EP1137879B1 - Method for machining a high pressure fuel accumulator, high pressure fuel accumulator and connector branches for using said method - Google Patents

Method for machining a high pressure fuel accumulator, high pressure fuel accumulator and connector branches for using said method Download PDF

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Publication number
EP1137879B1
EP1137879B1 EP00967580A EP00967580A EP1137879B1 EP 1137879 B1 EP1137879 B1 EP 1137879B1 EP 00967580 A EP00967580 A EP 00967580A EP 00967580 A EP00967580 A EP 00967580A EP 1137879 B1 EP1137879 B1 EP 1137879B1
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EP
European Patent Office
Prior art keywords
pressure fuel
inner tube
fuel accumulator
high pressure
base body
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Expired - Lifetime
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EP00967580A
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German (de)
French (fr)
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EP1137879A1 (en
Inventor
Friedrich Boecking
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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 method for processing a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, having a base body which is equipped with a plurality of connection openings.
  • the invention also relates to a high-pressure fuel accumulator and a connecting piece for the application of the method.
  • a high-pressure pump possibly with the aid of a prefeed pump, delivers the fuel to be injected from a tank into the central high-pressure fuel accumulator, which is referred to as a common rail.
  • a common rail From the rail lead fuel lines to the individual injectors, which are assigned to the cylinders of the internal combustion engine.
  • the injectors are controlled individually by the engine electronics as a function of the operating parameters of the internal combustion engine in order to inject fuel into the combustion chamber of the internal combustion engine. Due to the high-pressure fuel storage, the pressure generation and the injection are decoupled from each other.
  • a conventional high-pressure fuel storage is eg in the DE 29521402 U described.
  • the conventional high-pressure fuel accumulator can withstand pressures of up to about 1100 bar.
  • connection openings open tangentially into the interior of a tubular body.
  • the object of the invention is to increase the high pressure resistance of the known high-pressure fuel storage with simple measures.
  • the object underlying the invention is achieved in that in the base body, a rigid inner tube is arranged, whose outer contour corresponds to the desired inner contour of the base body in the region of the connection openings, and that the main body in the region of the connection openings from the outside with a plastic tool in the Inner tube is deformed.
  • the high-pressure resistance of the high-pressure fuel accumulator can be increased.
  • the rounding involves a great deal of effort and high costs. Due to the inventive mechanical deformation of the body, the high pressure resistance of the high-pressure fuel storage is increased in much simpler manner.
  • the high-pressure fuel storage according to the invention can withstand pressures of over 2000 bar.
  • the solution according to the invention can be combined with the known measures, such as the rounding of the intersections, in order to achieve even better results.
  • the solution according to the invention can also with an eccentric arrangement of Connection ports are combined.
  • An embodiment of the method according to the invention is characterized in that a rigid inner tube is arranged in the base body whose outer contour corresponds to the desired inner contour of the base body in the region of the connection openings, and in that the base body in the region of the connection openings from the outside with a tool plastically inwards is deformed.
  • the base body is compressed in the region of the transitions between the connection openings and the base body inwards.
  • the inner tube serves as a template for the base body in the region of the connection openings and remains in the base body after deformation. Due to the deformation of the base body, the region of the greatest tensile stress is removed from the region of the intersection, which has an advantageous effect on the high-pressure resistance of the high-pressure fuel accumulator.
  • Another particular embodiment of the method according to the invention is characterized in that the inner tube is elastically deformed during the plastic deformation of the base body. As a result, is achieved in the ideal state that the inner tube after completion of the deformation over the entire surface of the body.
  • Another particular embodiment of the method according to the invention is characterized in that a mandrel is introduced into the inner tube during the deformation of the base body. With the mandrel an undesirable plastic deformation of the inner tube is avoided during the deformation of the body.
  • connection bore 2 is arranged in the radial direction.
  • the connection bore 2 has two sections 3 and 4 with different inner diameters.
  • On the side facing the interior of the tubular body 1 side of the section 3 is arranged with a smaller diameter.
  • the smaller inner diameter section 3 is followed by the larger inner diameter section 4.
  • an internal thread 5 is formed in the section 4 with a larger inner diameter.
  • the internal thread 5 in the section 4 of the connection bore 2 interacts with an external thread, which is formed on the connecting piece 6.
  • the section 4 of the connecting bore 2 with a larger inner diameter serves to receive the end of a connection piece 6.
  • a through hole 7 is recessed, which connects the interior of the tubular body 1 with a (not shown) high-pressure fuel line.
  • an internal thread 8 is formed in the head of the connecting piece 6, an internal thread 8.
  • the head of the connecting piece 6 is provided with an external hexagon 9.
  • the hexagon socket 9 forms an attack surface for a tool.
  • the facing to the interior of the tubular body 1 end face of the connecting piece 6 accepts two functions according to the present invention.
  • the pressing of the end face of the connecting piece 6 against the portion 3 of the connection bore 2 ensures a seal of the high-pressure chamber of the high-pressure fuel storage to the environment, and on the other hand serves the end face of the connecting piece 6 for transmitting the force necessary for the deformation force on the section 3 of the connection hole 2.
  • the force necessary for the deformation is transmitted via the hexagon socket 9, the external thread 5 of the connecting piece 6 complementary to the internal thread 5 and the end face of the connection piece 6 facing the interior of the tubular base body 1 into the critical region of the section 3 of the connecting bore 2 with the smaller inner diameter ,
  • a defined tightening torque the deformation can be set defined.
  • the in the 4 and 5 illustrated embodiment of a high-pressure fuel accumulator according to the invention comprises a tubular body 21. From the interior of the tubular body 21 is in the radial direction of a connection bore 22 from. The connection bore 22 opens out into a connecting piece 23, which is formed on the tubular base body 21. The connecting piece 23 serves to connect a (not shown) high-pressure fuel line.
  • a circumferential groove 32 is formed. On the circumferential groove 32 engages a tool formed from two semicircular tool halves 24 and 25. The two tool halves 24 and 25 are acted upon in the direction of the arrows 26 and 27 with force and pressed against the tubular body 21. As a result, the tubular base body 21 deforms in the region of the connection bore 22.
  • an inner tube 28 is arranged inside the tubular body 21 inside the tubular body 21 inside the tubular body 21 inside the tubular body 21 inside the tubular body 21 inside the tubular body 21.
  • a dome-shaped recess 29 is formed in the region of the connection bore 22 inside the Inner tube.
  • a formed of two parts 30 and 31 mandrel Inside the Inner tube is arranged a formed of two parts 30 and 31 mandrel.
  • the inner tube 28 is positioned in the tubular base body 21 so that the dome-shaped recess 29 is located exactly in the region of the connection bore 22.
  • the tubular base body 21 is pressed into the dome-shaped recess 29 of the inner tube 28.
  • the inner tube 28 forms practically the template of the pressing process. With the mandrel 30, 31 an undesirable plastic deformation of the inner tube 28 is prevented.
  • the inner tube 28 In the plastic deformation of the tubular base body 21, it is important that the inner tube 28 is elastically mitverformt. In the ideal state, the inner tube 28 lies after the plastic deformation of the tubular base body 21 at least in the region of the connection bore 22 on the entire surface of the tubular base body 21.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren zur Bearbeitung eines Kraftstoffhochdruckspeichers für ein Common-Rail-Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem Grundkörper, der mit mehreren Anschlussöffnungen ausgestattet ist. Die Erfindung betrifft auch einen Kraftstoffhochdruckspeicher und einen Anschlussstutzen zur Anwendung des Verfahrens.The invention relates to a method for processing a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, having a base body which is equipped with a plurality of connection openings. The invention also relates to a high-pressure fuel accumulator and a connecting piece for the application of the method.

In Common-Rail-Einspritzsystemen fördert eine Hochdruckpumpe, eventuell unter Zuhilfenahme einer Vorförderpumpe, den einzuspritzenden Kraftstoff aus einem Tank in den zentralen Kraftstoffhochdruckspeicher, der als Common-Rail bezeichnet wird. Von dem Rail führen Kraftstoffleitungen zu den einzelnen Injektoren, die den Zylindern der Brennkraftmaschine zugeordnet sind. Die Injektoren werden in Abhängigkeit von den Betriebsparametern der Brennkraftmaschine einzeln von der Motorelektronik angesteuert, um Kraftstoff in den Brennraum der Brennkraftmaschine einzuspritzen. Durch den Kraftstoffhochdruckspeicher sind die Druckerzeugung und die Einspritzung voneinander entkoppelt.In common-rail injection systems, a high-pressure pump, possibly with the aid of a prefeed pump, delivers the fuel to be injected from a tank into the central high-pressure fuel accumulator, which is referred to as a common rail. From the rail lead fuel lines to the individual injectors, which are assigned to the cylinders of the internal combustion engine. The injectors are controlled individually by the engine electronics as a function of the operating parameters of the internal combustion engine in order to inject fuel into the combustion chamber of the internal combustion engine. Due to the high-pressure fuel storage, the pressure generation and the injection are decoupled from each other.

Ein herkömmlicher Kraftstoffhochdruckspeicher ist z.B. in der DE 29521402 U beschrieben. Der herkömmliche Kraftstoffhochdruckspeicher hält Drücke von bis zu etwa 1100 bar aus.A conventional high-pressure fuel storage is eg in the DE 29521402 U described. The conventional high-pressure fuel accumulator can withstand pressures of up to about 1100 bar.

Aus der JP 11182381 ist ein Kraftstoffhochdruckspeicher bekannt, dessen Grundkörper im Bereich der Anschlussöffnungen von innen nach außen plastisch verformt wird. Dazu ist es erforderlich ein entsprechendes Werkzeug in den Kraftstoffhochdruckspeicher einzubringen. Daraus resultiert wiederum die Notwendigkeit ein relative große Bearbeitungsöffnung in dem Kraftstoffhochdruckspeicher vorzusehen, was im Hinblick auf die sehr großen Betriebsdrücke von bis zu 2.000 bar von Kraftstoffhochdruckspeichern höchst problematisch ist.From the JP 11182381 is known a high-pressure fuel accumulator whose base body is plastically deformed in the region of the connection openings from the inside out. For this purpose, it is necessary to introduce a corresponding tool in the high-pressure fuel storage. This in turn results in the need to provide a relatively large machining opening in the high-pressure fuel storage, which is highly problematic in view of the very large operating pressures of up to 2,000 bar of high-pressure fuel storage.

Aus der JP 10 176783 A ist ein Kraftstoffhochdruckspeicher mit eingeschraubten Anschlussstutzen bekannt bei dem die Anschlussöffnungen tangential in den Innenraum eines rohrförmigen Grundkörpers münden.From the JP 10 176783 A is a high-pressure fuel storage with screwed connection piece known in which the connection openings open tangentially into the interior of a tubular body.

Aus der JP 10318085 ist ein Kraftstoffhochdruckspeicher bekannt bei dem ein Anschlussstutzen in eine Muffe eingeschraubt wird. Zuvor wird die Muffe über den Kraftstoffhochdruckspeicher geschoben.From the JP 10318085 is known a high-pressure fuel storage in which a connection piece is screwed into a sleeve. Beforehand, the sleeve is pushed over the high-pressure fuel accumulator.

Aufgabe der Erfindung ist es, die Hochdruckfestigkeit des bekannten Kraftstoffhochdruckspeichers mit einfachen Maßnahmen zu erhöhen.The object of the invention is to increase the high pressure resistance of the known high-pressure fuel storage with simple measures.

Die der Erfindung zu Grunde liegende Aufgabe wird dadurch gelöst, dass in dem Grundkörper ein steifes Innenrohr angeordnet wird, dessen Außenkontur der gewünschten Innenkontur des Grundkörpers im Bereich der Anschlussöffnungen entspricht, und dass der Grundkörper im Bereich der Anschlussöffnungen von außen mit einem Werkzeug plastisch in das Innenrohr verformt wird.The object underlying the invention is achieved in that in the base body, a rigid inner tube is arranged, whose outer contour corresponds to the desired inner contour of the base body in the region of the connection openings, and that the main body in the region of the connection openings from the outside with a plastic tool in the Inner tube is deformed.

Im Bereich der Übergänge zwischen den Anschlussöffnungen und dem Grundkörper treten im Betrieb große Zugkräfte auf. Durch Verrunden können die Übergänge zwischen den Anschlussöffnungen und dem Grundkörper entschärft werden. Dadurch kann die Hochdruckfestigkeit des Kraftstoffhochdruckspeichers gesteigert werden. Das Verrunden ist jedoch mit sehr großem Aufwand und hohen Kosten verbunden. Durch die erfindungsgemäße mechanische Verformung des Grundkörpers wird die Hochdruckfestigkeit des Kraftstoffhochdruckspeichers auf viel einfachere Art und Weise gesteigert. Der erfindungsgemäße Kraftstoffhochdruckspeicher hält Drücke von über 2000 bar aus. Vorteilhafterweise kann die erfindungsgemäße Lösung mit den bekannten Maßnahmen, wie dem Verrunden der Verschneidungen, kombiniert werden, um noch bessere Ergebnisse zu erzielen. Die erfindungsgemäße Lösung kann auch mit einer exzentrischen Anordnung der Anschlussöffnungen kombiniert werden.In the area of the transitions between the connection openings and the main body, large tractive forces occur during operation. By rounding off the transitions between the connection openings and the base body can be defused. As a result, the high-pressure resistance of the high-pressure fuel accumulator can be increased. The rounding, however, involves a great deal of effort and high costs. Due to the inventive mechanical deformation of the body, the high pressure resistance of the high-pressure fuel storage is increased in much simpler manner. The high-pressure fuel storage according to the invention can withstand pressures of over 2000 bar. Advantageously, the solution according to the invention can be combined with the known measures, such as the rounding of the intersections, in order to achieve even better results. The solution according to the invention can also with an eccentric arrangement of Connection ports are combined.

Eine Ausführungsart des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, dass in dem Grundkörper ein steifes Innenrohr angeordnet wird, dessen Außenkontur der gewünschten Innenkontur des Grundkörpers im Bereich der Anschlussöffnungen entspricht, und dadurch, dass der Grundkörper im Bereich der Anschlussöffnungen von außen mit einem Werkzeug plastisch nach innen verformt wird. Gemäß der vorliegenden Erfindung wird der Grundkörper im Bereich der Übergänge zwischen den Anschlussöffnungen und dem Grundkörper nach innen gestaucht. Das Innenrohr dient sozusagen als Schablone für den Grundkörper im Bereich der Anschlussöffnungen und verbleibt nach der Verformung in dem Grundkörper. Durch die Verformung des Grundkörpers wird der Bereich der größten Zugspannung aus dem Bereich der Verschneidung genommen, was sich vorteilhaft auf die Hochdruckfestigkeit des Kraftstoffhochdruckspeichers auswirkt.An embodiment of the method according to the invention is characterized in that a rigid inner tube is arranged in the base body whose outer contour corresponds to the desired inner contour of the base body in the region of the connection openings, and in that the base body in the region of the connection openings from the outside with a tool plastically inwards is deformed. According to the present invention, the base body is compressed in the region of the transitions between the connection openings and the base body inwards. The inner tube serves as a template for the base body in the region of the connection openings and remains in the base body after deformation. Due to the deformation of the base body, the region of the greatest tensile stress is removed from the region of the intersection, which has an advantageous effect on the high-pressure resistance of the high-pressure fuel accumulator.

Eine weitere besondere Ausführungsart des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, dass das Innenrohr bei der plastischen Verformung des Grundkörpers elastisch verformt wird. Dadurch wird im Idealzustand erreicht, dass das Innenrohr nach Abschluss der Verformung vollflächig an dem Grundkörper anliegt.Another particular embodiment of the method according to the invention is characterized in that the inner tube is elastically deformed during the plastic deformation of the base body. As a result, is achieved in the ideal state that the inner tube after completion of the deformation over the entire surface of the body.

Eine weitere besondere Ausführungsart des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, dass während der Verformung des Grundkörpers ein Dorn in das Innenrohr eingeführt wird. Mit dem Dorn wird eine unerwünschte plastische Verformung des Innenrohrs während der Verformung des Grundkörpers vermieden.Another particular embodiment of the method according to the invention is characterized in that a mandrel is introduced into the inner tube during the deformation of the base body. With the mandrel an undesirable plastic deformation of the inner tube is avoided during the deformation of the body.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung zwei Ausführungsbeispiele im Einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. In der Zeichnung zeigen:

Fig. 1
eine Ausführungsform eines nicht erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt;
Fig. 2
den Kraftstoffhochdruckspeicher aus Fig. 1 im Längsschnitt;
Fig. 3
eine vergrößerte Ansicht der Einzelheit X aus Fig. 2;
Fig. 4
eine Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Längsschnitt; und
Fig. 5
die Ansicht eines Schnitts entlang der Linie V-V in Fig. 4.
Further advantages, features and details of the invention will become apparent from the following description in which two embodiments are described in detail with reference to the drawing. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. In the drawing show:
Fig. 1
An embodiment of a non-inventive high-pressure fuel storage in cross section;
Fig. 2
the high-pressure fuel storage Fig. 1 in longitudinal section;
Fig. 3
an enlarged view of the detail X from Fig. 2 ;
Fig. 4
an embodiment of a high-pressure fuel storage according to the invention in longitudinal section; and
Fig. 5
the view of a section along the line VV in Fig. 4 ,

Der in den Fig. 1 bis 3 dargestellte Kraftstoffhochdruckspeicher wird von einem rohrförmigen Grundkörper 1 gebildet. In dem rohrförmigen Grundkörper 1 ist in radialer Richtung eine Anschlussbohrung 2 angeordnet. Die Anschlussbohrung 2 weist zwei Abschnitte 3 und 4 mit unterschiedlichen Innendurchmessern auf. Auf der zum Innenraum des rohrförmigen Grundkörpers 1 gewandten Seite ist der Abschnitt 3 mit kleinerem Durchmesser angeordnet. Auf den Abschnitt 3 mit kleinerem Innendurchmesser folgt der Abschnitt 4 mit größerem Innendurchmesser. In dem Abschnitt 4 mit größerem Innendurchmesser ist ein Innengewinde 5 ausgebildet. Das Innengewinde 5 im Abschnitt 4 der Anschlussbohrung 2 wirkt mit einem Außengewinde zusammen, das an dem Anschlussstutzen 6 ausgebildet ist.The in the Fig. 1 to 3 illustrated high-pressure fuel storage is formed by a tubular body 1. In the tubular base body 1, a connection bore 2 is arranged in the radial direction. The connection bore 2 has two sections 3 and 4 with different inner diameters. On the side facing the interior of the tubular body 1 side of the section 3 is arranged with a smaller diameter. The smaller inner diameter section 3 is followed by the larger inner diameter section 4. In the section 4 with a larger inner diameter, an internal thread 5 is formed. The internal thread 5 in the section 4 of the connection bore 2 interacts with an external thread, which is formed on the connecting piece 6.

Der Abschnitt 4 der Anschlussbohrung 2 mit größerem Innendurchmesser dient zur Aufnahme des Endes eines Anschlussstutzens 6. In dem Anschlussstutzen 6 ist eine Durchgangsbohrung 7 ausgespart, die den Innenraum des rohrförmigen Grundkörpers 1 mit einer (nicht dargestellten) Hochdruckkraftstoffleitung verbindet. Zur Befestigung der Kraftstoffhochdruckleitung ist in den Kopf des Anschlussstutzens 6 ein Innengewinde 8 ausgebildet. Außen ist der Kopf des Anschlussstutzens 6 mit einem Außensechskant 9 versehen. Der Außensechskant 9 bildet eine Angriffsfläche für ein Werkzeug.The section 4 of the connecting bore 2 with a larger inner diameter serves to receive the end of a connection piece 6. In the connecting piece 6, a through hole 7 is recessed, which connects the interior of the tubular body 1 with a (not shown) high-pressure fuel line. To attach the High-pressure fuel line is formed in the head of the connecting piece 6, an internal thread 8. On the outside, the head of the connecting piece 6 is provided with an external hexagon 9. The hexagon socket 9 forms an attack surface for a tool.

Durch eine von dem Anschlussstutzen 6 bewirkte elastische Verformung von außen wird der Abschnitt 3 der Anschlussbohrung 2 mit kleinerem Durchmesser zu dem Innenraum des rohrförmigen Grundkörpers 1 hin elastisch verformt. In Fig. 3 ist bei 10 die Kontur des kritischen Bereichs im unbelasteten Zustand und bei 11 die Kontur des kritischen Bereichs im belasteten Zustand angedeutet.By a caused by the connecting piece 6 elastic deformation from the outside of the portion 3 of the connection bore 2 with a smaller diameter is elastically deformed to the interior of the tubular body 1 back. In Fig. 3 at 10 is the contour of the critical area in the unloaded state and at 11 the contour of the critical area indicated in the loaded state.

Die zu dem Innenraum des rohrförmigen Grundkörpers 1 gewandte Stirnfläche des Anschlussstutzens 6 übernimmt gemäß der vorliegenden Erfindung zwei Funktionen. Zum einen sorgt das Anpressen der Stirnfläche des Anschlussstutzens 6 gegen den Abschnitt 3 der Anschlussbohrung 2 für eine Abdichtung des mit Hochdruck beaufschlagten Innenraums des Kraftstoffhochdruckspeichers zur Umgebung, und zum anderen dient die Stirnfläche des Anschlussstutzens 6 zur Übertragung der für die Verformung notwendigen Kraft auf den Abschnitt 3 der Anschlussbohrung 2.The facing to the interior of the tubular body 1 end face of the connecting piece 6 accepts two functions according to the present invention. On the one hand, the pressing of the end face of the connecting piece 6 against the portion 3 of the connection bore 2 ensures a seal of the high-pressure chamber of the high-pressure fuel storage to the environment, and on the other hand serves the end face of the connecting piece 6 for transmitting the force necessary for the deformation force on the section 3 of the connection hole 2.

Die für die Verformung notwendige Kraft wird über den Außensechskant 9, das zu dem Innengewinde 5 komplementäre Außengewinde des Anschlussstutzens 6 und die zum Innenraum des rohrförmigen Grundkörpers 1 gewandte Stirnfläche des Anschlussstutzens 6 in den kritischen Bereich des Abschnitts 3 der Anschlussbohrung 2 mit dem kleineren Innendurchmesser übertragen. Durch ein definiertes Anzugsmoment kann die Verformung definiert eingestellt werden.The force necessary for the deformation is transmitted via the hexagon socket 9, the external thread 5 of the connecting piece 6 complementary to the internal thread 5 and the end face of the connection piece 6 facing the interior of the tubular base body 1 into the critical region of the section 3 of the connecting bore 2 with the smaller inner diameter , By a defined tightening torque, the deformation can be set defined.

Durch die elastische Verformung des verwendeten Werkstoffs im kritischen Bereich am Bohrungseinlauf können ohne Belastung durch Druck Druckeigenspannungen in den Bereich der Verschneidung eingebracht werden. Unter dem im Betrieb herrschenden Innendruck werden diese Druckeigenspannungen dann aufgehoben. Dadurch wird der Bereich mit hohen Zugspannungen deutlich verkleinert. In Fig. 3 ist bei 12 angedeutet, dass der kritische Bereich zusätzlich zu den erfindungsgemäßen Maßnahmen noch verrundet ist. Die sich aus den unterschiedlichen Innendurchmessern der Abschnitte 3 und 4 der Anschlussbohrung 2 ergebende Stufe 13 wird auch als Boden der Anschlussbohrung 2 bezeichnet.Due to the elastic deformation of the material used In the critical area at the bore inlet, compressive stresses can be introduced into the area of the intersection without pressure being applied. Under the pressure prevailing in the operating internal pressure these residual compressive stresses are then canceled. As a result, the area with high tensile stresses is significantly reduced. In Fig. 3 is indicated at 12 that the critical area in addition to the inventive measures is still rounded. The resulting from the different inner diameters of the sections 3 and 4 of the connection bore 2 stage 13 is also referred to as the bottom of the connection bore 2.

Die in den Fig. 4 und 5 dargestellte Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers umfasst einen rohrförmigen Grundkörper 21. Von dem Innenraum des rohrförmigen Grundkörpers 21 geht in radialer Richtung eine Anschlussbohrung 22 aus. Die Anschlussbohrung 22 mündet außen in einen Anschlussstutzen 23, der an dem rohrförmigen Grundkörper 21 ausgebildet ist. Der Anschlussstutzen 23 dient zum Anschluss einer (nicht dargestellten) Kraftstoffhochdruckleitung.The in the 4 and 5 illustrated embodiment of a high-pressure fuel accumulator according to the invention comprises a tubular body 21. From the interior of the tubular body 21 is in the radial direction of a connection bore 22 from. The connection bore 22 opens out into a connecting piece 23, which is formed on the tubular base body 21. The connecting piece 23 serves to connect a (not shown) high-pressure fuel line.

An dem Übergang zwischen dem Anschlussstutzen 23 zum Grundkörper 21 ist eine Umfangsnut 32 ausgebildet. An der Umfangsnut 32 greift ein aus zwei halbrunden Werkzeughälften 24 und 25 gebildetes Werkzeug an. Die beiden Werkzeughälften 24 und 25 werden in Richtung der Pfeile 26 und 27 mit Kraft beaufschlagt und gegen den rohrförmigen Grundkörper 21 gedrückt. Dadurch verformt sich der rohrförmige Grundkörper 21 im Bereich der Anschlussbohrung 22.At the transition between the connecting piece 23 to the main body 21, a circumferential groove 32 is formed. On the circumferential groove 32 engages a tool formed from two semicircular tool halves 24 and 25. The two tool halves 24 and 25 are acted upon in the direction of the arrows 26 and 27 with force and pressed against the tubular body 21. As a result, the tubular base body 21 deforms in the region of the connection bore 22.

Im Inneren des rohrförmigen Grundkörpers 21 ist ein Innenrohr 28 angeordnet. An der äußeren Mantelfläche des Innenrohrs 28 ist im Bereich der Anschlussbohrung 22 eine kalottenförmige Vertiefung 29 ausgebildet. Im Inneren des Innenrohrs ist ein aus zwei Teilen 30 und 31 gebildeter Dorn angeordnet.Inside the tubular body 21, an inner tube 28 is arranged. On the outer circumferential surface of the inner tube 28, a dome-shaped recess 29 is formed in the region of the connection bore 22. Inside the Inner tube is arranged a formed of two parts 30 and 31 mandrel.

Das Innenrohr 28 ist so in dem rohrförmigen Grundkörper 21 positioniert, dass sich die kalottenförmige Vertiefung 29 genau im Bereich der Anschlussbohrung 22 befindet. Durch Verpressen des rohrförmigen Grundkörpers 21 im Bereich der Anschlussbohrung 22 mit dem Werkzeug 24, 25 wird der rohrförmige Grundkörper 21 in die kalottenförmige Vertiefung 29 des Innenrohrs 28 gedrückt. Dabei bildet das Innenrohr 28 praktisch die Schablone des Pressvorgangs. Mit dem Dorn 30, 31 wird eine unerwünschte plastische Verformung des Innenrohrs 28 verhindert.The inner tube 28 is positioned in the tubular base body 21 so that the dome-shaped recess 29 is located exactly in the region of the connection bore 22. By pressing the tubular base body 21 in the region of the connection bore 22 with the tool 24, 25, the tubular base body 21 is pressed into the dome-shaped recess 29 of the inner tube 28. In this case, the inner tube 28 forms practically the template of the pressing process. With the mandrel 30, 31 an undesirable plastic deformation of the inner tube 28 is prevented.

Bei der plastischen Verformung des rohrförmigen Grundkörpers 21 kommt es darauf an, dass das Innenrohr 28 elastisch mitverformt wird. Im Idealzustand liegt das Innenrohr 28 nach der plastischen Verformung des rohrförmigen Grundkörpers 21 zumindest im Bereich der Anschlussbohrung 22 vollflächig an dem rohrförmigen Grundkörper 21 an.In the plastic deformation of the tubular base body 21, it is important that the inner tube 28 is elastically mitverformt. In the ideal state, the inner tube 28 lies after the plastic deformation of the tubular base body 21 at least in the region of the connection bore 22 on the entire surface of the tubular base body 21.

Claims (3)

  1. Method for machining a high-pressure fuel accumulator for a common-rail fuel injection system of an internal combustion engine, with a basic body (21) which is equipped with a plurality of connecting orifices (22), the basic body (21) being deformed in the region of the connecting orifices (22), characterized in that the basic body (21) has arranged in it a rigid inner tube (28), the outer contour of which corresponds to the desired inner contour of the basic body (21) in the region of the connecting orifices (22), and in that the basic body (21) is deformed plastically into the inner tube (28) from outside in the region of the connecting orifices (22) by means of a tool (24, 25).
  2. Method according to Claim 1, characterized in that the inner tube (28) is deformed elastically during the plastic deformation of the basic body (21).
  3. Method according to Claim 1 or 2, characterized in that a mandrel (30, 31) is introduced into the inner tube (28) during the deformation of the basic body (21).
EP00967580A 1999-10-07 2000-09-19 Method for machining a high pressure fuel accumulator, high pressure fuel accumulator and connector branches for using said method Expired - Lifetime EP1137879B1 (en)

Applications Claiming Priority (3)

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DE19948338A DE19948338A1 (en) 1999-10-07 1999-10-07 Process for processing a high-pressure fuel accumulator, high-pressure fuel accumulator and connecting piece for using the method
DE19948338 1999-10-07
PCT/DE2000/003246 WO2001025616A1 (en) 1999-10-07 2000-09-19 Method for machining a high pressure fuel accumulator, high pressure fuel accumulator and connector branches for using said method

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EP1137879B1 true EP1137879B1 (en) 2008-03-05

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US (1) US6470856B1 (en)
EP (1) EP1137879B1 (en)
JP (1) JP2003511606A (en)
DE (2) DE19948338A1 (en)
WO (1) WO2001025616A1 (en)

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Also Published As

Publication number Publication date
EP1137879A1 (en) 2001-10-04
WO2001025616A1 (en) 2001-04-12
JP2003511606A (en) 2003-03-25
DE50015020D1 (en) 2008-04-17
US6470856B1 (en) 2002-10-29
DE19948338A1 (en) 2001-04-12

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