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<p>The main bearing of the TBM (tunnel boring machine) provides support for the cutter head, which significantly defines the penetration efficiency. In this paper, a dynamic model considering the impure lubrication condition is established on the basis of the elastohydrodynamic lubrication (EHL) theory. The results of the oil film thickness and pressure reveal that impurities significantly affect the oil film distribution. On the basis of the Reynolds equation and the roller slicing method, the dynamic characteristics of the main thrust roller considering impure lubrication are determined. When the fraction of impurities increases to 15%, the waviness of the lubricant distribution sharply increases. An unbalanced load is considered to simulate more realistic working conditions. By analyzing the vibration response while considering the impurities and unbalanced load, the model is validated on the basis of experiments. The simulation results strongly agree with the experimental results. This research reveals the significant effect of impurities on the dynamic characteristics of entire bearing systems. On the basis of the unbalanced load applied on the bearing, more practical working conditions underground are explored. This research establishes a framework to optimize the operation of TBMs under severe conditions.</p>

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Dynamic and lubrication analysis of the main bearing’s thrust roller under impure lubrication conditions

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Peng Zhou,
  • Qian Wang,
  • Wen Li,
  • Jiacan Xu,
  • Zinan Wang,
  • Zhan Wang

摘要

The main bearing of the TBM (tunnel boring machine) provides support for the cutter head, which significantly defines the penetration efficiency. In this paper, a dynamic model considering the impure lubrication condition is established on the basis of the elastohydrodynamic lubrication (EHL) theory. The results of the oil film thickness and pressure reveal that impurities significantly affect the oil film distribution. On the basis of the Reynolds equation and the roller slicing method, the dynamic characteristics of the main thrust roller considering impure lubrication are determined. When the fraction of impurities increases to 15%, the waviness of the lubricant distribution sharply increases. An unbalanced load is considered to simulate more realistic working conditions. By analyzing the vibration response while considering the impurities and unbalanced load, the model is validated on the basis of experiments. The simulation results strongly agree with the experimental results. This research reveals the significant effect of impurities on the dynamic characteristics of entire bearing systems. On the basis of the unbalanced load applied on the bearing, more practical working conditions underground are explored. This research establishes a framework to optimize the operation of TBMs under severe conditions.