基于正交试验的连杆大头轴承润滑影响因素研究

Exploring Lubrication Influence Factors of Big End Bearing of Connecting Rod with Orthogonal Experimental Design Method

为了更加准确地预测轴承性能,提高轴承工作可靠性和寿命。基于弹性流体动力润滑理论,建立了卧式两缸柴油机连杆大头轴承的弹性流体动力润滑仿真模型。应用正交试验设计方法,以最大油膜压力、最小油膜厚度以及平均总摩擦功耗为考察指标,研究了轴承间隙、轴瓦宽度、油孔位置角和曲柄销油孔直径等因素对轴承润滑性能的影响。研究结果表明:最优方案与原方案相比,最小油膜厚度增加44.86%,最大油膜压力降低1.00%,平均总摩擦功耗增加4.84%。

In order to predict the performance of a big end beating more accurately, then improve its reliability and life. We use the elastohydrodynamic lubrication theory to build the elastohydrodynamic lubrication model of the big end bearing of the connecting rod of a two-cylinder diesel engine. We apply the orthogonal experiment design method and use the indices such as peak oil film pressure, minimum oil film thickness and average total friction power loss to study the influence of the structural design parameters of the big end bearing such as clearance, width, oil hole posi- tion angle and oil hole diameter on its lubrication performance. The exploration results show that, in comparison of the optimal scheme with the original one, the minimum oil film thickness of the optimal scheme increases by 44. 86% ; its peak oil film pressure is reduced by 1.00%, and its average total friction power loss increases by 4.84%. Key words： connecting rods ; diesel engines ; elastohydrodynamic lubrication ; experiments ; film thickness ;