Oilless bearings - Oilless bearings

Japanese: オイルレス軸受 - おいるれすじくうけ
Oilless bearings - Oilless bearings

…There are plastic bearings that require lubrication and those that do not. The former use phenolic resin, while the latter use nylon, Teflon, or acetal resin as the bearing material. Oil-impregnated bearings made of porous materials that contain oil are called oilless bearings or oil-free bearings because they do not require lubrication. In watches and instruments, jewel bearings made of highly wear-resistant materials such as sapphire and ruby ​​are used. …

From [Oil-free 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 porous bearing materials impregnated with oil, or bearing materials with oil particles dispersed within 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). …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…プラスチック軸受には潤滑を要するものと要さないものがあり,前者ではフェノール樹脂,後者ではナイロン,テフロン,アセタール樹脂などが軸受材料として用いられる。 油を含む多孔質材料で作られる含油軸受は,給油不要の意味でオイルレス軸受,あるいは無給油軸受と呼ばれる。時計,計器類では,耐摩耗性の大きいサファイア,ルビーなどを材料とする宝石軸受が用いられる。…

【無給油軸受】より

…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。…

※「オイルレス軸受」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

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