Generally, for non liquid lubricated sliding bearings, as the speed increases, the heat generation also increases, and the temperature also rises. Excessive rotational speed often leads to tile burning. The emergence of rolling bearings has significantly increased the allowable rotational speed of the shaft. However, when developing machines with higher rotational speeds, rolling bearings also encounter many problems. The bearings that can adapt to higher speeds are liquid friction sliding bearings.
As early as over 100 years ago, people discovered in production practice that certain sliding bearings, under conditions of high load capacity and extremely high speed, have minimal wear, low temperature, and slow rise. Why is that? After in-depth research, it was found that the lubricating oil formed a very complete oil film with fluid pressure, which supported the shaft and completely isolated the journal from the bearing, preventing them from contacting each other. That is to say, the shaft and the tile are in a state of liquid friction. At this time, the friction coefficient is only 0.001-0.008, which is very small. In this way, the friction resistance is low, the wear is extremely slow, and this oil film has a buffering effect, which can effectively alleviate external vibrations or impacts, and the noise during operation is also very weak. Although this phenomenon was discovered early, its actual application was only in the last century, less than a hundred years ago.
There are currently two types of liquid friction sliding bearings: dynamic pressure bearings and static pressure bearings. Relatively speaking, static pressure sliding bearings are later, and vertical grinding flat tiles belong to static pressure lubrication.
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