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| Dynamic Simulation Research on the Friction Lubrication Process of Engine Connecting Rod Bearings |
| DOI：10.13949/j.cnki.nrjgc.2022.02.011 |
| Key Words:journal bearing flow heat transfer cavitation phenomenon computational fluid dynamics（CFD） |
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| Abstract:Taking the connecting rod bearing as the research object， through simulation calculation， it was found that among the three cavitation models Singhal， Schnerr and Sauer and Zwart-Gerber-Belamri， the Singhal was more sensitive to the peak pressure. And Singhal was used to study the influence of the position of the oil inlet on the cavitation range and the influence of the radial relative motion between the journal and bush on the oil film cavitation. Results show that in steady state simulation， along the rotation direction of the journal， the cavitation phenomenon is obvious on the downstream of the minimum oil film thickness， and the cavitation range is affected by the range between the minimum oil film thickness and the oil inlet. In the transient state simulation， when the shaft clearance decreases， the peak pressure increases gradually， and reaches the maximum（187 MPa） at the minimum oil film thickness（1 μm）. When the shaft clearance increases， the peak pressure drops suddenly. In this process， significant cavitation will occur in the downstream of the minimum oil film. Cavitation mainly occurs and disappears when the journal moves away from the bush. When the shaft clearance is about 40 μm， the cavitation is the most severe. With the further increase of the shaft clearance， the cavitation degree gradually decreases. When the shaft clearance reaches about 110 μm， the cavitation disappears. |
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