Purpose

This paper aims to research the effect of the different structures of dimpled textures on the rod bearing surfaces on improving the engine’s lubrication efficiency and friction power loss (LE-FPL).

Design/methodology/approach

Based on the hydrodynamic model of the rod bearing, the effect of different structures of dimpled surfaces including circular dimples (CD), square dimples (SD), wedge-shaped dimples (WSD), circular-square dimples (CSD) and square-wedge-shaped dimples (SWSD) on ameliorating the LE-FPL is analyzed under the different operating conditions of the engine. The oil film pressure (p), asperity contact force (W_ac), friction force (F_f) and coefficient of friction (COF) of the rod bearing are chosen to evaluate the LE-FPL.

Findings

The SD’s performance on improving the LE-FPL is better than all other structures of the CD, WSD, CSD and SWSD. Particularly, the average values of W_ac, F_f and COF with the SD is significantly reduced by 14.5%, 28.5% and 33.3% compared to the optimal dimensions of the rod bearing; and by 26.4%, 34.5% and 43.7% compared to the optimal CD (n = m = 6).

Originality/value

The generated friction between surfaces of rod bearings of the engine not only reduces the engine power but also affects the durability of the structures. Thus, the optimal design of the SD to further improve the LE-FPL is very necessary.

中文翻译：

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不同结构凹痕纹理对提高发动机LE-FPL的研究

目的

本文旨在研究连杆轴承表面不同结构的凹痕纹理对提高发动机润滑效率和摩擦功率损失（LE-FPL）的影响。

设计/方法/方法

基于杆轴承的流体动力学模型，包括圆形凹坑（CD）、方形凹坑（SD）、楔形凹坑（WSD）、圆形方形凹坑（CSD）和方形楔形凹坑表面的不同结构的影响分析了在发动机不同工况下改善 LE-FPL 的形凹坑 (SWSD)。选择杆轴承的油膜压力 ( p )、凹凸接触力 ( _Wac )、摩擦力 ( _Ff ) 和摩擦系数 (COF) 来评估 LE-FPL。

发现

SD在改进LE-FPL方面的表现优于CD、WSD、CSD和SWSD的所有其他结构。特别是，W _ac、F _f和COF的平均值与SD 相比，与杆轴承的最佳尺寸相比，显着降低了14.5%、28.5% 和33.3%；与最佳 CD ( n = m = 6)相比分别提高了 26.4%、34.5% 和 43.7% 。

原创性/价值

发动机连杆轴承表面之间产生的摩擦不仅会降低发动机功率，而且会影响结构的耐用性。因此，对 SD 进行优化设计以进一步改进 LE-FPL 是非常必要的。