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本文采用数值分析方法研究了偏心轮-挺杆副的微热弹性流体动力润滑问题.分析中假设平面挺杆表面分布有余弦波纹,探讨了偏心距和余弦波波长对润滑油膜变化的影响.数值模拟计算结果表明:在偏心轮-挺杆副工作的一个周期里,表面波纹度的存在会导致油膜压力和温度上升.在不同的滑滚比条件下,表面波纹的弹性变形程度不同.在两表面反向运动的半个周期内,随偏心距的增加,滑滚比也增加,导致表面波纹的变形程度降低.在两表面反向运动的半个周期内,波纹的弹性变形程度受“温度-黏度楔”机理的控制.
In this paper, the numerical analysis is used to study the thermo-dynamic hydrodynamic lubrication of the eccentric-lifter pair. The analysis assumes that there is a cosine ripple on the surface of the lifter, and the influence of eccentricity and cosine wavelength on the variation of lubricant film is discussed. The simulation results show that the surface waviness causes the oil film pressure and temperature to rise during one cycle of eccentric wheel-tappet work, and the elastic deformation of the surface waviness is different under different conditions of slip ratio. Within half cycle of the reverse movement of the surface, as the eccentricity increases, the sliding-to-roll ratio also increases, resulting in the decrease of the deformation of the surface corrugations. The degree of elastic deformation of the corrugations during the half cycle of the reverse movement of the two surfaces is affected by the “ Temperature - viscosity wedge ”mechanism of control.