| 摘要 |
The purpose of the present invention is to provide a bearing for a motor-type fuel pump that has corrosion resistance against poor-quality gasoline that includes sulfur or organic acids, that, because of resistance to wear and outstanding conformability with a coupled shaft, can be used favorably even in compact fuel pumps, and that is made of a novel Zn-P-Ni-Sn-C-Cu-based sintered alloy. The bearing is characterized by having a structure in which contained are, by weight, 3-13% Zn, 0.1-0.9% P, 10-21% Ni, 3-12% Sn, and 1-8% C, with the remainder consisting of Cu and unavoidable impurities, in which an Sn alloy phase that comprises at least 15% Sn by weight is formed on grain boundaries of a base comprising a solid solution phase of a Zn-Ni-Sn-Cu alloy, and in which the porosity is 8-18%, and free graphite is distributed in the pores. |
