JPH05280442A - Injection valve of diesel engine equipped with ignition assisting device - Google Patents
Injection valve of diesel engine equipped with ignition assisting deviceInfo
- Publication number
- JPH05280442A JPH05280442A JP7720892A JP7720892A JPH05280442A JP H05280442 A JPH05280442 A JP H05280442A JP 7720892 A JP7720892 A JP 7720892A JP 7720892 A JP7720892 A JP 7720892A JP H05280442 A JPH05280442 A JP H05280442A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- injection valve
- ignition
- injection port
- fuel
- 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
- F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
-
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は着火アシスト付ディーゼ
ルエンジンの噴射弁に係り、特に高負荷時から低負荷時
までの着火性を向上できる着火アシスト付ディーゼルエ
ンジンの噴射弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection valve for an ignition assisted diesel engine, and more particularly to an injection valve for an ignition assisted diesel engine capable of improving ignitability from a high load to a low load.
【０００２】[0002]
【従来の技術】メタノールなどの着火性の低い燃料を使
用するディーゼルエンジンはたとえば図６に示す如き構
成が採用されている。2. Description of the Related Art A diesel engine using a fuel having a low ignitability, such as methanol, has a structure as shown in FIG. 6, for example.
【０００３】図示するように、この種のエンジンには燃
焼室１内に二又に燃料を分岐させて噴射するための噴射
弁２が設けられると共に、着火性を高めるためにスパー
クプラグあるいはグロープラグなどの着火アシスト装置
３が設けられている。着火アシスト装置３は熱あるいは
点火火花よって噴射弁２から噴射された燃料噴霧ｆ１，
ｆ２の内の一方の噴霧ｆ２を着火し双方の噴霧ｆ１，ｆ
２を燃焼させる。As shown in the figure, an engine of this type is provided with an injection valve 2 for bifurcating and injecting fuel into a combustion chamber 1, and a spark plug or glow plug for enhancing ignition performance. An ignition assist device 3 such as the above is provided. The ignition assist device 3 uses the fuel spray f1, which is injected from the injection valve 2 by heat or ignition sparks.
One of the sprays f2 is ignited to spray both sprays f1 and f
Burn 2
【０００４】[0004]
【発明が解決しようとする課題】ところで、燃料噴霧ｆ
１，ｆ２は噴射弁２に形成された噴口からそれぞれ均一
に噴射されているため、着火アシスト装置３は燃料噴射
量の多い全負荷時にチューニングされている。このた
め、低負荷時の着火アシスト装置３付近の燃料混合気が
稀薄になり、着火性が悪化し、失火する問題がある。ま
た、低負荷時の稀薄化を防止するために、噴射方向を着
火アシスト装置３付近に変更して集中して噴射すると、
全負荷時の空気利用率が低下し性能の悪化を招く問題が
ある。By the way, the fuel spray f
Since 1 and f2 are uniformly injected from the injection ports formed in the injection valve 2, the ignition assist device 3 is tuned at full load when the fuel injection amount is large. Therefore, there is a problem that the fuel mixture near the ignition assist device 3 under a low load becomes lean, the ignitability deteriorates, and a misfire occurs. Further, in order to prevent dilution at low load, if the injection direction is changed to near the ignition assist device 3 and concentrated injection is performed,
There is a problem that the air utilization rate at full load is reduced and the performance is deteriorated.
【０００５】図５は実開昭50-52318号に提案されたホー
ル型噴射弁を示すものであり、この噴射弁５にはノズル
ボディ６内にニードル７が設けられると共にそのニード
ル７の先端部８は円柱状に形成されている。このように
ノズル先端部８を円柱状に形成したのでは常に均一な燃
料噴霧となるため、上述したように低負荷時における着
火アシスト装置３付近の燃料混合気の稀薄化となるし、
ニードル先端部８の周囲に小断面のホール部９が形成さ
れて噴射ダレを生じる問題がある。FIG. 5 shows a Hall-type injection valve proposed in Japanese Utility Model Publication No. 50-52318, in which a needle 7 is provided in a nozzle body 6 and the tip of the needle 7 is provided. 8 is formed in a cylindrical shape. When the nozzle tip portion 8 is formed in a cylindrical shape in this way, a uniform fuel spray is always produced, and as described above, the fuel mixture near the ignition assist device 3 becomes lean when the load is low.
There is a problem that a hole 9 having a small cross section is formed around the needle tip 8 to cause jet sag.
【０００６】本発明は上記問題点を有効に解決すべく創
案されたものである。The present invention was devised to effectively solve the above problems.
【０００７】本発明は高負荷から低負荷までの着火性を
向上できる着火アシスト付ディーゼルエンジンの噴射弁
を提供することを目的とする。It is an object of the present invention to provide an injection valve for an ignition assisted diesel engine which can improve the ignitability from high load to low load.
【０００８】[0008]
【課題を解決するための手段】本発明は燃料噴射弁のニ
ードル先端部を一方の噴口に臨む側を削除して他方の噴
口に臨む側を半円断面に残存させた半円柱状に形成し、
その削除側の一方の噴口の噴射方向に着火アシスト装置
を配置したものである。According to the present invention, the needle tip of a fuel injection valve is formed in a semi-cylindrical shape in which the side facing one injection port is deleted and the side facing the other injection port remains in a semi-circular cross section. ,
The ignition assist device is arranged in the injection direction of the one injection port on the deletion side.
【０００９】[0009]
【作用】このようにニードル先端部を半円柱状に形成す
ることにより、噴射量が変化しても着火アシスト装置の
ある方向の一方の噴口からの噴射量の変化を小さくし、
高負荷から低負荷までの着火性を向上できる。By forming the needle tip into a semi-cylindrical shape in this way, even if the injection amount changes, the change in the injection amount from one injection port in the direction in which the ignition assist device is present can be reduced,
The ignitability from high load to low load can be improved.
【００１０】[0010]
【実施例】以下、本発明の一実施例を添付図面に基づい
て詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
【００１１】図１および図２はメタノールなどの着火性
の低い燃料を使用するディゼルエンジンの燃料噴射弁を
示すものであり、この燃料噴射弁１１の先端部には燃焼
室１２に臨んでニードル１３が設けられると共にこのニ
ードル１３の先端側にホール部１４を隔てて覆うように
ノズルボディ１５が設けられている。ノズルボディ１５
にはニードル１３を着座させる弁座１６が形成されると
共にホール部１４内を燃焼室１２内に開放する一対の噴
口１７，１８が形成されている。これら噴口１７，１８
は互いに反対方向に燃料を噴射するようになっている。
図示例にあっては燃焼室１２の底部側に向けて斜めに開
口される一方の噴口１７に対し、他方の噴口１８は略水
平方向に開口されている。FIGS. 1 and 2 show a fuel injection valve of a diesel engine which uses a fuel having a low ignitability such as methanol. A needle 13 facing a combustion chamber 12 is provided at a tip of the fuel injection valve 11. And a nozzle body 15 is provided on the tip side of the needle 13 so as to cover the hole portion 14 with a space therebetween. Nozzle body 15
A valve seat 16 on which the needle 13 is seated is formed therein, and a pair of injection ports 17 and 18 that open the inside of the hole portion 14 into the combustion chamber 12 are formed therein. These nozzles 17, 18
Are designed to inject fuel in opposite directions.
In the illustrated example, one injection port 17 is opened obliquely toward the bottom side of the combustion chamber 12, while the other injection port 18 is opened in a substantially horizontal direction.
【００１２】特に、燃焼室１２に臨んで順次縮径されて
円すい状に形成されたニードル１３が形成され、その先
端部１９は半円柱状に形成されて突出されている。すな
わち、図３および図４に示すように、一方の噴口１７に
臨む側が削除されて他方に臨む側が半円形断面に残存さ
れて半円柱が形成される。図示例にあっては一方の噴口
１７に臨む片面１９ａが弦方向に平坦に削り落されて噴
口１７に開放された溝部を形成し、他方の噴口１８側に
臨む片面１９ｂが円中心を含んで略半円形断面を有する
半円柱体部を形成する。In particular, a needle 13 having a conical shape which is successively reduced in diameter toward the combustion chamber 12 is formed, and a tip portion 19 thereof is formed in a semicylindrical shape and protrudes. That is, as shown in FIGS. 3 and 4, one side facing the injection port 17 is deleted and the other side is left in a semicircular cross section to form a semicylindrical column. In the illustrated example, one surface 19a facing one of the nozzles 17 is ground flat in the chord direction to form a groove opening to the nozzle 17, and the other surface 19b facing the other nozzle 18 includes a circle center. A semi-cylindrical body portion having a substantially semi-circular cross section is formed.
【００１３】また、図１および図２に示すように、一方
の噴口１７の噴射方向には点火プラグあるいはグロープ
ラグなどの着火アシスト装置２０が配置されている。こ
の着火アシスト装置２０はメタノールを燃料として使用
しているためにその着火性を高めるものである。Further, as shown in FIGS. 1 and 2, an ignition assist device 20 such as a spark plug or a glow plug is arranged in the injection direction of the one injection port 17. The ignition assist device 20 enhances its ignitability because it uses methanol as a fuel.
【００１４】このようにニードル先端部１９を半円柱状
に形成すると、一方の噴口１７側のホール部１４の空間
容積が大きくなり、一方の噴口１７の噴霧Ｆ１は噴射初
期から多くなる。これに対し、他方の噴出口１８の噴霧
Ｆ２は噴射初期にはニードル先端部１９の抵抗を受けて
小さくなるが、噴射量が多くなりニードル１３のリフト
量が大きくなると噴射量を増大させることになる。When the needle tip 19 is formed in a semi-cylindrical shape in this way, the space volume of the hole portion 14 on the one injection port 17 side becomes large, and the spray F1 of the one injection port 17 increases from the initial stage of injection. On the other hand, the spray F2 at the other ejection port 18 becomes smaller due to the resistance of the needle tip portion 19 at the initial stage of the injection, but the injection amount increases when the injection amount increases and the lift amount of the needle 13 increases. Become.
【００１５】したがって、図１に示すように燃料噴射量
の少ない低負荷時には着火アシスト装置２０に噴霧Ｆ１
が集中し、着火最適混合気量を確保することができる。
このため、着火性が向上し、失火がなくなり、ＨＣなど
の排出ガスが改善されて燃費も向上する。また、図２に
示すように燃料噴射量の多い高負荷時には双方の噴口１
７，１８から均一に燃料Ｆ１，Ｆ２が噴射されるように
なり、高負荷時の空気利用率が向上し、ＣＯなどの排出
ガスが改善すると共に燃費などの性能、さらに排気温度
を低下させることができ耐久性が向上する。Therefore, as shown in FIG. 1, when the fuel injection amount is small and the load is low, the spray F1 is supplied to the ignition assist device 20.
Can be concentrated, and the optimum amount of air-fuel mixture for ignition can be secured.
Therefore, ignitability is improved, misfire is eliminated, exhaust gas such as HC is improved, and fuel consumption is also improved. Further, as shown in FIG. 2, when the fuel injection amount is large and the load is high, the injection holes 1 of both nozzles 1
Fuels F1 and F2 are evenly injected from Nos. 7 and 18, the air utilization rate at high load is improved, CO and other exhaust gases are improved, and performance such as fuel consumption and exhaust temperature are further lowered. The durability can be improved.
【００１６】[0016]
【発明の効果】以上要するに本発明によれば、ニードル
先端部を一方の噴口側を削除して半円柱状に形成すると
共にその削除した側の噴口の噴射方向に着火アシスト装
置を配置したので、燃料噴射量が変化しても着火アシス
ト装置に向けた噴射量の変化が小さくなり、高負荷から
低負荷までの着火性を向上できる。In summary, according to the present invention, the needle tip is formed in a semi-cylindrical shape by removing one injection port side, and the ignition assist device is arranged in the injection direction of the deleted injection port. Even if the fuel injection amount changes, the change in the injection amount toward the ignition assist device becomes small, and the ignitability from high load to low load can be improved.
【図１】低負荷時の燃料噴射状態を示す図である。FIG. 1 is a diagram showing a fuel injection state at a low load.
【図２】高負荷時の燃料噴射状態を示す図である。FIG. 2 is a diagram showing a fuel injection state under a high load.
【図３】ニードル先端部を示す拡大図である。FIG. 3 is an enlarged view showing a tip of a needle.
【図４】図３のＡ−Ａ線矢視図である。FIG. 4 is a view taken along the line AA of FIG.
【図５】従来の噴射弁を示す図である。FIG. 5 is a view showing a conventional injection valve.
【図６】従来の他の噴射弁を示す図である。FIG. 6 is a view showing another conventional injection valve.
１１ 燃料噴射弁 １７ 一方の噴口 １８ 他方の噴口 １９ ノズル先端部 ２０ 着火アシスト装置 11 Fuel Injection Valve 17 One Injection Port 18 The Other Injection Port 19 Nozzle Tip 20 Ignition Assist Device
Claims (1)
口に臨む側を削除して他方の噴口に臨む側を半円断面に
残存させた半円柱状に形成し、該削除側の一方の噴口の
噴射方向に着火アシスト装置を配置したことを特徴とす
る着火アシスト付ディーゼルエンジンの噴射弁。1. A needle tip of a fuel injection valve is formed in a semi-cylindrical shape in which the side facing one injection port is deleted and the side facing the other injection port is left in a semi-circular cross section. An injection valve for a diesel engine with ignition assist, characterized in that an ignition assist device is arranged in the injection direction of the injection port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7720892A JPH05280442A (en) | 1992-03-31 | 1992-03-31 | Injection valve of diesel engine equipped with ignition assisting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7720892A JPH05280442A (en) | 1992-03-31 | 1992-03-31 | Injection valve of diesel engine equipped with ignition assisting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05280442A true JPH05280442A (en) | 1993-10-26 |
Family
ID=13627414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7720892A Pending JPH05280442A (en) | 1992-03-31 | 1992-03-31 | Injection valve of diesel engine equipped with ignition assisting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05280442A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7185831B2 (en) | 2004-11-05 | 2007-03-06 | Ford Motor Company | Low pressure fuel injector nozzle |
-
1992
- 1992-03-31 JP JP7720892A patent/JPH05280442A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7185831B2 (en) | 2004-11-05 | 2007-03-06 | Ford Motor Company | Low pressure fuel injector nozzle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2580823B2 (en) | Stratified combustion internal combustion engine | |
| US5522357A (en) | Apparatus and method of fuel injection and ignition of internal combustion engine | |
| US7926463B2 (en) | Cylinder injection type spark ignition internal combustion engine | |
| KR100941193B1 (en) | Cylinder injection spark ignition type internal combustion engine | |
| JPS62121827A (en) | Spark assist diesel engine | |
| US4712525A (en) | Combustion chamber of internal combustion engine | |
| EP1026800A3 (en) | Directed jet spark plug | |
| JPH07116991B2 (en) | Subchamber type gas chamber subchamber structure | |
| JP2972064B2 (en) | Internal combustion engine | |
| JPH05280442A (en) | Injection valve of diesel engine equipped with ignition assisting device | |
| JPH086590B2 (en) | Combustion chamber of internal combustion engine | |
| JPH0610674A (en) | Fuel injection device of in-cylinder fuel injection type engine | |
| JP2629745B2 (en) | Spark assist diesel engine | |
| JP3150481B2 (en) | Spark ignition gas internal combustion engine | |
| FR2888284A3 (en) | Internal combustion engine for motor vehicle, has injector with nozzle, whose free end comprises secondary orifice for supplying fuel to primary orifices, where axis of secondary orifice is oriented towards end of preheater plug | |
| JP3867319B2 (en) | In-cylinder direct injection internal combustion engine | |
| JPS5812456B2 (en) | 2 cycle engine | |
| JPH0755295Y2 (en) | Combustion chamber of internal combustion engine | |
| JPS5840263Y2 (en) | internal combustion engine | |
| JPH0614034Y2 (en) | Internal combustion engine ignition device | |
| JPS5815637Y2 (en) | Combustion chamber structure of internal combustion engine with auxiliary combustion chamber | |
| JPS58128416A (en) | Direct injection type diesel engine | |
| JPH05256229A (en) | Fuel injection two-cycle engine | |
| JPH05133307A (en) | Laminar combustion type internal combustion engine | |
| JPS6290980U (en) |