EP1570172B1 - Method for producing high pressure fuel accumulators - Google Patents

Method for producing high pressure fuel accumulators Download PDF

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Publication number
EP1570172B1
EP1570172B1 EP03785495A EP03785495A EP1570172B1 EP 1570172 B1 EP1570172 B1 EP 1570172B1 EP 03785495 A EP03785495 A EP 03785495A EP 03785495 A EP03785495 A EP 03785495A EP 1570172 B1 EP1570172 B1 EP 1570172B1
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EP
European Patent Office
Prior art keywords
pressure fuel
profile
base body
connections
fuel accumulator
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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.)
Expired - Fee Related
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EP03785495A
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German (de)
French (fr)
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EP1570172A1 (en
Inventor
Georg Weigl
Wolfgang Buchhauser
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Siemens AG
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Siemens AG
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Publication of EP1570172A1 publication Critical patent/EP1570172A1/en
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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
    • 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
    • F02M55/025—Common rails
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/08—Modifying the physical properties of iron or steel by deformation by cold working of the surface by burnishing or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making

Definitions

  • the invention relates to a high-pressure fuel accumulator for a fuel injection system of an internal combustion engine, having a tubular base body, with a plurality of terminals and at least one fastening element, wherein the tubular base body is integrally formed with the terminals and with the fastening element.
  • a high-pressure fuel accumulator for a fuel injection system of an internal combustion engine is known, with a tubular body and at least one connection for the fuel supply and the fuel discharge.
  • the basic body consists of a first tubular element and a second element arranged in the interior of the first tubular element.
  • a high-pressure fuel storage which is formed as a tube-like body by forging, with also by forging, integrally molded terminals and fasteners.
  • the connections and the fastening elements are each formed with an exact fit on the tubular base body, whereby a different forging blanks is required for each engine variant. Especially for small batches, this results in very high unit costs.
  • forged high-pressure fuel accumulator DE 199 36 534 A1 proposes to form the tubular base body with a continuous terminal block.
  • the connections can be introduced by drilling as needed.
  • the fasteners are either clamped or welded to the tubular Grundköper with mounting tabs.
  • the clamped attachment tabs need however, an additional space requirement and can be solved over time. Due to the welding process, when welding the welded-on fastening straps, a certain distance must be maintained between the individual fastening straps. This can lead to the size of the distributor is largely specified by the mounting tabs for very compact fuel manifolds.
  • DE 39 36 432 A1 therefore discloses a method in which a semi-finished part is produced, in which a first process stage consists of an extrusion of a metallic semi-finished part.
  • a first process stage consists of an extrusion of a metallic semi-finished part.
  • such semi-finished parts have a low component strength.
  • the object of the invention is to provide a simple and cost-effective method for producing a high-pressure fuel storage, wherein at the same time solidification of the surface is achieved.
  • the invention is characterized in that a hollow profile of the tubular body is extruded with at least one terminal block and / or a fastening strip profile.
  • the profile extrusion offers the advantage that the high-pressure fuel storage can be easily adapted individually to the engine conditions.
  • the hollow profile leaves the extruded section initially in the form of a long profile blank. From a profile blank, several high-pressure fuel storage can be produced. For this purpose, the profile blank divided into several pieces. Each section is so separated from the profile blank that it already has the desired length. Since a hollow profile is already formed by the profile extrusion, eliminating the otherwise necessary, expensive and complicated deep hole drilling.
  • Cold forming of the high-pressure fuel accumulator achieves solidification of the surface.
  • Oak such cold forming can be achieved for example by tightening the pipe profile by a slightly smaller press die.
  • the connections can be introduced in almost any distance from each other.
  • the introduction of the connections is preferably carried out by drilling.
  • the minimum distance between the individual terminals is limited only by the component strength, i. it is only necessary to maintain a minimum wall thickness between the individual connections.
  • the connections can be individually and inexpensively adapted to the individual engine variants.
  • the introduction of the mounting hole takes place in the fastening strip. The method thus enables the production of very compact high-pressure fuel spoke.
  • the proposed high-pressure fuel storage is thus much easier and cheaper to produce compared to the previous solutions.
  • By the method can be realized in particular for small series or prototypes cost-effective high-pressure fuel storage.
  • connection bore are introduced into the connection line, or the fastening holes are introduced into the fastening strip
  • the superfluous material between the individual holes cut out by a separation process from the corresponding bars.
  • separation process results in individual connecting pieces or fasteners instead of the strips.
  • FIG. 1 shows a longitudinal section through the high-pressure fuel accumulator.
  • the high-pressure fuel storage 1 consists of a tubular base body 2 with a first terminal block 5, a second terminal strip 6 and a fastening strip 7, which are integrally formed with the tubular body. Furthermore, the high-pressure fuel accumulator 1 has a longitudinal bore 13 which forms the high-pressure fuel accumulator.
  • a first terminal 3 is introduced which serves to the high-pressure fuel storage 1 to supply fuel.
  • a second and a third terminal 4 are introduced, which are connected via lines, not shown, with the injectors.
  • the fastening strip 7 has fastening holes 8.
  • the mounting holes are preferably formed as a through hole and are used for receiving fastening screw with which the high-pressure fuel storage 1 is attached to the internal combustion engine.
  • the terminals 3, 4 and the through holes 8 are preferably made by drilling.
  • FIG. 2 shows a cross section of the high-pressure fuel accumulator 1 described in FIG. 1.
  • the cross-sectional profile with the longitudinal bore 13 is produced by extrusion.
  • a heated to the pressing temperature metal block is placed in a cylindrical receiving tube of the press and pressed by means of a stamping pressure through a provided with the desired profile die.
  • the block is punched in advance during extrusion and the metal is pressed through the remaining space between the die opening and the mandrel by means of a mandrel arranged on the punch.
  • only the terminals 3, 4 and the mounting holes 8 need to be introduced into the high-pressure fuel storage 1 and the open ends of the longitudinal bore 13 are closed by corresponding, not shown sealing plug.
  • the number, the location and the shape of the terminals is not limited to the embodiment.
  • the maximum number of connections is determined by the diameter of the connections and the minimum required wall thickness between the individual connections.
  • the connections do not have to open radially into the longitudinal bore 13, as shown in the exemplary embodiment, but may, for example, also run tangentially to the longitudinal bore 13. Deviations from the circular cross section of the connections are also possible, for example elliptical cross sections.
  • FIG. 3 shows a high-pressure fuel accumulator 1 in which the superfluous material has been separated from the terminal strips 5, 6.
  • a separation method is preferably a milling method whereby the separation of the superfluous material can be done in a very simple and cost-effective manner.
  • the proposed method is thus suitable in a very cost-effective manner to form a high-pressure fuel storage consisting of a tubular body with integrally formed terminal strips and at least one fastening strip.
  • the position of the connections can be freely selected along the connection strips.
  • the connections can be made at a very close distance from each other.
  • the mounting holes can be arranged in a very close distance from each other.

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

Description

Die Erfindung betrifft einen Kraftstoffhochdruckspeicher für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem rohrartigen Grundkörper, mit mehreren Anschlüssen und mit mindestens einem Befestigungselement, wobei der rohrartige Grundkörper mit den Anschlüssen sowie mit dem Befestigungselement einstückig ausgebildet ist.The invention relates to a high-pressure fuel accumulator for a fuel injection system of an internal combustion engine, having a tubular base body, with a plurality of terminals and at least one fastening element, wherein the tubular base body is integrally formed with the terminals and with the fastening element.

Aus der DE 197 20 913 C1 ist ein Kraftstoffhochdruckspeicher für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine bekannt, mit einem rohrartigen Grundkörper und mindestens einem Anschluss für die Kraftstoffzufuhr und die Kraftstoffabfuhr. Der Grundkörper besteht dabei jedoch aus einem ersten rohrförmigen Element und einem im Inneren des ersten rohrförmigen Elements angeordneten zweiten Element.From DE 197 20 913 C1 a high-pressure fuel accumulator for a fuel injection system of an internal combustion engine is known, with a tubular body and at least one connection for the fuel supply and the fuel discharge. However, the basic body consists of a first tubular element and a second element arranged in the interior of the first tubular element.

Aus der DE 295 21 402 U1 ist ein Kraftstoffhochdruckspeicher bekannt, der als rohrartiger Grundkörper durch Schmieden geformt ist, mit ebenfalls durch Schmieden, einstückig angeformten Anschlüssen und Befestigungselementen. Für jede Motorvariante werden die Anschlüsse sowie die Befestigungselemente jeweils passgenau am rohrförmigen Grundkörper ausgebildet, wodurch für jede Motorvariante jeweils ein anderer Schmiederohlinge benötigt wird. Insbesondere bei Kleinserien ergeben sich hierdurch sehr hohe Stückkosten.From DE 295 21 402 U1 a high-pressure fuel storage is known, which is formed as a tube-like body by forging, with also by forging, integrally molded terminals and fasteners. For each engine variant, the connections and the fastening elements are each formed with an exact fit on the tubular base body, whereby a different forging blanks is required for each engine variant. Especially for small batches, this results in very high unit costs.

Um die Kosten für derartig, geschmiedete Kraftstoffhochdruckspeicher zu reduzieren schlägt die DE 199 36 534 A1 vor, den rohrförmigen Grundkörper mit einer durchgehenden Anschlussleiste auszubilden. In der durchgehenden Anschlussleiste können die Anschlüsse je nach Bedarf durch Bohren eingebracht werden. Die Befestigungselemente werden entweder mit Befestigungslaschen auf den rohrförmigen Grundköper festgeklemmt oder angeschweißt. Die geklemmten Befestigungslaschen benötigen allerdings einen zusätzlichen Raumbedarf und können sich mit der Zeit lösen. Bei den angeschweißten Befestigungslaschen muss, auf Grund des Schweißvorgangs, beim Aufbringen der Schweißnähte ein gewisser Abstand zwischen den einzelnen Befestigungslaschen eingehalten werden. Dies kann dazu führen, dass bei sehr kompakten Kraftstoffverteilern die Baugröße des Verteilers weitgehend durch die Befestigungslaschen vorgegeben wird.In order to reduce the costs for such, forged high-pressure fuel accumulator DE 199 36 534 A1 proposes to form the tubular base body with a continuous terminal block. In the continuous terminal block, the connections can be introduced by drilling as needed. The fasteners are either clamped or welded to the tubular Grundköper with mounting tabs. The clamped attachment tabs need however, an additional space requirement and can be solved over time. Due to the welding process, when welding the welded-on fastening straps, a certain distance must be maintained between the individual fastening straps. This can lead to the size of the distributor is largely specified by the mounting tabs for very compact fuel manifolds.

Darüber hinaus besteht bei allen geschmiedeten Kraftstoffverteilern der Nachteil, dass der Druckspeicher durch einen teuren und komplizierten Tieflochbohrvorgang im Schmiedegrundkörper hergestellt werden muss.In addition, there is the disadvantage in all forged fuel manifolds that the pressure accumulator must be prepared by an expensive and complicated deep hole drilling in Schmiedegrundkörper.

Die DE 39 36 432 A1 offenbart deshalb ein Verfahren, bei dem ein Halbfertigteil hergestellt wird, bei dem eine erste Verfahrensstufe aus einem Extrudieren eines metallischen Halbfertigteils besteht. Solche Halbfertigteile weisen jedoch eine geringe Bauteilfestigkeit auf.DE 39 36 432 A1 therefore discloses a method in which a semi-finished part is produced, in which a first process stage consists of an extrusion of a metallic semi-finished part. However, such semi-finished parts have a low component strength.

Aufgabe der Erfindung ist es, ein einfaches und kostengünstiges Verfahren zum Herstellen eines Kraftstoffhochdruckspeicher bereitzustellen, bei dem gleichzeitig eine Verfestigung der Oberfläche erzielt wird.The object of the invention is to provide a simple and cost-effective method for producing a high-pressure fuel storage, wherein at the same time solidification of the surface is achieved.

Die Aufgabe wird gelöst durch die Merkmale des unabhängigen Patentanspruchs. Vorteilhafte Ausgestaltung der Erfindung sind in den Unteransprüchen gekennzeichnet.The object is solved by the features of the independent claim. Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung zeichnet sich dadurch aus, dass ein Hohlprofil des rohrartigen Grundkörpers mit mindestens einer Anschlussleiste und/oder einer Befestigungsleiste profilstranggepresst wird. Das Profilstrangpressen bietet den Vorteil, dass der Kraftstoffhochdruckspeicher auf einfache Weise individuell an die Motorgegebenheiten angepasst werden kann. Das Hohlprofil verlässt die Profilstrangpresse zunächst in Form eines langen Profilrohlings. Aus einem Profilrohling lassen sich mehrere Kraftstoffhochdruckspeicher herstellen. Hierzu wird der Profilrohling in mehrere Stücke geteilt. Jedes Teilstück wird derart von Profilrohling abgetrennt, das es bereits die gewünschte Länge besitzt. Da durch das Profilstrangpressen bereits ein Hohlprofil ausgebildet wird, entfällt der sonst notwendige, teure und komplizierte Tieflochbohrvorgang.The invention is characterized in that a hollow profile of the tubular body is extruded with at least one terminal block and / or a fastening strip profile. The profile extrusion offers the advantage that the high-pressure fuel storage can be easily adapted individually to the engine conditions. The hollow profile leaves the extruded section initially in the form of a long profile blank. From a profile blank, several high-pressure fuel storage can be produced. For this purpose, the profile blank divided into several pieces. Each section is so separated from the profile blank that it already has the desired length. Since a hollow profile is already formed by the profile extrusion, eliminating the otherwise necessary, expensive and complicated deep hole drilling.

Durch eine Kaltumformung des Kraftstoffhochdruckspeichers wird eine Verfestigung der Oberfläche erzielt. Eiche solche Kaltumformung lässt sich beispielsweise durch Nachziehen des Rohrprofils durch eine geringfügig kleinere Pressmatrize erreichen.Cold forming of the high-pressure fuel accumulator achieves solidification of the surface. Oak such cold forming can be achieved for example by tightening the pipe profile by a slightly smaller press die.

In die einstückig mit dem Grundkörper ausgebildeten Anschlussleiste können die Anschlüsse in nahezu beliebigen Abstand zueinander eingebracht werden. Das Einbringen der Anschlüsse erfolgt vorzugsweise durch Bohren. Der minimale Abstand der einzelnen Anschlüsse zueinander ist nur durch die Bauteilfestigkeit beschränkt, d.h. es muss lediglich eine minimale Wandstärke zwischen den einzelnen Anschlüssen eingehalten werden. Hierdurch lassen sich die Anschlüsse individuell und preisgünstig an die einzelnen Motorvarianten anpassen. In gleicher Weise erfolgt das Einbringen der Befestigungsbohrung in die Befestigungsleiste. Das Verfahren ermöglicht somit das Herstellen sehr kompakter Kraftstoffhochdruckspeiche.In the integrally formed with the main body terminal block, the connections can be introduced in almost any distance from each other. The introduction of the connections is preferably carried out by drilling. The minimum distance between the individual terminals is limited only by the component strength, i. it is only necessary to maintain a minimum wall thickness between the individual connections. As a result, the connections can be individually and inexpensively adapted to the individual engine variants. In the same way, the introduction of the mounting hole takes place in the fastening strip. The method thus enables the production of very compact high-pressure fuel spoke.

Änderungen des Profils lassen sich mit dem Verfahren ebenfalls schnell und preiswert realisieren, da für unterschiedliche Profile lediglich die Pressmatrize ausgewechselt werden muss. Diese ist aufgrund ihres einfachen Aufbaus sehr kostengünstig.Changes to the profile can also be implemented quickly and inexpensively with the method since only the pressing die needs to be replaced for different profiles. This is very inexpensive due to its simple structure.

Der vorgeschlagene Kraftstoffhochdruckspeicher ist somit im Vergleich zu den bisherigen Lösungen wesentlicher einfacher und kostengünstiger herstellbar. Durch das Verfahren lassen sich insbesondere auch für Kleinserien oder Prototypen kostengünstige Kraftstoffhochdruckspeicher realisieren.The proposed high-pressure fuel storage is thus much easier and cheaper to produce compared to the previous solutions. By the method can be realized in particular for small series or prototypes cost-effective high-pressure fuel storage.

In einer besonders vorteilhaften Ausgestaltung der Erfindung wird nachdem die Anschlussbohrung in die Anschlussleitung eingebracht sind, oder die Befestigungsbohrungen in die Befestigungsleiste eingebracht sind, das überflüssige Material zwischen den einzelnen Bohrungen durch ein Trennverfahren aus den entsprechenden Leisten herausgetrennt. Hierdurch ergeben sich einzelne Anschlussstutzen beziehungsweise Befestigungselemente anstelle der Leisten. Durch das Heraustrennen des überflüssigen Materials ergibt sich ein besonders gewichtsoptimierter Kraftstoffhochdruckspeicher. Zum Heraustrennen des überflüssigen Materials eignen sich alle bekannten Trennverfahren, besonders vorteilhaft sind spanabhebende Verfahren wie Fräsen oder Hobeln.In a particularly advantageous embodiment of the invention, after the connection bore are introduced into the connection line, or the fastening holes are introduced into the fastening strip, the superfluous material between the individual holes cut out by a separation process from the corresponding bars. This results in individual connecting pieces or fasteners instead of the strips. By separating out the superfluous material results in a particularly weight-optimized high-pressure fuel storage. For separating out the superfluous material, all known separation methods are suitable, particularly advantageous are machining methods such as milling or planing.

Ausführungsbeispiele der Erfindung werden im folgenden anhand der schematischen Zeichnungen erläutert. Es zeigt:

  • Figur 1 einen Längsschnitt durch einen Kraftstoffhochdruckspeicher, mit zwei Anschlussleisten sowie einer Befestigungsleiste,
  • Figur 2 einen Querschnitt durch den selben Kraftstoffhochdruckspeicher,
  • Figur 3 einen Kraftstoffhochdruckspeicher bei dem das überflüssige Material zwischen den einzelnen Anschlussbohrungen durch ein Trennverfahren aus den Anschlussleisten herausgetrennt wurde.
Embodiments of the invention are explained below with reference to the schematic drawings. It shows:
  • 1 shows a longitudinal section through a high-pressure fuel storage, with two terminal strips and a fixing strip,
  • 2 shows a cross section through the same high-pressure fuel storage,
  • 3 shows a high-pressure fuel storage in which the superfluous material between the individual connection holes was separated out by a separation process from the terminal strips.

Figur 1 zeigt einen Längsschnitt durch den Kraftstoffhochdruckspeicher. Der Kraftstoffhochdruckspeicher 1 besteht aus einem rohrartigen Grundkörper 2 mit einer ersten Anschlussleiste 5, einer zweiten Anschlussleite 6 sowie einer Befestigungsleiste 7, die einstückig mit dem rohrartigen Grundkörper ausgebildet sind. Des weiteren weist der Kraftstoffhochdruckspeicher 1 eine Längsbohrung 13 auf, die den Kraftstoffhochdruckspeicher bildet. In die erste Anschlussleiste 5 ist ein erster Anschluss 3 eingebracht der dazu dient den Kraftstoffhochdruckspeicher 1 mit Kraftstoff zu versorgen. In die zweite Anschlussleiste 6 sind ein zweiter und ein dritter Anschluss 4 eingebracht die, über nicht dargestellte Leitungen, mit den Einspritzventile verbunden sind. Die Befestigungsleiste 7 weist Befestigungsbohrungen 8 auf. Die Befestigungsbohrungen sind vorzugsweise als Durchgangsbohrung ausgebildet und dienen zur Aufnahme von Befestigungsschraube mit denen der Kraftstoffhochdruckspeicher 1 an der Brennkraftmaschine befestigt wird. Die Anschlüsse 3, 4 sowie die Durchgangsbohrungen 8 werden vorzugsweise durch Bohren hergestellt.FIG. 1 shows a longitudinal section through the high-pressure fuel accumulator. The high-pressure fuel storage 1 consists of a tubular base body 2 with a first terminal block 5, a second terminal strip 6 and a fastening strip 7, which are integrally formed with the tubular body. Furthermore, the high-pressure fuel accumulator 1 has a longitudinal bore 13 which forms the high-pressure fuel accumulator. In the first terminal block 5, a first terminal 3 is introduced which serves to the high-pressure fuel storage 1 to supply fuel. In the second terminal block 6, a second and a third terminal 4 are introduced, which are connected via lines, not shown, with the injectors. The fastening strip 7 has fastening holes 8. The mounting holes are preferably formed as a through hole and are used for receiving fastening screw with which the high-pressure fuel storage 1 is attached to the internal combustion engine. The terminals 3, 4 and the through holes 8 are preferably made by drilling.

Figur 2 zeigt einen Querschnitt des in Figur 1 beschriebenen Kraftstoffhochdruckspeichers 1. Das Querschnittsprofil mit der Längsbohrung 13 wird durch Strangpressen hergestellt. Beim Strangpressen wird ein auf die Presstemperatur erwärmter Metallblock in ein zylinderförmigen Aufnahmerohr der Presse gegeben und mittels eines Stempeldrucks durch eine mit dem gewünschten Profil versehene Matrize gepresst. Zur Erzeugung des Hohlprofils wird beim Strangpressen der Block vorher gelocht und das Metall mittels eines am Presstempel angeordneten Dorns durch den verbleibenden Raum zwischen der Matrizenöffnung und dem Dorn hindurchgepresst. Nach dem Strangpressen müssen lediglich noch die Anschlüsse 3, 4 sowie die Befestigungsbohrungen 8 in dem Kraftstoffhochdruckspeicher 1 eingebracht werden und die offenen Enden der Längsbohrung 13 durch entsprechende, nicht dargestellte Verschlussstopfen verschlossen werden. Selbstverständlich ist die Anzahl, die Lage und die Form der Anschlüsse nicht auf das Ausführungsbeispiel beschränkt. Die maximale Anzahl von Anschlüssen ergibt sich durch den Durchmesser der Anschlüsse und die minimal erforderliche Wandstärke zwischen den einzelnen Anschlüssen. Die Anschlüsse müssen nicht, wie im Ausführungsbeispiel gezeigt, radial in die Längsbohrung 13 einmünden sondern können beispielsweise auch tangential zur Längsbohrung 13 verlaufen. Auch Abweichungen vom kreisförmigen Querschnitt der Anschlüsse sind möglich wie beispielsweise elliptische Querschnitte.FIG. 2 shows a cross section of the high-pressure fuel accumulator 1 described in FIG. 1. The cross-sectional profile with the longitudinal bore 13 is produced by extrusion. During extrusion, a heated to the pressing temperature metal block is placed in a cylindrical receiving tube of the press and pressed by means of a stamping pressure through a provided with the desired profile die. To produce the hollow profile, the block is punched in advance during extrusion and the metal is pressed through the remaining space between the die opening and the mandrel by means of a mandrel arranged on the punch. After extrusion, only the terminals 3, 4 and the mounting holes 8 need to be introduced into the high-pressure fuel storage 1 and the open ends of the longitudinal bore 13 are closed by corresponding, not shown sealing plug. Of course, the number, the location and the shape of the terminals is not limited to the embodiment. The maximum number of connections is determined by the diameter of the connections and the minimum required wall thickness between the individual connections. The connections do not have to open radially into the longitudinal bore 13, as shown in the exemplary embodiment, but may, for example, also run tangentially to the longitudinal bore 13. Deviations from the circular cross section of the connections are also possible, for example elliptical cross sections.

Um das Gewicht des Kraftstoffhochdruckspeichers 1 zu minimieren ist es besonders vorteilhaft das überflüssige Material zwischen den Anschlussbohrungen 3, 4 sowie zwischen den einzelnen Befestigungsbohrungen 8 durch ein Trennverfahren aus den Anschlussleisten 5, 6 beziehungsweise der Befestigungsleise 7 heraus zu trennen. Figur 3 zeigt einen Kraftstoffhochdruckspeicher 1 bei dem das überflüssige Material aus den Anschlussleisten 5, 6, herausgetrennt wurde. Dadurch ergeben sich anstelle der ersten bzw. zweiten Anschlussleiste 5, 6 lediglich drei Anschlussstutzen 9, 14 und 15. Auf diese Weise lässt sich das Gewicht des Kraftstoffhochdruckspeichers 1 erheblich reduzieren ohne die Festigkeit des Bauteils zu verringern. Als Trennverfahren eignet sich vorzugsweise ein Fräsverfahren wodurch das Abtrennen des überflüssigen Materials auf sehr einfache und kostengünstige Weise erfolgen kann.In order to minimize the weight of the high-pressure fuel accumulator 1, it is particularly advantageous for the superfluous material between the connecting holes 3, 4 and between the individual mounting holes 8 by a separation process the terminal strips 5, 6 or the Befestigungsleise 7 to separate out. FIG. 3 shows a high-pressure fuel accumulator 1 in which the superfluous material has been separated from the terminal strips 5, 6. As a result, only three connecting pieces 9, 14 and 15 result instead of the first and second terminal block 5, 6. In this way, the weight of the high-pressure fuel storage 1 can be significantly reduced without reducing the strength of the component. As a separation method is preferably a milling method whereby the separation of the superfluous material can be done in a very simple and cost-effective manner.

Das vorgeschlagene Verfahren ist somit geeignet auf sehr kostengünstige Weise einen Kraftstoffhochdruckspeicher bestehend aus einem rohrartigen Grundkörper mit einstückig ausgebildeten Anschlussleisten und mindestens einer Befestigungsleiste auszubilden. Die Lage der Anschlüsse lässt sich entlang der Anschlussleisten beliebig frei wählen. Die Anschlüsse können dabei in einem sehr engem Abstand zueinander eingebracht werden. Ebenso lassen sich die Befestigungsbohrungen in einem sehr engen Abstand zueinander anordnen. Durch ein Trennverfahren kann das überflüssige Material von Kraftstoffhochdruckspeicher kostengünstig abtrennen werden, wodurch sich eine Gewichtsminimierung des Kraftstoffhochdruckspeichers erzielen lässt.The proposed method is thus suitable in a very cost-effective manner to form a high-pressure fuel storage consisting of a tubular body with integrally formed terminal strips and at least one fastening strip. The position of the connections can be freely selected along the connection strips. The connections can be made at a very close distance from each other. Likewise, the mounting holes can be arranged in a very close distance from each other. Through a separation process, the superfluous material can be separated from high-pressure fuel storage cost, whereby a weight reduction of the high-pressure fuel storage can be achieved.

Claims (3)

  1. Method for producing a high-pressure fuel accumulator (1) for a fuel injection system of an internal combustion engine, comprising
    - a tubular base body (2),
    - at least one connection for the fuel supply (3),
    - at least one connection for the fuel discharge (4), and
    - at least one fixing element,
    whereby the tubular base body (2) forms a construction with the connections (3)(4) and the fixing element as a single component, and whereby the tubular base body (2) is profile-extruded with at least one connector strip (5)(6) and/or one fixing strip (7),
    characterised in that
    a hardening of the surface is achieved by means of a cold working of the high-pressure fuel accumulator.
  2. Method for producing a high-pressure fuel accumulator (1) according to Claim 1,
    characterised in that
    the cold working takes place by redrawing the tube profile through a second extruding die which is slightly smaller when compared with a first extruding die.
  3. Method for producing a high-pressure fuel accumulator (1) according to Claim 1 or 2,
    characterised in that
    superfluous material is removed from the connector strip (5)(6) by means of a separating method and individual connecting pieces (9) remain in place and/or superfluous material is removed from the fixing strip (7) by means of a separating method and individual fixing elements remain in place.
EP03785495A 2002-12-04 2003-11-05 Method for producing high pressure fuel accumulators Expired - Fee Related EP1570172B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10256703A DE10256703B3 (en) 2002-12-04 2002-12-04 Production of a fuel high pressure storage unit for a fuel injection system of an engine comprises extruding a hollow profile of a tubular base body with connecting strips and/or fixing strips
DE10256703 2002-12-04
PCT/DE2003/003669 WO2004051075A1 (en) 2002-12-04 2003-11-05 Method for producing high pressure fuel accumulators

Publications (2)

Publication Number Publication Date
EP1570172A1 EP1570172A1 (en) 2005-09-07
EP1570172B1 true EP1570172B1 (en) 2006-07-19

Family

ID=31969766

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Application Number Title Priority Date Filing Date
EP03785495A Expired - Fee Related EP1570172B1 (en) 2002-12-04 2003-11-05 Method for producing high pressure fuel accumulators

Country Status (5)

Country Link
US (1) US20060053626A1 (en)
EP (1) EP1570172B1 (en)
JP (1) JP2006509144A (en)
DE (2) DE10256703B3 (en)
WO (1) WO2004051075A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1705366A1 (en) * 2005-03-03 2006-09-27 Siemens Aktiengesellschaft High-pressure fuel storage unit
JP6021220B2 (en) * 2012-11-16 2016-11-09 ボッシュ株式会社 Common rail

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795970A (en) * 1973-01-23 1974-03-12 A Keathley Processes for extruding a product
US4570602A (en) * 1982-08-23 1986-02-18 General Motors Corporation Fuel rail
US4470188A (en) * 1982-08-31 1984-09-11 The Babcock & Wilcox Company Method of mechanically prestressing a tubular apparatus
US4899712A (en) * 1983-06-21 1990-02-13 Gerard De Bruyn Fuel injection rail manufacturing means and process
JPS63125171U (en) * 1987-02-09 1988-08-16
IT1219300B (en) * 1988-05-13 1990-05-03 Weber Srl PROCEDURE FOR THE CONSTRUCTION OF A FUEL MANIFOLD FOR A FUEL SUPPLY SYSTEM OF AN INTERNAL COMBUSTION ENGINE
IT1223881B (en) * 1988-11-03 1990-09-29 Weber Srl PROCEDURE FOR THE CONSTRUCTION OF A FUEL COLLECTOR SUITABLE FOR SUPPLYING FUEL TO THE DOSING AND PULVERIZING VALVES OF A FUEL DEVICE FOR AN INTERNAL COMBUSTION ENGINE
DE4126017A1 (en) * 1990-12-20 1992-07-02 Detlef Dipl Ing Bloecker BRAKE CYLINDER AND METHOD FOR THE PRODUCTION THEREOF
DE29521402U1 (en) * 1995-12-23 1997-04-24 Robert Bosch Gmbh, 70469 Stuttgart Fuel injection system
DE19720913C1 (en) * 1997-05-16 1998-08-20 Mtu Friedrichshafen Gmbh Diesel engine fuel injection system with common controller reservoir
DE19726991A1 (en) * 1997-06-25 1999-01-07 Bosch Gmbh Robert Valve and method for manufacturing a valve seat for a valve
DE19757117A1 (en) * 1997-12-20 1999-06-24 Bosch Gmbh Robert Valve seat body fabrication method for fuel injection valve
JP2001295723A (en) * 2000-04-13 2001-10-26 Denso Corp Pressure accumulation type fuel injection device
US6705083B2 (en) * 2001-07-31 2004-03-16 Delphi Technologies, Inc. Master cylinder having a compact profile

Also Published As

Publication number Publication date
DE50304307D1 (en) 2006-08-31
US20060053626A1 (en) 2006-03-16
EP1570172A1 (en) 2005-09-07
DE10256703B3 (en) 2004-04-01
JP2006509144A (en) 2006-03-16
WO2004051075A1 (en) 2004-06-17

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