EP1770275B1 - 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 PDFInfo
- Publication number
- EP1770275B1 EP1770275B1 EP06120340A EP06120340A EP1770275B1 EP 1770275 B1 EP1770275 B1 EP 1770275B1 EP 06120340 A EP06120340 A EP 06120340A EP 06120340 A EP06120340 A EP 06120340A EP 1770275 B1 EP1770275 B1 EP 1770275B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- hole
- nozzle body
- fuel injection
- 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.)
- Not-in-force
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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 F02M39/00Â -Â F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00Â -Â 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/40—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, according to the preamble of claim 1.
- Such a hole nozzle is for example by the WO 2004/033890 A known.
- a known hole nozzle has within the nozzle body on a control chamber which is connected via a flow restrictor with a nozzle needle chamber.
- the control chamber is formed within a sealing sleeve whose sealing edge has the flow restrictor at one point.
- a perforated nozzle in which a damping space in the form of a blind bore is formed in a valve holding body. Via a throttle, the damping chamber is connected to a fuel inlet channel.
- 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 hydraulic connection of the storage space to the nozzle needle space with the aid of at least one throttle element ensures that the pressures in the nozzle needle space and the storage space can be different from each other.
- the nozzle needle space and the storage space form independent hydraulic elements.
- the hole nozzle according to the invention is based on the idea that it is possible to be able to use a section of material oversized even when a maximum pressure is applied in a region of a fuel injection system other areas of the fuel injection system spatially removed from this section of material to relieve.
- 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 collectively the reference numeral 10. It includes a fuel tank 12, from which a conveyor system 14, the fuel to a fuel rail ("rail" 16 promotes.
- the conveyor system 14 may include a prefeed pump and a high pressure pump.
- a plurality of fuel injectors 18 are connected, of which in FIG. 1 only one is shown.
- 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 injection device 18 and the hole nozzle 24 mounted thereon are in FIG FIG. 2 shown in more detail.
- the in FIG. 2 marked section III is in FIG. 3 shown 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 lock nut 44 is a in FIG. 3 not further illustrated threaded secured to the fuel injection device 18. With the help of paragraph 42, the nozzle body shoulder 40 and thus the radially expanded portion 32 against a in FIG. 3 pressed above the hole nozzle 24 shown intermediate element 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 a in the FIG. 3 not shown drain throttle with a control chamber 54 hydraulically connected.
- the control space 54 is substantially limited by the in FIG. 3 upper end of the nozzle needle 36 and the intermediate element 46.
- In the control chamber 54 opens an inlet throttle 56, which is fed by means of a fuel inlet 58 with fuel.
- the fuel inlet 58 is also hydraulically with the Düsennadelraum 34 connected.
- a further line 60 is provided between the valve 50 and the nozzle needle chamber 34.
- the valve 50 is opened so that fuel can flow from 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
- 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 the nozzle body 30 of a perforated nozzle 24 according to the invention is shown.
- 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 recesses 74 are offset from each other by a deviating from 180 ° degree to correspondingly arranged pins in the intermediate element 46 according to FIG. 3 are arranged to record. 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.
- a sleeve member 78 which has a substantially hollow cylindrical portion 80, to which a radially outwardly flared collar 82 shoots.
- 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. 6a a partially mounted hole nozzle 24 is shown, wherein the sleeve member 78 according to FIGS. 4b and 5b in the nozzle body 30 according to FIGS. 4b and 5b is mounted.
- 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.
- FIG. 6b is formed between the collar 22 and the radially expanded portion 32, a first, substantially cylindrical sealing portion 96. Further, between the cylindrical portion 80 and the nozzle body 30, another, designated 98 sealing region is formed. The sealing area 98 is created by the application of an annular rim 100 (cf. FIG. 5b ) of the sleeve member 78 with an inner portion 102 of the annular bottom 72 (see FIG. 5a ).
- 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: When the nozzle needle 36 is moved out of its nozzle needle seat 38 in the nozzle needle chamber 34 of a hole nozzle 24 according to the invention, high-pressure fuel from the nozzle needle chamber 34 into the combustion chamber 22 (cf. FIG. 1 ) are injected. 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 portion 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 memory space 94 may, in an arrangement according to Figures 6a and 6b several hundred cubic millimeters.
- FIG. 7 shows one to the hole nozzle 24 according to Figures 6a and 6b similar hole nozzle 24, which is characterized by the formation of the sealing area 96 of the in FIG. 6b distinguished embodiment.
- the collar 22 of the sleeve member 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.
- Such an alternative throttle arrangement can of course also in the embodiments according to FIGS. 4a to 7 be used.
- 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
Description
Die Erfindung betrifft eine Lochdüse für eine Kraftstoff-Einspritzvorrichtung eines Kraftstoffeinspritzsystems, insbesondere für Verwendung in einem Common-Rail-System, nach dem Oberbegriff von Anspruch 1.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, according to the preamble of claim 1.
Eine derartige Lochdüse ist beispielsweise durch die
Lochdüsen sind 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. 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. 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.Lochdüsen are 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. 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 pressure waves can be generated starting from the valve needle acting as a valve body, which can exceed the above-mentioned maximum pressures. As a result, the fuel-carrying components of the common rail system are exposed to high load peaks. 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.
Die aus der eingangs genannten
Aus der
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.
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.The hydraulic connection of the storage space to the nozzle needle space with the aid of at least one throttle element ensures that the pressures in the nozzle needle space and the storage space 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 hole nozzle according to the invention is based on the idea that it is possible to be able to use a section of material oversized even when a maximum pressure is applied in a region of a fuel injection system other areas of the fuel injection system spatially removed from this section of material to relieve. 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
In den Unteransprüchen 4 bis 6 sind Ausführungsformen der Erfindung vorgeschlagen, mit denen eine besonders einfache Fertigung einer erfindungsgemäßen Lochdüse mit Speicherraum ermöglicht wird.In the dependent claims 4 to 6 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.
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
mit einer aus dem Stand der Technik bekannten Lochdüse;Figur 2 - 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 gemäßFigur 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.
- 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
FIG. 1 ; - FIG. 3
- a sectional side view of a section III according to
FIG. 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 a in the nozzle body according to
FIG. 4a insertable sleeve element; - FIG. 5a
- one of the
FIG. 4a corresponding, cut view; - FIG. 5b
- one of the
FIG. 4b corresponding, cut view; - FIG. 6a
- the nozzle body according to
FIG. 4a respectively.FIG. 5a and the sleeve member according toFIG. 4b respectively.FIG. 5b in an assembled state; - FIG. 6b
- a perspective view of a section
FIG. 6a ; - FIG. 7
- one of the
FIG. 6b corresponding view according to a second embodiment of the invention; and - FIG. 8
- a section of the
FIG. 6a corresponding view of a third embodiment of the invention.
In
An die Kraftstoff-Sammelleitung 16 sind mehrere Kraftstoff-Einspritzvorrichtungen 18 angeschlossen, von denen in
Die Kraftstoff-Einspritzvorrichtung 18 und die daran montierte Lochdüse 24 sind in
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
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
Das Ventil 50 steht über eine in der
Um die Düsennadel 36 aus ihrem Düsennadelsitz 38 zu heben, so dass eine Einspritzung in den in
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
In
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
Am in
In den
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
In
Gemäß
Über den Dichtbereich 96 ist der Speicherraum 94 in Richtung auf das Zwischenelement 46 gemäß
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
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
Wenn der Speicherraum 94, so wie in den
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
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
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 (9)
- Hole-type nozzle (24) for a fuel injection device (18) of a fuel injection system (10), in particular for use in a common rail system, having a nozzle body (30) which has a nozzle needle chamber (34) and having an accumulator chamber (94) provided in the nozzle body (30) for accumulating fuel, which accumulator chamber (94) is hydraulically connected by means of at least one throttle element (104, 120) to the nozzle needle chamber (34),
characterized
in that the accumulator chamber (94) is bounded in the radial direction by a wall (88) of the nozzle body (30) and by a wall (90) of a sleeve element (78) which is connected to the nozzle body (30). - Hole-type nozzle according to Claim 1, characterized in that the accumulator chamber (94) is arranged in a region (32) of the nozzle body (30), which region (32) is widened in the radially outward direction to form a nozzle body shoulder (40).
- Hole-type nozzle according to Claim 1 or 2, characterized in that the accumulator chamber (94) is of annular design and is in particular arranged concentrically with respect to the nozzle needle chamber (34).
- Hole-type nozzle according to one of the preceding claims, characterized in that the wall (68) of the nozzle body (30) is arranged radially at the outside and the wall (90) of the sleeve element (78) is arranged radially at the inside.
- Hole-type nozzle according to one of the preceding claims, characterized in that the sleeve element (78) and the nozzle body (30) are connected to one another by means of an interference fit.
- Hole-type nozzle according to one of the preceding claims, characterized in that the sleeve element (78) and the nozzle body (30) are connected to one another by means of a latching connection.
- Hole-type nozzle according to one of the preceding claims, characterized in that a sealing region (96) which is formed between the sleeve element (78) and the nozzle body (30) is designed such that its sealing action is increased in the event of an increase in the pressure of the fuel present in the accumulator chamber (94).
- Hole-type nozzle according to one of the preceding claims, characterized in that the throttle element (104) is formed by two different components which are spaced apart from one another in a region which has a throttling action, in particular by the nozzle body (30) and sleeve element (78).
- Fuel injection device (18) of a fuel injection system (10), having a hole-type nozzle (24) according to at least one of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005046669A DE102005046669A1 (en) | 2005-09-29 | 2005-09-29 | Hole nozzle for a fuel injection device of a fuel injection system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1770275A1 EP1770275A1 (en) | 2007-04-04 |
EP1770275B1 true EP1770275B1 (en) | 2009-12-23 |
Family
ID=37533308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06120340A Not-in-force EP1770275B1 (en) | 2005-09-29 | 2006-09-08 | Hole-type nozzle with a storage volume for a fuel injection apparatus |
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Country | Link |
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EP (1) | EP1770275B1 (en) |
AT (1) | ATE453049T1 (en) |
DE (2) | DE102005046669A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006037179A1 (en) * | 2006-08-09 | 2008-02-14 | Robert Bosch Gmbh | Fuel injection system with a pressure vibration damper |
DE102006052636A1 (en) * | 2006-11-08 | 2008-05-15 | Robert Bosch Gmbh | Nozzle body with storage holes |
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 |
EP2246552A1 (en) * | 2009-04-22 | 2010-11-03 | Delphi Technologies Holding S.Ã .r.l. | Fuel injector |
ATE552420T1 (en) | 2009-07-29 | 2012-04-15 | Delphi Tech Holding Sarl | FUEL INJECTOR |
US9897058B2 (en) | 2009-07-29 | 2018-02-20 | Delphi International Operations S.A.R.L. | Fuel injector |
DE102017123416A1 (en) * | 2017-10-09 | 2019-04-11 | Woodward L'orange Gmbh | Fuel injector and injection system for an internal combustion engine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10060811A1 (en) * | 2000-12-07 | 2002-06-13 | Bosch Gmbh Robert | Fuel injection system for internal combustion engines |
DE10121892A1 (en) * | 2001-05-05 | 2002-11-07 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
DE10246974A1 (en) * | 2002-10-09 | 2004-04-22 | Robert Bosch Gmbh | Fuel injector nozzle for use in internal combustion engine has needle and sleeve separately cutting off fuel flow to inner and outer nozzle bores |
FR2862352B1 (en) * | 2003-11-14 | 2006-02-24 | Renault Sas | FUEL INJECTION DEVICE EQUIPPED WITH PRESSURE WAVE DAMPING MEANS |
-
2005
- 2005-09-29 DE DE102005046669A patent/DE102005046669A1/en not_active Withdrawn
-
2006
- 2006-09-08 AT AT06120340T patent/ATE453049T1/en active
- 2006-09-08 EP EP06120340A patent/EP1770275B1/en not_active Not-in-force
- 2006-09-08 DE DE502006005720T patent/DE502006005720D1/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102005046669A1 (en) | 2007-04-05 |
ATE453049T1 (en) | 2010-01-15 |
DE502006005720D1 (en) | 2010-02-04 |
EP1770275A1 (en) | 2007-04-04 |
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