Industrial Lubrication and Tribology ( IF 1.6 ) Pub Date : 2021-02-08 , DOI: 10.1108/ilt-06-2020-0215 Qiancheng Qin , Xue-Feng Wang , Rufu Hu , Xiaomin Cheng
Purpose
This study aims to investigate the effects of single dent on the film thickness and pressure in elastohydrodynamically lubricated (EHL) point contacts by numerical analysis.
Design/methodology/approach
The governing equations of single dent were established and then the variations of the film thickness and pressure induced by the applied load, the entrainment velocity and the ball radius were investigated. Meanwhile, the film thickness and pressure under smooth and dented surfaces were compared with each other.
Findings
The dent enhances both the maximum pressure and the second pressure peak. The minimum film thickness arises before the dent under certain conditions. In the meantime, the pressure decreases at the inside of the dent and the film thickness is just the reverse. The entrainment velocity remarkably affects the overall film thickness, whereas the rest of the input parameters mainly decides the details of the film curve. All input parameters remarkably affect the overall pressure, especially the maximum pressure.
Originality/value
This work is helpful to understanding the effect of the single dent on the lubricating properties of EHL point contacts.
中文翻译:
EHL点接触中单凹痕的数值研究
目的
本研究旨在通过数值分析研究单凹痕对弹性流体动力润滑(EHL)点接触膜厚度和压力的影响。
设计/方法/方法
建立了单凹痕的控制方程,然后研究了施加载荷引起的膜厚和压力,夹带速度和球半径的变化。同时,比较了光滑和凹陷表面下的膜厚度和压力。
发现
凹痕增强了最大压力和第二压力峰值。在某些条件下,最小膜厚度出现在凹痕之前。同时,在凹痕内部的压力降低,并且膜厚度恰好相反。夹带速度显着影响整个膜的厚度,而其余输入参数主要决定膜曲线的细节。所有输入参数都会显着影响总压力,尤其是最大压力。
创意/价值
这项工作有助于理解单个凹痕对EHL点接触润滑性能的影响。