EP1770275A1 - Hole-type nozzle with a storage volume for a fuel injection apparatus - Google Patents

Hole-type nozzle with a storage volume for a fuel injection apparatus Download PDF

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Publication number
EP1770275A1
EP1770275A1 EP06120340A EP06120340A EP1770275A1 EP 1770275 A1 EP1770275 A1 EP 1770275A1 EP 06120340 A EP06120340 A EP 06120340A EP 06120340 A EP06120340 A EP 06120340A EP 1770275 A1 EP1770275 A1 EP 1770275A1
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EP
European Patent Office
Prior art keywords
nozzle
nozzle body
fuel injection
punch
fuel
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
EP06120340A
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German (de)
French (fr)
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EP1770275B1 (en
Inventor
Giovanni Ferraro
Dietmar Uhlmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1770275A1 publication Critical patent/EP1770275A1/en
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Publication of EP1770275B1 publication Critical patent/EP1770275B1/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
    • F02M61/04—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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention relates to a hole nozzle for a fuel injection device of a fuel injection system, in particular for use in a common rail system, with a nozzle body having a nozzle needle chamber.
  • Such a perforated nozzle is known for example from the book "Diesel Engine Management” Robert Bosch GmbH.
  • a fuel storage such as a "rail” fuel is brought to very high pressures.
  • Earlier common-rail systems have been designed for a maximum pressure of approx. 1350 bar.
  • Current common-rail systems operate at a maximum pressure of 1600 bar. For future applications, much higher pressures are desired.
  • the nozzle needle arranged in the hole nozzle acts as a valve during opening and closing, ie when lifted from an associated nozzle needle seat and when closing it. Due to the high pressures mentioned, starting from the valve needle acting as a valve body Pressure waves are generated, which may exceed the above maximum pressures. As a result, the fuel-carrying components of the common rail system are exposed to high load peaks.
  • pressure waves in the fuel can be damped. Since the pressure waves generated by the opening and closing of the nozzle needle and thus propagate from the nozzle needle chamber, it is particularly advantageous that the attenuation of the pressure waves can take place spatially close to this area.
  • the nozzle needle space and the storage space form independent hydraulic elements.
  • the perforated nozzle according to the invention is based on the idea that it is possible in a region of a fuel injection system to be able to use a material section oversized even when a maximum pressure is applied in order to relieve other regions of the fuel injection system that are spatially remote from this material section.
  • a total fuel injection system can be created, which is particularly robust against high maximum loads, which are particularly caused by pressure waves.
  • the invention further relates to a fuel injection device of a fuel injection system with a hole nozzle.
  • a fuel injection system of an internal combustion engine as a whole carries the reference numeral 10. It comprises a fuel tank 12, from which a delivery system 14 delivers the fuel to a fuel rail 16 ("rail").
  • the conveyor system 14 may include a prefeed pump and a high pressure pump.
  • the fuel injection device 18 has a high-pressure port 20.
  • the fuel injection device 18 is assigned to a combustion chamber 22 of an internal combustion engine, not shown, into which it directly injects the fuel using a hole nozzle 24 described in more detail below.
  • a return line 26 leads back to the fuel tank 12.
  • the return line 26 is connected to the fuel injection device 18 via a low pressure port 28.
  • the fuel injector 18 and the orifice nozzle 24 mounted thereon are shown in more detail in FIG.
  • the marked in Figure 2 section III is shown in Figure 3 enlarged.
  • the hole nozzle 24 has a elongated nozzle body 30, which has at its fuel injector 18 end facing a radially outwardly extended portion 32.
  • a centrally arranged nozzle needle chamber 34 is provided, in which a nozzle needle 36 is arranged.
  • the nozzle needle 36 opens and closes a nozzle needle seat 38 provided at the end of the nozzle needle space 34.
  • the radially widened region 32 has, on its side facing away from the fuel injection device 18, an annular nozzle body shoulder 40, which cooperates with a corresponding annular shoulder 42 of a nozzle retaining nut 44.
  • the nozzle retaining nut 44 is secured to the fuel injector 18 via a thread, not further shown in FIG. With the help of paragraph 42, the nozzle body shoulder 40 and thus the radially expanded portion 32 is pressed against a in Fig. 3 above the hole nozzle 24 shown intermediate member 46.
  • the intermediate element 46 (throttle plate) is adjoined by a valve plate 48, which has a valve designated overall by 50.
  • the valve 50 can be moved by means of a known and therefore not further shown actuator in 52 directions of actuation directions to open the valve 50 or close.
  • the valve 50 is hydraulically connected via a flow restrictor (not shown in FIG. 3) to a control chamber 54.
  • the control chamber 54 is essentially limited by the upper end of the nozzle needle 36 and the intermediate element 46 in FIG. 3.
  • An inlet throttle 56 which is supplied with fuel by means of a fuel inlet 58, opens into the control chamber 54.
  • the fuel inlet 58 is also hydraulically with the Düsennadelraum 34 connected. Between the valve 50 and the nozzle needle chamber 34, a further line 60 is provided.
  • the valve 50 In order to lift the nozzle needle 36 out of its nozzle needle seat 38, so that injection into the combustion chamber 22 shown in FIG. 1 can take place, the valve 50 is opened, so that fuel can flow out of the control chamber 54 via the outlet throttle (not shown). At the same time, fuel flows through the inlet throttle 56 into the control chamber 54. If the throttling effect of the outlet throttle (not shown) is smaller than the throttle effect of the inlet throttle 56, the pressure in the control chamber 54 can be reduced. From a certain pressure drop, the nozzle needle 36 can be lifted out of the nozzle needle seat 38 against the action of a spring element 62 with the aid of the higher pressure applied in the nozzle needle chamber 34, so that injection takes place into the combustion chamber 22.
  • control chamber 54 is sealed relative to the nozzle needle chamber 34 radially outward by means of a sleeve member 64 (control chamber sleeve), which bears sealingly against the intermediate element 46.
  • a sleeve member 64 (control chamber sleeve), which bears sealingly against the intermediate element 46.
  • this sleeve member 64 is formed in Figure 3 as a helical spring spring member 62 from.
  • the spring element 62 could also be formed as a cylindrical sleeve, as shown in the DE 102 13 382 A1 is described. This possibility also exists for the hole nozzle according to the invention described below.
  • FIGS. 4a and 5a show the nozzle body 30 of a hole nozzle 24 according to the invention.
  • This nozzle body 30 has a comparatively slender nozzle body shaft 66, to which a radially outwardly stepped portion 68 connects, to which in turn the radially outwardly extended region 32 connects.
  • the wall of the radially outwardly widened region 32 delimits a substantially cylindrical space 70. This space 70 is limited to the nozzle body shaft 66 by an annular bottom 72.
  • the radially widened region 32 has two part-cylindrical depressions 74 extending essentially in the longitudinal direction of the nozzle body 30.
  • the depressions 74 are offset from one another by a distance deviating from 180 ° in order to receive correspondingly arranged pins which are arranged in the intermediate element 46 according to FIG. In this way, the hole nozzle 24 can be mounted in a certain rotational position on the fuel injection device 18.
  • annular, outer contact surface 76 is formed. This seals the space 70 against the intermediate element 46.
  • FIGS. 4b and 5b show a sleeve element 78 which essentially has a hollow-cylindrical section 80, against which a collar 82 which widens radially outward is fired.
  • the collar forms an annular, inner contact surface 84, which can seal the sleeve member 78 against the intermediate member 46.
  • recesses 86 are provided, which are complementary to the recesses 74 forming material portions of the radially enlarged portion 32 of the nozzle body 30 are formed.
  • FIG. 6 a shows a partially mounted hole nozzle 24, wherein the sleeve element 78 according to FIGS. 4 b and 5 b is mounted in the nozzle body 30 according to FIGS. 4 b and 5 b.
  • the radially outwardly widened region 32 of the nozzle body 30 has a radially inwardly facing cylindrical wall 88.
  • the cylindrical portion 80 of the sleeve member 78 has a radially outwardly facing wall 90.
  • the collar 82 of the sleeve member 78 has a wall 92 facing the annular bottom 72 of the nozzle body 30.
  • the walls 88, 90, 92 and the annular bottom 72 define a generally annular formed storage space 94 which is arranged concentrically to the nozzle needle space 34.
  • the nozzle needle space 34 is bounded along its course by the nozzle body 66 and the stepped portion 68 of the nozzle body 30 and by the cylindrical portion 80 of the sleeve member 78.
  • a first, essentially cylindrical sealing region 96 is formed between the collar 22 and the radially widened region 32. Further, between the cylindrical portion 80 and the nozzle body 30, another, designated 98 sealing region is formed. The sealing region 98 is formed by abutment of an annular rim 100 (see FIG. 5b) of the sleeve element 78 with an inner section 102 of the annular bottom 72 (see FIG. 5a).
  • the storage space 94 is sealed in the direction of the intermediate element 46 according to FIG.
  • throttle elements 104 are formed by 78 provided in the cylindrical portion 80 of the sleeve member small material recesses are.
  • the storage space 94 has the following function: If the nozzle needle 36 is moved out of its nozzle needle seat 38 in the nozzle needle chamber 34 of a perforated nozzle 24 according to the invention, high-pressure fuel can be injected from the nozzle needle chamber 34 into the combustion chamber 22 (see FIG. 1). When the nozzle needle 36 now moves back into the closed position, so that the nozzle needle seat 38 is closed, creates a pressure wave, which is transmitted through the applied fuel in the nozzle needle chamber 34. This pressure wave can be damped to a considerable extent by the fact that fuel flows from the nozzle needle chamber 34 via the throttle elements 104 into the storage space 94. In this case, 104 pressure can be reduced due to the throttling effect of the throttle elements, so that the maximum pressures of the pressure waves can be reduced and areas of the fuel injection system 10, which are acted upon by the fuel with the high pressure, are less heavily loaded.
  • the wall thickness of the extended area 32 is reduced.
  • the wall thickness of the expanded portion 32 and the wall thickness of the nozzle body 66 are approximately equal.
  • the volume of the storage space 94 may be several hundred cubic millimeters in an arrangement according to FIGS. 6a and 6b.
  • FIG. 7 shows a hole nozzle 24 similar to the hole nozzle 24 according to FIGS. 6 a and 6 b, which differs from the embodiment illustrated in FIG. 6 b due to the formation of the sealing region 96.
  • the collar 22 of the sleeve element 78 according to FIG. 7 has an outer annular shoulder 106 pointing in the direction of the bottom 72 of the nozzle body 30. This annular shoulder 106 engages around an inner annular shoulder 108 formed on the widened area 32 of the nozzle body 30.
  • the annular shoulder 108 is pressed outwardly against the annular shoulder 106, so that the sealing effect of the sealing area 96 increases with increasing pressures in the storage space 94.
  • the sleeve member 78 and the nozzle body 30 have been connected to each other via a press fit formed in the respective seal portion 96.
  • the radially expanded portion 32 at its fuel injection device 18 end facing a radially inwardly facing annular collar 110.
  • On the cylindrical portion 80 of the sleeve member 78 is an outwardly facing, at least partially annular locking element 112 is arranged.
  • hole throttles 120 can also be provided for the hydraulic connection between the nozzle needle chamber 34 and the storage space 94, which are preferably arranged in the cylindrical section 80 of the sleeve element 78.
  • hole throttles 120 can also be provided for the hydraulic connection between the nozzle needle chamber 34 and the storage space 94, which are preferably arranged in the cylindrical section 80 of the sleeve element 78.
  • such an alternative throttle arrangement can also be used in the embodiments according to FIGS. 4a to 7.
  • hole throttles 120 has the advantage that the throttling effect can be set particularly well.

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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)

Abstract

An orifice nozzle (24) has a nozzle body (30) which has a nozzle needle cavity (34) for supply fuel into the nozzle body (30), a storage cavity (94) is provided which is joined hydraulically by at least one nozzle element to the nozzle needle cavity (34). An independent claim is included for a fuel injection device.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Lochdüse für eine Kraftstoff-Einspritzvorrichtung eines Kraftstoffeinspritzsystems, insbesondere für Verwendung in einem Common-Rail-System, mit einem Düsenkörper, der einen Düsennadelraum aufweist.The invention relates to a hole nozzle for a fuel injection device of a fuel injection system, in particular for use in a common rail system, with a nozzle body having a nozzle needle chamber.

Eine solche Lochdüse ist beispielsweise aus dem Buch "Dieselmotor-Management" der Robert Bosch GmbH bekannt. Um Kraftstoff fein zerstäubt in einen zugeordneten Brennraum einer Brennkraftmaschine einspritzen zu können, wird der in einem Kraftstoffspeicher, beispielsweise einem "Rail" gespeicherte Kraftstoff auf sehr hohe Drücke gebracht. Frühere Common-Rail-Systeme sind dabei auf einen Maximaldruck von ca. 1350 bar ausgelegt worden. Aktuelle Common-Rail-Systeme arbeiten bei einem Maximaldruck von 1600 bar. Für zukünftige Anwendungen werden noch weit höhere Drücke angestrebt.Such a perforated nozzle is known for example from the book "Diesel Engine Management" Robert Bosch GmbH. In order to inject fuel finely atomized into an associated combustion chamber of an internal combustion engine, the stored in a fuel storage, such as a "rail" fuel is brought to very high pressures. Earlier common-rail systems have been designed for a maximum pressure of approx. 1350 bar. Current common-rail systems operate at a maximum pressure of 1600 bar. For future applications, much higher pressures are desired.

Die in der Lochdüse angeordnete Düsennadel wirkt beim Öffnen und Schließen, d.h. beim Abheben aus einem zugeordneten Düsennadelsitz und beim Schließen desselben, als Ventil. Bedingt durch die genannten hohen Drücke können ausgehend von der als Ventilkörper wirkenden Düsennadel Druckwellen erzeugt werden, die die oben genannten Maximaldrücke überschreiten können. Hierdurch sind die kraftstoffführenden Bauteile des Common-Rail-Systems hohen Belastungsspitzen ausgesetzt.The nozzle needle arranged in the hole nozzle acts as a valve during opening and closing, ie when lifted from an associated nozzle needle seat and when closing it. Due to the high pressures mentioned, starting from the valve needle acting as a valve body Pressure waves are generated, which may exceed the above maximum pressures. As a result, the fuel-carrying components of the common rail system are exposed to high load peaks.

Es ist deshalb vorgeschlagen worden, die durch das Öffnen und Schließen der Düsennadel verursachten Druckwellen zu kompensieren, indem in dem Speicher des Kraftstoff-Einspritzsystems, also beispielsweise dem "Rail" Kraftstoff so mit Druck beaufschlagt wird, dass eine Druckwellenkompensation erreicht werden kann.It has therefore been proposed to compensate for the pressure waves caused by the opening and closing of the nozzle needle by pressure being applied in the memory of the fuel injection system, for example the "rail" fuel, so that pressure wave compensation can be achieved.

Hiervon ausgehend ist es Aufgabe der Erfindung, ein Kraftstoff-Einspritzsystem zu schaffen, das gegenüber Druckwellen möglichst unempfindlich ist.On this basis, it is an object of the invention to provide a fuel injection system which is as insensitive to pressure waves.

Diese Aufgabe wird durch eine Lochdüse mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben.This object is achieved by a perforated nozzle with the features of claim 1. Advantageous embodiments are specified in the subclaims.

Vorteile der ErfindungAdvantages of the invention

Durch den zusätzlichen, in dem Düsenkörper ausgebildeten Speicherraum, der hydraulisch über mindestens ein Drosselelement mit dem Düsennadelraum verbunden ist, können Druckwellen im Kraftstoff gedämpft werden. Da die Druckwellen durch das Öffnen und Schließen der Düsennadel erzeugt und sich somit vom Düsennadelraum ausgehend ausbreiten, ist es besonders vorteilhaft, dass die Dämpfung der Druckwellen räumlich nahe zu diesem Bereich stattfinden kann.Due to the additional, formed in the nozzle body storage space which is hydraulically connected via at least one throttle element with the nozzle needle chamber, pressure waves in the fuel can be damped. Since the pressure waves generated by the opening and closing of the nozzle needle and thus propagate from the nozzle needle chamber, it is particularly advantageous that the attenuation of the pressure waves can take place spatially close to this area.

Durch die hydraulische Verbindung des Speicherraums mit dem Düsennadelraum mit Hilfe mindestens eines Drosselelements ist gewährleistet, dass die in dem Düsennadelraum und dem Speicherraum anliegenden Drücke zueinander unterschiedlich sein können. Somit bilden der Düsennadelraum und der Speicherraum eigenständige hydraulische Elemente.By the hydraulic connection of the storage space with the nozzle needle chamber by means of at least one throttle element is ensured that in the nozzle needle chamber and the Storage space adjacent pressures can be different from each other. Thus, the nozzle needle space and the storage space form independent hydraulic elements.

Die erfindungsgemäße Lochdüse basiert auf der Idee, dass es möglich ist, in einem Bereich eines Kraftstoff-Einspritzsystems einen auch bei Anliegen eines Maximaldrucks überdimensionierten Materialabschnitt nutzen zu können, um andere, räumlich von diesem Materialabschnitt entfernte Bereiche des Kraftstoff-Einspritzsystems zu entlasten. Somit kann insgesamt ein Kraftstoff-Einspritzsystem geschaffen werden, das besonders robust ist gegenüber hohen Maximalbelastungen, die insbesondere durch Druckwellen hervorgerufen sind.The perforated nozzle according to the invention is based on the idea that it is possible in a region of a fuel injection system to be able to use a material section oversized even when a maximum pressure is applied in order to relieve other regions of the fuel injection system that are spatially remote from this material section. Thus, a total fuel injection system can be created, which is particularly robust against high maximum loads, which are particularly caused by pressure waves.

Die erfindungsgemäßen Weiterbildungen gemäß Anspruch 2 und 3 haben den Vorteil, dass das den Speicherraum begrenzende Material gleichmäßig belastet werden kann, wobei gleichzeitig ein vergleichsweise großer Speicherraum geschaffen wird.The developments of the invention according to claim 2 and 3 have the advantage that the storage space limiting material can be uniformly loaded, at the same time a comparatively large storage space is created.

In den Unteransprüchen 4 bis 7 sind Ausführungsformen der Erfindung vorgeschlagen, mit denen eine besonders einfache Fertigung einer erfindungsgemäßen Lochdüse mit Speicherraum ermöglicht wird.In the dependent claims 4 to 7 embodiments of the invention are proposed with which a particularly simple production of a perforated nozzle according to the invention with storage space is made possible.

Die Erfindung betrifft ferner eine Kraftstoff-Einspritzvorrichtung eines Kraftstoff-Einspritzsystems mit einer Lochdüse.The invention further relates to a fuel injection device of a fuel injection system with a hole nozzle.

Zeichnungendrawings

Nachfolgend werden besonders bevorzugte Ausführungsbeispiele der vorliegenden Erfindung unter Bezugnahme auf die beiliegende Zeichnung näher erläutert. In der Zeichnung zeigen:

Figur 1
eine schematische Darstellung eines Kraftstoff-Einspritzsystems einer Brennkraftmaschine mit einer Kraftstoff-Einspritzvorrichtung, die eine Lochdüse aufweist;
Figur 2
eine Seitenansicht der Kraftstoff-Einspritzvorrichtung und der Lochdüse gemäß Figur 1;
Figur 3
eine geschnittene Seitenansicht eines Ausschnitts III gemäß Figur 2 mit einer aus dem Stand der Technik bekannten Lochdüse;
Figur 4a
eine perspektivische Ansicht eines Düsenkörpers einer erfindungsgemäßen Lochdüse;
Figur 4b
eine perspektivische Ansicht eines in den Düsenkörper gemäß Figur 4a einsetzbaren Hülsenelements;
Figur 5a
eine der Figur 4a entsprechende, geschnittene Ansicht;
Figur 5b
eine der Figur 4b entsprechende, geschnittene Ansicht;
Figur 6a
den Düsenkörper gemäß Figur 4a bzw. Figur 5a und das Hülsenelement gemäß Figur 4b bzw. Figur 5b in einem montierten Zustand;
Figur 6b
eine perspektivische Ansicht eines Ausschnitts aus Figur 6a;
Figur 7
eine der Figur 6b entsprechende Ansicht gemäß einer zweiten Ausführungsform der Erfindung; und
Figur 8
eine einem Ausschnitt der Figur 6a entsprechende Ansicht einer dritten Ausführungsform der Erfindung.
Hereinafter, particularly preferred embodiments of the present invention below With reference to the accompanying drawings explained in more detail. In the drawing show:
FIG. 1
a schematic representation of a fuel injection system of an internal combustion engine having a fuel injection device having a hole nozzle;
FIG. 2
a side view of the fuel injection device and the hole nozzle according to Figure 1;
FIG. 3
a sectional side view of a section III of Figure 2 with a known from the prior art hole nozzle;
FIG. 4a
a perspective view of a nozzle body of a perforated nozzle according to the invention;
FIG. 4b
a perspective view of an insertable into the nozzle body according to Figure 4a sleeve member;
FIG. 5a
a sectional view corresponding to Figure 4a;
FIG. 5b
a sectional view corresponding to Figure 4b;
FIG. 6a
the nozzle body according to FIG. 4a or FIG. 5a and the sleeve element according to FIG. 4b or FIG. 5b in an assembled state;
FIG. 6b
a perspective view of a section of Figure 6a;
FIG. 7
a view corresponding to Figure 6b according to a second embodiment of the invention; and
FIG. 8
a view corresponding to a detail of Figure 6a of a third embodiment of the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Figur 1 trägt ein Kraftstoff-Einspritzsystem einer Brennkraftmaschine insgesamt das Bezugszeichen 10. Es umfasst einen Kraftstoffbehälter 12, aus dem ein Fördersystem 14 den Kraftstoff zu einer Kraftstoff-Sammelleitung ("Rail") 16 fördert. Das Fördersystem 14 kann eine Vorförderpumpe und eine Hochdruckpumpe umfassen.In FIG. 1, a fuel injection system of an internal combustion engine as a whole carries the reference numeral 10. It comprises a fuel tank 12, from which a delivery system 14 delivers the fuel to a fuel rail 16 ("rail"). The conveyor system 14 may include a prefeed pump and a high pressure pump.

An die Kraftstoff-Sammelleitung 16 sind mehrere Kraftstoff-Einspritzvorrichtungen 18 angeschlossen, von denen in Figur 1 nur eine dargestellt ist. Hierzu verfügt die Kraftstoff-Einspritzvorrichtung 18 über einen Hochdruckanschluss 20. die Kraftstoff-Einspritzvorrichtung 18 ist einem Brennraum 22 einer nicht weiter dargestellten Brennkraftmaschine zugeordnet, in den sie den Kraftstoff mit Hilfe einer weiter unten noch detaillierter beschriebenen Lochdüse 24 direkt einspritzt. Von der Kraftstoff-Einspritzvorrichtung 18 führt eine Rücklaufleitung 26 zum Kraftstoffbehälter 12 zurück. Die Rücklaufleitung 26 ist über einen Niederdruckanschluss 28 an die Kraftstoff-Einspritzvorrichtung 18 angeschlossen.To the fuel manifold 16 a plurality of fuel injection devices 18 are connected, of which only one is shown in FIG. For this purpose, the fuel injection device 18 has a high-pressure port 20. the fuel injection device 18 is assigned to a combustion chamber 22 of an internal combustion engine, not shown, into which it directly injects the fuel using a hole nozzle 24 described in more detail below. From the fuel injection device 18, a return line 26 leads back to the fuel tank 12. The return line 26 is connected to the fuel injection device 18 via a low pressure port 28.

Die Kraftstoff-Einspritzvorrichtung 18 und die daran montierte Lochdüse 24 sind in Figur 2 detaillierter dargestellt. Der in Figur 2 markierte Ausschnitt III ist in Figur 3 vergrößert dargestellt. Die Lochdüse 24 weist einen länglichen Düsenkörper 30 auf, der an seinem der Kraftstoff-Einspritzvorrichtung 18 zugewandten Ende einen radial nach außen erweiterten Bereich 32 aufweist. In dem Düsenkörper ist ein zentrisch angeordneter Düsennadelraum 34 vorgesehen, in dem eine Düsennadel 36 angeordnet ist. Die Düsennadel 36 öffnet und schließt einen am Ende des Düsennadelraums 34 vorgesehenen Düsennadelsitz 38.The fuel injector 18 and the orifice nozzle 24 mounted thereon are shown in more detail in FIG. The marked in Figure 2 section III is shown in Figure 3 enlarged. The hole nozzle 24 has a elongated nozzle body 30, which has at its fuel injector 18 end facing a radially outwardly extended portion 32. In the nozzle body, a centrally arranged nozzle needle chamber 34 is provided, in which a nozzle needle 36 is arranged. The nozzle needle 36 opens and closes a nozzle needle seat 38 provided at the end of the nozzle needle space 34.

Der radial erweiterte Bereich 32 weist auf seiner der Kraftstoff-Einspritzvorrichtung 18 abgewandten Seite eine ringförmige Düsenkörperschulter 40 auf, die mit einem entsprechenden ringförmigen Absatz 42 einer Düsenspannmutter 44 zusammenwirkt. Die Düsenspannmutter 44 ist über ein in Figur 3 nicht weiter dargestelltes Gewinde an der Kraftstoff-Einspritzvorrichtung 18 gesichert. Mit Hilfe des Absatzes 42 wird die Düsenkörperschulter 40 und somit der radial erweiterte Bereich 32 gegen ein in Figur 3 oberhalb der Lochdüse 24 dargestelltes Zwischenelement 46 gedrückt.The radially widened region 32 has, on its side facing away from the fuel injection device 18, an annular nozzle body shoulder 40, which cooperates with a corresponding annular shoulder 42 of a nozzle retaining nut 44. The nozzle retaining nut 44 is secured to the fuel injector 18 via a thread, not further shown in FIG. With the help of paragraph 42, the nozzle body shoulder 40 and thus the radially expanded portion 32 is pressed against a in Fig. 3 above the hole nozzle 24 shown intermediate member 46.

An das Zwischenelement 46 (Drosselplatte) schließt sich eine Ventilplatte 48 an, die ein insgesamt mit 50 bezeichnetes Ventil aufweist. Das Ventil 50 kann mit Hilfe eines bekannten und daher nicht weiter dargestellten Aktors in mit 52 bezeichneten Betätigungsrichtungen bewegt werden, um das Ventil 50 zu öffnen oder zu schließen.The intermediate element 46 (throttle plate) is adjoined by a valve plate 48, which has a valve designated overall by 50. The valve 50 can be moved by means of a known and therefore not further shown actuator in 52 directions of actuation directions to open the valve 50 or close.

Das Ventil 50 steht über eine in der Figur 3 nicht dargestellte Ablaufdrossel mit einem Steuerraum 54 hydraulisch in Verbindung. Der Steuerraum 54 ist im Wesentlichen begrenzt durch das in Figur 3 obere Ende der Düsennadel 36 und das Zwischenelement 46. In den Steuerraum 54 mündet eine Zulaufdrossel 56, die mit Hilfe eines Kraftstoffzulaufs 58 mit Kraftstoff gespeist wird. Der Kraftstoffzulauf 58 ist auch hydraulisch mit dem Düsennadelraum 34 verbunden. Zwischen dem Ventil 50 und dem Düsennadelraum 34 ist eine weitere Leitung 60 vorgesehen.The valve 50 is hydraulically connected via a flow restrictor (not shown in FIG. 3) to a control chamber 54. The control chamber 54 is essentially limited by the upper end of the nozzle needle 36 and the intermediate element 46 in FIG. 3. An inlet throttle 56, which is supplied with fuel by means of a fuel inlet 58, opens into the control chamber 54. The fuel inlet 58 is also hydraulically with the Düsennadelraum 34 connected. Between the valve 50 and the nozzle needle chamber 34, a further line 60 is provided.

Um die Düsennadel 36 aus ihrem Düsennadelsitz 38 zu heben, so dass eine Einspritzung in den in Figur 1 dargestellten Brennraum 22 stattfinden kann, wird das Ventil 50 geöffnet, so dass Kraftstoff aus dem Steuerraum 54 über die nicht dargestellte Ablaufdrossel abfließen kann. Gleichzeitig fließt durch die Zulaufdrossel 56 Kraftstoff in den Steuerraum 54. Wenn die Drosselwirkung der nicht dargestellten Ablaufdrossel kleiner ist als die Drosselwirkung der Zulaufdrossel 56, kann der Druck im Steuerraum 54 abgebaut werden. Ab einem bestimmten Druckabfall kann mit Hilfe des im Düsennadelraum 34 anliegenden höheren Drucks die Düsennadel 36 entgegen der Wirkung eines Federelements 62 aus dem Düsennadelsitz 38 gehoben werden, so dass eine Einspritzung in den Brennraum 22 erfolgt.In order to lift the nozzle needle 36 out of its nozzle needle seat 38, so that injection into the combustion chamber 22 shown in FIG. 1 can take place, the valve 50 is opened, so that fuel can flow out of the control chamber 54 via the outlet throttle (not shown). At the same time, fuel flows through the inlet throttle 56 into the control chamber 54. If the throttling effect of the outlet throttle (not shown) is smaller than the throttle effect of the inlet throttle 56, the pressure in the control chamber 54 can be reduced. From a certain pressure drop, the nozzle needle 36 can be lifted out of the nozzle needle seat 38 against the action of a spring element 62 with the aid of the higher pressure applied in the nozzle needle chamber 34, so that injection takes place into the combustion chamber 22.

Der Steuerraum 54 ist gegenüber dem Düsennadelraum 34 nach radial außen mit Hilfe eines Hülsenelements 64 (Steuerraumhülse) abgedichtet, das dichtend an dem Zwischenelement 46 anliegt. An diesem Hülsenelement 64 stützt sich das in Figur 3 als Schraubenfeder ausgebildete Federelement 62 ab. Alternativ könnte das Federelement 62 auch als zylindrische Hülse ausgebildet sein, wie sie in der DE 102 13 382 A1 beschrieben ist. Diese Möglichkeit besteht auch für die nachfolgend beschriebene, erfindungsgemäße Lochdüse.The control chamber 54 is sealed relative to the nozzle needle chamber 34 radially outward by means of a sleeve member 64 (control chamber sleeve), which bears sealingly against the intermediate element 46. At this sleeve member 64 is formed in Figure 3 as a helical spring spring member 62 from. Alternatively, the spring element 62 could also be formed as a cylindrical sleeve, as shown in the DE 102 13 382 A1 is described. This possibility also exists for the hole nozzle according to the invention described below.

In Figuren 4a und 5a ist der Düsenkörper 30 einer erfindungsgemäßen Lochdüse 24 dargestellt. Dieser Düsenkörper 30 weist einen vergleichsweise schlanken Düsenkörperschaft 66 auf, an den sich ein nach radial außen gestufter Abschnitt 68 anschließt, an den sich wiederum der nach radial außen erweiterte Bereich 32 anschließt. Die Wandung des radial nach außen erweiterten Bereichs 32 begrenzt einen im Wesentlichen zylindrischen Raum 70. Dieser Raum 70 ist zum Düsenkörperschaft 66 hin durch einen ringförmigen Boden 72 begrenzt.FIGS. 4a and 5a show the nozzle body 30 of a hole nozzle 24 according to the invention. This nozzle body 30 has a comparatively slender nozzle body shaft 66, to which a radially outwardly stepped portion 68 connects, to which in turn the radially outwardly extended region 32 connects. The wall of the radially outwardly widened region 32 delimits a substantially cylindrical space 70. This space 70 is limited to the nozzle body shaft 66 by an annular bottom 72.

Der radial erweiterte Bereich 32 weist zwei sich im Wesentlichen in Längsrichtung des Düsenkörpers 30 erstreckende, teilzylindrische Vertiefungen 74 auf. Die Vertiefungen 74 sind zueinander um ein von 180° abweichendes Maß versetzt, um entsprechend angeordnete Stifte, die in dem Zwischenelement 46 gemäß Figur 3 angeordnet sind, aufzunehmen. Auf diese Weise kann die Lochdüse 24 in einer bestimmten Drehlage an der Kraftstoff-Einspritzvorrichtung 18 montiert werden.The radially widened region 32 has two part-cylindrical depressions 74 extending essentially in the longitudinal direction of the nozzle body 30. The depressions 74 are offset from one another by a distance deviating from 180 ° in order to receive correspondingly arranged pins which are arranged in the intermediate element 46 according to FIG. In this way, the hole nozzle 24 can be mounted in a certain rotational position on the fuel injection device 18.

Am in Figur 4a und 5a oberen Rand des radial erweiterten Bereichs 32 ist eine ringförmige, äußere Kontaktfläche 76 ausgebildet. Diese dichtet den Raum 70 gegen das Zwischenelement 46 ab.At the upper edge of the radially expanded region 32 in FIGS. 4a and 5a, an annular, outer contact surface 76 is formed. This seals the space 70 against the intermediate element 46.

In den Figuren 4b und 5b ist ein Hülsenelement 78 dargestellt, das im Wesentlichen einen hohlzylindrischen Abschnitt 80 aufweist, an den sich ein nach radial außen erweiternder Kragen 82 anschießt. Der Kragen bildet eine ringförmige, innere Kontaktfläche 84 aus, die das Hülsenelement 78 gegen das Zwischenelement 46 abdichten kann.FIGS. 4b and 5b show a sleeve element 78 which essentially has a hollow-cylindrical section 80, against which a collar 82 which widens radially outward is fired. The collar forms an annular, inner contact surface 84, which can seal the sleeve member 78 against the intermediate member 46.

In dem Kragen 82 sind Aussparungen 86 vorgesehen, die zu den die Vertiefungen 74 bildenden Materialabschnitten des radial erweiterten Bereichs 32 des Düsenkörpers 30 komplimentär ausgebildet sind.In the collar 82 recesses 86 are provided, which are complementary to the recesses 74 forming material portions of the radially enlarged portion 32 of the nozzle body 30 are formed.

In Figur 6a ist eine teilmontierte Lochdüse 24 dargestellt, wobei das Hülsenelement 78 gemäß Figuren 4b und 5b in dem Düsenkörper 30 gemäß Figuren 4b und 5b montiert ist. Der radial nach außen erweiterte Bereich 32 des Düsenkörpers 30 weist eine nach radial innen weisende, zylindrische Wandung 88 auf. In entsprechender Weise weist der zylindrische Abschnitt 80 des Hülsenelements 78 eine radial nach außen weisende Wandung 90 auf. Ferner weist der Kragen 82 des Hülsenelements 78 eine zum ringförmigen Boden 72 des Düsenkörpers 30 gewandte Wandung 92 auf. Die Wandungen 88, 90, 92 und der ringförmige Boden 72 begrenzen einen insgesamt ringförmig ausgebildeten Speicherraum 94, der konzentrisch zu dem Düsennadelraum 34 angeordnet ist. Der Düsennadelraum 34 wird entlang seines Verlaufs von dem Düsenkörperschaft 66 und dem gestuften Abschnitt 68 des Düsenkörpers 30 und durch den zylindrischen Abschnitt 80 des Hülsenelements 78 begrenzt.FIG. 6 a shows a partially mounted hole nozzle 24, wherein the sleeve element 78 according to FIGS. 4 b and 5 b is mounted in the nozzle body 30 according to FIGS. 4 b and 5 b. The radially outwardly widened region 32 of the nozzle body 30 has a radially inwardly facing cylindrical wall 88. Correspondingly, the cylindrical portion 80 of the sleeve member 78 has a radially outwardly facing wall 90. Furthermore, the collar 82 of the sleeve member 78 has a wall 92 facing the annular bottom 72 of the nozzle body 30. The walls 88, 90, 92 and the annular bottom 72 define a generally annular formed storage space 94 which is arranged concentrically to the nozzle needle space 34. The nozzle needle space 34 is bounded along its course by the nozzle body 66 and the stepped portion 68 of the nozzle body 30 and by the cylindrical portion 80 of the sleeve member 78.

Gemäß Figur 6b ist zwischen dem Kragen 22 und dem radial erweiterten Bereich 32 ein erster, im wesentlichen zylindrischer Dichtbereich 96 ausgebildet. Ferner ist zwischen dem zylindrischen Abschnitt 80 und dem Düsenkörper 30 ein weiterer, mit 98 bezeichneter Dichtbereich ausgebildet. Der Dichtbereich 98 entsteht durch Anlage eines ringförmigen Rands 100 (vergleiche Figur 5b) des Hülsenelement 78 mit einem inneren Abschnitt 102 des ringförmigen Bodens 72 (vergleiche Figur 5a).According to FIG. 6b, a first, essentially cylindrical sealing region 96 is formed between the collar 22 and the radially widened region 32. Further, between the cylindrical portion 80 and the nozzle body 30, another, designated 98 sealing region is formed. The sealing region 98 is formed by abutment of an annular rim 100 (see FIG. 5b) of the sleeve element 78 with an inner section 102 of the annular bottom 72 (see FIG. 5a).

Über den Dichtbereich 96 ist der Speicherraum 94 in Richtung auf das Zwischenelement 46 gemäß Figur 3 abgedichtet.Via the sealing region 96, the storage space 94 is sealed in the direction of the intermediate element 46 according to FIG.

In dem Dichtbereich 98 sind Drosselelemente 104 dadurch ausgebildet, dass in dem zylindrischen Abschnitt 80 des Hülsenelements 78 kleine Materialaussparungen vorgesehen sind. Diese Materialaussparungen verbinden den Düsennadelraum 34 hydraulisch mit dem Speicherraum 94. Durch die Kombination mindestens eines Drosselelements 104 mit dem Dichtbereich 98 kann eine definierte Drosselwirkung beim Strömen von Kraftstoff zwischen dem Düsennadelraum 34 und dem Speicherraum 94 erzielt werden.In the sealing region 98 throttle elements 104 are formed by 78 provided in the cylindrical portion 80 of the sleeve member small material recesses are. By means of the combination of at least one throttle element 104 with the sealing region 98, a defined throttle effect can be achieved when fuel flows between the nozzle needle chamber 34 and the reservoir 94.

Der Speicherraum 94 hat folgende Funktion: Wenn in dem Düsennadelraum 34 einer erfindungsgemäßen Lochdüse 24 die Düsennadel 36 aus ihrem Düsennadelsitz 38 herausbewegt wird, kann unter Hochdruck stehender Kraftstoff aus dem Düsennadelraum 34 in den Brennraum 22 (vergleiche Figur 1) eingespritzt werden. Wenn die Düsennadel 36 sich nun wieder in Schließstellung bewegt, so dass der Düsennadelsitz 38 geschlossen wird, entsteht eine Druckwelle, die durch den im Düsennadelraum 34 anliegenden Kraftstoff übertragen wird. Diese Druckwelle kann um ein erhebliches Maß dadurch gedämpft werden, dass Kraftstoff aus dem Düsennadelraum 34 über die Drosselelemente 104 in den Speicherraum 94 strömt. Dabei kann aufgrund der Drosselwirkung der Drosselelemente 104 Druck abgebaut werden, so dass die maximalen Drücke der Druckwellen verkleinert werden können und Bereiche des Kraftstoff-Einspritzsystems 10, die über den Kraftstoff mit den Hochdruck beaufschlagt sind, weniger stark belastet sind.The storage space 94 has the following function: If the nozzle needle 36 is moved out of its nozzle needle seat 38 in the nozzle needle chamber 34 of a perforated nozzle 24 according to the invention, high-pressure fuel can be injected from the nozzle needle chamber 34 into the combustion chamber 22 (see FIG. 1). When the nozzle needle 36 now moves back into the closed position, so that the nozzle needle seat 38 is closed, creates a pressure wave, which is transmitted through the applied fuel in the nozzle needle chamber 34. This pressure wave can be damped to a considerable extent by the fact that fuel flows from the nozzle needle chamber 34 via the throttle elements 104 into the storage space 94. In this case, 104 pressure can be reduced due to the throttling effect of the throttle elements, so that the maximum pressures of the pressure waves can be reduced and areas of the fuel injection system 10, which are acted upon by the fuel with the high pressure, are less heavily loaded.

Wenn der Speicherraum 94, so wie in den Figuren 6a und 6b dargestellt, in dem radial erweiterten Bereich 32 des Düsenkörpers 30 ausgebildet ist, wird die Wandstärke des erweiterten Bereichs 32 verkleinert. Somit ist die Wandstärke des erweiterten Bereichs 32 und die Wandstärke des Düsenkörperschafts 66 in etwa gleich. Somit kann der Bauraum, der insgesamt von dem Düsenkörper 30 eingenommen wird, so genutzt werden, dass die Lochdüse 24 insgesamt hohen Drücken standhalten kann, jedoch die maximalen Druckbelastungen, die durch Druckwellen erzeugt werden, abgebaut werden, so dass auch andere Bauteile, beispielsweise die Kraftstoff-Einspritzvorrichtung 18 niedrigeren Spitzenbelastungen ausgesetzt sind. Das Volumen des Speicherraums 94 kann bei einer Anordnung gemäß Figuren 6a und 6b mehrere 100 Kubikmillimeter betragen.When the storage space 94, as shown in FIGS. 6a and 6b, is formed in the radially expanded area 32 of the nozzle body 30, the wall thickness of the extended area 32 is reduced. Thus, the wall thickness of the expanded portion 32 and the wall thickness of the nozzle body 66 are approximately equal. Thus, the space taken up by the nozzle body 30 as a whole, can be used so that the hole nozzle 24 can withstand high pressures, but the maximum Pressure loads generated by pressure waves are degraded, so that other components, such as the fuel injector 18 are exposed to lower peak loads. The volume of the storage space 94 may be several hundred cubic millimeters in an arrangement according to FIGS. 6a and 6b.

Figur 7 zeigt einen zu der Lochdüse 24 gemäß Figuren 6a und 6b ähnliche Lochdüse 24, die sich durch die Ausbildung des Dichtbereichs 96 von der in Figur 6b dargestellten Ausführung unterscheidet. Der Kragen 22 des Hülsenelements 78 gemäß Figur 7 weist eine in Richtung auf den Boden 72 des Düsenkörpers 30 weisende, äußere Ringschulter 106 auf. Diese Ringschulter 106 umgreift eine an dem erweiterten Bereich 32 des Düsenkörpers 30 ausgebildete, innenliegende Ringschulter 108. Wenn der in dem Speicherraum 94 enthaltene Kraftstoff mit hohem Druck beaufschlagt ist, wird die Ringschulter 108 nach außen gegen die Ringschulter 106 gedrückt, so dass sich die Dichtwirkung des Dichtbereichs 96 bei zunehmenden Drücken im Speicherraum 94 erhöht.FIG. 7 shows a hole nozzle 24 similar to the hole nozzle 24 according to FIGS. 6 a and 6 b, which differs from the embodiment illustrated in FIG. 6 b due to the formation of the sealing region 96. The collar 22 of the sleeve element 78 according to FIG. 7 has an outer annular shoulder 106 pointing in the direction of the bottom 72 of the nozzle body 30. This annular shoulder 106 engages around an inner annular shoulder 108 formed on the widened area 32 of the nozzle body 30. When the fuel contained in the storage space 94 is subjected to high pressure, the annular shoulder 108 is pressed outwardly against the annular shoulder 106, so that the sealing effect of the sealing area 96 increases with increasing pressures in the storage space 94.

Bei den bisher beschriebenen Ausführungsformen wurden das Hülsenelement 78 und der Düsenkörper 30 über einen Presssitz miteinander verbunden, der in dem jeweiligen Dichtbereich 96 ausgebildet ist. Es ist jedoch auch möglich, das Hülsenelement 78 rastend mit dem Düsenkörper 30 zu verbinden, wie in Figur 8 dargestellt. Bei dieser Ausführungsform weist der radial erweiterte Bereich 32 an seinem der Kraftstoff-Einspritzvorrichtung 18 zugewandten Ende einen nach radial innen weisenden, ringförmigen Kragen 110 auf. An dem zylindrischen Abschnitt 80 des Hülsenelements 78 ist ein nach außen weisendes, zumindest abschnittsweise ringförmiges Rastelement 112 angeordnet.In the embodiments described so far, the sleeve member 78 and the nozzle body 30 have been connected to each other via a press fit formed in the respective seal portion 96. However, it is also possible to connect the sleeve member 78 latching with the nozzle body 30, as shown in Figure 8. In this embodiment, the radially expanded portion 32 at its fuel injection device 18 end facing a radially inwardly facing annular collar 110. On the cylindrical portion 80 of the sleeve member 78 is an outwardly facing, at least partially annular locking element 112 is arranged.

Wenn das Hülsenelement 78 in mit 114 bezeichneter Montagerichtung in den Düsenkörper 30 eingesetzt wird, gelangen Führungsschrägen 116 der Rastelemente 112 in Anlage mit dem Kragen 110 des radial erweiterten Bereichs 32. Hierdurch kann das Hülsenelement nach radial innen zusammengedrückt werden, bis die Rastelemente 112 den Kragen 110 hintergreifen. In dieser Stellung ist zwischen einem Endbereich 118 des zylindrischen Abschnitts 80 des Hülsenelements 78 und dem Kragen 110 des radial erweiterten Bereichs 32 ein Dichtbereich 96 ausgebildet. Die Abdichtung des zylindrischen Abschnitts 80 gegenüber dem Boden 72 des Düsenkörpers 30 erfolgt in der mit Bezug auf Figuren 5a bis 6b beschriebenen Weise. Anstelle oder zusätzlich zu den bereits beschriebenen Drosselelementen 104 können zur hydraulischen Verbindung zwischen dem Düsennadelraum 34 und dem Speicherraum 94 auch Lochdrosseln 120 vorgesehen sein, die vorzugsweise in dem zylindrischen Abschnitt 80 des Hülsenelements 78 angeordnet sind. Eine solche alternative Drosselanordnung kann selbstverständlich auch bei den Ausführungsformen gemäß Figuren 4a bis 7 zum Einsatz kommen.When the sleeve member 78 is inserted into the nozzle body 30 in the mounting direction denoted 114, guide bevels 116 of the detents 112 engage the collar 110 of the radially expanded portion 32. This allows the sleeve member to be compressed radially inwardly until the detents 112 engage the collar 110 behind. In this position, a sealing region 96 is formed between an end portion 118 of the cylindrical portion 80 of the sleeve member 78 and the collar 110 of the radially expanded portion 32. The sealing of the cylindrical portion 80 with respect to the bottom 72 of the nozzle body 30 is carried out in the manner described with reference to Figures 5a to 6b. Instead of or in addition to the throttle elements 104 already described, hole throttles 120 can also be provided for the hydraulic connection between the nozzle needle chamber 34 and the storage space 94, which are preferably arranged in the cylindrical section 80 of the sleeve element 78. Of course, such an alternative throttle arrangement can also be used in the embodiments according to FIGS. 4a to 7.

Die Verwendung von Lochdrosseln 120 hat den Vorteil, dass sich die Drosselwirkung besonders gut einstellen lässt.The use of hole throttles 120 has the advantage that the throttling effect can be set particularly well.

Claims (10)

Lochdüse (24) für eine Kraftstoff-Einspritzvorrichtung (18) eines Kraftstoff-Einspritzsystems (10), insbesondere zur Verwendung in einem Common-Rail-System, mit einem Düsenkörper (30), der einen Düsennadelraum (34) aufweist, dadurch gekennzeichnet, dass zum Speichern von Kraftstoff in dem Düsenkörper (30) ein Speicherraum (94) vorgesehen ist, der hydraulisch über mindestens ein Drosselelement (104, 120) mit dem Düsennadelraum (34) verbunden ist.A hole nozzle (24) for a fuel injection device (18) of a fuel injection system (10), in particular for use in a common rail system, comprising a nozzle body (30) having a nozzle needle space (34), characterized in that for storing fuel in the nozzle body (30) a storage space (94) is provided, which is hydraulically connected via at least one throttle element (104, 120) with the nozzle needle chamber (34). Lochdüse (24) nach Anspruch 1, dadurch gekennzeichnet, dass der Speicherraum (94) in einem Bereich (32) des Düsenkörpers (30) angeordnet ist, der zur Ausbildung einer Düsenkörperschulter (40) nach radial außen erweitert ist.Punch nozzle (24) according to claim 1, characterized in that the storage space (94) in a region (32) of the nozzle body (30) is arranged, which is widened to form a nozzle body shoulder (40) radially outward. Lochdüse (24) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Speicherraum (94) ringförmig ausgebildet ist und insbesondere konzentrisch zum Düsennadelraum (34) angeordnet ist.Punch nozzle (24) according to claim 1 or 2, characterized in that the storage space (94) is annular and in particular is arranged concentrically to the nozzle needle chamber (34). Lochdüse (24) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Speicherraum (94) in radialer Richtung durch eine Wandung (88) des Düsenkörpers (30) und durch eine Wandung (90) eines mit dem Düsenkörper (30) verbundenen Hülsenelements (78) begrenzt ist.Punch nozzle (24) according to at least one of the preceding claims, characterized in that the storage space (94) in the radial direction through a wall (88) of the nozzle body (30) and through a wall (90) of a sleeve member connected to the nozzle body (30) (78) is limited. Lochdüse (24) nach Anspruch 4, dadurch gekennzeichnet, dass die Wandung (68) des Düsenkörpers (30) radial außen und die Wandung (90) des Hülsenelements (78) radial innen angeordnet ist.Punch nozzle (24) according to claim 4, characterized in that the wall (68) of the nozzle body (30) is arranged radially on the outside and the wall (90) of the sleeve element (78) radially inwards. Lochdüse (24) nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das Hülsenelement (78) und der Düsenkörper (30) über einen Presssitz miteinander verbunden sind.Punch nozzle (24) according to claim 4 or 5, characterized in that the sleeve member (78) and the nozzle body (30) are interconnected via a press fit. Lochdüse (24) nach mindestens einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass das Hülsenelement (78) und der Düsenkörper (30) über eine Rastverbindung miteinander verbunden sind.Punch nozzle (24) according to at least one of claims 4 to 6, characterized in that the sleeve member (78) and the nozzle body (30) are interconnected via a latching connection. Lochdüse (24) nach mindestens einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass ein zwischen dem Hülsenelement (78) und dem Düsenkörper (30) ausgebildeter Dichtbereich (96) derart ausgebildet sind, dass sich dessen Dichtwirkung bei einer Erhöhung des Drucks des in dem Speicherraum (94) vorhandenen Kraftstoffs erhöht.Punch nozzle (24) according to at least one of claims 4 to 7, characterized in that between the sleeve member (78) and the nozzle body (30) formed sealing region (96) are formed such that its sealing effect at an increase in the pressure of in increases the storage space (94) existing fuel. Lochdüse (24) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Drosselelement (104) durch zwei in einem drosselnd wirkenden Bereich zueinander beabstandete, unterschiedliche Bauteile, insbesondere durch Düsenkörper (30) und Hülsenelement (78), gebildet ist.Punch nozzle (24) according to at least one of the preceding claims, characterized in that the throttle element (104) by two in a throttling acting region spaced apart, different components, in particular by the nozzle body (30) and sleeve member (78) is formed. Kraftstoff-Einspritzvorrichtung (18) eines Kraftstoff-Einspritzsystems (10) mit einer Lochdüse (24) nach mindestens einem der vorhergehenden Ansprüche.Fuel injection device (18) of a fuel injection system (10) with a hole nozzle (24) according to at least one of the preceding claims.
EP06120340A 2005-09-29 2006-09-08 Hole-type nozzle with a storage volume for a fuel injection apparatus Not-in-force EP1770275B1 (en)

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DE102005046669A DE102005046669A1 (en) 2005-09-29 2005-09-29 Hole nozzle for a fuel injection device of a fuel injection system

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008017544A1 (en) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Fuel injection system with a pressure oscillation damper
EP1921306A2 (en) * 2006-11-08 2008-05-14 Robert Bosch Gmbh Injector housing with fuel storage
EP2246552A1 (en) * 2009-04-22 2010-11-03 Delphi Technologies Holding S.à.r.l. Fuel injector
WO2011012519A1 (en) * 2009-07-29 2011-02-03 Delphi Technologies Holding S.À.R.L. Fuel injector
US9897058B2 (en) 2009-07-29 2018-02-20 Delphi International Operations S.A.R.L. Fuel injector
WO2019072604A1 (en) * 2017-10-09 2019-04-18 L'orange Gmbh Fuel injector and injection system for an internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008012637A1 (en) * 2008-03-05 2009-09-10 Robert Bosch Gmbh Fuel injector for injecting fuel into combustion chamber of internal-combustion engine, has injector body, which has fuel inlet, injection opening, nozzle needle and nozzle area

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046602A1 (en) * 2000-12-07 2002-06-13 Robert Bosch Gmbh Fuel injection system for internal combustion engines
WO2002090755A1 (en) * 2001-05-05 2002-11-14 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
WO2004033890A1 (en) * 2002-10-09 2004-04-22 Robert Bosch Gmbh Fuel injection device for an internal combustion engine
FR2862352A1 (en) * 2003-11-14 2005-05-20 Renault Sas Fuel injection device for e.g. diesel engine, has fuel inlet channel with check valve for reflecting primary and one secondary waves, and damping unit with by-pass channel for damping another secondary wave while reaching throttle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046602A1 (en) * 2000-12-07 2002-06-13 Robert Bosch Gmbh Fuel injection system for internal combustion engines
WO2002090755A1 (en) * 2001-05-05 2002-11-14 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
WO2004033890A1 (en) * 2002-10-09 2004-04-22 Robert Bosch Gmbh Fuel injection device for an internal combustion engine
FR2862352A1 (en) * 2003-11-14 2005-05-20 Renault Sas Fuel injection device for e.g. diesel engine, has fuel inlet channel with check valve for reflecting primary and one secondary waves, and damping unit with by-pass channel for damping another secondary wave while reaching throttle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008017544A1 (en) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Fuel injection system with a pressure oscillation damper
EP1921306A2 (en) * 2006-11-08 2008-05-14 Robert Bosch Gmbh Injector housing with fuel storage
EP1921306A3 (en) * 2006-11-08 2009-08-26 Robert Bosch Gmbh Injector housing with fuel storage
EP2246552A1 (en) * 2009-04-22 2010-11-03 Delphi Technologies Holding S.à.r.l. Fuel injector
WO2011012519A1 (en) * 2009-07-29 2011-02-03 Delphi Technologies Holding S.À.R.L. Fuel injector
EP2295787A1 (en) * 2009-07-29 2011-03-16 Delphi Technologies Holding S.à.r.l. Fuel Injector
US9279402B2 (en) 2009-07-29 2016-03-08 Delphi International Operations Luxembourg S.A.R.L. Fuel injector
US9897058B2 (en) 2009-07-29 2018-02-20 Delphi International Operations S.A.R.L. Fuel injector
WO2019072604A1 (en) * 2017-10-09 2019-04-18 L'orange Gmbh Fuel injector and injection system for an internal combustion engine

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EP1770275B1 (en) 2009-12-23
DE102005046669A1 (en) 2007-04-05
ATE453049T1 (en) 2010-01-15
DE502006005720D1 (en) 2010-02-04

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