ESTABLISHMENT OF THERMAL ELASTOHYDRODYNAMIC LUBRlCATION

热弹性流体动力润滑的建立

基本信息

批准号：
13450067
负责人：
NISHIKAWA Hiroshi
金额：
$ 9.34万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

When there is a difference in thermal conductivity of the contact materials in concentrated rolling/sliding contacts, the surface temperature of the material having a low thermal conductivity is higher than that of the material having a high thermal conductivity. Consequently, the temperature and viscosity of the lubricating oil vary across the oil film. In particular, when the surface velocity of the material having a low thermal conductivity is larger than that of the material having a high thermal conductivity, an extra pressure peak is generated, and thus a thick film or a dimple is formed by the temperature-viscosity wedge action. The film pressure peaks play an important role in the formation of dimple, and multi-dimples are caused by the cooperated interaction of the main pressure peak and pressure spike. The experimental results can be explained in more detail by considering three dimensional energy balance and non-Newtonian oil flow behavior. The other important results obtain … More ed are summarized as follows :1.In elliptical contacts, when the oil entrainment vector is directed along the minor principal axis of the contact ellipse, the dimples formed are stable, but when the entrainment vector is directed along the major principal axis, the dimples formed are unstable. The change of the entrainment angle plays an important role in the temperature distribution but does not influence the maximum temperature. The traction coefficient hardly depends on the entrainment angle.2.When the slide-roll ratio is small enough, the traction coefficient is controls by the compressive heating and non-Newtonian flow behavior. The effect of the viscous heating on the traction coefficient increases with increasing in the slide-roll ratio.3.In cases where the contacting materials have the same thermal conductivity, a larger thermal conductivity leads to a larger traction coefficient and overall film thickness. When the thermal properties of the contacting materials differ each other, the velocity of the surface having a high thermal conductivity should be larger than that having a low thermal conductivity, in order to prevent the rolling contact, fatigue. Less

当浓缩滚动/滑动触点中接触材料的热导率差异时，具有较低导热率的材料的表面温度高于具有高导热率的材料的表面温度。因此，润滑油的温度和粘度在整个油膜中各不相同。特别是，当具有较低热导率的材料的表面速度大于具有高导热率的材料的表面速度时，会产生额外的压力峰，因此，温度粘度楔形作用形成了厚膜或裂缝。薄膜压力峰在分裂的形成中起着重要作用，而多钉是由主压力峰和压力尖峰的协调相互作用引起的。可以通过考虑三维能量平衡和非牛顿油流动行为来详细解释实验结果。获得的另一个重要结果……更多的ED总结如下：1。在椭圆形触点中，当油入口向量沿着接触椭圆的次要主要轴定向时，形成的差异是稳定的，但是当入口向量沿着主要的主要轴定向时，差异是不稳定的。入口角的变化在温度分布中起重要作用，但不会影响最高温度。牵引系数几乎不取决于启蒙的角度。2。幻灯片滚动比足够小时，牵引力核心是通过压缩加热和非牛顿流动行为来控制的。粘性加热对牵引力核心对幻灯片较大的情况的较大的导电材料的较大的热量导电元素的增加，粘附核心对牵引力的影响会增加。厚度。当接触材料的热能彼此不同时，具有较高热导率的表面的速度应大于低导热率的速度，以防止滚动接触，疲劳。较少的