JPS58222971A - Fuel injection valve - Google Patents
Fuel injection valveInfo
- Publication number
- JPS58222971A JPS58222971A JP57106178A JP10617882A JPS58222971A JP S58222971 A JPS58222971 A JP S58222971A JP 57106178 A JP57106178 A JP 57106178A JP 10617882 A JP10617882 A JP 10617882A JP S58222971 A JPS58222971 A JP S58222971A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle hole
- fuel
- combustion chamber
- diameter
- spray
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/184—Discharge orifices having non circular sections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1846—Dimensional characteristics of discharge orifices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は内燃機関用燃料噴射弁の改善に関する。[Detailed description of the invention] The present invention relates to improvements in fuel injection valves for internal combustion engines.
従来の直接噴射式ディーゼル機関の燃料噴射装置を第１
図に示す。図において、０１は燃料噴射ポンプのノ°ラ
ンジャ、０２は吐出弁室、０３は燃料噴射管、０４は燃
料噴射弁ホルダ、０５は燃料噴射弁、０６は針弁、０７
は燃料噴射弁の噴孔袋部、０８は噴孔である。第２図は
噴孔部を拡大して示す断面図である。噴孔０８は直径ｄ
の円形断面の円筒形状となっておシ、その長さｔは噴孔
袋部０７の内周半径ｒ と外周半径Ｒの差、 ｆｆ１Ｊ
ら肉厚と等しい。The first fuel injection system for conventional direct injection diesel engines
As shown in the figure. In the figure, 01 is the plunger of the fuel injection pump, 02 is the discharge valve chamber, 03 is the fuel injection pipe, 04 is the fuel injection valve holder, 05 is the fuel injection valve, 06 is the needle valve, 07
08 is the nozzle hole bag portion of the fuel injector, and 08 is the nozzle hole. FIG. 2 is an enlarged cross-sectional view of the nozzle hole section. Nozzle hole 08 has a diameter d
It has a cylindrical shape with a circular cross section, and its length t is the difference between the inner radius r and the outer radius R of the nozzle hole bag 07, ff1J
is equal to wall thickness.
直接噴射式ディーゼル機関では混合気をシリンダ内で形
成させるため、燃料噴射ポンプのグジンジャ０１にて燃
料油を高圧化し燃料噴射管０３及び燃料噴射弁ホルダ０
４によシ連結された燃料噴射弁０５の噴孔０８から燃焼
室（図示せず）内に噴射して燃料噴霧とする。In a direct injection type diesel engine, in order to form an air-fuel mixture within the cylinder, the fuel oil is made to high pressure in the fuel injection pump's gujinja 01, and the fuel oil is pressurized in the fuel injection pipe 03 and the fuel injection valve holder 0.
The fuel is injected into a combustion chamber (not shown) from a nozzle hole 08 of a fuel injection valve 05 connected to a fuel injection valve 4 to form fuel spray.
しかし、上記のものでは次の欠点がある。However, the above method has the following drawbacks.
高圧化された燃料油は噴孔袋部０７に保持されるが同噴
孔袋部０７が十分な強度がなければならない。即ち、燃
料油の圧力をＰｆとし、燃焼室内の空気圧力をＰ とす
ると、噴孔袋部０７にかかる力Ｆは、Ｆ＝＝πｒ 、”
（Ｐ（Ｐρとなる。これはＡ８−πＲ８−πｒ８−π
（Ｒ８＋ｒ８）ｔで受けなければならない。燃料油の圧
力Ｐ、が高いほど肉厚りは大きくなければならない。The highly pressurized fuel oil is held in the nozzle hole bag portion 07, but the nozzle hole bag portion 07 must have sufficient strength. That is, when the pressure of fuel oil is Pf and the air pressure inside the combustion chamber is P, the force F applied to the nozzle hole bag 07 is F==πr,
(P(Pρ. This is A8-πR8-πr8-π
It must be received at (R8+r8)t. The higher the fuel oil pressure P, the greater the wall thickness must be.
一方、燃料を十分に微粒化するには噴孔０８の直径ｄは
小である必要がある。On the other hand, in order to sufficiently atomize the fuel, the diameter d of the nozzle hole 08 needs to be small.
従って、肉厚ｔと噴孔ｏ８の直径ｄとの比ｔ／ｄはます
ます大きくなる傾向にある。しかし、これは燃料噴霧形
成上、燃料が噴孔ｏ８の内壁面の影響を受は噴孔出口で
の噴霧の発達を妨げ、噴霧の拡がり角度を小さなものと
してしまう。これにょシ燃焼室内での混合気形成が不完
全となシ、ディーゼル機関の燃焼性能が十分で無くなる
場合があった。Therefore, the ratio t/d between the wall thickness t and the diameter d of the nozzle hole o8 tends to become larger and larger. However, when forming the fuel spray, the fuel is affected by the inner wall surface of the nozzle hole o8, which hinders the development of the spray at the outlet of the nozzle hole and makes the spread angle of the spray small. In this case, the mixture formation in the combustion chamber was incomplete, and the combustion performance of the diesel engine was sometimes insufficient.
本発明の目的は上記の点に着目し、噴孔による燃料噴霧
発達の改善を実現し燃焼性能の良好な機関の実現できる
燃料噴射弁を提供することであシ。SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel injection valve that improves the development of fuel spray through the nozzle hole and provides an engine with good combustion performance.
その特徴とするところは、噴孔袋部と燃焼室とを連通ず
る噴孔を途中から上記燃焼室側の断面積を拡大して形成
したことである。Its feature is that the nozzle hole that communicates the nozzle hole bag with the combustion chamber is formed by enlarging the cross-sectional area on the combustion chamber side from the middle.
即ち、噴孔の燃焼室側へ・の出口部を噴孔径よシ大きな
径としたことである。この場合は出口部をチー・ぐ状あ
るいは段付テーパ状あるいは円筒状として、実質的に噴
孔の径ｄと噴孔の長さｔ′の比ｚ／ｃ＋を小とし、噴孔
部の肉厚ｔを一定に保ち２強度を十分に保って、噴霧の
発達を促進することができる。That is, the diameter of the outlet portion of the nozzle hole toward the combustion chamber is made larger than the diameter of the nozzle hole. In this case, the outlet part is made into a toothed shape, a stepped taper shape, or a cylindrical shape, and the ratio z/c+ of the diameter d of the nozzle hole and the length t' of the nozzle hole is made small, so that the thickness of the nozzle hole part is reduced. The development of the spray can be promoted by keeping the thickness t constant and maintaining sufficient strength.
以下図面を参照して本発明による実施例につき説明する
。Embodiments of the present invention will be described below with reference to the drawings.
第４図は本発明による第１実施例の噴孔部を示す断面図
、第５図は第４図のＡ矢視図である。FIG. 4 is a sectional view showing the nozzle hole portion of the first embodiment of the present invention, and FIG. 5 is a view taken in the direction of arrow A in FIG. 4.
図において、０６は燃料噴射弁の針弁、０７は燃料噴射
弁の噴孔袋部、０９は噴孔である。In the figure, 06 is the needle valve of the fuel injection valve, 07 is the nozzle hole bag portion of the fuel injection valve, and 09 is the nozzle hole.
上記構成の場合の作用、効果について述べる。The functions and effects of the above configuration will be described.
燃料噴射ポンプのシランジャｏ１にて燃料油を高圧化し
、燃料噴射管０３及び燃料噴射弁ボルダ０４によシ連結
された噴孔０９から燃焼室内へ噴射して、燃料噴霧とす
る。Fuel oil is made highly pressurized by the sylanger o1 of the fuel injection pump, and is injected into the combustion chamber from the nozzle hole 09 connected to the fuel injection pipe 03 and the fuel injection valve boulder 04 to form fuel spray.
この時、噴孔０９は噴孔袋部ｏ７よシ外部へ直径ｄの丸
孔となっているが、燃焼室側の出口に至る途中ｔ′の距
離で直径ｄよシ大きい直径ｄ、の円孔に段付きで拡がっ
ておシ、さらに出口ではｄｌよ勺大きな径ｄ２の円形断
面となっているため、噴孔よシ燃焼室へ流れ出る燃料は
燃料噴射弁内部よ １゛□９ｔ′の距離、外部よシｈ
の距離にて、噴孔内壁面で拘束されているが、噴孔の断
面積が急に拡大するだめ、拘束から解放されて、霧化を
開始し噴霧を形成し始める。さらに出口形状をテーパ状
としているので再び噴霧し噴孔内面の干渉が著しく生じ
ない。即ち、実質的に噴孔径ｄと噴孔長さとの比はｔ’
／ｄとなり 、 ｔ／ｄより小さくなっている。一方、
噴孔部の肉厚はｔに保たれてお９２強度を著しく損なう
ことはない。噴孔長さに対する噴孔径の比が小さいと噴
霧の拡が９が大きくなシ、混合気形成に有利であること
は従来から認められているところであり２本発明によれ
ば微粒化する上から噴孔−径ｄを小さくするとしても、
肉厚ｔを保ってｔ７ｄを小さくできる。従って、直接噴
射式ディーゼル機関において、混合気形成を改善するこ
とができ、燃焼性能を改善することができる。At this time, the nozzle hole 09 is a round hole with a diameter d extending outward from the nozzle hole bag part o7, but at a distance t' on the way to the outlet on the combustion chamber side, a circle with a diameter d larger than the diameter d is formed. The hole is stepped and widened, and the outlet has a circular cross section with a diameter d2 that is larger than dl, so the fuel flowing from the nozzle hole into the combustion chamber is 1゛□9t' from the inside of the fuel injection valve. , outside
At a distance of , it is restrained by the inner wall surface of the nozzle hole, but as the cross-sectional area of the nozzle hole suddenly expands, it is released from the restraint and begins to atomize and form a spray. Furthermore, since the outlet shape is tapered, there is no significant interference with the inner surface of the nozzle hole when the spray is sprayed again. That is, substantially the ratio of the nozzle hole diameter d to the nozzle hole length is t'
/d, which is smaller than t/d. on the other hand,
The wall thickness of the nozzle hole portion is maintained at t without significantly impairing the strength. It has long been recognized that a small ratio of the nozzle hole diameter to the nozzle hole length increases the spread of the spray and is advantageous for forming a mixture. Even if the nozzle hole diameter d is made smaller,
It is possible to reduce t7d while maintaining the wall thickness t. Therefore, in a direct injection diesel engine, mixture formation can be improved and combustion performance can be improved.
第６図は本発明による第２実施例の噴孔部を示す断面図
、第７図は第６図のＡ矢視図である。FIG. 6 is a sectional view showing a nozzle hole portion of a second embodiment of the present invention, and FIG. 7 is a view taken in the direction of arrow A in FIG. 6.
第１実施例において、出口径ｄ２が噴霧角２θとの関係
において、テーパ深さがｈであるから。In the first embodiment, the taper depth is h in relation to the outlet diameter d2 and the spray angle 2θ.
ｄｚ＞２ｈｔａｎθ＋ｄであれば、噴孔内面において再
び噴霧が接触することはない。If dz>2htanθ+d, the spray will not come into contact with the inner surface of the nozzle hole again.
従って、ｄ、＝＝ｄとして、出口形状を単純なテーパ状
としてもよい。Therefore, the outlet shape may be a simple tapered shape by setting d==d.
即ち、この場合の形状の噴孔部０を設けたものである。That is, the nozzle hole portion 0 having the shape in this case is provided.
その作用２効果は第１実施例と同じである。The second effect is the same as the first embodiment.
さらに、 ｄ１＝：ｄｌとして、 ｄｌ：）ｄで。Furthermore, as d1=:dl, with dl:)d.
ｄｌ＝ｄ２）２ｈｔａｎθ＋ｄであれば、出ロ形状ヲ単
純な円筒形としても良い。If dl=d2)2htanθ+d, the protrusion shape may be a simple cylindrical shape.
第１図は従来の直接噴射式ディーゼル機関の燃料噴射装
置を示す説明図、第２図は第１図の燃料噴射弁の噴孔部
を示す断面図、第３図は第２図のＡ矢視図、第４図は本
発明による第１実施例の噴孔部を示す断面図、第５図は
第４図のＡ矢視図。
第６図は本発明による第２実施例の噴孔部を示す断面図
、第７図は第６図のＡ矢視図である。
０６・・・針弁、０７・・・噴孔袋部、０９．１０・・
・噴■ ・
第３関
牙４図
才５聞
６０
オフ凶Fig. 1 is an explanatory diagram showing a conventional fuel injection device for a direct injection diesel engine, Fig. 2 is a sectional view showing the injection hole of the fuel injection valve in Fig. 1, and Fig. 3 is an arrow A in Fig. 2. 4 is a sectional view showing the nozzle hole portion of the first embodiment of the present invention, and FIG. 5 is a view taken in the direction of arrow A in FIG. 4. FIG. 6 is a sectional view showing a nozzle hole portion of a second embodiment of the present invention, and FIG. 7 is a view taken in the direction of arrow A in FIG. 6. 06...Needle valve, 07...Blow hole bag, 09.10...
・Spout■ ・3rd Guanga 4 illustrations 5 words 60 Off-Kyo
Claims (1)
とを連通ずる噴孔を途中から上記燃焼室側の断面積を拡
大して形成したことを特徴とする燃料噴射弁。1. A fuel injection valve for an internal combustion engine, characterized in that a nozzle hole that communicates between a nozzle hole bag and a combustion chamber is formed by enlarging the cross-sectional area on the combustion chamber side from the middle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57106178A JPS58222971A (en) | 1982-06-22 | 1982-06-22 | Fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57106178A JPS58222971A (en) | 1982-06-22 | 1982-06-22 | Fuel injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58222971A true JPS58222971A (en) | 1983-12-24 |
Family
ID=14426983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57106178A Pending JPS58222971A (en) | 1982-06-22 | 1982-06-22 | Fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58222971A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5163621A (en) * | 1989-12-12 | 1992-11-17 | Nippondenso Co., Ltd. | Fuel injection valve having different fuel injection angles at different opening amounts |
| US5353992A (en) * | 1993-08-30 | 1994-10-11 | Chrysler Corporation | Multi-hole injector nozzle tip with low hydraulic plume penetration and large cloud-forming properties |
| WO2005064150A1 (en) * | 2003-12-29 | 2005-07-14 | Robert Bosch Gmbh | Fuel injection valve |
| WO2007017305A1 (en) * | 2005-08-05 | 2007-02-15 | Robert Bosch Gmbh | Fuel injection valve and method for shaping discharge ports |
| WO2013091963A1 (en) * | 2011-12-20 | 2013-06-27 | Robert Bosch Gmbh | Fuel injection valve and method for forming ejection openings |
| CN104088742A (en) * | 2014-06-22 | 2014-10-08 | 中国北方发动机研究所(天津) | Step type orifice oil nozzle |
| CN104976006A (en) * | 2014-04-07 | 2015-10-14 | 株式会社电装 | Fuel injector |
| JP2016070253A (en) * | 2014-10-01 | 2016-05-09 | トヨタ自動車株式会社 | Fuel injection valve |
| DE102014226762A1 (en) * | 2014-12-22 | 2016-06-23 | Continental Automotive Gmbh | Nozzle body and fluid injection valve |
| DE102014226770A1 (en) * | 2014-12-22 | 2016-06-23 | Continental Automotive Gmbh | Nozzle body and fluid injection valve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5412626U (en) * | 1977-06-29 | 1979-01-26 | ||
| JPS55152360U (en) * | 1979-04-19 | 1980-11-04 |
-
1982
- 1982-06-22 JP JP57106178A patent/JPS58222971A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5412626U (en) * | 1977-06-29 | 1979-01-26 | ||
| JPS55152360U (en) * | 1979-04-19 | 1980-11-04 |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5163621A (en) * | 1989-12-12 | 1992-11-17 | Nippondenso Co., Ltd. | Fuel injection valve having different fuel injection angles at different opening amounts |
| US5353992A (en) * | 1993-08-30 | 1994-10-11 | Chrysler Corporation | Multi-hole injector nozzle tip with low hydraulic plume penetration and large cloud-forming properties |
| WO2005064150A1 (en) * | 2003-12-29 | 2005-07-14 | Robert Bosch Gmbh | Fuel injection valve |
| WO2007017305A1 (en) * | 2005-08-05 | 2007-02-15 | Robert Bosch Gmbh | Fuel injection valve and method for shaping discharge ports |
| JP2009503353A (en) * | 2005-08-05 | 2009-01-29 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Fuel injection valve and method for machining an injection opening |
| WO2013091963A1 (en) * | 2011-12-20 | 2013-06-27 | Robert Bosch Gmbh | Fuel injection valve and method for forming ejection openings |
| CN104976006A (en) * | 2014-04-07 | 2015-10-14 | 株式会社电装 | Fuel injector |
| JP2015200214A (en) * | 2014-04-07 | 2015-11-12 | 株式会社デンソー | fuel injection valve |
| CN104088742A (en) * | 2014-06-22 | 2014-10-08 | 中国北方发动机研究所(天津) | Step type orifice oil nozzle |
| JP2016070253A (en) * | 2014-10-01 | 2016-05-09 | トヨタ自動車株式会社 | Fuel injection valve |
| DE102014226762A1 (en) * | 2014-12-22 | 2016-06-23 | Continental Automotive Gmbh | Nozzle body and fluid injection valve |
| DE102014226770A1 (en) * | 2014-12-22 | 2016-06-23 | Continental Automotive Gmbh | Nozzle body and fluid injection valve |
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