Oil-free bearing - oilless bearing

Japanese: 無給油軸受 - むきゅうゆじくうけ（英語表記）oilless bearing

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 porous bearings impregnated with oil or bearings with oil particles dispersed in them. 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. Porous materials include those made from powder sintering (iron, copper, aluminum, etc.), those that utilize the growth phenomenon of cast iron, those that utilize the base material of synthetic resin (phenolic resin), and those that utilize the fine crystals that form when metal solidifies (copper-based).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

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。多孔性の材料としては粉末焼結によるもの(鉄系，銅系，アルミ系など)，鋳鉄の成長現象を利用したもの，合成樹脂の基材の生地を利用したもの(フェノール樹脂)，金属の凝固時の結晶微細化を利用したもの(銅系)などがある。

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

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