| 摘要 |
PROBLEM TO BE SOLVED: To attain prevention of generation of noise and suppression of slide abrasion by improving sliding characteristics at slide starting especially under low temperature environment at slide starting of an oil-impregnated sintered bearing. SOLUTION: At the inside of the oil-impregnated sintered bearing, a large number of pores 3 exist singly or in the state that the plurality of pores 3 are communicated with each other. A large number of pores 3 are impregnated with a lubricant, and on the surface of the pores 3, a covering film (oil-repellent cover film) 5 indicating oil-repellency relative to the lubricant to be impregnated is formed. The oil-repellent covering film 5 is formed not only on a surface of the pore 3 at a bearing central part but also on a surface of the pore 3 opened to the bearing surface. The oil-repellent covering film 5 is removed from the bearing surface for substantially sliding/supporting the shaft, and an outer surface of the sintered body containing Fe and Cu as main components constitutes the bearing surface. COPYRIGHT: (C)2009,JPO&INPIT
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