Sintered bearing for motor-powered fuel injection pumps
AssigneeDiamet Corporation
InventorsYoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
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Abstract
There is provided a bearing for motor-powered fuel injection pumps, made from Cu—Ni-based sintered alloy, which is able to be obtained at a low cost, having excellent corrosion and abrasion resistances. The bearing contains 10 to 20% by mass of Ni, 5 to 13% by mass of Sn, 0.1 to 0.8% by mass of P, 1 to 6% by mass of C, and a remainder containing Cu and inevitable impurities, and is formed with a Ni—Sn—Cu—P phase containing at least 30% by mass of Sn in a grain boundary, and has a 8 to 18% porosity. The Ni—Sn—Cu—P phase contains 30 to 49% by mass of Ni, 10 to 30% by mass of Cu, 0.5 to 1.5% by mass of P, and a remainder containing Sn and inevitable impurities.
Claims6
A sintered bearing for motor-powered fuel injection pumps, comprising:
- 10 to 20% by mass of Ni;
- 5 to 13% by mass of Sn;
- 0.1 to 0.8% by mass of P;
- 1 to 6% by mass of C;
- and
- a remainder containing Cu and inevitable impurities, wherein
- a Ni—Sn—Cu—P phase containing at least 30% by mass of Sn is provided at a grain boundary,
- said bearing has a porosity of 8 to 18%, and
- the bearing is obtained by sintering at a temperature in a range of 840 to 940 degrees C.
Dependencies are inferred from the claim text.