Dry friction bearings

…Also called oilless bearings. They belong to the category of sliding bearings, and can be broadly divided into two types: oil-impregnated bearings and dry friction bearings. Oil-impregnated bearings are either those in which the bearing material is made porous and impregnated with oil, or those in which oil particles are dispersed within the bearing material. They are characterized by the fact that they lubricate the friction surface by supplying the right amount of oil at the right time in response to frictional heat between the shaft and the bearing, eliminating the need for constant oiling. …

*Some of the terminology used to refer to "dry friction bearings" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…オイルレスベアリングともいう。すべり軸受の範疇（はんちゆう）に属し，大別すると，含油軸受と乾燥摩擦軸受との2種がある。含油軸受は，軸受材質に多孔性をもたせてそこに油を含ませたものと，軸受材質内に油の粒子を分散させたものとがあり，軸と軸受との間の摩擦熱に伴い，適時，適量の油を摩擦面に供給させ潤滑することを特徴とし，常時給油をする手間を省いた軸受である。…

※「乾燥摩擦軸受」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報