EP2960486A1 - Method for reducing the tension at a connection between two channels which open into one another - Google Patents

Method for reducing the tension at a connection between two channels which open into one another Download PDF

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Publication number
EP2960486A1
EP2960486A1 EP15170032.5A EP15170032A EP2960486A1 EP 2960486 A1 EP2960486 A1 EP 2960486A1 EP 15170032 A EP15170032 A EP 15170032A EP 2960486 A1 EP2960486 A1 EP 2960486A1
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EP
European Patent Office
Prior art keywords
channel
channels
pocket
junction
reducing
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Granted
Application number
EP15170032.5A
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German (de)
French (fr)
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EP2960486B1 (en
Inventor
Gerhard Girlinger
Marcela Haberlova
Horst Rosenkranz
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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
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation

Definitions

  • the invention relates to a method for reducing the stress on an intersection of two channels merging into one another in a body made of a metallic material, wherein a high-pressure medium is guided in the channels, and a first channel opens into a second channel. Furthermore, the invention relates to a device which causes a reduction in the voltage at an intersection of two merging channels.
  • annular recess is recessed, the Alternatively, it may be formed in the form of two opposite kidney-shaped depressions.
  • the circular or kidney-shaped depressions have in common that they are difficult to manufacture and at least partially can only be produced by a very expensive etching process.
  • the invention is based on the object of specifying a method for reducing the voltage of an intersection of two channels which merge into one another, which, with simple manufacturability, effectively reduces the stresses or shifts them into system-uncritical regions. Furthermore, a corresponding device is provided, with which the voltage is reduced at an intersection.
  • a pocket is arranged on both sides of an opening of the second channel in the first channel.
  • These two pockets can be made much easier compared to an annular recess or two kidney-shaped depressions and thereby ensure a reliable reduction or displacement of stresses in non-systemic areas outside the intersection.
  • the pockets can be arranged in a basically axial orientation parallel or inclined to the first channel on both sides of the junction of the second channel.
  • the respective pocket is mechanically incorporated into the body. Mechanical incorporation is precise, accurate and reproducible.
  • the respective pocket is incorporated into the body by means of a ball drill.
  • a ball drill in a first processing form of the ball drill inclined or parallel to the first channel directly adjacent to the junction or in the region of Junction formed second channel intersection to the first channel in the body aligned and introduced from a mouth end of the first channel into an area below the intersection in the body.
  • a second machining shape provides to drive a tool having an angular drive in the first channel up to the level of the junction of the second channel and then move the ball drill radially to the intersection, so as to manufacture the two pockets.
  • the production of the two bags is preferably carried out sequentially and the pockets can be produced by means of a program-controlled machine tool.
  • the pockets can also be etched into the body, which is preferably done by an electrochemical etching process. It should be noted that the pockets of the invention are much easier than the known from the prior art kidney-shaped depressions are etched into the body.
  • the first channel is a longitudinal bore, which is embedded in the body.
  • the second channel is an inlet bore, which can preferably open tangentially but also at an angle of 0 ° (normal to the longitudinal bore) in the axially bored in the body longitudinal bore.
  • a corresponding device which is designed to reduce the voltage at an intersection, is formed by (axial) pockets arranged on both sides of the junction of the second channel in the first channel.
  • a corresponding body, in which the channels are embedded can basically be any high-pressure medium of leading bodies.
  • the body is preferably part of an injector of an injection system, in particular of a fuel injection system.
  • the fuel injection system is preferably designed as a common-rail injection system, wherein the injector is taken from a high-pressure accumulator and there under a pressure of up to 3000bar standing fuel and injected into an associated combustion chamber of an internal combustion engine.
  • the inventive method for increasing the life of the injector is particularly advantageous applicable.
  • the shaping according to the invention of the intersection achieves a radial expansion of the longitudinal bore forming a valve space, which results in the local stress values in the intersecting area being reduced or displaced and distributed over a larger "area", as a result of which the stress state in a desired way is changed.
  • the reduction of the voltage values results from the fact that the pockets generate an increased pressure area in the radial direction.
  • the resulting force counteracts the change in curvature of the intersection caused by the circumferential stresses of the axial longitudinal bore. This ensures that the maximum stress is no longer in the range of the intersection lines, but migrates into the smooth area of the inlet bore.
  • FIG. 1 shows in a schematic side view of an injector 1, which is part of an injection system designed as a fuel injection system.
  • the fuel injection system is designed in particular as a common rail injection system for injecting a fuel, in particular diesel fuel, into assigned combustion chambers of an internal combustion engine.
  • a fuel pressure of up to 3000 bar.
  • the injector 1 has a base body 2, which is screwed by means of a clamping nut 3 with a nozzle body 4 receiving a nozzle needle.
  • the nozzle body 4 protrudes at least with a nozzle body support 5 in a combustion chamber of the internal combustion engine and the nozzle body tip has spray openings 6, controlled by the controlled liquid medium in the form of fuel in an associated combustion chamber can be injected.
  • the fuel is introduced via a high-pressure port 7 into a high-pressure bore 8 embedded in the main body 2.
  • the high-pressure bore 8 communicates with a second channel 9, which opens into a first channel 10 in a body 11 of the injector 1 made of a metallic material.
  • the body 11 is a body part of the injector 1 and may be the main body 2 or a body part disposed between the main body 2 and the nozzle body 4. In this context, it is also possible that the clamping nut 3 is screwed above the body 11 with the base body 2.
  • the first channel is in the illustrated embodiment, a substantially cylindrically shaped valve chamber, with the associated valve, the opening and closing of the injector 1 is set, and thus the amount of fuel discharged through the spray openings 6 is determined.
  • the junction 12 of the second channel 9 in the first channel 10 forms an intersection, wherein in the region on both sides of the junction 12 pockets 13a, 13b are arranged.
  • the second channel 9 opens in the illustrated embodiment tangentially at an angle W3 (for example, about 10 °) in the first channel 10 a.
  • the first pocket 13a is at an angle W1 (for example, about 20 °) to a Coordinate system arranged while the bag 13b at an angle W2 (for example, 110 °) is arranged to the first pocket 13a.
  • the pocket 13a is aligned with the junction 12 so that the channel wall 14a projects up to the first channel 1, while the channel wall 14b of the second channel 9 on the opposite side at an obtuse angle even before the connection to the first channel 1 in the bag 13b passes.
  • FIG. 3 shown longitudinal section through the body 11 shows the first channel 10 and the tangential opening into the first channel 10 second channel 9.
  • pockets 13a, 13b in the body 11th are incorporated, which are incorporated by means of a round drill parallel or at least approximately parallel to the first channel 10 in the body 11.
  • the pockets 13a, 13b are incorporated in the embodiment to below the junction 12 in the body 11, but can also be performed only up to the area of the actual junction 12.
  • the pockets 13a, 13b by means of a tool having an angle drive only in the region of the height of the junction 12 in the body 11 as spherical segment-shaped pockets 13a, 13b, which is shown by dashed lines in the region of the pocket 13bb.

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

Abstract

Verfahren und Vorrichtung zur Reduzierung der Spannung an einer Verschneidung zweier ineinander einmündender Kanäle 9, 10 in einen aus einem metallischen Werkstoff gefertigten Körper 11, wobei in den Kanälen 9, 10 ein unter Hochdruck stehendes Medium geführt ist, und ein zweiter Kanal 9 in einen ersten Kanal 10 einmündet. Erfindungsgemäß wird ein Verfahren zur Reduzierung der Spannung einer Verschneidung zweier ineinander einmündender Kanäle 9, 10 angegeben, dass bei einfacher Fertigbarkeit die Spannungen wirkungsvoll verringert beziehungsweise in systemunkritische Bereiche verlagert Erreicht wird dies dadurch, dass beidseits der Einmündung 12 des zweiten Kanals 9 in den ersten Kanal 10 eine Tasche 13a, 13b, 13bb angeordnet ist.

Figure imgaf001
Method and device for reducing the stress on a blending of two channels 9, 10 merging into one another into a body 11 made of a metallic material, wherein a medium under high pressure is guided in the channels 9, 10, and a second channel 9 into a first Channel 10 opens. According to the invention, a method for reducing the voltage of an intersection between two channels 9, 10 is indicated that with simple manufacturability, the voltages effectively reduced or shifted in non-systemic areas This is achieved by the fact that both sides of the junction 12 of the second channel 9 in the first channel 10, a pocket 13a, 13b, 13bb is arranged.
Figure imgaf001

Description

Die Erfindung betrifft ein Verfahren zur Reduzierung der Spannung an einer Verschneidung zweier ineinander einmündenden Kanäle in einem aus einem metallischen Werkstoff gefertigten Körper, wobei in den Kanälen ein unter Hochdruck stehendes Medium geführt ist, und ein erster Kanal in einen zweiten Kanal einmündet. Weiterhin betrifft die Erfindung eine Vorrichtung, die eine Reduzierung der Spannung an einer Verschneidung zweier ineinander einmündenden Kanäle bewirkt.The invention relates to a method for reducing the stress on an intersection of two channels merging into one another in a body made of a metallic material, wherein a high-pressure medium is guided in the channels, and a first channel opens into a second channel. Furthermore, the invention relates to a device which causes a reduction in the voltage at an intersection of two merging channels.

Stand der TechnikState of the art

Ein derartiges Verfahren und eine entsprechende Vorrichtung zur Reduzierung der Spannung an einer Verschneidung zweier ineinander einmündender Kanäle ist aus der EP 0 717 227 A2 bekannt. Dieses Dokument offenbart zunächst einmal konventionell ausgebildete Verschneidungen zweier ineinander einmündender Kanäle, die ein einem Körper, der ein Teil eines Kraftstoffinjektors ist. Beispielsweise ist im Bereich der Einmündung eines ersten Kanals in einen zweiten Kanal im Bereich der Einmündungsstelle des zweiten Kanals in den ersten Kanal eine den ersten Kanal umgebende Ringnut in den Körper eingelassen. Eine weitere konventionelle Lösung ist das Einbringen einer ringförmigen Ausnehmung in den Körper, wobei die ringförmige Ausnehmung die Einmündungsstelle des zweiten Kanals in den ersten Kanal umgibt. Ein in dem Dokument beschriebenes neuartiges Verfahren zur Reduzierung der Spannungen an der entsprechenden Verschneidung sieht vor, dass um die Einmündung des zweiten Kanals in den ersten Kanal beabstandet zu der Einmündungsstelle eine kreisringförmige Einsenkung eingelassen ist, die alternativ auch in Form von zwei gegenüberliegenden nierenförmig ausgebildeten Einsenkungen ausgebildet sein kann. Den kreisringförmigen oder nierenförmigen Einsenkungen ist es gemeinsam, dass diese schwierig zu fertigen sind und zumindest teilweise nur durch ein sehr aufwendiges Ätzverfahren herstellbar sind.Such a method and a corresponding device for reducing the voltage at a intersection of two merging channels is out of EP 0 717 227 A2 known. This document firstly discloses conventionally formed intersections of two intermeshing channels, which is a body which is part of a fuel injector. For example, in the region of the confluence of a first channel into a second channel in the region of the point of confluence of the second channel into the first channel, an annular groove surrounding the first channel is embedded in the body. Another conventional solution is to introduce an annular recess into the body, the annular recess surrounding the junction of the second channel into the first channel. A described in the document novel method for reducing the stresses at the corresponding intersection provides that around the mouth of the second channel in the first channel spaced from the junction an annular recess is recessed, the Alternatively, it may be formed in the form of two opposite kidney-shaped depressions. The circular or kidney-shaped depressions have in common that they are difficult to manufacture and at least partially can only be produced by a very expensive etching process.

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zur Reduzierung der Spannung einer Verschneidung zweier ineinander einmündender Kanäle anzugeben, das bei einfacher Fertigbarkeit die Spannungen wirkungsvoll verringert beziehungsweise in systemunkritische Bereiche verlagert. Weiterhin ist eine entsprechende Vorrichtung anzugeben, mit der die Spannung an einer Verschneidung reduziert wird.The invention is based on the object of specifying a method for reducing the voltage of an intersection of two channels which merge into one another, which, with simple manufacturability, effectively reduces the stresses or shifts them into system-uncritical regions. Furthermore, a corresponding device is provided, with which the voltage is reduced at an intersection.

Offenbarung der ErfindungDisclosure of the invention

Diese Aufgabe wird dadurch gelöst, dass beidseits einer Einmündung des zweiten Kanals in den ersten Kanal eine Tasche angeordnet ist. Diese beiden Taschen können gegenüber einer kreisringförmigen Einsenkung oder zweier nierenförmigen Einsenkungen wesentlich einfacher gefertigt werden und gewährleisten dabei eine zuverlässige Reduzierung beziehungsweise Verlagerung von Spannungen in systemunkritische Bereiche außerhalb der Verschneidung. Durch dieses Verfahren und eine entsprechende Vorrichtung wird die Lebensdauer des entsprechenden Bauteils auf einen geforderten Anspruch erhöht. Die Taschen können in grundsätzlich axialer Ausrichtung parallel oder aber geneigt zu dem ersten Kanal beidseits der Einmündung es zweiten Kanals angeordnet sein.This object is achieved in that a pocket is arranged on both sides of an opening of the second channel in the first channel. These two pockets can be made much easier compared to an annular recess or two kidney-shaped depressions and thereby ensure a reliable reduction or displacement of stresses in non-systemic areas outside the intersection. By this method and a corresponding device, the life of the corresponding component is increased to a required claim. The pockets can be arranged in a basically axial orientation parallel or inclined to the first channel on both sides of the junction of the second channel.

In Weiterbildung der Erfindung ist die jeweilige Tasche mechanisch in den Körper eingearbeitet. Eine mechanische Einarbeitung ist präzise, lagegenau und reproduzierbar umsetzbar.In a further development of the invention, the respective pocket is mechanically incorporated into the body. Mechanical incorporation is precise, accurate and reproducible.

In weiterer Ausgestaltung der Erfindung ist die jeweilige Tasche in den Körper mittels eines Kugelbohrers eingearbeitet. Dabei wird in einer ersten Bearbeitungsform der Kugelbohrer geneigt oder parallel zu dem ersten Kanal direkt angrenzend an die Einmündung beziehungsweise im Bereich der Einmündung gebildeten Verschneidung des zweiten Kanals zu dem ersten Kanal in dem Körper ausgerichtet und von einem Mündungsende des ersten Kanals bis in einen Bereich unterhalb der Verschneidung in den Körper eingeführt.In a further embodiment of the invention, the respective pocket is incorporated into the body by means of a ball drill. In this case, in a first processing form of the ball drill inclined or parallel to the first channel directly adjacent to the junction or in the region of Junction formed second channel intersection to the first channel in the body aligned and introduced from a mouth end of the first channel into an area below the intersection in the body.

Eine zweite Bearbeitungsform sieht vor, ein Werkzeug, das einen Winkelantrieb aufweist, in den ersten Kanal bis in Höhe der Einmündung des zweiten Kanals einzufahren und dann den Kugelbohrer radial auf die Verschneidung zuzubewegen, um so die beiden Taschen zu fertigen. Die Fertigung der beiden Taschen erfolgt vorzugsweise aufeinanderfolgend und die Taschen können mittels einer programmgesteuerten Werkzeugmaschine hergestellt werden.A second machining shape provides to drive a tool having an angular drive in the first channel up to the level of the junction of the second channel and then move the ball drill radially to the intersection, so as to manufacture the two pockets. The production of the two bags is preferably carried out sequentially and the pockets can be produced by means of a program-controlled machine tool.

Alternativ zu der mechanischen Einarbeitung der Taschen in den Körper können diese auch in den Körper eingeätzt werden, was vorzugsweise durch ein elektrochemisches Ätzverfahren erfolgt. Dabei ist zu berücksichtigen, dass die erfindungsgemäßen Taschen wesentlich einfacher als die aus dem Stand der Technik bekannten nierenförmigen Einsenkungen in den Körper einätzbar sind.As an alternative to the mechanical incorporation of the pockets into the body, they can also be etched into the body, which is preferably done by an electrochemical etching process. It should be noted that the pockets of the invention are much easier than the known from the prior art kidney-shaped depressions are etched into the body.

In Weiterbildung der Erfindung ist der erste Kanal eine Längsbohrung, die in den Körper eingelassen ist. Der zweite Kanal ist eine Zulaufbohrung, die vorzugsweise tangential aber auch unter einem Winkel von 0° (normal zu der Längsbohrung) in die axial in den Körper eingelassene Längsbohrung einmünden kann.In a further development of the invention, the first channel is a longitudinal bore, which is embedded in the body. The second channel is an inlet bore, which can preferably open tangentially but also at an angle of 0 ° (normal to the longitudinal bore) in the axially bored in the body longitudinal bore.

Eine entsprechende Vorrichtung, die zur Reduzierung der Spannung an einer Verschneidung ausgebildet ist, wird von beidseits der Einmündung des zweiten Kanals in den ersten Kanal angeordneten (axialen) Taschen gebildet. Ein entsprechender Körper, in den die Kanäle eingelassen sind, kann grundsätzlich ein beliebiger ein unter Hochdruck stehendes Medium führender Körper sein. Bevorzugt ist der Körper aber Teil eins Injektors eines Einspritzsystems, insbesondere eines Kraftstoffeinspritzsystems. Dabei ist das Kraftstoffeinspritzsystem bevorzugt als Common-Rail-Einspritzsystem ausgebildet, wobei mit dem Injektor aus einem Hochdruckspeicher und dort unter einem Druck von bis zu 3000bar stehender Kraftstoff entnommen wird und in einem zugeordneten Brennraum einer Brennkraftmaschine eingespritzt wird. An einem solchen Injektor ist das erfindungsgemäße Verfahren zur Steigerung der Lebensdauer des Injektors besonders vorteilhaft anwendbar.A corresponding device, which is designed to reduce the voltage at an intersection, is formed by (axial) pockets arranged on both sides of the junction of the second channel in the first channel. A corresponding body, in which the channels are embedded, can basically be any high-pressure medium of leading bodies. However, the body is preferably part of an injector of an injection system, in particular of a fuel injection system. In this case, the fuel injection system is preferably designed as a common-rail injection system, wherein the injector is taken from a high-pressure accumulator and there under a pressure of up to 3000bar standing fuel and injected into an associated combustion chamber of an internal combustion engine. At Such an injector, the inventive method for increasing the life of the injector is particularly advantageous applicable.

Zusammenfassend wird durch die erfindungsgemäße Formgebung der Verschneidung eine der radialen Aufweitung der einen Ventilraum bildenden Längsbohrung entgegenwirkenden Spannung erreicht, was dazu führt, dass die lokalen Spannungswerte im Verschneidungsbereich reduziert beziehungsweise verschoben und auf ein größeres "Gebiet" verteilt werden, wodurch im Ergebnis der Spannungszustand in einer gewünschten Art und Weise verändert wird. Die Reduktion der Spannungswerte resultiert aus der Tatsache, dass die Taschen eine vergrößerte Druckfläche in radialer Richtung erzeugen. Die dadurch entstehende Kraft wirkt der Krümmungsänderung der Verschneidung, hervorgerufen durch die Umfangsspannungen der axialen Längsbohrung, entgegen. Dadurch wird erreicht, dass das Spannungsmaximum nicht mehr im Bereich der Verschneidungslinien liegt, sondern in den glatten Bereich der Zulaufbohrung wandert.In summary, the shaping according to the invention of the intersection achieves a radial expansion of the longitudinal bore forming a valve space, which results in the local stress values in the intersecting area being reduced or displaced and distributed over a larger "area", as a result of which the stress state in a desired way is changed. The reduction of the voltage values results from the fact that the pockets generate an increased pressure area in the radial direction. The resulting force counteracts the change in curvature of the intersection caused by the circumferential stresses of the axial longitudinal bore. This ensures that the maximum stress is no longer in the range of the intersection lines, but migrates into the smooth area of the inlet bore.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figures embodiment is described in detail.

Es zeigen:

Figur 1
eine schematische Seitenansicht eines als Kraftstoffinjektor ausgebildeten Körpers mit einer Darstellung einer Verschneidung zweier Kanäle,
Figur 2
einen Querschnitt durch die Verschneidung zweier Kanäle gemäß Figur 1 und
Figur 3
einen Längsschnitt durch einen Injektor, der beidseits der Einmündung des zweiten Kanals in der ersten Kanal Taschen aufweist, wobei die Taschen mittels eines Kugelbohrers in den Körper eingearbeitet worden sind.
Show it:
FIG. 1
FIG. 2 a schematic side view of a body designed as a fuel injector with a representation of an intersection of two channels, FIG.
FIG. 2
a cross section through the intersection of two channels according to FIG. 1 and
FIG. 3
a longitudinal section through an injector having pockets on both sides of the junction of the second channel in the first channel, wherein the pockets have been incorporated by means of a ball drill in the body.

Figur 1 zeigt in einer schematischen Seitenansicht einen Injektor 1, der Teil eines als Kraftstoffeinspritzsystem ausgebildeten Einspritzsystems ist. Das Kraftstoffeinspritzsystem ist insbesondere als Common-Rail-Einspritzsystem zur Einspritzung eines Kraftstoffs, insbesondere Dieselkraftstoff, in zugeordnete Brennräume einer Brennkraftmaschine ausgelegt. In dem Kraftstoffeinspritzsystem herrscht ein Kraftstoffdruck von bis zu 3000 bar. Der Injektor 1 weist einen Grundkörper 2 auf, auf, der mittels einer Spannmutter 3 mit einem eine Düsennadel aufnehmenden Düsenkörper 4 verschraubt ist. Der Düsenkörper 4 ragt zumindest mit einer Düsenkörperstütze 5 in einem Brennraum der Brennkraftmaschine hinein und die Düsenkörperspitze weist Spritzöffnungen 6 auf, durch die gesteuert ein flüssiges Medium in Form von Kraftstoff gesteuert in einen zugeordneten Brennraum einspritzbar ist. FIG. 1 shows in a schematic side view of an injector 1, which is part of an injection system designed as a fuel injection system. The fuel injection system is designed in particular as a common rail injection system for injecting a fuel, in particular diesel fuel, into assigned combustion chambers of an internal combustion engine. In the fuel injection system there is a fuel pressure of up to 3000 bar. The injector 1 has a base body 2, which is screwed by means of a clamping nut 3 with a nozzle body 4 receiving a nozzle needle. The nozzle body 4 protrudes at least with a nozzle body support 5 in a combustion chamber of the internal combustion engine and the nozzle body tip has spray openings 6, controlled by the controlled liquid medium in the form of fuel in an associated combustion chamber can be injected.

Der Kraftstoff wird über einen Hochdruckanschluss 7 in eine in den Grundkörper 2 eingelassene Hochdruckbohrung 8 eingeleitet. Die Hochdruckbohrung 8 steht mit einem zweiten Kanal 9 in Verbindung, der in einen ersten Kanal 10 in einem aus einem metallischen Werkstoff gefertigten Körper 11 des Injektors 1 einmündet. Der Körper 11 ist ein Körperteil des Injektors 1 und kann der Grundkörper 2 oder ein zwischen dem Grundkörper 2 und dem Düsenkörper 4 angeordnetes Körperteil sein. In diesem Zusammenhang ist es auch möglich, dass die Spannmutter 3 oberhalb des Körpers 11 mit dem Grundkörper 2 verschraubt ist.The fuel is introduced via a high-pressure port 7 into a high-pressure bore 8 embedded in the main body 2. The high-pressure bore 8 communicates with a second channel 9, which opens into a first channel 10 in a body 11 of the injector 1 made of a metallic material. The body 11 is a body part of the injector 1 and may be the main body 2 or a body part disposed between the main body 2 and the nozzle body 4. In this context, it is also possible that the clamping nut 3 is screwed above the body 11 with the base body 2.

Der erste Kanal ist in den dargestellten Ausführungsbeispiel ein im Wesentlichen zylindrisch ausgebildeter Ventilraum, wobei mit dem zugeordneten Ventil das Öffnen und Schließen des Injektors 1 eingestellt wird und somit die über die Spritzöffnungen 6 abgegebene Brennstoffmenge bestimmt wird.The first channel is in the illustrated embodiment, a substantially cylindrically shaped valve chamber, with the associated valve, the opening and closing of the injector 1 is set, and thus the amount of fuel discharged through the spray openings 6 is determined.

In dem Querschnitt gemäß Figur 2 ist die Einmündung des zweiten Kanals 9 in den ersten Kanal 10 in dem Körper 11 dargestellt. Die Einmündung 12 des zweiten Kanals 9 in den ersten Kanal 10 bildet eine Verschneidung, wobei im Bereich beidseits der Einmündung 12 Taschen 13a, 13b angeordnet sind. Der zweite Kanal 9 mündet in dem dargestellten Ausführungsbeispiel tangential unter einen Winkel W3 (beispielsweise ca. 10°) in den ersten Kanal 10 ein. Die erste Tasche 13a ist unter einem Winkel W1 (beispielsweise ca. 20°) zu einem Koordinatensystem angeordnet, während die Tasche 13b unter einem Winkel W2 (beispielsweise 110°) zu der ersten Tasche 13a angeordnet ist. Weiterhin ist die Tasche 13a so zu der Einmündung 12 ausgerichtet, dass die Kanalwand 14a bis zu dem ersten Kanal 1 ragt, während die Kanalwand 14b des zweiten Kanals 9 auf der gegenüberliegenden Seite unter einem stumpfen Winkel schon vor der Anbindung an den ersten Kanal 1 in die Tasche 13b übergeht.In the cross section according to FIG. 2 the confluence of the second channel 9 into the first channel 10 in the body 11 is shown. The junction 12 of the second channel 9 in the first channel 10 forms an intersection, wherein in the region on both sides of the junction 12 pockets 13a, 13b are arranged. The second channel 9 opens in the illustrated embodiment tangentially at an angle W3 (for example, about 10 °) in the first channel 10 a. The first pocket 13a is at an angle W1 (for example, about 20 °) to a Coordinate system arranged while the bag 13b at an angle W2 (for example, 110 °) is arranged to the first pocket 13a. Furthermore, the pocket 13a is aligned with the junction 12 so that the channel wall 14a projects up to the first channel 1, while the channel wall 14b of the second channel 9 on the opposite side at an obtuse angle even before the connection to the first channel 1 in the bag 13b passes.

Der in Figur 3 dargestellte Längsschnitt durch den Körper 11 zeigt den ersten Kanal 10 und den tangential in den ersten Kanal 10 einmündenden zweiten Kanal 9. Rechts und links benachbart zu der Einmündung 12 des zweiten Kanals 9 in den ersten Kanal 10 sind Taschen 13a, 13b in den Körper 11 eingearbeitet, die mittels eines Rundbohrers parallel oder zumindest angenähert parallel zu dem ersten Kanal 10 in den Körper 11 eingearbeitet sind. Die Taschen 13a, 13b sind in den Ausführungsbeispiel bis unterhalb der Einmündung 12 in den Körper 11 eingearbeitet, können aber auch nur bis in den Bereich der eigentlichen Einmündung 12 geführt sein. Ebenfalls ist es möglich, die Taschen 13a, 13b durch ein einen Winkelantrieb aufweisendes Werkzeug nur im Bereich der Höhe der Einmündung 12 in den Körper 11 als kugelabschnittsförmige Taschen 13a, 13b auszubilden, was im Bereich der Tasche 13bb strichliniert dargestellt ist.The in FIG. 3 shown longitudinal section through the body 11 shows the first channel 10 and the tangential opening into the first channel 10 second channel 9. Right and left adjacent to the junction 12 of the second channel 9 in the first channel 10 are pockets 13a, 13b in the body 11th incorporated, which are incorporated by means of a round drill parallel or at least approximately parallel to the first channel 10 in the body 11. The pockets 13a, 13b are incorporated in the embodiment to below the junction 12 in the body 11, but can also be performed only up to the area of the actual junction 12. It is also possible to form the pockets 13a, 13b by means of a tool having an angle drive only in the region of the height of the junction 12 in the body 11 as spherical segment-shaped pockets 13a, 13b, which is shown by dashed lines in the region of the pocket 13bb.

Claims (11)

Verfahren zur Reduzierung der Spannung an einer Verschneidung zweier ineinander einmündender Kanäle (9, 10) in einen aus einem metallischen Werkstoff gefertigten Körper (11), wobei in den Kanälen (9, 10) ein unter Hochdruck stehendes Medium geführt ist, und der zweite Kanal (9) in einen ersten Kanal (10) einmündet,
dadurch gekennzeichnet, dass beidseits der Einmündung (12) des zweiten Kanals (9) in den ersten Kanal (10) eine Tasche (13a, 13b, 13bb) angeordnet ist.A method for reducing the stress on an intersection of two channels (9, 10) merging into a body (11) made of a metallic material, wherein a high-pressure medium is guided in the channels (9, 10), and the second channel (9) opens into a first channel (10),
characterized in that on both sides of the junction (12) of the second channel (9) in the first channel (10) a pocket (13a, 13b, 13bb) is arranged. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass die Tasche (13a, 13b, 13bb) mechanisch in den Körper (11) eingearbeitet ist.Method according to claim 1,
characterized in that the pocket (13a, 13b, 13bb) is mechanically incorporated in the body (11). Verfahren nach Anspruch 2,
dadurch gekennzeichnet, dass die Tasche (13a, 13b, 13bb) in den Körper (11) mittels eines Kugelbohrers eingearbeitet ist.Method according to claim 2,
characterized in that the pocket (13a, 13b, 13bb) is incorporated in the body (11) by means of a ball drill. Verfahren nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, dass die Tasche (13a, 13b, 13bb) in den Körper (11) eingeätzt, vorzugsweise durch ein elektrochemisches Verfahren eingeätzt ist.Method according to one of the preceding claims,
characterized in that the pocket (13a, 13b, 13bb) is etched into the body (11), preferably etched by an electrochemical process. Verfahren nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, dass die Tasche (13bb) zumindest angenähert kugelabschnittsförmig ausgebildet ist.Method according to one of the preceding claims,
characterized in that the pocket (13bb) is formed at least approximately spherical segment-shaped. Verfahren nach einem vorherigen Ansprüche,
dadurch gekennzeichnet, dass der erste Kanal (10) eine Längsbohrung in dem Körper (11) ist.Method according to a preceding claim,
characterized in that the first channel (10) is a longitudinal bore in the body (11). Verfahren nach einem vorherigen Ansprüche,
dadurch gekennzeichnet, dass der zweite Kanal (9) eine Zulaufbohrung ist.Method according to a preceding claim,
characterized in that the second channel (9) is an inlet bore. Verfahren nach Anspruch 7,
dadurch gekennzeichnet, dass der zweite Kanal (9) zumindest angenähert tangential in den axial in den Körper (11) eingelassenen ersten Kanal (10) einmündet.Method according to claim 7,
characterized in that the second channel (9) opens at least approximately tangentially in the axially in the body (11) embedded first channel (10). Vorrichtung zur Reduzierung der Spannung an einer Verschneidung zweier ineinander einmündender Kanäle (9, 10) in einen aus einem metallischen Werkstoff gefertigten Körper (11), wobei in den Kanälen (9, 10) ein unter Hochdruck stehendes Medium geführt ist, und der zweite Kanal (9) in einen ersten Kanal (10) einmündet,
dadurch gekennzeichnet, dass die Vorrichtung von beidseits der Einmündung (12) des zweiten Kanals (9) in den ersten Kanal (10) angeordneten Taschen (13a, 13b, 13bb) gebildet ist.Device for reducing the stress on a blending of two channels (9, 10) merging into one another into a body (11) made of a metallic material, wherein a medium under high pressure is guided in the channels (9, 10), and the second channel (9) opens into a first channel (10),
characterized in that the device of both sides of the junction (12) of the second channel (9) in the first channel (10) arranged pockets (13a, 13b, 13bb) is formed. Vorrichtung nach Anspruch 9,
dadurch gekennzeichnet, dass der Körper (11) ein Körperteil eines Injektors (1) eines Einspritzsystems, insbesondere eines Kraftstoffeinspritzsystems ist.Device according to claim 9,
characterized in that the body (11) is a body part of an injector (1) of an injection system, in particular of a fuel injection system. Vorrichtung nach Anspruch 9 oder 10,
dadurch gekennzeichnet, dass der erste Kanal (9) ein einen Ventilraum bildende Längsbohrung und der zweite Kanal (10) eine in den Ventilraum einmündende Zulaufbohrung ist.Device according to claim 9 or 10,
characterized in that the first channel (9) is a longitudinal bore forming a valve space and the second channel (10) is an inlet bore opening into the valve chamber.
EP15170032.5A 2014-06-25 2015-06-01 Method for reducing the tension at a connection between two channels which open into one another Active EP2960486B1 (en)

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Application Number Priority Date Filing Date Title
DE102014212194.9A DE102014212194A1 (en) 2014-06-25 2014-06-25 Method for reducing the voltage at an intersection of two merging channels

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0717227A2 (en) 1994-12-16 1996-06-19 Perkins Limited A method for reducing stress at a junction of high pressure fluid flow passages in a body, and a junction formed thereby
EP1304476A2 (en) * 2001-10-20 2003-04-23 Robert Bosch Gmbh High pressure resistant injector body
WO2003036075A1 (en) * 2001-10-20 2003-05-01 Robert Bosch Gmbh High-pressure accumulator such as high-pressure fuel accumulator
DE102007018471A1 (en) * 2007-04-19 2008-10-23 Robert Bosch Gmbh Intersection between a high pressure chamber and a high pressure channel
DE102009004680A1 (en) * 2009-01-12 2010-07-15 L'orange Gmbh Fuel injection nozzle, has shaft with peripheral regions, which extend over length of shaft from accommodation space into area of connection piece, where space has contour that is convexly bulged in body and enters into borehole
EP2299102A1 (en) * 2009-09-07 2011-03-23 OMT Officine Meccaniche Torino S.p.A. High-pressure fuel accumulator for common-rail injection systems
DE102010022909A1 (en) * 2010-06-07 2011-12-08 Continental Automotive Gmbh Fuel injector, has channel arrangement including two channels, and recess provided in intersecting portion of channels in body by electrochemical removal, where recess is formed in rectangular shape in sectional plane
DE102011101770A1 (en) * 2011-05-17 2012-08-02 L'orange Gmbh Assembly has solid body and intersection of high-pressure fluid channel with another high-pressure fluid channel is formed in solid body
DE102011079075A1 (en) * 2011-07-13 2013-01-17 Hirschvogel Umformtechnik Gmbh Inner pressure-loaded component for forming high pressure fuel rail for common-rail fuel injection system of combustion engine of vehicle, has relief notches extending over entire length of longitudinal cavity in axial direction

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0717227A2 (en) 1994-12-16 1996-06-19 Perkins Limited A method for reducing stress at a junction of high pressure fluid flow passages in a body, and a junction formed thereby
EP1304476A2 (en) * 2001-10-20 2003-04-23 Robert Bosch Gmbh High pressure resistant injector body
WO2003036075A1 (en) * 2001-10-20 2003-05-01 Robert Bosch Gmbh High-pressure accumulator such as high-pressure fuel accumulator
DE102007018471A1 (en) * 2007-04-19 2008-10-23 Robert Bosch Gmbh Intersection between a high pressure chamber and a high pressure channel
DE102009004680A1 (en) * 2009-01-12 2010-07-15 L'orange Gmbh Fuel injection nozzle, has shaft with peripheral regions, which extend over length of shaft from accommodation space into area of connection piece, where space has contour that is convexly bulged in body and enters into borehole
EP2299102A1 (en) * 2009-09-07 2011-03-23 OMT Officine Meccaniche Torino S.p.A. High-pressure fuel accumulator for common-rail injection systems
DE102010022909A1 (en) * 2010-06-07 2011-12-08 Continental Automotive Gmbh Fuel injector, has channel arrangement including two channels, and recess provided in intersecting portion of channels in body by electrochemical removal, where recess is formed in rectangular shape in sectional plane
DE102011101770A1 (en) * 2011-05-17 2012-08-02 L'orange Gmbh Assembly has solid body and intersection of high-pressure fluid channel with another high-pressure fluid channel is formed in solid body
DE102011079075A1 (en) * 2011-07-13 2013-01-17 Hirschvogel Umformtechnik Gmbh Inner pressure-loaded component for forming high pressure fuel rail for common-rail fuel injection system of combustion engine of vehicle, has relief notches extending over entire length of longitudinal cavity in axial direction

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DE102014212194A1 (en) 2015-12-31

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