EP3149321A1 - Nozzle assembly for a fuel injector, and fuel injector - Google Patents

Nozzle assembly for a fuel injector, and fuel injector

Info

Publication number
EP3149321A1
EP3149321A1 EP15714533.5A EP15714533A EP3149321A1 EP 3149321 A1 EP3149321 A1 EP 3149321A1 EP 15714533 A EP15714533 A EP 15714533A EP 3149321 A1 EP3149321 A1 EP 3149321A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
nozzle assembly
nozzle
throttle
assembly according
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
EP15714533.5A
Other languages
German (de)
French (fr)
Other versions
EP3149321B1 (en
Inventor
Andreas Koeninger
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 EP3149321A1 publication Critical patent/EP3149321A1/en
Application granted granted Critical
Publication of EP3149321B1 publication Critical patent/EP3149321B1/en
Not-in-force 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a nozzle assembly for a fuel injector for the fuel injector
  • the invention relates to a fuel injector with such a nozzle assembly.
  • Nozzle body includes liftably received nozzle needle.
  • Nozzle needle is acted upon in the closing direction by the spring force of a closing spring which is supported on the one hand on a body component of the fuel injector and on the other hand on a throttle bore body which surrounds the nozzle needle in regions.
  • the throttle bore body in turn is supported on a shoulder of the nozzle needle.
  • In the throttle bore body at least one throttle bore is formed, which serves as a closing throttle and the
  • High-pressure bore in a first and a second portion separates.
  • the throttle bore body surrounding the nozzle needle in some regions has a hydraulically effective area Ai delimiting the first partial area, which is larger is a hydraulically effective area A 2 delimiting the second subarea.
  • the throttle bore body of DE 10 2011 076 665 A1 surrounding the nozzle needle is pressed against a shoulder of the nozzle needle via the spring force of the closing spring and the additionally acting hydraulic pressure force, so that a high sealing effect is provided in the contact region.
  • bypass leakage paths may arise which have the effect of at least one
  • the present invention has for its object to provide a nozzle assembly with a closing throttle, which is optimized efficiency. Furthermore, the nozzle assembly should be simple and inexpensive to produce.
  • the nozzle assembly proposed for a fuel injector includes a nozzle needle which is liftable in a high pressure bore of a nozzle body for releasing and closing at least one injection port
  • the nozzle needle is surrounded in regions by a throttle bore body which, according to the invention, is designed in several parts and comprises at least two sleeves which are guided into one another at least in regions.
  • the merging of the sleeves displaces the leak-prone guide area radially inward, so that already reduces the leakage through the reduced guide diameter becomes.
  • an annular gap which allows a floating in the radial direction storage of the sleeves.
  • the floating mounting in the radial direction allows the compensation of manufacturing and / or assembly tolerances, in particular, an axial offset of the nozzle needle longitudinal axis can be compensated with respect to a sealing seat.
  • the annular gap between the sleeves and the nozzle body causes the pressure p 2 to be applied radially outward and the pressure pi to be radially inward. Since p 2 is smaller than pi, the sleeves are pressed against each other in the radial direction, so that in this way the leakage in the region of the guide is further reduced.
  • the guide clearance between the two sleeves can be minimized in a simple manner to keep the leakage as low as possible and to increase the efficiency of the closing throttle.
  • the closing throttle is formed in the sleeve, which is arranged closer to the injection opening.
  • Hydraulic volume of the second portion of the high-pressure bore is reduced or the mechanical power transmission can be shortened, which has a favorable effect on the response of the moving components and thus promotes a fast needle closing.
  • an axially or obliquely extending bore in the sleeve is provided to form the closing throttle. This measure serves to optimize the flow in the area of the closing throttle.
  • the sleeve which is arranged closer to the injection opening, formed substantially pot-shaped. That is, it has a bottom portion and a hollow cylindrical portion attached thereto. It is also proposed that the sleeve, which is arranged closer to the injection opening, at least partially surrounds the further sleeve. This means that the cup-shaped sleeve guides the further sleeve, wherein the pressure p 2 rests on the inner peripheral side on the further sleeve and the pressure p 2 on the outer peripheral side against the cup-shaped sleeve. The pressure difference leads to a radial expansion of the guided sleeve, so that the guide clearance between the two sleeves is minimized.
  • the sleeve which is arranged closer to the injection opening, is supported in the axial direction on a preferably annular shoulder of the nozzle needle.
  • the nozzle needle can be stepped and / or composed of several parts with different outer diameters.
  • the sleeve in turn, preferably has a support surface resting against the shoulder, which may be formed, for example, on a bottom region of a pot-shaped sleeve. The sleeve engages behind the nozzle needle.
  • the pressure difference in the two subspaces of the high-pressure bore causes a hydraulic pressure force in the axial direction, by means of which at the
  • Nozzle needle supported sleeve is pressed against the shoulder of the nozzle needle.
  • the hydraulic active surface of the sleeve supported on the nozzle needle can be made larger than the hydraulic active surface facing the second partial region of the high-pressure bore.
  • the sleeve is acted upon in the direction of the preferably annular shoulder of the nozzle needle by the spring force of the spring whose spring force acts on the nozzle needle in the closing direction.
  • the sleeve thus replaces a trained on the nozzle needle or connected to the nozzle needle spring plate.
  • the spring is supported on an annular end face of the sleeve.
  • annular space is formed between the nozzle needle and the further sleeve, which is arranged less close to the injection opening.
  • the annulus allows fuel flow in the direction of at least one
  • the further sleeve has a collar section for
  • the collar portion preferably extends radially outward.
  • the collar portion can serve in this way as a spring plate for supporting the spring, the spring force of the nozzle needle, preferably indirectly via the supported on the nozzle needle other sleeve, in
  • the sleeve is radially floating in the high-pressure bore mounted to compensate for any manufacturing and / or assembly tolerances.
  • the floating bearing in the radial direction can be realized in a simple manner on the collar portion of the sleeve for housing-side support.
  • the nozzle needle is stepped.
  • the stepped design simplifies the formation of an annular shoulder for supporting a sleeve of the multi-part throttle body.
  • the nozzle needle preferably has a reduced outer diameter in the region of a section surrounded by the throttle bore body. This ensures that a sleeve supported on this shoulder is pressed against the shoulder via the hydraulic pressure force additionally acting in the closing direction in the flow direction of the fuel.
  • the multi-part throttle bore body may be such that the sleeves cooperate to form a stroke stop.
  • Stroke limit limits the stroke of the nozzle needle, which also has an advantageous effect on a fast needle closing.
  • a first stop surface for example, a bottom surface of a pot-shaped first sleeve and serve as a second stop surface, an annular end face of a guided in the first sleeve second sleeve.
  • the multipart throttle bore body is preferably via one of its sleeves on a body part of the
  • Fuel injector for example, a holding body or an intermediate plate, supported.
  • the body component is plate-shaped and has a central recess for receiving the nozzle needle or a pressure pin which can be coupled to the nozzle needle.
  • the central recess in the body component at the same time serves as an inlet channel.
  • the recess preferably has an inner diameter that is larger than the outer diameter of the nozzle needle or of the pressure pin in this area.
  • the illustrated nozzle assembly comprises a nozzle needle 1, which is received in a liftable manner in a high-pressure bore 2 of a nozzle body 3.
  • a nozzle needle 1 About the lifting movement of the nozzle needle 1 is at least one injection port 4 can be opened and closed. When the injection opening 4 is released, high-pressure fuel enters a combustion chamber of an internal combustion engine
  • the nozzle needle 1 is acted upon by the spring force of a spring 5, which on the one hand on a collar portion 10 of a first sleeve 7.1 and on the other hand on an annular end face 14 of a cup-shaped second sleeve 7 of a multipart executed
  • Throttle bore body 7 is supported.
  • the cup-shaped second sleeve 7.2 is a through a bottom portion 15 of the sleeve 7.2 obliquely
  • Throttle bore formed as a closing throttle 6, which is part of the flow path of the fuel to be injected.
  • the closing throttle 6 causes the Hydraulic pressure pi in a first portion 2.1 of the high pressure bore 2 is greater than the hydraulic pressure p 2 in a second portion 2.2 of the high pressure bore 2 is. The pressure difference in turn leads to a
  • Closing direction acting hydraulic force which acts on the pot-shaped sleeve 7.2 and indirectly via the cup-shaped sleeve 7.2, the nozzle needle 1.
  • the hydraulic force, together with the spring force of the spring 5 causes a quick needle closing.
  • the pot-shaped sleeve 7.2 is for this purpose on an annular shoulder 8 of
  • Paragraph 8 axially biased. The spring force of the spring 5 and the in
  • Closing direction acting hydraulic force cause a sealing force, which largely prevents leakage in the contact region 16 of the sleeve 7.2 with the nozzle needle 1.
  • the pot-shaped sleeve 7.2 surrounds the further sleeve 7.1 of the multi-part
  • Drosselbohrungs stresses 7 partially, so that it is guided over the cup-shaped sleeve 7.2.
  • the guide region 17 represents a further contact area that is usually leaking.
  • the present case the
  • Sleeve 7.1 is flowed through by the fuel to be injected, an annular space 9 is formed between the sleeve 7.1 and the nozzle needle 1, which is part of the flow path of the fuel to be injected. Another leak-tight sealing point is the
  • Bund section 10 of the sleeve 7.1 is supported, the spring force of the spring 5 presses the sleeve 7.1 against the body member 11.
  • the spring force of the spring 5 presses the sleeve 7.1 against the body member 11.
  • the end face of the sleeve 7.1 forms in the present case at the same time a stroke stop 13, when the needle 7.2, the sleeve 7.2 reaches over its bottom portion 15 in contact with serving as a stroke stop 13 face of the sleeve 7.1.
  • the nozzle needle 1 of the illustrated nozzle assembly is stepped and has a portion 12 with reduced outer diameter for receiving the multi-part throttle body 7 and the formation of the annular shoulder 8, on which the cup-shaped sleeve 7.2 of the throttle body 7 is supported.
  • the fuel to be injected flows at this section 12 of the
  • Nozzle needle 1 over in the direction of the closing throttle 6 and passes through the closing throttle 6 in the second portion 2.2 of the high-pressure bore 2.
  • the flow direction of the fuel is indicated by the arrows 19.

Abstract

The invention relates to a nozzle assembly for a fuel injector, comprising a nozzle needle (1), which is accommodated in a high-pressure bore (2) of a nozzle body (3) in such a way that the nozzle needle can be moved in a reciprocating manner in order to open and close at least one injection opening (4) and to which a spring force of a spring (5) is applied at least indirectly in a closing direction, wherein the nozzle needle (1) is surrounded by a throttle bore body (7) at least in some regions in order to form at least one closing throttle (6). According to the invention, the throttle bore body (7) has a multi-part design and comprises at least two sleeves (7.1, 7.2), which are guided in each other at least in some regions. The invention further relates to a fuel injector comprising such a nozzle assembly.

Description

Beschreibung Titel:  Description Title:
Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor Die Erfindung betrifft eine Düsenbaugruppe für einen Kraftstoffinjektor zum The invention relates to a nozzle assembly for a fuel injector for the fuel injector
Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung einen Kraftstoffinjektor mit einer solchen Düsenbaugruppe. Stand der Technik Injecting fuel into the combustion chamber of an internal combustion engine having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly. State of the art
Aus der Offenlegungsschrift DE 10 2011 076 665 AI ist eine Düsenbaugruppe für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine bekannt, welche zum Freigeben und Verschließen wenigstens einer Einspritzöffnung eine in einer Hochdruckbohrung eines From the published patent application DE 10 2011 076 665 AI a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine is known which for releasing and closing at least one injection opening in a high-pressure bore of a
Düsenkörpers hubbeweglich aufgenommene Düsennadel umfasst. Die  Nozzle body includes liftably received nozzle needle. The
Düsennadel ist in Schließrichtung von der Federkraft einer Schließfeder beaufschlagt, die einerseits an einem Körperbauteil des Kraftstoffinjektors und andererseits an einem Drosselbohrungskörper abgestützt ist, der die Düsennadel bereichsweise umgibt. Der Drosselbohrungskörper wiederum stützt sich an einem Absatz der Düsennadel ab. Im Drosselbohrungskörper ist wenigstens eine Drosselbohrung ausgebildet, die als Schließdrossel dient und die Nozzle needle is acted upon in the closing direction by the spring force of a closing spring which is supported on the one hand on a body component of the fuel injector and on the other hand on a throttle bore body which surrounds the nozzle needle in regions. The throttle bore body in turn is supported on a shoulder of the nozzle needle. In the throttle bore body at least one throttle bore is formed, which serves as a closing throttle and the
Hochdruckbohrung in einen ersten und einen zweiten Teilbereich trennt. Im ersten Teilbereich, der in Strömungsrichtung des Kraftstoffs stromaufwärts in Bezug auf den zweiten Teilbereich liegt, herrscht ein hydraulischer Druck pi, und im zweiten Teilbereich ein hydraulischer Druck p2, der kleiner als pi ist, da der Kraftstoff, um bei einer Einspritzung vom ersten Teilbereich in den zweiten Teilbereich zu gelangen, die Drosselbohrung passieren muss. Zugleich weist der die Düsennadel bereichsweise umgebende Drosselbohrungskörper eine den ersten Teilbereich begrenzende hydraulisch wirksame Fläche Ai auf, die größer als eine den zweiten Teilbereich begrenzende hydraulisch wirksame Fläche A2 ist. Diese Maßnahmen führen jeweils allein oder in Kombination dazu, dass auf den Drosselbohrungskörper und damit auf die Düsennadel eine zusätzlich zur Federkraft der Schließfeder in Schließrichtung wirkende hydraulische Druckkraft erzeugt wird, welche den Schließvorgang beschleunigt. High-pressure bore in a first and a second portion separates. In the first partial region, which lies upstream in relation to the second partial region in the flow direction of the fuel, there is a hydraulic pressure pi, and in the second partial region a hydraulic pressure p 2 , which is smaller than pi, since the fuel is at an injection from the first Part to reach the second part of the area, the throttle bore must pass. At the same time, the throttle bore body surrounding the nozzle needle in some regions has a hydraulically effective area Ai delimiting the first partial area, which is larger is a hydraulically effective area A 2 delimiting the second subarea. Each of these measures, alone or in combination, produces a hydraulic pressure force acting in the closing direction in addition to the spring force of the closing spring on the throttle body and thus on the nozzle needle, which accelerates the closing process.
Der die Düsennadel umgebende Drosselbohrungskörper der DE 10 2011 076 665 AI wird über die Federkraft der Schließfeder sowie die zusätzlich wirkende hydraulische Druckkraft gegen einen Absatz der Düsennadel gedrückt, so dass im Kontaktbereich eine hohe Dichtwirkung gegeben ist. Im Bereich der Führung des Drosselbohrungskörpers innerhalb der Hochdruckbohrung können jedoch Bypassleckagepfade entstehen, die den Effekt der wenigstens einen The throttle bore body of DE 10 2011 076 665 A1 surrounding the nozzle needle is pressed against a shoulder of the nozzle needle via the spring force of the closing spring and the additionally acting hydraulic pressure force, so that a high sealing effect is provided in the contact region. In the field of guidance of the throttle bore body within the high-pressure bore, however, bypass leakage paths may arise which have the effect of at least one
Drosselbohrung zumindest in Teilen wieder zunichtemachen. Restrict throttle bore at least in parts again.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Düsenbaugruppe mit einer Schließdrossel anzugeben, die wirkungsgradoptimiert ist. Ferner soll die Düsenbaugruppe einfach und kostengünstig herstellbar sein. The present invention has for its object to provide a nozzle assembly with a closing throttle, which is optimized efficiency. Furthermore, the nozzle assembly should be simple and inexpensive to produce.
Die Aufgabe wird gelöst durch eine Düsenbaugruppe mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind den The object is achieved by a nozzle assembly having the features of claim 1. Advantageous developments of the invention are the
Unteransprüchen zu entnehmen. Zur Lösung der Aufgabe wird ferner ein Kraftstoffinjektor mit einer erfindungsgemäßen Düsenbaugruppe vorgeschlagen. Subclaims refer. To solve the problem, a fuel injector with a nozzle assembly according to the invention is also proposed.
Offenbarung der Erfindung Disclosure of the invention
Die für einen Kraftstoffinjektor vorgeschlagene Düsenbaugruppe umfasst eine Düsennadel, die in einer Hochdruckbohrung eines Düsenkörpers zum Freigeben und Verschließen wenigstens einer Einspritzöffnung hubbeweglich The nozzle assembly proposed for a fuel injector includes a nozzle needle which is liftable in a high pressure bore of a nozzle body for releasing and closing at least one injection port
aufgenommen und in Schließrichtung zumindest mittelbar von der Federkraft einer Feder beaufschlagt ist. Zur Ausbildung mindestens einer Schließdrossel ist die Düsennadel bereichsweise von einem Drosselbohrungskörper umgeben, der erfindungsgemäß mehrteilig ausgeführt ist und wenigstens zwei zumindest bereichsweise ineinander geführte Hülsen umfasst. Das Ineinanderführen der Hülsen verlagert den leckagebehafteten Führungsbereich nach radial innen, so dass bereits durch den verringerten Führungsdurchmesser die Leckage reduziert wird. Vorzugsweise verbleibt zwischen den Hülsen des Drosselbohrungskörpers und dem Düsenkörper ein Ringspalt, der eine in radialer Richtung schwimmende Lagerung der Hülsen erlaubt. Die schwimmende Lagerung in radialer Richtung ermöglicht den Ausgleich von Fertigungs- und/oder Montagetoleranzen, insbesondere kann ein Achsversatz der Düsennadellängsachse in Bezug auf einen Dichtsitz ausgeglichen werden. Ferner bewirkt der Ringspalt zwischen den Hülsen und dem Düsenkörper, dass radial außen der Druck p2 und radial innen der Druck pi anliegt. Da p2 kleiner als pi ist, werden die Hülsen in radialer Richtung gegeneinander gedrückt, so dass auf diesem Wege die Leckage im Bereich der Führung weiter reduziert wird. Darüber hinaus kann durch entsprechende Werkstoffwahl und/oder Bearbeitung das Führungsspiel zwischen den beiden Hülsen in einfacher Weise minimiert werden, um die Leckage so gering wie möglich zu halten und den Wirkungsgrad der Schließdrossel zu erhöhen. received and acted upon in the closing direction, at least indirectly by the spring force of a spring. In order to form at least one closing throttle, the nozzle needle is surrounded in regions by a throttle bore body which, according to the invention, is designed in several parts and comprises at least two sleeves which are guided into one another at least in regions. The merging of the sleeves displaces the leak-prone guide area radially inward, so that already reduces the leakage through the reduced guide diameter becomes. Preferably, between the sleeves of the throttle bore body and the nozzle body remains an annular gap, which allows a floating in the radial direction storage of the sleeves. The floating mounting in the radial direction allows the compensation of manufacturing and / or assembly tolerances, in particular, an axial offset of the nozzle needle longitudinal axis can be compensated with respect to a sealing seat. Furthermore, the annular gap between the sleeves and the nozzle body causes the pressure p 2 to be applied radially outward and the pressure pi to be radially inward. Since p 2 is smaller than pi, the sleeves are pressed against each other in the radial direction, so that in this way the leakage in the region of the guide is further reduced. In addition, by appropriate choice of material and / or machining, the guide clearance between the two sleeves can be minimized in a simple manner to keep the leakage as low as possible and to increase the efficiency of the closing throttle.
Bevorzugt ist die Schließdrossel in der Hülse ausgebildet, die näher an der Einspritzöffnung angeordnet ist. Durch diese Maßnahme kann das Preferably, the closing throttle is formed in the sleeve, which is arranged closer to the injection opening. By this measure, the
Hydraulikvolumen des zweiten Teilbereichs der Hochdruckbohrung verringert bzw. der mechanische Kraftübertragungsweg gekürzt werden, was sich günstig auf das Ansprechverhalten der bewegten Bauteile auswirkt und somit ein schnelles Nadelschließen fördert. Weiterhin bevorzugt ist zur Ausbildung der Schließdrossel eine axial oder schräg verlaufende Bohrung in der Hülse vorgesehen. Diese Maßnahme dient der Strömungsoptimierung im Bereich der Schließdrossel. Hydraulic volume of the second portion of the high-pressure bore is reduced or the mechanical power transmission can be shortened, which has a favorable effect on the response of the moving components and thus promotes a fast needle closing. Further preferably, an axially or obliquely extending bore in the sleeve is provided to form the closing throttle. This measure serves to optimize the flow in the area of the closing throttle.
Vorteilhafterweise ist die Hülse, die näher an der Einspritzöffnung angeordnet ist, im Wesentlichen topfförmig ausgebildet. Das heißt, dass sie einen Bodenbereich sowie einen hieran angesetzten hohlzylinderförmigen Abschnitt besitzt. Ferner wird vorgeschlagen, dass die Hülse, die näher an der Einspritzöffnung angeordnet ist, die weitere Hülse zumindest bereichsweise umgibt. Das heißt, dass die topfförmige Hülse die weitere Hülse führt, wobei innenumfangsseitig an der weiteren Hülse der Druck pi und außenumfangsseitig an der topfförmigen Hülse der Druck p2 anliegt. Die Druckdifferenz führt zu einer radialen Aufweitung der geführten Hülse, so dass das Führungsspiel zwischen den beiden Hülsen minimiert wird. ln Weiterbildung der Erfindung wird vorgeschlagen, dass die Hülse, die näher an der Einspritzöffnung angeordnet ist, in axialer Richtung an einem vorzugsweise ringförmigen Absatz der Düsennadel abgestützt ist. Zur Ausbildung eines vorzugsweise ringförmigen Absatzes kann die Düsennadel gestuft ausgeführt und/oder aus mehreren Teilen mit unterschiedlichen Außendurchmessern zusammengesetzt sein. Die Hülse wiederum besitzt vorzugsweise eine an dem Absatz anliegende Stützfläche, die beispielsweise an einem Bodenbereich einer topfförmig ausgeführten Hülse ausgebildet sein kann. Dabei hintergreift die Hülse die Düsennadel. Advantageously, the sleeve, which is arranged closer to the injection opening, formed substantially pot-shaped. That is, it has a bottom portion and a hollow cylindrical portion attached thereto. It is also proposed that the sleeve, which is arranged closer to the injection opening, at least partially surrounds the further sleeve. This means that the cup-shaped sleeve guides the further sleeve, wherein the pressure p 2 rests on the inner peripheral side on the further sleeve and the pressure p 2 on the outer peripheral side against the cup-shaped sleeve. The pressure difference leads to a radial expansion of the guided sleeve, so that the guide clearance between the two sleeves is minimized. In a further development of the invention it is proposed that the sleeve, which is arranged closer to the injection opening, is supported in the axial direction on a preferably annular shoulder of the nozzle needle. To form a preferably annular shoulder, the nozzle needle can be stepped and / or composed of several parts with different outer diameters. The sleeve, in turn, preferably has a support surface resting against the shoulder, which may be formed, for example, on a bottom region of a pot-shaped sleeve. The sleeve engages behind the nozzle needle.
Die Druckdifferenz in den beiden Teilräumen der Hochdruckbohrung bewirkt eine hydraulische Druckkraft in axialer Richtung, mittels welcher die an der The pressure difference in the two subspaces of the high-pressure bore causes a hydraulic pressure force in the axial direction, by means of which at the
Düsennadel abgestützte Hülse gegen den Absatz der Düsennadel gedrückt wird. Durch die in Richtung des Absatzes wirkende Axialkraft wird die Abdichtung imNozzle needle supported sleeve is pressed against the shoulder of the nozzle needle. By acting in the direction of paragraph axial force, the seal in
Kontaktbereich der Hülse mit der Düsennadel optimiert, so dass ein weiterer möglicher Leckagepfad verschlossen wird. Contact area of the sleeve with the nozzle needle optimized so that another possible leakage path is closed.
Um die in Richtung des Absatzes der Düsennadel wirkende hydraulische Druckkraft noch zu erhöhen, kann die dem ersten Teilbereich zugewandte hydraulische Wirkfläche der an der Düsennadel abgestützten Hülse größer als die dem zweiten Teilbereich der Hochdruckbohrung zugewandte hydraulische Wirkfläche ausgebildet werden. Alternativ oder ergänzend wird vorgeschlagen, dass die Hülse in Richtung des vorzugsweise ringförmigen Absatzes der Düsennadel von der Federkraft der Feder beaufschlagt ist, deren Federkraft die Düsennadel in Schließrichtung beaufschlagt. Die Hülse ersetzt somit einen an der Düsennadel ausgebildeten oder mit der Düsennadel verbundenen Federteller. Vorzugsweise ist die Feder an einer ringförmigen Stirnfläche der Hülse abgestützt. In order to increase the hydraulic pressure force acting in the direction of the shoulder of the nozzle needle, the hydraulic active surface of the sleeve supported on the nozzle needle can be made larger than the hydraulic active surface facing the second partial region of the high-pressure bore. Alternatively or additionally, it is proposed that the sleeve is acted upon in the direction of the preferably annular shoulder of the nozzle needle by the spring force of the spring whose spring force acts on the nozzle needle in the closing direction. The sleeve thus replaces a trained on the nozzle needle or connected to the nozzle needle spring plate. Preferably, the spring is supported on an annular end face of the sleeve.
Bevorzugt ist zwischen der Düsennadel und der weiteren Hülse, die weniger nah an der Einspritzöffnung angeordnet ist, ein Ringraum ausgebildet. Der Ringraum ermöglicht eine Kraftstoffströmung in Richtung der wenigstens einen Preferably, an annular space is formed between the nozzle needle and the further sleeve, which is arranged less close to the injection opening. The annulus allows fuel flow in the direction of at least one
Einspritzöffnung. Vorteilhafterweise besitzt die weitere Hülse einen Bundabschnitt zur Injection port. Advantageously, the further sleeve has a collar section for
gehäuseseitigen Abstützung. Der Bundabschnitt erstreckt sich vorzugsweise nach radial außen. Der Bundabschnitt kann auf diese Weise als Federteller zur Abstützung der Feder dienen, deren Federkraft die Düsennadel, vorzugsweise mittelbar über die an der Düsennadel abgestützte andere Hülse, in housing-side support. The collar portion preferably extends radially outward. The collar portion can serve in this way as a spring plate for supporting the spring, the spring force of the nozzle needle, preferably indirectly via the supported on the nozzle needle other sleeve, in
Schließrichtung beaufschlagt. Weiterhin vorzugsweise ist die Hülse radial schwimmend in der Hochdruckbohrung gelagert, um etwaige Fertigungsund/oder Montagetoleranzen auszugleichen. Die schwimmende Lagerung in radialer Richtung lässt sich in einfacher Weise über den Bundabschnitt der Hülse zur gehäuseseitigen Abstützung realisieren. Closing direction acted upon. Further preferably, the sleeve is radially floating in the high-pressure bore mounted to compensate for any manufacturing and / or assembly tolerances. The floating bearing in the radial direction can be realized in a simple manner on the collar portion of the sleeve for housing-side support.
Des Weiteren wird vorgeschlagen, dass die Feder, deren Federkraft die Furthermore, it is proposed that the spring whose spring force the
Düsennadel unmittelbar oder mittelbar in Schließrichtung beaufschlagt, radial außen liegend in Bezug auf wenigstens eine Hülse angeordnet ist. Die Feder wird demzufolge nicht von Kraftstoff durchströmt. Auf diese Weise werden Strömungskräfte auf die bewegten Bauteile verhindert, welche die Funktion dieser Bauteile beeinträchtigen könnten. Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Düsennadel gestuft ausgeführt. Die gestufte Ausführung vereinfacht die Ausbildung eines ringförmigen Absatzes zur Abstützung einer Hülse des mehrteilig ausgeführten Drosselbohrungskörpers. Weiterhin bevorzugt weist die Düsennadel im Bereich eines vom Drosselbohrungskörper umgebenen Abschnitts einen verringerten Außendurchmesser auf. Dadurch ist sichergestellt, dass eine an diesem Absatz abgestützte Hülse über die zusätzlich in Schließrichtung wirkende hydraulische Druckkraft in Strömungsrichtung des Kraftstoffs gegen den Absatz gedrückt wird. Nozzle needle directly or indirectly acted upon in the closing direction, radially outward lying with respect to at least one sleeve is arranged. The spring is therefore not traversed by fuel. In this way, flow forces are prevented on the moving components, which could affect the function of these components. According to a preferred embodiment of the invention, the nozzle needle is stepped. The stepped design simplifies the formation of an annular shoulder for supporting a sleeve of the multi-part throttle body. Furthermore, the nozzle needle preferably has a reduced outer diameter in the region of a section surrounded by the throttle bore body. This ensures that a sleeve supported on this shoulder is pressed against the shoulder via the hydraulic pressure force additionally acting in the closing direction in the flow direction of the fuel.
Ferner kann der mehrteilig ausgeführte Drosselbohrungskörper dergestalt sein, dass die Hülsen einen Hubanschlag ausbildend zusammenwirken. Der Further, the multi-part throttle bore body may be such that the sleeves cooperate to form a stroke stop. Of the
Hubanschlag begrenzt den Hub der Düsennadel, was sich ebenfalls vorteilhaft auf ein schnelles Nadelschließen auswirkt. Als erste Anschlagfläche kann beispielsweise eine Bodenfläche einer topfförmigen ersten Hülse und als zweite Anschlagfläche eine ringförmige Stirnfläche einer in der ersten Hülse geführten zweiten Hülse dienen. Darüber hinaus wird ein Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einer erfindungsgemäßen Stroke limit limits the stroke of the nozzle needle, which also has an advantageous effect on a fast needle closing. As a first stop surface, for example, a bottom surface of a pot-shaped first sleeve and serve as a second stop surface, an annular end face of a guided in the first sleeve second sleeve. In addition, a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with an inventive
Düsenbaugruppe vorgeschlagen. Der mehrteilige Drosselbohrungskörper ist dabei bevorzugt über eine seiner Hülsen an einem Körperbauteil des Nozzle assembly proposed. The multipart throttle bore body is preferably via one of its sleeves on a body part of the
Kraftstoffinjektors, beispielsweise einem Haltekörper oder einer Zwischenplatte, abgestützt. Vorzugsweise ist das Körperbauteil plattenförmig ausgebildet und besitzt eine zentrale Ausnehmung zur Aufnahme der Düsennadel oder eines mit der Düsennadel koppelbaren Druckstifts. Weiterhin vorzugsweise dient die zentrale Ausnehmung im Körperbauteil zugleich als Zulaufkanal. Die  Fuel injector, for example, a holding body or an intermediate plate, supported. Preferably, the body component is plate-shaped and has a central recess for receiving the nozzle needle or a pressure pin which can be coupled to the nozzle needle. Furthermore, preferably, the central recess in the body component at the same time serves as an inlet channel. The
Ausnehmung besitzt demnach bevorzugt einen Innendurchmesser, der größer als der Außendurchmesser der Düsennadel oder des Druckstifts in diesem Bereich ist. Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnung näher erläutert. Diese zeigt einen schematischen Längsschnitt durch eine erfindungsgemäße Düsenbaugruppe.  Accordingly, the recess preferably has an inner diameter that is larger than the outer diameter of the nozzle needle or of the pressure pin in this area. A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. This shows a schematic longitudinal section through a nozzle assembly according to the invention.
Ausführliche Beschreibung der Zeichnung Detailed description of the drawing
Die dargestellte Düsenbaugruppe umfasst eine Düsennadel 1, die in einer Hochdruckbohrung 2 eines Düsenkörpers 3 hubbeweglich aufgenommen ist. Über die Hubbewegung der Düsennadel 1 ist wenigstens eine Einspritzöffnung 4 freigebbar und verschließbar. Bei freigegebener Einspritzöffnung 4 wird unter hohem Druck stehender Kraftstoff in einen Brennraum einer BrennkraftmaschineThe illustrated nozzle assembly comprises a nozzle needle 1, which is received in a liftable manner in a high-pressure bore 2 of a nozzle body 3. About the lifting movement of the nozzle needle 1 is at least one injection port 4 can be opened and closed. When the injection opening 4 is released, high-pressure fuel enters a combustion chamber of an internal combustion engine
(nicht dargestellt) eingespritzt. injected (not shown).
In Schließrichtung ist die Düsennadel 1 von der Federkraft einer Feder 5 beaufschlagt, die hierzu einerseits an einem Bundabschnitt 10 einer ersten Hülse 7.1 und andererseits an einer ringförmigen Stirnfläche 14 einer topfförmigen zweiten Hülse 7 eines mehrteilig ausgeführten In the closing direction, the nozzle needle 1 is acted upon by the spring force of a spring 5, which on the one hand on a collar portion 10 of a first sleeve 7.1 and on the other hand on an annular end face 14 of a cup-shaped second sleeve 7 of a multipart executed
Drosselbohrungskörpers 7 abgestützt ist. In der topfförmigen zweiten Hülse 7.2 ist eine durch einen Bodenbereich 15 der Hülse 7.2 schräg verlaufende Throttle bore body 7 is supported. In the cup-shaped second sleeve 7.2 is a through a bottom portion 15 of the sleeve 7.2 obliquely
Drosselbohrung als Schließdrossel 6 ausgebildet, die Teil des Strömungsweges des einzuspritzenden Kraftstoffs ist. Die Schließdrossel 6 bewirkt, dass der hydraulische Druck pi in einem ersten Teilbereich 2.1 der Hochdruckbohrung 2 größer als der hydraulische Druck p2 in einem zweiten Teilbereich 2.2 der Hochdruckbohrung 2 ist. Die Druckdifferenz wiederum führt zu einer in Throttle bore formed as a closing throttle 6, which is part of the flow path of the fuel to be injected. The closing throttle 6 causes the Hydraulic pressure pi in a first portion 2.1 of the high pressure bore 2 is greater than the hydraulic pressure p 2 in a second portion 2.2 of the high pressure bore 2 is. The pressure difference in turn leads to a
Schließrichtung wirkenden hydraulischen Kraft, welche die topfförmige Hülse 7.2 und mittelbar über die topfförmige Hülse 7.2 die Düsennadel 1 beaufschlagt. Die hydraulische Kraft bewirkt gemeinsam mit der Federkraft der Feder 5 ein schnelles Nadelschließen. Closing direction acting hydraulic force, which acts on the pot-shaped sleeve 7.2 and indirectly via the cup-shaped sleeve 7.2, the nozzle needle 1. The hydraulic force, together with the spring force of the spring 5 causes a quick needle closing.
Die topfförmige Hülse 7.2 ist hierzu an einem ringförmigen Absatz 8 der The pot-shaped sleeve 7.2 is for this purpose on an annular shoulder 8 of
Düsennadel 1 abgestützt und mittels der Federkraft der Feder 5 in Richtung desDüsennadel 1 supported and by means of the spring force of the spring 5 in the direction of
Absatzes 8 axial vorgespannt. Die Federkraft der Feder 5 sowie die in Paragraph 8 axially biased. The spring force of the spring 5 and the in
Schließrichtung wirkende hydraulische Kraft bewirken eine Dichtkraft, die eine Leckage im Kontaktbereich 16 der Hülse 7.2 mit der Düsennadel 1 weitgehend verhindert. Closing direction acting hydraulic force cause a sealing force, which largely prevents leakage in the contact region 16 of the sleeve 7.2 with the nozzle needle 1.
Die topfförmige Hülse 7.2 umgibt die weitere Hülse 7.1 des mehrteiligen The pot-shaped sleeve 7.2 surrounds the further sleeve 7.1 of the multi-part
Drosselbohrungskörpers 7 bereichsweise, so dass diese über die topfförmige Hülse 7.2 geführt wird. Der Führungsbereich 17 stellt einen weiteren in der Regel leckagebehafteten Kontaktbereich dar. Vorliegend wirken jedoch die Drosselbohrungskörpers 7 partially, so that it is guided over the cup-shaped sleeve 7.2. The guide region 17 represents a further contact area that is usually leaking. However, in the present case, the
Druckverhältnisse in den Teilbereichen 2.1, 2.2 der Hochdruckbohrung 2 einerPressure conditions in the sub-areas 2.1, 2.2 of the high-pressure bore 2 a
Leckage entgegen. Denn innenumfangseitig an der von dem einzuspritzenden Kraftstoff durchströmten Hülse 7.1 liegt der Druck pi, außenumfangseitig an der Hülse 7.2 der Druck p2 an. Aufgrund der Druckdifferenz wird die Wandung der Hülse 7.1 gegen die Wandung der Hülse 7.2 gedrückt. In Abhängigkeit vom Druck pi kann die Hülse 7.1 zudem eine radiale Aufweitung erfahren. Damit dieLeakage. For on the inner circumference side of the flowed through by the fuel to be injected sleeve 7.1 is the pressure pi, the outer peripheral side of the sleeve 7.2 of the pressure p 2 at. Due to the pressure difference, the wall of the sleeve 7.1 is pressed against the wall of the sleeve 7.2. Depending on the pressure pi, the sleeve 7.1 can also experience a radial expansion. So that
Hülse 7.1 von dem einzuspritzenden Kraftstoff durchströmt wird, ist zwischen der Hülse 7.1 und der Düsennadel 1 ein Ringraum 9 ausgebildet, der Teil des Strömungsweges des einzuspritzenden Kraftstoffs ist. Eine weitere grundsätzlich leckagebehaftete Dichtstelle stellt der Sleeve 7.1 is flowed through by the fuel to be injected, an annular space 9 is formed between the sleeve 7.1 and the nozzle needle 1, which is part of the flow path of the fuel to be injected. Another leak-tight sealing point is the
Kontaktbereich 18 der Hülse 7.1 an einem plattenförmigen Körperbauteil 11 des Kraftstoffinjektors dar. Da vorliegend jedoch die Feder 5 an dem  Contact area 18 of the sleeve 7.1 to a plate-shaped body member 11 of the fuel injector. However, in the present case, the spring 5 on the
Bundabschnitt 10 der Hülse 7.1 abgestützt ist, drückt die Federkraft der Feder 5 die Hülse 7.1 gegen das Körperbauteil 11. Darüber hinaus liegt an der Stirnfläche der Hülse 7.1, die dem Kontaktbereich 18 abgewandt ist, der Druck pi an, der eine zusätzliche hydraulische Kraft in Richtung des Körperbauteils 11 bewirkt. Die Stirnfläche der Hülse 7.1 bildet vorliegend zugleich einen Hubanschlag 13 aus, wenn beim Nadelöffnen die Hülse 7.2 über ihren Bodenbereich 15 in Kontakt mit der als Hubanschlag 13 dienenden Stirnfläche der Hülse 7.1 gelangt. Bund section 10 of the sleeve 7.1 is supported, the spring force of the spring 5 presses the sleeve 7.1 against the body member 11. In addition, is located on the end face of the sleeve 7.1, which faces away from the contact area 18, the pressure pi, the causes an additional hydraulic force in the direction of the body member 11. The end face of the sleeve 7.1 forms in the present case at the same time a stroke stop 13, when the needle 7.2, the sleeve 7.2 reaches over its bottom portion 15 in contact with serving as a stroke stop 13 face of the sleeve 7.1.
Die Düsennadel 1 der dargestellten Düsenbaugruppe ist gestuft ausgeführt und besitzt einen Abschnitt 12 mit verringertem Außendurchmesser zur Aufnahme des mehrteiligen Drosselbohrungskörpers 7 und zur Ausbildung des ringförmigen Absatzes 8, an dem die topfförmige Hülse 7.2 des Drosselbohrungskörpers 7 abgestützt ist. Der einzuspritzende Kraftstoff strömt an diesem Abschnitt 12 derThe nozzle needle 1 of the illustrated nozzle assembly is stepped and has a portion 12 with reduced outer diameter for receiving the multi-part throttle body 7 and the formation of the annular shoulder 8, on which the cup-shaped sleeve 7.2 of the throttle body 7 is supported. The fuel to be injected flows at this section 12 of the
Düsennadel 1 vorbei in Richtung der Schließdrossel 6 und gelangt über die Schließdrossel 6 in den zweiten Teilbereich 2.2 der Hochdruckbohrung 2. Die Strömungsrichtung des Kraftstoffs ist mittels der Pfeile 19 angegeben. Nozzle needle 1 over in the direction of the closing throttle 6 and passes through the closing throttle 6 in the second portion 2.2 of the high-pressure bore 2. The flow direction of the fuel is indicated by the arrows 19.

Claims

Ansprüche claims
1. Düsenbaugruppe für einen Kraftstoffinjektor mit einer Düsennadel (1), die in einer Hochdruckbohrung (2) eines Düsenkörpers (3) zum Freigeben und Verschließen wenigstens einer Einspritzöffnung (4) hubbeweglich aufgenommen und in Schließrichtung zumindest mittelbar von der Federkraft einer Feder (5) beaufschlagt ist, wobei die Düsennadel (1) zur Ausbildung mindestens einer Schließdrossel (6) bereichsweise von einem Drosselbohrungskörper (7) umgeben ist, 1. nozzle assembly for a fuel injector with a nozzle needle (1) in a high-pressure bore (2) of a nozzle body (3) for releasing and closing at least one injection port (4) received in a liftable manner and in the closing direction at least indirectly by the spring force of a spring (5) is acted upon, wherein the nozzle needle (1) for forming at least one closing throttle (6) is partially surrounded by a throttle bore body (7),
dadurch gekennzeichnet, dass der Drosselbohrungskörper (7) mehrteilig ausgeführt ist und wenigstens zwei zumindest bereichsweise ineinander geführte Hülsen (7.1, 7.2) umfasst. characterized in that the throttle bore body (7) is designed in several parts and at least two at least partially intermeshed sleeves (7.1, 7.2).
2. Düsenbaugruppe nach Anspruch 1, 2. Nozzle assembly according to claim 1,
dadurch gekennzeichnet, dass die Schließdrossel (6) in der Hülse (7.2) ausgebildet ist, die näher an der Einspritzöffnung (4) angeordnet ist, wobei vorzugsweise zur Ausbildung der Schließdrossel (6) eine axial oder schräg verlaufende Bohrung in der Hülse (7.2) vorgesehen ist. characterized in that the closing throttle (6) in the sleeve (7.2) is formed, which is arranged closer to the injection port (4), preferably for forming the closing throttle (6) has an axially or obliquely extending bore in the sleeve (7.2) is provided.
3. Düsenbaugruppe nach Anspruch 1 oder 2, 3. Nozzle assembly according to claim 1 or 2,
dadurch gekennzeichnet, dass die Hülse (7.2), die näher an der characterized in that the sleeve (7.2) closer to the
Einspritzöffnung (4) angeordnet ist, im Wesentlichen topfförmig ausgebildet ist und die weitere Hülse (7.1) zumindest bereichsweise umgibt. Injection opening (4) is arranged, is substantially cup-shaped and surrounds the further sleeve (7.1) at least partially.
4. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, 4. Nozzle assembly according to one of the preceding claims,
dadurch gekennzeichnet, dass die Hülse (7.2), die näher an der characterized in that the sleeve (7.2) closer to the
Einspritzöffnung (4) angeordnet ist, in axialer Richtung an einem vorzugsweise ringförmigen Absatz (8) der Düsennadel (1) abgestützt ist. Injection opening (4) is arranged, in the axial direction on a preferably annular shoulder (8) of the nozzle needle (1) is supported.
5. Düsenbaugruppe nach Anspruch 4, 5. nozzle assembly according to claim 4,
dadurch gekennzeichnet, dass die Hülse (7.2) in Richtung des vorzugsweise ringförmigen Absatzes (8) der Düsennadel (1) von der Federkraft der Feder (5) beaufschlagt ist, wobei vorzugsweise die Feder (5) an einer ringförmigen Stirnfläche (14) der Hülse (7.2) abgestützt ist. characterized in that the sleeve (7.2) in the direction of the preferably annular shoulder (8) of the nozzle needle (1) is acted upon by the spring force of the spring (5), wherein preferably the spring (5) on an annular end face (14) of the sleeve (7.2) is supported.
6. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der Düsennadel (1) und der weiteren Hülse (7.1), die weniger nah an der Einspritzöffnung (4) angeordnet ist, ein Ringraum (9) ausgebildet ist. 6. Nozzle assembly according to one of the preceding claims, characterized in that between the nozzle needle (1) and the further sleeve (7.1), which is arranged less close to the injection port (4), an annular space (9) is formed.
7. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die weitere Hülse (7.1) einen sich vorzugsweise nach radial außen erstreckenden Bundabschnitt (10) zur gehäuseseitigen Abstützung besitzt, wobei vorzugsweise die weitere Hülse (7.1) radial schwimmend in der Hochdruckbohrung (4) gelagert ist. 7. Nozzle assembly according to one of the preceding claims, characterized in that the further sleeve (7.1) has a preferably radially outwardly extending collar portion (10) for housing-side support, wherein preferably the further sleeve (7.1) radially floating in the high-pressure bore (4 ) is stored.
8. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Feder (5) radial außen liegend in Bezug auf wenigstens eine Hülse (7.1) angeordnet ist. 8. Nozzle assembly according to one of the preceding claims, characterized in that the spring (5) is arranged radially outwardly in relation to at least one sleeve (7.1).
9. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Düsennadel (1), insbesondere zur 9. Nozzle assembly according to one of the preceding claims, characterized in that the nozzle needle (1), in particular for
Ausbildung eines ringförmigen Absatzes (8), gestuft ausgeführt ist, wobei vorzugsweise ein vom Drosselbohrungskörper (7) umgebener Abschnitt (12) der Düsennadel (1) mit verringertem Außendurchmesser ausgeführt ist. Forming of an annular shoulder (8) is executed stepped, wherein preferably from the throttle body (7) surrounded portion (12) of the nozzle needle (1) is designed with a reduced outer diameter.
10. Düsenbaugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Hülsen (7.1, 7.2) des mehrteilig 10. Nozzle assembly according to one of the preceding claims, characterized in that the sleeves (7.1, 7.2) of the multipart
ausgeführten Drosselbohrungskörpers (7) einen Hubanschlag (13) ausbildend zusammenwirken. running throttle body (7) a stroke stop (13) forming cooperate.
11. Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einer Düsenbaugruppe nach einem der vorhergehenden Ansprüche, wobei der Drosselbohrungskörper (7) über eine der Hülsen (7.1, 7.2) an einem vorzugsweise plattenförmigen Körperbauteil (11) des Kraftstoffinjektors abgestützt ist. 11. Fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with a nozzle assembly according to one of the preceding claims, wherein the throttle bore body (7) via one of the sleeves (7.1, 7.2) is supported on a preferably plate-shaped body member (11) of the fuel injector.
EP15714533.5A 2014-05-26 2015-04-13 Nozzle assembly for a fuel injector, and fuel injector Not-in-force EP3149321B1 (en)

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DE102014209961.7A DE102014209961A1 (en) 2014-05-26 2014-05-26 Nozzle assembly for a fuel injector and fuel injector
PCT/EP2015/057961 WO2015180883A1 (en) 2014-05-26 2015-04-13 Nozzle assembly for a fuel injector, and fuel injector

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US20170184065A1 (en) 2017-06-29
WO2015180883A1 (en) 2015-12-03
KR102274062B1 (en) 2021-07-08
EP3149321B1 (en) 2019-01-16
KR20170012365A (en) 2017-02-02
US10018169B2 (en) 2018-07-10
CN106414992A (en) 2017-02-15
DE102014209961A1 (en) 2015-11-26

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