| 摘要 |
Disclosed is an oil-impregnated sintered bearing in which local relative sliding between the oil-impregnated sintered bearing and the shaft is avoided, thereby mitigating stress concentration on the bearing surface of the oil-impregnated sintered bearing. An oil-impregnated sintered bearing 1 which has in its inner periphery a bearing surface 1 a making relative sliding with the outer peripheral surface 22 a of a shaft 22 and which has at both axial ends of the bearing surface 1 a crowning portions 1 c which are of a configuration satisfying the following conditions: 1.75x10<SUP>-3</SUP><=gamma/b 1<= 5.2x10<SUP>-2</SUP>, and 1.75x10<SUP>-3</SUP><=gamma/b 2 <=5.2x10<SUP>-2</SUP>, and 0.2<=(b 1+ b 2 )/a<=0.8, where gamma is the maximum radial drop amount of the crowning portions 1 c, b 1 is the axial length of the crowning portion 1 c at one axial end; b 2 is the axial length of the crowning portion 1 c at the other axial end; and a is the total axial length of the oil-impregnated sintered bearing 1.
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