鋼裏金付きCu-Sn-P-Pb-グラファイト新軸受材料の特性

抄録

Sintered lead bronze alloys with steel backing have been widely used as the bearing material of wrapped type bushings, because of their high loading capability and wear resistance under the boundary lubrication. Small end bearings of connecting rods in the automotive engines are the typical application of these.
As the recent automotive components are applied on severe conditions, such as higher load, higher temperature, newly advanced materials have been demanded for bearings having properties of higher loading capability, lower friction loss or better wear resistance.
Authors have studied on a new sintered Cu-Sn-P-Pb-Graphite bearing material with steel backing for such demands as the above by carrying out the friction and wear tests with the bushing type test machine and also, by conducting the engine bench test for the small end bearing of connecting rod.
Through these tests it was found that this Cu-Sn-P-Pb-Graphite material showed better friction and wear properties, compared with conventional lead bronze, due to the better alloy structural stability of the material itself against the high load under the high temperature and the solid lubricating effect of dispersed graphite in the material, at the condition of metalcontacting with the shaft.