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Oilite
Oilite is a porous bronze or iron alloy commonly impregnated with an oil lubricant and used in bearings. The original Oilite and Oilite Plus are bronze alloys, while Super Oilite and Super Oilite 16 are iron-based. Oilite was developed by Chrysler in 1930,〔 originally for use in bearings for water pumps and spring shackles, and without oil as the porous filter element in gasoline filters. Chrysler sold approximately 500,000 Oilite bearings in 1930 and approximately 2.5 million the next year. The Super Oilite was introduced in 1932. Overall sales of all Oilite material in 1932 was seven million; this rose to 18 million in 1933. Oilite was a profit center for Chrysler during this time. Currently, the Oilite trademark belongs to Beemer Precision.
==Composition==
Oilite is formed using powder metallurgy so that tiny pores are present in the metal. The pores are then vacuum impregnated with an oil to improve the materials bearing ability. The material holds approximately 20% oil by volume. The most common lubricant is SAE 30 oil.
Due to the porous structure, machining Oilite poses a special situation. To machine Oilite, the cutting tool must be—and stay—sharp; therefore, tungsten carbide is often used. The sharp tool preserves the open-pore structure, because a dull tool would smear the material and close up the pores that are on the surface adjacent to the journal, which is where the lubrication needs to be. Reaming is not recommended, but can be done with an extremely sharp tool. Honing and grinding should not be performed on any surface that is in contact with the journal as these processes always smear the pores.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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