IRON-COPPER-BASED OIL-IMPREGNATED SINTERED BEARING AND METHOD FOR MANUFACTURING SAME

• Main Authors: ISHII, Yoshinari, TSUKADA, Yasuhiro, OBATA, Tomoe
• Format: Patent
• Language: English; French; German
• Published: 05.06.2019
• Subjects: ALLOYS; BEARINGS; BLASTING; CASTING; CHEMISTRY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MECHANICAL ENGINEERING; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS; WORKING METALLIC POWDER

Provided is a novel iron-copper-based oil-impregnated sintered bearing exhibiting a less of a hard iron alloy phase, and having an excellent wear resistance and cost performance under a low-revolution and high-load use condition such as that involving an output shaft used in an electric motor of an automobile; and a method for producing such sintered bearing. The sintered bearing contains Cu: 10 to 55% by mass, Sn: 0.5 to 7% by mass, Zn: 0 to 4% by mass, P: 0 to 0.6% by mass, C: 0.5 to 4.5% by mass and a remainder composed of Fe and inevitable impurities. An area ratio of a free graphite dispersed in a metal matrix of the bearing is 5 to 35%; a porosity thereof is 16 to 25%; a hardness of an iron alloy phase in the matrix is Hv 65 to 200; and raw material powders employ at least one of a crystalline graphite powder and a flake graphite powder each having an average particle size of 10 to 100 µm.