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Measurement of Piston Frictional Force in Actual Operating Diesel Engine
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English
Abstract
Frictional force as a function of crank angle of a piston assembly and piston rings alone were measured after the following devices were developed.
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(1)
A gas sealing device that did not affect the measuring values.
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(2)
A device to minimize the effect of gas pressure on the cylinder head and block deformations.
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(3)
A device to minimize the effect of piston slap force.
From the measurement of the frictional force diagrams the following characteristics have been found.
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(1)
Lubricating oil temperature has the greatest effect upon the frictional loss of the piston.
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(2)
Piston friction does not increase to the point of becoming proportional to the engine speed.
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(3)
Friction in the expansion stroke increases at high load by the piston slap phenomenon. But the increase of total losses are small because the duration is short.
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(4)
Piston rings account for the majority of the entire frictional force of the piston.
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Authors
Citation
Furuhama, S. and Takiguchi, M., "Measurement of Piston Frictional Force in Actual Operating Diesel Engine," SAE Technical Paper 790855, 1979, https://doi.org/10.4271/790855.Also In
References
- Furuhama S. Hiruma M. “The Relationship Between Piston Ring Scuffing and the Formation of Surface Profile” PISTON RING SCUFFING I. Mech. E. London 13 - 14 May 1975 35
- Taylor C. F. “The Internal Combustion Engine in Theory and Practice” Second I M.I.T. Press 1966 350
- Furuhama S. Suzuki H. “Temperature Distributions of Piston and Piston Rings in High Speed Diesel Engine” Trans. of Japan Soc. Mech. Engrs. 45 392 April 1979 571
- Furuhama S. Ichikawa H. “Reration Between the Piston Lateral Motion and the Cylinder Vibration” Proc. Japan Soc. Mech. Engrs. 720-8 May 1972 85