EP3191706B1 - Nozzle needle for a fuel injection device, and fuel injection device - Google Patents
Nozzle needle for a fuel injection device, and fuel injection device Download PDFInfo
- Publication number
- EP3191706B1 EP3191706B1 EP15744224.5A EP15744224A EP3191706B1 EP 3191706 B1 EP3191706 B1 EP 3191706B1 EP 15744224 A EP15744224 A EP 15744224A EP 3191706 B1 EP3191706 B1 EP 3191706B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle needle
- needle tip
- receptacle
- tip
- nozzle
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—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
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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
- 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 fuel injection device using a nozzle needle according to the invention.
- a generic nozzle needle is from the DE 10 2004 028 617 A1 the 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.
- 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.
- DE102008041165 also shows a nozzle needle wherein the attachment of the nozzle needle tip to the nozzle needle shaft cohesively, positively or non-positively.
- 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, forming 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.
- the production of a different shapes or diameter having nozzle needle tip in the event that it consists of sintered metal relatively easy, the formation of a nozzle needle tip of a different material or by means of another manufacturing technique in which a blank is shaped accordingly or . must be machined, but is relatively expensive.
- a nozzle needle is known 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 to be movable in the axial direction of the nozzle needle shaft, wherein a sleeve likewise arranged in the nozzle needle shaft in the region of the recess limits the stroke of the nozzle needle tip in the direction of the injection openings of the fuel injector.
- the nozzle needle known from the cited document makes it possible, by pressurizing with the fuel pressure in the recess on the rear side of the nozzle needle tip, to move the nozzle needle tip to the nozzle needle shaft in a timely manner in order to open or close in time injection openings formed, for example, at different regions of a nozzle body ,
- the nozzle needle is designed relatively expensive.
- the invention has the object, a nozzle needle for a fuel injector, in particular a fuel injector, according to the preamble of claim 1 such that a structurally simplified and manufacturing technology particularly advantageous embodiment of the nozzle needle is achieved.
- a nozzle needle for a fuel injection device with the features of claim 1 solved that the nozzle needle shaft has a formed by a blind hole receiving the nozzle needle tip, the reason of 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.
- 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.
- the area of the nozzle needle tip which acts hydraulically in the direction of the bottom of the nozzle needle shaft is larger than the hydraulic surface of the nozzle needle shaft acting in the same direction.
- Such a design causes 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 recording of the nozzle needle shaft.
- Such a design makes it possible in particular to dispense with a press fit between the nozzle needle shaft and the nozzle needle tip, so that the components are relatively inexpensive to produce due to the lower tolerance requirements.
- this consists of a wear-resistant material such as ceramic, hard metal or a sapphire and the nozzle needle shaft of a solid material made of steel.
- a wear-resistant material such as ceramic, hard metal or a sapphire
- the nozzle needle shaft of a solid material made of steel.
- the nozzle needle tip has a conically shaped seating area, which adjoins directly to the arranged inside the receptacle, cylindrically shaped region of the nozzle needle tip.
- the nozzle needle shaft in the mouth region of the receptacle has a conical outer surface, and that extending in the direction of the outer surface extension of the seat portion of the nozzle needle tip spaced from the outer surface.
- 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 injection device with a housing for guiding a nozzle needle according to the invention.
- a nozzle needle 10 according to the invention for a in the Fig. 3 shown fuel injector 100 in the form of a fuel injector, in particular a fuel injector for use in a 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.
- the nozzle needle 10 consists essentially of two separate components, a nozzle needle shaft 11 and a nozzle needle tip 12.
- the nozzle needle shaft 11 consists of a solid material, in particular of machine steel, and is substantially cylindrical or rod-shaped.
- the nozzle needle shaft 11 has a plurality of guide portions 13 in a central region, which serve to the nozzle needle shaft 11 and the nozzle needle 10 in the direction of its longitudinal axis 14 by abutment against the inner wall 16 of the in Fig. 3 shown injector 18 to lead radially.
- the nozzle needle shaft 11 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 11 is used.
- the end 23 dips by way of example into a control space of the fuel injector, not shown, in order to control the movement of the nozzle needle 10 for opening or closing of 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 11, 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 11 is formed, and wherein the diameter d at the same time forms the largest diameter of the nozzle needle tip 12.
- the diameters d, D are matched to one another such that an interference fit is formed between the nozzle needle tip 12 and the nozzle needle shaft 11.
- 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.
- a conically formed seating area 25 adjoins the receptacle 20.
- the seating area 25 is designed to be in the in the Fig. 3 illustrated closed position of the nozzle needle 10 to close the injection openings 26.
- the seating area 25 bears sealingly against the inner wall 16 of the injector housing 18.
- the nozzle needle shaft 11 has a conically shaped outer surface 28 in the mouth region of the receptacle 20 or the blind hole 21.
- a trained in extension of the seat portion 25 straight line 29 extends at a distance from the outer periphery 28 of the nozzle needle shaft 11th
- nozzle needle 10 or the fuel injection system 100 described so far can be varied or modified in many ways without deviating from the inventive concept, as defined in the appended claims.
Description
Die Erfindung betrifft eine Düsennadel für eine Kraftstoffeinspritzeinrichtung nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung eine Kraftstoffeinspritzeinrichtung unter Verwendung einer erfindungsgemäßen Düsennadel.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 fuel injection device using a nozzle needle according to the invention.
Eine gattungsgemäße Düsennadel ist aus der
Weiterhin ist aus der
Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Düsennadel für eine Kraftstoffeinspritzeinrichtung, insbesondere einen Kraftstoffinjektor, nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass eine konstruktiv vereinfachte und herstellungstechnisch besonders vorteilhafte Ausgestaltung der Düsennadel erzielt wird.Based on the illustrated prior art, the invention has the object, a nozzle needle for a fuel injector, in particular a fuel injector, according to the preamble of claim 1 such that a structurally simplified and manufacturing technology particularly advantageous embodiment of the nozzle needle is achieved.
Diese Aufgabe wird erfindungsgemäß bei einer Düsennadel für eine Kraftstoffeinspritzeinrichtung mit den Merkmalen des Anspruchs 1 dadurch gelöst, dass der Düsennadelschaft eine durch eine Sacklochbohrung 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 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.This object is achieved according to the invention in a nozzle needle for a fuel injection device with the features of claim 1 solved that the nozzle needle shaft has a formed by a blind hole receiving the nozzle needle tip, the reason of 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 the 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, not by a frictional connection must be formed, but solely by the geometric design of the recording 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.
Erfindungsgemäß ist es weiter vorgesehen, die in Richtung des Grunds der Aufnahme des Düsennadelschafts hydraulisch wirkende Fläche der Düsennadelspitze größer auszubilden als die in die gleiche Richtung wirkende 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 der Düsennadelspitze zu verzichten, so dass die Bauteile infolge der geringeren Toleranzanforderungen relativ preiswert herstellbar sind.According to the invention, it is further provided that the area of the nozzle needle tip which acts hydraulically in the direction of the bottom of the nozzle needle shaft is larger than the hydraulic surface of the nozzle needle shaft acting in the same direction. Such a design causes 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 recording of the nozzle needle shaft. Such a design makes it possible in particular to dispense with a press fit between the nozzle needle shaft and the nozzle needle tip, so that the components are relatively inexpensive to produce due to the lower tolerance requirements.
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 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 Öffnungszeitpunkte infolge eines relativ geringen Verschleißes bzw. einer relativ geringen geometrischen Veränderung der Düsennadelspitze aufweist.In a particularly preferred embodiment of the nozzle needle tip, this consists of a wear-resistant material such as ceramic, hard metal or a sapphire and the nozzle needle shaft of a solid material made of steel. Such 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, considered over the entire lifetime at least largely constant closing and opening times due to a relatively low wear or a relatively small geometric change of the nozzle needle tip.
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 particular, it is further provided that the nozzle needle tip has a conically shaped seating area, which adjoins directly to the arranged inside the receptacle, cylindrically shaped region 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 weiterhin konstruktiv bevorzugter Ausgestaltung ist es vorgesehen, dass der Düsennadelschaft im Mündungsbereich der Aufnahme eine konische Außenfläche aufweist, und dass eine in Richtung der Außenfläche verlaufende Verlängerung des Sitzbereichs der Düsennadelspitze beabstandet zur Außenfläche verläuft. Eine derartige Ausbildung ermöglicht insbesondere eine vorteilhafte Zuströmung 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.In a further constructively preferred embodiment, it is provided that the nozzle needle shaft in the mouth region of the receptacle has a conical outer surface, and that extending in the direction of the outer surface extension of the seat portion of the nozzle needle tip spaced from the outer surface. Such a design allows in particular an advantageous inflow of fuel in the region of injection openings and moreover 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.
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 Gehäuse zur Führung einer erfindungsgemäßen Düsennadel.The invention also includes a fuel injection device with a 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.Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing.
Diese zeigt in:
- Fig. 1
- 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
- Fig. 3
- einen Teilbereich der Düsennadel gemäß
Fig. 1 und2 in Einbaulage in einem Kraftstoffinjektor in ihrer Schließstellung im Längsschnitt.
- Fig. 1
- a partially sectioned side view of a nozzle needle according to the invention for a fuel injection device in the form of a fuel injector,
- Fig. 2
- a portion of the nozzle needle in the region of the nozzle needle tip in a longitudinal section and
- Fig. 3
- a portion of the nozzle needle according to
Fig. 1 and2 in installation 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.The same elements or elements with the same function are provided in the figures with the same reference numerals.
In der
Die Düsennadel 10 besteht im Wesentlichen aus zwei separaten Bauteilen, einem Düsennadelschaft 11 und einer Düsennadelspitze 12. Der Düsennadelschaft 11 besteht aus einem Vollmaterial, insbesondere aus Maschinenstahl, und ist im Wesentlichen zylinder- bzw. stangenförmig ausgebildet. Der Düsennadelschaft 11 weist in einem mittleren Bereich mehrere Führungsabschnitte 13 auf, die dazu dienen, den Düsennadelschaft 11 bzw. die Düsennadel 10 in Richtung ihrer Längsachse 14 durch Anlage an der Innenwand 16 eines in der
Der Düsennadelschaft 11 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 11 dient. Das Ende 23 taucht beispielhaft in einen nicht dargestellten Steuerraum des Kraftstoffinjektors ein, um die Bewegung der Düsennadel 10 zum Öffnen bzw. Schlie0en von im Injektorgehäuse 18 ausgebildeten Einspritzöffnungen 26 in bekannter Art und Weise zu steuern.The
Die Düsennadelspitze 12 besteht aus einem anderen Material als der Düsennadelschaft 11, 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 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 11 ausgebildet ist, und wobei der Durchmesser d gleichzeitig den größten 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 11 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.The
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
Der Düsennadelschaft 11 weist im Mündungsbereich der Aufnahme 20 bzw. des Sackloches 21 eine konisch ausgebildete Außenfläche 28 auf. Eine in Verlängerung des Sitzbereichs 25 ausgebildete Gerade 29 verläuft mit Abstand zum Außenumfang 28 des Düsennadelschafts 11.The
Für den Fall, dass zwischen der Düsennadelspitze 12 und dem Düsennadelschaft 11 im Bereich der Aufnahme 20 eine Übergangs- bzw. 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
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 11, 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
Die soweit beschriebene Düsennadel 10 bzw. das Kraftstoffeinspritzsystem 100 können in vielfältiger Art und Weise abgewandelt bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen, wie in den beigefügten Ansprüchen definiert.The
Claims (7)
- Nozzle needle (10) for a fuel injection device (100), in particular a fuel injector, having a nozzle needle tip (12) which is connected to a nozzle needle shank (11), wherein the nozzle needle tip (12) and the nozzle needle shank (11) are composed of different materials,
wherein
the nozzle needle shank (11) has a receptacle (20), formed by a blind bore (21), for the nozzle needle tip (12), wherein the base (22) of the receptacle (20) forms an axial stop for the nozzle needle tip (12), and in that the nozzle needle tip (12) has, within the receptacle (20), an at least approximately constant diameter (d) which simultaneously forms the largest diameter of the nozzle needle tip (12),
characterized
in that that surface of the nozzle needle tip (12) which acts hydraulically in the direction of the base (22) of the receptacle (20) is larger than that hydraulic surface of the nozzle needle shank (11) which acts in the same direction, such that the nozzle needle tip (12) is subjected to force in the direction of the base (22) of the receptacle (20) at all times. - Nozzle needle according to Claim 1,
characterized
in that the nozzle needle tip (12) is composed of a wear-resistant material such as ceramic, hard metal or a sapphire, and the nozzle needle shank (11) is composed of a solid material composed of steel. - Nozzle needle according to either of Claims 1 and 2,
characterized
in that the nozzle needle tip (12) has a conically shaped seat region (25) which adjoins a section (24) of cylindrical form within the receptacle (20) . - Nozzle needle according to Claim 3,
characterized
in that the nozzle needle shank (11) has a conical outer surface (28) in the mouth region of the receptacle (20), and in that an elongation (29) of the seat region (25) running in the direction of the outer surface (28) runs spaced apart from the outer surface (28). - Nozzle needle according to one of Claims 1 to 4,
characterized
in that a transition or clearance fit is formed between the nozzle needle tip (12) and the receptacle (20). - Nozzle needle according to Claim 5,
characterized
in that at least one leakage gap is formed between the nozzle needle tip (12) and the receptacle (20) . - Fuel injection device (100), having a housing (18) for guiding a nozzle needle (10), wherein the nozzle needle (10) is designed according to one of Claims 1 to 6.
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 EP3191706A1 (en) | 2017-07-19 |
EP3191706B1 true EP3191706B1 (en) | 2018-06-13 |
Family
ID=53761396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15744224.5A Active EP3191706B1 (en) | 2014-09-08 | 2015-07-30 | Nozzle needle for a fuel injection device, and fuel injection device |
Country Status (4)
Country | Link |
---|---|
US (1) | US20170260949A1 (en) |
EP (1) | EP3191706B1 (en) |
DE (1) | DE102014217935A1 (en) |
WO (1) | WO2016037761A1 (en) |
Family Cites Families (6)
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 |
-
2014
- 2014-09-08 DE DE102014217935.1A patent/DE102014217935A1/en not_active Withdrawn
-
2015
- 2015-07-30 EP EP15744224.5A patent/EP3191706B1/en active Active
- 2015-07-30 US US15/509,256 patent/US20170260949A1/en not_active Abandoned
- 2015-07-30 WO PCT/EP2015/067483 patent/WO2016037761A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP3191706A1 (en) | 2017-07-19 |
US20170260949A1 (en) | 2017-09-14 |
DE102014217935A1 (en) | 2016-03-10 |
WO2016037761A1 (en) | 2016-03-17 |
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