EP3191706A1 - Nozzle needle for a fuel injection device, and fuel injection device - Google Patents

Nozzle needle for a fuel injection device, and fuel injection device

Info

Publication number
EP3191706A1
EP3191706A1 EP15744224.5A EP15744224A EP3191706A1 EP 3191706 A1 EP3191706 A1 EP 3191706A1 EP 15744224 A EP15744224 A EP 15744224A EP 3191706 A1 EP3191706 A1 EP 3191706A1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
needle tip
receptacle
tip
shaft
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.)
Granted
Application number
EP15744224.5A
Other languages
German (de)
French (fr)
Other versions
EP3191706B1 (en
Inventor
Wilhelm Christ
Lars Ulrich
Maike Hekel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3191706A1 publication Critical patent/EP3191706A1/en
Application granted granted Critical
Publication of EP3191706B1 publication Critical patent/EP3191706B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—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
    • 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
    • F02M61/166—Selection of particular materials
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • 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
    • F02M2200/90—Selection of particular materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9007—Ceramic materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9092—Sintered materials

Definitions

  • the invention relates to a nozzle needle for a fuel injection device according to the preamble of claim 1. Furthermore, the invention relates to a
  • a generic nozzle needle is known from DE 10 2004 028 617 A1
  • the known nozzle needle has a sleeve-shaped nozzle needle shaft which is connected to the injection openings facing side with a nozzle needle tip.
  • the nozzle needle tip is made of sintered metal, while the nozzle needle shaft, for example, consists of tool steel.
  • the nozzle needle shaft is connected on the opposite side of the nozzle needle tip with a formed as a separate component, sleeve-shaped guide portion, which also consists of sintered metal.
  • the mushroom-shaped nozzle needle tip has a substantially conical shape in the area protruding from the nozzle needle shaft.
  • the nozzle needle tip has a cylindrically shaped fastening region, wherein between the fastening region of the nozzle needle tip and the inner wall of the nozzle needle shaft a frictional connection is formed by a shrink or press connection.
  • a disadvantage of the known from the cited document nozzle needle is that although the respective function can be optimized by the choice of different materials for the nozzle needle shaft and the nozzle needle tip, the formation of a shrink or press connection between the
  • Nozzle needle shaft and the nozzle needle tip due to the relatively low Diameter of the components and the manufacturing tolerances, however, is relatively expensive or a high-quality and accurate production of the components is required. In addition, the production of a different shapes or
  • nozzle needle tip made of a different material or by means of another production technique in which a blank has to be correspondingly shaped or machined is relatively expensive.
  • a nozzle needle is known from EP 1 059 437 B1, in which the nozzle needle tip is received in a blind hole-shaped receptacle of a nozzle needle shaft. Furthermore, the nozzle needle tip is arranged in a liftable manner in the axial direction of the nozzle needle shaft, with a sleeve likewise arranged in the nozzle needle shaft in the region of the recess lifting the nozzle needle tip in the direction of the injection openings of the fuel! limited.
  • the nozzle needle known from the above-mentioned font makes it possible by pressure with the fuel pressure in the recess on the back of the nozzle needle tip to move the nozzle needle tip delayed to the nozzle needle shaft, so as to open, for example, at different areas of a nozzle body injection ports controlled in time or to shut down.
  • the nozzle needle is designed relatively expensive.
  • the invention has the object, a nozzle needle for a fuel injection device, in particular a fuel! Njektor, according to the preamble of claim 1 such that a structurally simplified and
  • Fuel injection device with the features of claim 1 characterized solved that the nozzle needle shaft through a blind hole
  • the nozzle needle shaft with its blind hole for receiving the nozzle needle tip a particularly simple geometric configuration of the nozzle needle tip can be achieved, in which the axial stop, in contrast to the aforementioned prior art, must not be formed by a frictional connection, but solely by the geometric design the inclusion in the nozzle needle shaft and the nozzle needle tip.
  • the nozzle needle according to the invention makes it possible, for example, to allow a sliding fit between the nozzle needle tip and the receptacle in the nozzle needle shaft.
  • this consists of a wear-resistant material such as ceramic, carbide or a sapphire and the nozzle needle shaft of a solid material made of steel.
  • Training allows a particularly simple, inexpensive and easy-to-edit design of the nozzle needle shaft in a particularly wear-resistant design of the nozzle needle tip, so that the nozzle needle or the fuel injector, in which the nozzle needle is installed over the entire life considered at least largely constant closing and
  • Opening times due to a relatively low wear or a relatively low geometric change of the nozzle needle tip has.
  • Nozzle needle tip is larger than acting in the same direction
  • the nozzle needle tip has a conically shaped seating area, which adjoins directly to the arranged within the receptacle, cylindrically shaped portion of the nozzle needle tip.
  • a particularly simple production of the nozzle needle tip is possible, since only the nozzle needle tip has to be substantially formed or formed when the material of the nozzle needle tip consists of a rod material, such that the required fit between the nozzle needle tip and the nozzle needle shaft via a correspondingly accurate dimensioning or training the recording is achieved in the nozzle needle shaft.
  • the material of the nozzle needle tip consists of a rod material
  • Nozzle needle shaft in the mouth area of the receptacle a conical
  • Such a design allows, in particular, an advantageous inflow of fuel in the region of injection openings and also ensures that only the nozzle needle tip, and not the nozzle needle shaft is arranged in the closed position in contact with the inner surface of a nozzle body.
  • Nozzle needle tip and the inclusion of a press fit is formed.
  • An interference fit is always useful or necessary if it can be produced relatively cheap in view of the manufacturing costs (depending on the materials used Düsennadelschafts and the nozzle needle tip and the dimensions of the components) and / or if any
  • a transition or clearance fit is formed between the nozzle needle tip and the receptacle.
  • a particularly simple or inexpensive manufacturability of the components due to a relatively large tolerance range of the components is made possible and beyond simplifies the assembly process to the effect that the insertion of the nozzle needle tip into the receptacle of the nozzle needle shaft can be particularly easily.
  • At least one leakage gap is formed between the nozzle needle tip and the receptacle.
  • This leakage gap can either be conditioned solely by the tolerance position of the components, or else, preferably, by a targeted processing, for example, the nozzle needle tip in the form of a longitudinal groove or the like. Such a configuration causes a slightly delayed movement between the nozzle needle shaft and the nozzle needle tip for releasing injection openings.
  • the invention also includes a fuel injector, with a
  • FIG. 1 shows a partially sectioned side view of a nozzle needle according to the invention for a fuel injector in the form of a fuel injector
  • Fig. 2 shows a partial region of the nozzle needle in the region of the nozzle needle tip in a longitudinal section
  • Fig. 3 shows a portion of the nozzle needle of FIG. 1 and 2 in the installed position in a fuel injector in its closed position in longitudinal section.
  • FIG. 1 shows a nozzle needle 10 according to the invention for a fuel injector 100 shown in FIG. 3 in the form of a fuel.
  • Njektors in particular a fuel injector for use in a
  • the fuel injector is part of a so-called common rail system, is injected at the high-pressure fuel in the combustion chamber of an internal combustion engine, as is prior art and therefore will not be explained in the further course.
  • the nozzle needle 10 consists essentially of two separate components, a nozzle needle shaft 1 1 and a nozzle needle tip 12.
  • Düsennadelschaft 1 1 consists of a solid material, in particular
  • the nozzle needle shaft 1 1 has in a central region a plurality of guide portions 13 which serve the nozzle needle shaft 1 1 and the nozzle needle 10 in the direction of its longitudinal axis 14 by contact with the inner wall
  • the nozzle needle shaft 1 1 has a receptacle 20 in the form of a blind hole 21 for receiving the nozzle needle tip 12.
  • the blind hole 21 having a constant diameter D has a base 22 which serves as an axial stop for the nozzle needle tip 12 in the direction of the nozzle needle tip 12 opposite end 23 of the nozzle needle shaft 1 1 is used.
  • the end 23 dips into a control space (not shown) of the fuel injector in order to control the movement of the nozzle needle 10 for opening or closing injection openings 26 formed in the injector housing 18 in a known manner.
  • the nozzle needle tip 12 is made of a different material than the
  • Nozzle needle shaft 1 in particular of a wear-resistant material such as ceramic, carbide or a sapphire.
  • the nozzle needle tip 12 has at least within the receptacle 20 on a cylindrical portion 24 with an at least approximately constant diameter d, wherein the
  • Diameter d of the portion 24 and the diameter D of the blind hole 21 are coordinated such that preferably a transition or clearance fit between the nozzle needle tip 12 and the nozzle needle shaft 1 1 is formed, and wherein the diameter d at the same time the largest
  • Diameter of the nozzle needle tip 12 forms.
  • the diameters d, D are coordinated with one another such that an interference fit is formed between the nozzle needle tip 12 and the nozzle needle shaft 11.
  • leakage grooves or the like. are formed (not shown) to allow a defined flow of fuel in the region of the bottom 22 of the blind hole 21.
  • a conically formed seating area 25 adjoins the receptacle 20.
  • the seating area 25 is designed to be in the position shown in FIG.
  • the nozzle needle shaft 1 1 has a conical outer surface 28 in the mouth region of the receptacle 20 and the blind hole 21.
  • Extension of the seat portion 25 formed straight line 29 extends at a distance from the outer periphery 28 of the nozzle needle shaft 1 first In the event that between the nozzle needle tip 12 and the nozzle needle shaft 1 1 in the region of the receptacle 20 is a transition or
  • fuel can reach into the region between the bottom 22 of the blind hole 21 and the bottom 22 facing the end face of the nozzle needle tip 12.
  • the nozzle needle shaft 1 1 begins to move at the first instant, such that an axial gap 30 arises between the bottom 22 of the blind hole 21 and the nozzle needle tip 12, which is in the range of a few micrometers.
  • the nozzle needle tip 12 also begins to move away from its sealing seat in order to release the injection openings 26.
  • nozzle needle 10 or the fuel injection system 100 described so far can be modified or modified in many ways without deviating from the idea of the invention.

Abstract

The invention relates to a nozzle needle (10) for a fuel injection device (100), in particular a fuel injector, comprising a nozzle needle tip (12) which is connected to a nozzle needle shaft (11). The nozzle needle tip (12) and the nozzle needle shaft (11) consist of different materials. According to the invention, the nozzle needle shaft (11) has a receiving area (20) formed by a blind bore (21) for the nozzle needle tip (12). The base (22) of the receiving area (20) forms an axial stop for the nozzle needle tip (12), and the nozzle needle tip (12) has an at least approximately constant diameter (d) within the receiving area (20), said diameter simultaneously forming the largest diameter of the nozzle needle tip (12).

Description

Beschreibung  description
Düsennadel für eine Kraftstoffeinspritzeinrichtung und Nozzle needle for a fuel injector and
Kraftstoffeinspritzeinrichtung  Fuel injection system
Stand der Technik Die Erfindung betrifft eine Düsennadel für eine Kraftstoffeinspritzeinrichtung nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung eine The invention relates to a nozzle needle for a fuel injection device according to the preamble of claim 1. Furthermore, the invention relates to a
Kraftstoffeinspritzeinrichtung unter Verwendung einer erfindungsgemäßen Düsennadel. Eine gattungsgemäße Düsennadel ist aus der DE 10 2004 028 617 A1 derFuel injection device using a nozzle needle according to the invention. A generic nozzle needle is known from DE 10 2004 028 617 A1
Anmelderin bekannt. Die bekannte Düsennadel weist einen hülsenförmigen Düsennadelschaft auf, der auf der den Einspritzöffnungen zugewandten Seite mit einer Düsennadelspitze verbunden ist. Insbesondere ist es vorgesehen, dass die Düsennadelspitze aus Sintermetall besteht, während der Düsennadelschaft beispielsweise aus Werkzeugstahl besteht. Darüber hinaus ist es bei der bekannten Düsennadel vorgesehen, dass der Düsennadelschaft auf der der Düsennadelspitze gegenüberliegenden Seite mit einem als separates Bauteil ausgebildeten, hülsenförmigen Führungsabschnitt verbunden ist, der ebenfalls aus Sintermetall besteht. Die pilzförmig ausgebildete Düsennadelspitze weist in dem aus dem Düsennadelschaft herausragenden Bereich eine im Wesentlichen konisch ausgebildete Form auf. Innerhalb des Düsennadelschafts weist die Düsennadelspitze einen zylindrisch ausgebildeten Befestigungsbereich auf, wobei zwischen dem Befestigungsbereich der Düsennadelspitze und der Innenwand des Düsennadelschafts eine kraftschlüssige Verbindung durch eine Schrumpf- oder Pressverbindung ausgebildet ist. Applicant known. The known nozzle needle has a sleeve-shaped nozzle needle shaft which is connected to the injection openings facing side with a nozzle needle tip. In particular, it is provided that the nozzle needle tip is made of sintered metal, while the nozzle needle shaft, for example, consists of tool steel. Moreover, it is provided in the known nozzle needle, that the nozzle needle shaft is connected on the opposite side of the nozzle needle tip with a formed as a separate component, sleeve-shaped guide portion, which also consists of sintered metal. The mushroom-shaped nozzle needle tip has a substantially conical shape in the area protruding from the nozzle needle shaft. Within the nozzle needle shaft, the nozzle needle tip has a cylindrically shaped fastening region, wherein between the fastening region of the nozzle needle tip and the inner wall of the nozzle needle shaft a frictional connection is formed by a shrink or press connection.
Nachteilhaft bei der aus der genannten Schrift bekannten Düsennadel ist es, dass durch die Wahl unterschiedlicher Werkstoffe für den Düsennadelschaft und die Düsennadelspitze zwar die jeweilige Funktion optimiert werden kann, das Ausbilden einer Schrumpf- bzw. Pressverbindung zwischen dem A disadvantage of the known from the cited document nozzle needle is that although the respective function can be optimized by the choice of different materials for the nozzle needle shaft and the nozzle needle tip, the formation of a shrink or press connection between the
Düsennadelschaft und der Düsennadelspitze aufgrund der relativ geringen Durchmesser der Bauteile und der Fertigungstoleranzen jedoch relativ aufwendig ist bzw. eine hochwertige und genaue Fertigung der Bauteile erforderlich ist. Darüber hinaus ist die Herstellung einer unterschiedliche Formen bzw. Nozzle needle shaft and the nozzle needle tip due to the relatively low Diameter of the components and the manufacturing tolerances, however, is relatively expensive or a high-quality and accurate production of the components is required. In addition, the production of a different shapes or
Durchmesser aufweisenden Düsennadelspitze zwar für den Fall, dass diese aus Sintermetall besteht, relativ einfach möglich, die Ausbildung einer Although having nozzle diameter tip nozzle in the event that it consists of sintered metal, relatively easily possible, the formation of a
Düsennadelspitze aus einem anderen Material bzw. mittels einer anderen Fertigungstechnik, bei der ein Rohling entsprechend geformt bzw. spanend bearbeitet werden muss, ist jedoch relativ aufwendig. However, nozzle needle tip made of a different material or by means of another production technique in which a blank has to be correspondingly shaped or machined is relatively expensive.
Weiterhin ist aus der EP 1 059 437 B1 eine Düsennadel bekannt, bei der die Düsennadelspitze in einer sacklochformigen Aufnahme eines Düsennadelschafts aufgenommen ist. Weiterhin ist die Düsennadelspitze in Axialrichtung des Düsennadelschafts hubbeweglich angeordnet, wobei eine ebenfalls in dem Düsennadelschaft im Bereich der Ausnehmung angeordnete Hülse den Hub der Düsennadelspitze in Richtung der Einspritzöffnungen des Kraftstoff! njektors begrenzt. Die aus der genannten Schrift bekannte Düsennadel ermöglicht es, durch Druckbeaufschlagung mit dem Kraftstoff druck in der Ausnehmung auf der Rückseite der Düsennadelspitze die Düsennadelspitze zeitlich verzögert zum Düsennadelschaft zu bewegen, um damit beispielsweise an unterschiedlichen Bereichen eines Düsenkörpers ausgebildete Einspritzöffnungen zeitlich gesteuert zu öffnen bzw. zu schließen. Durch die Verwendung des zusätzlichen Furthermore, a nozzle needle is known from EP 1 059 437 B1, in which the nozzle needle tip is received in a blind hole-shaped receptacle of a nozzle needle shaft. Furthermore, the nozzle needle tip is arranged in a liftable manner in the axial direction of the nozzle needle shaft, with a sleeve likewise arranged in the nozzle needle shaft in the region of the recess lifting the nozzle needle tip in the direction of the injection openings of the fuel! limited. The nozzle needle known from the above-mentioned font makes it possible by pressure with the fuel pressure in the recess on the back of the nozzle needle tip to move the nozzle needle tip delayed to the nozzle needle shaft, so as to open, for example, at different areas of a nozzle body injection ports controlled in time or to shut down. By using the additional
hülsenförmigen Bauteils zur Hubbegrenzung der Düsennadelspitze ist die Düsennadel relativ aufwendig gestaltet. sleeve-shaped member for Hubbegrenzung the nozzle needle tip, the nozzle needle is designed relatively expensive.
Offenbarung der Erfindung Disclosure of the invention
Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Düsennadel für eine Kraftstoffeinspritzeinrichtung, insbesondere einen Kraftstoff! njektor, nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass eine konstruktiv vereinfachte und Based on the illustrated prior art, the invention has the object, a nozzle needle for a fuel injection device, in particular a fuel! Njektor, according to the preamble of claim 1 such that a structurally simplified and
herstellungstechnisch besonders vorteilhafte Ausgestaltung der Düsennadel erzielt wird. Diese Aufgabe wird erfindungsgemäß bei einer Düsennadel für eine manufacturing technology particularly advantageous embodiment of the nozzle needle is achieved. This object is achieved with a nozzle needle for a
Kraftstoffeinspritzeinrichtung mit den Merkmalen des Anspruchs 1 dadurch gelöst, dass der Düsennadelschaft eine durch eine Sacklochbohrung Fuel injection device with the features of claim 1 characterized solved that the nozzle needle shaft through a blind hole
ausgebildete Aufnahme für die Düsennadelspitze aufweist, wobei der Grund der Aufnahme einen Axialanschlag für die Düsennadelspitze ausbildet, und dass die Düsennadelspitze innerhalb der Aufnahme einen konstanten Durchmesser aufweist, der gleichzeitig den größten Durchmesser der Düsennadelspitze ausbildet. Mit anderen Worten gesagt bedeutet dies, dass durch die formed receptacle for the nozzle needle tip, wherein the reason of the recording forms an axial stop for the nozzle needle tip, and that the nozzle needle tip within the receptacle has a constant diameter, which simultaneously forms the largest diameter of the nozzle needle tip. In other words, this means that through the
geometrische Gestaltung des Düsennadelschafts mit seiner Sacklochbohrung zur Aufnahme der Düsennadelspitze eine besonders einfache geometrische Ausgestaltung der Düsennadelspitze erzielbar ist, bei der der Axialanschlag, im Gegensatz zum eingangs erwähnten Stand der Technik, nicht durch eine kraftschlüssige Verbindung gebildet werden muss, sondern allein durch die geometrische Gestaltung der Aufnahme in dem Düsennadelschaft und der Düsennadelspitze. Dadurch wird insbesondere die benötigte Genauigkeit bzw. die erforderliche Toleranz bzgl. des Durchmessers bei der Fertigung der Einzelteile herabgesetzt, da die erfindungsgemäße Düsennadel es ermöglicht, auch beispielsweise einen Schiebesitz zwischen der Düsennadelspitze und der Aufnahme in dem Düsennadelschaft zuzulassen. geometric design of the nozzle needle shaft with its blind hole for receiving the nozzle needle tip a particularly simple geometric configuration of the nozzle needle tip can be achieved, in which the axial stop, in contrast to the aforementioned prior art, must not be formed by a frictional connection, but solely by the geometric design the inclusion in the nozzle needle shaft and the nozzle needle tip. As a result, in particular the required accuracy or the required tolerance with respect to the diameter in the production of the individual parts is reduced, since the nozzle needle according to the invention makes it possible, for example, to allow a sliding fit between the nozzle needle tip and the receptacle in the nozzle needle shaft.
Vorteilhafte Weiterbildungen der erfindungsgemäßen Düsennadel für eine Kraftstoffeinspritzeinrichtung sind in den Unteransprüchen aufgeführt. Advantageous developments of the nozzle needle according to the invention for a fuel injection device are listed in the subclaims.
In besonders bevorzugter Ausgestaltung der Düsennadelspitze besteht diese aus einem verschleißfesten Material wie Keramik, Hartmetall oder einem Saphir und der Düsennadelschaft aus einem Vollmaterial aus Stahl. Eine derartige In a particularly preferred embodiment of the nozzle needle tip, this consists of a wear-resistant material such as ceramic, carbide or a sapphire and the nozzle needle shaft of a solid material made of steel. Such
Ausbildung ermöglicht eine besonders einfache, kostengünstige und einfach zu bearbeitende Ausbildung des Düsennadelschafts bei einer besonders verschleißfesten Ausgestaltung der Düsennadelspitze, so dass die Düsennadel bzw. der Kraftstoffinjektor, in dem die Düsennadel verbaut ist, über die gesamte Lebensdauer betrachtet zumindest weitgehend konstante Schließ- und Training allows a particularly simple, inexpensive and easy-to-edit design of the nozzle needle shaft in a particularly wear-resistant design of the nozzle needle tip, so that the nozzle needle or the fuel injector, in which the nozzle needle is installed over the entire life considered at least largely constant closing and
Öffnungszeitpunkte infolge eines relativ geringen Verschleißes bzw. einer relativ geringen geometrischen Veränderung der Düsennadelspitze aufweist. Opening times due to a relatively low wear or a relatively low geometric change of the nozzle needle tip has.
Ganz besonders bevorzugt ist es, wenn die in Richtung des Grunds der It is particularly preferred if the in the direction of the bottom of the
Aufnahme des Düsennadelschafts hydraulisch wirkende Fläche der Recording the nozzle needle shaft hydraulically acting surface of the
Düsennadelspitze größer ist als die in die gleiche Richtung wirkende Nozzle needle tip is larger than acting in the same direction
hydraulische Fläche des Düsennadelschafts. Eine derartige Ausbildung bewirkt, dass die Düsennadelspitze in Öffnungsrichtung der Düsennadel stets mit einer größeren hydraulischen Kraft beaufschlagt wird als der Düsennadelschaft, so dass die Düsennadelspitze stets in Richtung des Grunds in der Aufnahme des Düsennadelschafts gedrückt wird. Eine derartige Ausbildung ermöglicht es insbesondere, auf eine Presspassung zwischen dem Düsennadelschaft und derhydraulic surface of the nozzle needle shaft. Such a training causes that the nozzle needle tip is always acted upon in the opening direction of the nozzle needle with a larger hydraulic force than the nozzle needle shaft, so that the nozzle needle tip is always pressed in the direction of the bottom in the receptacle of the nozzle needle shaft. Such a design makes it possible in particular to a press fit between the nozzle needle shaft and the
Düsennadelspitze zu verzichten, so dass die Bauteile infolge der geringeren Toleranzanforderungen relativ preiswert herstellbar sind. To dispense nozzle tip, so that the components are relatively inexpensive to produce due to the lower tolerance requirements.
Insbesondere ist es darüber hinaus vorgesehen, dass die Düsennadelspitze einen konisch geformten Sitzbereich aufweist, der sich unmittelbar an den innerhalb der Aufnahme angeordneten, zylindrisch ausgebildeten Bereich der Düsennadelspitze anschließt. Dadurch ist eine besonders einfache Fertigung der Düsennadelspitze möglich, da lediglich im Wesentlichen die Düsennadelspitze geformt bzw. ausgebildet werden muss, wenn das Material der Düsennadelspitze aus einem Stangenmaterial besteht, derart, dass die benötigte Passung zwischen der Düsennadelspitze und dem Düsennadelschaft über eine entsprechend genaue Dimensionierung bzw. Ausbildung der Aufnahme in dem Düsennadelschaft erzielt wird. In weiterhin konstruktiv bevorzugter Ausgestaltung ist es vorgesehen, dass derIn particular, it is further provided that the nozzle needle tip has a conically shaped seating area, which adjoins directly to the arranged within the receptacle, cylindrically shaped portion of the nozzle needle tip. As a result, a particularly simple production of the nozzle needle tip is possible, since only the nozzle needle tip has to be substantially formed or formed when the material of the nozzle needle tip consists of a rod material, such that the required fit between the nozzle needle tip and the nozzle needle shaft via a correspondingly accurate dimensioning or training the recording is achieved in the nozzle needle shaft. In a further structurally preferred embodiment, it is provided that the
Düsennadelschaft im Mündungsbereich der Aufnahme eine konische Nozzle needle shaft in the mouth area of the receptacle a conical
Außenfläche aufweist, und dass eine in Richtung der Außenfläche verlaufende Verlängerung des Sitzbereichs der Düsennadelspitze beabstandet zur Having an outer surface, and that extending in the direction of the outer surface extension of the seat portion of the nozzle needle tip to the
Außenfläche verläuft. Eine derartige Ausbildung ermöglicht insbesondere eine vorteilhafte Zustromung von Kraftstoff in dem Bereich von Einspritzöffnungen und stellt darüber hinaus sicher, dass lediglich die Düsennadelspitze, und nicht der Düsennadelschaft in der Schließstellung in Anlage mit der Innenfläche eines Düsenkörpers angeordnet ist. Darüber hinaus kann es auch vorgesehen sein, dass zwischen der Outside surface runs. Such a design allows, in particular, an advantageous inflow of fuel in the region of injection openings and also ensures that only the nozzle needle tip, and not the nozzle needle shaft is arranged in the closed position in contact with the inner surface of a nozzle body. In addition, it may also be provided that between the
Düsennadelspitze und der Aufnahme eine Presssitzpassung ausgebildet ist. Eine Presssitzpassung ist immer dann sinnvoll bzw. erforderlich, wenn sich diese mit Blick auf die Fertigungskosten relativ günstig herstellen lässt (abhängig von den verwendeten Materialien des Düsennadelschafts und der Düsennadelspitze sowie von den Dimensionierungen der Bauteile) und/oder wenn jegliche  Nozzle needle tip and the inclusion of a press fit is formed. An interference fit is always useful or necessary if it can be produced relatively cheap in view of the manufacturing costs (depending on the materials used Düsennadelschafts and the nozzle needle tip and the dimensions of the components) and / or if any
Längsverschiebung der Düsennadelspitze in der Aufnahme des Düsennadelschafts vermieden werden soll, um beispielsweise eine besonders einfache Montage der Düsennadelspitze in dem Kraftstoffinjektor zu ermöglichen oder eine gleichzeitige Öffnung der Einspritzöffnungen mit der Bewegung des Düsennadelschafts sicherzustellen. Longitudinal displacement of the nozzle needle tip in the receptacle of the Düsennadelschafts should be avoided to allow, for example, a particularly simple installation of the nozzle needle tip in the fuel injector or to ensure a simultaneous opening of the injection openings with the movement of the nozzle needle shaft.
Es kann jedoch auch vorgesehen sein, dass zwischen der Düsennadelspitze und der Aufnahme eine Übergangs- oder Spielpassung ausgebildet ist. In diesem Fall wird eine besonders einfache bzw. preiswerte Herstellbarkeit der Bauteile infolge eines relativ großen Toleranzbereichs der Bauteile ermöglicht und darüber hinaus der Montageprozess dahingehend vereinfacht, dass das Einführen der Düsennadelspitze in die Aufnahme des Düsennadelschafts besonders einfach erfolgen kann. However, it can also be provided that a transition or clearance fit is formed between the nozzle needle tip and the receptacle. In this case, a particularly simple or inexpensive manufacturability of the components due to a relatively large tolerance range of the components is made possible and beyond simplifies the assembly process to the effect that the insertion of the nozzle needle tip into the receptacle of the nozzle needle shaft can be particularly easily.
Bei letztgenannter Ausbildung mit einer Übergangs- oder Spielpassung kann es darüber hinaus vorgesehen sein, dass zwischen der Düsennadelspitze und der Aufnahme wenigstens ein Leckagespalt ausgebildet ist. Dieser Leckagespalt kann entweder alleine durch die Toleranzlage der Bauteile bedingt ausgebildet sein, oder aber, bevorzugt, durch eine gezielte Bearbeitung beispielsweise der Düsennadelspitze in Form einer Längsnut o.ä. Eine derartige Ausbildung bewirkt, dass eine zeitlich leicht verzögerte Bewegung zwischen dem Düsennadelschaft und der Düsennadelspitze zum Freigeben von Einspritzöffnungen erfolgt. In the latter embodiment with a transition or clearance fit, it may also be provided that at least one leakage gap is formed between the nozzle needle tip and the receptacle. This leakage gap can either be conditioned solely by the tolerance position of the components, or else, preferably, by a targeted processing, for example, the nozzle needle tip in the form of a longitudinal groove or the like. Such a configuration causes a slightly delayed movement between the nozzle needle shaft and the nozzle needle tip for releasing injection openings.
Die Erfindung umfasst auch eine Kraftstoffeinspritzeinrichtung, mit einem The invention also includes a fuel injector, with a
Gehäuse zur Führung einer erfindungsgemäßen Düsennadel. Housing for guiding a nozzle needle according to the invention.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung. Diese zeigt in: eine teilweise geschnittene Seitenansicht einer erfindungsgemäßen Düsennadel für eine Kraftstoffeinspritzeinrichtung in Form eines Kraftstoffinjektors, Fig. 2 einen Teilbereich der Düsennadel im Bereich der Düsennadelspitze in einem Längsschnitt und Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. 1 shows a partially sectioned side view of a nozzle needle according to the invention for a fuel injector in the form of a fuel injector, Fig. 2 shows a partial region of the nozzle needle in the region of the nozzle needle tip in a longitudinal section and
Fig. 3 einen Teilbereich der Düsennadel gemäß Fig. 1 und 2 in Einbaulage in einem Kraftstoffinjektor in ihrer Schließstellung im Längsschnitt. Fig. 3 shows a portion of the nozzle needle of FIG. 1 and 2 in the installed position in a fuel injector in its closed position in longitudinal section.
Gleiche Elemente bzw. Elemente mit gleicher Funktion sind in den Figuren mit den gleichen Bezugsziffern versehen. In der Fig. 1 ist eine erfindungsgemäße Düsennadel 10 für eine in der Fig. 3 gezeigte Kraftstoffeinspritzeinrichtung 100 in Form eines Kraftstoff! njektors, insbesondere eines Kraftstoffinjektors zur Verwendung bei einer The same elements or elements with the same function are provided in the figures with the same reference numerals. FIG. 1 shows a nozzle needle 10 according to the invention for a fuel injector 100 shown in FIG. 3 in the form of a fuel. Njektors, in particular a fuel injector for use in a
selbstzündenden Brennkraftmaschine, dargestellt. Der Kraftstoffinjektor ist Bestandteil eines sogenannten Common-Rail-Systems, bei dem unter Hochdruck stehender Kraftstoff in den Brennraum einer Brennkraftmaschine eingespritzt wird, wie dies an sich Stand der Technik ist und daher im weiteren Verlauf nicht näher erläutert wird. self-igniting internal combustion engine, shown. The fuel injector is part of a so-called common rail system, is injected at the high-pressure fuel in the combustion chamber of an internal combustion engine, as is prior art and therefore will not be explained in the further course.
Die Düsennadel 10 besteht im Wesentlichen aus zwei separaten Bauteilen, einem Düsennadelschaft 1 1 und einer Düsennadelspitze 12. Der The nozzle needle 10 consists essentially of two separate components, a nozzle needle shaft 1 1 and a nozzle needle tip 12. Der
Düsennadelschaft 1 1 besteht aus einem Vollmaterial, insbesondere aus  Düsennadelschaft 1 1 consists of a solid material, in particular
Maschinenstahl, und ist im Wesentlichen zylinder- bzw. stangenförmig ausgebildet. Der Düsennadelschaft 1 1 weist in einem mittleren Bereich mehrere Führungsabschnitte 13 auf, die dazu dienen, den Düsennadelschaft 1 1 bzw. die Düsennadel 10 in Richtung ihrer Längsachse 14 durch Anlage an der InnenwandMachine steel, and is essentially cylindrical or rod-shaped. The nozzle needle shaft 1 1 has in a central region a plurality of guide portions 13 which serve the nozzle needle shaft 1 1 and the nozzle needle 10 in the direction of its longitudinal axis 14 by contact with the inner wall
16 eines in der Fig. 3 dargestellten Injektorgehäuses 18 radial zu führen. Im Bereich der Führungsabschnitte 13 sind mehrere, insbesondere durch Schleifen ausgebildete, vorzugsweise in gleich großen Winkelabständen zueinander angeordnete ebene Flächen 19 ausgebildet, die dazu dienen, Kraftstoff in Richtung der Düsennadelspitze 12 im Bereich der Innenwand 16 strömen lassen zu können. 16 of an injector shown in FIG. 3 18 to lead radially. In the region of the guide sections 13, a plurality of planar surfaces 19, which are formed in particular by loops and are preferably arranged at equal angular distances from one another, are provided, which serve to allow fuel to flow in the direction of the nozzle needle tip 12 in the region of the inner wall 16.
Der Düsennadelschaft 1 1 weist eine Aufnahme 20 in Form eines Sackloches 21 zur Aufnahme der Düsennadelspitze 12 auf. Das einen konstanten Durchmesser D aufweisende Sackloch 21 weist einen Grund 22 auf, der als Axialanschlag für die Düsennadelspitze 12 in Richtung des der Düsennadelspitze 12 gegenüberliegenden Endes 23 des Düsennadelschafts 1 1 dient. Das Ende 23 taucht beispielhaft in einen nicht dargestellten Steuerraum des Kraftstoffinjektors ein, um die Bewegung der Düsennadel 10 zum Öffnen bzw. SchlieOen von im Injektorgehäuse 18 ausgebildeten Einspritzöffnungen 26 in bekannter Art und Weise zu steuern. The nozzle needle shaft 1 1 has a receptacle 20 in the form of a blind hole 21 for receiving the nozzle needle tip 12. The blind hole 21 having a constant diameter D has a base 22 which serves as an axial stop for the nozzle needle tip 12 in the direction of the nozzle needle tip 12 opposite end 23 of the nozzle needle shaft 1 1 is used. By way of example, the end 23 dips into a control space (not shown) of the fuel injector in order to control the movement of the nozzle needle 10 for opening or closing injection openings 26 formed in the injector housing 18 in a known manner.
Die Düsennadelspitze 12 besteht aus einem anderen Material als der The nozzle needle tip 12 is made of a different material than the
Düsennadelschaft 1 1 , insbesondere aus einem verschleißfesten Material wie Keramik, Hartmetall oder einem Saphir. Die Düsennadelspitze 12 weist zumindest innerhalb der Aufnahme 20 einen zylindrischen Abschnitt 24 mit einem zumindest annähernd konstanten Durchmesser d auf, wobei der Nozzle needle shaft 1 1, in particular of a wear-resistant material such as ceramic, carbide or a sapphire. The nozzle needle tip 12 has at least within the receptacle 20 on a cylindrical portion 24 with an at least approximately constant diameter d, wherein the
Durchmesser d des Abschnitts 24 und der Durchmesser D des Sacklochs 21 derart aufeinander abgestimmt sind, dass vorzugsweise eine Übergangs- oder Spielpassung zwischen der Düsennadelspitze 12 und dem Düsennadelschaft 1 1 ausgebildet ist, und wobei der Durchmesser d gleichzeitig den größten Diameter d of the portion 24 and the diameter D of the blind hole 21 are coordinated such that preferably a transition or clearance fit between the nozzle needle tip 12 and the nozzle needle shaft 1 1 is formed, and wherein the diameter d at the same time the largest
Durchmesser der Düsennadelspitze 12 bildet. Es ist jedoch auch möglich, dass die Durchmesser d, D derart aufeinander abgestimmt sind, dass zwischen der Düsennadelspitze 12 und dem Düsennadelschaft 1 1 eine Presspassung ausgebildet ist. Ferner ist es möglich, dass am Umfang des Abschnitts 24 Leckagenuten o.ä. ausgebildet sind (nicht dargestellt), um einen definierten Durchfluss von Kraftstoff in den Bereich des Grunds 22 des Sackloches 21 zu ermöglichen. Diameter of the nozzle needle tip 12 forms. However, it is also possible that the diameters d, D are coordinated with one another such that an interference fit is formed between the nozzle needle tip 12 and the nozzle needle shaft 11. Furthermore, it is possible that at the periphery of the section 24 leakage grooves or the like. are formed (not shown) to allow a defined flow of fuel in the region of the bottom 22 of the blind hole 21.
An dem zylindrisch ausgebildeten Abschnitt 24 der Düsennadelspitze 12 schließt sich außerhalb der Aufnahme 20 ein konisch ausgebildeter Sitzbereich 25 an. Der Sitzbereich 25 ist dazu ausgebildet, in der in der Fig. 3 dargestellten At the cylindrically shaped portion 24 of the nozzle needle tip 12, a conically formed seating area 25 adjoins the receptacle 20. The seating area 25 is designed to be in the position shown in FIG
Schließstellung der Düsennadel 10 die Einspritzöffnungen 26 zu verschließen. Hierzu liegt der Sitzbereich 25 dichtend an der Innenwand 16 des Closed position of the nozzle needle 10 to close the injection openings 26. For this purpose, the seating area 25 sealingly against the inner wall 16 of the
Injektorgehäuses 18 an. Injector housing 18 on.
Der Düsennadelschaft 1 1 weist im Mündungsbereich der Aufnahme 20 bzw. des Sackloches 21 eine konisch ausgebildete Außenfläche 28 auf. Eine in The nozzle needle shaft 1 1 has a conical outer surface 28 in the mouth region of the receptacle 20 and the blind hole 21. An in
Verlängerung des Sitzbereichs 25 ausgebildete Gerade 29 verläuft mit Abstand zum Außenumfang 28 des Düsennadelschafts 1 1. Für den Fall, dass zwischen der Düsennadelspitze 12 und dem Düsennadelschaft 1 1 im Bereich der Aufnahme 20 eine Übergangs- bzw. Extension of the seat portion 25 formed straight line 29 extends at a distance from the outer periphery 28 of the nozzle needle shaft 1 first In the event that between the nozzle needle tip 12 and the nozzle needle shaft 1 1 in the region of the receptacle 20 is a transition or
Spielpassung ausgebildet ist, kann Kraftstoff in den Bereich zwischen dem Grund 22 des Sackloches 21 und der dem Grund 22 zugewandten Stirnfläche der Düsennadelspitze 12 gelangen. Beim Öffnen der Düsennadel 10 aus der in der Fig. 3 dargestellten Schließstellung zum Freigeben der Einspritzöffnungen 26 beginnt im ersten Augenblick der Düsennadelschaft 1 1 sich zu bewegen, derart, dass zwischen dem Grund 22 des Sacklochs 21 und der Düsennadelspitze 12 ein Axialspalt 30 entsteht, der im Bereich weniger Mikrometer liegt. Anschließend beginnt auch die Düsennadelspitze 12 von ihrem Dichtsitz sich zu entfernen, um die Einspritzöffnungen 26 freizugeben. Fit is formed, fuel can reach into the region between the bottom 22 of the blind hole 21 and the bottom 22 facing the end face of the nozzle needle tip 12. When opening the nozzle needle 10 from the closed position shown in FIG. 3 for releasing the injection openings 26, the nozzle needle shaft 1 1 begins to move at the first instant, such that an axial gap 30 arises between the bottom 22 of the blind hole 21 and the nozzle needle tip 12, which is in the range of a few micrometers. Subsequently, the nozzle needle tip 12 also begins to move away from its sealing seat in order to release the injection openings 26.
Wesentlich ist auch, dass die infolge des Kraftstoffdrucks in dem Injektorgehäuse 18 auf die Düsennadelspitze 12 hydraulisch wirksame Kraft in Öffnungsrichtung der Düsennadel 10 stets größer ist als die hydraulisch wirksame Kraft auf den Düsennadelschaft 1 1 , so dass die Düsennadelspitze 12 stets in Richtung des Grunds 22 des Sacklochs 21 kraftbeaufschlagt ist. It is also essential that due to the fuel pressure in the injector 18 on the nozzle needle tip 12 hydraulically effective force in the opening direction of the nozzle needle 10 is always greater than the hydraulically effective force on the nozzle needle shaft 1 1, so that the nozzle needle tip 12 always in the direction of the bottom 22nd the blind hole 21 is subjected to force.
Die soweit beschriebene Düsennadel 10 bzw. das Kraftstoffeinspritzsystem 100 können in vielfältiger Art und Weise abgewandelt bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen. The nozzle needle 10 or the fuel injection system 100 described so far can be modified or modified in many ways without deviating from the idea of the invention.

Claims

Ansprüche claims
1 . Düsennadel (10) für eine Kraftstoffeinspritzeinrichtung (100), insbesondere einen Kraftstoffinjektor, mit einer Düsennadelspitze (12), die mit einem Düsennadelschaft (1 1 ) verbunden ist, wobei die Düsennadelspitze (12) und der Düsennadelschaft (1 1 ) aus unterschiedlichen Materialien bestehen, dadurch gekennzeichnet, dass der Düsennadelschaft (1 1 ) eine durch eine Sacklochbohrung (21 ) gebildete Aufnahme (20) für die Düsennadelspitze (12) aufweist, wobei der Grund (22) der Aufnahme (20) einen Axialanschlag für die Düsennadelspitze (12) ausbildet, und dass die Düsennadelspitze (12) innerhalb der Aufnahme (20) einen zumindest annähernd konstanten Durchmesser (d) aufweist, der gleichzeitig den größten Durchmesser der Düsennadelspitze (12) ausbildet. 1 . Nozzle needle (10) for a fuel injector (100), in particular a fuel injector, with a nozzle needle tip (12) which is connected to a nozzle needle shaft (1 1), wherein the nozzle needle tip (12) and the nozzle needle shaft (1 1) consist of different materials , characterized in that the nozzle needle shaft (1 1) has a receptacle (20) for the nozzle needle tip (12) formed by a blind bore (21), the base (22) of the receptacle (20) providing an axial stop for the nozzle needle tip (12). forms, and that the nozzle needle tip (12) within the receptacle (20) has an at least approximately constant diameter (d), which simultaneously forms the largest diameter of the nozzle needle tip (12).
2. Düsennadel nach Anspruch 1 , 2. nozzle needle according to claim 1,
dadurch gekennzeichnet,  characterized,
dass die Düsennadelspitze (12) aus einem verschleißfesten Material wie Keramik, Hartmetall oder einem Saphir und der Düsennadelschaft (1 1 ) aus einem Vollmaterial aus Stahl besteht.  in that the nozzle needle tip (12) consists of a wear-resistant material such as ceramic, hard metal or a sapphire and the nozzle needle shaft (11) consists of a solid material made of steel.
3. Düsennadel nach Anspruch 1 oder 2, 3. nozzle needle according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
dass die in Richtung des Grunds (22) der Aufnahme (20) hydraulisch wirkende Fläche der Düsennadelspitze (12) größer ist als die in die gleiche Richtung wirkende hydraulische Fläche des Düsennadelschafts (1 1 ), so dass die Düsennadelspitze (12) stets in Richtung des Grunds (22) der Aufnahme (20) kraftbeaufschlagt ist.  in that the surface of the nozzle needle tip (12) which acts hydraulically in the direction of the base (22) of the receptacle (20) is larger than the hydraulic surface of the nozzle needle shaft (11) acting in the same direction, so that the nozzle needle tip (12) always points in the direction the bottom (22) of the receptacle (20) is subjected to force.
4. Düsennadel nach einem der Ansprüche 1 bis 3, 4. nozzle needle according to one of claims 1 to 3,
dadurch gekennzeichnet, dass die Düsennadelspitze (12) einen konisch geformten Sitzbereich (25) aufweist, der sich an einen zylindrisch ausgebildeten Abschnitt (24) innerhalb der Aufnahme (20) anschließt. characterized, in that the nozzle needle tip (12) has a conically shaped seating area (25) which adjoins a cylindrically shaped section (24) within the receptacle (20).
5. Düsennadel nach Anspruch 4, 5. nozzle needle according to claim 4,
dadurch gekennzeichnet,  characterized,
dass der Düsennadelschaft (1 1 ) im Mündungsbereich der Aufnahme (20) eine konische Außenfläche (28) aufweist, und dass eine in Richtung der Außenfläche (28) verlaufende Verlängerung (29) des Sitzbereichs (25) beabstandet zur Außenfläche (28) verläuft.  in that the nozzle needle shaft (11) has a conical outer surface (28) in the mouth region of the receptacle (20), and that an extension (29) of the seat region (25) extending in the direction of the outer surface (28) extends at a distance from the outer surface (28).
6. Düsennadel nach einem der Ansprüche 1 bis 5, 6. nozzle needle according to one of claims 1 to 5,
dadurch gekennzeichnet,  characterized,
dass zwischen der Düsennadelspitze (12) und der Aufnahme (20) eine Presssitzpassung ausgebildet ist.  in that a press fit is formed between the nozzle needle tip (12) and the receptacle (20).
7. Düsennadel nach einem der Ansprüche 1 bis 5, 7. nozzle needle according to one of claims 1 to 5,
dadurch gekennzeichnet,  characterized,
dass zwischen der Düsennadelspitze (12) und der Aufnahme (20) eine Übergangs- oder Spielpassung ausgebildet ist.  in that a transition or clearance fit is formed between the nozzle needle tip (12) and the receptacle (20).
8. Düsennadel nach Anspruch 7, 8. nozzle needle according to claim 7,
dadurch gekennzeichnet,  characterized,
dass zwischen der Düsennadelspitze (12) und der Aufnahme (20) wenigstens ein Leckagespalt ausgebildet ist.  in that at least one leakage gap is formed between the nozzle needle tip (12) and the receptacle (20).
9. Kraftstoffeinspritzeinrichtung (100), mit einem Gehäuse (18) zur Führung einer Düsennadel (10), wobei die Düsennadel (10) nach einem der Ansprüche 1 bis 8 ausgebildet ist. 9. Fuel injection device (100), with a housing (18) for guiding a nozzle needle (10), wherein the nozzle needle (10) is designed according to one of claims 1 to 8.
EP15744224.5A 2014-09-08 2015-07-30 Nozzle needle for a fuel injection device, and fuel injection device Active EP3191706B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014217935.1A DE102014217935A1 (en) 2014-09-08 2014-09-08 Nozzle needle for a fuel injector and fuel injector
PCT/EP2015/067483 WO2016037761A1 (en) 2014-09-08 2015-07-30 Nozzle needle for a fuel injection device, and fuel injection device

Publications (2)

Publication Number Publication Date
EP3191706A1 true EP3191706A1 (en) 2017-07-19
EP3191706B1 EP3191706B1 (en) 2018-06-13

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ID=53761396

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Application Number Title Priority Date Filing Date
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Country Link
US (1) US20170260949A1 (en)
EP (1) EP3191706B1 (en)
DE (1) DE102014217935A1 (en)
WO (1) WO2016037761A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3236046C2 (en) * 1982-09-29 1986-03-20 Daimler-Benz Ag, 7000 Stuttgart Fuel injector for internal combustion engines
US5409165A (en) * 1993-03-19 1995-04-25 Cummins Engine Company, Inc. Wear resistant fuel injector plunger assembly
DE69922087T2 (en) * 1998-06-24 2005-12-01 Delphi Technologies, Inc., Troy fuel injector
GB9913314D0 (en) 1999-06-09 1999-08-11 Lucas Ind Plc Fuel injector
DE102004028617A1 (en) 2004-06-12 2005-12-29 Robert Bosch Gmbh nozzle needle
DE102008041165A1 (en) * 2008-08-11 2010-02-18 Robert Bosch Gmbh Injection valve member

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US20170260949A1 (en) 2017-09-14
DE102014217935A1 (en) 2016-03-10
WO2016037761A1 (en) 2016-03-17

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