BEARING MADE OF COPPER BASED SINTERED ALLOY OF MOTOR TYPE FUEL PUMP AND MOTOR TYPE FUEL PUMP INCORPORATED WITH THE BEARING

摘要

PROBLEM TO BE SOLVED: To provide a bearing of a motor type fuel pump which exhibits excellent wear resistance under the high pressure and high speed circulation of a liquid fuel. SOLUTION: The bearing of a motor type fuel pump consists of a Cu based sintered alloy having a composition containing, by mass, 10 to 25% Ni, 10 to 25% Zn, 0.1 to 0.9% P, 0.5 to 5% C and 0.5 to 5% MoS2 , and the balance Cu with inevitable impurities, having a structure in which a hard Cu-P compound, free graphite having lubricity and MoS2 are dispersedly distributed into a base of a solid solution phase of a Cu-Ni-Zn based alloy, and having a porosity of 5 to 25% as well.