Sintered bearing

摘要

With use of a fine copper-based powder, specifically a copper-based powder that contains particles each having a diameter of 45 μm or less by 80 weight % or more, an air permeability can be significantly reduced. When this copper-based powder is used, a sintered metal can be easily formed to contain copper by 40% or less (contain iron by 60% or more) to enhance abrasion resistance, and to have an oil permeability of 1.00 g/10 min or less to increase an oil film formation rate.

主权项

1. A sintered bearing, which is made of a copper-iron-based sintered metal obtained by sintering a compact formed by compressing a copper-based powder and an iron-based powder, the sintered bearing having an inner peripheral surface which functions as a radial bearing surface,
wherein the copper-based powder contains particles each having a diameter of 45 μm or less by more than 80 weight %, wherein the copper-iron-based sintered metal contains copper by 40 weight % or less and iron by 60 weight % or more, and wherein the copper-iron-based sintered metal has an oil permeability of 1.00 g/10 min or less.