WO2008009511A1 - Fuel injector - Google Patents
Fuel injector Download PDFInfo
- Publication number
- WO2008009511A1 WO2008009511A1 PCT/EP2007/055437 EP2007055437W WO2008009511A1 WO 2008009511 A1 WO2008009511 A1 WO 2008009511A1 EP 2007055437 W EP2007055437 W EP 2007055437W WO 2008009511 A1 WO2008009511 A1 WO 2008009511A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- fuel
- fuel injector
- accumulator
- internal
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
-
- 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 fuel injector according to the preamble of claim 1.
- Fuel injectors for diesel injection are connected via a high-pressure line to an external high-pressure fuel accumulator, which is also referred to as a common rail.
- the connecting lines between the external fuel high pressure accumulator and the fuel injectors lead to a pressure loss.
- the object of the invention is to provide a fuel injector according to the preamble of claim 1, which allows higher injection pressures than conventional fuel injectors.
- the object is with a fuel injector with an injector housing which comprises a pressure chamber from which high-pressure fuel is injected into a combustion chamber of an internal combustion engine and which is connected via a high-pressure passage to a high-pressure connection region which is connected to an external high-pressure fuel accumulator, achieved in that an internal fuel high-pressure accumulator is arranged in the injector housing parallel to the high-pressure passage and / or connected. Due to the hydraulic parallel connection of the internal high-pressure fuel accumulator to the high-pressure passage, pressure surges occurring during operation of the fuel injector can be better damped or absorbed than in the case of a series connection.
- pressure oscillations in the fuel injector and the wear caused thereby, for example on a nozzle needle seat can be significantly reduced.
- pressure oscillations in the fuel injector and the wear caused thereby can be significantly reduced.
- a preferred embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator has a volume of more than 2 cubic centimeters.
- the size of the volume of the internal high-pressure fuel storage depends, among other things, on the nozzle flow rate, the injection quantity and the available installation space.
- a further preferred embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator is connected to the pressure space and / or the high-pressure passage via a pressure-space connecting passage.
- the pressure chamber connection channel creates a direct connection between the internal high-pressure fuel accumulator and the high-pressure channel and / or the pressure chamber.
- a further preferred embodiment of the fuel injector is characterized in that the pressure chamber connecting passage has a throttle.
- the throttle absorbs and / or dampens pressure surges that can be caused by the start of injection and the end of injection. By throttling pressure energy is dissipated at the throttle.
- Another preferred exemplary embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator is connected to the high-pressure connection region via a connection connecting duct.
- the port connection channel provides a direct connection between the internal high pressure fuel storage and the high pressure port area.
- the port connection channel allows a full filling of the internal fuel high pressure accumulator with fuel from the external high-pressure fuel storage.
- the throttle dampens unwanted pressure oscillations.
- Another preferred exemplary embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator runs parallel to the high-pressure passage.
- the internal high-pressure fuel accumulator and the high-pressure passage preferably extend parallel to a longitudinal axis of the fuel injector.
- a further preferred embodiment of the fuel injector is characterized in that the pressure chamber is arranged in a nozzle body, in which a nozzle needle is movable back and forth to release at least one injection hole for injecting high-pressure fuel from the pressure chamber into the combustion chamber of the internal combustion engine or to close.
- the nozzle body is part of the injector housing.
- the nozzle body may be designed as a separate part of the injector housing or integrally connected thereto.
- the movement of the nozzle needle is controlled, for example, pressure-dependent with the aid of an actuator, in particular a piezoelectric actuator.
- Another preferred exemplary embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator is arranged in the vicinity of the pressure space or an injection opening. Due to the arrangement of the internal high-pressure fuel accumulator, which is preferably close to the nozzle, it is possible to reduce a pressure drop occurring at the start of injection, which movement of a pronounced pressure wave in a high-pressure line to the external high-pressure fuel storage significantly mitigates.
- the enclosed figure shows a schematic representation of a fuel injector which is connected to an external high-pressure fuel storage.
- a fuel injector 1 is shown schematically in longitudinal section.
- the fuel injector 1 is supplied from an external fuel high-pressure accumulator 2 with fuel under high pressure. Via a feed line 3, the fuel injector 1 is connected to the external fuel high-pressure accumulator 2.
- the supply line 3 is connected to a connecting piece 5, which is provided at an injector 6.
- the injector housing 6 comprises an injector body 7 and a nozzle body 8, which If necessary, with the interposition of an intermediate body 9 is fixedly connected to the injector 7.
- the intermediate body 9 may be integrally formed with the nozzle body 8.
- the intermediate body 9 can also be a section of the nozzle body 8 which is widened in its outer diameter.
- a central guide bore (not shown) is provided for a nozzle needle, which is received in the injector 6 back and forth movable and guided in the nozzle body 8.
- the nozzle needle has a tip, on which a sealing surface is formed, which forms a sealing seat on the end 10 of the nozzle body 8 which projects into the combustion chamber, which is also referred to as the nozzle tip.
- a plurality of injection holes are provided, from which fuel, which is indicated by two drops or jets 11, 12 is injected into the combustion chamber of an internal combustion engine.
- a pressure chamber 15 is provided, which is indicated only schematically in the figure.
- a pressure shoulder is formed, which is arranged in the pressure chamber 15.
- the fuel injector 1 has, in the region of the connection piece 5, a connection region 18 which is connected to the external high-pressure fuel accumulator 2 via the supply line 3.
- the connection region 18 is connected via a connecting connection channel 20, in which a throttle 21 is provided is in communication with an internal high-pressure fuel accumulator 24.
- the internal high-pressure fuel accumulator 24 extends in the injector body 7 parallel to a high-pressure passage 26, which connects the connecting portion 18 with the pressure chamber 15.
- the connection connecting channel 20 opens in the region of the combustion chamber distal end of the internal high-pressure fuel storage 24 in this. From the end of the internal high-pressure fuel accumulator 24 close to the combustion chamber, a pressure-chamber connecting channel 30, in which a throttle 31 is provided, extends to the interface between the high-pressure passage 26 and the pressure chamber 15.
- the high pressure passage 26 is a high pressure bore having a diameter of, for example, 2mm.
- the internal fuel high pressure accumulator 24 has, for example, a volume of 4 cubic centimeters.
- the throttle 21 has, for example, a diameter of 0.5 mm.
- the throttle 31 has, for example, a diameter of 0.7 mm.
- the internal high-pressure fuel accumulator 24 which is also referred to as an internal rail, serves as a close to the injection nozzle pressure accumulator to increase the injection pressure.
- the internal high-pressure fuel accumulator 24 absorbs the pressure surges caused by injection start and end. This reduces the pressure oscillation in the injector and the nozzle needle seat wear associated therewith. Due to its near-nozzle position, the internal high-pressure fuel storage 24 reduces the nozzle pressure reduction at the start of injection, which significantly reduces the excitation of a pronounced pressure wave in the high-pressure line 3 to the external high-pressure fuel storage 2.
Landscapes
- 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
Beschreibungdescription
Titeltitle
Kraftstoffinj ektorFuel injector
Die Erfindung betrifft einen Kraftstoffinjektor gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injector according to the preamble of claim 1.
Stand der TechnikState of the art
Kraftstoffinj ektoren zur Dieseleinspritzung sind über eine Hochdruckleitung an einen externen Kraft- stoffhochdruckspeicher angeschlossen, der auch als Common-Rail bezeichnet wird. Die Verbindungsleitungen zwischen dem externen Kraftstoffhochdruckspeicher und den Kraftstoffinjektoren führen zu einem Druckverlust .Fuel injectors for diesel injection are connected via a high-pressure line to an external high-pressure fuel accumulator, which is also referred to as a common rail. The connecting lines between the external fuel high pressure accumulator and the fuel injectors lead to a pressure loss.
Offenbarung der ErfindungDisclosure of the invention
Aufgabe der Erfindung ist es, einen Kraftstoffinjektor gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, der höhere Einspritzdrücke ermöglicht als herkömmliche Kraftstoffinj ektoren . Die Aufgabe ist bei einem Kraftstoffinjektor mit einem Injektorgehäuse, das einen Druckraum umfasst, aus dem mit Hochdruck beaufschlagter Kraftstoff in einen Brennraum einer Brennkraftmaschine einge- spritzt wird und der über einen Hochdruckkanal mit einem Hochdruckanschlussbereich in Verbindung steht, der an einen externen Kraftstoffhochdruckspeicher angeschlossen ist, dadurch gelöst, dass ein interner Kraftstoffhochdruckspeicher in dem In- jektorgehäuse parallel zu dem Hochdruckkanal angeordnet und/oder geschaltet ist. Durch die hydraulische Parallelschaltung des internen Kraftstoffhochdruckspeichers zu dem Hochdruckkanal können im Betrieb des Kraftstoffinjektors auftretende Druckstö- ße besser gedämpft oder absorbiert werden als bei einer Reihenschaltung. Durch die erfindungsgemäße Parallelschaltung können Druckschwingungen im Kraftstoffinjektor und der dadurch hervorgerufene Verschleiß, zum Beispiel an einem Düsennadelsitz, deutlich reduziert werden. Darüber hinaus kann auf in Reihe geschaltete Drosseln verzichtet werden, die zu einem Druckverlust führen.The object of the invention is to provide a fuel injector according to the preamble of claim 1, which allows higher injection pressures than conventional fuel injectors. The object is with a fuel injector with an injector housing which comprises a pressure chamber from which high-pressure fuel is injected into a combustion chamber of an internal combustion engine and which is connected via a high-pressure passage to a high-pressure connection region which is connected to an external high-pressure fuel accumulator, achieved in that an internal fuel high-pressure accumulator is arranged in the injector housing parallel to the high-pressure passage and / or connected. Due to the hydraulic parallel connection of the internal high-pressure fuel accumulator to the high-pressure passage, pressure surges occurring during operation of the fuel injector can be better damped or absorbed than in the case of a series connection. By means of the parallel connection according to the invention, pressure oscillations in the fuel injector and the wear caused thereby, for example on a nozzle needle seat, can be significantly reduced. In addition, can be dispensed with in series reactors, which lead to a pressure drop.
Ein bevorzugtes Ausführungsbeispiel des Kraftstof- finjektors ist dadurch gekennzeichnet, dass der interne Kraftstoffhochdruckspeicher ein Volumen von mehr als 2 Kubikzentimeter aufweist. Die Größe des Volumens des internen Kraftstoffhochdruckspeichers hängt unter anderem vom Düsendurchfluss, von der Einspritzmenge und dem zur Verfügung stehenden Bauraum ab.A preferred embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator has a volume of more than 2 cubic centimeters. The size of the volume of the internal high-pressure fuel storage depends, among other things, on the nozzle flow rate, the injection quantity and the available installation space.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass der interne Kraftstoffhochdruckspeicher über einen Druckraumverbindungskanal mit dem Druckraum und/oder dem Hochdruckkanal verbunden ist. Der Druckraumverbindungskanal schafft eine direkte Ver- bindung zwischen dem internen Kraftstoffhochdruckspeicher und dem Hochdruckkanal und/oder dem Druckraum.A further preferred embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator is connected to the pressure space and / or the high-pressure passage via a pressure-space connecting passage. The pressure chamber connection channel creates a direct connection between the internal high-pressure fuel accumulator and the high-pressure channel and / or the pressure chamber.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass der Druckraumverbindungskanal eine Drossel aufweist. Durch die Drossel werden Druckstöße, die durch Spritzbeginn und Spritzende hervorgerufen werden können, absorbiert und/oder gedämpft. Durch die Drosselung wird Druckenergie an der Drossel dissipiert .A further preferred embodiment of the fuel injector is characterized in that the pressure chamber connecting passage has a throttle. The throttle absorbs and / or dampens pressure surges that can be caused by the start of injection and the end of injection. By throttling pressure energy is dissipated at the throttle.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinj ektors ist dadurch gekennzeichnet, dass der interne Kraftstoffhochdruckspeicher über einen Anschlussverbindungskanal mit dem Hochdruckanschlussbereich verbunden ist. Der Anschlussverbindungskanal schafft eine direkte Verbindung zwischen dem internen Kraftstoffhochdruckspeicher und dem Hochdruckanschlussbereich. Der Anschlussverbindungskanal ermöglicht eine vollständige Befüllung des internen Kraftstoffhochdruckspeichers mit Kraftstoff aus dem externen Kraftstoffhochdruckspeicher .Another preferred exemplary embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator is connected to the high-pressure connection region via a connection connecting duct. The port connection channel provides a direct connection between the internal high pressure fuel storage and the high pressure port area. The port connection channel allows a full filling of the internal fuel high pressure accumulator with fuel from the external high-pressure fuel storage.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass der Anschlussverbindungskanal eine Drossel - A -A further preferred embodiment of the fuel injector is characterized in that the connection connecting passage is a throttle - A -
aufweist. Durch die Drossel werden unerwünschte Druckschwingungen gedämpft.having. The throttle dampens unwanted pressure oscillations.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinj ektors ist dadurch gekennzeichnet, dass der interne Kraftstoffhochdruckspeicher parallel zu dem Hochdruckkanal verläuft. Der interne Kraftstoffhochdruckspeicher und der Hochdruckkanal erstrecken sich vorzugsweise parallel zu einer Längsachse des Kraftstoffinjektors .Another preferred exemplary embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator runs parallel to the high-pressure passage. The internal high-pressure fuel accumulator and the high-pressure passage preferably extend parallel to a longitudinal axis of the fuel injector.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinj ektors ist dadurch gekennzeichnet, dass der Druckraum in einem Düsenkörper angeordnet ist, in dem eine Düsennadel hin und her bewegbar ist, um mindestens ein Spritzloch zum Einspritzen von mit Hochdruck beaufschlagtem Kraftstoff aus dem Druckraum in den Brennraum der Brennkraftmaschine freizugeben oder zu verschließen. Der Düsenkörper ist Teil des Injektorgehäuses. Der Düsenkörper kann als separates Teil des Injektorgehäuses ausgeführt oder einstückig mit diesem verbunden sein. Die Bewegung der Düsennadel wird zum Beispiel druckabhängig mit Hilfe eines Aktors, insbesondere eines Pie- zoaktors, gesteuert.A further preferred embodiment of the fuel injector is characterized in that the pressure chamber is arranged in a nozzle body, in which a nozzle needle is movable back and forth to release at least one injection hole for injecting high-pressure fuel from the pressure chamber into the combustion chamber of the internal combustion engine or to close. The nozzle body is part of the injector housing. The nozzle body may be designed as a separate part of the injector housing or integrally connected thereto. The movement of the nozzle needle is controlled, for example, pressure-dependent with the aid of an actuator, in particular a piezoelectric actuator.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kraftstoffinjektors ist dadurch gekennzeichnet, dass der interne Kraftstoffhochdruckspeicher in der Nähe des Druckraums beziehungsweise einer Einspritzöffnung angeordnet ist. Durch die vorzugsweise düsennahe Anordnung des internen Kraftstoffhochdruckspeichers kann eine bei Spritzbeginn auftretende Druckabsenkung reduziert werden, was die An- regung einer ausgeprägten Druckwelle in einer Hochdruckleitung zum externen Kraftstoffhochdruckspeicher wesentlich mildert.Another preferred exemplary embodiment of the fuel injector is characterized in that the internal high-pressure fuel accumulator is arranged in the vicinity of the pressure space or an injection opening. Due to the arrangement of the internal high-pressure fuel accumulator, which is preferably close to the nozzle, it is possible to reduce a pressure drop occurring at the start of injection, which movement of a pronounced pressure wave in a high-pressure line to the external high-pressure fuel storage significantly mitigates.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein verschiedene Ausfuhrungsbeispiele im Einzelnen beschrieben sind.Further advantages, features and details of the invention will become apparent from the following description in which a different exemplary embodiments are described in detail with reference to the drawing.
Kurze Beschreibung der ZeichnungShort description of the drawing
Die beiliegende Figur zeigt eine schematische Dar- Stellung eines Kraftstoffinjektors, der an einen externen Kraftstoffhochdruckspeicher angeschlossen ist .The enclosed figure shows a schematic representation of a fuel injector which is connected to an external high-pressure fuel storage.
Beschreibung der AusfuhrungsbeispieleDescription of the exemplary embodiments
In der beiliegenden Figur ist ein Kraftstoffinjek- tor 1 schematisch im Längsschnitt dargestellt. Der Kraftstoffinjektor 1 wird aus einem externen Kraft- stoffhochdruckspeicher 2 mit unter hohem Druck stehendem Kraftstoff versorgt. Über eine Zuleitung 3 ist der Kraftstoffinjektor 1 an den externen Kraft- stoffhochdruckspeicher 2 angeschlossen.In the accompanying figure, a fuel injector 1 is shown schematically in longitudinal section. The fuel injector 1 is supplied from an external fuel high-pressure accumulator 2 with fuel under high pressure. Via a feed line 3, the fuel injector 1 is connected to the external fuel high-pressure accumulator 2.
Die Zuleitung 3 ist an einen Anschlussstutzen 5 angeschlossen, der an einem Injektorgehause 6 vorgesehen ist. Das Injektorgehause 6 umfasst einen In- jektorkorper 7 und einen Dusenkorper 8, der gegebe- nenfalls unter Zwischenschaltung eines Zwischenkörpers 9 fest mit dem Injektorkörper 7 verbunden ist.The supply line 3 is connected to a connecting piece 5, which is provided at an injector 6. The injector housing 6 comprises an injector body 7 and a nozzle body 8, which If necessary, with the interposition of an intermediate body 9 is fixedly connected to the injector 7.
Der Zwischenkörper 9 kann einstückig mit dem Düsen- körper 8 ausgebildet sein. Bei dem Zwischenkörper 9 kann es sich auch um einen im Außendurchmesser erweiterten Abschnitt des Düsenkörpers 8 handeln. In dem Düsenkörper 8 ist eine zentrale Führungsbohrung (nicht dargestellt) für eine Düsennadel vorgesehen, die in dem Injektorgehäuse 6 hin und her bewegbar aufgenommen und in dem Düsenkörper 8 geführt ist.The intermediate body 9 may be integrally formed with the nozzle body 8. The intermediate body 9 can also be a section of the nozzle body 8 which is widened in its outer diameter. In the nozzle body 8, a central guide bore (not shown) is provided for a nozzle needle, which is received in the injector 6 back and forth movable and guided in the nozzle body 8.
Die Düsennadel weist eine Spitze auf, an der eine Dichtfläche ausgebildet ist, die an dem in den Brennraum ragenden Ende 10 des Düsenkörpers 8, das auch als Düsenspitze bezeichnet wird, einen Dichtsitz bildet. An der Düsennadelspitze 10 sind mehrere Spritzlöcher vorgesehen, aus denen Kraftstoff, der durch zwei Tropfen beziehungsweise Strahlen 11, 12 angedeutet ist, in den Brennraum einer Brennkraftmaschine eingespritzt wird. In dem Düsenkörper 8 beziehungsweise dem Zwischenkörper 9 ist ein Druckraum 15 vorgesehen, der in der Figur nur schematisch angedeutet ist. An der (nicht dargestell- ten) Düsennadel ist zum Beispiel eine Druckschulter ausgebildet, die in dem Druckraum 15 angeordnet ist .The nozzle needle has a tip, on which a sealing surface is formed, which forms a sealing seat on the end 10 of the nozzle body 8 which projects into the combustion chamber, which is also referred to as the nozzle tip. At the nozzle needle tip 10 a plurality of injection holes are provided, from which fuel, which is indicated by two drops or jets 11, 12 is injected into the combustion chamber of an internal combustion engine. In the nozzle body 8 and the intermediate body 9, a pressure chamber 15 is provided, which is indicated only schematically in the figure. At the (not shown) nozzle needle, for example, a pressure shoulder is formed, which is arranged in the pressure chamber 15.
Der Kraftstoffinj ektor 1 weist im Bereich des An- schlussstutzens 5 einen Anschlussbereich 18 auf, der über die Zuleitung 3 mit dem externen Kraftstoffhochdruckspeicher 2 in Verbindung steht. Der Anschlussbereich 18 steht über einen Anschlussver- bindungskanal 20, in dem eine Drossel 21 vorgesehen ist, mit einem internen Kraftstoffhochdruckspeicher 24 in Verbindung. Der interne Kraftstoffhochdruckspeicher 24 erstreckt sich in dem Injektorkörper 7 parallel zu einem Hochdruckkanal 26, der den An- Schlussbereich 18 mit dem Druckraum 15 verbindet. Der Anschlussverbindungskanal 20 mündet im Bereich des brennraumfernen Endes des internen Kraftstoffhochdruckspeichers 24 in diesen. Von dem brennraum- nahen Ende des internen Kraftstoffhochdruckspei- chers 24 erstreckt sich ein Druckraumverbindungska- nal 30, in dem eine Drossel 31 vorgesehen ist, zu der Schnittstelle zwischen dem Hochdruckkanal 26 und dem Druckraum 15.The fuel injector 1 has, in the region of the connection piece 5, a connection region 18 which is connected to the external high-pressure fuel accumulator 2 via the supply line 3. The connection region 18 is connected via a connecting connection channel 20, in which a throttle 21 is provided is in communication with an internal high-pressure fuel accumulator 24. The internal high-pressure fuel accumulator 24 extends in the injector body 7 parallel to a high-pressure passage 26, which connects the connecting portion 18 with the pressure chamber 15. The connection connecting channel 20 opens in the region of the combustion chamber distal end of the internal high-pressure fuel storage 24 in this. From the end of the internal high-pressure fuel accumulator 24 close to the combustion chamber, a pressure-chamber connecting channel 30, in which a throttle 31 is provided, extends to the interface between the high-pressure passage 26 and the pressure chamber 15.
Bei dem Hochdruckkanal 26 handelt es sich um eine Hochdruckbohrung, die einen Durchmesser von zum Beispiel 2 mm aufweist. Der interne Kraftstoffhoch- druckspeicher 24 hat zum Beispiel ein Volumen von 4 Kubikzentimetern. Die Drossel 21 weist zum Beispiel einen Durchmesser von 0,5 mm auf. Die Drossel 31 weist zum Beispiel einen Durchmesser von 0,7 mm auf .The high pressure passage 26 is a high pressure bore having a diameter of, for example, 2mm. The internal fuel high pressure accumulator 24 has, for example, a volume of 4 cubic centimeters. The throttle 21 has, for example, a diameter of 0.5 mm. The throttle 31 has, for example, a diameter of 0.7 mm.
Der interne Kraftstoffhochdruckspeicher 24, der auch als internes Rail bezeichnet wird, dient als ein nahe an der Einspritzdüse liegender Druckspeicher zur Anhebung des Einspritzdrucks. In Kombination mit den Drosseln 21, 31 absorbiert der interne Kraftstoffhochdruckspeicher 24 die durch Spritzbe- ginn und -ende hervorgerufenen Druckstöße. Dadurch werden die Druckschwingung im Injektor und der damit verbundene Düsennadelsitzverschleiß reduziert. Aufgrund seiner düsennahen Lage reduziert der interne Kraftstoffhochdruckspeicher 24 die Düsen- druckabsenkung bei Spritzbeginn, was die Anregung einer ausgeprägten Druckwelle in der Hochdruckleitung 3 zu dem externen Kraftstoffhochdruckspeicher 2 wesentlich mildert. The internal high-pressure fuel accumulator 24, which is also referred to as an internal rail, serves as a close to the injection nozzle pressure accumulator to increase the injection pressure. In combination with the throttles 21, 31, the internal high-pressure fuel accumulator 24 absorbs the pressure surges caused by injection start and end. This reduces the pressure oscillation in the injector and the nozzle needle seat wear associated therewith. Due to its near-nozzle position, the internal high-pressure fuel storage 24 reduces the nozzle pressure reduction at the start of injection, which significantly reduces the excitation of a pronounced pressure wave in the high-pressure line 3 to the external high-pressure fuel storage 2.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006033937.1 | 2006-07-21 | ||
| DE200610033937 DE102006033937A1 (en) | 2006-07-21 | 2006-07-21 | fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008009511A1 true WO2008009511A1 (en) | 2008-01-24 |
Family
ID=38438125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2007/055437 Ceased WO2008009511A1 (en) | 2006-07-21 | 2007-06-04 | Fuel injector |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102006033937A1 (en) |
| WO (1) | WO2008009511A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012058703A1 (en) * | 2010-11-02 | 2012-05-10 | Robert Bosch Gmbh | Device for injecting fuel into the combustion chamber of an internal combustion engine |
| RU2731155C1 (en) * | 2019-07-05 | 2020-08-31 | федеральное государственное бюджетное образовательное учреждение высшего образования "Московский политехнический университет" (Московский Политех) | Electrically-hydraulic control nozzle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012204659A1 (en) * | 2012-03-22 | 2013-09-26 | Man Diesel & Turbo Se | Injector for a fuel supply system of an internal combustion engine and fuel supply system |
Citations (3)
| 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 |
| FR2862352A1 (en) * | 2003-11-14 | 2005-05-20 | Renault Sas | FUEL INJECTION DEVICE EQUIPPED WITH PRESSURE WAVE DAMPING MEANS |
-
2006
- 2006-07-21 DE DE200610033937 patent/DE102006033937A1/en not_active Withdrawn
-
2007
- 2007-06-04 WO PCT/EP2007/055437 patent/WO2008009511A1/en not_active Ceased
Patent Citations (3)
| 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 |
| FR2862352A1 (en) * | 2003-11-14 | 2005-05-20 | Renault Sas | FUEL INJECTION DEVICE EQUIPPED WITH PRESSURE WAVE DAMPING MEANS |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012058703A1 (en) * | 2010-11-02 | 2012-05-10 | Robert Bosch Gmbh | Device for injecting fuel into the combustion chamber of an internal combustion engine |
| RU2559096C2 (en) * | 2010-11-02 | 2015-08-10 | Роберт Бош Гмбх | Device for fuel injection to combustion chamber of internal combustion engine |
| US9447720B2 (en) | 2010-11-02 | 2016-09-20 | Robert Bosch Gmbh | Device for injecting fuel into the combustion chamber of an internal combustion engine |
| RU2731155C1 (en) * | 2019-07-05 | 2020-08-31 | федеральное государственное бюджетное образовательное учреждение высшего образования "Московский политехнический университет" (Московский Политех) | Electrically-hydraulic control nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006033937A1 (en) | 2008-01-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1485609B1 (en) | Device for injecting fuel to stationary internal combustion engines | |
| DE102011105351A1 (en) | Fuel system has the memory and flow restrictor | |
| DE19842067A1 (en) | Fuel injection system for diesel internal combustion engine has accumulator associated directly with each injector to eliminate fuel pressure fluctuations | |
| EP2852754B1 (en) | Injector of a fuel injection system | |
| WO2008009511A1 (en) | Fuel injector | |
| EP1936180B1 (en) | Fuel injector valve | |
| WO2009141182A1 (en) | Fuel injector | |
| WO2008049665A1 (en) | Fuel injection valve device | |
| DE10057683B4 (en) | Fuel injection system | |
| WO2008058799A1 (en) | Fuel injector | |
| DE102008041167A1 (en) | Fuel injector for storage-type injector systems for injecting pressurized fuel into combustion chamber of internal combustion engine, has injector housing, which comprises internal high-pressure volume for injecting highly pressurized fuel | |
| DE102006015745A1 (en) | Fuel injector especially for diesel engine has a solenoid operated valve with a bypass for enhanced switching speed | |
| EP1751423B1 (en) | Fuel-injection system | |
| DE102006047294A1 (en) | Fuel supply installation, particularly common-rail fuel supply installation of internal combustion engine, particularly ship diesel internal combustion engine, has low pressure area and pumping unit with high pressure pump | |
| DE10015740C2 (en) | Injection valve for injecting fuel into an internal combustion engine | |
| EP2271836B1 (en) | Fuel injection system having an unrestricted fuel supply to the injectors | |
| EP1979605A1 (en) | Fuel injector | |
| DE102007001365A1 (en) | Common rail injector, for injecting e.g. petrol, into combustion chamber of internal combustion engine, has switching chamber connected with low pressure area by connecting channel that is closed and opened by control valve | |
| EP2721282B1 (en) | Method of manufacturing of an injector, in particular of an fuel injector for an internal combustion engine | |
| WO2005031154A1 (en) | Structural component of a fuel injection device for an internal combustion engine and corresponding fuel injection device | |
| DE102008012637A1 (en) | 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 | |
| DE10326257A1 (en) | Fluid control valve for control module of IC engine fuel injection valve has valve closure operated via piezoelectric actuator cooperating with 2 valve seats either side of intermediate position defined by stroke stop | |
| EP2047095A1 (en) | Fuel injector | |
| WO2008055723A1 (en) | Fuel injection device | |
| DE102004007342A1 (en) | Hydraulic system for an internal combustion engine's fuel injection system has a source for a fluid under high pressure linked to a valve with control and nozzle devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07729825 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: RU |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 07729825 Country of ref document: EP Kind code of ref document: A1 |