EP1144853A1 - High-pressure fuel accumulator and a method for producing the same - Google Patents

High-pressure fuel accumulator and a method for producing the same

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Publication number
EP1144853A1
EP1144853A1 EP00979428A EP00979428A EP1144853A1 EP 1144853 A1 EP1144853 A1 EP 1144853A1 EP 00979428 A EP00979428 A EP 00979428A EP 00979428 A EP00979428 A EP 00979428A EP 1144853 A1 EP1144853 A1 EP 1144853A1
Authority
EP
European Patent Office
Prior art keywords
base body
pressure fuel
tubular base
connection openings
connection
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
EP00979428A
Other languages
German (de)
French (fr)
Other versions
EP1144853B1 (en
Inventor
Kurt Frank
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1144853A1 publication Critical patent/EP1144853A1/en
Application granted granted Critical
Publication of EP1144853B1 publication Critical patent/EP1144853B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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

Definitions

  • the invention relates to a Kraf high-pressure accumulator for a common rail fuel injection system of an internal combustion engine, with a hollow base body, which is equipped with a plurality of port openings, and a method for producing such a high-pressure fuel storage.
  • a high-pressure pump conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as the common rail.
  • Fuel lines lead from the rail to the individual injectors, which are assigned to the cylinders of the internal combustion engine. The injectors are dependent on the
  • Operating parameters of the internal combustion engine are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine.
  • the pressure generation and the injection are decoupled from one another by the high-pressure fuel reservoir.
  • a conventional high-pressure fuel accumulator is, for example, in described in DE 195 48 611.
  • the conventional high-pressure fuel accumulators withstand pressures of up to around 1100 bar.
  • the object of the invention is to increase the high-pressure strength of the known high-pressure fuel reservoir with simple measures.
  • High-pressure strength of the high-pressure fuel reservoir is primarily limited by the intersections between the connection openings and the base body. Stress peaks occur in the intersection area during operation, which can lead to cracks in the base body.
  • the solution according to the invention increases the high-pressure strength of the high-pressure fuel accumulator without significantly increasing its volume.
  • the interior of the base body can e.g. have a cylindrical or spherical geometry.
  • a special embodiment of the high-pressure fuel accumulator according to the invention is achieved in that a connection piece with a connection hole is formed on the base body, the center line of which is arranged perpendicular to the flat surface in the region of the connection opening. This has the advantage that the voltage peaks in the intersection area are minimized.
  • the task above is for one High-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a tubular base body which is equipped with a plurality of connection openings, in that the inner diameter of the tubular base body is expanded in the region of the connection openings.
  • the pressure resistance of the high-pressure fuel reservoir increases if the ratio between the inside diameter of the base body and the inside diameter of the connection openings is chosen to be as large as possible.
  • the local widening of the inner body diameter leads to an increase in this diameter ratio in the critical area of the connection openings without the outer dimensions of the high-pressure fuel reservoir according to the invention increasing.
  • connection openings is equipped, also solved in that the interior of the tubular base body is flat in the area of the connection openings. This means that the inside diameter of the tubular base body assumes the value "infinite" in the area of the connection openings. This measure leads to the maximum high-pressure strength of the high-pressure fuel reservoir according to the invention with a minimized construction volume.
  • the connection openings are generally formed by connection bores, the center lines of which are each arranged perpendicular to the flat surface in the region of the connection openings.
  • the above object is in a method for producing the above
  • High-pressure fuel accumulator solved in that the tubular base body in the area of the connection openings is deformed in such a way that it projects inwards and that the area projecting inward is machined in order to expand the inner diameter of the tubular base body in the area of the connection openings.
  • local expansion of the base body inner diameter is achieved in a simple manner only in the area of the connection openings.
  • the method is characterized in that the interior of the tubular base body in the area of the connection openings is processed with the aid of an electrochemical removal process (ECM, electro-chemical machining).
  • ECM electrochemical removal process
  • FIG. 2 shows a detail from FIG. 1 according to a second embodiment of the invention
  • High-pressure fuel accumulator comprises a tubular
  • Base body 1 In the tubular base body 1, a longitudinal bore 2 forms the storage volume.
  • a connection piece 3 is formed on the tubular base body 1, in which a connection bore 4 extends transversely to the longitudinal axis of the tubular base body 1. The connection bore 4 opens into the longitudinal bore 2.
  • FIG. 2 shows a section of a second embodiment of a high-pressure fuel accumulator according to the invention in cross section.
  • a longitudinal bore 2 is arranged in a tubular base body 1.
  • a connection bore 4 opens into the longitudinal bore 2.
  • Connection bore 4 opens into the longitudinal bore 2, there is a cuboid recess 5 in the tubular base body 1. This creates a flat surface 6 in the interior of the base body 1, which extends perpendicular to the center line of the connection bore 4.
  • 3 shows a longitudinal section through a third embodiment of a high-pressure fuel accumulator according to the invention.
  • the high-pressure fuel reservoir shown in FIG. 3 comprises a tubular base body 1.
  • a longitudinal bore 2 is arranged in the tubular base body 1.
  • a radial connecting bore 4 opens into the longitudinal bore 2.
  • the area 8 of the outer lateral surface of the tubular base body 1 surrounding the connection bore 4 is pressed in over the entire circumference of the tubular base body 1 with the aid of a corresponding tool.
  • the deformation of the outer circumferential surface of the tubular base body 1 leads to an annular area 9 projecting inside the tubular base body 1, which region is shown in broken lines in FIG. 3.
  • the projecting area 9 is removed in the mouth area of the connection bore 4 in such a way that a flat surface 6 results.
  • FIG. 4 shows a fourth embodiment of a high-pressure fuel accumulator according to the invention in longitudinal section.
  • the high-pressure fuel reservoir shown in FIG. 4 comprises a tubular base body 1.
  • a longitudinal bore 2 is recessed in the tubular base body 1.
  • a radial connection bore 4 opens into the longitudinal bore 2.
  • an ECM electrode is inserted into the longitudinal bore 2. With the help of the ECM electrode 10, the material of the tubular base body 1 in the area 5 is removed. This results in a flat surface 6 in the mouth area of the connection bore 4.
  • ECM Electro-Chemical Machining
  • the Electrochemical removal which is also referred to as Elysier, is a removal process in which metallic material is anodically dissolved under the action of an electrical current and an electrolytic solution.
  • the current flow can be caused by an external power source, but also by local element formation on the workpiece (internal voltage source).
  • the principle of action of anodic metal dissolution is based on electrochemical reactions in which metal ions pass from the metal phase into the electrolyte phase or into a reaction product phase. These reactions are initiated by charge exchange processes and follow the inner kinetics of a galvanic element.
  • the inner diameter of the tubular base body 1 acting on the intersection between the longitudinal bore 2 and the connection bore 4 is locally expanded, i.e. made as large as possible without the high-pressure fuel accumulator according to the invention taking on extreme external dimensions. This ensures maximum high-pressure strength with a minimal construction volume.

Landscapes

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

Abstract

The invention relates to a high-pressure fuel accumulator for a common rail fuel injection system in an internal combustion engine, comprising a hollow base body (1) which is equipped with several connecting bores (4). In order to increase the high-pressure resistance, the inner chamber of the base body (1) is configured in a level manner in the region of the connecting bores (4). The invention also relates to a method for producing a high-pressure fuel accumulator.

Description

Kraftstoffhochdruckspeicher und Verfahren zur Herstellung eines KraftstoffhochdruckspeichersHigh-pressure fuel accumulator and method for producing a high-pressure fuel accumulator
Stand der TechnikState of the art
Die Erfindung betrifft einen Kraf stoffhochdruckspeicher für ein Common-Rail-Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem hohlen Grundkörper, der mit mehreren Anschlussöf nungen ausgestattet ist, und ein Verfahren zum Herstellen eines derartigen Kraftstoffhochdruckspeichers .The invention relates to a Kraf high-pressure accumulator for a common rail fuel injection system of an internal combustion engine, with a hollow base body, which is equipped with a plurality of port openings, and a method for producing such a high-pressure fuel storage.
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 denIn common-rail injection systems, a high-pressure pump, possibly with the aid of a prefeed pump, conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as the common rail. Fuel lines lead from the rail to the individual injectors, which are assigned to the cylinders of the internal combustion engine. The injectors are dependent on the
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.Operating parameters of the internal combustion engine are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine. The pressure generation and the injection are decoupled from one another by the high-pressure fuel reservoir.
Ein herkömmlicher Kraftsto fhochdruckspeicher ist z.B. in der DE 195 48 611 beschrieben. Die herkömmlichen Kraftstoffhochdruckspeicher halten Drücke von bis zu etwa 1100 bar aus.A conventional high-pressure fuel accumulator is, for example, in described in DE 195 48 611. The conventional high-pressure fuel accumulators withstand pressures of up to around 1100 bar.
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 strength of the known high-pressure fuel reservoir with simple measures.
Die Aufgabe ist bei einem Kraftstoffhochdruckspeicher für ein Common-Rail -Kraftstoffeinspritzsystem einerIn a high-pressure fuel accumulator for a common rail fuel injection system, the task is one
Brennkraftmaschine, mit einem hohlen Grundkörper, der mit mehreren Anschlussöffnungen ausgestattet ist, dadurch gelöst, dass der Innenraum des Grundkörpers im Bereich der Anschlussöffnungen eben ausgebildet ist. Im Rahmen der vorliegenden Erfindung hat sich herausgestellt, dass dieInternal combustion engine, with a hollow base body, which is equipped with several connection openings, solved in that the interior of the base body is flat in the area of the connection openings. In the context of the present invention, it has been found that the
Hochdruckfestigkeit des Kraftstoffhochdruckspeichers primär durch die Verschneidungen zwischen den Anschlussöffnungen und dem Grundkörper beschränkt wird . Im Verschneidungsbereich treten im Betrieb Spannungsspitzen auf, die zu Rissbildungen im Grundkörper führen können. Durch die erfindungsgemäße Lösung wird die Hochdruckfestigkeit des Kraftstoffhochdruckspeichers erhöht, ohne dass dessen Bauvolumen wesentlich zunimmt. Der Innenraum des Grundkörpers kann z.B. eine zylinderförmige oder kugelförmige Geometrie aufweisen.High-pressure strength of the high-pressure fuel reservoir is primarily limited by the intersections between the connection openings and the base body. Stress peaks occur in the intersection area during operation, which can lead to cracks in the base body. The solution according to the invention increases the high-pressure strength of the high-pressure fuel accumulator without significantly increasing its volume. The interior of the base body can e.g. have a cylindrical or spherical geometry.
Eine besondere Ausführungsart des erfindungsgemäßen Kraftstoffhochdruckspeichers ist dadurch gelöst, dass an dem Grundkδrper ein Anschlussstutzen mit einer Anschlussbohrung ausgebildet ist, deren Mittellinie senkrecht zu der ebenen Fläche im Bereich der Anschlussöffnung angeordnet ist. Das liefert den Vorteil, dass die Spannungsspitzen im Verschneidungsbereich minimiert werden.A special embodiment of the high-pressure fuel accumulator according to the invention is achieved in that a connection piece with a connection hole is formed on the base body, the center line of which is arranged perpendicular to the flat surface in the region of the connection opening. This has the advantage that the voltage peaks in the intersection area are minimized.
Die oben angegebene Aufgabe ist bei einem Kraf stoffhochdruckspeicher für ein Common-Rail- Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem rohrförmigen Grundkörper, der mit mehreren Anschlussöffnungen ausgestattet ist, dadurch gelöst, dass der Innendurchmesser des rohrförmigen Grundkörpers im Bereich der Anschlussöffnungen erweitert ist . Die Druckfestigkeit des Kraftstoffhochdruckspeichers nimmt zu, wenn das Verhältnis zwischen dem Innendurchmesser des Grundkörpers und dem Innendurchmesser der Anschlussöffnungen möglichst groß gewählt wird. Die lokale Erweiterung des Grundkörperinnendurchmessers führt zu einer Erhöhung dieses Durchmesserverhältnisses im kritischen Bereich der Anschlussöffnungen, ohne dass die Außenabmessungen des erfindungsgemäßen Kraftstoffhochdruckspeichers zunehmen.The task above is for one High-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a tubular base body which is equipped with a plurality of connection openings, in that the inner diameter of the tubular base body is expanded in the region of the connection openings. The pressure resistance of the high-pressure fuel reservoir increases if the ratio between the inside diameter of the base body and the inside diameter of the connection openings is chosen to be as large as possible. The local widening of the inner body diameter leads to an increase in this diameter ratio in the critical area of the connection openings without the outer dimensions of the high-pressure fuel reservoir according to the invention increasing.
Die oben angegebene Aufgabe ist bei einemThe task above is for one
Kraftstoffhochdruckspeicher für ein Common-Rail -High-pressure fuel accumulator for a common rail -
Kraftstoffeinspritzsystem einer Brennkraftmaschine mit einem rohrförmigen Grundkörper, der mit mehrerenFuel injection system of an internal combustion engine with a tubular base body with several
Anschlussöffnungen ausgestattet ist, auch dadurch gelöst, dass der Innenraum des rohrförmigen Grundkörpers im Bereich der Anschlussöffnungen eben ausgebildet ist. Das bedeutet, dass der Innendurchmesser des rohrförmigen Grundkörpers im Bereich der Anschlussöffnungen den Wert "unendlich" annimmt. Diese Maßnahme führt zur maximalen Hochdruckfestigkeit des erfindungsgemäßen Kraftstoffhochdruckspeichers bei minimiertem Bauvolumen. Die Anschlussöffnungen werden in der Regel von Anschlussbohrungen gebildet, deren Mittellinien jeweils senkrecht zu der ebenen Fläche im Bereich der Anschlussöffnungen angeordnet sind.Connection openings is equipped, also solved in that the interior of the tubular base body is flat in the area of the connection openings. This means that the inside diameter of the tubular base body assumes the value "infinite" in the area of the connection openings. This measure leads to the maximum high-pressure strength of the high-pressure fuel reservoir according to the invention with a minimized construction volume. The connection openings are generally formed by connection bores, the center lines of which are each arranged perpendicular to the flat surface in the region of the connection openings.
Die oben angegebene Aufgabe ist bei einem Verfahren zum Herstellen des vorab beschriebenenThe above object is in a method for producing the above
Kraftstoffhochdruckspeichers dadurch gelöst, dass der rohrförmige Grundkörper im Bereich der Anschlussöffnungen so nach innen verformt wird, dass er nach innen vorspringt und dass der nach innen vorspringende Bereich bearbeitet wird, um den Innendurchmesser des rohrförmigen Grundkörpers im Bereich der Anschlussöffnungen zu erweitern. Dadurch wird auf einfache Art und Weise eine lokale Erweiterung des Grundkörperinnendurchmessers nur im Bereich der Anschlussöffnungen erreicht .High-pressure fuel accumulator solved in that the tubular base body in the area of the connection openings is deformed in such a way that it projects inwards and that the area projecting inward is machined in order to expand the inner diameter of the tubular base body in the area of the connection openings. As a result, local expansion of the base body inner diameter is achieved in a simple manner only in the area of the connection openings.
Eine besondere Ausführungsart des erfindungsgemäßenA special embodiment of the invention
Verfahrens ist dadurch gekennzeichnet, dass der Innenraum des rohrförmigen Grundkörpers im Bereich der Anschlussöffnungen mit Hilfe eines elektrochemischen Abtragverfahrens (ECM, Electro-Chemical Machining) bearbeitet wird. Die Anwendung dieses Verfahrens hat sich in der Praxis als besonders vorteilhaft erwiesen.The method is characterized in that the interior of the tubular base body in the area of the connection openings is processed with the aid of an electrochemical removal process (ECM, electro-chemical machining). The use of this method has proven to be particularly advantageous in practice.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung Ausführungsbeispiele der Erfindung 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.Further advantages, features and details of the invention emerge from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawing. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination.
In der Zeichnung zeigen:The drawing shows:
Fig. 1: eine erste Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt;1: a first embodiment of a high-pressure fuel accumulator according to the invention in cross section;
Fig. 2: einen Ausschnitt aus Fig. 1 gemäß einer zweiten Ausführungsform der Erfindung;FIG. 2 shows a detail from FIG. 1 according to a second embodiment of the invention;
Fig. 3: eine dritte Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Längsschnitt; und3: a third embodiment of a high-pressure fuel reservoir according to the invention in Longitudinal section; and
Fig. 4: einen Längsschnitt durch einen erfindungsgemäßen Kraftstoffhochdruckspeicher mit einem eingeführten Bearbeitungswerkzeug.4: a longitudinal section through a high-pressure fuel reservoir according to the invention with an inserted machining tool.
Der in Fig. 1 im Querschnitt dargestellteThe one shown in cross section in FIG. 1
Kraftstoffhochdruckspeicher umfasst einen rohrförmigenHigh-pressure fuel accumulator comprises a tubular
Grundkörper 1. In dem rohrförmigen Grundkörper 1 bildet eine Längsbohrung 2 das Speichervolumen. An dem rohrförmigen Grundkörper 1 ist ein Anschlussstutzen 3 ausgebildet, in dem sich eine Anschlussbohrung 4 quer zur Längsachse des rohrförmigen Grundkörpers 1 erstreckt . Die Anschlussbohrung 4 mündet in die Längsbohrung 2.Base body 1. In the tubular base body 1, a longitudinal bore 2 forms the storage volume. A connection piece 3 is formed on the tubular base body 1, in which a connection bore 4 extends transversely to the longitudinal axis of the tubular base body 1. The connection bore 4 opens into the longitudinal bore 2.
Ein Bereich 5 des rohrförmigen Grundkörpers 1 wurde mit Hilfe eines Material abtragenden Bearbeitungsverfahrens entfernt. Auf diese Art und Weise wurde im Mündungsbereich der Anschlussbohrung 4 eine ebene Fläche 6 geschaffen. Die ebene Fläche 6 erstreckt sich senkrecht zur Mitellinie der Anschlussbohrung 4. Die Kontur des zylinderförmigen Innenraums des rohrförmigen Grundkörpers 1 ist in Fig. 1 gestrichelt angedeutet .An area 5 of the tubular base body 1 was removed with the aid of a material-removing machining process. In this way, a flat surface 6 was created in the mouth area of the connection bore 4. The flat surface 6 extends perpendicular to the center line of the connection bore 4. The contour of the cylindrical interior of the tubular base body 1 is indicated by dashed lines in FIG. 1.
In Fig. 2 ist ein Ausschnitt einer zweiten Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt dargestellt. In einem rohrförmigen Grundkörper 1 ist, wie bei der in Fig. 1 dargestellten Ausführungsform, eine Längsbohrung 2 angeordnet. In die Längsbohrung 2 mündet eine Anschlussbohrung 4. In dem Bereich, wo die2 shows a section of a second embodiment of a high-pressure fuel accumulator according to the invention in cross section. As in the embodiment shown in FIG. 1, a longitudinal bore 2 is arranged in a tubular base body 1. A connection bore 4 opens into the longitudinal bore 2. In the area where the
Anschlussbohrung 4 in die Längsbohrung 2 mündet, befindet sich eine quaderförmige Ausnehmung 5 in dem rohrförmigen Grundkörper 1. Dadurch wird in dem Innenraum des Grundkörpers 1 eine ebene Fläche 6 geschaffen, die sich senkrecht zu der Mittellinie der Anschlussbohrung 4 erstreckt . In Fig. 3 ist ein Längsschnitt durch eine dritte Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers dargestellt. Der in Fig. 3 dargestellte Kraftstoffhochdruckspeicher umfasst einen rohrförmigen Grundkörper 1. In dem rohrförmigen Grundkörper 1 ist eine Längsbohrung 2 angeordnet. In die Längsbohrung 2 mündet eine radiale Anschlussbohrung 4.Connection bore 4 opens into the longitudinal bore 2, there is a cuboid recess 5 in the tubular base body 1. This creates a flat surface 6 in the interior of the base body 1, which extends perpendicular to the center line of the connection bore 4. 3 shows a longitudinal section through a third embodiment of a high-pressure fuel accumulator according to the invention. The high-pressure fuel reservoir shown in FIG. 3 comprises a tubular base body 1. A longitudinal bore 2 is arranged in the tubular base body 1. A radial connecting bore 4 opens into the longitudinal bore 2.
Der die Anschlussbohrung 4 umgebende Bereich 8 der äußeren Mantelfläche des rohrförmigen Grundkörpers 1 ist über den gesamten Umfang des rohrförmigen Grundkörpers 1 mit Hilfe eines entsprechenden Werkzeugs eingedrückt . Die Verformung der äußeren Mantelfläche des rohrförmigen Grundkörpers 1 führt dazu, dass im Inneren des rohrförmigen Grundkörpers 1 ein ringförmiger Bereich 9 vorspringt, der in Fig. 3 gestrichelt dargestellt ist. Der vorspringende Bereich 9 ist im Mündungsbereich der Anschlussbohrung 4 so abgetragen, dass sich eine ebene Fläche 6 ergibt.The area 8 of the outer lateral surface of the tubular base body 1 surrounding the connection bore 4 is pressed in over the entire circumference of the tubular base body 1 with the aid of a corresponding tool. The deformation of the outer circumferential surface of the tubular base body 1 leads to an annular area 9 projecting inside the tubular base body 1, which region is shown in broken lines in FIG. 3. The projecting area 9 is removed in the mouth area of the connection bore 4 in such a way that a flat surface 6 results.
In Fig. 4 ist eine vierte Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Längsschnitt dargestellt. Der in Fig. 4 dargestellte Kraftstoffhochdruckspeicher umfasst einen rohrförmigen Grundkδrper 1. In dem rohrförmigen Grundkörper 1 ist eine Längsbohrung 2 ausgespart. In die Längsbohrung 2 mündet eine radiale Anschlussbohrung 4.4 shows a fourth embodiment of a high-pressure fuel accumulator according to the invention in longitudinal section. The high-pressure fuel reservoir shown in FIG. 4 comprises a tubular base body 1. A longitudinal bore 2 is recessed in the tubular base body 1. A radial connection bore 4 opens into the longitudinal bore 2.
Zum Entfernen des Bereichs 5 im Inneren des Grundkörpers 1 ist eine ECM-Elektrode in die Längsbohrung 2 eingeführt. Mit Hilfe der ECM-Elektrode 10 wird das Material des rohrförmigen Grundkörpers 1 in dem Bereich 5 entfernt. Dadurch ergibt sich im Mündungsbereich der Anschlussbohrung 4 eine ebene Fläche 6.To remove the area 5 inside the base body 1, an ECM electrode is inserted into the longitudinal bore 2. With the help of the ECM electrode 10, the material of the tubular base body 1 in the area 5 is removed. This results in a flat surface 6 in the mouth area of the connection bore 4.
ECM (Electro-Chemical Machining) ist die englische Bezeichnung für elektrochemisches Abtragen. Das elektrochemische Abtragen, das auch als Elysieren bezeichnet wird, ist ein Abtragverfahren, bei dem metallischer Werkstoff unter Einwirkung eines elektrischen Stroms und einer Elektrolytlösung anodisch aufgelöst wird. Der Stromfluss kann dabei durch eine äußere Stomquelle, aber auch durch eine Lokalelementbildung am Werkstück (innere Spannungsquelle) bewirkt werden. Das Wirkprinzip des anodischen Metallauflösens beruht auf elektrochemischen Reaktionen, bei denen Metallionen aus der Metallphase in die Elektrolytphase oder in eine Reaktionsproduktphase übergehen. Diese Reaktionen werden durch Ladungsaustauschvorgänge in Gang gesetzt und folgen der inneren Kinetik eines galvanischen Elements.ECM (Electro-Chemical Machining) is the English term for electrochemical ablation. The Electrochemical removal, which is also referred to as Elysier, is a removal process in which metallic material is anodically dissolved under the action of an electrical current and an electrolytic solution. The current flow can be caused by an external power source, but also by local element formation on the workpiece (internal voltage source). The principle of action of anodic metal dissolution is based on electrochemical reactions in which metal ions pass from the metal phase into the electrolyte phase or into a reaction product phase. These reactions are initiated by charge exchange processes and follow the inner kinetics of a galvanic element.
Gemäß der vorliegenden Erfindung wird der an der Verschneidung zwischen der Längsbohrung 2 und der Anschlussbohrung 4 wirkende Innendurchmesser des rohrförmigen Grundkörpers 1 lokal erweitert, d.h. so groß wie möglich gemacht, ohne dass der erfindungsgemäße Kraftstoffhochdruckspeicher extreme Außenmaße annimmt. Dadurch wird eine maximale Hochdruckfestigkeit bei minimiertem Bauvolumen erzielt. According to the present invention, the inner diameter of the tubular base body 1 acting on the intersection between the longitudinal bore 2 and the connection bore 4 is locally expanded, i.e. made as large as possible without the high-pressure fuel accumulator according to the invention taking on extreme external dimensions. This ensures maximum high-pressure strength with a minimal construction volume.

Claims

Ansprüche Expectations
1. Kraftstoffhochdruckspeicher für ein Common-Rail-1. High-pressure fuel accumulator for a common rail
Kraftstoffeinspritzsystem einer Brennkraf maschine, mit einem hohlen Grundkörper (1) , der mit mehreren Anschlussöffnungen (4) ausgestattet ist, dadurch gekennzeichnet, dass der Innenraum des Grundkörpers (1) im Bereich der Anschlussöffnungen (4) eben ausgebildet ist.Fuel injection system of an internal combustion engine, with a hollow base body (1) which is equipped with a plurality of connection openings (4), characterized in that the interior of the base body (1) is flat in the area of the connection openings (4).
2. Kraftstoffhochdruckspeicher nach Anspruch 1, dadurch, gekennzeichnet, dass an dem Grundkδrper (1) ein Anschlussstutzen (3) mit einer Anschlussbohrung (4) ausgebildet ist, deren Mittellinie senkrecht zu der ebenen Fläche (6) im Bereich der Anschlussöffnung (4) angeordnet ist .2. High-pressure fuel accumulator according to claim 1, characterized in that on the base body (1) a connection piece (3) is formed with a connection bore (4), the center line of which is arranged perpendicular to the flat surface (6) in the region of the connection opening (4) is.
3. Kraftstoffhochdruckspeicher für ein Common-Rail- Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem rohrförmigen Grundkörper (1) , der mit mehreren Anschlussöffnungen (4) ausgestattet ist, dadurch gekennzeichnet, dass der Innendurchmesser des rohrförmigen Grundkörpers (1) im Bereich der Anschlussöffnungen (4) erweitert ist.3. High-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a tubular base body (1) which is equipped with a plurality of connection openings (4), characterized in that the inner diameter of the tubular base body (1) in the region of the connection openings (4) is expanded.
4. Kraftstoffhochdruckspeicher für ein Common-Rail- Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem rohrförmigen Grundkörper (1) , der mit mehreren Anschlussöffnungen (4) ausgestattet ist, dadurch gekennzeichnet, dass der Innenraum des rohrförmigen Grundkörpers (1) im Bereich der Anschlussöffnungen (4) eben ausgebildet ist.4. High-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a tubular base body (1) which is equipped with a plurality of connection openings (4), characterized in that the interior of the tubular Base body (1) is flat in the area of the connection openings (4).
5. Verfahren zur Herstellung eines Kraftstoffhochdruckspeichers nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, dass der rohrförmige Grundkörper (1) im Bereich der Anschlussöffnungen (4) so nach innen verformt wird, dass er nach innen vorspringt, und dass der nach innen vorspringende Bereich (9) materialabtragend bearbeitet wird, um den Innendurchmesser des rohrförmigen Grundkörpers (1) im Bereich der Anschlussöff ungen (4) zu erweitern.5. A method for producing a high-pressure fuel accumulator according to one of claims 3 or 4, characterized in that the tubular base body (1) is deformed inwards in the region of the connection openings (4) in such a way that it projects inwards and that the inwards projecting Area (9) is machined to remove the inner diameter of the tubular base body (1) in the area of the connection openings (4).
6. Verfahren zum Herstellen eines Kraftstoffhochdruckspeichers nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, dass der Innenraum des rohrförmigen Grundkörpers (1) im Bereich der Anschlussöffnungen (4) mit Hilfe eines elektrochemischen Abtragverfahrens bearbeitet wird. 6. A method for producing a high-pressure fuel accumulator according to one of claims 3 or 4, characterized in that the interior of the tubular base body (1) in the region of the connection openings (4) is processed with the aid of an electrochemical removal method.
EP00979428A 1999-10-16 2000-10-13 High-pressure fuel accumulator and a method for producing the same Expired - Lifetime EP1144853B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19949962 1999-10-16
DE19949962A DE19949962A1 (en) 1999-10-16 1999-10-16 Fuel high pressure storage for a common-rail fuel injection system of IC engine with hollow basic body which is equipped with several connection openings
PCT/DE2000/003606 WO2001029405A1 (en) 1999-10-16 2000-10-13 High-pressure fuel accumulator and a method for producing the same

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EP1144853A1 true EP1144853A1 (en) 2001-10-17
EP1144853B1 EP1144853B1 (en) 2006-10-25

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EP (1) EP1144853B1 (en)
JP (1) JP2003512560A (en)
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WO (1) WO2001029405A1 (en)

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Publication number Publication date
EP1144853B1 (en) 2006-10-25
ES2275562T3 (en) 2007-06-16
US6612289B1 (en) 2003-09-02
JP2003512560A (en) 2003-04-02
WO2001029405A1 (en) 2001-04-26
DE19949962A1 (en) 2001-04-26
DE50013661D1 (en) 2006-12-07

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