Sintered bearing for motor-type fuel pump and production method therefor
AssigneeDiamet Corporation
InventorsTsuneo Maruyama, Yoshinari Ishii
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Abstract
Provided is a bearing for a motor-type fuel injection pump. This bearing is composed of a Cu—Ni-based sintered alloy, inexpensive and has a superior corrosion resistance and abrasion resistance. The bearing contains 10 to 20% by mass of Ni, 2 to 4.5% by mass of Sn, 0.05 to 0.4% by mass of P, 2 to 7% by mass of C, and a remainder consisting of Cu and inevitable impurities. The bearing has a metal structure where Sn is uniformly dispersed and distributed in a metal matrix, and has a porosity of 7 to 17% where a free graphite is dispersed and distributed in pores.
Claims1
A sintered bearing for a fuel pump, consisting of:
- 10 to 20% by mass of Ni;
- 2 to 4.5% by mass of Sn;
- 0.05 to 0.4% by mass of P;
- 2 to 7% by mass of C;
- and
- a remainder consisting of Cu and inevitable impurities, wherein the sintered bearing has a metal structure where Sn in a form of a chemical element is uniformly dispersed and distributed in a metal matrix composed of Cu—Ni—Sn, and has a porosity of 7 to 17% where a free graphite is dispersed and distributed in pores.
Dependencies are inferred from the claim text.