JPS6394074A - Injection nozzle structure - Google Patents
Injection nozzle structureInfo
- Publication number
- JPS6394074A JPS6394074A JP23920586A JP23920586A JPS6394074A JP S6394074 A JPS6394074 A JP S6394074A JP 23920586 A JP23920586 A JP 23920586A JP 23920586 A JP23920586 A JP 23920586A JP S6394074 A JPS6394074 A JP S6394074A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- tip
- needle valve
- metal member
- injection nozzle
- 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.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 title claims abstract description 27
- 239000000919 ceramic Substances 0.000 claims abstract description 15
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 24
- 238000003466 welding Methods 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 3
- 238000005219 brazing Methods 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は内燃機関へ燃料を霧化して供給する噴射ノズル
に係り、特に、ノズル本体を金属にて形成すると共にノ
ズル先端部をセラミックスで形成し、これらを一体に接
続した噴射ノズル構造に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an injection nozzle that atomizes and supplies fuel to an internal combustion engine, and particularly relates to an injection nozzle in which the nozzle body is made of metal and the nozzle tip is made of ceramics. The present invention also relates to an injection nozzle structure in which these are integrally connected.
［従来の技術］
内燃機関に採用される噴射ノズルは、ノズル先端部が燃
焼室に臨まされて配設されるために燃焼ガスに対しての
？：Ｓ温強度が要求される。このため本出誼人は特開昭
５８−１４３１Ｇ３号公報にノズルボディの先端部分で
ある噴口部を３ｉ３Ｎ４またはＡＪ！２０ｘ等のセラミ
ックスで形成したエンジン用燃料噴射ノズルを提案して
いる。[Prior Art] Injection nozzles used in internal combustion engines are arranged so that the tip of the nozzle faces the combustion chamber, so it is difficult to inject combustion gas into the injection nozzle. :S temperature strength is required. For this reason, the author of the present publication published Japanese Patent Application Laid-Open No. 58-1431G3 with the nozzle part, which is the tip of the nozzle body, as 3i3N4 or AJ! We are proposing an engine fuel injection nozzle made of ceramics such as 20x.
［発明が解決しようとする問題点］
」−記ノズル先端部を形成するビラミックスは一般の金
属材料に比べて■熱膨張係数が小さい、■大きな耐衝撃
性をもつ、■熱伝導度が小さいなどの優れた長所をもっ
ているが、しかし、金属性のノズル本体にセラミックス
製のノズル先端を接続する上で、構造が複雑になって製
造コストが上昇するため改善の余地が残されていた。[Problems to be solved by the invention] Compared to general metal materials, Viramix, which forms the tip of the nozzle, ■has a small coefficient of thermal expansion, ■has high impact resistance, and ■has low thermal conductivity. However, there is still room for improvement because the structure becomes complicated and manufacturing costs increase when connecting the ceramic nozzle tip to the metal nozzle body.
［問題点を解決するための手段］
本発明は上記問題点を解決することを目的とし、本発明
は、針弁を昇降自在に収容するノズル本体の先端に外周
部で接続されて低熱膨張係数を有するリング状の中間部
材をインロー嵌合し、この中間部材の他端にセラミック
スから成り噴口を備えたノズル先端部を一体に接続して
噴射ノズルＭＰＩ造を構成するものである。[Means for Solving the Problems] The present invention aims to solve the above-mentioned problems, and the present invention provides a needle valve that is connected at its outer peripheral portion to the tip of a nozzle body that accommodates the needle valve so as to be able to move up and down. An MPI injection nozzle is constructed by fitting a ring-shaped intermediate member with a spigot, and integrally connecting a nozzle tip made of ceramics and equipped with a spout to the other end of the intermediate member.
［作 用〕
ノズル本体、低熱膨張係数をもつ中間金属部材、セラミ
ックス製のノズル先端部を接続することによって構造簡
易なノズルボディが形成される。また針弁がノズル本体
のシート部に着座された時には針弁先端部の外周面とノ
ズル先端部の内周面との間に僅かなクリアランスが形成
される。このため、針弁の着座時に生じる衝撃力がセラ
ミックス製のノズル先端部及び中間金属部材との接続部
に負荷されなくなり、これらの耐久力を大幅に向上でき
る。さらに、上記クリアランスは噴口へ燃料を圧送する
通路となるため燃料が速やかに噴口から噴射されて、噴
口づまりをなくずことができる。[Function] A nozzle body with a simple structure is formed by connecting the nozzle body, an intermediate metal member with a low coefficient of thermal expansion, and a ceramic nozzle tip. Further, when the needle valve is seated on the seat portion of the nozzle body, a slight clearance is formed between the outer circumferential surface of the needle valve tip and the inner circumferential surface of the nozzle tip. Therefore, the impact force generated when the needle valve is seated is no longer applied to the ceramic nozzle tip and the connection portion with the intermediate metal member, and the durability thereof can be greatly improved. Furthermore, since the above-mentioned clearance serves as a path for forcefully feeding fuel to the nozzle, fuel can be quickly injected from the nozzle, thereby eliminating nozzle clogging.
［実施例］
以下に本発明の噴射ノズル構造の好適一実施例を添付図
面に基づいて説明する。[Embodiment] A preferred embodiment of the injection nozzle structure of the present invention will be described below with reference to the accompanying drawings.
第１図に示されるように円筒状に形成されたノズル本体
１の４弁収容部２には、針弁３が昇降自在に収容されて
おり、このノズル本体１の先端にはインコロイ又はコバ
ール等の低熱膨張係数を有する金属材ＣＩから構成され
たＮｉ−Ｃｒ系特殊合金の中間金属部材４が１り続され
る。ノズル本体１には、先端内周面に上記針弁３のシー
ト面３ａが着座されるシート部５が錐体状に形成される
と共に、このシート部５を包囲する部分のノズル本体１
の外周面は筒状に縮径されて段部６として形成されてい
る。As shown in FIG. 1, a needle valve 3 is housed in a four-valve accommodating portion 2 of a cylindrical nozzle body 1 so as to be able to rise and fall freely. An intermediate metal member 4 made of a special Ni-Cr alloy made of a metal material CI having a low coefficient of thermal expansion of 1 is connected. The nozzle body 1 has a conical seat portion 5 on the inner circumferential surface of which the seat surface 3a of the needle valve 3 is seated, and a portion of the nozzle body 1 surrounding the seat portion 5.
The outer circumferential surface of is reduced in diameter into a cylindrical shape and is formed as a stepped portion 6.
一方、中間金属部材４はリング状に形成されると共に一
端側に上記段部Ｇにインロー嵌合される筒部１０が形成
されている。これら段部６と筒部１０とは■今後、ノズ
ル本体１側の接続部１２をビーム溶接することによって
一体的に接続される。On the other hand, the intermediate metal member 4 is formed into a ring shape, and has a cylindrical portion 10 fitted to the stepped portion G with a spigot at one end thereof. The stepped portion 6 and the cylindrical portion 10 will be integrally connected by beam welding the connecting portion 12 on the nozzle body 1 side.
他方、ノズル先端部７はセラミックス（例えば３ｉ ｓ
Ｎａ ）にて焼成され、この実施例では、針弁３の先
端部の外周部の形状に倣わせて断面Ｖ字形に形成される
。また、上記シート部５に針弁２のシート部３ａが着座
されたときにおいて、ノズル先端部７の内周面７ａと針
弁２の先端部の外周面との間には僅かなクリアランス（
を保つように設定される。このクリアランスｔは燃料だ
まりをなくして燃料の切れを良クシ、ひいては噴口８の
カーボンづまりを防止する通路１５をも形成するもので
あり、また各噴口８から燃料が均等に噴射されるように
したものである。さらに、シート部３ａの表面には、溶
射等によってセラミックス硬化層９が形成されており、
この硬化層９がシート部３ａの耐摩耗性を大幅に向上さ
せることができる。ノズル先端部７の側部７ａにはその
傾斜方向に対し交差する方向に燃料の噴口８が形成され
ている。さらに、ノズル先端部７の端面１１と上記中間
金属部材４の他端面４Ｇは共に軸方向に対して垂直に形
成されており、これら端面１１，４ａ同士はノズル本体
１の軸芯上に重ねられて拡散溶接、またはブレージング
溶接により一体に接続される。ここで上記接続部１２を
溶接するようにしたのは、ノズル先端部７と中間金属部
材４との溶接時の熱がノズル本体１と中間金属部材４と
の接続部に影響することを避けるためであり、接続部の
熱処理を不用にするためである。このようにしてノズル
本体１、中間金属部材４そしてノズル先端部７が同軸上
に一体接続されたノズルボディ１２を得ることができる
。On the other hand, the nozzle tip 7 is made of ceramics (for example, 3is
In this embodiment, it is formed into a V-shaped cross section to follow the shape of the outer circumference of the tip of the needle valve 3. Furthermore, when the seat portion 3a of the needle valve 2 is seated on the seat portion 5, there is a slight clearance (
is set to maintain This clearance t eliminates fuel pools, improves fuel depletion, and also forms a passage 15 that prevents the nozzle ports 8 from clogging with carbon, and also ensures that fuel is evenly injected from each nozzle port 8. It is. Furthermore, a hardened ceramic layer 9 is formed on the surface of the sheet portion 3a by thermal spraying or the like.
This hardened layer 9 can significantly improve the wear resistance of the sheet portion 3a. A fuel nozzle 8 is formed in the side 7a of the nozzle tip 7 in a direction that intersects with the direction of inclination thereof. Furthermore, the end surface 11 of the nozzle tip 7 and the other end surface 4G of the intermediate metal member 4 are both formed perpendicular to the axial direction, and these end surfaces 11 and 4a are overlapped on the axis of the nozzle body 1. They are connected together by diffusion welding or brazing welding. The reason for welding the connecting portion 12 here is to prevent the heat during welding between the nozzle tip 7 and the intermediate metal member 4 from affecting the connecting portion between the nozzle body 1 and the intermediate metal member 4. This is to eliminate the need for heat treatment of the connection portion. In this way, it is possible to obtain a nozzle body 12 in which the nozzle main body 1, the intermediate metal member 4, and the nozzle tip 7 are integrally connected coaxially.
ここで、上記ノズル先端部７に形成する噴口８はセラミ
ックス焼成と同時に形成できるので、その噴口形状を異
形形状とすることや、噴口方向、噴口直径なども精度よ
く形成することが可能になる。尚本実施例の説明で、シ
ート部３ａ及びそのシート部３ａに被覆形成されるヒラ
ミック硬化層９を中間金属部材４に形成する説明をした
が、中間金属部材４をノズル本体部゛１とノズル先端部
４とを接続するために軸方向の長さを良くし、シート部
３ａ及び上記硬化層９を中間金属部材に形成してもよい
、
［発明の効果］
以上説明したことから明らかなように本発明の噴射ノズ
ル構造によれば次のごとき優れた効果を発揮できる。Here, since the nozzle 8 formed in the nozzle tip 7 can be formed at the same time as ceramic firing, it is possible to form the nozzle into an irregular shape, and to form the nozzle direction, the nozzle diameter, etc. with high accuracy. In the description of this embodiment, the sheet portion 3a and the Hiramic hardened layer 9 coated on the sheet portion 3a are formed on the intermediate metal member 4, but the intermediate metal member 4 is connected to the nozzle body portion 1 The sheet portion 3a and the hardened layer 9 may be formed as an intermediate metal member by increasing the length in the axial direction to connect the tip portion 4. [Effects of the Invention] As is clear from the above explanation. According to the injection nozzle structure of the present invention, the following excellent effects can be exhibited.
（１） 針弁を昇降自在に収容するノズル本体の先端
に外周部で接続されて低熱膨張係数を有するリング状の
中間部材をインロー嵌合し、その中間部材の他端にセラ
ミックスから成り噴口を備えたノズル先端部を一体に接
続し、上記金属部材を低熱膨張係数を有する材料で形成
し且つノズル先端部内周面と針弁先端部外周面との間に
針弁着座時に於ける僅かなクリアランスをもたせたので
針弁の着座時に生じる衝撃力がセラミック製のノズル先
端部およびノズル先端部と中間金属部材との接続部に加
えられなくなり耐久性を大幅に向上できる。(1) A ring-shaped intermediate member having a low coefficient of thermal expansion is connected at the outer periphery to the tip of the nozzle body that accommodates the needle valve so that it can be raised and lowered, and the other end of the intermediate member is made of ceramic and has a nozzle. The metal member is made of a material with a low coefficient of thermal expansion, and there is a slight clearance between the inner circumferential surface of the nozzle tip and the outer circumferential surface of the needle valve tip when the needle valve is seated. Because of this, the impact force generated when the needle valve is seated is not applied to the ceramic nozzle tip and the connection between the nozzle tip and the intermediate metal member, thereby significantly improving durability.
（２） ノズル先端部に、噴口へ燃料を案内する通路
を形成できるクリアランスを形成したので、ノズル本体
に接続したノズル先端部の噴口へ燃料を速やかに且つ均
等に導くことができ、燃料切れを良くして噴口のカーボ
ンづまりを防止することができる。(2) A clearance has been formed at the nozzle tip to form a passage that guides the fuel to the nozzle, so fuel can be quickly and evenly guided to the nozzle at the nozzle tip connected to the nozzle body, preventing fuel from running out. By doing so, carbon clogging of the nozzle can be prevented.
【図面の簡単な説明】
第１図は本発明の噴射ノズル構造の好適一実施例を示す
縦断面図である。
図中、１はノズル本体、３は針弁、４は中間金属部材、
５はシート部、６は段部、７はノズル先端部、８は噴口
、１０は筒部である。
特許出願人 いすず自動車株式会社
代理人弁理士 絹 谷 信 雄
第１図BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a preferred embodiment of the injection nozzle structure of the present invention. In the figure, 1 is the nozzle body, 3 is the needle valve, 4 is the intermediate metal member,
5 is a seat portion, 6 is a step portion, 7 is a nozzle tip, 8 is a spout, and 10 is a cylinder portion. Patent applicant Nobuo Kinutani, patent attorney representing Isuzu Motors Co., Ltd. Figure 1
Claims (9)
外周部で接続されて低熱膨張係数を有するリング状の中
間金属部材をインロー嵌合し、その中間金属部材の他端
にセラミックスから成り噴口を備えたノズル先端部を一
体に接続したことを特徴とする噴射ノズル構造。(1) A ring-shaped intermediate metal member having a low coefficient of thermal expansion is connected at the outer periphery to the tip of the nozzle body that accommodates the needle valve so that it can be raised and lowered, and a ring-shaped intermediate metal member having a low coefficient of thermal expansion is fitted with a spigot, and the other end of the intermediate metal member is made of ceramics. An injection nozzle structure characterized by a nozzle tip equipped with an injection port that is integrally connected.
れると共に、上記中間金属部材が上記針弁の着座される
シート部を有し、その針弁が着座されたときに、ノズル
先端部内周面と針弁先端部外周面との間に僅かなクリア
ランスを有するように形成された上記特許請求の範囲第
１項記載の噴射ノズル構造。(2) The nozzle tip is formed to follow the needle valve tip, and the intermediate metal member has a seat on which the needle valve is seated, and when the needle valve is seated, the nozzle tip The injection nozzle structure according to claim 1, wherein the injection nozzle structure is formed so as to have a slight clearance between the inner circumferential surface of the part and the outer circumferential surface of the tip of the needle valve.
れると共に、上記ノズル本体が上記針弁の着座されるシ
ート部を有し、その針弁が着座されたときに、ノズル先
端部内周面と針弁先端部外周面との間に僅かなクリアラ
ンスを有するように形成された上記特許請求の範囲第１
項記載の噴射ノズル構造。(3) The tip of the nozzle is formed to follow the tip of the needle valve, and the nozzle body has a seat on which the needle valve is seated, and when the needle valve is seated, the inside of the tip of the nozzle is The first aspect of the present invention is formed to have a slight clearance between the circumferential surface and the outer circumferential surface of the tip of the needle valve.
Injection nozzle structure described in section.
案内するように形成された上記特許請求の範囲第２項ま
たは３項記載の噴射ノズル構造。(4) The injection nozzle structure according to claim 2 or 3, wherein the clearance is formed so as to uniformly guide the fuel to the injection port.
ラミックス硬化層を被覆形成された上記特許請求の範囲
第２項または３項記載の噴射ノズル構造。(5) The injection nozzle structure according to claim 2 or 3, wherein the seat portion on which the needle valve is seated has a hardened ceramic layer coated on its surface.
料から構成された上記特許請求の範囲第１項記載の噴射
ノズル構造。(6) The injection nozzle structure according to claim 1, wherein the intermediate metal member is made of a metal material having a low coefficient of thermal expansion.
溶接により接合された上記特許請求の範囲第１項記載の
噴射ノズル構造。(7) The injection nozzle structure according to claim 1, wherein the intermediate metal member and the nozzle body are joined by beam welding.
ージング溶接により接合された上記特許請求の範囲第１
項記載の噴射ノズル。(8) Claim 1, wherein the intermediate metal member and the nozzle tip are joined by brazing welding.
Injection nozzle as described in section.
接により接合された上記特許請求の範囲第１項記載の噴
射ノズル。(9) The injection nozzle according to claim 1, wherein the intermediate metal member and the nozzle tip are joined by diffusion welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23920586A JPH0612107B2 (en) | 1986-10-09 | 1986-10-09 | Injection nozzle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23920586A JPH0612107B2 (en) | 1986-10-09 | 1986-10-09 | Injection nozzle structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6394074A true JPS6394074A (en) | 1988-04-25 |
| JPH0612107B2 JPH0612107B2 (en) | 1994-02-16 |
Family
ID=17041296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23920586A Expired - Lifetime JPH0612107B2 (en) | 1986-10-09 | 1986-10-09 | Injection nozzle structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0612107B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020062615A (en) * | 2018-10-18 | 2020-04-23 | 日産自動車株式会社 | Nozzle for cold spray, and cold spray device |
-
1986
- 1986-10-09 JP JP23920586A patent/JPH0612107B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020062615A (en) * | 2018-10-18 | 2020-04-23 | 日産自動車株式会社 | Nozzle for cold spray, and cold spray device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0612107B2 (en) | 1994-02-16 |
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