EP1408231B1 - Injection device for fuel injection - Google Patents
Injection device for fuel injection Download PDFInfo
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- EP1408231B1 EP1408231B1 EP03103635A EP03103635A EP1408231B1 EP 1408231 B1 EP1408231 B1 EP 1408231B1 EP 03103635 A EP03103635 A EP 03103635A EP 03103635 A EP03103635 A EP 03103635A EP 1408231 B1 EP1408231 B1 EP 1408231B1
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- European Patent Office
- Prior art keywords
- tip
- injection
- nozzle needle
- nozzle
- needle
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- 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
- F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
Definitions
- the present invention relates to an injection device for injecting fuel, in particular in a combustion chamber of an internal combustion engine.
- Injection devices for injecting fuel into a combustion chamber of an internal combustion engine are known from the prior art in various configurations, in particular in connection with storage injection systems, such as common rail systems for injection of diesel fuel into a combustion chamber of an engine.
- Such injection devices comprise a nozzle needle guided in a nozzle body, wherein a sealing seat between the nozzle needle and the nozzle body is realized at a tip of the nozzle needle.
- Below the sealing seat in the discharge direction usually more injection holes are arranged, which branch off from a blind hole on the nozzle body and through which the fuel is injected into the combustion chamber.
- so-called micro-blind hole nozzles are known in which the space below the sealing seat, from which depart from the spray holes, is as small as possible.
- an injection nozzle in which the nozzle needle has an annular groove in the region of the transition between the blind hole and the nozzle needle.
- the annular groove is in the region of the injection or the injection holes.
- This injection device for injecting fuel comprises a nozzle needle, which is arranged in a nozzle body, and a microsack hole formed in the nozzle body, in which at least one injection hole is formed.
- the tip of the nozzle needle protrudes into the micro-blind hole in such a way that the tip is arranged in the axial direction of the nozzle needle at the level of the injection holes.
- At the top of the nozzle needle at the height of the injection holes are recesses formed in the tip to ensure a minimum distance between the tip and the spray holes.
- the injection device according to the invention for injecting fuel into a combustion chamber is designed such that a tip of a nozzle needle extends so deep into a micro-blind hole that the tip is arranged in the longitudinal direction of the nozzle needle at the height of the injection holes.
- the tip of the nozzle needle is formed at the height of the injection holes in such a way that it is shaped in this area deviating from a conical basic shape such that a sufficient distance between the spray holes and the nozzle needle is present.
- the minimum distance between the Spray holes and the nozzle needle tip both with a closed nozzle needle as well as a small needle lift available.
- the distance is formed such that a surface which lies in a plane perpendicular to the nozzle needle between the outer circumference of the tip of the nozzle needle and each inwardly directed to the blind hole edge point of the injection hole is equal to about 0.200 mm 2 .
- the tip is formed in the region near the injection hole in such a way that between the tip and the injection hole, an annular, area-like region with a cross-sectional area of 0.200 mm 2 is provided with non-actuated nozzle needle.
- the annular surface lies in a plane which is perpendicular to the direction of movement of the nozzle needle and extends through the uppermost edge point of the or the injection holes.
- a particularly good spray pattern is obtained when all spray holes of the injection device are arranged in a plane perpendicular to the direction of movement of the nozzle needle.
- the tip of the nozzle needle in the region which is opposite to the spray holes provided with a recess, which are formed for example as a circumferential groove in the conical tip of the nozzle needle.
- the recess may be formed, for example, by a, in particular stepped, paragraph in the tip of the nozzle needle in the region opposite the spray holes.
- the tip of the nozzle needle is designed such that in the area opposite the spray holes a second conical Area is formed.
- the angle of this second conical region to the central axis of the nozzle needle is greater than an angle of the tip of the nozzle needle, for example at a sealing seat of the needle.
- Such a second conical region can be produced in a particularly simple manner, for example by grinding the nozzle needle. It should also be noted that, of course, a plurality of conical regions can successively form the tip of the nozzle needle, wherein the angle with respect to the central axis of the needle becomes larger, the closer it is at the end of the tip.
- the present invention is particularly useful in storage injection systems, such as e.g. Common rail systems, used. According to the invention can thus be obtained despite the small blind hole volume, which usually leads to poor exhaust emissions, by the inventive design of the needle tip a good uniform distribution of Einstrahlmengen and a good jet pattern, resulting in low HC emissions. Thus, an improved mixture formation can be achieved in the combustion chamber, whereby a significant reduction of the exhaust emissions and also the consumption is obtained.
- the injection device comprises in a known manner arranged in a nozzle body 1 nozzle needle 2.
- the nozzle needle 2 is seated on a sealing seat 4 on the nozzle body 1 and gives the sealing seat, for example by driving by means of a piezoelectric actuator in a known manner by movement along the longitudinal axis XX of the nozzle needle 2 free or closes this to start an injection or to end.
- the nozzle needle 2 has a substantially conically formed tip 3.
- the tip 3 is formed by a first conical region 5, a second conical region 6 and a third conical region 7.
- the conical regions 5, 6, 7 are formed such that they each have a different angle to the longitudinal axis X-X.
- the first conical portion 5 has the most acute angle with respect to the axis X-X
- the third conical portion 7 located at the end of the tip 3 has the most obtuse angle with respect to the axis X-X (see Fig. 1).
- a plurality of spray holes 8, more precisely, as shown in Figure 2 six injection holes 8 are formed in a known manner in a known manner.
- the injection holes 8 lie on a plane perpendicular through the longitudinal axis X-X of the nozzle needle. 2
- the second conical region 6 lies opposite a top edge point 9 and the spray hole 8 when the nozzle needle 2 is closed and with a smaller needle stroke up to approximately 80 .mu.m. More precisely, the uppermost edge point 9 lies in a plane E which is perpendicular to the longitudinal axis XX of the nozzle needle 2 and the uppermost edge point 9 the injection hole 8 runs. This results between the uppermost edge point 9 and the tip 3 of the nozzle needle an annular surface A.
- the annular surface A is shown in detail in the sectional view along the plane E shown in FIG.
- the annular surface A has a size of equal to about 0.200 mm 2 .
- the tip 3 of the nozzle needle is formed in the region opposite to the injection hole 8 by an approximately parabolic tapered portion 11 in the second embodiment.
- This tapering region 11 of the tip 3 is designed such that between the uppermost edge point 9 of the injection hole 8 and the tapered portion 11, an area A with a cross section of about 0.200 mm 2 results.
- the tapered region can also be produced, for example, by means of grinding.
- the second embodiment corresponds to the first embodiment, so that reference can be made to the description given there.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die vorliegende Erfindung betrifft eine Einspritzvorrichtung zum Einspritzen von Kraftstoff, insbesondere in einem Brennraum einer Brennkraftmaschine.The present invention relates to an injection device for injecting fuel, in particular in a combustion chamber of an internal combustion engine.
Einspritzvorrichtungen zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine sind aus dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt, insbesondere in Verbindung mit Speichereinspritzsystemen, wie beispielsweise Common-Rail-Systemen zur Einspritzung von Dieselkraftstoff in einen Brennraum eines Motors. Derartige Einspritzvorrichtungen umfassen eine in einem Düsenkörper geführte Düsennadel, wobei an einer Spitze der Düsennadel ein Dichtsitz zwischen der Düsennadel und dem Düsenkörper realisiert ist. Unterhalb des Dichtsitzes in Austrittsrichtung sind dabei üblicherweise mehrere Spritzlöcher angeordnet, welche von einem Sackloch am Düsenkörper abzweigen und durch welche der Kraftstoff in den Brennraum eingespritzt wird. Hierbei sind auch sogenannte Mikro-Sacklochdüsen bekannt, bei denen der Raum unterhalb des Dichtsitzes, von welchem aus die Spritzlöcher abgehen, möglichst klein ist.Injection devices for injecting fuel into a combustion chamber of an internal combustion engine are known from the prior art in various configurations, in particular in connection with storage injection systems, such as common rail systems for injection of diesel fuel into a combustion chamber of an engine. Such injection devices comprise a nozzle needle guided in a nozzle body, wherein a sealing seat between the nozzle needle and the nozzle body is realized at a tip of the nozzle needle. Below the sealing seat in the discharge direction usually more injection holes are arranged, which branch off from a blind hole on the nozzle body and through which the fuel is injected into the combustion chamber. In this case, so-called micro-blind hole nozzles are known in which the space below the sealing seat, from which depart from the spray holes, is as small as possible.
Aus der DE 199 81 370 A1 ist eine Einspritzdüse bekannt, bei der die Düsennadel eine Ringnut im Bereich des Übergangs zwischen Sackloch und Düsennadel aufweist. Bei Sitzlocheinspritzdüsen befindet sich die Ringnut im Bereich des oder der Spritzlöcher. Diese Einspritzvorrichtung zum Einspritzen von Kraftstoff umfasst eine Düsennadel, welche in einem Düsenkörper angeordnet ist, und ein in dem Düsenkörper gebildetes Mikrosackloch, in welchem mindestens ein Spritzloch ausgebildet ist. Die Spitze der Düsennadel steht derart in das Mikrosackloch vor, dass die Spitze in axial Richtung der Düsennadel auf Höhe der Spritzlöcher angeordnet ist. An der Spitze der Düsennadel auf Höhe der Spritzlöcher sind Ausnehmungen in der Spitze gebildet, um einen Mindestabstand zwischen der Spitze und den Spritzlöchern sicherzustellen.From DE 199 81 370 A1 an injection nozzle is known in which the nozzle needle has an annular groove in the region of the transition between the blind hole and the nozzle needle. In seat hole injection nozzles, the annular groove is in the region of the injection or the injection holes. This injection device for injecting fuel comprises a nozzle needle, which is arranged in a nozzle body, and a microsack hole formed in the nozzle body, in which at least one injection hole is formed. The tip of the nozzle needle protrudes into the micro-blind hole in such a way that the tip is arranged in the axial direction of the nozzle needle at the level of the injection holes. At the top of the nozzle needle at the height of the injection holes are recesses formed in the tip to ensure a minimum distance between the tip and the spray holes.
Bei einem kleinen Nadelhub, beispielsweise für eine Voreinspritzung oder eine Nacheinspritzung, kann es jedoch bei einer Mikro-Sacklochdüse aufgrund des geringen Strömungsquerschnitts zwischen Nadel und Düsenkörper zu einer schlechten Gleichverteilung des Kraftstoffs und/oder zu einem schlechten Strahlbild kommen. Dies führt zu verschlechterten Verbrennungsvorgängen im Brennraum und somit zu schlechten Abgasemissionen des Motors. Von daher sind bei den bekannten Mikro-Sacklochdüsen die Gestaltungen des Sacklochs derart, dass ein Querschnitt vor dem Spritzloch groß genug gehalten werden muss, woraus jedoch auch ein größerer Querschnitt des Mikro-Sacklochs resultiert. Somit sind durch diese Gegebenheiten Verbesserungen der Abgasemissionen durch das relativ große Volumen des Mikro-Sacklochs enge Grenzen gesetzt.In the case of a small needle stroke, for example for a pre-injection or a post-injection, however, a poor uniform distribution of the fuel and / or a poor jet pattern can occur in the case of a micro blind-hole nozzle due to the small flow cross section between the needle and the nozzle body. This leads to deteriorated combustion processes in the combustion chamber and thus to poor exhaust emissions of the engine. Therefore, in the known micro-blind hole designs of the blind hole are such that a cross section in front of the injection hole must be kept large enough, but this also results in a larger cross section of the micro blind hole. Thus, by these circumstances Improvements in exhaust emissions due to the relatively large volume of the micro-blind hole narrow limits.
Es ist von daher Aufgabe der vorliegenden Erfindung, eine Einspritzvorrichtung mit einer Mikro-Sacklochdüse bereitzustellen, welche bei einfachem Aufbau und einfacher, kostengünstiger Herstellbarkeit ein verbessertes Emissionsverhalten der Abgase aufweist.It is therefore an object of the present invention to provide an injection device with a micro blind-hole nozzle, which has an improved emission behavior of the exhaust gases with a simple structure and simple, cost-effective manufacturability.
Diese Aufgabe wird durch eine Einspritzvorrichtung mit den Merkmalen des unabhängigen Anspruchs 1 gelöst. Die abhängigen Ansprüche zeigen vorteilhafte Weiterbildungen der Erfindung.This object is achieved by an injection device having the features of independent claim 1. The dependent claims show advantageous developments of the invention.
Die erfindungsgemäße Einspritzvorrichtung zum Einspritzen von Kraftstoff in einen Brennraum ist derart ausgebildet, dass eine Spitze einer Düsennadel so tief in ein Mikro-Sackloch reicht, dass die Spitze in Längsrichtung der Düsennadel auch auf Höhe der Spritzlöcher angeordnet ist. Dabei ist die Spitze der Düsennadel auf Höhe der Spritzlöcher derart ausgebildet, dass sie in diesem Bereich abweichend von einer konischen Grundform derart geformt ist, dass ein ausreichender Abstand zwischen den Spritzlöchern und der Düsennadel vorhanden ist. Durch diesen Mindestabstand kann sichergestellt werden, dass die Nadel immer einen ausreichenden Abstand von dem Einlass des Spritzlochs aufweist, sodass es zu einem guten Strahlbild und einer guten Gleichverteilung des Kraftstoffs vor Eintritt in die Spritzlöcher kommt. Dadurch werden signifikant verbesserte Abgasemissionen erhalten. Mit anderen Worten wird dieser Mindestabstand zwischen der Spitze und den Spritzlöchern dadurch erreicht, dass an der Spitze der Düsennadel auf Höhe der Spritzlöcher Ausnehmungen in der Spitze gebildet sind. Die Ausnehmungen können dabei in beliebiger geometrischer Gestalt ausgebildet sein.The injection device according to the invention for injecting fuel into a combustion chamber is designed such that a tip of a nozzle needle extends so deep into a micro-blind hole that the tip is arranged in the longitudinal direction of the nozzle needle at the height of the injection holes. In this case, the tip of the nozzle needle is formed at the height of the injection holes in such a way that it is shaped in this area deviating from a conical basic shape such that a sufficient distance between the spray holes and the nozzle needle is present. By this minimum distance can be ensured that the needle always has a sufficient distance from the inlet of the spray hole, so that it comes to a good spray pattern and a good uniform distribution of the fuel before entering the spray holes. As a result, significantly improved exhaust emissions are obtained. In other words, this minimum distance between the tip and the spray holes is achieved in that recesses are formed in the tip at the tip of the nozzle needle at the level of the injection holes. The recesses may be formed in any geometric shape.
Um auch bei kleinen Nadelhüben eine Verbesserung der Abgasemissionen zu erreichen, ist der Mindestabstand zwischen den Spritzlöchern und der Düsennadelspitze sowohl bei geschlossener Düsennadel als auch bei einem kleinen Nadelhub vorhanden.In order to achieve an improvement in exhaust emissions even with small needle strokes, the minimum distance between the Spray holes and the nozzle needle tip both with a closed nozzle needle as well as a small needle lift available.
Der Abstand ist derart ausgebildet, dass eine Fläche, welche in einer Ebene senkrecht zur Düsennadel liegt, zwischen dem äußeren Umfang der Spitze der Düsennadel und jedem nach innen zum Sackloch gerichteten Randpunkt des Spritzlochs gleich ca 0,200 mm2 ist. Mit anderen Worten ist die Spitze im Bereich nahe dem Spritzloch derart ausgebildet, dass zwischen der Spitze und dem Spritzloch ein ringförmiger, flächenartiger Bereich mit einer Querschnittsfläche von in 0,200 mm2 bei nichtbetätigter Düsennadel vorhanden ist.The distance is formed such that a surface which lies in a plane perpendicular to the nozzle needle between the outer circumference of the tip of the nozzle needle and each inwardly directed to the blind hole edge point of the injection hole is equal to about 0.200 mm 2 . In other words, the tip is formed in the region near the injection hole in such a way that between the tip and the injection hole, an annular, area-like region with a cross-sectional area of 0.200 mm 2 is provided with non-actuated nozzle needle.
Besonders bevorzugt liegt dabei die Ringfläche in einer Ebene, welche senkrecht zur Bewegungsrichtung der Düsennadel ist und durch den obersten Randpunkt des bzw. der Spritzlöcher verläuft.Particularly preferably, the annular surface lies in a plane which is perpendicular to the direction of movement of the nozzle needle and extends through the uppermost edge point of the or the injection holes.
Ein besonders gutes Strahlbild wird erhalten, wenn alle Spritzlöcher der Einspritzvorrichtung in einer Ebene senkrecht zur Bewegungsrichtung der Düsennadel angeordnet sind.A particularly good spray pattern is obtained when all spray holes of the injection device are arranged in a plane perpendicular to the direction of movement of the nozzle needle.
Vorzugsweise ist die Spitze der Düsennadel in dem Bereich, welche den Spritzlöchern entgegengesetzt liegt, mit einer Aussparung versehen, welche beispielsweise als umlaufende Nut in der kegelförmigen Spitze der Düsennadel ausgebildet sind. Alternativ hierzu kann die Aussparung beispielsweise durch einen, insbesondere stufenförmigen, Absatz in der Spitze der Düsennadel im Bereich gegenüber den Spritzlöchern ausgebildet sein.Preferably, the tip of the nozzle needle in the region which is opposite to the spray holes, provided with a recess, which are formed for example as a circumferential groove in the conical tip of the nozzle needle. Alternatively, the recess may be formed, for example, by a, in particular stepped, paragraph in the tip of the nozzle needle in the region opposite the spray holes.
Gemäß einer anderen bevorzugten Ausgestaltung der Erfindung ist die Spitze der Düsennadel derart ausgebildet, dass im Bereich gegenüber den Spritzlöchern ein zweiter kegelförmiger Bereich ausgebildet ist. Dabei ist der Winkel dieses zweiten kegelförmigen Bereichs zur Mittelachse der Düsennadel größer als ein Winkel der Spitze der Düsennadel, beispielsweise an einem Dichtsitz der Nadel. Ein derartiger zweiter kegelförmiger Bereich kann besonders einfach beispielsweise mittels Schleifen der Düsennadel hergestellt werden. Es sei weiterhin angemerkt, dass selbstverständlich auch mehrere kegelförmige Bereiche nacheinander die Spitze der Düsennadel bilden können, wobei der Winkel bezüglich der Mittelachse der Nadel immer größer wird, je näher er am Ende der Spitze liegt.According to another preferred embodiment of the invention, the tip of the nozzle needle is designed such that in the area opposite the spray holes a second conical Area is formed. In this case, the angle of this second conical region to the central axis of the nozzle needle is greater than an angle of the tip of the nozzle needle, for example at a sealing seat of the needle. Such a second conical region can be produced in a particularly simple manner, for example by grinding the nozzle needle. It should also be noted that, of course, a plurality of conical regions can successively form the tip of the nozzle needle, wherein the angle with respect to the central axis of the needle becomes larger, the closer it is at the end of the tip.
Die vorliegende Erfindung wird insbesondere bei Speichereinspritzsystemen, wie z.B. Common-Rail-Systemen, verwendet. Erfindungsgemäß kann somit trotz einem kleinen Sacklochvolumen, welches üblicherweise zu schlechten Abgasemissionen führt, durch die erfindungsgemäße Ausbildung der Nadelspitze eine gute Gleichverteilung der Einstrahlmengen und ein gutes Strahlbild erhalten werden, was zu geringen HC-Emissionen führt. Somit kann eine verbesserte Gemischausbildung im Brennraum erreicht werden, wodurch eine signifikante Absenkung der Abgasemissionen und auch des Verbrauchs erhalten wird.The present invention is particularly useful in storage injection systems, such as e.g. Common rail systems, used. According to the invention can thus be obtained despite the small blind hole volume, which usually leads to poor exhaust emissions, by the inventive design of the needle tip a good uniform distribution of Einstrahlmengen and a good jet pattern, resulting in low HC emissions. Thus, an improved mixture formation can be achieved in the combustion chamber, whereby a significant reduction of the exhaust emissions and also the consumption is obtained.
Nachfolgend wird die vorliegende Erfindung anhand von bevorzugten Ausführungsbeispielen in Verbindung mit der Zeichnung beschrieben. In der Zeichnung ist:
- Figur 1
- eine schematische Schnittansicht in einer Einspritzvorrichtung gemäß einem ersten Ausführungsbeispiel der vorliegenden Erfindung,
Figur 2- eine schematische Schnittansicht entlang der Linie II-II von Fig. 1,
- Figur 3
- eine schematische Schnittansicht einer Einspritzvorrichtung gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung.
- FIG. 1
- FIG. 2 is a schematic sectional view of an injection apparatus according to a first embodiment of the present invention; FIG.
- FIG. 2
- a schematic sectional view taken along the line II-II of Fig. 1,
- FIG. 3
- a schematic sectional view of an injection device according to a second embodiment of the present invention.
Nachfolgend wird unter Bezugnahme auf die Figuren 1 und 2 ein erstes Ausführungsbeispiel der vorliegenden Erfindung beschrieben.Hereinafter, a first embodiment of the present invention will be described with reference to Figs.
Wie in Figur 1 gezeigt, umfasst die Einspritzvorrichtung in bekannter Weise eine in einem Düsenkörper 1 angeordnete Düsennadel 2. Die Düsennadel 2 sitzt an einem Dichtsitz 4 am Düsenkörper 1 auf und gibt den Dichtsitz, beispielsweise durch Ansteuerung mittels eines Piezoaktors, in bekannter Weise durch Bewegung entlang der Längsachse X-X der Düsennadel 2 frei bzw. verschließt diesen, um eine Einspritzung zu beginnen bzw. zu beenden. Die Düsennadel 2 weist eine im Wesentlichen konisch gebildete Spitze 3 auf. Im vorliegenden Ausführungsbeispiel ist die Spitze 3 durch einen ersten kegelförmigen Bereich 5, einen zweiten kegelförmigen Bereich 6 und einen dritten kegelförmigen Bereich 7 gebildet. Dabei sind die kegelförmigen Bereiche 5, 6, 7 derart gebildet, dass sie jeweils einen unterschiedlichen Winkel zur Längsachse X-X aufweisen. Genauer weist der erste kegelförmige Bereich 5 den spitzesten Winkel gegenüber der Achse X-X auf und der am Ende der Spitze 3 angeordnete dritte kegelförmige Bereich 7 weist den stumpfesten Winkel gegenüber der Achse X-X auf (vgl. Figur 1).As shown in Figure 1, the injection device comprises in a known manner arranged in a nozzle body 1
Im Düsenkörper 1 sind in bekannter Weise eine Vielzahl von Spritzlöchern 8, genauer, wie in Figur 2 gezeigt, sechs Spritzlöcher 8 in symmetrischer Weise ausgebildet. Die Spritzlöcher 8 liegen dabei auf einer Ebene senkrecht durch die Längsachse X-X der Düsennadel 2.In the nozzle body 1, a plurality of
Wie aus Figur 1 ersichtlich ist, liegt dabei der zweite kegelförmige Bereich 6 bei geschlossener Düsennadel 2 und bei einem kleineren Nadelhub bis ca. 80 µm einem obersten Randpunkt 9 und des Spritzloches 8 gegenüber. Genauer liegt der oberste Randpunkt 9 in einer Ebene E, welche senkrecht zur Längsachse X-X der Düsennadel 2 und dem obersten Randpunkt 9 des Spritzlochs 8 verläuft. Dadurch ergibt sich zwischen dem obersten Randpunkt 9 und der Spitze 3 der Düsennadel eine ringförmige Fläche A.As can be seen from FIG. 1, the second
Die ringförmige Fläche A ist im Detail in der in Figur 2 gezeigten Schnittansicht entlang der Ebene E dargestellt. Die ringförmige Fläche A weist dabei eine Größe von gleich ca. 0,200 mm2 auf. Dadurch ist auch bei geschlossener Düsennadel ein gewisser Mindestabstand der Spitze 3, genauer des kegelförmigen Bereichs 6 der Spitze 3 vom Düsenkörper 1, sichergestellt. Dadurch kann vor den Spritzlöchern ein ausreichender Raum aufrecht erhalten werden. Somit kann auch bei einer wie in Figur 1 gezeigten Mikro-Sacklochdüse trotz des kleinen Sacklochvolumens eine gute Gleichverteilung der Einzelstrahlmengen und ein gutes Strahlbild bei der Einspritzung erreicht werden, wodurch die Abgasemissionen und der Kraftstoffverbrauch verringert werden.The annular surface A is shown in detail in the sectional view along the plane E shown in FIG. The annular surface A has a size of equal to about 0.200 mm 2 . As a result, even with the nozzle needle closed, a certain minimum distance of the tip 3, more precisely of the
Nachfolgend wird unter Bezugnahme auf Figur 3 eine Einspritzvorrichtung gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung beschrieben. Dabei sind gleiche bzw. funktional gleiche Teile mit den gleichen Bezugszeichen wie im ersten Ausführungsbeispiel bezeichnet.Hereinafter, an injection apparatus according to a second embodiment of the present invention will be described with reference to FIG. The same or functionally identical parts are denoted by the same reference numerals as in the first embodiment.
Im Unterschied zum ersten Ausführungsbeispiel ist beim zweiten Ausführungsbeispiel die Spitze 3 der Düsennadel im Bereich gegenüber dem Spritzloch 8 durch einen sich ungefähr parabelförmigen verjüngenden Bereich 11 gebildet. Dieser sich verjüngende Bereich 11 der Spitze 3 ist dabei derart ausgebildet, dass sich zwischen dem obersten Randpunkt 9 des Spritzlochs 8 und dem sich verjüngenden Bereich 11 eine Fläche A mit einem Querschnitt von ca. 0,200 mm2 ergibt.In contrast to the first embodiment, the tip 3 of the nozzle needle is formed in the region opposite to the
Somit ist auch bei geschlossener Düsennadel ein ausreichender Abstand zwischen der Spitze der Düsennadel und den Spritzlöchern 8 gegeben, sodass eine verbesserte Einspritzung und damit auch insbesondere ein verbessertes Abgasverhalten des Mo tors erreicht werden kann. Der sich verjüngende Bereich kann ebenfalls beispielsweise mittels Schleifen hergestellt werden.Thus, even with the nozzle needle closed, a sufficient distance between the tip of the nozzle needle and the spray holes 8 is given, so that an improved injection and thus in particular an improved exhaust behavior of Mo can be achieved. The tapered region can also be produced, for example, by means of grinding.
Ansonsten entspricht das zweite Ausführungsbeispiel dem ersten Ausführungsbeispiel, sodass auf die dort gegebene Beschreibung verwiesen werden kann.Otherwise, the second embodiment corresponds to the first embodiment, so that reference can be made to the description given there.
Die vorhergehende Beschreibung der Ausführungsbeispiele gemäß der vorliegenden Erfindung dient nur zu illustrativen Zwecken und nicht zum Zwecke der Beschränkung der Erfindung. Im Rahmen der Erfindung sind verschiedene Änderungen und Modifikationen möglich, ohne den Umfang der Erfindung sowie ihrer Äquivalente zu verlassen.The foregoing description of the embodiments according to the present invention is for illustrative purposes only, and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention without departing from the scope of the invention and its equivalents.
Claims (7)
- Injection device for injecting fuel, comprising a nozzle needle (2) which is arranged in a nozzle body (1) and a micro blind hole (10), formed in the nozzle body (1), in which at least one injection hole (8) is embodied, with one tip (3) of the nozzle needle (2) projecting into the micro blind hole (10) in such a way that the tip (3) is disposed in the axial direction (X-X) of the nozzle needle at the level of the injection holes (8), with recesses being formed in the tip at the tip (3) of the nozzle needle (2) at the level of the injection holes (8) in order to ensure a minimum distance between the tip (3) and the injection holes (8),
characterised in that the minimum distance is formed by an area (A) lying in a plane (E) arranged perpendicular to the axial direction (X-X), with the area (A) between the outer circumference of the tip (3) and all the inner edge points of the injection holes (8) being equal to approx. 0.200 mm2 when the nozzle needle is closed. - Injection device according to claim 1, characterised in that the plane (E) runs through the uppermost edge point (9) of the injection hole (8).
- Injection device according to one of the preceding claims, characterised in that all the injection holes are arranged in a plane which is perpendicular to the axial direction (X-X).
- Injection device according to one of the preceding claims, characterised in that the tip (3) of the nozzle needle has a recessed area (6; 11) at the level of the plane (E).
- Injection device according to claim 4, characterised in that the recessed area is embodied as a circumferential groove.
- Injection device according to claim 4, characterised in that the recessed area is embodied as an offset.
- Injection device according to one of the preceding claims, characterised in that the tip (3) of the nozzle needle has a cone-shaped area (6) at the level of the injection holes, with an angle between said cone-shaped area (6) and the axis (X-X) of the nozzle needle being greater than an angle of the tip (3) of the nozzle needle at a sealing fit (4) of the needle on the nozzle body (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10246693 | 2002-10-07 | ||
| DE10246693A DE10246693A1 (en) | 2002-10-07 | 2002-10-07 | Injector for injecting fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1408231A1 EP1408231A1 (en) | 2004-04-14 |
| EP1408231B1 true EP1408231B1 (en) | 2006-12-13 |
Family
ID=32010337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03103635A Expired - Lifetime EP1408231B1 (en) | 2002-10-07 | 2003-10-01 | Injection device for fuel injection |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7017840B2 (en) |
| EP (1) | EP1408231B1 (en) |
| JP (1) | JP2004132376A (en) |
| DE (2) | DE10246693A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005025135A1 (en) * | 2005-06-01 | 2006-12-07 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| US7360722B2 (en) * | 2005-08-25 | 2008-04-22 | Caterpillar Inc. | Fuel injector with grooved check member |
| US7578450B2 (en) * | 2005-08-25 | 2009-08-25 | Caterpillar Inc. | Fuel injector with grooved check member |
| EP2369166B1 (en) | 2010-03-22 | 2017-12-13 | Delphi International Operations Luxembourg S.à r.l. | Injection nozzle |
| JP2011256837A (en) * | 2010-06-11 | 2011-12-22 | Toyota Motor Corp | Fuel injection valve |
| DE102010032050B4 (en) * | 2010-07-23 | 2017-12-21 | Continental Automotive Gmbh | Nozzle body with blind hole |
| DE102011118299A1 (en) * | 2011-11-10 | 2013-05-16 | Daimler Ag | injection |
| JP6354519B2 (en) * | 2014-10-23 | 2018-07-11 | 株式会社デンソー | Fuel injection valve |
| JP6254122B2 (en) | 2015-06-24 | 2017-12-27 | 株式会社デンソー | Fuel injection nozzle |
| GB2552673B (en) * | 2016-08-02 | 2020-02-19 | Delphi Tech Ip Ltd | SCR doser spray atomization |
| DE102019210631A1 (en) * | 2019-07-18 | 2021-01-21 | Robert Bosch Gmbh | Fuel injector for internal combustion engines |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5882068A (en) * | 1981-11-09 | 1983-05-17 | Nissan Motor Co Ltd | Fuel injection nozzle |
| JP2819702B2 (en) * | 1989-12-12 | 1998-11-05 | 株式会社デンソー | Fuel injection valve |
| US5221046A (en) * | 1991-09-10 | 1993-06-22 | Diesel Technology Company | Methanol fueled diesel internal combustion engine fuel injector nozzle |
| GB9425652D0 (en) * | 1994-12-20 | 1995-02-22 | Lucas Ind Plc | Fuel injection nozzle |
| US5725157A (en) * | 1995-09-06 | 1998-03-10 | Buescher, Alfred J. | Injector nozzle valve |
| DE19547423B4 (en) | 1995-12-19 | 2008-09-18 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| DE19931891A1 (en) * | 1999-07-08 | 2001-01-18 | Siemens Ag | Fuel-injection valve for combustion engine |
| DE19942370A1 (en) * | 1999-09-04 | 2001-03-22 | Bosch Gmbh Robert | Injection nozzle for internal combustion engines with an annular groove in the nozzle needle |
| DE10000501A1 (en) * | 2000-01-08 | 2001-07-19 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
| DE10000574A1 (en) * | 2000-01-10 | 2001-07-19 | Bosch Gmbh Robert | Fuel injector |
| DE10002366A1 (en) | 2000-01-20 | 2001-08-02 | Siemens Ag | Fuel injection nozzle for internal combustion engine comprises nozzle body with shaft bore and tip area formed at combustion chamber-side end of nozzle body |
| IT1319988B1 (en) * | 2000-03-21 | 2003-11-12 | Fiat Ricerche | CLOSING PLUG OF A NOZZLE IN AN INTERNAL COMBUSTION FUEL INJECTOR. |
| DE10031264A1 (en) * | 2000-06-27 | 2002-01-17 | Bosch Gmbh Robert | Fuel injection valve for IC engines with even fuel supply to all injection openings even if valve member is misaligned |
| DE10031265A1 (en) * | 2000-06-27 | 2002-01-10 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
-
2002
- 2002-10-07 DE DE10246693A patent/DE10246693A1/en not_active Ceased
-
2003
- 2003-10-01 DE DE50305940T patent/DE50305940D1/en not_active Expired - Lifetime
- 2003-10-01 EP EP03103635A patent/EP1408231B1/en not_active Expired - Lifetime
- 2003-10-07 US US10/680,323 patent/US7017840B2/en not_active Expired - Lifetime
- 2003-10-07 JP JP2003348497A patent/JP2004132376A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20040112988A1 (en) | 2004-06-17 |
| US7017840B2 (en) | 2006-03-28 |
| DE50305940D1 (en) | 2007-01-25 |
| DE10246693A1 (en) | 2004-04-15 |
| EP1408231A1 (en) | 2004-04-14 |
| JP2004132376A (en) | 2004-04-30 |
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