| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing for a motor-type fuel pump, which has corrosion resistance against poor-quality gasoline including sulfur or organic acids, is excellent in wear resistance and conformability with a coupled shaft, so that the bearing can be suitably used even in a fuel pump reduced in size, and includes a novel Zn-P-Ni-Sn-C-Cu-based sintered alloy.SOLUTION: A bearing for a motor-type fuel pump has a structure where, by mass%, 3-13% of Zn, 0.1-0.9% of P, 10-21% of Ni, 3-12% of Sn, and 1-8% of C, with the remainder consisting of Cu and unavoidable impurities are contained, an Sn alloy phase containing, by mass%, 15% or more of Sn is formed on grain boundaries of a base comprising a solid solution phase of a Zn-Ni-Sn-Cu alloy, the porosity is 8-18%, and free graphite is distributed in the pores. |
