JPH05231273A - Fuel injection nozzle and manufacture thereof - Google Patents
Fuel injection nozzle and manufacture thereofInfo
- Publication number
- JPH05231273A JPH05231273A JP6975992A JP6975992A JPH05231273A JP H05231273 A JPH05231273 A JP H05231273A JP 6975992 A JP6975992 A JP 6975992A JP 6975992 A JP6975992 A JP 6975992A JP H05231273 A JPH05231273 A JP H05231273A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- nozzle
- injection
- tube
- nozzle body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ディーゼルエンジン等
の内燃機関における燃料噴射ノズル及びその製造方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection nozzle in an internal combustion engine such as a diesel engine and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】内燃機関の燃料噴射ノズルは、ノズルボ
ディーの先端部に燃料を噴霧するための噴孔が設けられ
ている。この噴孔加工方法は、ドリルによって穿孔（荒
加工）し、次いでリーマによって仕上げ加工している。2. Description of the Related Art A fuel injection nozzle of an internal combustion engine is provided with an injection hole for spraying fuel at the tip of a nozzle body. In this injection hole machining method, a hole is drilled (rough machining) and then finished by a reamer.
【０００３】[0003]
【発明が解決しようとする課題】ところで、近時ＮＯｘ
の対策で燃料を微粒化噴射させるために高圧噴射（例え
ば２０００気圧）が要求されている。そのためには、燃
料噴射ノズルの噴孔の孔径を微細径にする必要がある。By the way, recently NOx
Therefore, high-pressure injection (for example, 2000 atm) is required to atomize and inject fuel. For that purpose, it is necessary to make the diameter of the injection hole of the fuel injection nozzle fine.
【０００４】しかしながら、上記従来の噴孔の加工方法
では、極細のドリルを使用しなければならないが、極細
のドリルでは加工中にドリルの折損が激しく、微細径の
穿孔が困難であり、高圧噴射に適した燃料噴射ノズルを
提供することができない問題がある。However, in the above-mentioned conventional method for processing an injection hole, an extremely fine drill has to be used. However, with an extremely fine drill, the breakage of the drill is severe during processing, and it is difficult to drill a fine diameter. There is a problem that a fuel injection nozzle suitable for the above cannot be provided.
【０００５】[0005]
【課題を解決するための手段】本発明は上記の問題を解
決した内燃機関のノズル及びその製造方法を提供するも
のであり、そのノズルの構成は、ノズルボディーの先端
部に穿設した穴に微小な絞り通路を内面に有するチュー
ブを嵌着して成る噴孔を備えたものである。SUMMARY OF THE INVENTION The present invention provides a nozzle for an internal combustion engine and a method for manufacturing the nozzle, which solves the above problems. The nozzle is constructed so that it has a hole formed at the tip of the nozzle body. It is provided with an injection hole formed by fitting a tube having a minute throttle passage on its inner surface.
【０００６】また、ノズルの製造方法は、ノズルボディ
ーの先端部に噴孔となる穴を機械加工する工程と、内面
に微小な絞り通路が形成されたチューブを前記穴に嵌着
する工程とから成るものである。Further, the method of manufacturing the nozzle comprises the steps of machining a hole to be a nozzle hole at the tip of the nozzle body, and fitting a tube having a minute throttle passage formed on the inner surface into the hole. It consists of
【０００７】[0007]
【作用】上記の構成により、ノズルボディーの先端部に
穿設される穴は加工容易な大径とし、この孔に嵌着され
るチューブによって高圧噴射に適した微小径の噴孔を備
えた燃料噴射ノズルの提供を可能とするものである。With the above structure, the hole formed at the tip of the nozzle body has a large diameter that can be easily machined, and the tube fitted into this hole has a small diameter injection hole suitable for high pressure injection. It is possible to provide an injection nozzle.
【０００８】[0008]
【実施例】以下本発明の実施例を図面に基づいて説明す
る。図１において、１はノズルボディー、２はニード
ル、３はノズルボディー１の先端部の噴孔である。この
噴孔３は、前記ノズルボディー１の先端部に穿設した穴
４に微小な絞り通路を内面に形成したチューブ５を嵌着
した構造である。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a nozzle body, 2 is a needle, and 3 is a nozzle hole at the tip of the nozzle body 1. The injection hole 3 has a structure in which a tube 5 having a minute throttle passage formed on the inner surface thereof is fitted into a hole 4 formed at the tip of the nozzle body 1.
【０００９】上記構造のノズルの製造方法について図２
により説明する。先ず図２（Ａ）で示すように、ノズル
ボディー１の先端部に噴孔３となる穴４をドリル６で穿
設し、次いで図２（Ｂ）で示すように前記穿設穴４をリ
ーマ７によって仕上げ加工する。このドリル６による荒
加工並びにリーマ７による仕上げ加工については従来と
同様であるが、加工される穴４の径は従来の噴孔径より
も大径である。FIG. 2 shows a method of manufacturing the nozzle having the above structure.
Will be explained. First, as shown in FIG. 2 (A), a hole 6 to be the injection hole 3 is bored at the tip of the nozzle body 1 with a drill 6, and then the bored hole 4 is reamed as shown in FIG. 2 (B). Finish by 7. The roughing with the drill 6 and the finishing with the reamer 7 are the same as the conventional ones, but the diameter of the hole 4 to be processed is larger than the diameter of the conventional injection hole.
【００１０】さらに、図２（Ｃ）で示すように、前記穿
設された大径の穴４に微小な絞り通路を内面に形成した
チューブ５を嵌着する。このチューブ５はステンレス、
合金鋼、セラミックス材等であり、穴４へのチューブ５
の嵌着は圧入、冷やし嵌め、又は圧入、冷やし嵌めとロ
ー付けの併用によるものである。Further, as shown in FIG. 2C, a tube 5 having a fine throttle passage formed on the inner surface thereof is fitted into the large-diameter hole 4 that has been bored. This tube 5 is stainless steel,
Alloy steel, ceramic material, etc., tube 5 into hole 4
The fitting is performed by press fitting, cold fitting, or by using both press fitting, cold fitting and brazing.
【００１１】また、チューブ５の内面に形成される微小
な絞り通路は、図３（Ａ）で示すようにオリフィス状５
ａ、図３（Ｂ）で示すようにラッパ状５ｂであり、その
周方向の断面は円、長円、四角形状とすることができ
る。この微小な絞り通路の形成は塑性加工等によって製
造が可能である。Further, the minute throttle passage formed on the inner surface of the tube 5 has an orifice shape 5 as shown in FIG. 3 (A).
3A, it has a trumpet shape 5b as shown in FIG. 3B, and its circumferential cross section can be circular, oval, or quadrangular. The minute throttle passage can be formed by plastic working or the like.
【００１２】上記本発明による燃料噴射ノズルでは、チ
ューブ５の内面のオリフィス状５ａ、ラッパ状５ｂの絞
り通路によって従来では求められなかった微小通路の噴
孔３となり、高圧噴射が得られる。In the fuel injection nozzle according to the present invention, the orifice 5a and the trumpet 5b on the inner surface of the tube 5 serve as injection holes 3 of a minute passage which have not been required in the past, and high pressure injection can be obtained.
【００１３】また、上記本発明の製造方法では、穴４は
大径であるため、ドリル６やリーマ７は大径をしようす
るので機械加工中にドリル６やリーマ７が折損すること
なく容易に加工することができる。また、この穴４に嵌
着されるチューブ５の内面のオリフィス状５ａ、ラッパ
状５ｂの絞り通路は塑性加工で成形されため、面荒さを
各段に仕上げることができ、高圧噴射性能が向上され
る。Further, in the above-described manufacturing method of the present invention, since the hole 4 has a large diameter, the drill 6 and the reamer 7 have a large diameter. It can be processed. Also, since the orifice-shaped 5a and trumpet-shaped 5b throttle passages on the inner surface of the tube 5 that are fitted in the holes 4 are formed by plastic working, the surface roughness can be finished in each step, and the high pressure injection performance is improved. It
【００１４】[0014]
【発明の効果】以上のように本発明によると、高圧噴射
に適した微小噴孔の燃料噴射ノズルが実現され、この微
小噴孔の形状も従来の機械加工では得られなかった形状
のものが容易に製造することができ高圧噴射性能の向上
を図ることができる。As described above, according to the present invention, a fuel injection nozzle having a fine injection hole suitable for high pressure injection is realized, and the fine injection hole has a shape that cannot be obtained by conventional machining. It can be easily manufactured and the high-pressure injection performance can be improved.
【図１】本発明の燃料噴射ノズルの要部断面図FIG. 1 is a sectional view of a main part of a fuel injection nozzle of the present invention.
【図２】本発明の製造方法を示す要部断面図FIG. 2 is a sectional view of an essential part showing a manufacturing method of the present invention.
【図３】本発明の噴孔の断面図FIG. 3 is a sectional view of the injection hole of the present invention.
１ ノズルボディー ２ ニードル ３ 噴孔 ４ 穴 ５ チューブ 1 Nozzle body 2 Needle 3 Injection hole 4 Hole 5 Tube
Claims (2)
微小な絞り通路を内面に有するチューブを嵌着して成る
噴孔を備えた燃料噴射ノズル。1. A fuel injection nozzle having an injection hole formed by fitting a tube having a minute throttle passage on its inner surface into a hole formed in the tip of a nozzle body.
を機械加工する工程と、内面に微小な絞り通路が形成さ
れたチューブを前記穴に嵌着する工程とから成る燃料噴
射ノズルの製造方法。2. A manufacturing method of a fuel injection nozzle, which comprises a step of machining a hole to be an injection hole at a tip end portion of a nozzle body, and a step of fitting a tube having a minute throttle passage formed on an inner surface thereof into the hole. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6975992A JPH05231273A (en) | 1992-02-19 | 1992-02-19 | Fuel injection nozzle and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6975992A JPH05231273A (en) | 1992-02-19 | 1992-02-19 | Fuel injection nozzle and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05231273A true JPH05231273A (en) | 1993-09-07 |
Family
ID=13412055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6975992A Pending JPH05231273A (en) | 1992-02-19 | 1992-02-19 | Fuel injection nozzle and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05231273A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000023707A1 (en) * | 1998-10-15 | 2000-04-27 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines with self-ignition |
| WO2002063161A1 (en) * | 2001-02-08 | 2002-08-15 | Siemens Aktiengesellschaft | Fuel injection nozzle for an internal combustion engine |
| WO2005064150A1 (en) * | 2003-12-29 | 2005-07-14 | Robert Bosch Gmbh | Fuel injection valve |
| CH705454A1 (en) * | 2011-08-31 | 2013-03-15 | Efi Hightech Ag | Injector, particularly orifice nozzle for ignition combustion engine, has body, in which nozzle needle is displaceably guided and pressure chamber which communicates with inlet bore and over passage with injection chamber |
-
1992
- 1992-02-19 JP JP6975992A patent/JPH05231273A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000023707A1 (en) * | 1998-10-15 | 2000-04-27 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines with self-ignition |
| WO2002063161A1 (en) * | 2001-02-08 | 2002-08-15 | Siemens Aktiengesellschaft | Fuel injection nozzle for an internal combustion engine |
| WO2005064150A1 (en) * | 2003-12-29 | 2005-07-14 | Robert Bosch Gmbh | Fuel injection valve |
| CH705454A1 (en) * | 2011-08-31 | 2013-03-15 | Efi Hightech Ag | Injector, particularly orifice nozzle for ignition combustion engine, has body, in which nozzle needle is displaceably guided and pressure chamber which communicates with inlet bore and over passage with injection chamber |
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