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1. (WO2018021501) IRON-COPPER-BASED OIL-IMPREGNATED SINTERED BEARING AND METHOD FOR MANUFACTURING SAME

Pub. No.:    WO/2018/021501    International Application No.:    PCT/JP2017/027339
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Fri Jul 28 01:59:59 CEST 2017
IPC: B22F 5/00
B22F 1/00
C22C 9/00
C22C 33/02
C22C 38/00
F16C 33/12
F16C 33/14
Applicants: DIAMET CORPORATION
株式会社ダイヤメット
Inventors: ISHII, Yoshinari
石井 義成
TSUKADA, Yasuhiro
塚田 康博
OBATA, Tomoe
小畑 智恵
Title: IRON-COPPER-BASED OIL-IMPREGNATED SINTERED BEARING AND METHOD FOR MANUFACTURING SAME
Abstract:
Provided are a novel iron-copper-based oil-impregnated sintered bearing and a method for manufacturing the same, the bearing having minimal hard iron alloy phases and excellent wear resistance and cost performance in a low-rotation, high-load usage condition such as in the output shaft of an electric motor for an automobile. An iron-copper-based oil-impregnated sintered bearing including 10-55% by mass of Cu, 0.5-7% by mass of Sn, 0-4% by mass of Zn, 0-0.6% by mass of P, and 0.5-4.5% by mass of C, the remainder comprising Fe and unavoidable impurities, wherein the area ratio of free graphite dispersed in a metal matrix thereof is 5-35%, the porosity thereof is 15% to 25%, and the hardness of an iron alloy phase in a base thereof is Hv 65-200. In the present invention, flake graphite powder and/or scaly graphite powder having an average particle diameter of 10-100 µm is used.