초록 ▼

The invention relates to a bearing for supporting a moving member having a surface of a first arithmetical mean roughness. This bearing is made of an abrasion-resistant aluminum alloy containing 14.0-17.5 wt% of Si, 2.0-5.0 wt% of Cu, 0.1-1.0 wt% of Mg, 0.3-0.8 wt% of Mn, 0.1-0.3 wt% of Cr, 0.05-0.2

The invention relates to a bearing for supporting a moving member having a surface of a first arithmetical mean roughness. This bearing is made of an abrasion-resistant aluminum alloy containing 14.0-17.5 wt% of Si, 2.0-5.0 wt% of Cu, 0.1-1.0 wt% of Mg, 0.3-0.8 wt% of Mn, 0.1-0.3 wt% of Cr, 0.05-0.20 wt% of Ti, 0.003-0.05 wt% of P, not greater than 1.5 wt% of Fe, less than 0.005 wt% of Ca, and aluminum as a remainder. The aluminum alloy contains silicon primary crystals, and first and second intermetallic compounds. Each of the silicon primary crystals and these intermetallic compounds has an average particle diameter from 8 to 30 .mu.m. The silicon primary crystals and the first and second intermetallic compounds respectively have first, second and third fractions each ranging from 5 to 40 .mu.m in particle diameter. The total area of the first, second and third fractions on a two-dimensional section of the alloy is from 5 to 10% by area, based on the total area of the section. The bearing has a surface having a second arithmetical mean roughness which is greater than the first one and is from 0.3 to 3.0 .mu.m. The bearing is superior in abrasion resistance, seizure resistance and running-in characteristic, and is capable of reducing abrasion even if used under a condition of inferior lubrication.

대표청구항 ▼

[ What is claimed is:] [1.] A bearing for supporting a member which is intended to move relative to said bearing and has a surface having a first arithmetical mean roughness, said bearing being made of an abrasion-resistant aluminum alloy comprising: 14.0-17.5 wt% of Si, 2.0-5.0 wt% of Cu, 0.1-1.0 w

[ What is claimed is:] [1.] A bearing for supporting a member which is intended to move relative to said bearing and has a surface having a first arithmetical mean roughness, said bearing being made of an abrasion-resistant aluminum alloy comprising: 14.0-17.5 wt% of Si, 2.0-5.0 wt% of Cu, 0.1-1.0 wt% of Mg, 0.3-0.8 wt% of Mn, 0.1-0.3 wt% of Cr, 0.05-0.20 wt% of Ti, 0.003-0.05 wt% of P, not greater than 1.5 wt% of Fe, less than 0.005 wt% of Ca, and aluminum as a remainder,wherein said aluminum alloy contains silicon primary crystals having an average particle diameter from 8 to 30 .mu.m, a first intermetallic compound of aluminum, silicon and iron, and a second intermetallic compound of aluminum, silicon, iron, manganese and chromium, each of said first and second intermetallic compounds having an average particle diameter from 8 to 30 .mu.m,wherein said silicon primary crystals and said first and second intermetallic compounds respectively have first, second and third fractions each ranging from 5 to 40 .mu.m in particle diameter,wherein a total area of said first, second and third fractions on a two-dimensional section of said aluminum alloy is from 5 to 10% by area, based on the total area of said section, andwherein said bearing has a surface having a second arithmetical mean roughness which is greater than said first arithmetical mean roughness of said member and is from 0.3 to 3.0 .mu.m, said first and second arithmetical mean roughnesses being in accordance with Japanese Industrial Standard JIS B 0601-1994.