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Suface Failure Prevention Method at the Start-Stop of CVT

CVT启停时表面故障的预防方法

基本信息

批准号：
14550127
负责人：
OHNO Nobuyoshi
金额：
$ 2.18万
依托单位：
Saga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550127/
关键词：
Tribology t-CVT EHL Traction oil Solidification Rheology High pressure Phase diagram

项目摘要

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

1.基于相图的八种合成润滑剂的高压流变性首次利用高压密度实验结果等绘制了压力为12 Gpa、温度为303K~353K的润滑油相图。对油品进行了高压粘度实验。基于自由体积理论，建立了压力温度与密度、粘度的关系式。结果表明，与Dowson和Roelands关系式相比，新的关系式能更好地预测高压流变学。此外，还证明了Ehrenfest方程或相图的梯度与自由体积的膨胀系数密切相关。2.牵引流体的高压短时行为研究了牵引流体在冲击载荷下的挤压成膜能力。压粘系数和粘度的影响是inv…。更多的是关于塑料冲击的调查。润滑表面凹坑深度与干凹坑深度之差随压粘系数a和粘度αη的乘积η线性增大。从接触电压或轧制条件下的弹流中心膜厚度测量可以看出，在挤压成膜能力下，润滑剂参数αη的重要性。每一次碰撞的强度都是通过声发射(AE)传感器测量的。通过冲击试验的凹坑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凝固。3.提出了基于干涉测量的t-CVTA方法停机时的表面失效预防方法，用于实验测量非稳态条件下EHD膜厚的瞬变变化。目前，该方法使用高速数字摄像机每秒获得125个胶片厚度或胶片轮廓测量。在EHL关闭过程中，停止时会形成石油的圈闭。油膜厚度与压粘系数αη、粘度n和减速a的乘积α成线性关系，接触后的漏油是流体特有的。包裹油的挤出周期由平均赫兹压力p的乘积αp和油的压力-粘滞系数α决定。较少