Oil-impregnated bearings - oilless bearings

Japanese: 含油軸受 - がんゆじくうけ（英語表記）oilless bearing

Also called oilless bearings. A bearing material made by sintering copper-zinc, copper-tin-lead, iron-copper alloys or pure iron powder into a porous material, and then soaking it in lubricating oil by vacuum suction or hot immersion. The oil content is usually 10-35%. The oil that has soaked into the pores is constantly seeping out onto the bearing surface due to capillary action and suction caused by the rotation of the shaft, so the oil supply is stable and there is little seizure. There is also an oil-impregnated cast iron bearing developed by Nippon Oiles Corporation. When cast iron is repeatedly heated, it expands as the flake graphite grows, causing fine cracks all over the surface. This is a drawback of cast iron growing, but it can be used to its advantage by soaking the cracks in oil to create an oil-impregnated bearing. It has the advantage of being able to manufacture large bearings.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

オイルレスベアリングともいう。銅-亜鉛，銅-スズ・鉛，鉄-銅系の合金または純鉄の粉末を多孔性に焼結し，真空吸入または加熱浸漬によって潤滑油をしみこませた軸受材。含油率は通常 10～35%。空孔にしみこんだ油は毛細管現象と軸回転による吸引のため絶えず軸受面に滲出するので，給油が安定し焼付きが少い特長がある。別に日本オイレス工業で開発した鋳鉄の含油軸受がある。鋳鉄を繰返し加熱すると片状黒鉛の成長とともに膨張して全面に細かくひびが入る。これは鋳鉄の成長という欠点であるがそれを逆用し，ひびに油をしみこませて含油軸受とする。大型軸受が製造できる利点がある。

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