EP1502022B1 - Fuel distribution pipe for motor vehicle injection devices, in particular for common rail systems - Google Patents

Fuel distribution pipe for motor vehicle injection devices, in particular for common rail systems Download PDF

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Publication number
EP1502022B1
EP1502022B1 EP03729864A EP03729864A EP1502022B1 EP 1502022 B1 EP1502022 B1 EP 1502022B1 EP 03729864 A EP03729864 A EP 03729864A EP 03729864 A EP03729864 A EP 03729864A EP 1502022 B1 EP1502022 B1 EP 1502022B1
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EP
European Patent Office
Prior art keywords
sealing body
fuel distribution
pipe
distribution pipe
transmission element
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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.)
Expired - Fee Related
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EP03729864A
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German (de)
French (fr)
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EP1502022A1 (en
Inventor
Eckbert Zander
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Siemens AG
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Siemens AG
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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
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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

Definitions

  • the invention relates to a fuel distribution pipe for motor vehicle injectors, in particular for common rail systems, which consists of a drawn, rolled or forged pipe whose interior forms a high-pressure accumulator for receiving fuel, are connected to the pressure lines, each via a transverse bore lead into the interior of the tube, and which has at least one end face an end closure with a sealing body, wherein the sealing body is pressed sealingly by a force-transmitting element with threaded to a mating contact surface of the tube.
  • Such a fuel distribution pipe is already known from EP 0 866 221 A1.
  • One end face of the known distributor tube-the other end face usually serves to connect to a high-pressure pump-is sealed by a sealing body, in particular spherical or spherical, which is pressed against a contact surface in the fuel distribution tube by a threaded plug arranged axially in series with it.
  • the fuel rail is conventionally made from a forging, be molded onto the connection connections for the attachment of pressure lines.
  • the distribution paths are created by drilling, ie it is introduced a longitudinal bore into which guided through the connection connections cross-holes.
  • the interior space can be made much easier.
  • a forged and drilled fuel distributor also results in a higher strength of the tube despite lower wall thicknesses.
  • the object of the present invention is to further develop the aforementioned fuel distribution pipe in such a way that an optimization of the stress conditions at the intersection edges is made possible.
  • the problematic stresses associated with the structural conditions should be reducible at the intersection edges, even with a given space.
  • the invention is based first of the consideration that the resulting from the internal pressure mechanical stresses can be superimposed on other voltages.
  • these are stresses which result from the sealing force at the connection connection of a pressure line and, on the other hand, stresses which come from the sealing force at the end closure.
  • the voltages emanating from a connection connection are low in magnitude and can be kept low by a sufficiently large distance between the local contact surface and the intersection edge.
  • this voltage component is currently not limiting.
  • the voltage component resulting from the end closure has proved to be significant. It could basically be reduced by reducing the sealing force, which is practically impossible for safety reasons. Increasing the distance between the sealing surface and the nearest intersecting edge thus appears to offer a better alternative. For a given connection position for the pressure line, however, this would inevitably lead to an extension of the fuel distribution pipe.
  • the sealing body and the force transmission element are therefore not arranged axially in series, but at least partially parallel, in order to save axial space.
  • a given space it is thus possible to increase the distance between the contact surface of the sealing body and the intersection edge of the adjacent transverse bore and thereby reduce the stresses caused by the end closure at the critical point of the tube - the nearest intersection edge.
  • it opens, if you accept it the previous voltages, even the ability to reduce the axial length of the fuel distribution pipe.
  • a preferred, easy to manufacture and to be mounted embodiment can be achieved in that the force transmission element is designed as a threaded cap and screwed into a pipe internal thread, and that the cap bottom of the threaded cap abuts the side facing away from the contact surface of the sealing body.
  • FIG 1 shows a section of a known fuel distribution pipe, which substantially corresponds to the embodiment of Figure 10 in the aforementioned EP 0 866 221 A1.
  • the fuel distributor consists of a drawn or rolled tube 1.
  • the interior (the "longitudinal bore") of the tube 1 forms a high-pressure accumulator 2, open into the transverse bores 3, which are each in communication with a pressure line 4.
  • the pressure lines 4 are each connected to a connection 5 to the pipe 1.
  • the diameter of the transverse bore 3 corresponds approximately to the clear diameter of the pressure line 4, so that practically this opens directly into the high-pressure accumulator 2.
  • At the Bohrungsverschneidung between the longitudinal bore and the transverse bore 3 is an intersecting edge 6 is formed.
  • terminal connection 5 Shown in Figure 1 is that terminal connection 5, and thus also the intersection edge 6, which is the contact surface 8 closest. Due to the arrangement of the threaded pin 9 and the sealing body 7 axially in succession, the contact surface 8 is arranged relatively far in the interior of the tube and thus also in relative proximity to the intersection edge 6, which is therefore exposed to a great extent the unfavorable effects of the sealing force, the emanate from the contact surface 8.
  • FIG. 2 shows a fuel distribution pipe not according to the invention, in which the end closure of the pipe 1 is ensured by a sealing body 7 which is fixed by a threaded cap 10.
  • the threaded cap 10 has at its wings, more precisely: on the inside of its cylindrical part, an internal thread, while the tube 1 has a corresponding external thread 11.
  • the sealing body 7 is directly, optionally with tolerance compensation, on the cap base 12 of the threaded cap 10 at.
  • the wings of the threaded cap 10 extend as can be seen, over a substantial part of the axial extent of the sealing body 7.
  • the material and the thickness of the cap base 12 can be selected depending on the specific circumstances.
  • the cap base 12 may be integrally connected to the side of the sealing body 7 facing away from the contact surface 8.
  • the sealing body 7 can not only be designed as a sealing ball which can be produced with little effort, as shown in the figures, but also, for example, with a first end face which is convex or spherical towards the interior and with a second end face flat with the force transmission element 10.
  • additional axial space can optionally be saved.
  • advantageously can be produced with little effort, cold-impacted power transmission element use.
  • the power transmission element is, as shown in Figure 3A, designed as a threaded plug 13 with a dense body side recess 14 and be screwed into a pipe internal thread 15.
  • the sealing body 7 is taken to save space with a portion of its axial length in the recess 14, the dense height is thus enclosed in this case by the threaded plug 13 downright.
  • the embodiment according to FIG. 3B, in which the threaded cap 18 is screwed into a tube internal thread differs above all from a geometric point of view (larger radius) from the embodiment according to FIG. 3A.
  • 3A and 3B are necessary for the introduction of force when screwing in the power transmission element 10, 13, and 18 openings or areas.
  • outer key surfaces or it may be a rear insertion similar to that in Figure 1, may be provided.

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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)

Description

Die Erfindung betrifft ein Kraftstoffverteilungsrohr für Kraftfahrzeug-Einspritzeinrichtungen, insbesondere für Common-Rail-Systeme, das aus einem gezogenen, gewalzten oder geschmiedeten Rohr besteht, dessen Innenraum einen Hochdruckspeicher zur Aufnahme von Kraftstoff bildet, an das Druckleitungen angeschlossen sind, die jeweils über eine Querbohrung im Rohr in den Innenraum münden, und das mindestens an einer Stirnseite einen Endverschluss mit einem Dichtkörper aufweist, wobei der Dichtkörper durch ein Kraftübertragungselement mit Gewinde an eine angepasste Anlagefläche des Rohres dichtend angepresst ist.The invention relates to a fuel distribution pipe for motor vehicle injectors, in particular for common rail systems, which consists of a drawn, rolled or forged pipe whose interior forms a high-pressure accumulator for receiving fuel, are connected to the pressure lines, each via a transverse bore lead into the interior of the tube, and which has at least one end face an end closure with a sealing body, wherein the sealing body is pressed sealingly by a force-transmitting element with threaded to a mating contact surface of the tube.

Ein derartiges Kraftstoffverteilungsrohr ist bereits aus der EP 0 866 221 A1 bekannt. Eine Stirnseite des bekannten Verteilerrohres - die andere Stirnseite dient üblicherweise dem Anschluss an eine Hochdruckpumpe - ist durch einen zum Innenraum hin insbesondere ballig oder kugelförmig ausgeformten Dichtkörper verschlossen, der durch einen axial in Reihe dazu angeordneten Gewindestopfen an eine Anlagefläche im Kraftstoffverteilungsrohr dichtend angepresst wird.Such a fuel distribution pipe is already known from EP 0 866 221 A1. One end face of the known distributor tube-the other end face usually serves to connect to a high-pressure pump-is sealed by a sealing body, in particular spherical or spherical, which is pressed against a contact surface in the fuel distribution tube by a threaded plug arranged axially in series with it.

Dokument US 627336 zeigt ebenfalls ein derartiges Kraftstoffverteilungsrohr mit einem Anschluss an der Sternseite.Document US 627336 also shows such a fuel distribution tube with a connection on the star side.

In der Kraftfahrzeugtechnik werden insbesondere für Dieselmotoren zunehmend Einspritzsysteme eingesetzt, in deren Leitungssystem ein statisch komprimierter Kraftstoff bei Betriebsdrücken von weit über 1.000 bar bereitgestellt werden soll. Auf Grund der hohen Drücke sind die Anforderungen hinsichtlich Materialfestigkeit und Dichtigkeit an das Leitungssystem, insbesondere an den als Hochdruckspeicher fungierenden Kraftstoffverteiler (Rail) sehr hoch.In motor vehicle technology injection systems are increasingly being used, in particular for diesel engines, in whose line system a statically compressed fuel is to be provided at operating pressures of well over 1,000 bar. Due to the high pressures, the requirements in terms of material strength and tightness of the line system, especially at the acting as a high-pressure accumulator fuel rail (rail) are very high.

Um diese Anforderungen zu erfüllen, wird das Kraftstoffverteilungsrohr konventionell aus einem Schmiedestück hergestellt, an das Anschlussverbindungen zur Befestigung von Druckleitungen angeformt werden. Die Verteilerwege werden durch Bohrungen geschaffen, d. h. es ist eine Längsbohrung eingebracht, in die durch die Anschlussverbindungen geführte Querbohrungen münden. Bei einem gezogenen oder gewalzten Kraftstoffverteilungsrohr kann der Innenraum (die Längsbohrung) wesentlich einfacher gefertigt werden. Gegenüber einem geschmiedeten und aufgebohrten Kraftstoffverteiler ergibt sich außerdem eine höhere Festigkeit des Rohres trotz geringerer Wandstärken.To meet these requirements, the fuel rail is conventionally made from a forging, be molded onto the connection connections for the attachment of pressure lines. The distribution paths are created by drilling, ie it is introduced a longitudinal bore into which guided through the connection connections cross-holes. In a drawn or rolled fuel distribution pipe, the interior space (the longitudinal bore) can be made much easier. Compared to a forged and drilled fuel distributor also results in a higher strength of the tube despite lower wall thicknesses.

Im Kraftstoffverteilungsrohr treten die höchsten mechanischen Spannungen an der Bohrungsverschneidung zwischen Längsbohrung und Querbohrung auf. Diese hohen Spannungen an den jeweiligen Verschneidungskanten werden üblicherweise durch die vektorielle Überlagerung der bei Innendruckbelastung entstehenden Umfangsspannungen erklärt. In diesem Zusammenhang ist es aus der obengenannten EP 0 866 221 A1 bekannt, die Festigkeit des Rohres durch eine Innenbearbeitung der Oberfläche zu erhöhen. Dadurch wird die aus der mechanischen Bearbeitung (Einbringen der Einsteck- bzw. Querbohrungen) sich ergebende Kerbwirkung reduziert und eine Kantenabrundung im Übergangsbereich der Einsteck- bzw. Querbohrungen mit der Innenwand erreicht, was gleichfalls eine Minderung der - bei Innendruckbelastung an der Bohrungsverschneidung auftretenden - Kerbwirkung zur Folge hat.In the fuel distribution pipe, the highest mechanical stresses occur at the bore intersection between the longitudinal bore and the transverse bore. These high stresses at the respective intersection edges are usually explained by the vectorial superimposition of the circumferential stresses arising during internal pressure loading. In this connection, it is known from the abovementioned EP 0 866 221 A1 to increase the strength of the tube by internal machining of the surface. As a result, the notch effect resulting from the mechanical processing (introduction of the insertion or transverse bores) is reduced and an edge rounding is achieved in the transition region of the insertion or transverse bores with the inner wall, which likewise reduces the notch effect occurring in the case of internal pressure loading at the bore intersection entails.

Aufgabe der vorliegenden Erfindung ist es, das eingangs genannte Kraftstoffverteilungsrohr so weiterzuentwickeln, dass eine Optimierung der Spannungsverhältnisse an den Verschneidungskanten ermöglicht ist. Insbesondere sollen die mit den konstruktiven Verhältnissen insgesamt einhergehenden problematischen Spannungen an den Verschneidungskanten auch bei gegebenem Bauraum verringerbar sein.The object of the present invention is to further develop the aforementioned fuel distribution pipe in such a way that an optimization of the stress conditions at the intersection edges is made possible. In particular, the problematic stresses associated with the structural conditions should be reducible at the intersection edges, even with a given space.

Diese Aufgabe wird bei einem Kraftstoffverteilungsrohr des Anspruchs 1 dadurch gelöst, dass der Dichtkörper und das Kraftübertragungselement in axialer Richtung mindestens teilweise parallel zueinander angeordnet sind. Vorteilhafte Ausgestaltungen sind den Unteransprüchen entnehmbar.This object is achieved in a fuel distribution pipe of claim 1, characterized in that the sealing body and the force transmission element are arranged in the axial direction at least partially parallel to each other. Advantageous embodiments are the dependent claims.

Der Erfindung liegt zunächst die Überlegung zugrunde, dass den aus dem Innendruck resultierenden mechanischen Spannungen noch weitere Spannungen überlagert sein können. Zum einen sind dies Spannungen, die aus der Dichtkraft an der Anschlussverbindung einer Druckleitung resultieren, zum anderen Spannungen, die aus der Dichtkraft am Endverschluss kommen. Die weitere Überlegung ergibt, dass die von einer Anschlussverbindung ausgehenden Spannungen betragsmäßig gering sind und durch einen genügend großen Abstand zwischen der dortigen Anpressfläche und der Verschneidungskante gering gehalten werden können. Bei den üblichen Wandstärken der Kraftstoffverteilungsrohre wirkt dieser Spannungsanteil derzeit nicht limitierend. Als signifikant hat sich jedoch der vom Endverschluss herrührende Spannungsanteil herausgestellt. Er könnte grundsätzlich durch eine Verringerung der Dichtkraft verringert werden, was aus Sicherheitsgründen praktisch aber nicht möglich ist. Eine Vergrößerung des Abstandes zwischen Dichtfläche und nächstgelegener Verschneidungskante scheint sich somit als bessere Alternative anzubieten. Bei vorgegebener Anschlussposition für die Druckleitung würde dies jedoch zwangsläufig zu einer Verlängerung des Kraftstoffverteilungsrohres führen.The invention is based first of the consideration that the resulting from the internal pressure mechanical stresses can be superimposed on other voltages. On the one hand, these are stresses which result from the sealing force at the connection connection of a pressure line and, on the other hand, stresses which come from the sealing force at the end closure. The further consideration shows that the voltages emanating from a connection connection are low in magnitude and can be kept low by a sufficiently large distance between the local contact surface and the intersection edge. In the usual wall thicknesses of fuel distribution pipes this voltage component is currently not limiting. However, the voltage component resulting from the end closure has proved to be significant. It could basically be reduced by reducing the sealing force, which is practically impossible for safety reasons. Increasing the distance between the sealing surface and the nearest intersecting edge thus appears to offer a better alternative. For a given connection position for the pressure line, however, this would inevitably lead to an extension of the fuel distribution pipe.

Erfindungsgemäß werden Dichtkörper und Kraftübertragungselement deshalb nicht axial in Reihe, sondern mindestens teilweise parallel angeordnet, um axialen Bauraum einzusparen. Bei gegebenem Bauraum gelingt es somit, den Abstand zwischen der Anlagefläche des Dichtkörpers und der Verschneidungskante der benachbarten Querbohrung zu vergrößern und dadurch die vom Endverschluss an der kritischen Stelle des Rohres - der nächstgelegenen Verschneidungskante - verursachten Spannungen zu verringern. Andererseits eröffnet sich, bei Inkaufnahme der bisherigen Spannungen, sogar die Möglichkeit, die axiale Baulänge des Kraftstoffverteilungsrohres zu verringern.According to the invention, the sealing body and the force transmission element are therefore not arranged axially in series, but at least partially parallel, in order to save axial space. With a given space, it is thus possible to increase the distance between the contact surface of the sealing body and the intersection edge of the adjacent transverse bore and thereby reduce the stresses caused by the end closure at the critical point of the tube - the nearest intersection edge. On the other hand, it opens, if you accept it the previous voltages, even the ability to reduce the axial length of the fuel distribution pipe.

Eine bevorzugte, einfach herzustellende und zu montierende Ausführungsform lässt sich dadurch erreichen, dass das Kraftübertragungselement als Gewindekappe ausgebildet und in ein Rohr-Innengewinde eingeschraubt ist, und dass der Kappenboden der Gewindekappe an der von der Anlagefläche abgewandten Seite des Dichtkörpers anliegt.A preferred, easy to manufacture and to be mounted embodiment can be achieved in that the force transmission element is designed as a threaded cap and screwed into a pipe internal thread, and that the cap bottom of the threaded cap abuts the side facing away from the contact surface of the sealing body.

In den folgenden Ausführungsbeispielen wird das Kraftstoffverteilungsrohr anhand der Figuren der Zeichnung näher erläutert. Es zeigen

  • Figur 1 ein Kraftstoffverteilungsrohr gemäß dem Stand der Technik in geschnittener Seitenansicht,
  • Figur 2, in gleicher Darstellung, ein nicht erfindungsgemäßes Kraftstoffverteilungsrohr,
  • Figur 3A und 3B, in gleicher Darstellung, weitere Ausführungsbeispiele der Erfindung.
In the following embodiments, the fuel distribution pipe is explained in more detail with reference to the figures of the drawing. Show it
  • 1 shows a fuel distribution pipe according to the prior art in a sectional side view,
  • 2, in the same representation, a not according to the invention fuel distribution pipe,
  • Figures 3A and 3B, in the same representation, further embodiments of the invention.

Figur 1 zeigt einen Ausschnitt eines bekannten Kraftstoffverteilungsrohres, das im wesentlichen der Ausführung gemäß Figur 10 in der obengenannten EP 0 866 221 A1 entspricht. Der Kraftstoffverteiler besteht aus einem gezogenen oder gewalzten Rohr 1. Der Innenraum (die "Längsbohrung") des Rohres 1 bildet einen Hochdruckspeicher 2, in den Querbohrungen 3 münden, die jeweils mit einer Druckleitung 4 in Verbindung stehen. Die Druckleitungen 4 sind jeweils mit einer Anschlussverbindung 5 an das Rohr 1 angeschlossen. Der Durchmesser der Querbohrung 3 entspricht in etwa dem lichten Durchmesser der Druckleitung 4, so dass praktisch diese unmittelbar in den Hochdruckspeicher 2 mündet. Zu jeder Druckleitung 4 gehört also eine im Rohr 1 radial verlaufende Querbohrung 3. An der Bohrungsverschneidung zwischen der Längsbohrung und der Querbohrung 3 ist eine Verschneidungskante 6 gebildet.Figure 1 shows a section of a known fuel distribution pipe, which substantially corresponds to the embodiment of Figure 10 in the aforementioned EP 0 866 221 A1. The fuel distributor consists of a drawn or rolled tube 1. The interior (the "longitudinal bore") of the tube 1 forms a high-pressure accumulator 2, open into the transverse bores 3, which are each in communication with a pressure line 4. The pressure lines 4 are each connected to a connection 5 to the pipe 1. The diameter of the transverse bore 3 corresponds approximately to the clear diameter of the pressure line 4, so that practically this opens directly into the high-pressure accumulator 2. For each pressure line 4 so one in the pipe 1 radially extending transverse bore 3. At the Bohrungsverschneidung between the longitudinal bore and the transverse bore 3 is an intersecting edge 6 is formed.

An der in Figur 1 erkennbaren rechten Stirnseite des Rohres 1 ist dieses mit einem Endverschluss versehen. Dieser besteht im wesentlichen aus einem kugelförmigen Dichtkörper 7, der an einer entsprechend angepassten Anlagefläche 8 im Inneren des Rohres 1 dichtend anliegt. Es ist erforderlich, den Dichtkörper 7 an der Anlagefläche 8 durch einen Gewindestift 9 so festzusetzen, dass ein dichter Verschluss 16 des Hochdruckspeichers 2 auch unter Berücksichtigung der darin herrschenden hohen Drücke gewährleistet ist. Der dichte Verschluss 16 kann, wie in Figur 1 angedeutet, durch eine leichte Anpassung von Dichtkörper 7 und Gewindestift 9 im Sinne eines Toleranzausgleichs unterstützt werden. Der Gewindestift 9 kann mit Hilfe einer für ein Schraubwerkzeug vorgesehenen Einstecköffnung 17 eingeschraubt werden.At the recognizable in Figure 1 right front side of the tube 1, this is provided with an end closure. This consists essentially of a spherical sealing body 7, which bears sealingly against a correspondingly adapted bearing surface 8 in the interior of the tube 1. It is necessary to fix the sealing body 7 on the contact surface 8 by a threaded pin 9 so that a tight seal 16 of the high pressure accumulator 2 is ensured even taking into account the high pressures prevailing therein. The tight closure 16 can, as indicated in Figure 1, be supported by a slight adjustment of sealing body 7 and threaded pin 9 in the sense of tolerance compensation. The threaded pin 9 can be screwed by means of an opening provided for a screw 17 insertion.

Dargestellt in Figur 1 ist diejenige Anschlussverbindung 5, und damit auch die Verschneidungskante 6, welche der Anlagefläche 8 am nächsten liegt. Auf Grund der Anordnung des Gewindestifts 9 und des Dichtkörpers 7 axial hintereinander ist die Anlagefläche 8 relativ weit im Inneren des Rohres angeordnet und damit auch in relativer Nähe zur Verschneidungskante 6, die deshalb in hohem Maße den für sie ungünstigen Wirkungen der Dichtkraft ausgesetzt ist, die von der Anlagefläche 8 ausgehen.Shown in Figure 1 is that terminal connection 5, and thus also the intersection edge 6, which is the contact surface 8 closest. Due to the arrangement of the threaded pin 9 and the sealing body 7 axially in succession, the contact surface 8 is arranged relatively far in the interior of the tube and thus also in relative proximity to the intersection edge 6, which is therefore exposed to a great extent the unfavorable effects of the sealing force, the emanate from the contact surface 8.

Figur 2 zeigt ein nicht erfindungsgemäßes Kraftstoffverteilungsrohr, bei dem der Endverschluss des Rohres 1 durch einen Dichtkörper 7 gewährleistet wird, der durch eine Gewindekappe 10 festgelegt ist. Die Gewindekappe 10 weist an ihren Flügeln, genauer: an der Innenseite ihres zylindrischen Teils, ein Innengewinde auf, während das Rohr 1 ein entsprechendes Außengewinde 11 aufweist. Der Dichtkörper 7 liegt unmittelbar, gegebenenfalls mit Toleranzausgleich, am Kappenboden 12 der Gewindekappe 10 an. Die Flügel der Gewindekappe 10 erstrecken sich außerhalb des Rohres 1, wie erkennbar, über einen wesentlichen Teil der axialen Ausdehnung des Dichtkörpers 7. Das Material und die Stärke des Kappenbodens 12 können in Abhängigkeit von den konkreten Gegebenheiten gewählt werden.FIG. 2 shows a fuel distribution pipe not according to the invention, in which the end closure of the pipe 1 is ensured by a sealing body 7 which is fixed by a threaded cap 10. The threaded cap 10 has at its wings, more precisely: on the inside of its cylindrical part, an internal thread, while the tube 1 has a corresponding external thread 11. The sealing body 7 is directly, optionally with tolerance compensation, on the cap base 12 of the threaded cap 10 at. The wings of the threaded cap 10 extend as can be seen, over a substantial part of the axial extent of the sealing body 7. The material and the thickness of the cap base 12 can be selected depending on the specific circumstances.

Durch die teilparallele Anordnung von Dichtkörper 7 und Kraftübertragungselement 10 in Figur 2 kann axialer Bauraum gespart werden. Der Längenunterschied zwischen der Stärke des Kappenbodens 12 und der Länge des bisherigen Gewindestiftes 9 gemäß Figur 1 entspricht der Einsparung an axialer Baulänge bzw. dem Potenzial der Abstandsvergrößerung zwischen der Anlagefläche 8 und der Verschneidungskante 6. Einerseits ist demnach eine Spannungsverringerung an der Verschneidungskante 6 bei gleicher axialer Baulänge des Kraftstoffverteilungsrohres möglich; andererseits ist eine absolute Verringerung der axialen Baulänge bei gleichen Spannungen realisierbar. Diese beiden Merkmale sind, in mehr oder weniger starker relativer Ausprägung, auch kombinierbar.Due to the partially parallel arrangement of sealing body 7 and power transmission element 10 in Figure 2 axial space can be saved. The difference in length between the thickness of the cap base 12 and the length of the previous grub screw 9 according to Figure 1 corresponds to the savings in axial length or the potential of increasing the distance between the contact surface 8 and the intersection edge 6. On the one hand, therefore, a voltage reduction at the intersection edge 6 at the same axial length of the fuel distribution pipe possible; On the other hand, an absolute reduction of the axial length at the same voltages can be realized. These two features can also be combined, to a greater or lesser degree.

In einer Abwandlung kann der Kappenboden 12 einstückig mit der von der Anlagefläche 8 abgewandten Seite des Dichtkörpers 7 verbunden sein. Generell kann der Dichtkörper 7 nicht nur, wie in den Figuren dargestellt, als mit geringem Aufwand herstellbare Dichtkugel ausgeführt sein, sondern beispielsweise auch mit einer zum Innenraum hin ballig oder kugelförmig ausgeformten ersten Stirnseite und mit einer zum Kraftübertragungselement 10 hin flach ausgeführten zweiten Stirnseite. Dadurch kann gegebenenfalls weiterer axialer Bauraum eingespart werden. Ebenfalls generell kann vorteilhafterweise ein mit geringem Aufwand herstellbares, kaltgeschlagenes Kraftübertragungselement Verwendung finden.In a modification, the cap base 12 may be integrally connected to the side of the sealing body 7 facing away from the contact surface 8. In general, the sealing body 7 can not only be designed as a sealing ball which can be produced with little effort, as shown in the figures, but also, for example, with a first end face which is convex or spherical towards the interior and with a second end face flat with the force transmission element 10. As a result, additional axial space can optionally be saved. Also generally, advantageously, can be produced with little effort, cold-impacted power transmission element use.

Das Kraftübertragungselement ist, wie in Figur 3A gezeigt, als Gewindestopfen 13 mit einer dichtkörperseitigen Ausnehmung 14 ausgebildet und in ein Rohr-Innengewinde 15 eingeschraubt sein. Dabei ist der Dichtkörper 7 bauraumsparend mit einem Teil seiner axialen Länge in die Ausnehmung 14 aufgenommen, die dichte Höhe wird also in diesem Falle vom Gewindestopfen 13 regelrecht umschlossen. Die Ausführung gemäß Figur 3B, bei der die Gewindekappe 18 in ein Rohr-Innengewinde eingeschraubt ist, unterscheidet sich vor allem in geometrischer Hinsicht (größerer Radius) von der Ausführung gemäß Figur 3A.The power transmission element is, as shown in Figure 3A, designed as a threaded plug 13 with a dense body side recess 14 and be screwed into a pipe internal thread 15. In this case, the sealing body 7 is taken to save space with a portion of its axial length in the recess 14, the dense height is thus enclosed in this case by the threaded plug 13 downright. The embodiment according to FIG. 3B, in which the threaded cap 18 is screwed into a tube internal thread, differs above all from a geometric point of view (larger radius) from the embodiment according to FIG. 3A.

Nicht dargestellt in den Figuren 2, 3A und 3B sind die zur Krafteinleitung beim Einschrauben des Kraftübertragungselementes 10, 13, und 18 notwendigen Öffnungen bzw. Flächen. Beispielsweise können, an den Flügeln der Gewindekappe 10, 18, äußere Schlüsselflächen oder es kann eine rückseitige Einstecköffnung, ähnlich wie in Figur 1, vorgesehen sein.Not shown in Figures 2, 3A and 3B are necessary for the introduction of force when screwing in the power transmission element 10, 13, and 18 openings or areas. For example, on the wings of the threaded cap 10, 18, outer key surfaces or it may be a rear insertion, similar to that in Figure 1, may be provided.

Claims (3)

  1. Fuel distribution pipe for vehicle injection devices, in particular for common rail systems
    - consisting of a drawn, rolled or forged pipe (1), the interior of which forms a high pressure accumulator (2) for accommodating fuel,
    - to which are connected pressure lines (4) each of which opens into the interior of the pipe (1) through a transverse bore (3),
    - which has, on at least one face, an end closure with a sealing body (7), whereby a threaded force transmission element (9, 10, 13) presses the sealing body (7) against an appropriately designed mating surface (8) on the pipe (1) to form a seal, and
    the sealing body (7) and the force transmission element (10, 13, 18) are arranged to be at least partially parallel to each other in an axial direction
    characterised in that
    the force transmission element takes the form of a threaded stopper (13) with a recess (14) on the sealing body side, and is screwed into an internal thread (15) in the pipe, and that the sealing body (7) is accommodated for part of its axial length in the recess (14), and the sealed height of the sealing body (7) is surrounded by the threaded stopper (13).
  2. Fuel distribution pipe in accordance with claim 1, characterised in that the sealing body (7) takes the form of a sphere or has a face which, on the interior side, is domed or spherical in shape.
  3. Fuel distribution pipe in accordance with claim 1 or 2, characterised in that the force transmission element (10, 13) consists of cold-forged steel.
EP03729864A 2002-05-07 2003-05-05 Fuel distribution pipe for motor vehicle injection devices, in particular for common rail systems Expired - Fee Related EP1502022B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10220339A DE10220339A1 (en) 2002-05-07 2002-05-07 Fuel distribution pipe for motor vehicle injection devices, in particular for common rail systems
DE10220339 2002-05-07
PCT/DE2003/001431 WO2003095826A1 (en) 2002-05-07 2003-05-05 Fuel distribution pipe for motor vehicle injection devices, in particular for common rail systems

Publications (2)

Publication Number Publication Date
EP1502022A1 EP1502022A1 (en) 2005-02-02
EP1502022B1 true EP1502022B1 (en) 2006-07-19

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EP03729864A Expired - Fee Related EP1502022B1 (en) 2002-05-07 2003-05-05 Fuel distribution pipe for motor vehicle injection devices, in particular for common rail systems

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US (1) US7004145B2 (en)
EP (1) EP1502022B1 (en)
JP (1) JP4008920B2 (en)
DE (2) DE10220339A1 (en)
WO (1) WO2003095826A1 (en)

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DE602005002368T2 (en) * 2005-07-08 2008-05-29 C.R.F. Società Consortile per Azioni, Orbassano Arrangement for connecting a fuel reservoir for fuel under pressure and at least one injector, for an internal combustion engine
DE102008017151B3 (en) * 2008-04-03 2009-08-27 Continental Automotive Gmbh Fuel injection system for an internal combustion engine
AT509177B1 (en) * 2009-11-23 2013-09-15 Bosch Gmbh Robert PRESSURE TUBE FITTINGS FOR COMMON RAIL INJECTION SYSTEM
JP2012112355A (en) * 2010-11-26 2012-06-14 Otics Corp Delivery pipe
US20130001891A1 (en) * 2011-06-29 2013-01-03 Caterpillar Inc. Sealing assembly
JP2014009680A (en) * 2012-07-03 2014-01-20 Aisan Ind Co Ltd Fuel delivery pipe
JP2015025436A (en) * 2013-07-29 2015-02-05 株式会社デンソー Accumulator vessel
DE102015205980A1 (en) * 2015-04-02 2016-10-06 Robert Bosch Gmbh Fuel injection system and hydraulic connection to a fuel injection system
US9574534B2 (en) * 2015-05-19 2017-02-21 Millennium Industries Corporation Reinforced end cap assembly for pressure vessel
WO2017094401A1 (en) * 2015-11-30 2017-06-08 日立オートモティブシステムズ株式会社 Injector, fuel rail, and fuel rail assembly
KR102466840B1 (en) * 2016-04-08 2022-11-15 에이치엘만도 주식회사 Valve Block
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CN111520266A (en) * 2020-03-17 2020-08-11 成都威特电喷有限责任公司 Lightweight high-pressure oil rail

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Also Published As

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US7004145B2 (en) 2006-02-28
DE10220339A1 (en) 2003-11-27
EP1502022A1 (en) 2005-02-02
WO2003095826A1 (en) 2003-11-20
US20050045152A1 (en) 2005-03-03
JP4008920B2 (en) 2007-11-14
JP2005530080A (en) 2005-10-06
DE50304287D1 (en) 2006-08-31

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