WO2017005556A1 - Injection nozzle for a fuel injection system - Google Patents
Injection nozzle for a fuel injection system Download PDFInfo
- Publication number
- WO2017005556A1 WO2017005556A1 PCT/EP2016/065053 EP2016065053W WO2017005556A1 WO 2017005556 A1 WO2017005556 A1 WO 2017005556A1 EP 2016065053 W EP2016065053 W EP 2016065053W WO 2017005556 A1 WO2017005556 A1 WO 2017005556A1
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- WIPO (PCT)
- Prior art keywords
- nozzle
- nozzle needle
- injection
- needle
- fuel
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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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
- F02M51/0675—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
- F02M51/0678—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
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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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/001—Control chambers formed by movable sleeves
Definitions
- the invention relates to an injection nozzle for a fuel injection system, can be introduced with the fuel under high pressure in a combustion chamber of an internal combustion engine.
- the invention is based on an injection nozzle for fuel injection systems, as known for example from the document DE 102 37 003 AI.
- a fuel injection valve has a nozzle body, in which a piston-shaped nozzle needle is arranged longitudinally displaceable, which cooperates by its longitudinal movement with a nozzle seat and thus opens and closes one or more injection openings.
- the nozzle needle is arranged in a pressure chamber within the nozzle body, which is filled with fuel under high pressure when the fuel injection valve, the part of which is the injection nozzle, in operation.
- the control of the longitudinal movement of the nozzle needle takes place by the variation of the pressure in a control chamber, the pressure applied to the nozzle seat facing away from the nozzle needle with fuel pressure, wherein the pressure in the control chamber by means of a control valve is adjustable. If the pressure in the control chamber decreases, the hydraulic closing force on the nozzle needle also drops, and the nozzle needle is lifted off the nozzle seat by the fuel pressure in the pressure chamber and releases the injection openings. To close the nozzle needle, the fuel pressure in the control chamber is raised again so that the nozzle needle moves back into contact with the nozzle seat and closes the injection openings.
- the movement of the nozzle needle should be done as quickly as possible in order to realize several, very quickly successive injections.
- the nozzle needle on the one hand must have the lowest possible mass to react accordingly fast to the changing hydraulic pressures with a corresponding longitudinal movement.
- the nozzle needle but also have a high stability, since the attacking hydraulic forces are very high and the requirements for the mechanical stability of the nozzle needle accordingly.
- the injection nozzle according to the invention for a fuel injection system has the advantage that the nozzle needle has a mechanical stability which is almost identical to the solid design, but a significantly lower one
- the injection nozzle on a nozzle body with a fillable with fuel at high pressure pressure chamber in which a piston-shaped, a longitudinal axis having nozzle needle is arranged longitudinally displaceable.
- the nozzle needle cooperates with a nozzle seat for opening and closing at least one injection opening, wherein a slot-shaped recess is formed in the nozzle needle, which starting from the surface of the nozzle needle comprises at least part of the volume of the nozzle needle through which the longitudinal axis passes.
- the slot-shaped recess which comprises the volume of the nozzle needle, in which the longitudinal axis extends
- the outer structures of the nozzle needle remain virtually unchanged, so that the same or almost the same bending stability of the nozzle needle is achieved as in a solid version.
- the weight of the nozzle needle is significantly reduced, which allows shorter switching times and thus in particular injections that follow each other very quickly, such as it is necessary for pre- and post-injections in modern, high-speed internal combustion engines.
- a plurality of slot-shaped recesses are formed in the nozzle needle.
- material can be very effectively removed from the nozzle needle, without the stability, in particular the bending stability, being substantially impaired.
- the slot-shaped recesses penetrate the nozzle needle, so they extend from one surface of the nozzle needle to the other, they can be particularly well and inexpensively.
- the recesses penetrate such that viewed in the cross section of the nozzle needle, a cross-shaped recess is formed.
- At least two of the recesses are formed offset from one another in the longitudinal direction of the nozzle needle. In this way, material can be removed over the entire length of the nozzle needle, which is particularly advantageous in so-called long needles, as used in leak-free fuel injection systems.
- FIG. 1 shows a longitudinal section through an injection nozzle according to the invention, wherein only the essential parts are shown,
- FIG. 2 a shows a cross section through the illustrated nozzle needle of FIG
- FIG. 2b shows a cross section through the nozzle needle of FIG. 2 along the line BB
- FIG. 3 shows a further exemplary embodiment of a nozzle needle according to the invention
- FIG. 4 shows a cross section through the nozzle needle of FIG. 3 along the line
- FIG. 1 shows an injection nozzle according to the invention, as used in fuel injection systems with which fuel can be injected under high pressure into combustion chambers of internal combustion engines.
- the injection nozzle shown in Figure 1 has a nozzle body 2, in which a pressure chamber 4 is formed, which can be filled with fuel under high pressure.
- the nozzle body 2 In the installed position in an internal combustion engine, the nozzle body 2 forms part of a fuel injector which has the connection for the supply of the fuel under high pressure.
- a piston-shaped nozzle needle 5 is arranged longitudinally displaceable, which has a longitudinal axis 11 and at its combustion chamber end forms a sealing surface 7, with which the nozzle needle 5 cooperates with a nozzle seat 8, which - as well as the sealing surface 7 - essentially a conical Form has.
- the nozzle needle 5 With its end facing away from the nozzle seat 8, the nozzle needle 5 is guided in a sleeve 12, wherein between the sleeve 12 and a support ring 15 which is supported on a shoulder 16 of the nozzle needle 5, a helical compression spring 14 is arranged under pressure bias, by their bias voltages on the one hand the Nozzle needle 5 is pressed against the nozzle seat 8 and on the other hand, the sleeve 12 against a throttle plate, not shown in the figure 1.
- a control chamber 13 is limited, in which a likewise not shown in the drawing control valve, an alternating fuel pressure is adjustable.
- a plurality of slot-shaped recesses 20 are provided, as shown in the figure 2 again enlarged, showing the nozzle needle 5 without the associated nozzle body 5.
- two slot-shaped recesses 20 are provided, which intersect in the longitudinal axis 11, so that a cross-shaped recess 20 can be seen in cross-section in the nozzle needle 5, as shown in Figure 2a, where a cross-section through the nozzle needle 5 is shown along the line AA.
- the material is removed mainly in the interior of the nozzle needle 5, ie in the region through which the longitudinal axis 11 extends, so that although a large weight saving of the nozzle needle 5 results, but the bending stiffness of the nozzle needle 5 barely is impaired, since the flexural rigidity of the nozzle needle 5 is essentially determined by the outer structures of the nozzle needle 5, which are largely intact.
- the so-called guide portion with which the nozzle needle 5 is guided within the pressure chamber 4, three slot-shaped recesses 20 'are provided, which extends at an angle of 120 ° in the region of the longitudinal axis 11, so that a Y-shaped cavity in the nozzle needle 5 is formed in cross-section, as shown in Figure 2b in a cross section of the nozzle needle 5 along the line BB.
- the arrangement of three slot-shaped recesses 20 ' is advantageous, leave the correspondingly large areas on the nozzle needle 5 and a secure guidance of Nozzle needle 5 in the pressure chamber 4 contribute.
- FIG. 3 shows a further exemplary embodiment of a nozzle needle 5 'according to the invention.
- nozzle needle 5 ' are also a plurality of slot-shaped recesses 20 are provided, which also penetrate one another, as shown in Figure 2a already shown, but they are also arranged offset in the longitudinal direction of the nozzle needle 5', so that a weight saving over the entire length of the nozzle needle 5 'is possible.
- a nozzle needle 5 ' as shown in Figure 3, for example, used in injectors that use a so-called long needle, so operate leak-free.
- FIG. 4 shows a cross section through the nozzle needle 5 'of FIG. 3 along the line IV-IV.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Beschreibung description
Titel title
Einspritzdüse für ein Kraftstoffeinspritzsystem Injection nozzle for a fuel injection system
Offenbarung der Erfindung Disclosure of the invention
Die Erfindung betrifft eine Einspritzdüse für ein Kraftstoffeinspritzsystem, mit der Kraftstoff unter hohem Druck in einen Brennraum einer Brennkraftmaschine eingebracht werden kann. The invention relates to an injection nozzle for a fuel injection system, can be introduced with the fuel under high pressure in a combustion chamber of an internal combustion engine.
Stand der Technik State of the art
Die Erfindung geht von einer Einspritzdüse für Kraftstoffeinspritzsysteme aus, wie sie beispielweise aus der Schrift DE 102 37 003 AI bekannt ist. Ein solches Kraftstoffeinspritzventil weist einen Düsenkörper auf, in dem eine kolbenförmige Düsennadel längsverschiebbar angeordnet ist, die durch ihre Längsbewegung mit einem Düsensitz zusammenwirkt und damit eine oder mehrere Einspritzöffnungen öffnet und schließt. Die Düsennadel ist dabei in einem Druckraum innerhalb des Düsenkörpers angeordnet, der mit Kraftstoff unter hohem Druck befüllt ist, wenn das Kraftstoffeinspritzventil, dessen Teil die Einspritzdüse ist, in Betrieb ist. Die Steuerung der Längsbewegung der Düsennadel erfolgt dabei durch die Variation des Drucks in einem Steuerraum, der das düsensitzabgewandte Ende der Düsennadel mit Kraftstoff druck beaufschlagt, wobei der Druck im Steuerraum mittels eines Steuerventils einstellbar ist. Sinkt der Druck im Steuerraum, so sinkt ebenfalls die hydraulische Schließkraft auf die Düsennadel, und die Düsennadel wird durch den Kraftstoff druck im Druckraum vom Düsensitz abgehoben und gibt die Einspritzöffnungen frei. Zum Verschließen der Düsennadel wird der Kraftstoffdruck im Steuerraum erneut angehoben, so dass die Düsennadel wieder zurück in Anlage an den Düsensitz fährt und die Einspritzöffnungen verschließt. Die Bewegung der Düsennadel soll dabei möglichst rasch geschehen, um mehrere, sehr rasch aufeinander folgende Einspritzungen realisieren zu können. Dazu muss die Düsennadel einerseits eine möglichst geringe Masse aufweisen, um entsprechend schnell auf die wechselnden hydraulischen Drücke mit einer entsprechenden Längsbewegung zu reagieren. Andererseits muss die Düsennadel aber auch eine hohe Stabilität aufweisen, da die angreifenden hydraulischen Kräfte sehr hoch sind und die Anforderungen an die mechanische Stabilität der Düsennadel entsprechend. The invention is based on an injection nozzle for fuel injection systems, as known for example from the document DE 102 37 003 AI. Such a fuel injection valve has a nozzle body, in which a piston-shaped nozzle needle is arranged longitudinally displaceable, which cooperates by its longitudinal movement with a nozzle seat and thus opens and closes one or more injection openings. The nozzle needle is arranged in a pressure chamber within the nozzle body, which is filled with fuel under high pressure when the fuel injection valve, the part of which is the injection nozzle, in operation. The control of the longitudinal movement of the nozzle needle takes place by the variation of the pressure in a control chamber, the pressure applied to the nozzle seat facing away from the nozzle needle with fuel pressure, wherein the pressure in the control chamber by means of a control valve is adjustable. If the pressure in the control chamber decreases, the hydraulic closing force on the nozzle needle also drops, and the nozzle needle is lifted off the nozzle seat by the fuel pressure in the pressure chamber and releases the injection openings. To close the nozzle needle, the fuel pressure in the control chamber is raised again so that the nozzle needle moves back into contact with the nozzle seat and closes the injection openings. The movement of the nozzle needle should be done as quickly as possible in order to realize several, very quickly successive injections. For this purpose, the nozzle needle on the one hand must have the lowest possible mass to react accordingly fast to the changing hydraulic pressures with a corresponding longitudinal movement. On the other hand, the nozzle needle but also have a high stability, since the attacking hydraulic forces are very high and the requirements for the mechanical stability of the nozzle needle accordingly.
Vorteile der Erfindung Advantages of the invention
Die erfindungsgemäße Einspritzdüse für ein Kraftstoffe inspritzsystem weist den Vorteil auf, dass die Düsennadel eine gegenüber der massiven Ausführung na- hezu identische mechanische Stabilität aufweist, jedoch ein deutlich geringeresThe injection nozzle according to the invention for a fuel injection system has the advantage that the nozzle needle has a mechanical stability which is almost identical to the solid design, but a significantly lower one
Gewicht, was zu entsprechend niedrigeren Schaltzeiten des Kraftstoffeinspritzventils führt und damit zu der Möglichkeit, Einspritzungen sehr rasch aufeinander durchzuführen, insbesondere Einspritzungen, die sich in mehrere Teileinspritzungen gliedern. Dazu weist die Einspritzdüse einen Düsenkörper mit einem mit Kraftstoff unter hohem Druck befüllbaren Druckraum auf, in dem eine kolbenförmige, eine Längsachse aufweisende Düsennadel längsverschiebbar angeordnet ist. Die Düsennadel wirkt zum Öffnen und Schließen wenigstens einer Einspritzöffnung mit einem Düsensitz zusammen, wobei in der Düsennadel eine schlitzförmige Ausnehmung ausgebildet ist, die ausgehend von der Oberfläche der Dü- sennadel zumindest einen Teil des Volumens der Düsennadel umfasst, durch das die Längsachse verläuft. Weight, resulting in correspondingly lower switching times of the fuel injection valve and thus to the ability to perform injections very quickly to each other, in particular injections, which are divided into several partial injections. For this purpose, the injection nozzle on a nozzle body with a fillable with fuel at high pressure pressure chamber in which a piston-shaped, a longitudinal axis having nozzle needle is arranged longitudinally displaceable. The nozzle needle cooperates with a nozzle seat for opening and closing at least one injection opening, wherein a slot-shaped recess is formed in the nozzle needle, which starting from the surface of the nozzle needle comprises at least part of the volume of the nozzle needle through which the longitudinal axis passes.
Durch die Ausbildung der schlitzförmigen Ausnehmung, die das Volumen der Düsennadel umfasst, in dem die Längsachse verläuft, bleiben die äußeren Struk- turen der Düsennadel praktisch unverändert, so dass die gleiche oder nahezu die gleiche Biegestabilität der Düsennadel erreicht wird wie bei einer massiven Ausführung. Durch das Vorsehen der schlitzförmigen Ausnehmung wird jedoch das Gewicht der Düsennadel deutlich verringert, was kürzere Schaltzeiten ermöglicht und damit insbesondere Einspritzungen, die sehr rasch aufeinander folgen, wie es für Vor-und Nacheinspritzungen bei modernen, schnelllaufenden Brennkraftmaschinen notwendig ist. By forming the slot-shaped recess, which comprises the volume of the nozzle needle, in which the longitudinal axis extends, the outer structures of the nozzle needle remain virtually unchanged, so that the same or almost the same bending stability of the nozzle needle is achieved as in a solid version. By providing the slot-shaped recess, however, the weight of the nozzle needle is significantly reduced, which allows shorter switching times and thus in particular injections that follow each other very quickly, such as it is necessary for pre- and post-injections in modern, high-speed internal combustion engines.
In einer ersten vorteilhaften Ausgestaltung sind in der Düsennadel mehrere schlitzförmige Ausnehmungen ausgebildet. Durch die Ausbildung von mehreren schlitzförmigen Ausnehmungen, die in vorteilhafter Weise einander durchdringen können, lässt sich sehr effektiv Material aus der Düsennadel entfernen, ohne dass die Stabilität, insbesondere die Biegestabilität, wesentlich beeinträchtigt wird. Durchdringen die schlitzförmigen Ausnehmungen die Düsennadel, reichen sie also von einer Oberfläche der Düsennadel zur anderen, lassen sie sich besonders gut und kostengünstig herstellen. In a first advantageous embodiment, a plurality of slot-shaped recesses are formed in the nozzle needle. By forming a plurality of slot-shaped recesses, which can advantageously penetrate each other, material can be very effectively removed from the nozzle needle, without the stability, in particular the bending stability, being substantially impaired. The slot-shaped recesses penetrate the nozzle needle, so they extend from one surface of the nozzle needle to the other, they can be particularly well and inexpensively.
In einer weiteren voreilhaften Ausgestaltung durchdringen sich die Ausnehmungen so, dass im Querschnitt der Düsennadel betrachtet, eine kreuzförmige Ausnehmung gebildet wird. Durch diese Ausnehmung, die in vorteilhafter Weise auch Y-förmig gestaltet sein kann, lässt sich effektiv Material wegnehmen bei einer größtmöglichen Stabilität gegenüber Biegungen. In a further advantageous embodiment, the recesses penetrate such that viewed in the cross section of the nozzle needle, a cross-shaped recess is formed. By this recess, which can be designed advantageously Y-shaped, can effectively take away material with the greatest possible stability against bending.
In einer weiteren vorteilhaften Ausgestaltung sind wenigstens zwei der Ausnehmungen in Längsrichtung der Düsennadel zueinander versetzt ausgebildet. Auf diese Weise lässt sich Material über die gesamte Länge der Düsennadel abtragen, was insbesondere bei sogenannten langen Nadeln von Vorteil ist, wie sie bei leckagefreien Kraftstoffeinspritzsystemen verwendet werden. In a further advantageous embodiment, at least two of the recesses are formed offset from one another in the longitudinal direction of the nozzle needle. In this way, material can be removed over the entire length of the nozzle needle, which is particularly advantageous in so-called long needles, as used in leak-free fuel injection systems.
Zeichnungen drawings
In der Zeichnung sind verschiedene Ausführungsbespiele der erfindungsgemäßen Einspritzdüse dargestellt. Es zeigt In the drawing, various Ausführungsbespiele the injection nozzle according to the invention are shown. It shows
Figur 1 einen Längsschnitt durch eine erfindungsgemäße Einspritzdüse, wobei nur die wesentlichen Teile dargestellt sind, 1 shows a longitudinal section through an injection nozzle according to the invention, wherein only the essential parts are shown,
Figur 2 eine vergrößerte Darstellung in der Düsennadel, 2 shows an enlarged view in the nozzle needle,
Figur 2a einen Querschnitt durch die dargestellte Düsennadel der Fig FIG. 2 a shows a cross section through the illustrated nozzle needle of FIG
lang der Linie A-A, Figur 2b einen Querschnitt durch die Düsennadel der Figur 2 entlang der Linie B-B, long line AA, FIG. 2b shows a cross section through the nozzle needle of FIG. 2 along the line BB,
Figur 3 ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Düsennadel, FIG. 3 shows a further exemplary embodiment of a nozzle needle according to the invention,
Figur 4 einen Querschnitt durch die Düsennadel der Figur 3 entlang der Linie FIG. 4 shows a cross section through the nozzle needle of FIG. 3 along the line
IV-IV. IV-IV.
Beschreibung der Ausführungsbeispiele Description of the embodiments
In Figur 1 ist eine erfindungsgemäße Einspritzdüse dargestellt, wie sie in Kraft- stoffeinspritzsystemen verwendet wird, mit denen Kraftstoff unter hohem Druck in Brennräumen von Brennkraftmaschinen eingespritzt werden kann. Die in der Figur 1 dargestellte Einspritzdüse weist einen Düsenkörper 2 auf, in dem ein Druckraum 4 ausgebildet ist, der mit Kraftstoff unter hohem Druck befüllbar ist. Der Düsenkörper 2 bildet in Einbaulage in einer Brennkraftmaschine einen Teil eines Kraftstoffinjektors, der den Anschluss für die Zuführung des unter hohem Druck stehenden Kraftstoffs aufweist. Im Druckraum 4 ist eine kolbenförmige Düsennadel 5 längsverschiebbar angeordnet, die eine Längsachse 11 aufweist und die an ihrem brennraumseitigen Ende eine Dichtfläche 7 ausbildet, mit der die Düsennadel 5 mit einem Düsensitz 8 zusammenwirkt, der - ebenso wie die Dichtfläche 7 - im Wesentlichen eine konische Form aufweist. Vom Düsensitz 8 gehen eine oder mehrere Einspritzöffnungen 10 aus, wobei die Düsennadel 5 mittels ihrer Dichtfläche 7 so mit dem Düsensitz 8 zusammenwirkt, dass bei Anlage der Düsennadel 5 auf dem Düsensitz 8 die Einspritzöffnungen 10 gegen den Druckraum 4 verschlossen werden, während dann, wenn die Ventilnadel 5 vom Düsensitz 8 abgehoben hat, die Einspritzöffnungen 10 mit dem Druckraum 4 verbunden sind. FIG. 1 shows an injection nozzle according to the invention, as used in fuel injection systems with which fuel can be injected under high pressure into combustion chambers of internal combustion engines. The injection nozzle shown in Figure 1 has a nozzle body 2, in which a pressure chamber 4 is formed, which can be filled with fuel under high pressure. In the installed position in an internal combustion engine, the nozzle body 2 forms part of a fuel injector which has the connection for the supply of the fuel under high pressure. In the pressure chamber 4, a piston-shaped nozzle needle 5 is arranged longitudinally displaceable, which has a longitudinal axis 11 and at its combustion chamber end forms a sealing surface 7, with which the nozzle needle 5 cooperates with a nozzle seat 8, which - as well as the sealing surface 7 - essentially a conical Form has. From the nozzle seat 8 go from one or more injection ports 10, wherein the nozzle needle 5 cooperates by means of its sealing surface 7 with the nozzle seat 8, that when the nozzle needle 5 on the nozzle seat 8, the injection openings 10 are closed against the pressure chamber 4, while if the valve needle 5 has lifted from the nozzle seat 8, the injection ports 10 are connected to the pressure chamber 4.
Mit ihrem dem Düsensitz 8 abgewandten Ende ist die Düsennadel 5 in einer Hülse 12 geführt, wobei zwischen der Hülse 12 und einem Stützring 15, der sich an einem Absatz 16 der Düsennadel 5 abstützt, eine Schraubendruckfeder 14 unter Druckvorspannung angeordnet ist, durch deren Vorspannungen einerseits die Düsennadel 5 gegen den Düsensitz 8 gedrückt wird und andererseits die Hülse 12 gegen eine in der Figur 1 nicht dargestellte Drosselplatte. Durch die Hülse 12, die Stirnseite der Düsennadel 5 und durch die nicht dargestellte Drosselplatte wird ein Steuerraum 13 begrenzt, in dem über ein in der Zeichnung ebenfalls nicht dargestelltes Steuerventil ein wechselnder Kraftstoffdruck einstellbar ist. Je nach Kraftstoff druck im Steuerraum 13 ergibt sich eine hydraulische Kraft auf die dem Düsensitz 8 abgewandten Stirnseite der Düsenadel 5, mit der die Düsennadel 5 gegen den Düsensitz 8 gedrückt wird. Wird der Druck im Steuerraum 13 erniedrigt, so bewirkt der Kraftstoffdruck im Druckraum 4 auf die Düsennadel 5 eine vom Düsensitz 8 weggerichtete hydraulische Kraft, die die Düsennadel 5 in den Steuerraum 13 hineindrückt und die Einspritzöffnungen 10 freigibt, so dass Kraftstoff aus dem Druckraum 4 zu den Einspritzöffnungen 10 strömt und von dort ausgespritzt wird. Durch Erhöhung des Kraftstoffdrucks aus dem Steuerraum 13 wieder auf den Ausgangsdruck, der vor der Einspritzung dem Wert innerhalb des Druckraums 4 entspricht, wird die Düsennadel 5 erneut in Anlage an den Düsensitz 8 gedrückt und verschließt die Einspritzöffnungen 10. With its end facing away from the nozzle seat 8, the nozzle needle 5 is guided in a sleeve 12, wherein between the sleeve 12 and a support ring 15 which is supported on a shoulder 16 of the nozzle needle 5, a helical compression spring 14 is arranged under pressure bias, by their bias voltages on the one hand the Nozzle needle 5 is pressed against the nozzle seat 8 and on the other hand, the sleeve 12 against a throttle plate, not shown in the figure 1. Through the sleeve 12, the end face of the nozzle needle 5 and the throttle plate, not shown, a control chamber 13 is limited, in which a likewise not shown in the drawing control valve, an alternating fuel pressure is adjustable. Depending on the fuel pressure in the control chamber 13 results in a hydraulic force on the nozzle seat 8 facing away from the end of the nozzle needle 5, with the nozzle needle 5 is pressed against the nozzle seat 8. If the pressure in the control chamber 13 is lowered, the fuel pressure in the pressure chamber 4 on the nozzle needle 5 causes a directed away from the nozzle seat 8 hydraulic force which pushes the nozzle needle 5 in the control chamber 13 and the injection openings 10 releases, so that fuel from the pressure chamber 4 to the injection openings 10 flows and is ejected from there. By increasing the fuel pressure from the control chamber 13 back to the output pressure corresponding to the value within the pressure chamber 4 before the injection, the nozzle needle 5 is again pressed into contact with the nozzle seat 8 and closes the injection openings 10th
In der Düsennadel 5 sind mehrere schlitzförmige Ausnehmungen 20 vorgesehen, wie in der Figur 2 nochmals vergrößert dargestellt, die die Düsennadel 5 ohne den zugehörigen Düsenkörper 5 zeigt. Im Bereich, der dem Düsensitz abgewandt ist und der in Einbauvorlage von der Feder 14 umgeben ist, sind zwei schlitzförmige Ausnehmungen 20 vorgesehen, die sich in der Längsachse 11 kreuzen, so dass im Querschnitt in der Düsennadel 5 eine kreuzförmige Ausnehmung 20 zu erkennen ist, wie in Figur 2a dargestellt, wo ein Querschnitt durch die Düsennadel 5 entlang der Linie A-A gezeigt ist. Durch die Anordnung der beiden schlitzförmigen Ausnehmungen 20 wird das Material hauptsächlich im Inneren der Düsennadel 5 entfernt, also in dem Bereich, durch den die Längsachse 11 verläuft, so dass sich zwar eine große Gewichtseinsparung der Düsennadel 5 ergibt, jedoch die Biegesteifigkeit der Düsennadel 5 kaum beeinträchtigt wird, da die Biegesteifigkeit der Düsennadel 5 im Wesentlichen von den äußeren Strukturen der Düsennadel 5 bestimmt wird, die weitgehend intakt sind. In the nozzle needle 5 a plurality of slot-shaped recesses 20 are provided, as shown in the figure 2 again enlarged, showing the nozzle needle 5 without the associated nozzle body 5. In the region which faces away from the nozzle seat and which is enclosed in the mounting template by the spring 14, two slot-shaped recesses 20 are provided, which intersect in the longitudinal axis 11, so that a cross-shaped recess 20 can be seen in cross-section in the nozzle needle 5, as shown in Figure 2a, where a cross-section through the nozzle needle 5 is shown along the line AA. Due to the arrangement of the two slot-shaped recesses 20, the material is removed mainly in the interior of the nozzle needle 5, ie in the region through which the longitudinal axis 11 extends, so that although a large weight saving of the nozzle needle 5 results, but the bending stiffness of the nozzle needle 5 barely is impaired, since the flexural rigidity of the nozzle needle 5 is essentially determined by the outer structures of the nozzle needle 5, which are largely intact.
Weiter sind im mittleren Abschnitt der Düsennadel 5, dem sogenannten Führungsabschnitt, mit dem die Düsennadel 5 innerhalb des Druckraums 4 geführt ist, drei schlitzförmige Ausnehmungen 20' vorgesehen, die sich in einem Winkel von 120° im Bereich der Längsachse 11 schneiden, so dass im Querschnitt ein Y-förmiger Hohlraum in der Düsennadel 5 gebildet wird, wie in Figur 2b in einem Querschnitt der Düsennadel 5 entlang der Linie B-B gezeigt ist. Auch hier ist der Effekt, ebenso wie im oberen Bereich der Düsennadel 5, dass das Material hauptsächlich im Bereich der Längsachse 11 entfernt ist, während die äußeren Strukturen der Düsennadel 5 die Biegesteifigkeit auf nahezu dem selben Wert halten. Da der Führungsabschnitt der Düsennadel 5 größere Flächenelemente an der Außenseite benötigt, mit denen die Düsennadel 5 im Druckraum 4 geführt ist, ist die Anordnung von drei schlitzförmigen Ausnehmungen 20' vorteilhaft, die entsprechend große Flächen an der Düsennadel 5 belassen und zu einer sicheren Führung der Düsennadel 5 im Druckraum 4 beitragen. Further, in the central portion of the nozzle needle 5, the so-called guide portion, with which the nozzle needle 5 is guided within the pressure chamber 4, three slot-shaped recesses 20 'are provided, which extends at an angle of 120 ° in the region of the longitudinal axis 11, so that a Y-shaped cavity in the nozzle needle 5 is formed in cross-section, as shown in Figure 2b in a cross section of the nozzle needle 5 along the line BB. Again, the effect, as well as in the upper region of the nozzle needle 5, that the material is removed mainly in the region of the longitudinal axis 11, while the outer structures of the nozzle needle 5 hold the bending stiffness to almost the same value. Since the guide portion of the nozzle needle 5 requires larger surface elements on the outside, with which the nozzle needle 5 is guided in the pressure chamber 4, the arrangement of three slot-shaped recesses 20 'is advantageous, leave the correspondingly large areas on the nozzle needle 5 and a secure guidance of Nozzle needle 5 in the pressure chamber 4 contribute.
In Figur 3 ist ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Düsennadel 5' dargestellt. In der Düsennadel 5' sind ebenfalls mehrere schlitzförmige Ausnehmungen 20 vorgesehen, die sich einerseits ebenfalls durchdringen, wie in Figur 2a bereits dargestellt, jedoch sind sie auch in Längsrichtung der Düsennadel 5' gesehen versetzt angeordnet, so dass eine Gewichtseinsparung über die gesamte Länge der Düsennadel 5' möglich ist. Eine Düsennadel 5', wie in Figur 3 gezeigt, wird beispielsweise bei Einspritzventilen verwendet, die eine sogenannte lange Nadel verwenden, also leckagefrei arbeiten. Die Figur 4 zeigt einen Querschnitt durch die Düsennadel 5' der Figur 3 entlang der Linie IV-IV. FIG. 3 shows a further exemplary embodiment of a nozzle needle 5 'according to the invention. In the nozzle needle 5 'are also a plurality of slot-shaped recesses 20 are provided, which also penetrate one another, as shown in Figure 2a already shown, but they are also arranged offset in the longitudinal direction of the nozzle needle 5', so that a weight saving over the entire length of the nozzle needle 5 'is possible. A nozzle needle 5 ', as shown in Figure 3, for example, used in injectors that use a so-called long needle, so operate leak-free. FIG. 4 shows a cross section through the nozzle needle 5 'of FIG. 3 along the line IV-IV.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015212467.3A DE102015212467A1 (en) | 2015-07-03 | 2015-07-03 | Injection nozzle for a fuel injection system |
| DE102015212467.3 | 2015-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2017005556A1 true WO2017005556A1 (en) | 2017-01-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2016/065053 Ceased WO2017005556A1 (en) | 2015-07-03 | 2016-06-28 | Injection nozzle for a fuel injection system |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102015212467A1 (en) |
| WO (1) | WO2017005556A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017116214A1 (en) * | 2017-07-18 | 2019-01-24 | L'orange Gmbh | Nozzle needle for a fuel injector, fuel injector and injection system for an internal combustion engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19712590A1 (en) * | 1997-03-26 | 1998-10-01 | Bosch Gmbh Robert | Electromagnetically actuated valve |
| EP2664779A1 (en) * | 2012-05-15 | 2013-11-20 | Robert Bosch GmbH | Valve for metering out fluid |
| EP2803850A1 (en) * | 2013-05-16 | 2014-11-19 | Continental Automotive GmbH | Valve needle for a fluid injector, valve needle assembly, valve assembly and fuel injector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10237003A1 (en) | 2002-08-13 | 2004-03-18 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
-
2015
- 2015-07-03 DE DE102015212467.3A patent/DE102015212467A1/en not_active Withdrawn
-
2016
- 2016-06-28 WO PCT/EP2016/065053 patent/WO2017005556A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19712590A1 (en) * | 1997-03-26 | 1998-10-01 | Bosch Gmbh Robert | Electromagnetically actuated valve |
| EP2664779A1 (en) * | 2012-05-15 | 2013-11-20 | Robert Bosch GmbH | Valve for metering out fluid |
| EP2803850A1 (en) * | 2013-05-16 | 2014-11-19 | Continental Automotive GmbH | Valve needle for a fluid injector, valve needle assembly, valve assembly and fuel injector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102015212467A1 (en) | 2017-01-05 |
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