1950
- Wakuri, U. Fukushima M. Taniguchi: T. “On the Oil Film Behavior of Piston Ring” Transactions of JSME 43 370
- Ting L.L. Mayer, J.E. Jr “Piston Ring Lubrication and Cylinder Bore Analysis, Part-1 - Theory Verification” Transactions of the ASME (Journal of Lubrication Technology) July 1974
- Furuhama, S. Takiguchi M. Tomizawa: K. “Effect of Piston and Ring Design on the Piston Friction Forces in Diesel Engine” SAE 810977
- Moore S.L. Hamilton: G.M. “Measurement of the Oil Film Thickness between the Piston Rings and Liner of a Small Diesel Engine” IME 188 20/74
- Furuhama S. Takiguchi: M. “Measurement of Piston Frictional Force in Actual Operating Diesel Engine” SAE 790855
- Furuhama S. Suzuki: H. “Temperature Distribution of Piston Rings and Piston in High Speed Diesel Engine” Bulletin of the JSME 22 174 Dec. 1979