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A study of Measurement for Oil Film at the Bearing of the Small End of Diesel Engine Connecting Rod

SAE International Journal of Advances and Current Practices in Mobility

Tokyo City University-Shotaro Suzuki, Shota Yamada, Akemi Ito
  • Journal Article
  • 2019-01-2332
Published 2019-12-19 by SAE International in United States
Downsizing and slowing down of engine speed reduce mechanical losses and improve fuel economy. However, they exacerbate lubrication condition. The oil film thickness of the bearing of the small end of the connecting rod, which was one of the sliding surfaces with the severest lubrication condition in a diesel engine, was measured in this study to clarify the lubrication condition. Optical fibers were embedded in the bearing, and oil film was measured by means of the laser induced fluorescence method. It was found that oil film thickness was affected combustion gas pressure and distortion of the piston pin.
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