Measurement of Piston Frictional Force in Actual Operating Diesel Engine
790855
2/1/1979
- Content
- 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.-
(1)
Lubricating oil temperature has the greatest effect upon the frictional loss of the piston.
-
(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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(1)
- Citation
- Furuhama, S. and Takiguchi, M., "Measurement of Piston Frictional Force in Actual Operating Diesel Engine," 1979 SAE International Off-Highway and Powerplant Congress and Exposition, Milwaukee, Wisconsin, United States, September 10, 1979, https://doi.org/10.4271/790855.