An axi-symmetric, hydrodynamic, mixed lubrication model has been developed using the averaged Reynolds equation and asperity contact approach in order to simulate frictional performance of piston ring and cylinder liner contact. The friction force between piston ring and cylinder bore is predicted considering rupture location, surface flow factors, surface roughness and metal-to-metal contact loading. A fully flooded inlet boundary condition and Reynolds boundary conditions for cavitation outlet zone are assumed. Reynolds boundary conditions have been modified for non-cavitation zones. The pressure distribution along the ring thickness and the lubricant film thickness are determined for each crank angle degree. Predicted friction force is presented for the first compression ring of a typical diesel engine as a function of crank angle position.
Issue Section:
Technical Papers
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15.
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18.
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19.
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28.
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29.
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34.
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40.
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41.
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42.
Uras, H. M., and Patterson, D. J., 1984, “Effect of Some Lubricant and Engine Variables on Instantaneous Piston and Ring Assembly Friction,” SAE Paper 840178.
43.
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, pp. 593
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.Copyright © 2001
by ASME
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