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EP1570172A1 - Method for producing high pressure fuel accumulators - Google Patents

Method for producing high pressure fuel accumulators

Info

Publication number
EP1570172A1
EP1570172A1 EP03785495A EP03785495A EP1570172A1 EP 1570172 A1 EP1570172 A1 EP 1570172A1 EP 03785495 A EP03785495 A EP 03785495A EP 03785495 A EP03785495 A EP 03785495A EP 1570172 A1 EP1570172 A1 EP 1570172A1
Authority
EP
European Patent Office
Prior art keywords
pressure fuel
base body
connection
fastening
tubular base
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
EP03785495A
Other languages
German (de)
French (fr)
Other versions
EP1570172B1 (en
Inventor
Georg Weigl
Wolfgang Buchhauser
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1570172A1 publication Critical patent/EP1570172A1/en
Application granted granted Critical
Publication of EP1570172B1 publication Critical patent/EP1570172B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F02M55/02—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, with a tubular base body, with a plurality of connections and with at least one fastening element, the tubular base body being formed in one piece with the connections and with the fastening element.
  • a high-pressure fuel dispenser for a fuel injection system of an internal combustion engine with a tubular base body and at least one connection for the fuel supply and the fuel removal.
  • the base body consists of a first tubular element and a second element arranged in the interior of the first tubular element.
  • a high-pressure fuel accumulator which is formed as a tubular base body by forging, also with forging, integrally molded connections and fastening elements.
  • the connections and the fastening elements are each formed precisely on the tubular base body, which means that a different forging blank is required for each motor variant. This results in very high unit costs, especially for small series.
  • DE 199 36 534 A1 proposes to design the tubular base body with a continuous connection strip.
  • the connections can be made in the continuous connection strip by drilling as required.
  • the fastening elements are either clamped onto the tubular base body with fastening lugs or welded on.
  • the clamped fastening tabs However, they take up additional space and can become detached over time.
  • With the welded mounting brackets a certain distance between the individual mounting brackets must be maintained due to the welding process when applying the weld seams. This can lead to the fact that, in the case of very compact fuel prices, the size of the distributor is largely predetermined by the fastening tabs.
  • the object of the invention is to provide a simple and inexpensive method for producing a high-pressure fuel accumulator.
  • the invention is characterized in that a hollow profile of the tubular base body is extruded with at least one connecting bar and / or a fastening bar.
  • the extrusion profile has the advantage that the high-pressure fuel accumulator can be easily adapted to the engine conditions.
  • the hollow profile first leaves the extrusion press in the form of a long profile blank.
  • Several high-pressure fuel reservoirs can be produced from a blank profile.
  • the profile blank is divided into several pieces. Each section is separated from the profile blank in such a way that it already has the desired length. Since a hollow profile is already formed by the extrusion, the otherwise necessary, expensive and complicated deep hole drilling process is eliminated.
  • the connections can be made at almost any distance from one another in the connection strip formed in one piece with the base body.
  • the connections are preferably made by drilling.
  • the minimum distance between the individual connections is only limited by the strength of the component, ie only a minimum wall thickness between the individual connections has to be observed. This allows the connections to be individually and inexpensively adapted to the individual motor variants.
  • the fixing hole is drilled in the fixing strip in the same way. The method thus enables the production of very compact high-pressure fuel spokes.
  • the proposed high-pressure fuel reservoir is thus much easier and cheaper to manufacture than the previous solutions.
  • the method can also be used to implement low-cost high-pressure fuel stores, especially for small series or prototypes.
  • the superfluous material between the individual holes is separated from the corresponding strips by a separation process.
  • Removing the superfluous material results in a particularly weight-optimized high-pressure fuel reservoir. All known separation methods are suitable for removing the superfluous material. driving, cutting processes such as milling or planing are particularly advantageous.
  • Another preferred embodiment of the invention provides for the surface of the high-pressure fuel reservoir to be additionally strengthened by cold working.
  • Cold forming can be achieved, for example, by retightening the tube profile using a slightly smaller press die.
  • FIG. 1 shows a longitudinal section through a high-pressure fuel accumulator, with two connection strips and a fastening strip
  • FIG. 2 shows a cross section through the same high-pressure fuel reservoir
  • connection bore 3 shows a high-pressure fuel accumulator in which the excess material between the individual connection bores was separated from the connection strips by a separation process.
  • FIG. 1 shows a longitudinal section through the high-pressure fuel accumulator.
  • the high-pressure fuel accumulator 1 consists of a tubular base body 2 with a first connection strip 5, a second connection lead 6 and a fastening strip 7, which are formed in one piece with the tubular base body. Furthermore, the high-pressure fuel reservoir 1 has a longitudinal bore 13 which forms the high-pressure fuel reservoir.
  • a first connection 3 is introduced into the first connection bar 5 and is used to supply the high-pressure fuel accumulator 1 with fuel.
  • a second and a third connection 4 are introduced into the second connection strip 6 and are connected to the injection valves via lines (not shown).
  • the fastening bar 7 has mounting holes 8.
  • the fastening bores are preferably formed as a through hole and serve to receive fastening screws with which the high-pressure fuel accumulator 1 is fastened to the internal combustion engine.
  • the connections 3, 4 and the through bores 8 are preferably produced 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 metal block heated to the pressing temperature is placed in a cylindrical receiving tube of the press and pressed by means of a stamp pressure through a die provided with the desired profile.
  • the block is previously punched 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 press die.
  • the connections 3, 4 and the fastening bores 8 have to be made in the high-pressure fuel accumulator 1 and the open ends of the longitudinal bore 13 have to be closed by appropriate sealing plugs, not shown.
  • the number, the position and the shape of the connections are not limited to the exemplary embodiment. The maximum number of connections results from 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 can, for example, also run tangentially to the longitudinal bore 13.
  • Deviations from the circular cross section of the connections are also possible, such as elliptical cross sections.
  • FIG. 3 shows a high-pressure fuel accumulator 1 in which the superfluous material has been separated out from the connection strips 5, 6. This results in only three connecting pieces 9, 14 and 15 instead of the first or second connecting strip 5, 6. In this way, the weight of the high-pressure fuel accumulator 1 can be reduced considerably without reducing the strength of the component.
  • a milling process is preferably suitable as the separation process, as a result of which the superfluous material can be separated in a very simple and inexpensive manner.
  • the proposed method is thus suitable for forming a high-pressure fuel accumulator consisting of a tubular base body with integrally formed connection strips and at least one attachment strip in a very cost-effective manner.
  • the position of the connections can be freely selected along the connection strips.
  • the connections can be made very close to each other.
  • the mounting holes can also be arranged at a very close distance from each other.

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

The invention relates to a 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) and at least one connection for the fuel discharge, and at least one fixing element, said tubular base body (2) being embodied as a single component with the connections (3, 4) and the fixing element. The hollow profile of the tubular base body is extruded with the connector strips (5, 6) and the fixing strips (7).

Description

BesehreibungBesehreibung

Verfahren zur Herstellung von KraftstoffhochdruckspeichernProcess for the production of high pressure fuel accumulators

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 Befesti- gungselement einstückig ausgebildet ist.The invention relates to a high-pressure fuel accumulator for a fuel injection system of an internal combustion engine, with a tubular base body, with a plurality of connections and with at least one fastening element, the tubular base body being formed in one piece with the connections and with the fastening element.

Aus der DE 197 20 913 Cl ist ein Kraftstoffhochdruckspeieher für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine bekannt, mit einem rohrartigen Grundkörper und mindestens ei- nem Anschluss für die Kraftstoffzufuhr und die Kraftstoffabfuhr. Der Grundkörper besteht dabei jedoch aus einem ersten rohrför igen Element und einem im Inneren des ersten rohrför- migen Elements angeordneten zweiten Element .From DE 197 20 913 C1 a high-pressure fuel dispenser for a fuel injection system of an internal combustion engine is known, with a tubular base body and at least one connection for the fuel supply and the fuel removal. However, the base 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 Ul 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 Befestigungsele- mente 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 accumulator is known, which is formed as a tubular base body by forging, also with forging, integrally molded connections and fastening elements. For each motor variant, the connections and the fastening elements are each formed precisely on the tubular base body, which means that a different forging blank is required for each motor variant. This results in very high unit costs, especially for small series.

Um die Kosten für derartig, geschmiedete Kraftstoffhochdruck- speicher zu reduzieren schlägt die DE 199 36 534 AI 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 o- der angeschweißt. Die geklemmten Befestigungslaschen benöti- gen 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 Kraftstoffverteuern die Baugröße des Verteilers weitgehend durch die Befestigungslaschen vorgegeben wird.In order to reduce the costs for such forged high-pressure fuel accumulators, DE 199 36 534 A1 proposes to design the tubular base body with a continuous connection strip. The connections can be made in the continuous connection strip by drilling as required. The fastening elements are either clamped onto the tubular base body with fastening lugs or welded on. The clamped fastening tabs However, they take up additional space and can become detached over time. With the welded mounting brackets, a certain distance between the individual mounting brackets must be maintained due to the welding process when applying the weld seams. This can lead to the fact that, in the case of very compact fuel prices, the size of the distributor is largely predetermined by the fastening tabs.

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 of all forged fuel distributors that the pressure accumulator has to be manufactured in the forged basic body by an expensive and complicated deep hole drilling process.

Aufgabe der Erfindung ist es, ein einfaches und kostengünstiges Verfahren zum Herstellen eines Kraftstoffhochdruckspeicher bereitzustellen.The object of the invention is to provide a simple and inexpensive method for producing a high-pressure fuel accumulator.

Die Aufgabe wird gelöst durch die Merkmale des unabhängigen Patentanspruchs. Vorteilhafte Ausgestaltung der Erfindung sind in den Unteransprüchen gekennzeichnet.The object is achieved 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 Anschluss- leiste 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 be- reits ein Hohlprofil ausgebildet wird, entfällt der sonst notwendige, teure und komplizierte Tieflochbohrvorgang. 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 Ab- stand 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 anpas- sen. In gleicher Weise erfolgt das Einbringen der Befestigungsbohrung in die Befestigungsleiste. Das Verfahren ermöglicht somit das Herstellen sehr kompakter Kraftstoffhochdruckspeiche .The invention is characterized in that a hollow profile of the tubular base body is extruded with at least one connecting bar and / or a fastening bar. The extrusion profile has the advantage that the high-pressure fuel accumulator can be easily adapted to the engine conditions. The hollow profile first leaves the extrusion press in the form of a long profile blank. Several high-pressure fuel reservoirs can be produced from a blank profile. For this, the profile blank is divided into several pieces. Each section is separated from the profile blank in such a way that it already has the desired length. Since a hollow profile is already formed by the extrusion, the otherwise necessary, expensive and complicated deep hole drilling process is eliminated. The connections can be made at almost any distance from one another in the connection strip formed in one piece with the base body. The connections are preferably made by drilling. The minimum distance between the individual connections is only limited by the strength of the component, ie only a minimum wall thickness between the individual connections has to be observed. This allows the connections to be individually and inexpensively adapted to the individual motor variants. The fixing hole is drilled in the fixing strip in the same way. The method thus enables the production of very compact high-pressure fuel spokes.

Änderungen des Profils lassen sich mit dem Verfahren ebenfalls schnell und preiswert realisieren, da für unterschiedliche Profile lediglich die Pressmatritze 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 press die has to be replaced for different profiles. Due to its simple structure, this is very inexpensive.

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 kos- tengünstige Kraftstoffhochdruckspeicher realisieren.The proposed high-pressure fuel reservoir is thus much easier and cheaper to manufacture than the previous solutions. The method can also be used to implement low-cost high-pressure fuel stores, especially for small series or prototypes.

In einer besonders vorteilhaften Ausgestaltung der Erfindung wird nachdem die Anschlussbohrung in die Anschlussleitung eingebracht sind, oder die Befestigungsbohrungen in die Be- festigungsleiste 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 ü- berflüssigen Materials ergibt sich ein besonders gewichtsoptimierter Kraftstoffhochdruckspeicher . Zum Heraustrennen des überflüssigen Materials eignen sich alle bekannten Trennver- fahren, besonders vorteilhaft sind spanabhebende Verfahren wie Fräsen oder Hobeln.In a particularly advantageous embodiment of the invention, after the connection hole has been made in the connection line or the fastening holes have been made in the fastening strip, the superfluous material between the individual holes is separated from the corresponding strips by a separation process. This results in individual connecting pieces or fastening elements instead of the strips. Removing the superfluous material results in a particularly weight-optimized high-pressure fuel reservoir. All known separation methods are suitable for removing the superfluous material. driving, cutting processes such as milling or planing are particularly advantageous.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, die Oberfläche des Kraftstoffhochdruckspeichers durch Kaltumformung zusätzlich zu verfestigen. Die Kaltumformung lässt sich beispielsweise durch Nachziehen des Rohrprofils durch eine geringfügig kleinere Pressmatrize erreichen.Another preferred embodiment of the invention provides for the surface of the high-pressure fuel reservoir to be additionally strengthened by cold working. Cold forming can be achieved, for example, by retightening the tube profile using a slightly smaller press die.

Ausführungsbeispiele der Erfindung werden im folgenden anhand der schematischen Zeichnungen erläutert. Es zeigt:Embodiments of the invention are explained below with reference to the schematic drawings. It shows:

Figur 1 einen Längsschnitt durch einen Kraftstoffhochdruckspeicher, mit zwei Anschlussleisten sowie einer Befesti- gungsleiste,FIG. 1 shows a longitudinal section through a high-pressure fuel accumulator, with two connection strips and a fastening strip,

Figur 2 einen Querschnitt durch den selben Kraftstoffhochdruckspeicher,FIG. 2 shows a cross section through the same high-pressure fuel reservoir,

Figur 3 einen Kraftstoffhochdruckspeicher bei dem das überflüssige Material zwischen den einzelnen Anschlussbohrungen durch ein Trennverfahren aus den Anschlussleisten herausgetrennt wurde .3 shows a high-pressure fuel accumulator in which the excess material between the individual connection bores was separated from the connection strips by a separation process.

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 zwei- te Anschlussleiste 6 sind ein zweiter und ein dritter Anschluss 4 eingebracht die, über nicht dargestellte Leitungen, mit den Einspritzventile verbunden sind. Die Befestigungs- leiste 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.Figure 1 shows a longitudinal section through the high-pressure fuel accumulator. The high-pressure fuel accumulator 1 consists of a tubular base body 2 with a first connection strip 5, a second connection lead 6 and a fastening strip 7, which are formed in one piece with the tubular base body. Furthermore, the high-pressure fuel reservoir 1 has a longitudinal bore 13 which forms the high-pressure fuel reservoir. A first connection 3 is introduced into the first connection bar 5 and is used to supply the high-pressure fuel accumulator 1 with fuel. A second and a third connection 4 are introduced into the second connection strip 6 and are connected to the injection valves via lines (not shown). The fastening bar 7 has mounting holes 8. The fastening bores are preferably formed as a through hole and serve to receive fastening screws with which the high-pressure fuel accumulator 1 is fastened to the internal combustion engine. The connections 3, 4 and the through bores 8 are preferably produced by drilling.

Figur 2 zeigt einen Querschnitt des in Figur 1 beschriebenen Kraftstoffhochdruckspeichers 1. Das Querschnittsprofil mit der Längsbohrung 13 wird durch Strangpressen hergestellt.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.

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 Befesti- gungsbohrungen 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 bei- spielsweise auch tangential zur Längsbohrung 13 verlaufen.During extrusion, a metal block heated to the pressing temperature is placed in a cylindrical receiving tube of the press and pressed by means of a stamp pressure through a die provided with the desired profile. To produce the hollow profile, the block is previously punched 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 press die. After the extrusion, only the connections 3, 4 and the fastening bores 8 have to be made in the high-pressure fuel accumulator 1 and the open ends of the longitudinal bore 13 have to be closed by appropriate sealing plugs, not shown. Of course, the number, the position and the shape of the connections are not limited to the exemplary embodiment. The maximum number of connections results from 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 can, for example, also run tangentially to the longitudinal bore 13.

Auch Abweichungen vom kreisförmigen Querschnitt der Anschlüsse sind möglich wie beispielsweise elliptische Querschnitte.Deviations from the circular cross section of the connections are also possible, such as elliptical cross sections.

Um das Gewicht des Kraftstoffhochdruckspeichers 1 zu minimie- ren 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 Kraftstoff- hochdruckspeicher 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 to separate the unnecessary material between the connection bores 3, 4 and between the individual fastening bores 8 by a separation process to separate the connection strips 5, 6 or the fastening track 7. FIG. 3 shows a high-pressure fuel accumulator 1 in which the superfluous material has been separated out from the connection strips 5, 6. This results in only three connecting pieces 9, 14 and 15 instead of the first or second connecting strip 5, 6. In this way, the weight of the high-pressure fuel accumulator 1 can be reduced considerably without reducing the strength of the component. A milling process is preferably suitable as the separation process, as a result of which the superfluous material can be separated in a very simple and inexpensive 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 wer- den. 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 er- zielen lässt. The proposed method is thus suitable for forming a high-pressure fuel accumulator consisting of a tubular base body with integrally formed connection strips and at least one attachment strip in a very cost-effective manner. The position of the connections can be freely selected along the connection strips. The connections can be made very close to each other. The mounting holes can also be arranged at a very close distance from each other. By means of a separation process, the superfluous material can be separated from the high-pressure fuel accumulator at low cost, thereby minimizing the weight of the high-pressure fuel accumulator.

Claims

Patentansprüche claims 1. Verfahren zur Herstellung eines Kraftstoffhochdruckspeichers (1) für ein Kraftstoffeinspritzsystem einer Brenn- kraftmaschine, mit einem rohrartigen Grundkörper (2),1. Method for producing a high-pressure fuel accumulator (1) for a fuel injection system of an internal combustion engine, with a tubular base body (2), - mindestens einem Anschluss für die Kraftstoffzufuhr (3),- at least one connection for the fuel supply (3), - mindestens einem Anschluss für die Kraftstoffabfuhr (4) und - mindestens einem Befestigungselement, wobei der rohrartige Grundkörper (2) mit den Anschlüssen (3) (4) und dem Befestigungselement einstückig ausgebildet ist, dadurch gekennzeichnet, dass - ein Hohlprofil des rohrartige Grundkörper (2) mit mindestens einer Anschlussleiste (5) (6) und/oder einer Befestigungsleiste (7) profilstranggepresst wird.- at least one connection for the fuel discharge (4) and - at least one fastening element, the tubular base body (2) being formed in one piece with the connections (3) (4) and the fastening element, characterized in that - a hollow profile of the tubular base body ( 2) is extruded with at least one connecting bar (5) (6) and / or a fastening bar (7). 2. Verfahren zur Herstellung eines Kraftstoffhochdruckspei- chers (1) nach Anspruch 1, dadurch gekennzeichnet, dass durch ein Trennverfahren aus der Anschlussleiste (5) (6) überflüssiges Material herausgetrennt wird und einzelne Anschlussstutzen (9) stehen bleiben/oder durch ein Trennverfahren aus der Befestigungsleiste (7) überflüssiges Material herausgetrennt wird und einzelne Befestigungselemente stehen bleiben.2. A method for producing a high-pressure fuel accumulator (1) according to claim 1, characterized in that by a separation process from the terminal block (5) (6) excess material is separated and individual connection pieces (9) remain / or by a separation process unnecessary material is removed from the fastening strip (7) and individual fastening elements remain. 3. Verfahren zur Herstellung eines Kraftstoffhochdruckspei- chers (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass durch eine Kaltumformung des Kraftstoffhochdruckspeichers eine Verfestigung der Oberfläche erzielt wird. 3. A method for producing a high-pressure fuel reservoir (1) according to one of the preceding claims, characterized in that the surface is solidified by cold forming of the high-pressure fuel reservoir.
EP03785495A 2002-12-04 2003-11-05 Method for producing high pressure fuel accumulators Expired - Lifetime 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)

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

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

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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

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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
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DE50304307D1 (en) 2006-08-31
DE10256703B3 (en) 2004-04-01
EP1570172B1 (en) 2006-07-19
JP2006509144A (en) 2006-03-16
US20060053626A1 (en) 2006-03-16
WO2004051075A1 (en) 2004-06-17

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