轴向柱塞泵回程球铰副油膜润滑压力形成机理研究

发布时间：2018-10-16 11:17

【摘要】：回程球铰副是应用于轴向柱塞变量泵的机械结构,为研究其空间相对运动特征,结合回程球铰副的几何特征与相对运动关系,提出基于柱面特征的油膜润滑机理分析模型。通过拓展经典JFO空化算法以考虑复杂表面剪切速度影响因素,建立回程球铰副油膜润滑数值分析方法;对比分析斜盘倾角7.5°、12.5°与17.5°3种典型工作条件下的润滑状态,以及摩擦副表面剪切速度分布、间隙形状分布、空化指数分布和压力分布之间的关系。研究结果表明:间隙形状引起的动压效应与表面剪切速度引起的伸缩效应共同决定油膜压力场具有"双峰双谷"的分布规律,伸缩效应与斜盘的倾斜程度呈正相关性,是导致润滑承载力下降的重要因素;回程球铰副润滑设计需综合考虑伸缩效应与动压效应对油液成膜过程的复合影响。
[Abstract]:The backhaul ball hinge pair is a mechanical structure used in axial piston variable pump. In order to study its spatial relative motion characteristics and the relationship between the geometric characteristics and relative motion of the return stroke ball hinge pair, an oil film lubrication mechanism analysis model based on cylinder characteristics is proposed. By extending the classical JFO cavitation algorithm to consider the influence factors of complex surface shear velocity, a numerical analysis method for oil film lubrication of backhaul spherical hinge pair is established, and the lubrication state of inclined disk under three typical working conditions, 7.5 掳, 12.5 掳and 17.5 掳, is compared and analyzed. The relationship between shear velocity distribution, gap shape distribution, cavitation exponent distribution and pressure distribution is also discussed. The results show that the dynamic pressure effect caused by the clearance shape and the stretching effect caused by the surface shear velocity jointly determine the distribution of the oil film pressure field with "double peaks and double valleys", and there is a positive correlation between the stretching effect and the inclined degree of the inclined disk. The lubrication design of backhaul spherical hinge pair should take into account the compound influence of the effect of expansion and dynamic pressure on the process of oil film formation.
【作者单位】：中国北方车辆研究所车辆传动重点实验室;北京理工大学北京电动车辆协同创新中心;
【基金】：国家自然科学基金青年科学基金项目(51605450)
【分类号】：TH322

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