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首页> 外文会议>American Society of Mechanical Engineers(ASME)/Society of Tribologists and Lubrication Engineers(STLE) International Joint Tribology Conference 2004(IJTC 2004) vol.1 pt.A; 20041024-27; Long Beach,CA(US) >EFFECT OF PERFLUOROPOLYETHER FLUIDS ON LIFE OF THRUST BALL BEARINGS
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EFFECT OF PERFLUOROPOLYETHER FLUIDS ON LIFE OF THRUST BALL BEARINGS

机译：全氟橡胶流体对推力球轴承寿命的影响

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摘要

Perfluoropolyether (PFPE) fluids are used on magnetic recording media, aerospace industry and satellite instruments satisfactorily. Recently these oils have been used as hydraulic fluids, high temperature liquid lubricants in turbine engines and base oils of high-temperature greases. Despite considerable research on PFPE, the rheological characteristics at high pressure and their effects on life of ball bearings have not been investigated properly. First, high pressure density measurement of three kind of commercial PFPE fluids fluid K, Fluid D and Fluid F) was done from temperature 293K to 333K and pressure up to 1.2 GPa for estimation of free volume. The density - pressure -temperature relation and viscosity - pressure - temperature relation of PFPE fluids were proposed based on the free volume and the phase diagram. Next, the effect of PFPE fluids on ball bearings fatigue life was carried out by systematic tests using thrust ball bearings. The general tendency of PFPE fluids shows that bearing life increases with the film parameter. However, beneficial effect of high film parameter of Fluid F is considered that it is disturbed by permanent viscosity loss. The elastohydrodynamic lubrication (EHL) film thickness were studied and compared with experimental measurements. The results show that Fluid F, which contains an acetal group (-OCF_2O-), at high shear rate in EHL inlet side the viscosity was decreased by mechanical shear and the EHL oil film was not easily formed. In the case of Fluid F, thus contacts occur in ball bearings and shorten the bearings life thereby.
机译：全氟聚醚（PFPE）流体令人满意地用于磁记录介质，航空航天工业和卫星仪器。最近，这些油已被用作液压油，涡轮发动机中的高温液体润滑剂和高温润滑脂的基础油。尽管对PFPE进行了大量研究，但尚未对高压下的流变特性及其对滚珠轴承寿命的影响进行适当研究。首先，从温度293K到333K以及压力高达1.2 GPa的压力下对三种商用PFPE流体（流体K，流体D和流体F）进行高压密度测量，以估计自由体积。基于自由体积和相图，提出了PFPE流体的密度-压力-温度关系和粘度-压力-温度关系。接下来，通过使用推力球轴承的系统测试，进行了PFPE流体对球轴承疲劳寿命的影响。 PFPE流体的总体趋势表明，轴承寿命随薄膜参数的增加而增加。然而，流体F的高膜参数的有益效果被认为是永久性粘度损失所干扰。研究了弹性流体动力润滑（EHL）膜的厚度，并与实验测量结果进行了比较。结果表明，含有乙缩醛基（-OCF_2O-）的流体F在EHL入口侧的高剪切速率下，由于机械剪切作用而使粘度降低，并且不易形成EHL油膜。因此，在流体F的情况下，滚珠轴承会发生接触，从而缩短轴承寿命。

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