Abstract
Based on the average flow model and the asperity contact theory, the study is presented for mixed lubrication of main bearing in a high power density(HPD) diesel engine. The BOOST software is used to obtain cylinder pressure. The average Reynolds equation, the asperity contact equation and the motion equation of the journal center for main bearing are solved. The effects of difference in oil grade, inflow oil temperature, radial clearance of bearing and rotational speed of engine on lubricating performance are analyzed. Results show that as inflow oil temperature increases, the minimum film thickness ratio is decreased. Effects of roughness need considering when determining the optimal radial clearance. Too large or too small radial clearance is not good for bearing lubrication. Lower half bushing is worn at low speed, while both upper half and lower half bushing are worn at high speed.
| Original language | English |
|---|---|
| Pages (from-to) | 90-95 |
| Number of pages | 6 |
| Journal | Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) |
| Volume | 29 |
| Issue number | 1 |
| Publication status | Published - Jan 2011 |
Keywords
- High power density diesel engine
- Main bearing
- Mixed lubrication