EP2687302A1 - Method for producing a high pressure fuel line - Google Patents

Method for producing a high pressure fuel line Download PDF

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Publication number
EP2687302A1
EP2687302A1 EP13171023.8A EP13171023A EP2687302A1 EP 2687302 A1 EP2687302 A1 EP 2687302A1 EP 13171023 A EP13171023 A EP 13171023A EP 2687302 A1 EP2687302 A1 EP 2687302A1
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EP
European Patent Office
Prior art keywords
receiving portion
holder
fuel line
pressure fuel
tube
Prior art date
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Granted
Application number
EP13171023.8A
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German (de)
French (fr)
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EP2687302B1 (en
Inventor
Stefan Mehring
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.)
Benteler Automobiltechnik GmbH
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Benteler Automobiltechnik GmbH
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Publication of EP2687302A1 publication Critical patent/EP2687302A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles
    • B21K23/04—Making other articles flanged articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/063—Making machine elements axles or shafts hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/16—Remodelling hollow bodies with respect to the shape of the cross-section
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

Definitions

  • the present invention relates to a method for producing a high pressure fuel line according to the features in claim 1.
  • Object of the present invention is therefore to provide a method by which a high-pressure fuel line is inexpensive and easy to produce, which has a structurally simple and durable connection possibility to a holder.
  • a high-pressure fuel line is provided, which is coupled in particular as a direct high-pressure fuel line to an internal combustion engine via a holder with this.
  • supply lines and / or discharge lines can then run out of the high-pressure fuel line, supplying fuel to associated fuel injectors via a high-pressure.
  • a pipe is provided, which is a pipe that can withstand the expected pressures of up to more than 200 MPa without bursting or suffering any other damage.
  • This can be a seamless tube or else a longitudinally welded tube.
  • the tube has, in particular, a length between 10 and 100 cm, very particularly preferably between 10 and 70 cm, so that it can be mounted in the region of a cylinder head of an internal combustion engine and brought into connection with fuel injectors.
  • the pipe provided is machined in its longitudinal direction at least in sections according to the invention by a Stauchrundknetvorgang so that its outer diameter is increased to produce a receiving portion.
  • this can be an enlargement of the outside diameter at a substantially constant wall thickness or, alternatively, an increase in the wall thickness with a constant inside diameter, so that the outside diameter increases as a result.
  • a holder with an opening is pressed onto the receiving portion, so that a positive connection between the holder and the receiving portion is made.
  • the holder itself is then in turn used to establish a fixed distance to an internal combustion engine and to be positively coupled at a free end to the internal combustion engine.
  • the holder is most preferably a metallic holder made by a casting process, ie a casting holder.
  • the upsetting round-kneading method according to the invention is preferably carried out on a upsetting round kneading apparatus such that radially circumferentially distributed upset kneading tools are moved forwards and backwards in a pulsating manner in the radial direction to a common center of which enclosed tube is formed by forming technology.
  • the tube is thereby pushed even in its longitudinal direction pulsating or continuously through the Stauchrundknetvoriques through, wherein in particular in the context of the invention, a counter-mandrel and an inner mandrel are disposed within the tube.
  • the outer circumferential surface of the receiving portion is formed as a polygon and / or toothing.
  • a polygon In the case of a polygon, it is an outer circumferential surface in the form of a polygon, wherein the contour of the polygon is also introduced by the Stauchrundknettechnikmaschine. For example, a 12-, 20- or 30-sided polygon is formed, wherein the respective corners are connected to each other by flat sections.
  • the upset circular kneading process hereby makes possible the largely free design of the outer circumferential surface of the receiving section with respect to a substantially circular outer circumferential surface of the starting tube.
  • toothing In the case of a toothing is a corresponding outer profiling, which is applied to the receiving portion by the Stauchrundknetvorgang. In the context of the invention, however, it is also possible to interlock the surface again on the polygon section.
  • the tube is heated in sections, preferably at the longitudinal section, which is formed into the receiving section, in particular by an induction coil.
  • the induction coil is in particular connected upstream of the upset circular kneading process in the direction of insertion of the tube, so that when passing the section which is to be formed into a receiving section, local heating by the induction coil can be brought about. This creates an area with a reduced yield stress, which favors the subsequent upsetting rounding process.
  • the heating takes place at a temperature between 50 and 200 degrees Celsius, wherein a yield stress between 200 and 400 MPa, in particular between 250 and 350 MPa and particularly preferably of about 300 MPa is generated.
  • a steel material is used, especially the steel material 1.4301 or 1.4307.
  • the further provided holder in particular the Gußhalter, when pressing the Gußhalters an oversize, thus a press fit.
  • a polygonal receiving portion of the outer diameter is chosen in particular such that it includes a circle as the corners of the polygon.
  • the receiving portion is thermally joined to the Gußhalter, preferably by a soldering process.
  • a holder with particularly high strength is provided, which produces a secure and durable connection by the positive fit of the interference fit, on the other hand by the material bond of the thermal joining process, in particular the soldering process.
  • Such a connection is insensitive to the pressure pulsations occurring in the high-pressure fuel line.
  • At least one intermediate space is formed between an inner lateral surface of the opening of the holder and the outer lateral surface of the receiving section, wherein the solder of the soldering process flows into the intermediate space and produces a material connection between inner lateral surface and outer lateral surface.
  • the intermediate space is repeatedly formed, in particular when the receiving section is designed as a polygon and corresponding circular inner lateral surface of the holder, so that solder can flow radially in the intermediate spaces.
  • the holder for example, by thermal treatment on the receiving portion.
  • the holder is heated at least in the region of the opening, so that it widens and cools down after being placed on the receiving portion, so that the interference fit is produced.
  • a radius is formed particularly preferably in a transition between outer circumferential surface of the tube and outer lateral surface of the receiving section, or a flowing transition is formed, so that here a reduction of the locally occurring voltage peaks occurs.
  • the outer circumferential surface between the receiving portion and the tube is thus more durable against the formation of microcracks formed as is the case with an outer circumferential surface, which experiences a sudden change in the outer radius.
  • the high-pressure fuel line thus produced can then be coupled with other attachments.
  • the fuel line can be soldered to the fuel line, which are used for coupling with a fuel injector within the scope of the invention.
  • FIG. 1 shows a high-pressure fuel line 1 according to the invention, wherein the fuel line is formed from a fuel pipe 2 and formed on the fuel pipe 2 connecting piece 3 for coupling with injectors not shown. Further, the fuel pipe 2 has a return pipe 4, flows back through the unused fuel to a fuel tank, not shown. Also, an inlet port 5 is formed, which is connectable to a fuel line not shown for supplying the fuel. On the fuel pipe 2 holders 6 are mounted according to the invention, which are coupled by means of mounting holes 7 on a cylinder head of an internal combustion engine, not shown.
  • FIG. 2 shows a perspective view of the fuel pipe 2 according to the invention, wherein the fuel pipe 2 in its longitudinal direction 8 has a longitudinal portion 9 which is formed enlarged in its outer diameter D9 relative to the outer diameter D2 of the fuel pipe 2.
  • This length portion 9 is formed as a receiving portion 10, wherein the receiving portion 10 is formed in the variant shown here as a polygon.
  • a ring 11 of the holder 6 is fitted by means of an interference fit, so that a positive coupling between an inner circumferential surface 13 of an opening 12 of the ring 11 and an outer circumferential surface 14 of the receiving portion is formed.
  • FIG. 3 shows a cross section along the section line III-III FIG. 2 , wherein it can be seen here that the inner circumferential surface 13 of the ring 11 is positively coupled to the outer circumferential surface 14 of the receiving portion 10, wherein the positive connection between the inner circumferential surface 13 and the corners 15 of the polygon is formed.
  • the spaces 16 remain slot-like openings extending in the longitudinal direction.
  • this slot-like openings can flow through a non-illustrated thermal joining process, such as a soldering process, a solder, which then forms an additional material connection between outer circumferential surface 14 of the receiving portion 10 and inner circumferential surface 13 of the ring 11.
  • FIG. 4 shows in extracts an inventive manufacturing method in which the fuel pipe 2 is inserted through an induction coil 17 in an insertion direction 18 in a Stauchrundknetvorraum 19.
  • the end 20 of the fuel pipe 2 is thereby countered by a counter-holder mandrel 21 against the insertion direction 18 and by an internal mandrel 22, the tube 2 is prevented from reducing by the forming process an inner diameter Di.
  • the outer diameter of the length portion 9, which is formed into the receiving portion 10 is reduced to the outer diameter D9 by increasing the wall thickness W9 in the region of Receiving section 10 increases, compared to an outer diameter D2 of the remaining fuel pipe 2 and a wall thickness W2 also the legal fuel pipe 2.
  • the upsetting device 19 has circumferential Stauchrundknettechnik Wege 23, which are exemplified here as two tools that perform a pulsating kneading movement in the translational direction 24 ,
  • the outer diameter D9 can be widened according to the invention, but also corresponding outer circumferential surfaces 14 with profilings, for example in the form of a polygon, can be produced by the upset circular kneading process.

Abstract

The method involves providing a pipe. Outer diameter of the pipe is partially enlarged in a longitudinal direction of the pipe to manufacture a receiving portion by compression swaging, where an outer jacket surface of the receiving portion is designed as a polygon and/or a gearing. A holder (6) couplable with a high pressure fuel line (1) is pressed on the receiving portion. The pipe is partially warmed up at a length portion by an induction coil, where the length portion is transformed to the receiving portion.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Hochdruckkraftstoffleitung gemäß den Merkmalen im Patentanspruch 1.The present invention relates to a method for producing a high pressure fuel line according to the features in claim 1.

Im Stand der Technik ist es bekannt, bei Verbrennungskraftmaschinen den Kraftstoff direkt in den Verbrennungsraum einzuspritzen. Hierzu wird mit Drücken von bis zu mehr als 200 MPa der Kraftstoff über Kraftstoffinjektoren direkt in den Verbrennungsraum der Kraftmaschine eingespritzt. Solche Kraftstoffverteilersysteme werden auch Commonrail-Systeme genannt. Insbesondere finden diese Einsatz bei Dieselmotoren, zunehmend mehr jedoch auch bei Motoren, die mit Otto-Kraftstoff betrieben werden.In the prior art, it is known to inject the fuel directly into the combustion chamber in internal combustion engines. For this purpose, with pressures of up to more than 200 MPa, the fuel is injected via fuel injectors directly into the combustion chamber of the engine. Such fuel rail systems are also called common rail systems. In particular, these find use in diesel engines, but increasingly more so in engines that are operated with gasoline fuel.

Innerhalb der Leitungen herrscht somit ein Druck von bis zu mehr als 200 MPa, wobei aufgrund der Einspritzung durch die Injektoren es innerhalb der Leitung zu Druckpulsationen kommt, die an die Wandungsfläche der Leitungen sowie die Anbauteile entsprechend übertragen werden.Within the lines thus prevails a pressure of up to more than 200 MPa, which due to the injection through the injectors, there is pressure pulsations within the line, which are transmitted to the wall surface of the lines and the attachments accordingly.

An den Leitungen, insbesondere auch an den Halterungen der Leitungen, kann es somit zur Ausbildung von Mikrorissen oder sonstigen Beschädigungen kommen.On the lines, especially on the brackets of the lines, it may thus come to the formation of microcracks or other damage.

Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren bereitzustellen, mit dem eine Hochdruckkraftstoffleitung kostengünstig und einfach herstellbar ist, die eine konstruktiv einfache und langlebige Anbindungsmöglichkeit an einer Halterung aufweist.Object of the present invention is therefore to provide a method by which a high-pressure fuel line is inexpensive and easy to produce, which has a structurally simple and durable connection possibility to a holder.

Die zuvor genannte Aufgabe wird erfindungsgemäß mit einem Verfahren zur Herstellung einer Hochdruckkraftstoffleitung gemäß den Merkmalen im Patentanspruch 1 gelöst.The aforementioned object is achieved with a method for producing a high-pressure fuel line according to the features in claim 1.

Vorteilhafte Ausführungsvarianten des vorliegenden Verfahrens sind Bestandteil der abhängigen Patentansprüche.Advantageous embodiments of the present method are part of the dependent claims.

Das erfindungsgemäße Verfahren zur Herstellung einer Hochdruckkraftstoffleitung, wobei ein Halter mit der Hochdruckkraftstoffleitung gekoppelt wird, ist gekennzeichnet durch folgende Verfahrensschritte:

  • Bereitstellung eines Rohrs,
  • zumindest abschnittsweise in Längsrichtung des Rohres vergrößern des Durchmessers zur Herstellung eines Aufnahmeabschnittes durch Stauchrundkneten,
  • Aufpressen eines Halters auf den Aufnahmeabschnitt.
The method according to the invention for producing a high-pressure fuel line, wherein a holder is coupled to the high-pressure fuel line, is characterized by the following method steps:
  • Provision of a pipe,
  • at least in sections in the longitudinal direction of the tube, increase the diameter for producing a receiving section by upset kneading,
  • Pressing a holder on the receiving section.

Im Rahmen der Erfindung wird somit eine Hochdruckkraftstoffleitung bereit gestellt, die insbesondere als direkte Hochdruckkraftstoffleitung an einer Verbrennungskraftmaschine über einen Halter mit dieser gekoppelt ist. Von der Hochdruckkraftstoffleitung können im Rahmen der Erfindung dann jeweils Zu- bzw. Ableitungen ausgehen, die damit verbundene Kraftstoffinjektoren über einen Hochdruck mit Kraftstoff versorgen.In the context of the invention, therefore, a high-pressure fuel line is provided, which is coupled in particular as a direct high-pressure fuel line to an internal combustion engine via a holder with this. In the context of the invention, in each case, supply lines and / or discharge lines can then run out of the high-pressure fuel line, supplying fuel to associated fuel injectors via a high-pressure.

Zur Herstellung wird erfindungsgemäß ein Rohr bereitgestellt, bei dem es sich um ein Rohr handelt, das die zu erwartenden Drücke von bis zu mehr als 200 MPa aushält, ohne dabei zu bersten oder sonstige Beschädigungen zu erleiden. Dabei kann es sich um ein nahtloses Rohr oder aber auch um ein längsnahtgeschweißtes Rohr handeln.For the production according to the invention, a pipe is provided, which is a pipe that can withstand the expected pressures of up to more than 200 MPa without bursting or suffering any other damage. This can be a seamless tube or else a longitudinally welded tube.

Das Rohr weist insbesondere eine Länge zwischen 10 und 100 cm, ganz besonders bevorzugt zwischen 10 und 70 cm auf, so dass es im Bereich eines Zylinderkopfes eines Verbrennungsmotors montierbar ist und in Verbindung mit Kraftstoffinjektoren gebracht wird.The tube has, in particular, a length between 10 and 100 cm, very particularly preferably between 10 and 70 cm, so that it can be mounted in the region of a cylinder head of an internal combustion engine and brought into connection with fuel injectors.

Das bereitgestellte Rohr wird in seiner Längsrichtung zumindest abschnittsweise erfindungsgemäß durch einen Stauchrundknetvorgang bearbeitet, so dass sein Außendurchmesser zur Herstellung eines Aufnahmeabschnittes vergrößert wird. Dabei kann es sich im Rahmen der Erfindung um ein Vergrößern des Außendurchmessers bei im Wesentlichem gleichbleibender Wandstärke handeln oder aber auch alternativ um ein Erhöhen der Wandstärke bei gleichbleibendem Innendurchmesser, so dass sich hierdurch der Außendurchmesser erhöht.The pipe provided is machined in its longitudinal direction at least in sections according to the invention by a Stauchrundknetvorgang so that its outer diameter is increased to produce a receiving portion. In the context of the invention, this can be an enlargement of the outside diameter at a substantially constant wall thickness or, alternatively, an increase in the wall thickness with a constant inside diameter, so that the outside diameter increases as a result.

Im Anschluss daran wird auf den Aufnahmeabschnitt ein Halter mit einer Öffnung aufgepresst, so dass eine formschlüssige Verbindung zwischen Halter und Aufnahmeabschnitt hergestellt ist. Der Halter selbst wird dann wiederum dazu genutzt, einen festen Abstand zu einer Verbrennungskraftmaschine herzustellen und an einem freien Ende mit der Verbrennungskraftmaschine formschlüssig gekoppelt zu werden. Bei dem Halter handelt es sich ganz besonders bevorzugt um einen metallischen Halter, der durch ein Gießverfahren hergestellt ist, mithin um einen Gußhalter.Subsequently, a holder with an opening is pressed onto the receiving portion, so that a positive connection between the holder and the receiving portion is made. The holder itself is then in turn used to establish a fixed distance to an internal combustion engine and to be positively coupled at a free end to the internal combustion engine. The holder is most preferably a metallic holder made by a casting process, ie a casting holder.

Das erfindungsgemäße Stauchrundknetverfahren wird bevorzugt auf einer Stauchrundknetvorrichtung derart durchgeführt, dass radial umlaufend verteilte Stauchrundknetwerkzeuge pulsierend in Radialrichtung zu einem gemeinsamen Mittelpunkt vor und zurück bewegt werden, wobei das radial davon umschlossene Rohr umformtechnisch bearbeitet wird. Das Rohr wird dabei selbst in seiner Längsrichtung pulsierend oder aber kontinuierlich durch die Stauchrundknetvorrichtung hindurch geschoben, wobei insbesondere im Rahmen der Erfindung ein Gegenhalterdorn sowie ein Innendorn innerhalb des Rohres angeordnet sind. Aufgrund des Gegenhalterdorns erfolgt eine derartige Stauchung, dass ein Fließen des Materials derart herbeigeführt wird, dass sich die Wandstärke lokal erhöht und sich der Außendurchmesser vergrößert und/oder dass sich der Außendurchmesser vergrößert bei im Wesentlich gleichbleibender Wandstärke. Weiterhin bevorzugt wird die Außenmantelfläche des Aufnahmeabschnittes als Polygon und/oder Verzahnung ausgebildet.The upsetting round-kneading method according to the invention is preferably carried out on a upsetting round kneading apparatus such that radially circumferentially distributed upset kneading tools are moved forwards and backwards in a pulsating manner in the radial direction to a common center of which enclosed tube is formed by forming technology. The tube is thereby pushed even in its longitudinal direction pulsating or continuously through the Stauchrundknetvorrichtung through, wherein in particular in the context of the invention, a counter-mandrel and an inner mandrel are disposed within the tube. Due to the counter-holder mandrel, such a compression takes place that a flow of the material is brought about in such a way that the wall thickness increases locally and the outside diameter increases and / or that the outside diameter increases while the wall thickness remains substantially constant. Further preferably, the outer circumferential surface of the receiving portion is formed as a polygon and / or toothing.

Im Falle eines Polygons handelt es sich um eine Außenmantelfläche in Form eines Vieleckes, wobei die Kontur des Vieleckes ebenfalls durch das Stauchrundknetwerkzeug eingebracht wird. Beispielsweise wird ein 12-, 20-oder aber 30- seitiges Vieleck ausgebildet, wobei die jeweiligen Ecken durch flächige Abschnitte miteinander verbunden sind. Gerade der Stauchrundknetprozess ermöglicht hierbei die weitestgehend freie Gestaltung der Außenmantelfläche des Aufnahmeabschnittes gegenüber einer im Wesentlichen kreisrunden Außenmantelfläche des Ausgangsrohres.In the case of a polygon, it is an outer circumferential surface in the form of a polygon, wherein the contour of the polygon is also introduced by the Stauchrundknetwerkzeug. For example, a 12-, 20- or 30-sided polygon is formed, wherein the respective corners are connected to each other by flat sections. In particular, the upset circular kneading process hereby makes possible the largely free design of the outer circumferential surface of the receiving section with respect to a substantially circular outer circumferential surface of the starting tube.

Im Falle einer Verzahnung handelt es sich um eine entsprechende Außenprofilierung, die auf den Aufnahmeabschnitt durch den Stauchrundknetvorgang aufgebracht wird. Im Rahmen der Erfindung ist es jedoch auch möglich, auf dem Polygonabschnitt jeweils die Oberfläche nochmals zu verzahnen.In the case of a toothing is a corresponding outer profiling, which is applied to the receiving portion by the Stauchrundknetvorgang. In the context of the invention, however, it is also possible to interlock the surface again on the polygon section.

Weiterhin besonders bevorzugt wird das Rohr abschnittsweise, vorzugsweise an dem Längenabschnitt, der zu dem Aufnahmeabschnitt umgeformt wird, erwärmt, insbesondere durch eine Induktionsspule. Die Induktionsspule ist insbesondere dem Stauchrundknetvorgang in Einschubrichtung des Rohres vorgeschaltet, so dass bei Passieren des Abschnittes, der zu einem Aufnahmeabschnitt umgeformt werden soll, eine lokale Erwärmung durch die Induktionsspule herbeigeführt werden kann. Hierdurch entsteht ein Bereich mit einer verringerten Fließspannung, was den nachfolgenden Stauchrundknetvorgang begünstigt.Further particularly preferably, the tube is heated in sections, preferably at the longitudinal section, which is formed into the receiving section, in particular by an induction coil. The induction coil is in particular connected upstream of the upset circular kneading process in the direction of insertion of the tube, so that when passing the section which is to be formed into a receiving section, local heating by the induction coil can be brought about. This creates an area with a reduced yield stress, which favors the subsequent upsetting rounding process.

Im Rahmen der Erfindung ist es ebenfalls möglich, das gesamte Rohr nach Abschluss des Stauchrundknetvorganges vollständig zu vergüten, beispielsweise vollständig wärmezubehandeln, so dass ein gleichmäßiger Spannungszustand innerhalb des Werkstoffes des gesamten Rohres hergestellt ist.In the context of the invention, it is also possible to completely compensate the entire tube after completion of the Stauchrundknetvorganges, for example, completely heat treat, so that a uniform state of stress is produced within the material of the entire tube.

Insbesondere findet die Erwärmung auf eine Temperatur zwischen 50 und 200 Grad Celsius statt, wobei eine Fließspannung zwischen 200 und 400 MPa, insbesondere zwischen 250 und 350 MPa und besonders bevorzugt von ca. 300 MPa erzeugt wird. Insbesondere wird ein Stahlwerkstoff verwendet, ganz besonders der Stahlwerkstoff 1.4301 oder 1.4307.In particular, the heating takes place at a temperature between 50 and 200 degrees Celsius, wherein a yield stress between 200 and 400 MPa, in particular between 250 and 350 MPa and particularly preferably of about 300 MPa is generated. In particular, a steel material is used, especially the steel material 1.4301 or 1.4307.

Durch die zumindest lokale Aufdickung des Aufnahmeabschnittes wird mit dem weiterhin bereitgestellten Halter, insbesondere dem Gußhalter, bei Aufpressen des Gußhalters eine Übermaßpassung, mithin eine Presspassung, hergestellt. Dies bedeutet, dass eine Innenmantelfläche des Halters immer, auch unter Berücksichtigung der Produktionstoleranzen, einen kleineren Durchmesser aufweist als die Außenmantelfläche des Aufnahmeabschnittes. Im Falle eines mehreckigen Aufnahmeabschnittes wird der Außendurchmesser insbesondere derart gewählt, dass er als Kreis die Ecken des Vieleckes einschließt. Hierdurch wird dann eine Übermaßpassung zwischen den im Wesentlichen Ecken des Vieleckes sowie der Innenmantelfläche des Gußhalters hergestellt.Due to the at least local thickening of the receiving portion is made with the further provided holder, in particular the Gußhalter, when pressing the Gußhalters an oversize, thus a press fit. This means that an inner lateral surface of the holder always, even taking into account the production tolerances, a smaller diameter than the outer circumferential surface of the receiving portion. In the case of a polygonal receiving portion of the outer diameter is chosen in particular such that it includes a circle as the corners of the polygon. As a result, an interference fit between the substantially corners of the polygon and the inner circumferential surface of the casting holder is then produced.

Weiterhin bevorzugt wird der Aufnahmeabschnitt mit dem Gußhalter thermisch gefügt, vorzugsweise durch ein Lötverfahren. Mithin wird eine Halterung mit besonders hoher Festigkeit bereitgestellt, die zum einen durch den Formschluss der Übermaßpassung, zum anderen durch den Stoffschluss des thermischen Fügeverfahrens, insbesondere des Lötverfahrens, eine sichere und dauerhaltbare Verbindung herstellt. Eine solche Verbindung ist unempfindlich gegenüber den in der Hochdruckkraftstoffleitung auftretenden Druckpulsationen.Further preferably, the receiving portion is thermally joined to the Gußhalter, preferably by a soldering process. Thus, a holder with particularly high strength is provided, which produces a secure and durable connection by the positive fit of the interference fit, on the other hand by the material bond of the thermal joining process, in particular the soldering process. Such a connection is insensitive to the pressure pulsations occurring in the high-pressure fuel line.

Weiterhin besonders bevorzugt ist zwischen einer Innenmantelfläche der Öffnung des Halters und der Außenmantelfläche des Aufnahmeabschnittes mindestens ein Zwischenraum ausgebildet, wobei das Lot des Lötverfahrens in den Zwischenraum fließt und hier einen Stoffschluss zwischen Innenmantelfläche und Außenmantelfläche herstellt. Im Rahmen der Erfindung wird der Zwischenraum insbesondere bei Ausbildung des Aufnahmeabschnittes als Polygon und dazu korrespondierender kreisrunder Innenmantelfläche des Halters mehrfach ausgebildet, so dass radial umlaufend Lot in die Zwischenräume fließen kann.Furthermore, particularly preferably, at least one intermediate space is formed between an inner lateral surface of the opening of the holder and the outer lateral surface of the receiving section, wherein the solder of the soldering process flows into the intermediate space and produces a material connection between inner lateral surface and outer lateral surface. In the context of the invention, the intermediate space is repeatedly formed, in particular when the receiving section is designed as a polygon and corresponding circular inner lateral surface of the holder, so that solder can flow radially in the intermediate spaces.

Im Rahmen der Erfindung ist es ebenfalls möglich, den Halter beispielsweise durch thermische Behandlung auf den Aufnahmeabschnitt aufzuschrumpfen. Hierbei wird der Halter zumindest im Bereich der Öffnung erwärmt, so dass er sich weitet und nach Aufsetzen auf den Aufnahmeabschnitt abkühlt, so dass die Übermaßpassung hergestellt wird.In the context of the invention, it is also possible to shrink the holder, for example, by thermal treatment on the receiving portion. In this case, the holder is heated at least in the region of the opening, so that it widens and cools down after being placed on the receiving portion, so that the interference fit is produced.

Weiterhin wird besonders bevorzugt im Rahmen der Erfindung in einem Übergang zwischen Außenmantelfläche des Rohres und Außenmantelfläche des Aufnahmeabschnittes ein Radius ausgebildet, bzw. ein fließender Übergang ausgebildet, so dass es hier zu einer Verringerung der lokal auftretenden Spannungsspitzen kommt. Die Außenmantelfläche zwischen Aufnahmeabschnitt und Rohr ist somit dauerhaltbarer gegenüber der Bildung von Mikrorissen ausgebildet als es bei einer Außenmantelfläche der Fall ist, die sprungartig eine Änderung des Außenradius erfährt.Furthermore, in the context of the invention, a radius is formed particularly preferably in a transition between outer circumferential surface of the tube and outer lateral surface of the receiving section, or a flowing transition is formed, so that here a reduction of the locally occurring voltage peaks occurs. The outer circumferential surface between the receiving portion and the tube is thus more durable against the formation of microcracks formed as is the case with an outer circumferential surface, which experiences a sudden change in the outer radius.

Im Rahmen der Erfindung kann die so hergestellte Hochdruckkraftstoffleitung dann mit weiteren Anbauteilen gekoppelt werden. Beispielsweise können im Rahmen der Erfindung dann Anschlussstutzen an die Kraftstoffleitung gelötet werden, die zur Koppelung mit einem Kraftstoffinjektor verwendet werden.In the context of the invention, the high-pressure fuel line thus produced can then be coupled with other attachments. For example, can be soldered to the fuel line, which are used for coupling with a fuel injector within the scope of the invention.

Die zuvor genannten Verfahrensschritte sind im Rahmen der Erfindung beliebig untereinander kombinierbar, mit den damit einhergehenden Vorteilen.The aforementioned method steps can be combined with one another in the context of the invention as desired, with the associated advantages.

Weitere Vorteile, Merkmale, Eigenschaften und Aspekte der vorliegenden Erfindung sind Bestandteil der nachfolgenden Beschreibung. Bevorzugte Ausführungsvarianten werden in den schematischen Figuren dargestellt. Diese dienen dem einfachen Verständnis der Erfindung. Es zeigen:

Figur 1
eine erfindungsgemäße Hochdruckkraftstoffleitung in einer perspektivischen Ansicht,
Figur 2
einen Längenabschnitt einer erfindungsgemäßen Hochdruckkraftstoffleitung mit Aufnahmeabschnitt,
Figur 3
einen Querschnitt durch die Hochdruckkraftstoffleitung gemäß Schnittline III-III und
Figur 4
einen Querschnitt durch ein erfindungsgemäßes Hochdruckkraftstoffrohr während der Herstellung.
Further advantages, features, characteristics and aspects of the present invention are part of the following description. Preferred embodiments are shown in the schematic figures. These are for easy understanding of the invention. Show it:
FIG. 1
a high-pressure fuel line according to the invention in a perspective view,
FIG. 2
a longitudinal section of a high-pressure fuel line according to the invention with a receiving section,
FIG. 3
a cross section through the high pressure fuel line according to Schnittline III-III and
FIG. 4
a cross section through an inventive high-pressure fuel pipe during manufacture.

In den Figuren werden für gleiche oder ähnliche Bauteile dieselben Bezugszeichen verwendet, auch wenn eine wiederholte Beschreibung aus Vereinfachungsgründen entfällt.In the figures, the same reference numerals are used for the same or similar components, even if a repeated description is omitted for reasons of simplicity.

Figur 1 zeigt eine erfindungsgemäße Hochdruckkraftstoffleitung 1, wobei die Kraftstoffleitung aus einem Kraftstoffrohr 2 sowie an dem Kraftstoffrohr 2 ausgebildeten Anschlussstutzen 3 zur Koppelung mit nicht näher dargestellten Injektoren ausgebildet ist. Ferner weist das Kraftstoffrohr 2 einen Rücklaufstutzen 4 auf, durch den nicht verwendeter Kraftstoff zu einem nicht näher dargestellten Kraftstofftank zurückfließt. Ebenfalls ist ein Einlassstutzen 5 ausgebildet, der mit einer nicht näher dargestellten Kraftstoffleitung zur Zuführung des Kraftstoffes verbindbar ist. An dem Kraftstoffrohr 2 sind erfindungsgemäß Halter 6 angebracht, die mittels Montageöffnungen 7 an einem Zylinderkopf einer nicht näher dargestellten Verbrennungskraftmaschine gekoppelt werden. FIG. 1 shows a high-pressure fuel line 1 according to the invention, wherein the fuel line is formed from a fuel pipe 2 and formed on the fuel pipe 2 connecting piece 3 for coupling with injectors not shown. Further, the fuel pipe 2 has a return pipe 4, flows back through the unused fuel to a fuel tank, not shown. Also, an inlet port 5 is formed, which is connectable to a fuel line not shown for supplying the fuel. On the fuel pipe 2 holders 6 are mounted according to the invention, which are coupled by means of mounting holes 7 on a cylinder head of an internal combustion engine, not shown.

Figur 2 zeigt eine perspektivische Ansicht des erfindungsgemäßen Kraftstoffrohrs 2, wobei das Kraftstoffrohr 2 in seiner Längsrichtung 8 einen Längenabschnitt 9 aufweist, der in seinem Außendurchmesser D9 gegenüber dem Außendurchmesser D2 des Kraftstoffrohres 2 vergrößert ausgebildet ist. Dieser Längenabschnitt 9 ist als Aufnahmeabschnitt 10 ausgebildet, wobei der Aufnahmeabschnitt 10 in der hier dargestellten Variante als Polygon ausgebildet ist. Auf dem Aufnahmeabschnitt 10 ist ein Ring 11 des Halters 6 mittels einer Übermaßpassung aufgesetzt, so dass eine formschlüssige Koppelung zwischen einer Innenmantelfläche 13 einer Öffnung 12 des Ringes 11 und einer Außenmantelfläche 14 des Aufnahmeabschnittes ausgebildet wird. FIG. 2 shows a perspective view of the fuel pipe 2 according to the invention, wherein the fuel pipe 2 in its longitudinal direction 8 has a longitudinal portion 9 which is formed enlarged in its outer diameter D9 relative to the outer diameter D2 of the fuel pipe 2. This length portion 9 is formed as a receiving portion 10, wherein the receiving portion 10 is formed in the variant shown here as a polygon. On the receiving portion 10, a ring 11 of the holder 6 is fitted by means of an interference fit, so that a positive coupling between an inner circumferential surface 13 of an opening 12 of the ring 11 and an outer circumferential surface 14 of the receiving portion is formed.

Figur 3 zeigt einen Querschnitt entlang der Schnittlinie III-III aus Figur 2, wobei hier zu erkennen ist, dass die Innenmantelfläche 13 des Ringes 11 mit der Außenmantelfläche 14 des Aufnahmeabschnittes 10 formschlüssig gekoppelt ist, wobei der Formschluss zwischen Innenmantelfläche 13 sowie den Ecken 15 des Polygons ausgebildet ist. In den Zwischenräumen 16 verbleiben schlitzartige Öffnungen, die sich in Längsrichtung erstrecken. In diese schlitzartigen Öffnungen kann durch einen nicht näher dargestellten thermischen Fügeprozess, beispielsweise ein Lötverfahren, ein Lot einfließen, das dann einen zusätzlichen Stoffschluss zwischen Außenmantelfläche 14 des Aufnahmeabschnittes 10 und Innenmantelfläche 13 des Ringes 11 ausbildet. FIG. 3 shows a cross section along the section line III-III FIG. 2 , wherein it can be seen here that the inner circumferential surface 13 of the ring 11 is positively coupled to the outer circumferential surface 14 of the receiving portion 10, wherein the positive connection between the inner circumferential surface 13 and the corners 15 of the polygon is formed. In the spaces 16 remain slot-like openings extending in the longitudinal direction. In this slot-like openings can flow through a non-illustrated thermal joining process, such as a soldering process, a solder, which then forms an additional material connection between outer circumferential surface 14 of the receiving portion 10 and inner circumferential surface 13 of the ring 11.

Figur 4 zeigt auszugsweise ein erfindungsgemäßes Herstellungsverfahren, bei dem das Kraftstoffrohr 2 durch eine Induktionsspule 17 hindurch in einer Einschubrichtung 18 in eine Stauchrundknetvorrichtung 19 eingeführt wird. Das Ende 20 des Kraftstoffrohrs 2 wird dabei durch einen Gegenhalterdorn 21 entgegen der Einschubrichtung 18 gekontert und durch einen Innendorn 22 wird das Rohr 2 daran gehindert, durch den Umformprozess einen Innendurchmesser Di zu verringern. Der Außendurchmesser des Längenabschnittes 9, der zu dem Aufnahmeabschnitt 10 umgeformt wird, wird auf den Außendurchmesser D9 durch Vergrößerung der Wandstärke W9 im Bereich des Aufnahmeabschnittes 10 vergrößert, gegenüber einem Außendurchmesser D2 des restlichen Kraftstoffrohres 2 und einer Wandstärke W2 ebenfalls des rechtlichen Kraftstoffrohres 2. Die Stauchrundknetvorrichtung 19 weist dazu umlaufende Stauchrundknetwerkzeuge 23 auf, die hier exemplarisch als zwei Werkzeuge dargestellt sind, die eine pulsierende Knetbewegung in translatorischer Richtung 24 durchführen. Dabei kann erfindungsgemäß nicht nur der Außendurchmesser D9 aufgeweitet werden, sondern es können auch entsprechende Außenmantelflächen 14 mit Profilierungen, beispielsweise in Form eines Polygons, durch den Stauchrundknetvorgang hergestellt werden. FIG. 4 shows in extracts an inventive manufacturing method in which the fuel pipe 2 is inserted through an induction coil 17 in an insertion direction 18 in a Stauchrundknetvorrichtung 19. The end 20 of the fuel pipe 2 is thereby countered by a counter-holder mandrel 21 against the insertion direction 18 and by an internal mandrel 22, the tube 2 is prevented from reducing by the forming process an inner diameter Di. The outer diameter of the length portion 9, which is formed into the receiving portion 10, is reduced to the outer diameter D9 by increasing the wall thickness W9 in the region of Receiving section 10 increases, compared to an outer diameter D2 of the remaining fuel pipe 2 and a wall thickness W2 also the legal fuel pipe 2. The upsetting device 19 has circumferential Stauchrundknetwerkzeuge 23, which are exemplified here as two tools that perform a pulsating kneading movement in the translational direction 24 , In this case, not only the outer diameter D9 can be widened according to the invention, but also corresponding outer circumferential surfaces 14 with profilings, for example in the form of a polygon, can be produced by the upset circular kneading process.

Weiterhin ist in Figur 4 zu erkennen, dass in einem Übergangsbereich Ü ein Radius ausgebildet ist, so dass vom Außendurchmesser D2 zu dem Außendurchmesser D9 ein fließender Übergang erfolgt, der im Falle von auftretenden Spannungen innerhalb der Wandstärke W des Rohres 2 zu einem Spannungsspitzenabbau führt.Furthermore, in FIG. 4 to recognize that in a transition region Ü a radius is formed so that from the outer diameter D2 to the outer diameter D9, a flowing transition takes place, which leads in the case of occurring stresses within the wall thickness W of the tube 2 to a voltage peak degradation.

Bezugszeichen:Reference numerals:

1 -1 -
HochdruckkraftstoffleitungHigh-pressure fuel line
2 -2 -
KraftstoffrohrFuel pipe
3 -3 -
Anschlussstutzenspigot
4 -4 -
RücklaufstutzenReturn connectors
5 -5 -
Einlassstutzeninlet port
6 -6 -
Halterholder
7 -7 -
Montageöffnungmounting hole
8 -8th -
Längsrichtung zu 2Longitudinal direction to 2
9 -9 -
Längenabschnittlongitudinal section
10 -10 -
Aufnahmeabschnittreceiving portion
11 -11 -
Ring zu 6Ring to 6
12 -12 -
Öffnung zu 11Opening to 11
13 -13 -
Innenmantelfläche zu 12Inner lateral surface to 12
14 -14 -
Außenmantelfläche zu 10Outer circumferential surface to 10
15 -15 -
Eckecorner
16 -16 -
Zwischenraumgap
17 -17 -
Induktionsspuleinduction coil
18 -18 -
Einschubrichtunginsertion direction
19 -19 -
StauchrundknetvorrichtungStauchrundknetvorrichtung
20 -20 -
Ende zu 2End to 2
21 -21 -
GegenhalterdornBackstop Dorn
22 -22 -
Innendorninner mandrel
23 -23 -
StauchrundknetwerkzeugStauchrundknetwerkzeug
24 -24 -
translatorische Richtungtranslational direction
W2 -W2 -
Wandstärke zu 2Wall thickness to 2
W9 -W9 -
Wandstärke zu 9Wall thickness to 9
D2 -D2 -
Außendurchmesser zu 2Outside diameter to 2
D9 -D9 -
Außendurchmesser zu 9Outside diameter to 9
Di -Di -
InnendurchmesserInner diameter
Ü -Ü -
ÜbergangsbereichTransition area

Claims (9)

Verfahren zur Herstellung einer Hochdruckkraftstoffleitung (1), wobei ein Halter (6) mit der Hochdruckkraftstoffleitung (1) gekoppelt wird, gekennzeichnet, durch folgende Verfahrensschritte: - Bereitstellen eines Rohrs, - Zumindest abschnittsweises in Längsrichtung des Rohres Vergrößern des Außendurchmessers (14) zur Herstellung eines Aufnahmeabschnittes (10) durch Stauchrundkneten, - Aufpressen eines Halters (6) auf den Aufnahmeabschnitt (10). Method for producing a high-pressure fuel line (1), wherein a holder (6) is coupled to the high-pressure fuel line (1), characterized by the following method steps: Providing a pipe, - At least in sections in the longitudinal direction of the tube enlarging the outer diameter (14) for producing a receiving portion (10) by upset kneading, - Pressing a holder (6) on the receiving portion (10). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in dem Aufnahmeabschnitt (10) die Wandstärke (W9) aufgedickt wird oder der Außendurchmesser (D9) bei im Wesentlichen gleichbleibender Wandstärke vergrößert wird.A method according to claim 1, characterized in that in the receiving portion (10), the wall thickness (W9) is thickened or the outer diameter (D9) is increased at a substantially constant wall thickness. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Außenmantelfläche (14) des Aufnahmeabschnitts (10) als Polygon und/oder Verzahnung ausgebildet wird.A method according to claim 1 or 2, characterized in that the outer circumferential surface (14) of the receiving portion (10) is formed as a polygon and / or toothing. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Rohr abschnittsweise, vorzugsweise an dem Längenabschnitt (9), der zu dem Aufnahmeabschnitt (10) umgeformt wird, erwärmt wird, insbesondere durch eine Induktionsspule (17).Method according to one of the preceding claims, characterized in that the tube is heated in sections, preferably at the longitudinal section (9), which is formed to the receiving portion (10), in particular by an induction coil (17). Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass eine Erwärmung auf eine Temperatur zwischen 50 und 200 Grad Celsius vorgenommen wird.A method according to claim 4, characterized in that a heating to a temperature between 50 and 200 degrees Celsius is made. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass zwischen dem Halter (6) und dem Aufnahmeabschnitt (10) eine Übermaßpassung ausgebildet wird, wobei der Halter (6) mit einer Öffnung (12) auf den Aufnahmeabschnitt (10) aufgepresst wird.Method according to one of the preceding claims, characterized in that between the holder (6) and the receiving portion (10) an interference fit is formed, wherein the holder (6) with an opening (12) is pressed onto the receiving portion (10). Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Halter (6) mit dem Aufnahmeabschnitt (10) thermisch gefügt wird, vorzugsweise durch ein Lötverfahren.Method according to one of the preceding claims, characterized in that the holder (6) with the receiving portion (10) is thermally joined, preferably by a soldering process. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass zwischen einer Innenmantelfläche (13) der Öffnung (12) und der Außenmantelfläche (14) des Aufnahmeabschnittes (10) mindestens ein Zwischenraum (16) verbleibt, wobei insbesondere Lot in den Zwischenraum (16) fließt.Method according to one of the preceding claims, characterized in that between an inner lateral surface (13) of the opening (12) and the outer lateral surface (14) of the receiving portion (10) at least one intermediate space (16) remains, in particular solder in the intermediate space (16) flows. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass in einem Übergang zwischen Rohr und Aufnahmeabschnitt (10) ein Radius ausgebildet wird.Method according to one of the preceding claims, characterized in that a radius is formed in a transition between tube and receiving portion (10).
EP13171023.8A 2012-07-20 2013-06-07 Method for producing a high pressure fuel line Not-in-force EP2687302B1 (en)

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