JP3334472B2 - Fuel injection nozzle - Google Patents
Fuel injection nozzleInfo
- Publication number
- JP3334472B2 JP3334472B2 JP00932296A JP932296A JP3334472B2 JP 3334472 B2 JP3334472 B2 JP 3334472B2 JP 00932296 A JP00932296 A JP 00932296A JP 932296 A JP932296 A JP 932296A JP 3334472 B2 JP3334472 B2 JP 3334472B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- ejection hole
- main
- sub
- fuel 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.)
- Expired - Fee Related
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は、車両用ディーゼル
エンジンに用いられる燃料噴射ノズルに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection nozzle used for a vehicle diesel engine.
【0002】[0002]
【従来の技術】車両用ディーゼルエンジンに用いられる
燃料噴射ノズルは、ノズル本体の先端部に複数の燃料噴
出孔を有しており、これらの燃料噴出孔からディーゼル
エンジンの燃焼室に燃料を噴霧するように構成されてい
る。2. Description of the Related Art A fuel injection nozzle used in a diesel engine for a vehicle has a plurality of fuel injection holes at the tip of a nozzle body, and sprays fuel from these fuel injection holes into a combustion chamber of the diesel engine. It is configured as follows.
【0003】従って、このような燃料噴射ノズルは燃料
噴出孔の孔径によりディーゼルエンジンの性能が大きく
左右され、燃料噴出孔の孔径を小さくすると、ディーゼ
ルエンジンの燃焼室に粒子径の細かい燃料が噴霧される
ことになるので、空気と燃料が良く混合し、これにより
排煙の生成を抑制することができる。しかし、その反
面、噴出孔の数を増せば窒素酸化物が増大し、また噴出
孔の数を減らせば燃料の噴射期間が必要以上に長くな
り、燃料供給量の多い高負荷域で燃費が増大(悪化)す
る。Accordingly, the performance of a diesel engine of such a fuel injection nozzle is greatly affected by the diameter of the fuel injection hole. When the diameter of the fuel injection hole is reduced, fuel having a fine particle diameter is sprayed into the combustion chamber of the diesel engine. As a result, the air and the fuel are well mixed, thereby suppressing the generation of flue gas. However, on the other hand, increasing the number of orifices will increase nitrogen oxides, and reducing the number of orifices will lengthen the fuel injection period more than necessary, increasing fuel efficiency in high load areas with a large amount of fuel supply. (Getting worse.
【0004】そこで、このような問題を解決するため
に、ノズル本体の先端部に小径の燃料噴出孔と大径の燃
料噴出孔とを交互に配設した燃料噴射ノズルが考案され
ている(特開平6−307311号公報参照)。[0004] In order to solve such a problem, a fuel injection nozzle has been devised in which small-diameter fuel injection holes and large-diameter fuel injection holes are alternately arranged at the tip end of the nozzle body (particularly). See Japanese Unexamined Patent Publication No. Hei 6-307311).
【0005】このような燃料噴射ノズルによると、上述
した従来の燃料噴射ノズルのように燃料の噴射期間が必
要以上に長くなることがないので、燃費の増大は避けら
れるが、次のような問題を有していた。According to such a fuel injection nozzle, the fuel injection period does not become unnecessarily long unlike the above-mentioned conventional fuel injection nozzle, so that an increase in fuel consumption can be avoided. Had.
【0006】[0006]
【発明が解決しようとする課題】すなわち、上述した燃
料噴射ノズルでは、孔径の小さい燃料噴出孔から噴霧さ
れた燃料粒子は微細化するが、孔径の大きい燃料噴出孔
から噴霧された燃料粒子は微細化しないため、着火まで
の時間が長くなり、それぞれ独立して燃焼し、初期燃焼
量が大きくなって窒素酸化物が生成され易くなるととも
に、燃焼騒音が増大するという問題が生じていた。That is, in the above-described fuel injection nozzle, the fuel particles sprayed from the fuel ejection hole having a small diameter are finer, but the fuel particles sprayed from the fuel ejection hole having a large diameter are fine. Therefore, there is a problem that the time until ignition becomes longer, the fuel burns independently of each other, the initial combustion amount increases, nitrogen oxides are easily generated, and the combustion noise increases.
【0007】本発明は上記のような問題点に鑑みてなさ
れたもので、その目的は燃料供給量の多い高負荷域でも
燃料の噴射期間が必要以上に長くなることがなく、且つ
窒素酸化物の生成を抑制することができると共に燃焼騒
音の低減を図ることのできる燃料噴射ノズルを提供せん
とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent the fuel injection period from becoming unnecessarily long even in a high load region where a large amount of fuel is supplied. It is an object of the present invention to provide a fuel injection nozzle capable of suppressing generation of fuel and reducing combustion noise.
【0008】[0008]
【課題を解決するための手段】上記課題を解決するため
に、請求項1の発明は、ノズル本体の先端部に複数の燃
料噴出孔を有し、これらの燃料噴出孔からディーゼルエ
ンジンの燃焼室に燃料を噴霧する燃料噴射ノズルにおい
て、前記燃料噴出孔が、大径の主噴出孔と小径の副噴出
孔とからなり、前記主噴出孔はその中心軸線が前記ノズ
ル本体の中心を通る地点に設けられ、前記副噴出孔は該
主噴出孔から前記ノズル本体の周方向にずれた該主噴出
孔と近接した地点に前記主噴出孔と一対となる状態で設
けられ、前記副噴出孔からの燃料を火種として前記主噴
出孔からの燃料を着火させるべく、前記副噴出孔は、そ
の中心軸線が、当該副噴出孔と対となる前記主噴出孔の
中心軸線のうち、前記ノズル本体の中心を挟んで当該主
噴出孔が有る側とは反対側へ延びる中心軸線部分と交差
させて設けてあることを特徴とするものである。In order to solve the above-mentioned problems, the invention according to claim 1 has a plurality of fuel ejection holes at a tip end portion of a nozzle body, and the fuel ejection holes are provided from these fuel ejection holes. a fuel injection nozzle for spraying fuel into said fuel ejection hole, consists of a main ejection hole and the small diameter of the secondary ejection holes of a large diameter, the main jet holes is the its central axis nozzle
Provided at a point passing through the center of the reel body, said secondary fuel jets is the
The main jet that is displaced from the main jet in the circumferential direction of the nozzle body
At a point close to the hole, it is installed as a pair with the main ejection hole.
In order to ignite the fuel from the main orifice using the fuel from the sub orifice as an ignition source, the sub orifice is
The central axis of the main ejection hole is paired with the sub ejection hole.
Of the center axis, the main
Intersects with the central axis extending to the side opposite to the side where the vent is located
It is characterized by being provided .
【0009】請求項2の発明は、請求項1の発明におい
て、前記主噴出孔の中心軸線と前記副噴出孔の中心軸線
とが交差する角度を10°〜30°に設定したことを特
徴とするものである。請求項3の発明は、請求項1の発
明において、前記主噴出孔の孔径と前記副噴出孔の孔径
との比を0.3〜0.6に設定したことを特徴とするも
のである。According to a second aspect of the present invention, in the first aspect of the present invention, the angle at which the central axis of the main ejection hole intersects with the central axis of the sub ejection hole is set to 10 ° to 30 °. Is what you do. According to a third aspect of the present invention, in the first aspect, the ratio of the diameter of the main ejection hole to the diameter of the sub ejection hole is set to 0.3 to 0.6.
【0010】[0010]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態について説明する。図1は本発明の一実施形態
に係る燃料噴射ノズルの縦断面図であって、同図に示す
ように、燃料噴射ノズルのノズル本体1内にはニードル
弁2が収容されている。このニードル弁2はノズル本体
1の軸方向に所定距離だけ移動可能となっており、その
上端にはプレッシャロッド3の下端が当接している。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a fuel injection nozzle according to an embodiment of the present invention. As shown in FIG. 1, a needle valve 2 is accommodated in a nozzle body 1 of the fuel injection nozzle. The needle valve 2 is movable in the axial direction of the nozzle body 1 by a predetermined distance, and the lower end of the pressure rod 3 is in contact with the upper end thereof.
【0011】前記プレッシャロッド3はニードル弁2の
先端部(弁部)2aをノズル本体1に形成された弁座4
に押圧するためのものであり、ノズル本体1内に収容さ
れたプレッシャスプリング5,6より下方に付勢されて
いる。The pressure rod 3 has a tip portion (valve portion) 2a of the needle valve 2 and a valve seat 4 formed on the nozzle body 1.
And is urged downward from the pressure springs 5 and 6 housed in the nozzle body 1.
【0012】前記ノズル本体1は燃料噴射ポンプからの
高圧燃料をノズル本体1内に供給するための燃料供給口
7を有しており、この燃料供給口7からノズル本体1内
に高圧燃料が供給されると、高圧燃料の液圧によりニー
ドル弁2が上方に押し上げられ、ニードル弁2の先端部
2aが弁座4から離間するようになっている。そして、
ニードル弁2の先端部2aが弁座4から離間すると、ノ
ズル本体1の先端部1a内に高圧燃料が流入し、ノズル
本体1の先端部1aに設けられた複数の燃料噴出孔8…
(図2参照)からディーゼルエンジンの燃焼室に燃料が
噴霧されるようになっている。The nozzle body 1 has a fuel supply port 7 for supplying high-pressure fuel from a fuel injection pump into the nozzle body 1, and high-pressure fuel is supplied from the fuel supply port 7 into the nozzle body 1. Then, the needle valve 2 is pushed upward by the liquid pressure of the high-pressure fuel, and the tip 2 a of the needle valve 2 is separated from the valve seat 4. And
When the distal end portion 2a of the needle valve 2 is separated from the valve seat 4, high-pressure fuel flows into the distal end portion 1a of the nozzle main body 1, and a plurality of fuel ejection holes 8 provided in the distal end portion 1a of the nozzle main body 1.
(See FIG. 2), the fuel is sprayed into the combustion chamber of the diesel engine.
【0013】前記燃料噴出孔8(以下、主噴出孔と称す
る。)は図3に示すようにノズル本体1の周方向に等間
隔で穿設されており、これら各主噴出孔8…の近傍に
は、燃料副噴出孔9(以下、副噴出孔と称する。)がそ
れぞれ穿設されている。これらの副噴出孔9…は主噴出
孔8の孔径をd(=0.2mm〜0.4mm)とする
と、0.3×d〜0.6×dの孔径を有しており、その
中心軸線9aが主噴出孔8の中心軸線8aとθ=10°
〜30°の角度で交差している。As shown in FIG. 3, the fuel outlets 8 (hereinafter referred to as main outlets) are formed at equal intervals in the circumferential direction of the nozzle body 1, and the vicinity of each of the main outlets 8 is formed. Are provided with fuel sub-injection holes 9 (hereinafter referred to as sub-injection holes). These sub-ejection holes 9 have a diameter of 0.3 × d to 0.6 × d, where d is the diameter of the main ejection hole 8 (= 0.2 mm to 0.4 mm). The axis 9a is θ = 10 ° with the center axis 8a of the main ejection hole 8.
They cross at an angle of 30 °.
【0014】主噴出孔8はその中心軸線8aがノズル本
体1の中心Oを通る位置に穿設され、主噴出孔8の中心
軸線8aと副噴出孔9の中心軸線9aはノズル本体1の
中心Oから外れた位置で交差している。 The main ejection hole 8 is formed so that its center axis 8a passes through the center O of the nozzle body 1. The center axis 8a of the main ejection hole 8 and the center axis 9a of the sub-ejection hole 9 are aligned with the center of the nozzle body 1. It is intersect at a position deviated from O.
【0015】このような構成において、燃料供給口7か
らノズル本体1内に高圧燃料が供給されると、高圧燃料
の液圧によりニードル弁2が上方に押し上げられ、これ
によりニードル弁2の先端部2aが弁座4から離間す
る。そして、ニードル弁2の先端部2aが弁座4から離
間すると、ノズル本体1の先端部1a内に高圧燃料が流
入し、ノズル本体1の先端部1aに設けられた複数の主
噴出孔8…からディーゼルエンジンの燃焼室に燃料が噴
霧されるとともに、各主噴出孔8…の近傍に設けられた
副噴出孔9…からディーゼルエンジンの燃焼室に燃料が
噴霧される。In such a configuration, when high-pressure fuel is supplied from the fuel supply port 7 into the nozzle body 1, the needle valve 2 is pushed upward by the liquid pressure of the high-pressure fuel, whereby the tip of the needle valve 2 2 a is separated from the valve seat 4. When the distal end portion 2a of the needle valve 2 is separated from the valve seat 4, high-pressure fuel flows into the distal end portion 1a of the nozzle body 1 and a plurality of main ejection holes 8 provided in the distal end portion 1a of the nozzle body 1. The fuel is sprayed into the combustion chamber of the diesel engine from the sub-injection holes 9 provided near the main injection holes 8.
【0016】このとき、副噴出孔9…からディーゼルエ
ンジンの燃焼室に噴霧された燃料粒子は、その粒子径が
主噴出孔8…からディーゼルエンジンの燃焼室に噴霧さ
れた燃料粒子の粒子径に比べて微細となっているので、
主噴出孔8…からディーゼルエンジンの燃焼室に噴霧さ
れた燃料粒子よりも先に着火する。これにより副噴出孔
9…から噴霧された燃料粒子は主噴出孔8…から噴霧さ
れた燃料粒子の近傍に燃焼炎を形成し、これが火種とな
って主噴出孔8…から噴霧された燃料粒子が着火するこ
とになる。At this time, the fuel particles sprayed from the sub-injection holes 9 into the combustion chamber of the diesel engine have a particle diameter that is reduced to the particle diameter of the fuel particles sprayed from the main injection holes 8 into the combustion chamber of the diesel engine. Because it is finer than
The fuel is ignited before the fuel particles sprayed from the main ejection holes 8 into the combustion chamber of the diesel engine. As a result, the fuel particles sprayed from the sub-jet holes 9 form a combustion flame near the fuel particles sprayed from the main jet holes 8. This becomes the kind of fire and the fuel particles sprayed from the main jet holes 8. Will ignite.
【0017】従って、本発明の一実施形態では着火まで
の時間を早めることができ、これにより初期燃焼量が大
きくなるようなことがないので、窒素酸化物の生成や燃
焼騒音の増大を抑制することができる。また、本発明の
一実施形態では主噴出孔8および副噴出孔9の両方から
燃料が噴霧されるので、燃料供給量の多い高負荷域であ
っても燃料の噴射期間が必要以上に長くなることもな
い。Therefore, in one embodiment of the present invention, the time until ignition can be shortened, and the initial combustion amount does not increase, thereby suppressing the generation of nitrogen oxides and the increase in combustion noise. be able to. Further, in one embodiment of the present invention, since the fuel is sprayed from both the main ejection hole 8 and the sub-ejection hole 9, the fuel injection period becomes longer than necessary even in a high load region where the fuel supply amount is large. Not even.
【0018】図4は主噴出孔8の中心軸線8aと副噴出
孔9の中心軸線9aとが交差する角度θを10°、20
°および30°に設定した時の窒素酸化物(NOx)の
発生量と燃費(be)との関係を示す線図であり、同図
に示すように、主噴出孔8の中心軸線8aと副噴出孔9
の中心軸線9aとが交差する角度θをθ=10°に設定
すると、窒素酸化物の発生量が最も少なくなるが、燃費
の点で不利となる。また、角度θをθ=30°に設定す
ると、θ=10°の時に比べて燃費が向上するが、窒素
酸化物の発生量が多くなる。従って、燃費を考慮する
と、主噴出孔8の中心軸線8aと副噴出孔9の中心軸線
9aとが交差する角度θをθ=10°〜30°に設定す
るのが好ましい。FIG. 4 shows that the angle θ at which the center axis 8a of the main ejection hole 8 and the center axis 9a of the sub ejection hole 9 intersect is 10 °, 20 °.
FIG. 5 is a diagram showing the relationship between the generation amount of nitrogen oxides (NOx) and fuel consumption (be) when the angle is set to 0 ° and 30 °, and as shown in FIG. Orifice 9
Is set at θ = 10 °, the generation amount of nitrogen oxides is minimized, but disadvantageous in terms of fuel efficiency. When the angle θ is set to θ = 30 °, fuel efficiency is improved as compared with the case where θ = 10 °, but the amount of generated nitrogen oxides is increased. Therefore, in consideration of fuel efficiency, it is preferable to set the angle θ at which the center axis 8a of the main ejection hole 8 intersects with the center axis 9a of the sub ejection hole 9 to θ = 10 ° to 30 °.
【0019】図5および図6は主噴出孔8と副噴出孔9
との孔径比を0.27、0.4および0.67に設定し
た時の窒素酸化物の発生量と燃費および排出ガス(R)
の関係を示す線図であり、図中の白丸で示すものは主噴
出孔8からのみ燃料を噴霧した時の実験結果を示し、図
中の黒四角で示すものは主噴出孔8と副噴出孔9との孔
径比を0.27に設定した時の実験結果を示している。
また、図中の黒丸で示すものは主噴出孔8と副噴出孔9
との孔径比を0.4に設定した時の実験結果を示し、図
中の黒三角で示すものは主噴出孔8と副噴出孔9との孔
径比を0.67に設定した時の実験結果を示している。
図5および図6から明らかなように、主噴出孔8と副噴
出孔9との孔径比を0.67に設定すると、主噴出孔8
と副噴出孔9との孔径比を0.27および0.4に設定
した時に比べて燃費(be)が悪化すると共に排出ガス
(排煙)が増大する。従って、燃費および排出ガスを考
慮すると、主噴出孔8と副噴出孔9との孔径比を0.3
〜0.6に設定するのが好ましい。FIGS. 5 and 6 show the main ejection port 8 and the sub ejection port 9.
Of Nitrogen Oxide, Fuel Efficiency and Exhaust Gas (R) when the Pore Size Ratio with
In the figure, the white circles in the figure show the experimental results when fuel was sprayed only from the main ejection holes 8, and the black squares in the figure show the results from the main ejection holes 8 and the sub-ejections. The experimental result when the hole diameter ratio with the hole 9 is set to 0.27 is shown.
The black circles in the figure indicate the main ejection holes 8 and the sub ejection holes 9.
The experimental results when the hole diameter ratio between the main ejection holes 8 and the sub ejection holes 9 are set to 0.67 are shown by black triangles in the figure. The results are shown.
As is clear from FIGS. 5 and 6, when the hole diameter ratio between the main ejection hole 8 and the sub ejection hole 9 is set to 0.67, the main ejection hole 8
The fuel consumption (be) is deteriorated and the exhaust gas (smoke emission) is increased as compared with the case where the hole diameter ratio of the gas and the sub-injection hole 9 is set to 0.27 and 0.4. Therefore, in consideration of fuel efficiency and exhaust gas, the hole diameter ratio between the main ejection hole 8 and the sub ejection hole 9 is set to 0.3.
Preferably, it is set to 0.6.
【0020】図7は燃料噴出孔8の中心軸線8aと燃料
副噴出孔9の中心軸線9aとが交差する角度θを10
°、15°、20°、30°にそれぞれ設定した時の燃
焼騒音を示す線図であり、同図からも明らかなように、
燃料噴出孔8の中心軸線8aと燃料副噴出孔9の中心軸
線9aとが交差する角度θを10°〜30°に設定する
ことにより、燃料噴出孔8からのみ燃料を噴霧した時に
比べて燃焼騒音が低減する。FIG. 7 shows that the angle θ at which the central axis 8a of the fuel ejection hole 8 and the central axis 9a of the fuel sub-ejection hole 9 intersect is 10 degrees.
°, 15 °, 20 °, is a diagram showing the combustion noise when set to 30 °, respectively, as is clear from the figure,
By setting the angle θ at which the central axis 8a of the fuel ejection hole 8 intersects with the central axis 9a of the fuel sub-ejection hole 9 to 10 ° to 30 °, combustion is performed as compared to when fuel is sprayed only from the fuel ejection hole 8. Noise is reduced.
【0021】従って、本発明の一実施形態では燃料の噴
射期間が必要以上に長くなることがなく、且つ窒素酸化
物の生成を抑制できると共に燃焼騒音の低減を図ること
ができる。Accordingly, in one embodiment of the present invention, the fuel injection period does not become unnecessarily long, the generation of nitrogen oxides can be suppressed, and the combustion noise can be reduced.
【0022】また、本発明の一実施形態では燃料噴出孔
8の中心軸線8aと燃料副噴出孔9の中心軸線9aとを
ノズル本体1の中心Oから外れた位置で交差させること
により、燃料副噴出孔9をレーザ加工で穿設する時に発
生する溶融母材による悪影響を防止することもできる。Further, in one embodiment of the present invention, the center axis 8a of the fuel ejection hole 8 and the center axis 9a of the fuel sub-ejection hole 9 intersect at a position deviated from the center O of the nozzle body 1, so that the fuel It is also possible to prevent adverse effects due to the molten base material generated when the ejection holes 9 are formed by laser processing.
【0023】なお、上述した本発明の一実施形態では燃
料副噴出孔9を燃料噴出孔8と同一の水平面上に設けた
が、燃料副噴出孔9を燃料噴出孔8の上部近傍若しくは
下部近傍に設けても同様の効果を得ることができる。In the above-described embodiment of the present invention, the fuel sub-ejection hole 9 is provided on the same horizontal plane as the fuel ejection hole 8, but the fuel sub-ejection hole 9 is located near the upper portion or the lower portion of the fuel ejection hole 8. , The same effect can be obtained.
【0024】[0024]
【発明の効果】以上説明したように、請求項1の発明に
よれば、径の小さい副噴出孔から噴射された微細粒子が
先に燃焼して火種となるとともに、主噴出孔と副噴出孔
を近接させたので、火種の火炎によって主噴出孔から噴
射された燃料の着火性が良好となり、結果的に窒素酸化
物の生成が抑制されるとともに燃焼騒音の低減が図れ
る。また、主噴出孔の中心軸線と副噴出孔の中心軸線と
をノズル本体の内方で交差させたので、副噴出孔からの
燃料噴射が主噴出孔からの燃料噴射を妨げることがな
く、燃焼室内の空気が有効に利用されることにより排煙
の低減が図れる。As described above, according to the first aspect of the present invention, the fine particles ejected from the small-diameter sub-ejection hole first burn and become a fire, and the main ejection hole and the sub-ejection hole are formed. Are brought close to each other, so that the ignitability of the fuel injected from the main ejection hole by the flame of the fire is improved, and as a result, the generation of nitrogen oxides is suppressed and the combustion noise can be reduced. In addition, since the central axis of the main ejection hole and the central axis of the sub ejection hole intersect inside the nozzle body, fuel injection from the sub ejection hole does not hinder fuel injection from the main ejection hole. Smoke emission can be reduced by effectively using indoor air.
【0025】請求項2の発明によれば、上述した効果を
顕著に得ることができ、窒素酸化物の生成をより抑制で
きると共に燃焼騒音の低減を図ることができる。請求項
3の発明によれば、主噴出孔の孔径と副噴出孔の孔径と
の比を0.3〜0.6に設定したことにより、窒素酸化
物の生成をより確実に抑制できると共に燃焼騒音の低減
をより確実に図ることができる。According to the second aspect of the present invention, the above-mentioned effects can be obtained remarkably, the generation of nitrogen oxides can be further suppressed, and the combustion noise can be reduced. According to the third aspect of the invention, by setting the ratio of the diameter of the main ejection hole to the diameter of the sub-ejection hole to 0.3 to 0.6, it is possible to more reliably suppress the generation of nitrogen oxides and combust. Noise can be more reliably reduced.
【図1】本発明の一実施形態に係る燃料噴射ノズルの縦
断面図。FIG. 1 is a longitudinal sectional view of a fuel injection nozzle according to one embodiment of the present invention.
【図2】図1に示すA部の詳細図。FIG. 2 is a detailed view of a portion A shown in FIG.
【図3】図2のB−B線に沿った断面図。FIG. 3 is a sectional view taken along the line BB of FIG. 2;
【図4】主噴出孔の中心軸線と副噴出孔の中心軸線とが
交差する角度を10°、20°および30°に設定した
時の実験結果を示す線図。FIG. 4 is a diagram showing experimental results when the angles at which the central axis of the main ejection port and the central axis of the sub ejection port intersect are set to 10 °, 20 °, and 30 °.
【図5】主噴出孔と副噴出孔との孔径比を0.27に設
定した時の実験結果を示す線図。FIG. 5 is a diagram showing experimental results when a hole diameter ratio between a main ejection hole and a sub ejection hole is set to 0.27.
【図6】主噴出孔と副噴出孔との孔径比を0.4および
0.67に設定した時の実験結果を示す線図。FIG. 6 is a diagram showing experimental results when the hole diameter ratio between the main ejection hole and the sub ejection hole is set to 0.4 and 0.67.
【図7】主噴出孔の中心軸線と副噴出孔の中心軸線とが
交差する角度を10°、20°および30°に設定した
時の燃焼騒音を示す線図。FIG. 7 is a diagram showing combustion noise when the angles at which the center axis of the main ejection hole and the center axis of the sub ejection hole intersect are set to 10 °, 20 °, and 30 °.
1…ノズル本体 2…ニードル弁 3…プレッシャロッド 4…弁座 5,6…プレッシャスプリング 7…燃料注入口 8…主噴出孔 9…副噴出孔 DESCRIPTION OF SYMBOLS 1 ... Nozzle body 2 ... Needle valve 3 ... Pressure rod 4 ... Valve seat 5, 6 ... Pressure spring 7 ... Fuel injection port 8 ... Main ejection hole 9 ... Sub ejection hole
───────────────────────────────────────────────────── フロントページの続き 審査官 岩瀬 昌治 (56)参考文献 特開 平7−208303(JP,A) (58)調査した分野(Int.Cl.7,DB名) F02M 61/18 320 ────────────────────────────────────────────────── ─── Continued on the front page Examiner Shoji Iwase (56) References JP-A-7-208303 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) F02M 61/18 320
Claims (3)
を有し、これらの燃料噴出孔からディーゼルエンジンの
燃焼室に燃料を噴霧する燃料噴射ノズルにおいて、 前記燃料噴出孔が、大径の主噴出孔と小径の副噴出孔と
からなり、前記主噴出孔はその中心軸線が前記ノズル本
体の中心を通る地点に設けられ、前記副噴出孔は該主噴
出孔から前記ノズル本体の周方向にずれた該主噴出孔と
近接した地点に前記主噴出孔と一対となる状態で設けら
れ、前記副噴出孔からの燃料を火種として前記主噴出孔
からの燃料を着火させるべく、前記副噴出孔は、その中
心軸線が、当該副噴出孔と対となる前記主噴出孔の中心
軸線のうち、前記ノズル本体の中心を挟んで当該主噴出
孔が有る側とは反対側へ延びる中心軸線部分と交差させ
て設けてあることを特徴とする燃料噴射ノズル。1. A fuel injection nozzle having a plurality of fuel ejection holes at a tip end of a nozzle body and spraying fuel from these fuel ejection holes into a combustion chamber of a diesel engine, wherein the fuel ejection hole has a large diameter. It consists of a main ejection hole and the small diameter of the secondary fuel jets, said main ejection hole has its central axis the nozzle present
Provided at a point passing through the center of the body, the secondary fuel jets are main injection
The main ejection hole which is displaced from the ejection hole in the circumferential direction of the nozzle body;
At a point close to the main outlet, a pair is provided.
In order to ignite the fuel from the main orifice with the fuel from the sub orifice as a fire, the sub orifice is formed therein.
The center axis of the main outlet is paired with the sub outlet.
Of the axis, the main jets sandwich the center of the nozzle body.
Cross the center axis extending to the opposite side of the hole
A fuel injection nozzle characterized in that it is provided with a fuel injection nozzle.
の中心軸線とが交差する角度を10°〜30°に設定し
たことを特徴とする請求項1記載の燃料噴射ノズル。2. The fuel injection nozzle according to claim 1, wherein an angle at which a center axis of the main ejection hole and a center axis of the sub ejection hole intersect is set to 10 ° to 30 °.
径との比を0.3〜0.6に設定したことを特徴とする
請求項1記載の燃料噴射ノズル。3. The fuel injection nozzle according to claim 1, wherein a ratio of a diameter of the main ejection hole to a diameter of the sub ejection hole is set to 0.3 to 0.6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP00932296A JP3334472B2 (en) | 1996-01-23 | 1996-01-23 | Fuel injection nozzle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP00932296A JP3334472B2 (en) | 1996-01-23 | 1996-01-23 | Fuel injection nozzle |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09195893A JPH09195893A (en) | 1997-07-29 |
JP3334472B2 true JP3334472B2 (en) | 2002-10-15 |
Family
ID=11717244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP00932296A Expired - Fee Related JP3334472B2 (en) | 1996-01-23 | 1996-01-23 | Fuel injection nozzle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3334472B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001165017A (en) * | 1998-12-14 | 2001-06-19 | Denso Corp | Fuel injection nozzle |
DE10354467A1 (en) * | 2003-11-21 | 2005-06-09 | Robert Bosch Gmbh | Fuel injector |
JP6154362B2 (en) * | 2014-10-20 | 2017-06-28 | 株式会社Soken | Fuel injection nozzle |
JP2019065776A (en) * | 2017-10-02 | 2019-04-25 | いすゞ自動車株式会社 | Fuel injection nozzle for internal combustion engine, and internal combustion engine |
-
1996
- 1996-01-23 JP JP00932296A patent/JP3334472B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH09195893A (en) | 1997-07-29 |
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