Plain bearings are the simplest form of bearing available as they have no moving parts. They are, quite often, simply a cylinder, though the design of the bearing does differ depending on the intended motion. The three designs include: journal, linear and thrust.
期刊样式轴承旨在支持径向运动，其中轴在轴承内旋转。线性轴承通常用于需要幻灯片板的应用中，因为这些轴承旨在允许其名字的线性运动允许运动。最后，纯推力轴承的设计与其滚筒轴承对应物的工作相同，但不用使用锥形滚动元件，而是使用轴承垫在圆柱体周围圆形上排列的垫子。这些垫子在垫子和旋转磁盘之间的轴承内形成楔形区域，该磁盘在旋转磁盘之间，该磁盘支持施加的推力并消除金属对金属接触。
在所有可用的轴承类型中，普通轴承往往是最便宜的。它们可以由多种材料制成，包括青铜，石墨和塑料，例如尼龙，PTFE和多乙烯。材料特性的改善使塑料普通轴承近年来越来越受欢迎。但是，所有类型的普通轴承都是轻巧的，紧凑的，可以承受重大负载。
As far as lubrication is concerned, some plain bearings require outside lubrication while others are self lubricating. Plain bearings made of bronze or polyacetal, for example, contain lubricant within the walls of the bearing, but require some outside lubrication to maximize performance. For other plain bearings, the material itself acts as the lubricant. Such is the case with bearings made from PTFE or metalized graphite.
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