Purpose

The purpose of this paper is to investigate the optimal design of micro-dimples on the bearing surface of the crankpin bearing (CB) to ameliorate the engine’s lubrication and friction (ELF).

Design/methodology/approach

A hydrodynamic model of the CB considering the influence of the asperity contact is built under the impact of the dynamic loading of the slider-crank-mechanism. The micro-dimples on non-slip surface of the bearing are designed and optimized based on the lubrication model and multi-objective genetic algorithm. The performance of optimal micro-dimples on ameliorating the ELF is analyzed and compared with that of optimal CB dimensions via the reduction of the solid contact force, friction force and friction coefficient between the crankpin and bearing surfaces; and the increase of the oil film pressure.

Findings

The optimal design of micro-dimples on the bearing surface may not only greatly ameliorate the ELF but also make the rotation of the crankpin inside the bearing more stable in comparison with the optimization of CB dimensions.

Originality/value

This study results not only clearly ameliorates the ELF but also can be applied to the slip/non-slip surface pairs of other journal bearings to enhance their lubrication performance.

中文翻译：

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曲柄销轴承表面的微凹痕的优化设计可改善发动机的润滑和摩擦

目的

本文的目的是研究曲轴销（CB）轴承表面上的微凹痕的最佳设计，以改善发动机的润滑和摩擦（ELF）。

设计/方法/方法

在滑块-曲柄机构的动态载荷的影响下，建立了考虑粗糙接触影响的CB流体力学模型。基于润滑模型和多目标遗传算法，设计并优化了轴承防滑表面的微凹痕。通过减少曲柄销和轴承表面之间的固体接触力，摩擦力和摩擦系数，分析了最佳微凹痕改善ELF的性能，并将其与最佳CB尺寸进行了比较。并增加油膜压力。

发现

与CB尺寸的优化相比，轴承表面上微凹痕的优化设计不仅可以大大改善ELF，而且可以使轴承内的曲柄销旋转更加稳定。

创意/价值

该研究结果不仅可以明显改善ELF，而且可以应用于其他轴颈轴承的滑动/防滑表面对，以增强其润滑性能。