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<p>In marine and off-road machinery, diesel engines operate under complex dynamic conditions. The superposition of high-pressure combustion shocks and variable conditions severely deteriorates the lubrication performance of connecting rod bearings, leading to localized wear and potential failures. To investigate the tribo-dynamic behavior under complex conditions, a rigid-flexible coupling dynamic model of the crank-connecting rod mechanism is established. This model considers the effects of combustion pressure, bearing deformation, and surface roughness. The crankshaft and big-end bearing are modeled as modal flexible bodies, and key lubrication characteristics are evaluated using a mixed elastohydrodynamic lubrication (MEHD) model. This study investigates the effects of rotational speed, external load, and wear clearance on the lubrication performance of the big-end bearing, focusing on peak oil film pressure, peak asperity contact pressure, and minimum oil film thickness. Simulation results reveal distinct influences of rotational speed, load and wear clearance on bearing behavior. Further, the simulation outcomes are validated through wear experiments conducted on the big-end bearing of a diesel engine. These findings offer theoretical insight and practical guidance for optimizing bearing design, improving lubrication performance, and extending service life.</p>

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Investigation on Wear Failure of Big-End Bearing of Diesel Under Complex Operating Conditions

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Lingjin Wang,
  • Bin Pang,
  • Ninglu Wang,
  • Yangyang Zhang,
  • Jinjie Zhang

摘要

In marine and off-road machinery, diesel engines operate under complex dynamic conditions. The superposition of high-pressure combustion shocks and variable conditions severely deteriorates the lubrication performance of connecting rod bearings, leading to localized wear and potential failures. To investigate the tribo-dynamic behavior under complex conditions, a rigid-flexible coupling dynamic model of the crank-connecting rod mechanism is established. This model considers the effects of combustion pressure, bearing deformation, and surface roughness. The crankshaft and big-end bearing are modeled as modal flexible bodies, and key lubrication characteristics are evaluated using a mixed elastohydrodynamic lubrication (MEHD) model. This study investigates the effects of rotational speed, external load, and wear clearance on the lubrication performance of the big-end bearing, focusing on peak oil film pressure, peak asperity contact pressure, and minimum oil film thickness. Simulation results reveal distinct influences of rotational speed, load and wear clearance on bearing behavior. Further, the simulation outcomes are validated through wear experiments conducted on the big-end bearing of a diesel engine. These findings offer theoretical insight and practical guidance for optimizing bearing design, improving lubrication performance, and extending service life.