Sliding bearing and manufacturing method thereof

Abstract

A sliding bearing having an improved load-carrying capacity and fatigue strength, by sintering a molded body of iron-based metal mixture powder and concurrently bonding the same to steel-backed metal layer, in which a lubricating oil having the optimal lubrication conditions is impregnated, and providing convenient maintenance and management thereof due to an increased grease non-supplying period, and a manufacturing method of the same. A sliding bearing includes a steel-backed metal layer, and an iron-based sintered alloy layer formed of copper of 10-30 wt % and iron for the residue. The iron-based sintered alloy layer is sintered and concurrently bonded to the steel-backed metal layer. A bush type sliding bearing is formed by inserting a steel-backed metal layer into a mold of a press having cavity for installation of a core at the central portion of the mold and a lower pressing member at the lower portion thereof; filling metal mixture powder formed of copper of 10-30 wt %, graphite of 6.5 wt % or less, and iron for the residue between the core and the steel-backed metal layer and then inserting an upper pressing member into the upper portion of the mold; forming the metal mixture powder into a molded body by selectively applying pressure of 50-300 kgf/cm.sup.2 to the upper pressing member and/or the lower pressing member, respectively; and sintering the molded body into a sintered alloy layer by maintaining the molded body together with the steel-backed metal layer under predetermined gas atmosphere at temperature of 1,065.degree. C.-1,095.degree. C. for 3-25 minutes and concurrently bonding the sintered alloy layer to the steel-backed metal layer.

Dependencies are inferred from the claim text.