Suface Failure Prevention Method at the Start-Stop of CVT

1.基于相图的八种合成润滑油的高压流变性首先利用高压密度实验结果和其他资料，绘制了压力为L2GPa，温度为303 - 353K的油的相图。对油品进行了高压粘度实验。基于自由体积理论，提出了压力=温度与密度、粘度的关系。结果表明，由这些关系式得到的新方程比Dowson和Roelands的方程更能准确地预测高压流变性。实验结果表明，Escherfest方程或相图梯度与自由体积膨胀系数密切相关。2.牵引液的高压短时行为研究了牵引液在冲击载荷作用下的挤压成膜能力。研究了压力-粘度系数和粘度的影响 ...更多信息 进行了塑料撞击测试。润滑表面凹陷深度与干凹陷深度之差与压粘系数α和粘度η的乘积α η成线性关系。通过接触电压或滚动状态下弹流中心膜厚的测量，考察了润滑参数α η对挤压油膜形成能力的重要性。通过声发射（AE）传感器测量每次碰撞的强度。通过冲击试验后的压痕分析和冲击载荷下的声发射分析，证实了牵引液的高压短时固化。3.提出了基于干涉法的t-CVTA停机表面失效预防方法，用于非稳态条件下瞬态EHD膜厚变化的实验测量。目前，该方法通过使用高速数字摄像机每秒获得125个膜厚度或膜轮廓测量。在EHL停车时，油的截留在停机时形成。截留膜厚度与压粘系数α、粘度n和减速度a的乘积α η a呈线性关系。接触后的油泄漏是流体特有的。平均赫兹压力p与原油压粘系数α的乘积α p决定了原油的挤出周期。少

1.High-Pressure Rheology of Eight Synthetic Lubricants Based on Phase DiagramsThe phase diagram was first plotted for oils, up to pressure L2GPa and temperature from 303K to 353K using the high pressure density experiment results and others. The high pressure viscosity experiment was done for oils. Then the relationship between pressure=temperature with density and viscosity was proposed based on free volume theory. It was found that the new equations from these relationships could predict the high pressure rheology more closely than that of Dowson and Roelands. Moreover it was shown that the Ehrenfest equation or the gradient of the phase diagram is closely related to the expansion coefficient of free volume.2.High-Pressure Short Time Behavior of Traction FluidsThe squeeze film formation ability of traction fluids is studied under impact load by falling bearing steel ball against a flat anvil made of mild steel. The effect of the pressure-viscosity coefficient and the viscosity is inv … More estigated for plastic impact. The difference of depth of the lubricated surface dent and the dry dent increases linearly with the product αη of the pressure-viscosity coefficient a and the viscosity η The importance of lubricant parameter αη is observed under the squeeze film formation ability from contact voltage or EHL central film thickness measurement at rolling condition. The intensity of each impact collision is measured by means of an acoustic emission (AE) sensor. The high-pressure short time solidification of traction fluids were confirmed by the analysis of dent after the impact tests and AE analysis under impact loads.3.Surface Failure Prevention Method at Halting of t-CVTA method based on interferometry has been developed for experimentally measuring transient, changes in EHD film thickness in non-steady state conditions. At present the method obtains 125 film thickness or film profile measurements per second by using a high speed digital video camera. In EHL shut down, the entrapments of oil form upon halting. The entrapped film thickness increases linearly with the product αη a of pressure-viscosity coefficient α, the viscosity n and the deceleration a. The subsequent leakage of oil from contact is fluid specific. The periods of squeeze out of entrapped oils are conditioned by the product α p of mean Hertzian pressure p and the pressure-viscosity coefficients α of oils. Less