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The Journal-Thrust coupling bearing (JTC bearing) operates at the end of the diesel engine crankshaft and has the functions of bearing radial loads and preventing axial movement of the crankshaft. In this paper, the Transient Thermoelastic Fluid Dynamics (TEHD) lubrication model is adopted to analyze the JTC bearings of Marine diesel engines. Based on the flow rate, pressure and thermal continuity conditions between the journal and the thrust component, the thermocompression coupling effect was considered. The transient time-varying load was considered in the lubrication analysis, and the coupling effect under the actual working conditions was discussed. A transient TEHD lubrication experimental platform for JTC bearings was established, and the established model was verified. It is found that the thermocompressive coupling effect between the journal and the thrust component has a significant influence on the transient lubrication behavior of JTC bearings and cannot be ignored. The coupling influence of different boundary conditions on transient lubrication characteristics such as axial clearance, radial clearance, radial load waveform, inclination Angle and inlet oil temperature was studied. This chapter provides theoretical support for the lubrication design of JTC bearings used in diesel engine crankshafts.

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Transient Lubrication and Dynamic Characteristics Analysis of Crankshaft Journal-Thrust Coupled Bearings Under Real Engine Load Conditions

  • 章节

  • 发表日期：

    2025年

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  • Bin Zhao,
  • Xuan Ma,
  • Xiujiang Shi,
  • Xiqun Lu,
  • Zhijun Shuai,
  • Wanyou Li

摘要

The Journal-Thrust coupling bearing (JTC bearing) operates at the end of the diesel engine crankshaft and has the functions of bearing radial loads and preventing axial movement of the crankshaft. In this paper, the Transient Thermoelastic Fluid Dynamics (TEHD) lubrication model is adopted to analyze the JTC bearings of Marine diesel engines. Based on the flow rate, pressure and thermal continuity conditions between the journal and the thrust component, the thermocompression coupling effect was considered. The transient time-varying load was considered in the lubrication analysis, and the coupling effect under the actual working conditions was discussed. A transient TEHD lubrication experimental platform for JTC bearings was established, and the established model was verified. It is found that the thermocompressive coupling effect between the journal and the thrust component has a significant influence on the transient lubrication behavior of JTC bearings and cannot be ignored. The coupling influence of different boundary conditions on transient lubrication characteristics such as axial clearance, radial clearance, radial load waveform, inclination Angle and inlet oil temperature was studied. This chapter provides theoretical support for the lubrication design of JTC bearings used in diesel engine crankshafts.