JPS59147864A - Fuel injection valve for diesel engine - Google Patents
Fuel injection valve for diesel engineInfo
- Publication number
- JPS59147864A JPS59147864A JP2055283A JP2055283A JPS59147864A JP S59147864 A JPS59147864 A JP S59147864A JP 2055283 A JP2055283 A JP 2055283A JP 2055283 A JP2055283 A JP 2055283A JP S59147864 A JPS59147864 A JP S59147864A
- Authority
- JP
- Japan
- Prior art keywords
- needle
- fuel
- stage
- injection hole
- injection
- 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
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はディーゼルエンジンの燃料噴射弁（噴射ノズル
ともいう）に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection valve (also referred to as an injection nozzle) for a diesel engine.
＠唄式ディーゼルエンジンによく使用されるホール式燃
料噴射弁はその燃料噴射特性上エンンンの燃焼騒音が大
きくなるといわれている。スロットル型燃料噴射弁の場
合には一開弁初期の噴射址が制限されているために、発
火と同時に燃焼する燃料量が制限されて上記噴射弁より
騒音が低いと考えられている。しかしながら、複数の噴
孔により燃料を燃焼室に分散させる方式の＠噴式ディー
ゼルエンン／には、上記スロットル型噴射弁はそのまま
利用することは困難と考えられる。本発明の目的は開弁
初期の唄゛射鎗を制限してエンジンの燃焼騒音を低減す
るホール型燃料噴射弁を提供することにある。Hall-type fuel injection valves, which are often used in Uta-type diesel engines, are said to produce a loud engine combustion noise due to their fuel injection characteristics. In the case of a throttle-type fuel injection valve, since the injection area at the initial stage of opening is limited, the amount of fuel that is ignited and combusted at the same time is limited, and it is thought that the noise is lower than that of the above-mentioned injection valves. However, it is considered difficult to use the above-mentioned throttle-type injection valve as is in an injection-type diesel engine that uses a plurality of nozzle holes to disperse fuel into a combustion chamber. SUMMARY OF THE INVENTION An object of the present invention is to provide a Hall-type fuel injection valve that reduces engine combustion noise by limiting injection during the initial stage of valve opening.
本発明によるディーゼルエンジンの燃料噴射弁は、弁本
体内に導入された燃料の圧力によりニードルをリフトさ
せて弁本体先端部の噴孔から燃料を噴射させるようにし
たディーゼルエンジンの燃料噴射弁において、前記弁本
体先端部は第１段目の噴孔を具えたノート部と、該ノー
ト部からざらに先端側に円筒状に延長されて第２段目の
噴孔を具えた嵌合部とから形成され、ニードルは前記弁
本体の／−ト部及び嵌合部に係合■」能な形状とされて
そのリフトに従って先づ第１段目の噴孔を開かせ次いで
第２段目の噴孔全開かせるように形成されることを特徴
とするものである。The fuel injection valve for a diesel engine according to the present invention is a fuel injection valve for a diesel engine in which the needle is lifted by the pressure of the fuel introduced into the valve body to inject fuel from the nozzle hole at the tip of the valve body. The tip portion of the valve body includes a notebook portion provided with a first-stage nozzle hole, and a fitting portion extending roughly cylindrically from the note portion toward the tip side and provided with a second-stage nozzle hole. The needle has a shape that can be engaged with the /-to part and the fitting part of the valve body, and according to the lift, the first stage nozzle hole is first opened, and then the second stage nozzle hole is opened. It is characterized by being formed so that the hole is fully opened.
以下本発明を実施例について図面を参照して説明する。The present invention will be described below with reference to the drawings.
第１図は本発明によるディーゼルエンジンの燃料噴射弁
の１夾施しＩＪの断面図、紀２図は第１図の九枠部の拡
大詳細図である。ｌｆ′ｉ炉科噴射弁、２はノズルボデ
ィ、３はノズルニート”ルである。４は図示しない燃料
噴射ポンプによって加圧きれた燃料を噴射弁内部に導入
するための燃料通路であり、ノズルボディ２内の燃料通
路５に通じている。FIG. 1 is a cross-sectional view of one IJ of the fuel injection valve for a diesel engine according to the present invention, and FIG. 2 is an enlarged detailed view of the ninth frame portion of FIG. 1. lf'i fuel injection valve, 2 is a nozzle body, 3 is a nozzle neat "le", 4 is a fuel passage for introducing the pressurized fuel into the inside of the injection valve by a fuel injection pump (not shown); It communicates with a fuel passage 5 within the body 2.
ニードル３は従来のものと同様にその上端部においてブ
レノンヤスプリング（図示せず）によって図の下方に向
かつて付勢される。ニードル３はその中間部に上方に向
かって拡大されたテーパ一部６を有し、導入された燃料
の圧力によって上方に付勢されるようになっている。The needle 3 is biased downwardly in the figure by a Brennon-ya spring (not shown) at its upper end, as in the prior art. The needle 3 has a tapered portion 6 in its middle portion that expands upward, and is biased upward by the pressure of the introduced fuel.
第２図にはノズルボディ２及びニードル３の先端部が詳
細に示されている。ノズルボディ２には環状に先細りと
なった／−ト都ＩＯが形成され。FIG. 2 shows the nozzle body 2 and the tip of the needle 3 in detail. The nozzle body 2 is formed with an annularly tapered IO.
このシート部１０の環状壁を貫通ずる第１段目の噴孔１
■が設けられる。ノズルボディ２のさらに先端側には円
筒壁面からなる嵌合部１２が形成される。嵌合部１２の
先は盲端となってその窪みに液だまり■３が形成される
。嵌合部■２の円筒面終端部には液たまり１３周壁を貫
通する第２段目の噴孔１４が設けられる。The first stage nozzle hole 1 passes through the annular wall of this seat portion 10.
■ will be provided. Further on the distal end side of the nozzle body 2, a fitting portion 12 made of a cylindrical wall surface is formed. The tip of the fitting part 12 becomes a blind end, and a liquid pool (3) is formed in the recess. A second stage nozzle hole 14 penetrating the peripheral wall of the liquid pool 13 is provided at the end of the cylindrical surface of the fitting part (2).
ニードル３の先端部はノズルボディ２に対応して形成さ
ｔする。即ち、／−ト部１０と係合するテーパ一部１５
と、嵌合部１２と係合する円柱部１６とが形成される。The tip of the needle 3 is formed to correspond to the nozzle body 2. That is, the tapered portion 15 that engages with the /-t portion 10
and a cylindrical portion 16 that engages with the fitting portion 12 are formed.
ノズルボディ２の７一ト部１０とニート′ル３のテーパ
一部１５とはニードル３が下方向に付勢されているとき
に面接触してこれら間から燃料が通過するのが阻止され
、ニート°ル３が上方にリフトされると両者間の環状間
隙を通って第１段目の噴孔１１及び液だまり１３に向か
って燃料が流れることができるようになっている。The 7-point portion 10 of the nozzle body 2 and the tapered portion 15 of the needle 3 come into surface contact when the needle 3 is urged downward, preventing fuel from passing between them. When the needle 3 is lifted upward, fuel can flow toward the first stage nozzle hole 11 and the liquid pool 13 through the annular gap between them.
ノズルボディ２の嵌合部１２とニードル３の円柱部１６
とは液密を保持しつつ摺・動可能に嵌合されるようにな
っている。従って、円柱部１６が嵌合部１２に嵌合され
ている間はこれら間から燃料が通過するのが阻止され、
ニート°ル３がさらに上方にリフトされて円筒状嵌合部
１２から抜けると両者間を通って液たまり１３及び第２
段目の噴孔１４に燃料が流れることができるようになる
。Fitting portion 12 of nozzle body 2 and cylindrical portion 16 of needle 3
The two are designed to be slidably and movably fitted while maintaining liquid tightness. Therefore, while the cylindrical part 16 is fitted into the fitting part 12, fuel is prevented from passing between them.
When the needle 3 is further lifted upward and removed from the cylindrical fitting part 12, a liquid pool 13 and a second liquid pass between the two.
Fuel can now flow to the nozzle holes 14 of the stage.
この災施例に示された燃料噴射弁の作用は上の説明から
明らかでろろう。即ち、燃料通路４から導入されてニー
ドル受圧面（テーパ一部）６に作用する燃料の圧力がプ
レッシャスプリング（図示せず）による下向きの付勢力
に打勝つと、ニードル３は上方にリフトすることになる
。ニート”ル３がリフトすると、先づニードル３のテー
パ一部■５が７一ト部１０から離れ、第１段目の噴孔１
１が開かれて燃料が噴射される。このときに、ニードル
３の円柱部■６はおる長さをもっているために未だ嵌合
部１２と係合したままであり、従って、第２段目の噴孔
１４からの燃料噴射はない。続いてニードル３がリフト
すると、ニードル３の円柱゛ 部１６が嵌合部１２から
抜けて燃料が液だまり１３に流れ込み、第２段目の噴孔
■４から噴射される。The operation of the fuel injector shown in this disaster example will be clear from the above description. That is, when the pressure of the fuel introduced from the fuel passage 4 and acting on the needle pressure receiving surface (tapered part) 6 overcomes the downward biasing force of the pressure spring (not shown), the needle 3 is lifted upward. become. When the needle 3 lifts, first the taper part 5 of the needle 3 separates from the 7th part 10, and the nozzle hole 1 of the first stage is removed.
1 is opened and fuel is injected. At this time, since the cylindrical portion (6) of the needle 3 has a length that allows it to pass through, it still remains engaged with the fitting portion 12, and therefore, there is no fuel injection from the second stage nozzle hole 14. Subsequently, when the needle 3 is lifted, the cylindrical part 16 of the needle 3 comes out of the fitting part 12, the fuel flows into the liquid pool 13, and is injected from the second stage nozzle hole 4.
このときに、燃料は第１段目の噴孔１１及び第２段目の
噴孔１４の双方から噴射されることになる。At this time, fuel is injected from both the first-stage nozzle holes 11 and the second-stage nozzle holes 14.
ここで、第１段目の噴孔１１の孔径を第２段目の噴孔１
４の孔径より相対的に小ざくしておくと、開弁初期の噴
射量が制限され、第３図に示されるような燃料噴射率特
性が得られる。ニードル３の円柱部１６の長さを適当に
定めることによって初期噴射部分Ｘ及び最大噴射流縦部
分Ｙの好ましいパターンが得られることになる。そして
、このような噴射流量特性により、従来のホール型ノズ
ルを用いた場合よりも騒音は低下される。Here, the hole diameter of the first stage nozzle hole 11 is set to the second stage nozzle hole 1.
If the hole diameter is made relatively smaller than No. 4, the injection amount at the initial stage of valve opening will be limited, and the fuel injection rate characteristics as shown in FIG. 3 will be obtained. By appropriately determining the length of the cylindrical portion 16 of the needle 3, a preferred pattern of the initial injection portion X and the maximum jet flow longitudinal portion Y can be obtained. Due to such injection flow rate characteristics, noise is reduced compared to when a conventional hole-type nozzle is used.
上述の実施例においては、ノズルボディ２の嵌合部工２
とニードル３の円柱部１６とは、これらが嵌合きれてい
るときに第２段目の噴孔１４が閉じられ且つ円柱部１６
が嵌合部１２から抜けたときに第２段目の噴孔が開かれ
るようになっていｆｃ。In the above embodiment, the fitting part 2 of the nozzle body 2
and the cylindrical portion 16 of the needle 3. When these are fully fitted, the second stage nozzle hole 14 is closed and the cylindrical portion 16
When fc comes out of the fitting part 12, the second stage nozzle hole is opened.
しかしながら、嵌合部１２又は円柱部の一力に軸方向に
部分的に勉ひる溝を設けることによって。However, by providing a partial groove in the axial direction in one force of the fitting part 12 or the cylindrical part.
円柱部１６が嵌合部１２に嵌合されたまま抜ける、こと
なしに上記内作用が行われるようにすることも可能であ
る。It is also possible to perform the above-mentioned internal action without the cylindrical portion 16 coming off while being fitted into the fitting portion 12.
上述しｆＣ実施例による燃料噴射弁を直接噴射式ディー
ゼルエンジンに装着する場合には、第４図に示されるよ
うに、第１段目の噴孔１１のｌ１ＩＩ線Ｂと第２段目の
噴孔工４の軸線Ｃが、例えばピストン２０頂部の凹陥部
によって形成される燃焼室２１のＩＩＩ＋ 壁面で交差
する、即ち、図にｈで示きれる同じ高きの位置に向かっ
ているのが好ましい。これは理論的な解析は難しいが、
実験により確認された墨でおり、これによりエンジン性
能を低下きせることなく騒音をさらに低減することが１
」能でるる。When the fuel injection valve according to the fC embodiment described above is installed in a direct injection diesel engine, as shown in FIG. Preferably, the axes C of the boreholes 4 intersect, for example, at the III+ wall of the combustion chamber 21 formed by the recess in the top of the piston 20, that is to say towards the same elevated position, indicated by h in the figure. This is difficult to analyze theoretically, but
This has been confirmed through experiments, and it is possible to further reduce noise without reducing engine performance.
” Node Ruru.
以上説明したように、本発明によれはエンジン性能ｒ低
下させることなく騒音？低減することが掬ｊ能でおり、
燃料噴射弁自体の基本的な構成に大きな変化を与えるこ
となく部分的な改良によって上記効果を得ることができ
るので比較的安価で信頼性をもって従来同様のエンジン
への適合が可能As explained above, the present invention can reduce noise without reducing engine performance. It is possible to reduce
The above effects can be obtained through partial improvements without making any major changes to the basic structure of the fuel injection valve itself, so it can be applied to conventional engines at a relatively low cost and with reliability.
菓１図６本発明の１実施り１１の断面図、第２図は第１
図の九枠へ部の拡大詳細図、第３図は本発明による燃料
噴射弁の噴射率特性図、第４図は本発明による燃料噴射
弁を面接噴射式ディーゼルエンジンに装着する場合の１
態様を示す図である。
２・・ノズルボディ、３・・ニードル、］０・ ／−ト
部、１】・・第１段目の噴孔、１２・・・嵌合部、１４
・・・第２段目の噴孔、１５・・・テーパ一部、１６・
・・円柱部。
特許内靴１人
トヨタ自動車株式会社
特許出願代理人
弁理士 青 木 朗
弁理士 西 舘 和 之
弁理士 中 山 恭 介
弁理士 山 口 昭 之
第１図
第３図
第４図Fig. 1 is a cross-sectional view of one embodiment 11 of the present invention;
FIG. 3 is an injection rate characteristic diagram of the fuel injection valve according to the present invention, and FIG. 4 is an enlarged detailed view of the ninth frame in the figure.
It is a figure showing an aspect. 2... Nozzle body, 3... Needle, ]0//-to part, 1]... First stage nozzle hole, 12... Fitting part, 14
...Second stage nozzle hole, 15...Taper part, 16.
...Cylindrical part. 1 Patent Attorney: Toyota Motor Corporation Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate Patent Attorney Kyo Nakayama Akira Yamaguchi Figure 1 Figure 3 Figure 4
Claims (1)
トさせて弁本体先端部の噴孔から燃料を噴射きせるよう
に１７たディーゼルエンジンのｆｆｉ’Ｎ噴射弁におい
て、前記弁本体先端部は第１段目の噴孔を具えた／−ト
部と、該７一ト部からさらに先端側に円筒状に延長され
て第２段目の噴孔を具えた吠合部とから形成され、ニー
ドルは前記弁本体のノート部及び嵌合部に係合可能な形
状とされてそのリフトに従って先づ第１段目の噴孔を開
かせ次いで第２段目の噴孔を開かせるように形成される
ことを特徴とするディーゼルエンジンの燃料噴射弁。In an ffi'N injection valve for a diesel engine, the needle is lifted by the pressure of fuel introduced into the valve body, and fuel is injected from the nozzle hole at the tip of the valve body. The needle is formed of a 7-part part provided with a 7-stage nozzle hole, and a cylindrical joint part that extends cylindrically from the 7-part part toward the distal end and is provided with a 2nd-stage nozzle hole. It has a shape that can be engaged with the note part and the fitting part of the valve body, and is formed so as to first open the first stage nozzle hole and then open the second stage nozzle hole according to the lift. A fuel injection valve for a diesel engine characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2055283A JPS59147864A (en) | 1983-02-12 | 1983-02-12 | Fuel injection valve for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2055283A JPS59147864A (en) | 1983-02-12 | 1983-02-12 | Fuel injection valve for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59147864A true JPS59147864A (en) | 1984-08-24 |
Family
ID=12030314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2055283A Pending JPS59147864A (en) | 1983-02-12 | 1983-02-12 | Fuel injection valve for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59147864A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6238871A (en) * | 1985-08-09 | 1987-02-19 | Fuji Heavy Ind Ltd | Fuel injection nozzle device for engine |
| JPS62137381U (en) * | 1986-02-24 | 1987-08-29 | ||
| WO1988008081A1 (en) * | 1987-04-07 | 1988-10-20 | Kabushiki Kaisha Komatsu Seisakusho | Internal combustion engine |
| WO1994027042A1 (en) * | 1993-05-07 | 1994-11-24 | Lucas Industries Public Limited Company | Fuel injection nozzles |
| FR2840367A1 (en) * | 2002-06-04 | 2003-12-05 | Renault Sa | Diesel engine fuel injector comprises nozzle with holes located in rows near nozzle free end and hole sealing needle |
| EP2071178A1 (en) * | 2007-12-10 | 2009-06-17 | Delphi Technologies, Inc. | Injection nozzle |
| EP3252301A1 (en) * | 2016-06-02 | 2017-12-06 | Caterpillar Motoren GmbH & Co. KG | Fuel injector for a dual fuel engine |
| JP2017218990A (en) * | 2016-06-08 | 2017-12-14 | トヨタ自動車株式会社 | Internal combustion engine |
| US10202931B2 (en) | 2016-06-08 | 2019-02-12 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
-
1983
- 1983-02-12 JP JP2055283A patent/JPS59147864A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6238871A (en) * | 1985-08-09 | 1987-02-19 | Fuji Heavy Ind Ltd | Fuel injection nozzle device for engine |
| JPS62137381U (en) * | 1986-02-24 | 1987-08-29 | ||
| WO1988008081A1 (en) * | 1987-04-07 | 1988-10-20 | Kabushiki Kaisha Komatsu Seisakusho | Internal combustion engine |
| WO1994027042A1 (en) * | 1993-05-07 | 1994-11-24 | Lucas Industries Public Limited Company | Fuel injection nozzles |
| FR2840367A1 (en) * | 2002-06-04 | 2003-12-05 | Renault Sa | Diesel engine fuel injector comprises nozzle with holes located in rows near nozzle free end and hole sealing needle |
| EP2071178A1 (en) * | 2007-12-10 | 2009-06-17 | Delphi Technologies, Inc. | Injection nozzle |
| US7789062B2 (en) | 2007-12-10 | 2010-09-07 | Delphi Technologies Holding S.Arl | Injection nozzle |
| EP3252301A1 (en) * | 2016-06-02 | 2017-12-06 | Caterpillar Motoren GmbH & Co. KG | Fuel injector for a dual fuel engine |
| JP2017218990A (en) * | 2016-06-08 | 2017-12-14 | トヨタ自動車株式会社 | Internal combustion engine |
| US10202930B2 (en) | 2016-06-08 | 2019-02-12 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
| US10202931B2 (en) | 2016-06-08 | 2019-02-12 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
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