The elastohydrodynamic lubrication theory was applied to a lubrication analysis model of con-rod big-end bearings. The model was improved by taking account of the bearing deformation by body force and the effect of oil holes. The improved model was applied to a practical engine, and the influences of body force and oil holes on lubrication were estimated. After that, the model was examined by comparing the theoretical results and the experimental ones. The propriety of the model was experimentally verified by the orbital movements and the rubbing trace on a bearing surface. The bearing deformation appeared in both theoretical and experimental results; the elastohydrodynamic lubrication theory proved necessary. Finally, the body force and oil holes were found to play important roles on the theoretical calculation; they should be incorporated in the elastohydrodynamic lubrication theory of con-rod big-end bearings.
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