EP3149321B1 - Nozzle assembly for a fuel injector, and fuel injector - Google Patents

Nozzle assembly for a fuel injector, and fuel injector Download PDF

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Publication number
EP3149321B1
EP3149321B1 EP15714533.5A EP15714533A EP3149321B1 EP 3149321 B1 EP3149321 B1 EP 3149321B1 EP 15714533 A EP15714533 A EP 15714533A EP 3149321 B1 EP3149321 B1 EP 3149321B1
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EP
European Patent Office
Prior art keywords
sleeve
pot
nozzle
nozzle assembly
nozzle needle
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.)
Not-in-force
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EP15714533.5A
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German (de)
French (fr)
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EP3149321A1 (en
Inventor
Andreas Koeninger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3149321A1 publication Critical patent/EP3149321A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—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
    • F02M61/16—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
    • F02M61/04—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 injecting fuel into the combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.
  • a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine which comprises for releasing and closing at least one injection opening a liftable in a high-pressure bore of a nozzle body nozzle needle received.
  • the 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 separates into a first and a second portion.
  • a hydraulic pressure p 1 prevails, and in the second partial region a hydraulic pressure p 2 , which is smaller than p 1 , since the fuel is at one injection to get from the first part to the second part, the throttle bore must pass.
  • the throttle bore body surrounding the nozzle needle in certain regions has a hydraulically effective area A 1 delimiting the first partial area, which is larger is a hydraulically effective area A 2 delimiting the second subarea.
  • the throttle needle surrounding the nozzle bore of the DE 10 2011 076 665 A1 is pressed over the spring force of the closing spring and the additional acting hydraulic pressure force against a shoulder of the nozzle needle, so that in the contact area is given a high sealing effect.
  • bypass leakage paths may occur which at least partially negate the effect of the at least one throttle bore.
  • the WO2008 / 015039 A1 discloses a nozzle assembly according to the preamble of claim 1.
  • 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.
  • a nozzle assembly having the features of claim 1.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a fuel injector with a nozzle assembly according to the invention is also proposed.
  • the nozzle assembly proposed for a fuel injector comprises a nozzle needle, which is received in a liftable manner in a high-pressure bore of a nozzle body for releasing and closing at least one injection opening and acted upon in the closing direction at least indirectly by the spring force of a spring.
  • 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.
  • the annular gap between the sleeves and the nozzle body causes the pressure p 2 to be applied radially on the outside and the pressure p 1 radially inward. Since p 2 is smaller than p 1 , 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.
  • the hydraulic volume of the second portion of the high-pressure bore can be 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 axially closer to the injection opening in the closing direction, is cup-shaped. That is, it has a bottom portion and a hollow cylindrical portion attached thereto. Furthermore, it surrounds the further sleeve at least partially. That is, the cup-shaped sleeve guides the further sleeve, wherein the inner peripheral side of the further sleeve of the pressure p 1 and the outer peripheral side of the cup-shaped sleeve, the pressure p 2 is applied.
  • the pressure difference leads to a radial expansion of the guided sleeve, so that the guide clearance between the two sleeves is minimized.
  • the cup-shaped sleeve is supported in the axial direction on an 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 the sleeve supported on the nozzle needle is pressed against the shoulder of the nozzle needle.
  • axial force By acting in the direction of paragraph axial force the seal in the contact area of the sleeve is optimized with the nozzle needle, so that a further possible leakage path is closed.
  • 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 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 toward the at least one injection port.
  • the further sleeve has a collar portion for 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 whose spring force acts on the nozzle needle, preferably indirectly via the supported on the nozzle needle other sleeve in the closing direction.
  • the sleeve is radially floating in the high pressure bore stored 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 spring whose spring force acts on the nozzle needle directly or indirectly in the closing direction, is arranged radially outward in relation to at least one sleeve.
  • 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.
  • 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.
  • the stroke stop 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.
  • a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with a nozzle assembly is proposed.
  • the multi-part throttle bore body is preferably supported via one of its sleeves on a body component of the fuel injector, for example a holding body or an intermediate plate.
  • 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 therefore preferably has an inner diameter that is larger than the outer diameter of the nozzle needle or 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 is injected into a combustion chamber of an internal combustion engine (not shown).
  • the nozzle needle 1 In the closing direction, the nozzle needle 1 is acted upon by the spring force of a spring 5, which is supported for this purpose 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 multi-part throttle bore body 7.
  • a closing throttle 6 In the pot-shaped second sleeve 7.2 a through a bottom portion 15 of the sleeve 7.2 obliquely extending throttle bore is 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 p 1 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.
  • the pressure difference in turn leads to a force acting in the closing direction 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 supported on an annular shoulder 8 of the nozzle needle 1 and axially biased by the spring force of the spring 5 in the direction of paragraph 8.
  • the spring force of the spring 5 and the force acting in the closing direction 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 cup-shaped sleeve 7.2 surrounds the further sleeve 7.1 of the multi-part throttle bore body 7 regionally, so that it is guided over the cup-shaped sleeve 7.2.
  • the guide region 17 represents another contact region, which is generally subject to leakage.
  • the pressure conditions in the subregions 2.1, 2.2 of the high-pressure bore 2 counteract leakage.
  • the pressure p 1 For the inside circumference of the sleeve 7.1 through which the fuel to be injected flows, the pressure p 1 , the outside circumference of the sleeve 7.2, the pressure p 2 . Due to the pressure difference, the wall of the sleeve 7.1 is pressed against the wall of the sleeve 7.2.
  • the sleeve 7.1 can also experience a radial expansion. So that 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 contact point 18 of the sleeve 7.1 on a plate-shaped body component 11 of the fuel injector represents a further leakage-prone sealing point.
  • the spring 5 is supported on the collar portion 10 of the sleeve 7.1, the spring force of the spring 5 presses the sleeve 7.1 against the body component 11
  • the pressure p 1 is at the end face of the sleeve 7.1, which faces away from the contact region 18, 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.
  • 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 past this portion 12 of the nozzle needle 1 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft eine Düsenbaugruppe für einen Kraftstoffinjektor zum 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.The invention relates to a nozzle assembly for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.

Stand der TechnikState of the art

Aus der Offenlegungsschrift DE 10 2011 076 665 A1 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 Düsenkörpers hubbeweglich aufgenommene Düsennadel umfasst. Die 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 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 p1, und im zweiten Teilbereich ein hydraulischer Druck p2, der kleiner als p1 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 A1 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.From the publication DE 10 2011 076 665 A1 a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine is known, which comprises for releasing and closing at least one injection opening a liftable in a high-pressure bore of a nozzle body nozzle needle received. The 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 separates into a first and a second portion. In the first partial region, which lies upstream in relation to the second partial region in the flow direction of the fuel, a hydraulic pressure p 1 prevails, and in the second partial region a hydraulic pressure p 2 , which is smaller than p 1 , since the fuel is at one injection to get from the first part to the second part, the throttle bore must pass. At the same time, the throttle bore body surrounding the nozzle needle in certain regions has a hydraulically effective area A 1 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 A1 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 Drosselbohrung zumindest in Teilen wieder zunichtemachen.The throttle needle surrounding the nozzle bore of the DE 10 2011 076 665 A1 is pressed over the spring force of the closing spring and the additional acting hydraulic pressure force against a shoulder of the nozzle needle, so that in the contact area is given a high sealing effect. However, in the region of the guidance of the throttle bore body within the high-pressure bore, bypass leakage paths may occur which at least partially negate the effect of the at least one throttle bore.

Die WO2008/015039 A1 offenbart eine Düsenbaugruppe gemäß dem Oberbegriff des Anspruchs 1.The WO2008 / 015039 A1 discloses a nozzle assembly according to the preamble of claim 1.

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 Unteransprüchen zu entnehmen. Zur Lösung der Aufgabe wird ferner ein Kraftstoffinjektor mit einer erfindungsgemäßen Düsenbaugruppe vorgeschlagen.The object is achieved by a nozzle assembly having the features of claim 1. Advantageous developments of the invention can be found in the dependent claims. To solve the problem, a fuel injector with a nozzle assembly according to the invention is also proposed.

Offenbarung der ErfindungDisclosure 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 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 p1 anliegt. Da p2 kleiner als p1 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.The nozzle assembly proposed for a fuel injector comprises a nozzle needle, which is received in a liftable manner in a high-pressure bore of a nozzle body for releasing and closing at least one injection opening 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 on the outside and the pressure p 1 radially inward. Since p 2 is smaller than p 1 , 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 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.Preferably, the closing throttle is formed in the sleeve, which is arranged closer to the injection opening. By this measure, the hydraulic volume of the second portion of the high-pressure bore can be 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.

Die Hülse, die axial in Schließrichtung näher an der Einspritzöffnung angeordnet ist, ist topfförmig ausgebildet. Das heißt, dass sie einen Bodenbereich sowie einen hieran angesetzten hohlzylinderförmigen Abschnitt besitzt. Ferner umgibt sie die weitere Hülse zumindest bereichsweise. Das heißt, dass die topfförmige Hülse die weitere Hülse führt, wobei innenumfangsseitig an der weiteren Hülse der Druck p1 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.The sleeve, which is arranged axially closer to the injection opening in the closing direction, is cup-shaped. That is, it has a bottom portion and a hollow cylindrical portion attached thereto. Furthermore, it surrounds the further sleeve at least partially. That is, the cup-shaped sleeve guides the further sleeve, wherein the inner peripheral side of the further sleeve of the pressure p 1 and the outer peripheral side of the cup-shaped sleeve, the pressure p 2 is applied. The pressure difference leads to a radial expansion of the guided sleeve, so that the guide clearance between the two sleeves is minimized.

Die topfförmige Hülse ist in axialer Richtung an einem ringförmigen Absatz der Düsennadel abgestützt. Zur Ausbildung des 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.The cup-shaped sleeve is supported in the axial direction on an annular shoulder of the nozzle needle. To form the 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 Düsennadel abgestützte Hülse gegen den Absatz der Düsennadel gedrückt wird. Durch die in Richtung des Absatzes wirkende Axialkraft wird die Abdichtung im Kontaktbereich der Hülse mit der Düsennadel optimiert, so dass ein weiterer möglicher Leckagepfad verschlossen wird.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 the sleeve supported on the nozzle needle is pressed against the shoulder of the nozzle needle. By acting in the direction of paragraph axial force the seal in the contact area of the sleeve is optimized with the nozzle needle, so that a further 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.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.

Alternativ oder ergänzend wird vorgeschlagen, dass die Hülse in Richtung des 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.Alternatively or additionally, it is proposed that the sleeve is acted upon in the direction of the 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 Einspritzöffnung.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 toward the at least one injection port.

Vorteilhafterweise besitzt die weitere Hülse einen Bundabschnitt zur 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 Schließrichtung beaufschlagt. Weiterhin vorzugsweise ist die Hülse radial schwimmend in der Hochdruckbohrung gelagert, um etwaige Fertigungs- und/oder Montagetoleranzen auszugleichen. Die schwimmende Lagerung in radialer Richtung lässt sich in einfacher Weise über den Bundabschnitt der Hülse zur gehäuseseitigen Abstützung realisieren.Advantageously, the further sleeve has a collar portion for 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 whose spring force acts on the nozzle needle, preferably indirectly via the supported on the nozzle needle other sleeve in the closing direction. Further preferably, the sleeve is radially floating in the high pressure bore stored 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 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.Furthermore, it is proposed that the spring, whose spring force acts on the nozzle needle directly or indirectly in the closing direction, is arranged radially outward in relation to at least one sleeve. 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.

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.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 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.Further, the multi-part throttle bore body may be such that the sleeves cooperate to form a stroke stop. The stroke stop 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.

Darüber hinaus wird ein Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einer erfindungsgemäßen Düsenbaugruppe vorgeschlagen. Der mehrteilige Drosselbohrungskörper ist dabei bevorzugt über eine seiner Hülsen an einem Körperbauteil des 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 Ausnehmung besitzt demnach bevorzugt einen Innendurchmesser, der größer als der Außendurchmesser der Düsennadel oder des Druckstifts in diesem Bereich ist.In addition, a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with a nozzle assembly according to the invention is proposed. The multi-part throttle bore body is preferably supported via one of its sleeves on a body component of the fuel injector, for example a holding body or an intermediate plate. 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 recess therefore preferably has an inner diameter that is larger than the outer diameter of the nozzle needle or the pressure pin in this area.

Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnung näher erläutert. Diese zeigt einen schematischen Längsschnitt durch eine erfindungsgemäße Düsenbaugruppe.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 ZeichnungDetailed 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 Brennkraftmaschine (nicht dargestellt) eingespritzt.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. 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 is injected into a combustion chamber of an internal combustion engine (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 Drosselbohrungskörpers 7 abgestützt ist. In der topfförmigen zweiten Hülse 7.2 ist eine durch einen Bodenbereich 15 der Hülse 7.2 schräg verlaufende Drosselbohrung als Schließdrossel 6 ausgebildet, die Teil des Strömungsweges des einzuspritzenden Kraftstoffs ist. Die Schließdrossel 6 bewirkt, dass der hydraulische Druck p1 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 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.In the closing direction, the nozzle needle 1 is acted upon by the spring force of a spring 5, which is supported for this purpose 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 multi-part throttle bore body 7. In the pot-shaped second sleeve 7.2 a through a bottom portion 15 of the sleeve 7.2 obliquely extending throttle bore is 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 p 1 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. The pressure difference in turn leads to a force acting in the closing direction 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 Düsennadel 1 abgestützt und mittels der Federkraft der Feder 5 in Richtung des Absatzes 8 axial vorgespannt. Die Federkraft der Feder 5 sowie die in Schließrichtung wirkende hydraulische Kraft bewirken eine Dichtkraft, die eine Leckage im Kontaktbereich 16 der Hülse 7.2 mit der Düsennadel 1 weitgehend verhindert.The pot-shaped sleeve 7.2 is for this purpose supported on an annular shoulder 8 of the nozzle needle 1 and axially biased by the spring force of the spring 5 in the direction of paragraph 8. The spring force of the spring 5 and the force acting in the closing direction 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 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 Druckverhältnisse in den Teilbereichen 2.1, 2.2 der Hochdruckbohrung 2 einer Leckage entgegen. Denn innenumfangseitig an der von dem einzuspritzenden Kraftstoff durchströmten Hülse 7.1 liegt der Druck p1, 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 p1 kann die Hülse 7.1 zudem eine radiale Aufweitung erfahren. Damit die 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.The cup-shaped sleeve 7.2 surrounds the further sleeve 7.1 of the multi-part throttle bore body 7 regionally, so that it is guided over the cup-shaped sleeve 7.2. The guide region 17 represents another contact region, which is generally subject to leakage. However, in the present case, the pressure conditions in the subregions 2.1, 2.2 of the high-pressure bore 2 counteract leakage. For the inside circumference of the sleeve 7.1 through which the fuel to be injected flows, the pressure p 1 , the outside circumference of the sleeve 7.2, the pressure p 2 . 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 p 1 , the sleeve 7.1 can also experience a radial expansion. So that 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.

Eine weitere grundsätzlich leckagebehaftete Dichtstelle stellt der Kontaktbereich 18 der Hülse 7.1 an einem plattenförmigen Körperbauteil 11 des Kraftstoffinjektors dar. Da vorliegend jedoch die Feder 5 an dem 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 p1 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.Another contact point 18 of the sleeve 7.1 on a plate-shaped body component 11 of the fuel injector represents a further leakage-prone sealing point. However, since the spring 5 is supported on the collar portion 10 of the sleeve 7.1, the spring force of the spring 5 presses the sleeve 7.1 against the body component 11 In addition, the pressure p 1 is at the end face of the sleeve 7.1, which faces away from the contact region 18, 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 der 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.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 past this portion 12 of the nozzle needle 1 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 (9)

  1. Nozzle assembly for a fuel injector having a nozzle needle (1) which is received in a high pressure bore (2) of a nozzle body (3) such that it can perform stroke movements in order to open and close at least one injection opening (4) and is loaded in the closing direction at least indirectly by the spring force of a spring (5), the nozzle needle (1) being surrounded in regions by a throttle bore body (7) in order to configure at least one closing throttle (6), characterized in that the throttle bore body (7) is configured in multiple pieces and comprises a pot-shaped sleeve (7.2) arranged closer to the injection opening (4) axially in the closing direction and a further sleeve (7.1), which are guided into one another at least in regions, the pot-shaped sleeve (7.2) surrounding the further sleeve (7.1) at least in regions, and the pot-shaped sleeve (7.2) being supported axially in the closing direction on an annular shoulder (8) of the nozzle needle (1).
  2. Nozzle assembly according to Claim 1, characterized in that the closing throttle (6) is configured in the pot-shaped sleeve (7.2), an axially or obliquely running bore being provided in the pot-shaped sleeve (7.2) for configuring the closing throttle (6).
  3. Nozzle assembly according to Claim 1, characterized in that the pot-shaped sleeve (7.2) is loaded by the spring force of the spring (5) in the direction of the annular shoulder (8) of the nozzle needle (1), the spring (5) being supported on a preferably annular end face (14) of the pot-shaped sleeve (7.2).
  4. Nozzle assembly according to one of the preceding claims, characterized in that an annular space (9) is configured between the nozzle needle (1) and the further sleeve (7.1).
  5. Nozzle assembly according to one of the preceding claims, characterized in that the further sleeve (7.1) has a radially outwardly extending collar section (10) for housing-side support, the further sleeve (7.1) being mounted in the high pressure bore (4) in a radially floating manner.
  6. Nozzle assembly according to one of the preceding claims, characterized in that the spring (5) is arranged so as to lie radially on the outside in relation to the pot-shaped sleeve (7.2) or the further sleeve (7.1).
  7. Nozzle assembly according to one of the preceding claims, characterized in that the nozzle needle (1) is of stepped configuration, in order to configure the annular shoulder (8), a section (12) of the nozzle needle (1) which is surrounded by the throttle bore body (7) being configured with a reduced external diameter.
  8. Nozzle assembly according to one of the preceding claims, characterized in that the pot-shaped sleeve (7.2) and the further sleeve (7.1) of the throttle bore body (7) which is configured in multiple pieces interact so as to form a stroke stop (13).
  9. Fuel injector for injecting fuel into the combustion chamber of an internal combustion engine having a nozzle assembly according to one of the preceding claims, the throttle bore body (7) being supported via the further sleeve (7.1) on a preferably plate-shaped body component (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)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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

Publications (2)

Publication Number Publication Date
EP3149321A1 EP3149321A1 (en) 2017-04-05
EP3149321B1 true EP3149321B1 (en) 2019-01-16

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US (1) US10018169B2 (en)
EP (1) EP3149321B1 (en)
KR (1) KR102274062B1 (en)
CN (1) CN106414992B (en)
DE (1) DE102014209961A1 (en)
WO (1) WO2015180883A1 (en)

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DE102016210228A1 (en) 2016-06-09 2017-12-14 Robert Bosch Gmbh injection
CN106671341A (en) * 2017-03-03 2017-05-17 湖南精正设备制造有限公司 Hydraulic spring balance automatic spray nozzle
DE102018217761A1 (en) * 2018-10-17 2020-04-23 Robert Bosch Gmbh Fuel injector
US11585452B2 (en) 2019-12-03 2023-02-21 Woodward, Inc. Fuel nozzle with reduced flow tolerance
DE102020215276A1 (en) * 2020-12-03 2022-06-23 Mahle International Gmbh Valve body for an expansion valve

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DE19936668A1 (en) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common rail injector
EP1118765A3 (en) * 2000-01-19 2003-11-19 CRT Common Rail Technologies AG Fuel injector for internal combustion engines
DE10338228A1 (en) * 2003-08-20 2005-03-10 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE102004005456A1 (en) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Fuel injector with direct-acting injection valve member
DE102005015997A1 (en) * 2004-12-23 2006-07-13 Robert Bosch Gmbh Fuel injector with direct control of the injection valve member
DE102006036447A1 (en) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injector for a fuel injection system
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US20170184065A1 (en) 2017-06-29
CN106414992B (en) 2019-11-22
CN106414992A (en) 2017-02-15
US10018169B2 (en) 2018-07-10
EP3149321A1 (en) 2017-04-05
WO2015180883A1 (en) 2015-12-03
DE102014209961A1 (en) 2015-11-26
KR20170012365A (en) 2017-02-02
KR102274062B1 (en) 2021-07-08

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