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Measurement of the Oil Film Thickness Between the Cylinder Liner and the Piston Rings in a Heavy Duty Directly Injected Diesel Engine
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English
Abstract
An electrical capacitance measuring method has been used to obtain the cylinder liner oil film thicknesses for various speeds and loads in a heavy duty directly injected diesel engine.
Interesting facts have been observed:
- Increased oil film thickness for the top ring distance to wall during idling.
- A gas pocket appearing between top ring and liner at increasing speeds and loads
- movement of the piston in the liner when combustion sets in, the motion is not parallel.
- temperature seems to have little effect on the oil film thickness.
A computer model of the top ring showed good conformance with the measurements over the speed and load range, but the calculated oil film thickness is about 3 to 6 times higher.
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Citation
Mattsson, C., "Measurement of the Oil Film Thickness Between the Cylinder Liner and the Piston Rings in a Heavy Duty Directly Injected Diesel Engine," SAE Technical Paper 952469, 1995, https://doi.org/10.4271/952469.Also In
References
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- Heywood John B. “Internal Combustion Engine Fundamentals” Mcgraw-Hill International 1988
- Hamrock Bernard J. “Fundamentals of Fluid Film Lubrication” NASA Reference Publication 1255 Augusti 1991
- TRW Thompson GmbH Handbuch 1983
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- Yeau-Ren Jeng “Friction and Lubrication Analysis of a Piston-Ring Pack” SAE Paper 920492 1992