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| Coupled Analysis of Tribology and Dynamics of Crankshaft–Bearing Bush of the High–Speed Marine Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2025.02.012 |
| Key Words:diesel engine crankshaft bearing shell dynamics tribology coupling simulation |
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| Abstract:Due to the strong coupling phenomenon between the dynamic characteristics of the crankshaft and the friction properties of the bearing bush in diesel engines， a tribological and dynamic coupling calculation model for the crankshaft and bearing bush was established based on lubrication and multi-body dynamic simulation technology. The disparity in torsion angle of the crankshaft free end， loads of main bearing， and shaft center trajectory in lubricated versus non-lubricated states was computed and analyzed. Furthermore， an assessment was conducted on how variations in bearing width， clearance， oil groove width， and journal oil hole diameter impact friction loss of the bearing shell as well as free end twist angle. The results indicated under the lubrication of oil film， the maximum torsion angle at the crankshaft free end decreased by 2.12%， the shaft center trajectory increased， and the eccentricity decreased. Increasing bearing bush clearance from 0.100 mm to 0.150 mm resulted in a 12.56% reduction in friction loss and a 0.92% increase in free torsion angle. Furthermore， widening the oil groove from 10 mm to 15 mm led to a 1.01% reduction in friction loss with almost no change in free end twist angle. And increasing journal oil hole diameter from 10 mm to 30 mm resulted in a negligible change in free twist angle but an increase of 1.53% in friction loss. |
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