# US 11,441,608 B2 · Sintered bearing for motor-type fuel pump and production method therefor

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- Number: US 11,441,608 B2
- Document ID: US11441608B2
- Status: Granted
- Kind: B2
- Application number: 16/492,520
- Filed: 2018-06-28
- Published: 2021-05-06
- Granted: 2022-09-13
- Earliest claimed: 2017-06-29
- Assignees: Diamet Corporation
- Applicants: Diamet Corporation
- Inventors: Tsuneo Maruyama; Yoshinari Ishii
- Web page: https://patentgrep.com/patent/US11441608B2

## CPC

- F16C 33/12: Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- B22F 3/11: Making porous workpieces or articles
- B22F 5/106: {Tube or ring forms}
- C22C 9/06: with nickel or cobalt as the next major constituent
- C22C 32/0084: {carbon or graphite as the main non-metallic constituent}
- F16C 17/02: for radial load only
- F16C 33/1095: {with solids as lubricant, e.g. dry coatings, powder}
- F16C 33/128: {Porous bearings, e.g. bushes of sintered alloy}
- F16C 33/145: {of sintered porous bearings}
- B22F 2301/10: Copper
- B22F 2998/10: Processes characterised by the sequence of their steps
- F16C 2202/10: Porosity
- F16C 2202/52: Graphite
- F16C 2204/10: Alloys based on copper
- F16C 2220/08: by compression-moulding
- F16C 2220/20: by sintering pulverised material, e.g. powder metallurgy
- F16C 2360/22: Internal combustion engines
- F16C 2360/44: Centrifugal pumps
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## 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.

## Claims

### Claim 1

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.