In order to solve the wear failure of the rocker arm bushing when the fuel supply is sufficient, the local load condition of the rocker arm bushing is analyzed and the elasto-hydrodynamic lubrication（EHD） simulation is used to analyze the thickness of the rocker arm bushing lubricating oil film and the pressure distribution of the rocker arm bushing, and an improved scheme is proposed for simulation and test verification. The simulation results of the original rocker arm bushing show that the distribution of the total pressure on the bushing is uneven, which is main cause of bushing wear. After increasing the width of the bushing, the simulation and test results of rocker arm bushing show that the pressure on the bushing is evenly distributed, and the maximum wear in the diameter direction of the bushing is reduced from 0.336 mm to 0.090 mm. EHD simulation can be used to quantitatively predict the lubrication of the rocker arm bushing at the rocker arm design stage and improve the development efficiency.

试验以白蜡2 a生试验林中长势一致,无病虫害的8个优良无性系当年生枝条为试验材料,利用电导法(EL)及电阻抗图谱法(EIS)结合Logistic方程,拟合出8个白蜡优良无性系的半致死温度,并对其进行相关性分析.结果 表明,随着温度的降低,8个白蜡无性系的相对电导率均成上升趋势,由相对电导率拟合出的8个白蜡无性系的半致死温度由高到低依次为衡蜡2号、衡蜡9号、衡蜡7号、衡蜡11号、衡蜡3号、衡蜡6号、衡蜡4号、衡蜡1号;由3个电阻抗参数拟合出的8个白蜡无性系的半致死温度由高到低依次为衡蜡2号、衡蜡9号、衡蜡7号、衡蜡11号、衡蜡3号、衡蜡6号、衡蜡4号、衡蜡1号.与电导法(EL)得到的顺序相同,弛豫时间分布系数(ψ)与相对电导率、胞外电阻率(re)及胞内电阻率(ri)均成极显著相关,相关系数分别为0.931、0.930、0.970.弛豫时间分布系数(ψ)可作为测定白蜡抗寒性的最佳参数.