JPH0660609B2 - Fuel injection nozzle body of diesel engine - Google Patents
Fuel injection nozzle body of diesel engineInfo
- Publication number
- JPH0660609B2 JPH0660609B2 JP61051100A JP5110086A JPH0660609B2 JP H0660609 B2 JPH0660609 B2 JP H0660609B2 JP 61051100 A JP61051100 A JP 61051100A JP 5110086 A JP5110086 A JP 5110086A JP H0660609 B2 JPH0660609 B2 JP H0660609B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle body
- fuel injection
- nozzle
- injection nozzle
- diesel engine
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】 （イ）発明の目的 ［産業上の利用分野］ この発明はディーゼル機関の燃料噴射ノズルボディーに
関するものである。DETAILED DESCRIPTION OF THE INVENTION (A) Object of the Invention [Industrial field of application] The present invention relates to a fuel injection nozzle body of a diesel engine.
ディーゼル機関においては、燃料室内に燃料噴霧を形成
するために、燃料噴射系の末端において噴射ノズルを使
用する。In diesel engines, injection nozzles are used at the end of the fuel injection system to create a fuel spray in the fuel chamber.
噴射ノズルはノズルボディーの中孔内に針弁が挿入さ
れ、この針弁が軸方向に変位することによって、ノズル
ボディーの先端に形成された噴口が開閉する。針弁はノ
ズルばねで弁座に押付けられ、燃料油圧が規定圧力に達
するまで開弁しない。ノズルボディーはノズルホルダー
にノック等によって位置決めされて機関に取り付けられ
る。In the injection nozzle, a needle valve is inserted into the bore of the nozzle body, and the needle valve is displaced in the axial direction to open and close the injection port formed at the tip of the nozzle body. The needle valve is pressed against the valve seat by the nozzle spring and does not open until the fuel oil pressure reaches the specified pressure. The nozzle body is positioned on the nozzle holder by a knock or the like and attached to the engine.
［従来の技術］ このような燃料噴射ノズルは、従来、金属で作られてお
り、実用的に十分な性能をもっているが、ディーゼル機
関の断熱化が進むにつれて、燃料室周辺に更に高温に曝
されることになると、この高熱負荷によって、焼き付
き、摩耗、浸食により性能が維持できない事態が発生す
ることが心配される。[Prior Art] Such a fuel injection nozzle has been conventionally made of metal and has sufficient performance in practice, but as the heat insulation of the diesel engine progresses, the fuel injection nozzle is exposed to higher temperatures around the fuel chamber. In this case, it is feared that this high heat load may cause a situation in which the performance cannot be maintained due to seizure, wear, and erosion.
このようなことから、近来、燃料噴射ノズルをセラミッ
ク材料で作ることが考えられている。セラミック材料は
軽量で機械的強度が高く、耐熱性や耐摩耗性に富み、電
気絶縁性がよく、耐食性や耐薬品性に優れているなど、
金属では達成できない特性を持っているところから、燃
料噴射ノズルの構成材料として有望である。Therefore, it has recently been considered that the fuel injection nozzle is made of a ceramic material. Ceramic materials are lightweight, have high mechanical strength, are rich in heat resistance and wear resistance, have good electrical insulation, and have excellent corrosion resistance and chemical resistance.
Since it has properties that cannot be achieved with metals, it is a promising material for fuel injection nozzles.
しかるに内燃機関等に適応されるセラミック材料は、酸
化物系や非酸化物系に分類され、アルミナ（Ａ
２Ｏ３）、ジルコニア（ＺｒＯ２）、窒化けい素（Ｓｉ
３Ｎ４）、炭化けい素（ＳｉＣ）等が注目されている
が、セラミック材料は本質的な特性として脆性である。However, ceramic materials applicable to internal combustion engines and the like are classified into oxide type and non-oxide type, and alumina (A
2 O 3 ), zirconia (ZrO 2 ), silicon nitride (Si
3 N 4 ), silicon carbide (SiC), and the like have attracted attention, but the ceramic material is brittle as an essential property.
セラミック性の従来の燃料噴射ノズルのボディーは第４
図に示すように、噴口１０１のある先端側の小径部１０
２と基端側の大径部１０３とを肩部１０４を境にして備
えている。肩部１０４はノズルボディーの中心方向にθ
＝１８０°をなし円環状の平面をなしている。The conventional ceramic fuel injection nozzle has a fourth body
As shown in the figure, the small-diameter portion 10 on the tip side having the nozzle 101 is provided.
2 and a large-diameter portion 103 on the base end side with the shoulder portion 104 as a boundary. The shoulder 104 is θ toward the center of the nozzle body.
= 180 ° and an annular plane.
［発明が解決しようとする問題点］ このような従来の燃料噴射ノズルボディーをノズルホル
ダー１０５に取り付けた場合に、燃料噴射ノズルは、そ
の機能上、毎分２０００回におよぶ針弁１０６の開閉に
より、高圧の燃料を噴出するので、閉弁時の針弁１０６
の着座における衝撃により、小径部１０２と肩部１０４
との接続部の鋭角部Ａに応力集中を受けて疲労破壊によ
り破壊してしまい、これがセラミック材料製の燃料噴射
ノズルの実用化を妨げる一因となっている。[Problems to be Solved by the Invention] When such a conventional fuel injection nozzle body is attached to the nozzle holder 105, the function of the fuel injection nozzle is to open and close the needle valve 106 up to 2000 times per minute. , High-pressure fuel is ejected, so that the needle valve 106 when the valve is closed
Due to the impact of sitting on the
Stress is concentrated on the acute-angled portion A of the connection portion with and is destroyed by fatigue fracture, which is one of the factors that hinder the practical application of the fuel injection nozzle made of a ceramic material.
この発明は上記の如き事情に鑑みてなされたものであっ
て、ノズルホルダーを介して機関に取付けて使用した場
合に、針弁が弁座に着座する場合の衝撃によって応力集
中が生じることがなく、従って、疲労破壊が生ずること
なく、耐久性の高い、セラミック製燃料噴射ノズルボデ
ィーを提供することを目的とするものである。The present invention has been made in view of the above circumstances, and when used by being attached to an engine through a nozzle holder, stress concentration does not occur due to impact when the needle valve is seated on the valve seat. Therefore, it is an object of the present invention to provide a ceramic fuel injection nozzle body having high durability without causing fatigue fracture.
（ロ）発明の構成 ［問題を解決するための手段］ この目的に対応して、この発明のディーゼル機関の燃料
噴射ノズルボディーは、噴口のある先端側の小径部と基
端側の大径部とを肩部を境にして備えるセラミック製の
燃料噴射ノズルボディーであって、前記肩部の少なくと
も一部分が頂角が１２０°〜６０°をなすテーパー面を
なすことを特徴としている。(B) Configuration of the Invention [Means for Solving the Problem] To this end, the fuel injection nozzle body of the diesel engine of the present invention has a small-diameter portion on the front end side and a large-diameter portion on the base end side having an injection port. The fuel injection nozzle body is made of ceramic and has a shoulder portion as a boundary, and at least a part of the shoulder portion is a tapered surface having an apex angle of 120 ° to 60 °.
以下、この発明の詳細を一実施例を示す図面について説
明する。Hereinafter, details of the present invention will be described with reference to the drawings illustrating an embodiment.
第１図及び第２図において、１は燃料噴射ノズルのノズ
ルボディーである。ノズルボディー１は噴口２のある先
端側に小径部３を有し、かつ、基端側に大径部４を有す
る。小径部３と大径部４とは肩部５を境として連続して
いる。1 and 2, reference numeral 1 denotes a nozzle body of the fuel injection nozzle. The nozzle body 1 has a small diameter portion 3 on the tip side where the nozzle 2 is located and has a large diameter portion 4 on the base end side. The small diameter portion 3 and the large diameter portion 4 are continuous with the shoulder portion 5 as a boundary.
ノズルボディー１の内部には中心方向に弁孔６が形成さ
れている。弁孔６の先端部は先細状となって弁座７を形
成する。弁孔６は針弁１０６を収納するためのものであ
る。弁座７の先端は噴口２に連続する。A valve hole 6 is formed in the nozzle body 1 in the central direction. The tip of the valve hole 6 is tapered to form a valve seat 7. The valve hole 6 is for accommodating the needle valve 106. The tip of the valve seat 7 is continuous with the injection port 2.
ノズルボディー１は、窒化けい素（Ｓｉ３Ｎ４）、ジル
コニア（ＺｒＯ２）、炭化けい素（ＳｉＣ）アルミナ
（Ａ２Ｏ３）等を使用し、これらの材料を常圧焼結
法、ホットプレス法、ホットアイソスタティクプレス法
（ＨＩＰ）等によって形成したものである。The nozzle body 1 is made of silicon nitride (Si 3 N 4 ), zirconia (ZrO 2 ), silicon carbide (SiC) alumina (A 2 O 3 ), or the like. It is formed by a pressing method, a hot isostatic pressing method (HIP) or the like.
肩部５はノズルボディー１の中心方向に対して傾斜（θ
≠１８０°）しており、好ましくは頂角はθ＝１２０°
〜６０°の範囲で選択する。The shoulder portion 5 is inclined with respect to the center direction of the nozzle body 1 (θ
≠ 180 °), and preferably the apex angle is θ = 120 °
Select in the range of -60 °.
［作用］ このように構成されたノズルボディー１を使用する場合
は、ノズルボディー１はノズルホルダー８に位置決めし
て機関に取り付ける。ノズルボディー１は肩部５でノズ
ルホルダー８に当接する。この場合に、ノズルホルダー
８のノズルボディー１との当接面１１をテーパー状に形
成するか、若しくはノズルホルダー８内にガスケットを
配設して、ノズルボディー１の肩部５を受けるようにす
ることが望ましい。[Operation] When the nozzle body 1 configured as described above is used, the nozzle body 1 is positioned on the nozzle holder 8 and attached to the engine. The nozzle body 1 contacts the nozzle holder 8 at the shoulder 5. In this case, the contact surface 11 of the nozzle holder 8 with the nozzle body 1 is formed in a tapered shape, or a gasket is provided in the nozzle holder 8 so as to receive the shoulder portion 5 of the nozzle body 1. Is desirable.
針弁の開閉の際に、針弁１０６が弁座７に着座して衝撃
を生じるが、ノズルボディー１の肩部５はテーパー面に
なっていて表面積が大きく、従って、ノズルホルダー８
との接触面積も大きく、針弁の着座による衝撃を大きな
接触面積で受け、衝撃を分散させ、応力集中を回避す
る。When the needle valve is opened and closed, the needle valve 106 is seated on the valve seat 7 to generate an impact, but the shoulder portion 5 of the nozzle body 1 is a tapered surface and has a large surface area.
It also has a large contact area with the needle valve and receives the impact due to the seating of the needle valve with a large contact area to disperse the impact and avoid stress concentration.
（ハ）発明の効果 このように、この発明のノズルボディーではノズルホル
ダーとの接触部であるノズルボディーの肩部をテーパー
状にし、応力集中を分散回避する結果、ノズルボディー
の肩部が補強されることとなり、セラミック燃料噴射ノ
ズルの耐久性を向上させることができる。(C) Effect of the Invention As described above, in the nozzle body of the present invention, the shoulder portion of the nozzle body, which is the contact portion with the nozzle holder, is tapered to avoid the stress concentration from being dispersed. As a result, the shoulder portion of the nozzle body is reinforced. As a result, the durability of the ceramic fuel injection nozzle can be improved.
［実施例］ 下記の３種のノズルボディーを試料として作製し、耐久
性のテストを行った。[Example] The following three types of nozzle bodies were prepared as samples and tested for durability.
試験結果を第３図に示す。第３図におけるNo.１は本発
明のノズルボディーであり、No.２，No.３は従来のノズ
ルボディーであり、No.２のものが開弁圧 １２０Kg／cm2、噴射ポンプ回転速度 １５×１０２r.p.m.で破壊し、No.３のものが開弁圧１
００Kg／cm2、噴射ポンプの回転速度 ４×１０２r.p.m.で破壊したのに対し、本発明のNo.１
のものは開弁圧１８０Kg／cm2、噴射ポンプの回転速度
１５×１０２r.p.m.まで破壊しなかった。 The test results are shown in FIG. No. 1 in FIG. 3 is a nozzle body of the present invention, No. 2 and No. 3 are conventional nozzle bodies, and No. 2 has a valve opening pressure of 120 kg / cm 2 and an injection pump rotation speed. It was destroyed at × 10 2 rpm and No. 3 had a valve opening pressure of 1
No. 1 of the present invention, while destruction was performed at 00 kg / cm 2 and a rotation speed of the injection pump of 4 × 10 2 rpm.
The material did not break up to a valve opening pressure of 180 kg / cm 2 and an injection pump rotation speed of 15 × 10 2 rpm.
このことから、本発明のノズルボディーが極めて高い耐
久性のあることが明らかとなった。From this, it became clear that the nozzle body of the present invention has extremely high durability.
第１図はこの発明のノズルボディーと針弁の組立縦断面
図、第２図は第１図に示すノズルボディーの平面図、第
３図は実験結果を示すグラフ、及び第４図は従来のノズ
ルボディーと針弁の組立縦断面図である。 １……燃料噴射ノズルボディー、２……噴口、３……小
径部、４……大径部、５……肩部、６……弁孔、７……
弁座、８……ノズルホルダー、１１……当接面、１０６
……針弁FIG. 1 is a vertical cross-sectional view of an assembly of a nozzle body and a needle valve according to the present invention, FIG. 2 is a plan view of the nozzle body shown in FIG. 1, FIG. 3 is a graph showing experimental results, and FIG. It is an assembly longitudinal cross-sectional view of a nozzle body and a needle valve. 1 ... Fuel injection nozzle body, 2 ... Injection port, 3 ... Small diameter part, 4 ... Large diameter part, 5 ... Shoulder part, 6 ... Valve hole, 7 ...
Valve seat, 8 ... Nozzle holder, 11 ... Contact surface, 106
...... Needle valve
Claims (1)
部とを肩部を境にして備えるセラミック製の燃料噴射ノ
ズルボディーであって、前記肩部の少なくとも一部分が
頂角が１２０°〜６０°をなすテーパー面をなすことを
特徴とするディーゼル機関の燃料噴射ノズルボディー1. A fuel injection nozzle body made of ceramic, comprising a small diameter portion on the tip end side having an injection port and a large diameter portion on the base end side as a boundary, and at least a part of the shoulder portion has a vertical angle. Fuel injection nozzle body for a diesel engine, characterized in that it has a tapered surface of 120 ° to 60 °
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61051100A JPH0660609B2 (en) | 1986-03-07 | 1986-03-07 | Fuel injection nozzle body of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61051100A JPH0660609B2 (en) | 1986-03-07 | 1986-03-07 | Fuel injection nozzle body of diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62210258A JPS62210258A (en) | 1987-09-16 |
| JPH0660609B2 true JPH0660609B2 (en) | 1994-08-10 |
Family
ID=12877388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61051100A Expired - Lifetime JPH0660609B2 (en) | 1986-03-07 | 1986-03-07 | Fuel injection nozzle body of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0660609B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19508636A1 (en) * | 1995-03-10 | 1996-09-12 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
| DE19523243B4 (en) * | 1995-06-27 | 2009-04-02 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines with a clamping nut with a conically formed annular shoulder |
| DE10115325A1 (en) * | 2001-03-28 | 2002-10-17 | Bosch Gmbh Robert | Fuel injector, for an IC motor, has a clamp system to hold the injector housing at the base body, with a convex curvature in a ball segment shape at the clamping surface for an increased sealing action |
| JP7435211B2 (en) * | 2020-04-27 | 2024-02-21 | 株式会社豊田自動織機 | engine structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56157369U (en) * | 1980-04-25 | 1981-11-24 |
-
1986
- 1986-03-07 JP JP61051100A patent/JPH0660609B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62210258A (en) | 1987-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |