EP1114252B1 - High pressure fuel accumulator with prestressed welded connecting socket for a fuel injection system of internal combustion engines - Google Patents

High pressure fuel accumulator with prestressed welded connecting socket for a fuel injection system of internal combustion engines Download PDF

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Publication number
EP1114252B1
EP1114252B1 EP00943620A EP00943620A EP1114252B1 EP 1114252 B1 EP1114252 B1 EP 1114252B1 EP 00943620 A EP00943620 A EP 00943620A EP 00943620 A EP00943620 A EP 00943620A EP 1114252 B1 EP1114252 B1 EP 1114252B1
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EP
European Patent Office
Prior art keywords
housing
pressure fuel
bore
connection piece
connecting piece
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EP00943620A
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German (de)
French (fr)
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EP1114252A1 (en
Inventor
Kurt Frank
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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • the invention relates to a high-pressure fuel accumulator with welded connection piece according to the preamble of claim 1 for a fuel injection system for internal combustion engines.
  • the various components of a fuel injection system such as high-pressure fuel pump, high-pressure fuel storage and injectors are usually connected by hydraulic lines.
  • the sealing of these compounds is often carried out with the help of a pushed over the hydraulic line clamping nut, which is bolted to a liquid-tightly connected to the housing of the corresponding assembly connecting piece.
  • the high-pressure fuel accumulator has a plurality of such connecting pieces, which allow, for example, the fuel supply and the fuel drain into and out of the memory.
  • weld has two functions. First, it must establish the connection between the housing and the connecting piece and transfer all forces. Especially in modern fuel injection systems resulting from the high swelling pressures high swelling tensile stresses in the weld. Secondly, the weld must fulfill a sealing function, which entails additional requirements for the weld.
  • FR 2 762 050 A discloses a fuel distributor to which a connecting piece is fastened by means of friction welding. The resulting weld is in direct contact with the high-pressure fuel and ensures both the connection of the connecting piece and the fuel distributor and for the sealing of this connection.
  • the present invention has for its object to provide a high-pressure fuel accumulator with a housing and a connecting piece connected to this, which securely seal the high-pressure region of the housing and the connecting piece against the environment and in which the high-pressure region reliably against particles that may arise when connecting both components , is protected.
  • connection of the housing and the connecting piece takes the clamping element with its cylindrical sealing surface in conjunction with a correspondingly shaped housing the sealing of the located in the through hole fuel from the environment. Due to the spatial separation of the functions "holding” and “sealing" of the connecting piece, both the sealing surface and the connection of connecting piece and housing can be optimally designed.
  • the sealing surface prevents that when connecting connecting piece and housing accumulating weld splashes or shavings can get into the high-pressure area of the connecting piece or housing.
  • An embodiment of the invention provides that at a first end of the connecting piece concentric to the through hole, a cylindrical clamping element is arranged, wherein the clamping element has a through hole, that the bore has at its end facing the connection nozzle a recess which forms an interference fit with the clamping element ,
  • the interference fit seals the through-bore of the connecting piece and the bore of the housing against the environment and thus forms the sealing surface. Due to the surface pressure between the clamping element and the recess of the housing a good sealing effect is achieved.
  • a countersink is arranged, that the bore of the housing at its end facing the connection nozzle has a recess, and that between the connecting piece and the housing, a cylindrical clamping element is present forms with the reduction of the connection piece and the recess of the housing interference fits, so that connecting piece, clamping element and housing can be made of different, optimally adapted to the respective requirements materials and thus the reliability is improved.
  • the clamping element has the shape of an outer cylinder, so that the operating pressure of the fuel expands the sealing surface of the clamping element to the outside. As a result, the surface pressure between the sealing surface of the connecting piece and the recess of the housing is increased, which additionally increases the tightness of the connection.
  • At least one groove for receiving a sealing ring is present in the clamping element, so that the tightness is further increased by the sealing ring.
  • grooves for receiving at least one respective sealing ring are present in the recess of the housing and the reduction of the connecting piece, so that the clamping element can be particularly small dimensions, since the sealing rings takes over part of the function "densities" and not the clamping element Grooves for receiving a sealing ring is weakened.
  • a first embodiment of a connecting piece 1 is shown. Of the Connecting piece 1 is connected to a high-pressure fuel storage 2 by a circumferential weld 3.
  • the high-pressure fuel accumulator 2 has a bore 4, which is connected to a through hole 5 of the connecting piece 1 and the interior 6 of the high-pressure fuel accumulator 2.
  • this collar 7 acts as a stop in the direction of the longitudinal axis of the connecting piece 1 when it rests on a corresponding annular surface 8 of the high-pressure fuel accumulator 2.
  • a clamping element 10 of the connecting piece 1 projects into it.
  • the clamping element 10 forms with the recess 9 of the high-pressure fuel accumulator 2 an interference fit and thus seals the connection of high-pressure fuel storage 2 and pipe 1 against the environment.
  • the sealing surface is thus formed by the interference fit between the connecting piece 1 and high-pressure fuel storage 2.
  • a line is usually fastened by means of a union nut, also not shown.
  • FIG. 2 a second embodiment of a connecting piece 1 according to the invention is shown.
  • the reference numbers used correspond to those in FIG. 1.
  • the connecting piece 1 has a cylindrical countersink 13 into which the clamping element 10 designed as a separate component projects.
  • the Spannelenent 10 forms with the recess 9 of the high-pressure fuel storage 2 and the reduction 13 interference fits.
  • the diameters of the countersink 13 and the recess 9 do not have to be the same, as shown here.
  • the operating pressure of the fuel, not shown here, in the bore 4 and the through-bore 5 increases the tightness of the connection of the high-pressure fuel accumulator 2 and the connecting piece 1.
  • FIG. 1 On the right side of Fig. 3, an embodiment shown in FIG. 1 is shown with the difference that the clamping element 10 has a groove 14 in which a sealing ring 15 is located.
  • FIG. 3 On the left side of Fig. 3, an embodiment with a separate clamping element 10 according to FIG. 2 is shown, in which the clamping element 10 has two grooves 14 and two sealing rings 15.

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

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen Kraftstoffhochdruckspeicher mit angeschweißtem Anschlussstutzen nach dem Oberbegriff des Anspruchs 1 für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen.The invention relates to a high-pressure fuel accumulator with welded connection piece according to the preamble of claim 1 for a fuel injection system for internal combustion engines.

Die verschiedenen Baugruppen eines Kraftstoffeinspritzsystems, wie Kraftstoffhochdruckpumpe, Kraftstoffhochdruckspeicher und Einspritzdüsen, werden üblicherweise durch hydraulische Leitungen miteinander verbunden. Die Abdichtung dieser Verbindungen erfolgt oftmals mit Hilfe einer über die hydraulische Leitung geschobenen Spannmutter, welche mit einem mit dem Gehäuse der entsprechenden Baugruppe flüssigkeitsdicht verbundenen Anschlussstutzen verschraubt wird. Insbesondere der Kraftstoffhochdruckspeicher weist eine Vielzahl solcher Anschlussstutzen auf, die beispielsweise die Kraftstoffzufuhr und den Kraftstoffabfluss in und aus dem Speicher ermöglichen.The various components of a fuel injection system, such as high-pressure fuel pump, high-pressure fuel storage and injectors are usually connected by hydraulic lines. The sealing of these compounds is often carried out with the help of a pushed over the hydraulic line clamping nut, which is bolted to a liquid-tightly connected to the housing of the corresponding assembly connecting piece. In particular, the high-pressure fuel accumulator has a plurality of such connecting pieces, which allow, for example, the fuel supply and the fuel drain into and out of the memory.

Aus der DE 39 15 440 A1 und der DE 94 03 470 U und der DE 93 02 824 U sind Anschlussstutzen bekannt, die nach erfolgtem Einsetzen in eine Bohrung des Kraftstoffverteilers durch ein Werkzeug in radialer Richtung aufgeweitet werde. Der dadurch entstandene Querpesssitz dient der Verbindung und der Abdichtung von Kraftstoffverteiler und Anschlussstutzen.From DE 39 15 440 A1 and DE 94 03 470 U and DE 93 02 824 U connecting pieces are known, which will be widened by a tool in the radial direction after insertion into a bore of the fuel rail. The resulting transverse interference fit serves to connect and seal the fuel distributor and connecting piece.

Bekannt sind Anschlussstutzen, die an das Gehäuse angeschweißt werden. Nachteilig an den bekannten Schweißkonstruktionen ist, dass die Schweißnaht zwei Funktionen hat. Erstens muss sie die Verbindung zwischen Gehäuse und Anschlussstutzen herstellen und alle Kräfte übertragen. Vor allem bei modernen Kraftstoffeinspritzsystemen resultieren aus den hohen schwellenden Drücken hohe schwellende Zugspannungen in der Schweißnaht. Zweitens muss die Schweißnaht eine Dichtfunktion erfüllen, was zusätzliche Anforderungen an die Schweißnaht mit sich bringt.Are known connecting pieces, which are connected to the housing be welded. A disadvantage of the known weldments is that the weld has two functions. First, it must establish the connection between the housing and the connecting piece and transfer all forces. Especially in modern fuel injection systems resulting from the high swelling pressures high swelling tensile stresses in the weld. Secondly, the weld must fulfill a sealing function, which entails additional requirements for the weld.

So ist aus der FR 2 762 050 A ein Kraftstoffverteiler bekannt an den ein Anschlussstutzen mittels einer Reibschweißung befestigt wird. Die dabei entstehende Schweißnaht steht dabei in direktem Kontakt mit dem unter hohem Druck stehenden Kraftstoff und sorgt sowohl für die Verbindung von Anschlussstutzen und Kraftstoffverteiler als auch für die Abdichtung dieser Verbindung.Thus, FR 2 762 050 A discloses a fuel distributor to which a connecting piece is fastened by means of friction welding. The resulting weld is in direct contact with the high-pressure fuel and ensures both the connection of the connecting piece and the fuel distributor and for the sealing of this connection.

Ein weiterer Nachteil anderer bekannter Schweißkonstruktionen ist, dass beim Schweißvorgang Spritzer oder Schweißaufwürfe in den Hochdruckbereich der Leitung oder des Kraftstoffspeichers gelangen können, was Funktionsstörungen des Kraftstoffeinspritzsystems zur Folge haben kann. Dieser Nachteil wird bei einem aus der US 2, 015, 246 A bekannten Anschlussstutzen, der zum Anschweißen an ein Rohr geeignet ist, dadurch vermieden, dass an einem Ende des Anschlussstutzens ein Bund ausgebildet ist, der in eine Bohrung des Rohrs ragt. Der Spalt zwischen dem Bund und der Bohrung ist so klein, dass Schweißspritzer nicht ins Innere des Rohrs gelangen können. Auch bei diesem Anschlussstutzen erfolgt die Abdichtung ausschließlich durch die Schweißnaht.Another disadvantage of other known welding constructions is that during the welding process spatters or sweats can enter the high-pressure area of the line or the fuel accumulator, which can result in malfunctions of the fuel injection system. This disadvantage is avoided in a known from US 2, 015, 246 A connecting piece, which is suitable for welding to a pipe, characterized in that at one end of the connecting piece, a collar is formed, which projects into a bore of the tube. The gap between the collar and the bore is so small that spatter can not get inside the tube. Even with this connection, the seal is made exclusively by the weld.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Kraftstoffhochdruckspeicher mit einem Gehäuse und einem mit diesem verbundenen Anschlussstutzen bereitzustellen, welche den Hochdruckbereich des Gehäuses und des Anschlussstutzens sicher gegen die Umgebung abdichten und bei welchen der Hochdruckbereich zuverlässig gegen Partikel, die beim Verbinden beider Bauteile entstehen können, geschützt ist.The present invention has for its object to provide a high-pressure fuel accumulator with a housing and a connecting piece connected to this, which securely seal the high-pressure region of the housing and the connecting piece against the environment and in which the high-pressure region reliably against particles that may arise when connecting both components , is protected.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Kraftstoffhochdruckspeicher mit den Merkmalen des Anspruchs 1.This object is achieved by a high-pressure fuel storage with the features of claim 1.

Bei der erfindungsgemäßen Verbindung von Gehäuse und Anschlussstutzen übernimmt das Spannelement mit seiner zylindrischen Dichtfläche in Verbindung mit einem entsprechend gestalteten Gehäuse die Abdichtung des in der Durchgangsbohrung befindlichen Kraftstoffs von der Umgebung. Durch die räumliche Trennung der Funktionen "Halten" und "Dichten" des Anschlussstutzens können sowohl die Dichtfläche als auch die Verbindung von Anschlussstutzen und Gehäuse optimal gestaltet werden.In the inventive connection of the housing and the connecting piece takes the clamping element with its cylindrical sealing surface in conjunction with a correspondingly shaped housing the sealing of the located in the through hole fuel from the environment. Due to the spatial separation of the functions "holding" and "sealing" of the connecting piece, both the sealing surface and the connection of connecting piece and housing can be optimally designed.

Außerdem verhindert die Dichtfläche, dass beim Verbinden von Anschlussstutzen und Gehäuse anfallende Schweissspritzer oder Späne in den Hochdruckbereich von Anschlussstutzen oder Gehäuse gelangen können.In addition, the sealing surface prevents that when connecting connecting piece and housing accumulating weld splashes or shavings can get into the high-pressure area of the connecting piece or housing.

Außerdem entfällt - im Gegensatz zum Stand der Technik, bei dem eine Schweißnaht auch die Abdichtung gegenüber der Umgebung übernimmt - die Kerbwirkung, welche der Betriebsdruck verursacht, wenn der Kraftstoff bis zur Schweißnaht gelangt. Zusätzlich ist es durch die räumliche Trennung der Funktionen "Halten" und "Dichten" nahezu ausgeschlossen, die Dichtfläche beim Verbinden von Anschlussstutzen und Gehäuse zu beschädigen.In addition, in contrast to the prior art, in which a weld also takes over the seal against the environment - eliminates the notch effect, which causes the operating pressure when the fuel reaches the weld. In addition, due to the physical separation of the functions "holding" and "sealing", it is virtually impossible to damage the sealing surface when connecting the connecting piece and housing.

Zusätzlich ist, wegen der Vorspannung des Spannelements, nach erfolgter Schweißung auf Dauer eine Vorspannung zwischen den Dichtflächen des Anschlussstutzens und des Gehäuses vorhanden.In addition, due to the bias of the clamping element, after the welding in the long term, a bias between the sealing surfaces of the connection piece and the housing available.

Schließlich entfällt die durch den unter Betriebsdruck stehenden Kraftstoff möglicherweise hervorgerufene Kerbwirkung auf die Schweissnaht.Finally, the notch effect possibly caused by the fuel under operating pressure on the weld seam is eliminated.

Das gilt vor allem dann, wenn die vom Betriebsdruck des Kraftstoffs beaufschlagte wirksame Querschnittsfläche der Dichtfläche des Spannelements kleiner als die von der Schweißnaht eingeschlossene Fläche ist.This is especially true when the acted upon by the operating pressure of the fuel effective cross-sectional area of the sealing surface of the clamping element is smaller than the area enclosed by the weld seam.

Eine Ausgestaltung der Erfindung sieht vor, dass an einem ersten Ende des Anschlussstutzens konzentrisch zur Durchgangsbohrung ein zylindrisches Spannelement angeordnet ist, wobei das Spannelement eine Durchgangsbohrung aufweist, dass die Bohrung an ihrem dem Anschlusstutzen zugewandten Ende eine Vertiefung aufweist, die mit dem Spannelement eine Presspassung bildet.An embodiment of the invention provides that at a first end of the connecting piece concentric to the through hole, a cylindrical clamping element is arranged, wherein the clamping element has a through hole, that the bore has at its end facing the connection nozzle a recess which forms an interference fit with the clamping element ,

Die Presspassung dichtet die Durchgangsbohrung des Anschlussstutzens und die Bohrung des Gehäuses gegen die Umgebung ab und bildet somit die Dichtfläche. Aufgrund der Flächenpressung zwischen dem Spannelement und der Vertiefung des Gehäuses wird eine gute Dichtwirkung erzielt.The interference fit seals the through-bore of the connecting piece and the bore of the housing against the environment and thus forms the sealing surface. Due to the surface pressure between the clamping element and the recess of the housing a good sealing effect is achieved.

Bei einer anderen Variante ist vorgesehen, dass an einem ersten Ende des Anschlussstutzens konzentrisch zur Durchgangsbohrung eine Senkung angeordnet ist, dass die Bohrung des Gehäuses an ihrem dem Anschlusstutzen zugewandten Ende eine Vertiefung aufweist, und dass zwischen Anschlussstutzen und Gehäuse ein zylindrisches Spannelement vorhanden ist, das mit der Senkung des Anschlussstutzens und der Vertiefung des Gehäuses Presspassungen bildet, so dass Anschlussstutzen, Spannelement und Gehäuse aus verschiedenen, optimal an die jeweiligen Erfordernisse angepassten Materialien hergestellt werden können und somit die Betriebssicherheit verbesssert wird.In another variant, it is provided that at a first end of the connecting piece concentric with the through hole, a countersink is arranged, that the bore of the housing at its end facing the connection nozzle has a recess, and that between the connecting piece and the housing, a cylindrical clamping element is present forms with the reduction of the connection piece and the recess of the housing interference fits, so that connecting piece, clamping element and housing can be made of different, optimally adapted to the respective requirements materials and thus the reliability is improved.

Bei einer Ausführungsform der Erfindung hat das Spannelement die Form eines Außenzylinders, so dass der Betriebsdruck des Kraftstoffs die Dichtfläche des Spannelements nach aussen aufweitet. Dadurch wird die Flächenpressung zwischen der Dichtfläche des Anschlussstutzens und des der Vertiefung des Gehäuses erhöht, was die Dichtheit der Verbindung zusätzlich steigert.In one embodiment of the invention, the clamping element has the shape of an outer cylinder, so that the operating pressure of the fuel expands the sealing surface of the clamping element to the outside. As a result, the surface pressure between the sealing surface of the connecting piece and the recess of the housing is increased, which additionally increases the tightness of the connection.

In weiterer Ausgestaltung der Erfindung ist in dem Spannelement mindestens eine Nut zur Aufnahme eines Dichtrings vorhanden, so dass die Dichtheit durch den Dichtring weiter erhöht wird.In a further embodiment of the invention, at least one groove for receiving a sealing ring is present in the clamping element, so that the tightness is further increased by the sealing ring.

In Ergänzung der Erfindung sind in der Vertiefung des Gehäuses und der Senkung des Anschlussstutzens Nuten zur Aufnahme mindestens je eines Dichtrings vorhanden, so dass das Spannelement besonders klein dimensioniert werden kann, da die Dichtringe einen Teil der Funktion "Dichten" übernimmt und das Spannelement nicht durch Nuten zur Aufnahme eines Dichtrings geschwächt wird.In addition to the invention grooves for receiving at least one respective sealing ring are present in the recess of the housing and the reduction of the connecting piece, so that the clamping element can be particularly small dimensions, since the sealing rings takes over part of the function "densities" and not the clamping element Grooves for receiving a sealing ring is weakened.

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung, der Zeichnung und den Ansprüchen entnehmbar. Ausführungsbeispiele des Gegenstands der Erfindung sind in der Zeichnung dargestellt und im folgenden näher beschrieben. Es zeigen im Längsschnitt:

Fig. 1
eine erste Ausführungsform eines Anschlussstutzens und eines Kraftstoffhochdruckspeichers;
Fig. 2
eine zweite Ausführungsform eines Anschlussstutzens und eines Kraftstoffhochdruckspeichers; sowie
Fig. 3
eine dritte Ausführungsform eines Anschlussstutzens und eines Kraftstoffhochdruckspeichers mit Dichtringen.
Further advantages and advantageous embodiments of the invention are the following description, the drawings and claims removed. Embodiments of the subject invention are illustrated in the drawing and described in more detail below. It shows in longitudinal section:
Fig. 1
a first embodiment of a connecting piece and a high-pressure fuel storage;
Fig. 2
a second embodiment of a connecting piece and a high-pressure fuel storage; such as
Fig. 3
a third embodiment of a connecting piece and a high-pressure fuel accumulator with sealing rings.

In Fig. 1 ist eine erste Ausführungsform eines Anschlussstutzens 1 dargestellt. Der Anschlussstutzen 1 ist mit einem Kraftstoffhochdruckspeicher 2 durch eine umlaufende Schweißnaht 3 verbunden. Der Kraftstoffhochdruckspeicher 2 weist eine Bohrung 4 auf, die mit einer Durchgangsbohrung 5 des Anschlussstutzens 1 und dem Inneren 6 des Kraftstoffhochdruckspeichers 2 verbunden ist.In Fig. 1, a first embodiment of a connecting piece 1 is shown. Of the Connecting piece 1 is connected to a high-pressure fuel storage 2 by a circumferential weld 3. The high-pressure fuel accumulator 2 has a bore 4, which is connected to a through hole 5 of the connecting piece 1 and the interior 6 of the high-pressure fuel accumulator 2.

An dem dem Kraftstoffhochdruckspeicher 2 zugewandten Ende des Anschlussstutzens 1 weist dieser einen Bund 7 auf. Dieser Bund 7 wirkt als Anschlag in Richtung der Längsachse des Anschlussstutzens 1, wenn er auf einer entsprechenden Ringfläche 8 des Kraftstoffhochdruckspeichers 2 aufsitzt. Damit kann die Position des Anschlussstutzens 1 in axialer Richtung bezüglich des Kraftstoffhochdruckspeichers 2 beim Schweißen festgelegt werden.At the fuel high-pressure accumulator 2 facing the end of the connecting piece 1, this has a collar 7. This collar 7 acts as a stop in the direction of the longitudinal axis of the connecting piece 1 when it rests on a corresponding annular surface 8 of the high-pressure fuel accumulator 2. Thus, the position of the connecting piece 1 in the axial direction with respect to the high-pressure fuel accumulator 2 can be determined during welding.

In eine zylindrische Vertiefung 9 des Kraftstoffhochdruckspeichers 2 ragt ein Spannelement 10 des Anschlussstutzens 1 hinein. Das Spannelement 10 bildet mit der Vertiefung 9 des Kraftstoffhochdruckspeichers 2 eine Presspassung und dichtet somit die Verbindung von Kraftstoffhochdruckspeicher 2 und Anschlussstutzen 1 gegen die Umgebung ab. Die Dichtfläche wird somit durch die Presspassung zwischen Anschlussstutzen 1 und Kraftstoffhochdruckspeicher 2 gebildet.In a cylindrical recess 9 of the high-pressure fuel storage 2 a clamping element 10 of the connecting piece 1 projects into it. The clamping element 10 forms with the recess 9 of the high-pressure fuel accumulator 2 an interference fit and thus seals the connection of high-pressure fuel storage 2 and pipe 1 against the environment. The sealing surface is thus formed by the interference fit between the connecting piece 1 and high-pressure fuel storage 2.

Mit zunehmendem Betriebsdruck des hier nicht dargestellten Kraftstoffs in der Bohrung 4 und der Durchgangsbohrung 5 erhöht sich die Anpresskraft zwischen Spannelement 10 und der Vertiefung 9 des Kraftscoffhochdruckspeichers 2 und damit auch die Dichtheit der Verbindung.With increasing operating pressure of the fuel not shown here in the bore 4 and the through hole 5, the contact pressure between the clamping element 10 and the recess 9 of the Kraftscoffhochdruckspeichers 2 and thus also the tightness of the connection increases.

An dem dem Kraftstoffhochdruckspeicher 2 abgewandten Ende des Anschlussstutzens 1 wird üblicherweise eine nicht dargestellte Leitung mittels einer ebenfalls nicht dargestellten Überwurfmutter befestigt.At the end remote from the high-pressure fuel accumulator 2 end of the connecting piece 1, a line, not shown, is usually fastened by means of a union nut, also not shown.

In Fig. 2 ist eine zweite Ausführungsform eines erfindungsgemäßen Anschlussstutzens 1 dargestellt. Die verwendeten Bezugszahlen entsprechen denen in Fig. 1.2, a second embodiment of a connecting piece 1 according to the invention is shown. The reference numbers used correspond to those in FIG. 1.

Der Anschlussstutzen 1 hat eine zylindrische Senkung 13 in die das als separates Bauteil ausgeführte Spannelement 10 hineinragt. Das Spannelenent 10 bildet mit der Vertiefung 9 des Kraftstoffhochdruckspeichers 2 und der Senkung 13 Presspassungen. Dadurch, dass das Spannelement 10 als separates Bauteil ausgeführt ist, kann es hinsichtlich Werkstoff und üerstellungsverfahr.en unabhängig von Anschlussstutzen 1 und Kraftstoffhochdruckspeicher 2 optimiert werden. Die Durchmesser der Senkung 13 und der Vertiefung 9 müssen nicht, wie hier dargestellt, gleich sein. Auch bei dieser Ausführungsform .erhöht der Betriebsdruck des hier nicht dargestellten Kraftstoffs in der Bohrung 4 und der Durchgangsbohrung 5 die Dichtheit der Verbindung von Kraftstoffhochdruckspeicher 2 und Anschlussstutzen 1.The connecting piece 1 has a cylindrical countersink 13 into which the clamping element 10 designed as a separate component projects. The Spannelenent 10 forms with the recess 9 of the high-pressure fuel storage 2 and the reduction 13 interference fits. The fact that the clamping element 10 is designed as a separate component, it can be optimized in terms of material and üerstellungsverfahr.en regardless of connecting piece 1 and high-pressure fuel storage 2. The diameters of the countersink 13 and the recess 9 do not have to be the same, as shown here. Also in this embodiment, the operating pressure of the fuel, not shown here, in the bore 4 and the through-bore 5 increases the tightness of the connection of the high-pressure fuel accumulator 2 and the connecting piece 1.

Auf der rechten Seite von Fig. 3 ist eine Ausführungsform dargestellt gemäß Fig. 1 dargestellt mit dem Unterschied, dass das Spannelement 10 eine Nut 14 aufweist in der sich ein Dichtring 15 befindet.On the right side of Fig. 3, an embodiment shown in FIG. 1 is shown with the difference that the clamping element 10 has a groove 14 in which a sealing ring 15 is located.

Auf der linken Seite von Fig. 3 ist eine Ausführungsform mit separatem Spannelement 10 gemäß Fig. 2 dargestellt, bei der das Spannelement 10 zwei Nuten 14 und zwei Dichtringe 15 aufweist. Einer der Dichtringe 15, welche sich in den Nuten 14 befinden, dichtet das Spannelement 10 gegen die Vertiefung 9 im Kraftstoffhochdruckspeicher 2 und der andere Dichtring 15 dichtet das Spannelement 10 gegen die Senkung 13 des Anschlusssstutzens 1 ab.On the left side of Fig. 3, an embodiment with a separate clamping element 10 according to FIG. 2 is shown, in which the clamping element 10 has two grooves 14 and two sealing rings 15. One of the sealing rings 15, which are located in the grooves 14, seals the clamping element 10 against the recess 9 in the high-pressure fuel storage 2 and the other sealing ring 15 seals the clamping element 10 against the reduction 13 of the connecting piece 1 from.

Durch den Einsatz von Dichtringen kann die Dichtheit der Verbindung von Kraftstoffhochdruckspeicher 2 und Anschlussstutzen 1 weiter erhöht werden. Die Nuten 14 können auch in der Senkung 13 und der Vertiefung 9 angebracht werden.
Alle in der Beschreibung, den nachfolgenden Ansprüchen und der Zeichnung dargestellten Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein.Through the use of sealing rings, the tightness of the connection of high-pressure fuel storage 2 and Connecting piece 1 can be further increased. The grooves 14 can also be mounted in the countersink 13 and the recess 9.
All in the description, the following claims and the drawings illustrated features may be essential to the invention both individually and in any combination.

Claims (6)

  1. High-pressure fuel accumulator for a fuel injection system for internal combustion engines, with a connection piece (1) having a through-bore (5) and connected, liquid-tight, to a housing (2), the housing interior (6) and through-bore (5) being connected hydraulically by means of a bore (4) in the housing (2), and the connection piece (1) being connected to the housing (2) by welding (3), characterized in that a weld seam (3) and means (10, 9, 13) for sealing off the connection of the housing (2) and connection piece (1) are arranged, spatially separated.
  2. High-pressure fuel accumulator according to Claim 1, characterized in that the means for sealing off the connection of the housing (2) and connection piece (1) are designed as a cylindrical tension element (10), in that the cylindrical tension element (10) is arranged concentrically to the through-bore (5) at a first end of the connection piece (1), in that the tension element (10) has a further through-bore, and in that the bore (4) has, at its end facing the connection piece (1), a depression (9) which with the tension element (10) forms a press fit.
  3. High-pressure fuel accumulator according to Claim 1, characterized in that the means for sealing off the connection of the housing (2) and connection piece (1) are designed as a cylindrical tension element (10), in that the cylindrical tension element (10) is arranged between the connection piece (1) and the housing (2), in that a countersink (13) is arranged concentrically to the through-bore (5) at a first end of the connection piece (1), in that the tension element (10) has a further through-bore, in that the bore (4) of the housing (2) has a depression (9) at its end facing the connection piece (1), and in that the tension element (10) forms with the countersink (13) of the connection piece (1) and with the depression (9) of the housing (2) press fits.
  4. High-pressure fuel accumulator according to either one of Claims 2 and 3, characterized in that the tension element (10) is in the form of an outer cylinder.
  5. High-pressure fuel accumulator according to one of Claims 2 to 4, characterized in that at least one groove (14) for receiving a sealing ring (15) is present in the tension element (10).
  6. High-pressure fuel accumulator according to one of Claims 3 to 5, characterized in that grooves (14) for receiving at least one sealing ring (15) are present in the depression (9) of the housing (2) and in the countersink (13) of the connection piece (1).
EP00943620A 1999-07-15 2000-05-19 High pressure fuel accumulator with prestressed welded connecting socket for a fuel injection system of internal combustion engines Expired - Lifetime EP1114252B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19933254 1999-07-15
DE19933254A DE19933254A1 (en) 1999-07-15 1999-07-15 Connection piece and housing, in particular high-pressure fuel accumulator, with prestressed welded connection piece for a fuel injection system for internal combustion engines
PCT/DE2000/001620 WO2001006116A1 (en) 1999-07-15 2000-05-19 Connection and housing for a fuel injection system with a high-pressure fuel accumulator

Publications (2)

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EP1114252A1 EP1114252A1 (en) 2001-07-11
EP1114252B1 true EP1114252B1 (en) 2007-04-18

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EP00943620A Expired - Lifetime EP1114252B1 (en) 1999-07-15 2000-05-19 High pressure fuel accumulator with prestressed welded connecting socket for a fuel injection system of internal combustion engines

Country Status (7)

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US (1) US6513498B1 (en)
EP (1) EP1114252B1 (en)
JP (1) JP2003504561A (en)
KR (1) KR100691206B1 (en)
CN (1) CN1183323C (en)
DE (2) DE19933254A1 (en)
WO (1) WO2001006116A1 (en)

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DE10162203A1 (en) * 2001-12-18 2003-07-10 Bosch Gmbh Robert High pressure fuel store has high pressure connections with holding elements fixed to store at two or more connecting points
JP4007590B2 (en) * 2002-12-11 2007-11-14 臼井国際産業株式会社 High pressure fuel injection pipe with connecting head
DE10333721B4 (en) * 2003-07-23 2005-07-07 Benteler Automobiltechnik Gmbh Fuel rail with a connection piece
DE102004055266A1 (en) * 2004-11-17 2006-05-18 Robert Bosch Gmbh Fuel injection system with multiple accumulators
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Also Published As

Publication number Publication date
KR100691206B1 (en) 2007-03-08
JP2003504561A (en) 2003-02-04
KR20010073160A (en) 2001-07-31
CN1317071A (en) 2001-10-10
CN1183323C (en) 2005-01-05
WO2001006116A1 (en) 2001-01-25
DE50014262D1 (en) 2007-05-31
EP1114252A1 (en) 2001-07-11
US6513498B1 (en) 2003-02-04
DE19933254A1 (en) 2001-01-25

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