EP2052149A1 - Apparatus for injecting fuel into the combustion chamber of an internal combustion engine - Google Patents

Apparatus for injecting fuel into the combustion chamber of an internal combustion engine

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Publication number
EP2052149A1
EP2052149A1 EP07784620A EP07784620A EP2052149A1 EP 2052149 A1 EP2052149 A1 EP 2052149A1 EP 07784620 A EP07784620 A EP 07784620A EP 07784620 A EP07784620 A EP 07784620A EP 2052149 A1 EP2052149 A1 EP 2052149A1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
injector
bore
supply
tube
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
EP07784620A
Other languages
German (de)
French (fr)
Other versions
EP2052149B1 (en
Inventor
Johannes Schnedt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2052149A1 publication Critical patent/EP2052149A1/en
Application granted granted Critical
Publication of EP2052149B1 publication Critical patent/EP2052149B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention relates to a device for injecting fuel into the combustion chamber of an internal combustion engine with an injector defined in a cylinder head and a plurality of inlet and outlet lines extending through the cylinder head for supplying the injector with media, in particular fuel, coolant and / or lubricant.
  • Such a device can be found for example in JP 5195906 A.
  • an electronically controlled injector for injecting fuel into the combustion chamber is usually located in the cylinder head.
  • This injector must be supplied with various media such as high pressure fuel, lubricating oil or coolant. Furthermore, leakage quantities occurring must again be led out of the cylinder, as well as the resulting return of lubricating oil or coolant.
  • the various supply and discharge lines to and from the injector must pass through corresponding holes in the cylinder head, with an inlet and possibly a drain hole in the cylinder head being normally provided for each medium have to be. Due to the existing water channels for cooling the Zylinderblo ⁇ kes, however, it is often difficult to provide the necessary holes for the media transport available.
  • the present invention therefore aims to reduce the number of bores in the cylinder head necessary for the transport of media while at the same time minimizing the expense of manufacturing and assembling the injector and to connect the various supply and discharge lines to the injector simplify. Furthermore, the reliability should be increased.
  • the injection device is designed such that the supply and discharge lines are guided through a common bore of the cylinder head, wherein at least two supply and discharge lines are formed by concentric tubes.
  • the conversion of engines with conventional injection systems on a common-rail injection system is facilitated because the cylinder head does not need to be manipulated and no additional holes must be introduced.
  • a single bore for receiving a variety of inlets and outlets, so that usually eliminates the need for further drilling in the cylinder head.
  • at least two inlets and outlets are formed by concentric tubes.
  • Another channel for the supply and discharge of media is provided in accordance with a preferred embodiment, characterized in that the cladding tube at a distance from the inner wall of the bore of the Cylinder head is arranged.
  • a further annular channel is formed between the outer wall of the cladding tube and the inner wall of the bore provided in the cylinder head.
  • a further increase in the number of flow channels preferably succeeds in that the annular space between the central tube and the cladding tube is divided to form at least two supply and discharge lines in the circumferential direction. This results in two part-annular channels, wherein additional channels for the transport of media to or from the injector can be created within the annular space by arranging further partitions.
  • the central tube is preferably designed as a high-pressure line for the supply of high-pressure fuel to the injector.
  • the central pipe is the only one to have a circular flow cross-section, so that connection to high-pressure fuel-carrying supply lines or connection to the injector is made considerably easier.
  • the central arrangement of the high-pressure line has the advantage that, in the event of a break in the high-pressure line, the cylinder head is not necessarily flooded immediately, since even after such a break further concentric tubes remain which can guide the high-pressure medium accordingly.
  • a particularly safe and compact design results according to a preferred embodiment in that the central tube with the cladding tube forms a lance whose conical end can be pressed against a conical seat of a lance receiving bore of the injector.
  • the conical design of the lance end makes it possible to produce a particularly tight connection of the central tube and in particular the central high-pressure line to the injector.
  • the lance in the free space between the high-pressure line and the concentrically arranged cladding tube has an additional channel, which further transporting Media is used, this annular channel preferably opens into an annular stitch in the lance receiving bore of the injector, so that at the same time a tight connection of the central high-pressure line and the high-pressure line annularly surrounding channel succeeds when inserting the lance into the lance receiving bore.
  • a particularly compact design results according to a preferred embodiment in that the bore of the cylinder head extends transversely to the nozzle axis.
  • Fig. 1 shows schematically the media supply of a Einspritzinjektors according to the prior art
  • Fig. 2 and 3 shows the inventive design of the media supply.
  • Fig. 1 shows schematically the media supply of a Einspritzinjektors 1.
  • the injector 1 In the cylinder head 2 to a plurality of holes 3, 4 and 5 are attached. With the help of a high pressure line 6, which is guided in the low pressure return bore 4, the injector 1 is supplied under high pressure fuel. The amount of fuel necessary for controlling the injection is conveyed back into the fuel tank (not shown) via the low-pressure return bore 4.
  • the injection injector 1 can be additionally supplied with lubricant or coolant.
  • the lubricant / coolant return takes place via a return bore 5 in a lubricant / coolant tank, not shown.
  • the individual media are separated by means of sealing elements 7, which may be formed for example as O-rings.
  • Fig. 2 shows the erfindungsunpliliche training of the media supply.
  • the injector 1 is supplied here by a single connection hole 8 in the cylinder head 2 f in which a lance 9 is installed.
  • the lance 9 is fixed in a lance receiving bore 16 of the injector 1 and to a bore 23 connected.
  • the lance consists here of a high-pressure line 11 and a coaxially arranged jacket tube 10 whose outer diameter is smaller than the inner diameter of the connection bore 8. This results in a plurality of coaxially arranged annular spaces 12, 13, 14 and 15, in which the required media can be performed , In the central high-pressure bore 12, high-pressure fuel is supplied to the injection injector 1.
  • the part of the fuel required for the control of the injection injector 1 is returned to the fuel tank, not shown, via the low-pressure return line 14 located between the connection bore 8 and the jacket tube 10.
  • the low-pressure return line 14 located between the connection bore 8 and the jacket tube 10.
  • the media are sealed against each other by means of sealing elements 19 and 20.
  • the seal 19 defines an annular space 25 from which leads away a schematically indicated line 21. Through the seal 20, a sealing of the annular space created by an annular space 22, wherein a line 24 leads away from this annular space 22.
  • Fig. 3 is a section along the line III-III of Fig. 2 is shown enlarged, wherein the partitions 17 and 18 can be seen, which divides the annular space between the cladding tube 10 and the high pressure line 11 into the channels 13 and 15.

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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

In an apparatus for injecting fuel into the combustion chamber of an internal combustion engine having an injector (1) which is fixed in a cylinder head (2) and a plurality of feed lines and discharge lines which extend through the cylinder head (2) for supplying the injector (1) with media, in particular fuel, cooling fluid and/or lubricant, the feed lines and discharge lines are guided through a common hole (8) of the cylinder head (2), and at least two feed lines and discharge lines are formed by concentric pipes (10, 11).

Description

Vorrichtung zum Einspritzen von Kraftstoff in den Brennraum einer BrennkraftmaschineDevice for injecting fuel into the combustion chamber of an internal combustion engine
Die Erfindung betrifft eine Vorrichtung zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einem in einem Zylinderkopf festgelegten Injektor und einer Mehrzahl von durch den Zylinderkopf verlaufenden Zu- und Ableitungen für die Versorgung des Injektor mit Medien, insbesondere Kraftstoff, Kühlflüssigkeit und/oder Schmiermittel.The invention relates to a device for injecting fuel into the combustion chamber of an internal combustion engine with an injector defined in a cylinder head and a plurality of inlet and outlet lines extending through the cylinder head for supplying the injector with media, in particular fuel, coolant and / or lubricant.
Eine derartige Vorrichtung ist beispielsweise der JP 5195906 A zu entnehmen.Such a device can be found for example in JP 5195906 A.
In einer Brennkraftmaschine, insbesondere einem Dieselmotor mit Common-Rail-Einspritzsystem, befindet sich üblicherweise im Zylinderkopf ein elektronisch gesteuerter Injektor zur Einspritzung von Kraftstoff in den Brennraum. Dieser Injektor muss mit verschiedenen Medien, beispielsweise mit Hochdruck- kraftstoff, Schmieröl oder Kühlmittel versorgt werden. Weiters müssen auftretende Leckagemengen wieder aus dem Zylinder heraus geführt werden, ebenso wie der anfallende Rücklauf von Schmieröl bzw. Kühlmittel. Wenn der Injektor nicht von außerhalb des Zylinderkopfes frei zugänglich ist, müssen die verschiedenen Zu- bzw. Ableitung zum bzw. vom Injektor durch entsprechende Bohrungen im Zylinderkopf verlaufen, wobei normalerweise für jedes Medium eine Zu- und ggf. eine Ablauf- bohrung im Zylinderkopf vorgesehen sein muss. Aufgrund der vorhandenen Wasserkanäle zur Kühlung des Zylinderbloσkes ist es jedoch oft schwierig die nötigen Bohrungen für den Medien- transport zur Verfügung zu stellen.In an internal combustion engine, in particular a diesel engine with a common-rail injection system, an electronically controlled injector for injecting fuel into the combustion chamber is usually located in the cylinder head. This injector must be supplied with various media such as high pressure fuel, lubricating oil or coolant. Furthermore, leakage quantities occurring must again be led out of the cylinder, as well as the resulting return of lubricating oil or coolant. If the injector is not freely accessible from outside the cylinder head, the various supply and discharge lines to and from the injector must pass through corresponding holes in the cylinder head, with an inlet and possibly a drain hole in the cylinder head being normally provided for each medium have to be. Due to the existing water channels for cooling the Zylinderbloσkes, however, it is often difficult to provide the necessary holes for the media transport available.
Die vorliegende Erfindung zielt daher darauf ab, die für den Medientransport notwendige Bohrungsanzahl im Zylinderkopf zu reduzieren sowie gleichzeitig den Aufwand für die Fertigung und die Montage des Injektors zu minimieren und den Anschluss der verschiedenen Zu- bzw. Ablaufleitungen an den Injektor zu vereinfachen. Weiters soll die Betriebssicherheit erhöht werden.The present invention therefore aims to reduce the number of bores in the cylinder head necessary for the transport of media while at the same time minimizing the expense of manufacturing and assembling the injector and to connect the various supply and discharge lines to the injector simplify. Furthermore, the reliability should be increased.
Zur Lösung dieser Aufgabe ist die Einspritzvorrichtung erfindungsgemäß derart ausgebildet, dass die Zu- und Ableitungen durch eine gemeinsame Bohrung des Zylinderkopfes geführt sind, wobei wenigstens zwei Zu- bzw. Ableitungen von konzentrischen Rohren gebildet sind. Dadurch, dass die Zu- und Ableitungen durch eine gemeinsame Bohrung des Zylinderkopfes geführt sind, kann die Anzahl an Bohrungen im Zylinderkopf und damit der Aufwand bei der Konstruktion und der Fertigung durch den Wegfall von komplizierten Bohrungsführungen reduziert werden. Darüber hinaus wird die Umrüstung von Motoren mit konventionellen Einspritzsystemen auf ein Common-Rail-Einspritz- System erleichtert, da der Zylinderkopf nicht manipuliert werden muss und keine zusätzlichen Bohrungen eingebracht werden müssen.To solve this problem, the injection device according to the invention is designed such that the supply and discharge lines are guided through a common bore of the cylinder head, wherein at least two supply and discharge lines are formed by concentric tubes. The fact that the supply and discharge lines are guided through a common bore of the cylinder head, the number of holes in the cylinder head and thus the cost of construction and manufacturing can be reduced by the elimination of complicated bore guides. In addition, the conversion of engines with conventional injection systems on a common-rail injection system is facilitated because the cylinder head does not need to be manipulated and no additional holes must be introduced.
Es ist erfindungsgemäß eine einzige Bohrung für die Aufnahme einer Vielzahl von Zu- bzw. Ableitungen vorgesehen, sodass in der Regel die Notwendigkeit weiterer Bohrungen im Zylinderkopf entfällt. Um den Querschnitt der gemeinsamen Bohrung optimal ausnützen zu können, ist hierbei vorgesehen, dass wenigstens zwei Zu- bzw. Ableitungen von konzentrischen Rohren gebildet sind. Durch eine derartige Ausbildung ist eine Platz sparende Anordnung der einzelnen Zu- bzw. Ableitungen sichergestellt, wobei gemäß einer bevorzugten Weiterbildung in der Bohrung des Zylinderkopfes ein zentrales Rohr angeordnet ist, welches von einem konzentrischen Hüllrohr mit Abstand umgeben ist. Dabei kann ein erstes Medium innerhalb des zentralen Rohres und ein weiteres Medium in dem zwischen der Außenwand des zentralen Rohres und der Innenwand des konzentrischen Hüllrohres entstehenden Ringkanal geführt werden.It is inventively provided a single bore for receiving a variety of inlets and outlets, so that usually eliminates the need for further drilling in the cylinder head. In order to make optimum use of the cross section of the common bore, it is provided here that at least two inlets and outlets are formed by concentric tubes. By such a design, a space-saving arrangement of the individual supply and discharge lines is ensured, according to a preferred embodiment in the bore of the cylinder head, a central tube is arranged, which is surrounded by a concentric cladding tube at a distance. In this case, a first medium can be guided within the central tube and another medium in the resulting between the outer wall of the central tube and the inner wall of the concentric jacket tube annular channel.
Ein weiterer Kanal zur Zu- bzw. Ableitung von Medien ist gemäß einer bevorzugten Weiterbildung dadurch vorgesehen, dass das Hüllrohr in Abstand von der Innenwand der Bohrung des Zylinderkopfes angeordnet ist. Dabei entsteht ein weiterer Ringkanal zwischen dem der Außenwand des Hüllrohres und der Innenwand der im Zylinderkopf vorgesehenen Bohrung.Another channel for the supply and discharge of media is provided in accordance with a preferred embodiment, characterized in that the cladding tube at a distance from the inner wall of the bore of the Cylinder head is arranged. In this case, a further annular channel is formed between the outer wall of the cladding tube and the inner wall of the bore provided in the cylinder head.
Eine weitere Erhöhung der Anzahl der Durchflusskanäle gelingt bevorzugt dadurch, dass der ringförmige Raum zwischen dem zentralen Rohr und dem Hüllrohr zur Ausbildung von wenigstens zwei Zu- bzw. Ableitungen in Umfangsrichtung geteilt ist. Dabei entstehen zwei teilringförmige Kanäle, wobei innerhalb des Ringraumes durch Anordnung weiterer Trennwände noch zusätzlich Kanäle für den Transport von Medien zu bzw. vom Injektor geschaffen werden können.A further increase in the number of flow channels preferably succeeds in that the annular space between the central tube and the cladding tube is divided to form at least two supply and discharge lines in the circumferential direction. This results in two part-annular channels, wherein additional channels for the transport of media to or from the injector can be created within the annular space by arranging further partitions.
Das zentrale Rohr ist bevorzugt als Hochdruckleitung für die Zufuhr von Hochdruckkraftstoff zum Injektor ausgebildet. Im Gegensatz zu den übrigen Kanälen bzw. Leitungen weist das zentrale Rohr als einziges einen kreisförmigen Durchflussquerschnitt auf, sodass der Anschluss an Hochdruckkraftstoff führende Zuleitungen bzw. der Anschluss an den Injektor wesentlich erleichtert wird. Des weiteren hat die zentrale Anordnung der Hochdruckleitung den Vorteil, dass bei einem Bruch der Hochdruckleitung nicht notwendigerweise sofort der Zylinderkopf geflutet wird, da auch nach einem derartigen Bruch weitere konzentrische Rohre verbleiben, welche das Hoch- druckmedium entsprechend führen können.The central tube is preferably designed as a high-pressure line for the supply of high-pressure fuel to the injector. In contrast to the other channels or lines, the central pipe is the only one to have a circular flow cross-section, so that connection to high-pressure fuel-carrying supply lines or connection to the injector is made considerably easier. Furthermore, the central arrangement of the high-pressure line has the advantage that, in the event of a break in the high-pressure line, the cylinder head is not necessarily flooded immediately, since even after such a break further concentric tubes remain which can guide the high-pressure medium accordingly.
Eine besonders sichere und kompakte Ausbildung ergibt sich gemäß einer bevorzugten Ausführungsform dadurch, dass das zentrale Rohr mit dem Hüllrohr eine Lanze ausbildet, deren konisches Ende gegen einen konischen Sitz einer Lanzenaufnahmebohrung des Injektors pressbar ist. Durch die konische Ausführung des Lanzenendes lässt sich ein besonders dichter Anschluss des zentralen Rohres und insbesondere der zentralen Hochdruckleitung an den Injektor herstellen. Neben der Hoch- druckleitung weist die Lanze im freien Raum zwischen der Hochdruckleitung und dem konzentrisch angeordnetem Hüllrohr einen zusätzlichen Kanal auf, welcher dem Transport weiterer Medien dient, wobei dieser ringförmige Kanal bevorzugt in einen Ringstich in der Lanzenaufnahmebohrung des Injektors mündet, sodass beim Einsetzen der Lanze in die Lanzenaufnahmebohrung gleichzeitig ein dichter Anschluss der zentralen Hochdruck- leitung und des die Hochdruckleitung ringförmig umgebenden Kanals gelingt.A particularly safe and compact design results according to a preferred embodiment in that the central tube with the cladding tube forms a lance whose conical end can be pressed against a conical seat of a lance receiving bore of the injector. The conical design of the lance end makes it possible to produce a particularly tight connection of the central tube and in particular the central high-pressure line to the injector. In addition to the high-pressure line, the lance in the free space between the high-pressure line and the concentrically arranged cladding tube has an additional channel, which further transporting Media is used, this annular channel preferably opens into an annular stitch in the lance receiving bore of the injector, so that at the same time a tight connection of the central high-pressure line and the high-pressure line annularly surrounding channel succeeds when inserting the lance into the lance receiving bore.
Eine besonders kompakte Ausbildung ergibt sich gemäß einer bevorzugten Ausbildung dadurch, dass die Bohrung des Zylinder- köpfes quer zur Düsenachse verläuft.A particularly compact design results according to a preferred embodiment in that the bore of the cylinder head extends transversely to the nozzle axis.
Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert, wobei Fig. 1 schematisch die Medienversorgung eines Einspritzinjektors nach dem Stand der Technik und Fig. 2 und 3 die erfindungsgemäße Ausbildung der Medienzuführung zeigt.The invention is explained in more detail below with reference to an embodiment schematically illustrated in the drawing, wherein Fig. 1 shows schematically the media supply of a Einspritzinjektors according to the prior art and Fig. 2 and 3 shows the inventive design of the media supply.
Fig. 1 zeigt schematisch die Medienversorgung eines Einspritzinjektors 1. Im Zylinderkopf 2 sind dazu mehrere Bohrungen 3, 4 und 5 angebracht. Mit Hilfe einer Hochdruckleitung 6, die in der Niederdruck-Rücklaufbohrung 4 geführt ist, wird dem Injektor 1 unter Hochdruck stehender Kraftstoff zugeführt. Die zur Steuerung der Einspritzung notwendige Kraftstoffmenge wird über die Niederdruck-Rücklaufbohrung 4 zurück in den Kraft- stofftank (nicht dargestellt) gefördert. Über eine Zulauf- bohrung 3 kann der Einspritzinjektor 1 zusätzlich mit Schmieroder Kühlmittel versorgt werden. Der Schmier-/Kühlmittel- rücklauf erfolgt über eine Rücklaufbohrung 5 in einen nicht dargestellten Schmier-/Kühlmitteltank. Die einzelnen Medien werden mit Hilfe von Dichtelementen 7, die beispielsweise als O-Ringe ausgebildet sein können, von einander getrennt.Fig. 1 shows schematically the media supply of a Einspritzinjektors 1. In the cylinder head 2 to a plurality of holes 3, 4 and 5 are attached. With the help of a high pressure line 6, which is guided in the low pressure return bore 4, the injector 1 is supplied under high pressure fuel. The amount of fuel necessary for controlling the injection is conveyed back into the fuel tank (not shown) via the low-pressure return bore 4. Via an inlet bore 3, the injection injector 1 can be additionally supplied with lubricant or coolant. The lubricant / coolant return takes place via a return bore 5 in a lubricant / coolant tank, not shown. The individual media are separated by means of sealing elements 7, which may be formed for example as O-rings.
Fig. 2 zeigt die erfindungsgegenständliche Ausbildung der Medienzuführung. Der Injektor 1 wird hier durch eine einzelne Anschlussbohrung 8 im Zylinderkopf 2f in die eine Lanze 9 eingebaut ist, versorgt. Die Lanze 9 ist in einer Lanzenaufnahmebohrung 16 des Injektors 1 fixiert und an eine Bohrung 23 angeschlossen. Die Lanze besteht hierbei aus einer Hochdruckleitung 11 und einem koaxial dazu angeordneten Hüllrohr 10, dessen Außendurchmesser geringer ist als der Innendurchmesser der Anschlussbohrung 8. Dadurch ergeben sich mehrere koaxial angeordnete Ringräume 12, 13, 14 und 15, in denen die erforderlichen Medien geführt werden können. In der zentralen Hochdruckbohrung 12 wird unter Hochdruck befindlicher Kraftstoff dem Einspritzinjektor 1 zugeführt. Der für die Steuerung des Einspritzinjektors 1 notwendige Teil des Kraft- Stoffes wird über den zwischen Anschlussbohrung 8 und Hüllrohr 10 befindlichen Niederdruck-Rücklauf 14 in den nicht dargestellten Kraftstofftank zurückgeführt. Zwischen Hüllrohr 10 und Hochdruckleitung 11 sind zwei in Umfangsrichtung getrennte Bereiche realisiert, die als Schmier-/Kühlmittelzulauf 13 bzw. Schmier-/Kühlmittelablauf 15 verwendet werden. Die Medien sind gegeneinander mit Hilfe von Dichtelementen 19 und 20 abgedichtet. Die Dichtung 19 grenzt eine Ringraum 25 ab, von dem eine schematisch angedeutete Leitung 21 wegführt. Durch die Dichtung 20 erfolgt eine Abdichtung des durch einen Ringstich geschaffenen Ringraums 22, wobei eine Leitung 24 von diesem Ringraum 22 wegführt.Fig. 2 shows the erfindungsunständliche training of the media supply. The injector 1 is supplied here by a single connection hole 8 in the cylinder head 2 f in which a lance 9 is installed. The lance 9 is fixed in a lance receiving bore 16 of the injector 1 and to a bore 23 connected. The lance consists here of a high-pressure line 11 and a coaxially arranged jacket tube 10 whose outer diameter is smaller than the inner diameter of the connection bore 8. This results in a plurality of coaxially arranged annular spaces 12, 13, 14 and 15, in which the required media can be performed , In the central high-pressure bore 12, high-pressure fuel is supplied to the injection injector 1. The part of the fuel required for the control of the injection injector 1 is returned to the fuel tank, not shown, via the low-pressure return line 14 located between the connection bore 8 and the jacket tube 10. Between the cladding tube 10 and the high-pressure line 11, two regions separated in the circumferential direction are realized, which are used as the lubricant / coolant inlet 13 or the lubricant / coolant outlet 15. The media are sealed against each other by means of sealing elements 19 and 20. The seal 19 defines an annular space 25 from which leads away a schematically indicated line 21. Through the seal 20, a sealing of the annular space created by an annular space 22, wherein a line 24 leads away from this annular space 22.
In Fig. 3 ist ein Schnitt nach der Linie III-III der Fig. 2 vergrößert dargestellt, wobei die Trennwände 17 und 18 ersichtlich sind, die den Ringraum zwischen Hüllrohr 10 und Hochdruckleitung 11 in die Kanäle 13 und 15 aufteilt. In Fig. 3 is a section along the line III-III of Fig. 2 is shown enlarged, wherein the partitions 17 and 18 can be seen, which divides the annular space between the cladding tube 10 and the high pressure line 11 into the channels 13 and 15.

Claims

Patentansprüche : Claims:
1. Vorrichtung zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einem in einem Zylinderkopf festgelegten Injektor und einer Mehrzahl von durch den Zylinderkopf verlaufenden Zu- und Ableitungen für die Versorgung des Injektors mit Medien, insbesondere Kraftstoff, Kühlflüssigkeit und/oder Schmiermittel, dadurch gekennzeichnet, dass die Zu- und Ableitungen durch eine gemeinsame Bohrung (8) des Zylinderkopfes (2) geführt sind, wobei wenigstens zwei Zu- bzw. Ableitungen von konzentrischen Rohren (10,11) gebildet sind.1. A device for injecting fuel into the combustion chamber of an internal combustion engine having a specified in a cylinder head injector and a plurality of extending through the cylinder head supply and discharge lines for supplying the injector with media, in particular fuel, coolant and / or lubricant, characterized in that the supply and discharge lines are guided through a common bore (8) of the cylinder head (2), at least two inlets and outlets being formed by concentric tubes (10, 11).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass in der Bohrung (8) des Zylinderkopfes (2) ein zentrales Rohr (11) angeordnet ist, welches von einem konzentrischen Hüllrohr (10) mit Abstand umgeben ist.2. Apparatus according to claim 1, characterized in that in the bore (8) of the cylinder head (2), a central tube (11) is arranged, which is surrounded by a concentric jacket tube (10) at a distance.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Hüllrohr (10) in Abstand von der Innenwand der Bohrung (8) des Zylinderkopfes (2) angeordnet ist.3. A device according to claim 2, characterized in that the cladding tube (10) at a distance from the inner wall of the bore (8) of the cylinder head (2) is arranged.
4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der ringförmige Raum zwischen dem zentralen Rohr (11) und dem Hüllrohr (10) zur Ausbildung von wenigstens zwei Zu- bzw. Ableitungen (13,15) in Umfangsrichtung geteilt ist.4. Apparatus according to claim 2 or 3, characterized in that the annular space between the central tube (11) and the cladding tube (10) for the formation of at least two supply and discharge lines (13,15) is divided in the circumferential direction.
5. Vorrichtung nach Anspruch 2 , 3 oder 4 , dadurch gekennzeichnet, dass das zentrale Rohr (11) als Hochdruckleitung für die Zufuhr von Hochdruckkraftstoff zum Injektor (1) ausgebildet ist.5. Apparatus according to claim 2, 3 or 4, characterized in that the central tube (11) is designed as a high-pressure line for the supply of high-pressure fuel to the injector (1).
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Bohrung (8) des Zylinderkopfes (2) quer zur Düsenachse verläuft. 6. Device according to one of claims 1 to 5, characterized in that the bore (8) of the cylinder head (2) extends transversely to the nozzle axis.
7. Vorrichtung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass das zentrale Rohr (11) mit dem Hüllrohr (10) eine Lanze ausbildet, deren konisches Ende gegen einen konischen Sitz einer Lanzenaufnahmebohrung (16) des Injektors (1) pressbar ist.7. Device according to one of claims 2 to 6, characterized in that the central tube (11) with the cladding tube (10) forms a lance whose conical end against a conical seat of a Lanzenaufnahmebohrung (16) of the injector (1) can be pressed ,
8. Vorrichtung nach einem der Ansprüche 4 bis 7 , dadurch gekennzeichnet, dass der ringförmige Raum in einen Ringstich in der Lanzenaufnahmebohrung (16) des Injektors (1) mündet. 8. Device according to one of claims 4 to 7, characterized in that the annular space in an annular stitch in the lance receiving bore (16) of the injector (1) opens.
EP07784620.2A 2006-08-17 2007-08-16 Apparatus for injecting fuel into the combustion chamber of an internal combustion engine Active EP2052149B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT13832006 2006-08-17
PCT/AT2007/000391 WO2008019415A1 (en) 2006-08-17 2007-08-16 Apparatus for injecting fuel into the combustion chamber of an internal combustion engine

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EP2052149A1 true EP2052149A1 (en) 2009-04-29
EP2052149B1 EP2052149B1 (en) 2016-01-13

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Publication number Priority date Publication date Assignee Title
US8522752B2 (en) * 2010-09-03 2013-09-03 Caterpillar Inc. Co-axial quill assembly for dual fuel common rail system
FI124086B (en) * 2011-02-09 2014-03-14 Wärtsilä Finland Oy Pipe coupling and fuel injection system
US8683979B2 (en) 2011-02-14 2014-04-01 Caterpillar Inc. Dual fuel common rail system and engine using same
CN114135415B (en) * 2021-11-30 2023-05-09 中车大连机车车辆有限公司 Method and structure for monitoring water leakage and air leakage in cylinder cover in real time during operation
JP7495142B2 (en) 2022-05-09 2024-06-04 株式会社ベスト Brake device and sliding door

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Publication number Priority date Publication date Assignee Title
US3845748A (en) * 1972-09-29 1974-11-05 Mack Trucks Fuel injection nozzle holder installation
JPH05195906A (en) * 1992-01-21 1993-08-06 Mazda Motor Corp Fuel passage structure for internal combustion engine
DE19608572A1 (en) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Fuel supply device
GB9727421D0 (en) * 1997-12-30 1998-02-25 Perkins Ltd Apparatus and method for connecting a fuel pressure tube to a fuel injector of an internal combustion engine

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WO2008019415A1 (en) 2008-02-21

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