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Piston Thermal Deformation and Friction Considerations
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1982 by SAE International in United States
Annotation ability available
The piston assembly is generally believed to account for a large percentage of the total engine mechanical power loss. Maintaining a proper running skirt profile and skirt-to-bore clearance at operating temperature is essential in piston friction reduction. Pistons for current automotive engines are made of an aluminum alloy which has a thermal expansion coefficient 80% higher than that of the cast iron material commonly used for the engine block. The running clearance under engine operating conditions is, therefore, quite different from the design clearance, and a capability to compute the piston thermal expansion is needed.
In this study, a three-dimensional finite element model was developed to calculate the piston operating temperature and the corresponding thermal expansion in the presence of asymmetric structural features such as a translot, a steel strut, and a pin boss. The model can be used to design skirt profiles which have the potential to decrease break-in time, reduce friction, and minimize piston slap.
|Technical Paper||DETERMINATION OF LOCAL HEAT TRANSFER COEFFICIENTS AT THE PISTON OF A HIGH SPEED DIESEL ENGINE BY EVALUATION OF MEASURED TEMPERATURE DISTRIBUTION|
|Technical Paper||Heat Transfer in Piston Cooling|
CitationLi, C., "Piston Thermal Deformation and Friction Considerations," SAE Technical Paper 820086, 1982, https://doi.org/10.4271/820086.
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