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A Basic Study on Thermo-Elasto-Plastic Mixed Hydrodynamic Lubrication Problems

热弹塑性混合流体动力润滑问题的基础研究

基本信息

批准号：
02452111
负责人：
YAMAMOTO Minoru
金额：
$ 3.2万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

The lubrication condition between an elastic socket and a glas sphere subjected to a sinusoidal load was observed by a miniature ITV camera through the glass sphere. Generation of a cavitation zone around the contact area were observed in the load reducing phase. A high subambient pressure was measured in the cavity and it was reduced when the area of cavity increased with the progress of the time. The difference of the curvature between the surfaces plays an important roll in deciding the mode of lubrication. If the conformity is low, highly concentrated contact occurs over a short period of time. On the other hand, if the both surfaces are highly conformed, the fluid is kept between two surfaces and considerably high fluid pressure is generated over a wide area and then, the contact pressure is kept low at the center. However, the maximum contact pressure occurs not in the center but near the outside edge. Judging from the above results, the conformity must be selected carefully to reduce wear and it is important to chose the shape of two surfaces near the edge to reduce contact pressure and their wear. A new elasto-sixed lubrication theory was developed and the results were compared with those from the experiments and both agreed well.Mixed lubrication between two parallel surfaces were also investigated using a pin and disc. When the bearing number increased, transition from mixed lubrication to fluid lubrication occurred and the friction coefficient was reduced significantly to 0.01. A theoretical model was developed for the contact between two rough surfaces and also the thermal distortion of the shape of the pin was also considered. The reason to show such a small friction between two parallel surfaces was found to be the change of the shape of the pin due to heating.

通过微型ITV摄像机透过玻璃球观察承受正弦载荷的弹性套筒和玻璃球之间的润滑状况。在负载减少阶段观察到接触区域周围产生空化区。在空腔中测量到较高的低于环境压力，并且当空腔面积随着时间的推移而增加时，该压力降低。表面之间曲率的差异在决定润滑方式方面起着重要作用。如果整合度低，就会在短时间内发生高度集中的接触。另一方面，如果两个表面高度一致，则流体保持在两个表面之间，并且在大面积上产生相当高的流体压力，然后，接触压力在中心保持较低。然而，最大接触压力不是出现在中心，而是出现在外边缘附近。从以上结果来看，必须仔细选择一致性以减少磨损，并且重要的是选择靠近边缘的两个表面的形状以减少接触压力及其磨损。提出了一种新的弹力润滑理论，并将结果与实验结果进行了比较，两者吻合良好。还使用销和盘研究了两个平行表面之间的混合润滑。当轴承数量增加时，由混合润滑向流体润滑转变，摩擦系数显着降低至0.01。开发了两个粗糙表面之间接触的理论模型，并且还考虑了销形状的热变形。两个平行表面之间显示如此小的摩擦的原因被发现是由于加热导致销的形状发生变化。