# US 7,607,418 B2 · Fuel injection nozzle and method of holding the same

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- Number: US 7,607,418 B2
- Document ID: US7607418B2
- Status: Granted
- Kind: B2
- Application number: 12/193,433
- Filed: 2008-08-18
- Published: 2009-03-12
- Granted: 2009-10-27
- Earliest claimed: 2008-08-18
- Assignees: Hitachi, Ltd.
- Inventors: Motoyuki Abe; Masahiko Hayatani; Tohru Ishikawa; Takehiko Kowatari; Noriyuki Maekawa; Yasuo Namaizawa; Yusuke Irino
- Web page: https://patentgrep.com/patent/US7607418B2

## CPC

- F02M 55/004: {Joints; Sealings}
- F02M 55/005: {for high pressure conduits, e.g. connected to pump outlet or to injector inlet}
- F02M 55/02: Conduits between injection pumps and injectors {, e.g. conduits between pump and common-rail or conduits between common-rail and injectors}
- F02M 61/166: {Selection of particular materials}
- F02M 2200/16: Sealing of fuel injection apparatus not otherwise provided for
- F02M 2200/8023: the assembly involving use of quick-acting mechanisms, e.g. clips
- F02M 2200/90: Selection of particular materials
- F02M 2200/9053: Metals
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A fuel injection nozzle for directly injecting fuel into a cylinder of an internal combustion engine is inserted in a connecting pipe extending from a fuel rail and is fixed to the connecting pipe by fastening member. The fuel injection nozzle has a sealing part for sealing a fuel passage to prevent fuel leakage, and a contact part in contact with the fastening member. The contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.

## Claims

### Claim 1

A fuel injection nozzle for injecting fuel directly into a cylinder of an internal combustion engine, inserted in a fuel rail and fastened to the fuel rail with a fastening member, said fuel injection nozzle having:
a sealing part for sealing a fuel passage to prevent fuel leakage; and
a contact part in contact with the fastening member;
wherein the contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.

### Claim 2 (depends on 1)

The fuel injection nozzle according to claim 1 wherein the contact part is formed of a material having a tensile strength lower than that of the fastening member or a material having a hardness lower than that of the fastening member.

### Claim 3 (depends on 1)

The fuel injection nozzle according to claim 1, wherein the contact part is a protrusion capable of coming into contact with the fastening member.

### Claim 4 (depends on 1)

The fuel injection nozzle according to claim 1, wherein the contact part is a U-shaped member made of a material having a yield point lower than those of the fastening member and a fixing part of the fuel injection nozzle fixed by the fastening member, and held between the fastening member and the fixing part.

### Claim 5

A fuel injection nozzle holding method of holding a fuel injection nozzle for injecting fuel directly into a cylinder of an internal combustion engine, comprising the steps of:
inserting a base end part of the fuel injection nozzle in a fuel rail; and
fastening the fuel injection nozzle to the fuel rail with a fastening member;
wherein the fuel injection nozzle has a sealing part for sealing a fuel passage to prevent fuel leakage, and a contact part in contact with the fastening member, the contact part is formed in a member softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.

### Claim 6 (depends on 5)

The fuel injection nozzle holding method according to claim 5, wherein the fastening member includes a fixing clip, and a holding plate held between the fixing clip and the fuel injection nozzle.