EP1332283B1 - Injection needle with elastic needle tip - Google Patents

Injection needle with elastic needle tip Download PDF

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Publication number
EP1332283B1
EP1332283B1 EP01992835A EP01992835A EP1332283B1 EP 1332283 B1 EP1332283 B1 EP 1332283B1 EP 01992835 A EP01992835 A EP 01992835A EP 01992835 A EP01992835 A EP 01992835A EP 1332283 B1 EP1332283 B1 EP 1332283B1
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EP
European Patent Office
Prior art keywords
needle
injection
needle tip
sealing
tip
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 - Lifetime
Application number
EP01992835A
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German (de)
French (fr)
Other versions
EP1332283A1 (en
Inventor
Alwin Perras
Thomas Hofmann
Hakan Yalcin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
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Filing date
Publication date
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Publication of EP1332283A1 publication Critical patent/EP1332283A1/en
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Publication of EP1332283B1 publication Critical patent/EP1332283B1/en
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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
    • F02M61/16—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
    • 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
    • F02M61/047—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 the valves being formed by deformable nozzle parts, e.g. flexible plates or discs with fuel discharge orifices
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means

Definitions

  • the invention relates to an injection needle according to the preamble of patent claim 1 and an injection valve with such an injection needle.
  • Injection needles have very different shapes, in particular in the area of the needle tip, with which an influencing of the fuel flow is achieved. Furthermore, a sealing surface is formed on the needle tip, which is associated with a sealing seat of a nozzle body.
  • the sealing seat is stressed dynamically and statically when opening and closing the injector. With slight deviations in the adjustment of the injection needle in the injection valve, an increased wear on the sealing seat occurs. The wear causes a stroke enlargement of the injection needle and / or a leakage at the sealing seat.
  • an injection needle for an injection valve with a needle body which has a needle shaft and a needle tip, wherein a needle tip is formed on the sealing surface, which is designed to rest on a sealing seat of a nozzle body, wherein the sealing surface conical and rotationally symmetrical an axis of symmetry of the injection needle is formed, wherein the sealing seat is formed conically and rotationally symmetrical to the axis of symmetry of the injection needle, wherein the sealing seat is associated with the sealing surface and between the sealing surface and the sealing seat is formed a differential angle.
  • the needle tip is designed as a rotationally symmetrical body.
  • the object of the invention is to provide a simply constructed injection needle with which a wear of the sealing seat is reduced.
  • a significant advantage of the invention is that the needle tip is connected via an elastic element with the needle shaft.
  • the elastic element dampens the pulse with which the injection needle with the needle tip strikes a sealing seat, so that a lower stress on the sealing seat is achieved.
  • a preferred embodiment of the elastic element is to form a center symmetrically arranged connecting piece between the needle shaft and the needle point.
  • the needle tip, the connecting piece and the needle shaft is integrally formed. In this way, a particularly simple embodiment of the invention is provided.
  • the connecting piece is formed in such a way that an annular circumferential groove is introduced into the injection needle, which defines the connecting piece.
  • a preferred embodiment of the invention is to form the connector with a diameter of 0.5 to 1.5 mm.
  • the groove being spaced from a sealing edge of the needle tip, which is in the range of 0 to 1 mm.
  • the groove has a U-shaped cross-section.
  • a U-shaped groove is easy to introduce, so that the injection needle is inexpensive to manufacture.
  • an injection valve 1 shows an injection valve 1, which has a nozzle body 2.
  • an injection needle 10 is movably guided.
  • the injection needle 10 has a needle tip 11 with a sealing surface 6.
  • the sealing surface 6 is closed State of the injection valve 1 with a sealing edge 22 on a sealing seat 5, which is formed above injection holes 4 on the inner wall of the nozzle body 2.
  • an injection chamber 3 is formed, which is connected to an inlet bore 8.
  • the inlet bore 8 is connected to a fuel reservoir, which holds fuel at a predetermined pressure.
  • an actuator 7 is arranged above the injection needle 10, which has electrical connections 9.
  • the actuator 7 is in operative connection with the injection needle 10 and defines the position of the injection needle 10 as a function of the activation via the connections 9. If an injection takes place, then the actuator 7 is actuated in a corresponding manner and the injection needle 10 is lifted by the actuator 7 from the sealing seat 5. This results in a hydraulic connection between the injection space 3 and the injection holes 4. As a result, fuel is discharged through the injection holes 4.
  • the control of the actuator 7 is interrupted and the actuator 7 moves the injection needle 10 again with the sealing surface 6 on the sealing seat 5, so that the hydraulic connection between the injection chamber 3 and the injection holes 4 is interrupted.
  • Fig. 2 shows a partial section of the front portion of the injection needle 10 and the nozzle body 2.
  • the injection needle 10 is divided into a needle shaft 12 and a needle tip 11, wherein the needle tip 11 is connected via a connecting piece 13 with the needle shaft 12.
  • the needle tip 11 has a conical sealing surface 6, which is rotationally symmetrical to an axis of symmetry 14.
  • the sealing surface 6 is associated with a conical sealing seat 5, which is also formed rotationally symmetrical to the axis of symmetry 14 on the inner wall of the nozzle body 2. Between the sealing surface 6 and the sealing seat 5, a differential angle A is formed, so that a secure seal between the sealing seat 5 and the sealing surface 6 is ensured.
  • the sealing surface 6 is above the injection holes 4 with the sealing edge 22 on the sealing seat 5 in a circumferential annular surface.
  • the needle shaft 12 passes from a first cylindrical portion 15 in a second, tapered portion 16 via.
  • a third portion 17 connects, which is also cylindrical, but has a smaller cross section than the first portion 15.
  • the third section 17 in turn tapers over a circumferential, annular groove 18 in a fourth section 19, which represents the connecting piece 13. Subsequently, the cross section widens starting from the fourth section 19 in a fifth section 20.
  • the fifth section 20 represents the upper part of the needle tip 11.
  • the needle tip 11 tapers in the conical shape of the sealing surface 6 as far as an end face 21 which surrounds the needle tip 11 concludes.
  • the fifth section 20 and the third section 17 preferably have the same cross-section.
  • the groove 18 preferably has a U-shape in cross-section. However, other shapes of grooves 18 are possible.
  • the connecting piece 13 is preferably arranged centrally symmetrical to the symmetry axis 14 and preferably has a diameter D of 0.5 to 1.8 mm.
  • a preferred size for the diameter of the connector 13 is in the range of 1.1 to 1.3 mm.
  • the width B of the groove 18 seen parallel to the axis of symmetry 14 preferably has a value of 0.1 to 1 mm. Especially good properties were achieved with a groove width of 0.25 to 0.35 mm.
  • the groove 18 has a lower edge 23, at which the needle tip 11 tapers to the connecting piece 13.
  • the distance between the sealing edge 22 and the lower edge 23 is of particular importance, since the distance substantially defines the elastic properties of the connection of the needle tip to the injection needle and thus the damping properties of the injection needle. Good damping properties are achieved with a distance Z of the lower edge 23 from the sealing edge 22, which is in the range of 0.1 to 1 mm.
  • the lower edge 23 preferably extends after a rounding perpendicular to the longitudinal axis of the injection needle.
  • An essential function of the groove 18 is to achieve a reduction of the cross section of the connecting piece 13.
  • the maximum yield stress exerted by the needle tip 11 on the nozzle body 2 can be reduced by up to 50%.
  • Preferred values for a combination of the diameter D and the distance Z are for the diameter D from 1 to 1.3 mm and the distance Z from 0.1 to 1 mm.
  • the injection needle 10 of Figure 2 is integrally formed from the needle shaft 12, the connector 13 and the needle tip 11.
  • the injection needle 10 is off Working steel S 652 or made of the material 100 chrome 6.
  • the invention is not limited to the one-piece embodiment, but the needle shaft 12, the connector 13 and the needle tip 11 can also be made of different materials, wherein the connector 13 is connected to the needle shaft 12 and the needle tip 11 via suitable connecting surfaces or connecting means ,
  • the connector 13 can be screwed into the needle shaft 12 and the needle tip 11 or welded to the needle shaft 12 and the needle tip 11.
  • the connector 13 is made of a material having more damping properties than the material of the needle shank 12 and / or the material of the needle tip 11.

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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)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Description

Die Erfindung betrifft eine Einspritznadel gemäß dem Oberbegriff des Patentanspruchs 1 und ein Einspritzventil mit einer solchen Einspritznadel.The invention relates to an injection needle according to the preamble of patent claim 1 and an injection valve with such an injection needle.

Einspritznadeln weisen unterschiedlichste Formen insbesondere im Bereich der Nadelspitze auf, mit denen eine Beeinflussung der Kraftstoffströmung erreicht wird. Weiterhin ist an der Nadelspitze eine Dichtfläche ausgebildet, die einem Dichtsitz eines Düsenkörpers zugeordnet ist. Der Dichtsitz wird beim Öffnen und Schließen des Einspritzventils dynamisch und statisch stark beansprucht. Bei geringen Abweichungen in der Justierung der Einspritznadel im Einspritzventil tritt ein erhöhter Verschleiß am Dichtsitz auf. Durch den Verschleiß wird eine Hubvergrößerung der Einspritznadel und/oder eine Undichtheit am Dichtsitz bewirkt.Injection needles have very different shapes, in particular in the area of the needle tip, with which an influencing of the fuel flow is achieved. Furthermore, a sealing surface is formed on the needle tip, which is associated with a sealing seat of a nozzle body. The sealing seat is stressed dynamically and statically when opening and closing the injector. With slight deviations in the adjustment of the injection needle in the injection valve, an increased wear on the sealing seat occurs. The wear causes a stroke enlargement of the injection needle and / or a leakage at the sealing seat.

Aus der JP 62162768 ist eine Einspritznadel für ein Einspritzventil mit einem Nadelkörper bekannt, der einen Nadelschaft und eine Nadelspitze aufweist, wobei eine Nadelspitze an der Dichtfläche ausgebildet ist, die zum Aufliegen auf einem Dichtsitz eines Düsenkörpers ausgebildet ist, wobei die Dichtfläche kegelförmig und rotationssymmetrisch zu einer Symmetrieachse der Einspritznadel ausgebildet ist, wobei der Dichtsitz kegelförmig und rotationssymmetrisch zu der Symmetrieachse der Einspritznadel ausgebildet ist, wobei der Dichtsitz der Dichtfläche zugeordnet ist und zwischen der Dichtfläche und dem Dichtsitz ein Differenzwinkel ausgebildet ist. Die Nadelspitze ist als rotationssymmetrischer Körper ausgebildet.From JP 62162768 an injection needle for an injection valve with a needle body is known which has a needle shaft and a needle tip, wherein a needle tip is formed on the sealing surface, which is designed to rest on a sealing seat of a nozzle body, wherein the sealing surface conical and rotationally symmetrical an axis of symmetry of the injection needle is formed, wherein the sealing seat is formed conically and rotationally symmetrical to the axis of symmetry of the injection needle, wherein the sealing seat is associated with the sealing surface and between the sealing surface and the sealing seat is formed a differential angle. The needle tip is designed as a rotationally symmetrical body.

Bisher ist es bekannt, aufwendige Geometrien am Dichtsitz oder an der Einspritznadel auszubilden, um einen Dichtsitzverschleiß in Grenzen zu halten.So far, it is known to form complex geometries on the sealing seat or on the injection needle in order to keep a sealing seat wear within limits.

Die Aufgabe der Erfindung besteht darin, eine einfach aufgebaute Einspritznadel bereitzustellen, mit der ein Verschleißen des Dichtsitzes reduziert ist.The object of the invention is to provide a simply constructed injection needle with which a wear of the sealing seat is reduced.

Die Aufgabe der Erfindung wird durch die Merkmale des Anspruchs 1 gelöst.The object of the invention is solved by the features of claim 1.

Ein wesentlicher Vorteil der Erfindung besteht darin, dass die Nadelspitze über ein elastisches Element mit dem Nadelschaft verbunden ist. Das elastische Element dämpft den Impuls, mit der die Einspritznadel mit der Nadelspitze auf einen Dichtsitz aufschlägt, so dass eine geringere Beanspruchung des Dichtsitzes erreicht wird.A significant advantage of the invention is that the needle tip is connected via an elastic element with the needle shaft. The elastic element dampens the pulse with which the injection needle with the needle tip strikes a sealing seat, so that a lower stress on the sealing seat is achieved.

Weitere vorteilhafte Ausbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben. Eine bevorzugte Ausführungsform des elastischen Elementes besteht darin, ein mittensymmetrisch angeordnetes Verbindungsstück zwischen dem Nadelschaft und der Nadelspitze auszubilden. Dabei ist die Nadelspitze, das Verbindungsstück und der Nadelschaft einstückig ausgebildet. Auf diese Weise wird eine besonders einfache Ausführungsform der Erfindung bereitgestellt.Further advantageous embodiments of the invention are specified in the dependent claims. A preferred embodiment of the elastic element is to form a center symmetrically arranged connecting piece between the needle shaft and the needle point. In this case, the needle tip, the connecting piece and the needle shaft is integrally formed. In this way, a particularly simple embodiment of the invention is provided.

Vorzugsweise wird das Verbindungsstück in der Weise ausgebildet, dass eine ringförmig umlaufende Nut in die Einspritznadel eingebracht ist, die das Verbindungsstück definiert.Preferably, the connecting piece is formed in such a way that an annular circumferential groove is introduced into the injection needle, which defines the connecting piece.

Eine bevorzugte Ausführungsform der Erfindung besteht darin, das Verbindungsstück mit einem Durchmesser von 0,5 bis 1,5 mm auszubilden.A preferred embodiment of the invention is to form the connector with a diameter of 0.5 to 1.5 mm.

Gute elastische Eigenschaften der Nadelspitze werden erreicht, indem die Nut einen Abstand von einer Dichtkante der Nadelspitze aufweist, der im Bereich von 0 bis 1 mm liegt.Good elastic properties of the needle tip are achieved by the groove being spaced from a sealing edge of the needle tip, which is in the range of 0 to 1 mm.

In einer bevorzugten Ausführungsform weist die Nut einen U-förmigen Querschnitt auf. Eine U-förmige Nut ist einfach einzubringen, so dass die Einspritznadel kostengünstig zu fertigen ist.In a preferred embodiment, the groove has a U-shaped cross-section. A U-shaped groove is easy to introduce, so that the injection needle is inexpensive to manufacture.

Die Erfindung wird im Folgenden anhand der Figuren näher erläutert. Es zeigen

  • Fig. 1 einen schematischen Aufbau eines Einspritzventils,
  • Fig. 2 eine Nadelspitze mit einem Nadelschaft, und Fig. 3 eine weitere Ausführungsform der Einspritznadel.
The invention will be explained in more detail below with reference to FIGS. Show it
  • 1 shows a schematic structure of an injection valve,
  • Fig. 2 is a needle tip with a needle shaft, and Fig. 3 shows another embodiment of the injection needle.

Fig. 1 zeigt ein Einspritzventil 1, das einen Düsenkörper 2 aufweist. Im Düsenkörper 2 ist eine Einspritznadel 10 beweglich geführt. Die Einspritznadel 10 weist eine Nadelspitze 11 mit einer Dichtfläche 6 auf. Die Dichtfläche 6 liegt im geschlossenen Zustand des Einspritzventils 1 mit einer Dichtkante 22 auf einem Dichtsitz 5 auf, der oberhalb von Einspritzlöchern 4 an der Innenwandung des Düsenkörpers 2 ausgebildet ist. Zwischen der Einspritznadel 10 und dem Düsenkörper 2 ist ein Einspritzraum 3 ausgebildet, der an eine Zulaufbohrung 8 angeschlossen ist. Über die Zulaufbohrung 8 wird der Einspritzraum 3 mit Kraftstoff versorgt. In einer bevorzugten Ausführungsform ist die Zulaufbohrung 8 mit einem Kraftstoffspeicher verbunden, der Kraftstoff mit einem vorgegebenen Druck bereithält.1 shows an injection valve 1, which has a nozzle body 2. In the nozzle body 2, an injection needle 10 is movably guided. The injection needle 10 has a needle tip 11 with a sealing surface 6. The sealing surface 6 is closed State of the injection valve 1 with a sealing edge 22 on a sealing seat 5, which is formed above injection holes 4 on the inner wall of the nozzle body 2. Between the injection needle 10 and the nozzle body 2, an injection chamber 3 is formed, which is connected to an inlet bore 8. About the inlet bore 8 of the injection chamber 3 is supplied with fuel. In a preferred embodiment, the inlet bore 8 is connected to a fuel reservoir, which holds fuel at a predetermined pressure.

Im Einspritzventil 1 ist ein Aktor 7 über der Einspritznadel 10 angeordnet, der elektrische Anschlüsse 9 aufweist. Der Aktor 7 steht in Wirkverbindung mit der Einspritznadel 10 und legt abhängig von der Ansteuerung über die Anschlüsse 9 die Position der Einspritznadel 10 fest. Soll eine Einspritzung erfolgen, so wird der Aktor 7 in entsprechender Weise angesteuert und die Einspritznadel 10 wird durch den Aktor 7 vom Dichtsitz 5 abgehoben. Somit entsteht eine hydraulische Verbindung zwischen dem Einspritzraum 3 und den Einspritzlöchern 4. Als Folge wird Kraftstoff über die Einspritzlöcher 4 abgegeben.In the injection valve 1, an actuator 7 is arranged above the injection needle 10, which has electrical connections 9. The actuator 7 is in operative connection with the injection needle 10 and defines the position of the injection needle 10 as a function of the activation via the connections 9. If an injection takes place, then the actuator 7 is actuated in a corresponding manner and the injection needle 10 is lifted by the actuator 7 from the sealing seat 5. This results in a hydraulic connection between the injection space 3 and the injection holes 4. As a result, fuel is discharged through the injection holes 4.

Soll die Einspritzung beendet werden, so wird die Ansteuerung des Aktors 7 unterbrochen und der Aktor 7 bewegt die Einspritznadel 10 wieder mit der Dichtfläche 6 auf den Dichtsitz 5, so dass die hydraulische Verbindung zwischen dem Einspritzraum 3 und den Einspritzlöchern 4 unterbrochen ist.If the injection is to be ended, the control of the actuator 7 is interrupted and the actuator 7 moves the injection needle 10 again with the sealing surface 6 on the sealing seat 5, so that the hydraulic connection between the injection chamber 3 and the injection holes 4 is interrupted.

Fig. 2 zeigt einen Teilausschnitt des vorderen Bereichs der Einspritznadel 10 und des Düsenkörpers 2. Die Einspritznadel 10 ist in einen Nadelschaft 12 und eine Nadelspitze 11 unterteilt, wobei die Nadelspitze 11 über ein Verbindungsstück 13 mit dem Nadelschaft 12 verbunden ist. Die Nadelspitze 11 weist eine kegelförmige Dichtfläche 6 auf, die rotationssymmetrisch zu einer Symmetrieachse 14 ausgebildet ist. Der Dichtfläche 6 ist ein kegelförmiger Dichtsitz 5 zugeordnet, der ebenfalls rotationssymmetrisch zur Symmetrieachse 14 an der Innenwandung des Düsenkörpers 2 ausgebildet ist. Zwischen der Dichtfläche 6 und dem Dichtsitz 5 ist ein Differenzwinkel A ausgebildet, so dass eine sichere Abdichtung zwischen dem Dichtsitz 5 und der Dichtfläche 6 gewährleistet ist. Im geschlossenen Zustand liegt die Dichtfläche 6 oberhalb der Einspritzlöcher 4 mit der Dichtkante 22 auf dem Dichtsitz 5 in einer umlaufenden Ringfläche auf.Fig. 2 shows a partial section of the front portion of the injection needle 10 and the nozzle body 2. The injection needle 10 is divided into a needle shaft 12 and a needle tip 11, wherein the needle tip 11 is connected via a connecting piece 13 with the needle shaft 12. The needle tip 11 has a conical sealing surface 6, which is rotationally symmetrical to an axis of symmetry 14. The sealing surface 6 is associated with a conical sealing seat 5, which is also formed rotationally symmetrical to the axis of symmetry 14 on the inner wall of the nozzle body 2. Between the sealing surface 6 and the sealing seat 5, a differential angle A is formed, so that a secure seal between the sealing seat 5 and the sealing surface 6 is ensured. In the closed state, the sealing surface 6 is above the injection holes 4 with the sealing edge 22 on the sealing seat 5 in a circumferential annular surface.

Der Nadelschaft 12 geht von einem ersten zylinderförmigen Teilstück 15 in ein zweites, kegelförmiges Teilstück 16 über. An das zweite Teilstück 16 schließt sich ein drittes Teilstück 17 an, das ebenfalls zylinderförmig ausgebildet ist, aber einen kleineren Querschnitt als das erste Teilstück 15 aufweist. Das dritte Teilstück 17 verjüngt sich wiederum über eine umlaufende, ringförmige Nut 18 in einem vierten Teilstück 19, das das Verbindungsstück 13 darstellt. Anschließend erweitert sich der Querschnitt ausgehend vom vierten Teilstück 19 in einem fünften Teilstück 20. Das fünfte Teilstück 20 stellt den oberen Teil der Nadelspitze 11 dar. Die Nadelspitze 11 verjüngt sich in der Kegelform der Dichtfläche 6 bis zu einer Endfläche 21, die die Nadelspitze 11 abschließt.The needle shaft 12 passes from a first cylindrical portion 15 in a second, tapered portion 16 via. To the second portion 16, a third portion 17 connects, which is also cylindrical, but has a smaller cross section than the first portion 15. The third section 17 in turn tapers over a circumferential, annular groove 18 in a fourth section 19, which represents the connecting piece 13. Subsequently, the cross section widens starting from the fourth section 19 in a fifth section 20. The fifth section 20 represents the upper part of the needle tip 11. The needle tip 11 tapers in the conical shape of the sealing surface 6 as far as an end face 21 which surrounds the needle tip 11 concludes.

Das fünfte Teilstück 20 und das dritte Teilstück 17 weisen vorzugsweise den gleichen Querschnitt auf. Die Nut 18 weist vorzugsweise im Querschnitt eine U-Form auf. Es sind jedoch auch andere Formen von Nuten 18 möglich.The fifth section 20 and the third section 17 preferably have the same cross-section. The groove 18 preferably has a U-shape in cross-section. However, other shapes of grooves 18 are possible.

Das Verbindungsstück 13 ist vorzugsweise mittensymmetrisch zur Symmetrieachse 14 angeordnet und weist vorzugsweise einen Durchmesser D von 0,5 bis 1,8 mm auf. Eine bevorzugte Größe für den Durchmesser des Verbindungsstückes 13 liegt im Bereich von 1,1 bis 1,3 mm.The connecting piece 13 is preferably arranged centrally symmetrical to the symmetry axis 14 and preferably has a diameter D of 0.5 to 1.8 mm. A preferred size for the diameter of the connector 13 is in the range of 1.1 to 1.3 mm.

Die Breite B der Nut 18 parallel zur Symmetrieachse 14 gesehen weist vorzugsweise einen Wert von 0,1 bis 1 mm auf. Besonders gute Eigenschaften wurden mit einer Nutbreite von 0,25 bis 0,35 mm erreicht.The width B of the groove 18 seen parallel to the axis of symmetry 14 preferably has a value of 0.1 to 1 mm. Especially good properties were achieved with a groove width of 0.25 to 0.35 mm.

Die Nut 18 weist eine Unterkante 23 auf, an der sich die Nadelspitze 11 zu dem Verbindungsstück 13 verjüngt. Der Abstand zwischen der Dichtkante 22 und der Unterkante 23 ist von besonderer Bedeutung, da der Abstand wesentlich die elastischen Eigenschaften der Anbindung der Nadelspitze an die Einspritznadel und damit die dämpfenden Eigenschaften der Einspritznadel festlegt. Gute dämpfende Eigenschaften werden mit einem Abstand Z der Unterkante 23 von der Dichtkante 22 erreicht, der im Bereich von 0,1 bis 1 mm liegt.The groove 18 has a lower edge 23, at which the needle tip 11 tapers to the connecting piece 13. The distance between the sealing edge 22 and the lower edge 23 is of particular importance, since the distance substantially defines the elastic properties of the connection of the needle tip to the injection needle and thus the damping properties of the injection needle. Good damping properties are achieved with a distance Z of the lower edge 23 from the sealing edge 22, which is in the range of 0.1 to 1 mm.

Die Unterkante 23 verläuft vorzugsweise nach einer Rundung senkrecht zur Längsachse der Einspritznadel. Eine wesentliche Funktion der Nut 18 besteht darin, eine Reduzierung des Querschnittes des Verbindungsstückes 13 zu erreichen.The lower edge 23 preferably extends after a rounding perpendicular to the longitudinal axis of the injection needle. An essential function of the groove 18 is to achieve a reduction of the cross section of the connecting piece 13.

Versuche haben ergeben, dass eine Ausbildung des Verbindungsstückes 13 mit einem geringen Abstand zur Dichtkante 22 besonders dämpfende Eigenschaften ermöglicht. Jedoch ist es vorteilhaft aus Gründen der Fertigungsgenauigkeit und evtl. auftretendem Verschleiß einen festgelegten Abstand von der Dichtkante 22 einzuhalten.Experiments have shown that a formation of the connecting piece 13 with a small distance from the sealing edge 22 allows particularly damping properties. However, it is advantageous to maintain a fixed distance from the sealing edge 22 for reasons of manufacturing accuracy and possibly occurring wear.

Durch die dämpfende Wirkung des Verbindungsstückes 13 kann die maximale Fließspannung, die von der Nadelspitze 11 auf den Düsenkörper 2 ausgeübt wird, um bis zu 50% reduziert werden.By the damping effect of the connecting piece 13, the maximum yield stress exerted by the needle tip 11 on the nozzle body 2 can be reduced by up to 50%.

Bevorzugte Werte für eine Kombination aus dem Durchmesser D und dem Abstand Z liegen für den Durchmesser D von 1 - 1,3 mm und dem Abstand Z von 0,1 bis 1 mm.Preferred values for a combination of the diameter D and the distance Z are for the diameter D from 1 to 1.3 mm and the distance Z from 0.1 to 1 mm.

Die Einspritznadel 10 der Figur 2 ist einstückig aus dem Nadelschaft 12, dem Verbindungsstück 13 und der Nadelspitze 11 ausgebildet. Beispielsweise wird die Einspritznadel 10 aus Arbeitsstahl S 652 oder aus dem Material 100 Chrom 6 hergestellt.The injection needle 10 of Figure 2 is integrally formed from the needle shaft 12, the connector 13 and the needle tip 11. For example, the injection needle 10 is off Working steel S 652 or made of the material 100 chrome 6.

Die Erfindung ist jedoch nicht auf die einstückige Ausbildungsform beschränkt, sondern der Nadelschaft 12, das Verbindungsstück 13 und die Nadelspitze 11 können auch aus verschiedenen Materialien hergestellt sein, wobei das Verbindungsstück 13 mit dem Nadelschaft 12 und der Nadelspitze 11 über geeignete Verbindungsflächen oder Verbindungsmittel verbunden ist. Beispielsweise kann das Verbindungsstück 13 in den Nadelschaft 12 und die Nadelspitze 11 eingeschraubt oder mit dem Nadelschaft 12 und der Nadelspitze 11 verschweißt werden.However, the invention is not limited to the one-piece embodiment, but the needle shaft 12, the connector 13 and the needle tip 11 can also be made of different materials, wherein the connector 13 is connected to the needle shaft 12 and the needle tip 11 via suitable connecting surfaces or connecting means , For example, the connector 13 can be screwed into the needle shaft 12 and the needle tip 11 or welded to the needle shaft 12 and the needle tip 11.

Vorzugsweise wird in dieser Ausführungsform das Verbindungsstück 13 aus einem Material hergestellt, das dämpfendere Eigenschaften als das Material des Nadelschaftes 12 und/oder das Material der Nadelspitze 11 aufweist.Preferably, in this embodiment, the connector 13 is made of a material having more damping properties than the material of the needle shank 12 and / or the material of the needle tip 11.

Claims (5)

  1. Injection needle for an injection valve (1) with a needle body which comprises a needle shaft (12) and a needle tip (11), with a sealing surface (6) configured on the needle tip (11), said surface being configured to rest on a sealing seat (5) of a nozzle body (2),
    wherein
    the sealing surface (6) is tapered and is configured with rotational symmetry in respect of an axis of symmetry (14) of the injection needle, the sealing seat (5) is tapered and is configured with rotational symmetry in respect of the axis of symmetry (14), with the sealing seat (5) being assigned to the sealing surface (6) and a differential angle (A) being configured between the sealing surface (6) and the sealing seat (5), the needle tip (11) being configured as a rotationally symmetrical body and being connected to the needle shaft (12) by means of an impulse-damping element, the impulse damping element is configured as a groove (18), characterised in that the respective sections (17, 20) of the needle shaft (12) and the needle tip (11), which directly abut the groove (18), have the same cross-section and that the groove (18) is at a distance from a sealing edge (22) of the needle tip (11) which lies in the region of 0.1 to 1mm.
  2. Injection needle according to claim 1, characterised in that the needle tip (11) passes over the groove (18) into a connector piece (13) disposed with central symmetry, that the connector piece (13) is connected to the needle shaft (12), that the diameter D of the connector piece (13) is configured in such a way that the needle tip (11) hits the sealing seat with less force.
  3. Injection needle according to claim 2, characterised in that the connector piece (13) is configured by means of a ring-shaped groove (18), which is incorporated into the injection needle (10).
  4. Injection needle according to one of claims 2 or 3, characterised in that the connector piece (13) has a diameter (D) of 0.5 to 1.8 mm.
  5. Injection valve with an injection needle according to one of claims 1 to 4.
EP01992835A 2000-11-02 2001-10-30 Injection needle with elastic needle tip Expired - Lifetime EP1332283B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10054183 2000-11-02
DE10054183A DE10054183A1 (en) 2000-11-02 2000-11-02 Injection needle with elastic needle tip
PCT/DE2001/004102 WO2002036961A1 (en) 2000-11-02 2001-10-30 Injection needle with elastic needle tip

Publications (2)

Publication Number Publication Date
EP1332283A1 EP1332283A1 (en) 2003-08-06
EP1332283B1 true EP1332283B1 (en) 2006-06-07

Family

ID=7661811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01992835A Expired - Lifetime EP1332283B1 (en) 2000-11-02 2001-10-30 Injection needle with elastic needle tip

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US (1) US20030213459A1 (en)
EP (1) EP1332283B1 (en)
DE (2) DE10054183A1 (en)
WO (1) WO2002036961A1 (en)

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EP1522721B1 (en) * 2003-10-06 2006-05-03 Delphi Technologies, Inc. Injection nozzle
JP2005226580A (en) * 2004-02-13 2005-08-25 Denso Corp Fuel injection device
US7497850B2 (en) * 2004-03-02 2009-03-03 Infusion Systems, Llc Medical device needle receiving port
JP6059915B2 (en) * 2012-08-27 2017-01-11 日立オートモティブシステムズ株式会社 Fuel injection valve
DE102016203028A1 (en) * 2016-02-26 2017-08-31 Bayerische Motoren Werke Aktiengesellschaft fuel injector
FR3057623B1 (en) * 2016-10-14 2020-12-25 Delphi Int Operations Luxembourg Sarl FUEL INJECTOR VALVE MEMBER
CN107143452B (en) * 2017-07-17 2024-03-08 辽阳新风科技有限公司 Glib coupling part, fuel injector and car
JP2022088969A (en) * 2020-12-03 2022-06-15 株式会社ジャパンエンジンコーポレーション Fuel injection valve and marine internal combustion engine

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Also Published As

Publication number Publication date
US20030213459A1 (en) 2003-11-20
WO2002036961A1 (en) 2002-05-10
DE50110071D1 (en) 2006-07-20
EP1332283A1 (en) 2003-08-06
DE10054183A1 (en) 2002-05-29

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