WO2003027484A1 - High-pressure fuel accumulator - Google Patents

High-pressure fuel accumulator Download PDF

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Publication number
WO2003027484A1
WO2003027484A1 PCT/DE2002/002613 DE0202613W WO03027484A1 WO 2003027484 A1 WO2003027484 A1 WO 2003027484A1 DE 0202613 W DE0202613 W DE 0202613W WO 03027484 A1 WO03027484 A1 WO 03027484A1
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WO
WIPO (PCT)
Prior art keywords
base body
interior
tubular base
connection
pressure fuel
Prior art date
Application number
PCT/DE2002/002613
Other languages
German (de)
French (fr)
Inventor
Hagen Sassnick
Manfred Hackl
Markus Degn
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2003027484A1 publication Critical patent/WO2003027484A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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 high-pressure fuel accumulator for a fuel injection system of an internal combustion engine, in particular for a common rail system, with a tubular base body, the interior of which is connected to a plurality of connection bores opening into the interior.
  • a high pressure pump conveys the fuel to be injected from a tank to a central high pressure fuel reservoir, which is referred to as a common rail.
  • High-pressure lines lead from the high-pressure fuel reservoir to the individual injection valves, so-called injectors, which are assigned to the cylinders of the internal combustion engine. The injectors are dependent on the. Operating parameters of the internal combustion engine are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine.
  • the base body of the high-pressure fuel accumulator is produced, for example, from a forged blank, the interior of the base body being introduced into the base body as a longitudinal bore.
  • the tubular basic body is then provided with connection holes which open into the longitudinal bore.
  • strong material stresses occur during operation of the common rail system, which can cause cracks in the material, which severely limit the service life of the high-pressure fuel accumulator.
  • materials with a higher material strength must therefore be used, as a result of which the production costs increase sharply.
  • connection bores do not intersect the axis of the tubular base body and open into it eccentrically.
  • this may be an improvement to be achieved and reduces the voltage stress in the Verscheidungen between -Anschlußbohrungen and the interior of the tubular body, "jeL ⁇ ch can with such a high-pressure fuel storage with a further increase of the fuel pressure, the required life not 'be achieved.
  • the tensions in the intersection area between the connection bores and the interior of the tubular base body are advantageously greatly reduced.
  • the connection bores in such a way that they do not open into their entire inner cross-section, but only cut the interior of the tubular base body with part of their inner cross-section, the shape of the transition edge between a connection bore and the interior changes to a three-dimensionally strongly curved structure , whereby the stresses in the area of the transition edge are advantageously distributed over a larger area when the high-pressure fuel accumulator is subjected to pressure.
  • the service life of the high-pressure fuel accumulator can be greatly increased and yet an inexpensive material can be used.
  • connection bores are introduced from a connection of the tubular base body so far into the base body that the connection bores each extend a little beyond the interior into the section of the tubular base body facing away from the connection and there in a blind hole end up.
  • a further development of this embodiment provides that instead of the blind hole, a second connection hole is provided, the central axis of which extends coaxially to the central axis of the first connection hole, the two connection holes complementing one another to form a through recess which extends transversely to the interior through the tubular base body.
  • This structure is even more symmetrical, so that the stresses in the area of the intersection are reduced somewhat more.
  • An embodiment is particularly advantageous in which the transition edge between the at least one connection bore and the interior of the tubular base body is rounded, since in this way a total voltage reduction of about 20% can be achieved compared to the known high-pressure fuel accumulators.
  • FIG. 1 shows a cross section through a high-pressure fuel accumulator according to the invention along a connection bore
  • FIG. 2 shows a section of a cross section through FIG. 1 perpendicular to the central axis of a connection bore and along the line II-II in FIG. 1,
  • FIG 3 shows a cross section through a further exemplary embodiment of the high-pressure fuel accumulator according to the invention.
  • Fig. 1 shows a cross section through a high-pressure fuel accumulator, which comprises an elongate, tubular base body 1 made of metal.
  • the interior 2 of the tubular base body is formed by a longitudinal bore, the inner cross section of which is a circular area.
  • the longitudinal bore is firmly closed or connected to the outlet of a high-pressure pump via a high-pressure line.
  • the interior 2 of the base body 1 can also be configured differently than cylindrical and, for example, have an elliptical cross section.
  • On the lateral surface 5 of the tubular base body 1 a plurality of connecting pieces 4 are formed, for example by forging, of which only one can be seen in FIG. 1.
  • the connecting pieces can also be welded to the tubular base body or fixed in another way to the base body 1.
  • Another connection, not shown, of the high-pressure fuel reservoir is used to connect a high-pressure pump, which supplies the high-pressure fuel reservoir with fuel under high pressure during operation.
  • a rail pressure sensor or a control valve can be connected to the high-pressure fuel accumulator.
  • a connection bore 3 extends into the interior of the tubular base body 1, which is connected to the interior 2.
  • the connecting pieces 4 are provided with an external thread 6 and are used to connect high-pressure lines (not shown) which lead to the injection valves of the common rail system. Via the connection holes 3, the fuel from the high-pressure fuel accumulator is in operation on the injection valves of the common -Rail system distributed.
  • connection bore 3 is introduced into the tubular base body 1 from the section of the outer casing 5 provided with the connection piece 4 such that the connection bore 3 only has one interior space 2 of the tubular base body 1 Part 11 of its inner cross section 10 cuts.
  • FIG. 2 which shows a section through FIG. 1 along the line II-II, the connection bore 3 intersects the cylindrical interior 2, for example, only with half the circular inner cross section, while the other half .12. the cross-sectional area is arranged outside the dimensions of the cylindrical interior 2.
  • the interior space 2 is quasi "cut" by the connection bore.
  • the distance d between the central axis 13 of the connection bore 3 and the central axis 14 of the interior 2 is equal to the radius R of the interior.
  • the distance d can also be larger or smaller than the radius of the interior 2. It is important that the connection bore 3 only cuts the interior 2 with part of its inner cross-section and does not open into the entire inner cross-section.
  • connection bore 3 is introduced from the connection piece 4 into the tubular base body 1 to such an extent that it extends a little way beyond the interior space 2 into the section facing away from the connection piece 4 of the tubular base body 1 and ends there in a blind hole 9.
  • a symmetrical arrangement arises in relation to the cross-sectional plane II-II in FIG. 1, in which the section provided with the blind hole 9 and the remaining section of the connection bore 3 are opposite each other in mirror image.
  • FIG. 3 Another exemplary embodiment, which is a further development of the exemplary embodiment shown in FIG. 1, is shown in FIG. 3.
  • a second connection port 4a which is opposite the first connection port 4 has a second connection bore 3a made in the tubular base body 1, the central axis 13a of which is arranged coaxially with the central axis 13 of the connection bore 3.
  • the two connection bores 3 and 3a complement each other to form a common men passage recess which extends transversely to the interior 2 through the tubular base body 1.
  • Another special embodiment is characterized in that the respective transition edge 15 between a connection hole 3 and the interior 2 of the tubular base body 1 is rounded. This allows a further increase in the high-pressure strength of the high-pressure fuel accumulator to be achieved.

Abstract

The invention relates to a high-pressure fuel accumulator for a fuel injection system of an internal combustion engine, especially a common rail fuel injection system, which comprises a tubular base (1) whose interior space (2) communicates with a plurality of connecting bores (3) leading to said interior space. In order to improve the high-pressure resistance, at least one connecting bore (3) is made in the tubular base (1) in such a manner that it intersects the interior space of the tubular base only with a section (11) of its inner cross-section (10).

Description

KraftstoffhochdruckspeicherHigh-pressure fuel storage
Stand der TechnikState of the art
Die Erfindung betrifft einen -Kraftstoffhochdruckspeicher für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine, insbesondere für ein Common-Rail-System, mit einem rohrformigen Grundkörper, dessen Innenraum mit mehreren in den Innenraum einmündenden Anschlußbohrungen in Verbindung steht .The invention relates to a high-pressure fuel accumulator for a fuel injection system of an internal combustion engine, in particular for a common rail system, with a tubular base body, the interior of which is connected to a plurality of connection bores opening into the interior.
In einem Common-Rail-Einspritzsystem fördert eine Hochdruck- pumpe den einzuspritzenden Kraftstoff aus einem Tank in einen zentralen Kraftstoffhochdruckspeicher, der als Common- Rail bezeichnet wird. Von dem Kraftstoffhochdruckspeicher führen Hochdruckleitungen zu den einzelnen Einspritzventilen, sogenannten Injektoren, die den Zylindern der Brennkraftmaschine zugeordnet sind. Die Injektoren werden in Abhängigkeit von den. Betriebsparametern der Brennkraftmaschine einzeln von der Motorelektronik angesteuert, um Kraftstoff in den Brennraum der Brennkraftmaschine einzuspritzen.In a common rail injection system, a high pressure pump conveys the fuel to be injected from a tank to a central high pressure fuel reservoir, which is referred to as a common rail. High-pressure lines lead from the high-pressure fuel reservoir to the individual injection valves, so-called injectors, which are assigned to the cylinders of the internal combustion engine. The injectors are dependent on the. Operating parameters of the internal combustion engine are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine.
Der Grundkörper des Kraftstoffhochdruckspeichers wird beispielsweise aus einem Schmiederohling hergestellt, wobei der Innenraum des Grundkörpers als Längsbohrung in den Grundkörper eingebracht wird. Der so hergestellte rohrförmige Grund- körper wird anschließend mit Anschlußbohrungen versehen, welche in die Längsbohrung einmünden. Im Bereich der Verscheidung zwischen der Längsbohrung und den Anschlußbohrungen treten im Betrieb des Common-Rail-Systems starke Materialspannungen auf, wodurch Rißbildungen im Material entstehen können, welche die Lebensdauer des Kraftstoffhochdruckspei- chers stark begrenzen. Um einen Kraftstoffhochdruckspeicher bei einem noch höheren Druck betreiben zu können, müssen daher Werkstoffe mit höherer Materialfestigkeit verwandt werden, wodurch die Herstellungskosten stark ansteigen.The base body of the high-pressure fuel accumulator is produced, for example, from a forged blank, the interior of the base body being introduced into the base body as a longitudinal bore. The tubular basic body is then provided with connection holes which open into the longitudinal bore. In the area of the distinction between the longitudinal bore and the connection bores, strong material stresses occur during operation of the common rail system, which can cause cracks in the material, which severely limit the service life of the high-pressure fuel accumulator. In order to be able to operate a high-pressure fuel accumulator at an even higher pressure, materials with a higher material strength must therefore be used, as a result of which the production costs increase sharply.
Aus der DE 196 40 480 AI ist ein 'Kraftstoffhochdruckspeicher bekannt, bei dem die Anschlußbohrungen die Achse des- rohrformigen Grundkörpers nicht schneiden und exentrisch in diesen einmünden. Hierdurch kann zwar eine Verbesserung erreicht werden und die Spannungsbelastung im Bereich der Verscheidungen zwischen den -Anschlußbohrungen und dem Innenraum des rohrformigen Grundkörpers verringert werden, "jeLσch kann mit derartigen Kraftstoffhochdruckspeichern bei einer weiteren Steigerung des Kraftstoffdrucks die erforderliche Lebensdauer nicht' mehr erreicht werden.From DE 196 40 480 AI a ' high-pressure fuel accumulator is known, in which the connection bores do not intersect the axis of the tubular base body and open into it eccentrically. Although this may be an improvement to be achieved and reduces the voltage stress in the Verscheidungen between -Anschlußbohrungen and the interior of the tubular body, "jeLσch can with such a high-pressure fuel storage with a further increase of the fuel pressure, the required life not 'be achieved.
Vorteile der ErfindungAdvantages of the invention
Bei dem erfindungsgemäßen Kraftstoffhochdruckspeicher mit den kennzeichnenden Merkmalen des Anspruchs 1 werden die Spannungen im Verschneidungsbereich zwischen den Anschlußbohrungen und dem Innenraum des rohrformigen Grundkörpers vorteilhaft stark reduziert . Durch die Einbringung der Anschlußbohrungen derart, daß diese nicht mit ihrem gesamten Innenquerschnitt in diesen einmünden, sondern den Innenraum des rohrformigen Grundkörpers nur mit einem Teil ihres Innenquerschnitts schneiden, ändert sich die Form der Übergangskante zwischen einer Anschlußbohrung und dem Innenraum zu einer dreidimensional stark gebogenen Struktur, wodurch sich die Spannungen im Bereich der Übergangskante bei einer Druckbelastung des Kraftstoffhochdruckspeichers vorteilhaft auf einen größeren Bereich verteilen. Die Lebensdauer des Kraftstoffhochdruckspeichers kann so stark erhöht werden und dennoch ein kostengünstiger Werkstoff verwandt werden.In the high-pressure fuel accumulator according to the invention with the characterizing features of claim 1, the tensions in the intersection area between the connection bores and the interior of the tubular base body are advantageously greatly reduced. By introducing the connection bores in such a way that they do not open into their entire inner cross-section, but only cut the interior of the tubular base body with part of their inner cross-section, the shape of the transition edge between a connection bore and the interior changes to a three-dimensionally strongly curved structure , whereby the stresses in the area of the transition edge are advantageously distributed over a larger area when the high-pressure fuel accumulator is subjected to pressure. The service life of the high-pressure fuel accumulator can be greatly increased and yet an inexpensive material can be used.
Vorteilhafte Ausführungsbeispiele und Weiterbildungen der Erfindung werden durch die in den Unteransprüchen enthaltenen Merkmale ermöglicht.Advantageous exemplary embodiments and developments of the invention are made possible by the features contained in the subclaims.
Besonders vorteilhaft ist, wenn die Anschlußbohrungen von einem Anschluß des rohrformigen Grundkörpers aus so weit in den Grundkörper eingebracht ist, daß sich die Anschlußbohrungen jeweils ein Stück weit über den Innenraum hinaus in den von dem Anschluß abgewandten Abschnitt des rohrformigen Grundkörpers erstrecken und dort in einem Sackloch enden. Hierdurch entsteht ein weitgehend symmetrischer Aufbau, bei dem der mit dem Sackloch versehene Abschnitt einer Anschlußbohrung dem jeweiligen restlichen Abschnitt dieser Anschlußbohrung bezogen auf den Innenraum des Hochdruckspeichers spiegelbildlich gegenüberliegt. Spannungen an der Übergangskante zwischen der Anschlußbohrung und dem Innenraum können so noch weiter reduziert werden.It is particularly advantageous if the connection bores are introduced from a connection of the tubular base body so far into the base body that the connection bores each extend a little beyond the interior into the section of the tubular base body facing away from the connection and there in a blind hole end up. This results in a largely symmetrical structure, in which the section of a connection hole provided with the blind hole is mirror-inverted opposite the respective remaining section of this connection hole in relation to the interior of the high-pressure accumulator. Tensions at the transition edge between the connection hole and the interior can be reduced even further.
Eine Weiterbildung dieses Ausführungsbeispiels sieht vor, daß anstelle des Sacklochs eine zweite Anschlußbohrung vorgesehen ist, deren Mittelachse koaxial zur Mittelachse der ersten Anschlußbohrung verläuft, wobei sich die beiden Anschlußbohrungen zu einer Durchgangsausnehmung ergänzen, die sich quer zum Innenraum durchgängig durch den rohrformigen Grundkörper erstreckt. Dieser Aufbau ist noch symmetrischer, so daß die Spannungen im Bereich der Verschneidung noch etwas stärker reduziert werden. Besonders vorteilhaft ist ein Ausführungsbeispiel bei ,dem die Übergangskante zwischen der wenigstens einen Anschlußbohrung und dem Innenraum des rohrformigen Grundkörpers verrundet wird, da hierdurch im Vergleich zu den bekannten Kraftstoffhochdruckspeichern insgesamt eine Spannungsreduktion um etwa 20% erreicht werden kann.A further development of this embodiment provides that instead of the blind hole, a second connection hole is provided, the central axis of which extends coaxially to the central axis of the first connection hole, the two connection holes complementing one another to form a through recess which extends transversely to the interior through the tubular base body. This structure is even more symmetrical, so that the stresses in the area of the intersection are reduced somewhat more. An embodiment is particularly advantageous in which the transition edge between the at least one connection bore and the interior of the tubular base body is rounded, since in this way a total voltage reduction of about 20% can be achieved compared to the known high-pressure fuel accumulators.
Zeichnungendrawings
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung erläutert . Es zeigtExemplary embodiments of the invention are shown in the drawings and are explained in the description below. It shows
Fig. 1 einen Querschnitt durch einen erfindungsgemäßen Kraft- stoffhochdruckspeicher entlang einer Anschlußbohrung, Fig. 2 einen Ausschnitt aus einem Querschnitt durch Fig. 1 senkrecht zur Mittelachse einer Anschlußbohrung und entlang der Linie II-II in Fig. 1,1 shows a cross section through a high-pressure fuel accumulator according to the invention along a connection bore, FIG. 2 shows a section of a cross section through FIG. 1 perpendicular to the central axis of a connection bore and along the line II-II in FIG. 1,
Fig. 3 einen Querschnitt durch ein weiteres Ausführungsbei- spiel des erfindungsgemäßen Kraftstoffhochdruckspeichers .3 shows a cross section through a further exemplary embodiment of the high-pressure fuel accumulator according to the invention.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Fig. 1 zeigt einen Querschnitt durch einen Kraftstoffhochdruckspeicher, der einen langgestreckten, rohrformigen Grundkörper 1 aus Metall umfaßt. Der Innenraum 2 des rohrformigen Grundkörpers wird durch eine Längsbohrung gebildet, deren Innenquerschnitt eine Kreisfläche ist . An den (nicht dargestellten) Stirnseiten des Grundkörpers 1 ist die Längsbohrung fest verschlossen oder über eine Hochdruckleitung mit dem Ausgang einer Hochdruckpumpe verbunden. Der Innenraum 2 des Grundkörpers 1 kann auch anders als zylindrisch ausgebildet sein und beispielsweise einen elliptischen Querschnitt aufweisen. Auf der Mantelfläche 5 des rohrformigen Grundkörpers 1 sind mehrere Anschlußstutzen 4 beispielsweise durch Schmieden angeformt, von denen in Fig. 1 nur einer erkennbar ist. Die Anschlußstutzen können aber auch an den rohrformigen Grundkörper angeschweißt sein oder in anderer Weise an dem Grundkörper 1 festgelegt sein. Ein weiterer nicht dargestellter Anschluß des Kraftstoffhochdruckspeichers dient zum Anschluß einer Hochdruckpumpe, welche den Kraftstoffhochdruckspeicher im Betrieb mit unter Hochdruck stehendem Kraftstoff versorgt. Weiterhin kann noch ein Rail-Drucksensor oder ein Steuerventil an den Kraftstoffhochdruckspeicher angeschlossen sein. Von jedem Anschlußstutzen 4 erstreckt sich jeweils eine Anschlußbohrung 3 ins Innere des rohrformigen Grundkörpers 1, welche mit dem Innenraum 2 in Verbindung steht. Die Anschlußstutzen 4 sind mit einem Außengewinde 6 versehen und dienen zum Anschluß von (nicht dargestellten) Hochdruckleitungen, welche zu den Einspritzventilen des Common-Rail-Systems führen.. Über die Anschlußbohrungen 3 wird im Betrieb der Kraftstoff aus dem Kraftstoffhochdruckspeicher auf die Einspitzventile des Common-Rail-Systems verteilt.Fig. 1 shows a cross section through a high-pressure fuel accumulator, which comprises an elongate, tubular base body 1 made of metal. The interior 2 of the tubular base body is formed by a longitudinal bore, the inner cross section of which is a circular area. At the (not shown) end faces of the base body 1, the longitudinal bore is firmly closed or connected to the outlet of a high-pressure pump via a high-pressure line. The interior 2 of the base body 1 can also be configured differently than cylindrical and, for example, have an elliptical cross section. On the lateral surface 5 of the tubular base body 1, a plurality of connecting pieces 4 are formed, for example by forging, of which only one can be seen in FIG. 1. The connecting pieces can also be welded to the tubular base body or fixed in another way to the base body 1. Another connection, not shown, of the high-pressure fuel reservoir is used to connect a high-pressure pump, which supplies the high-pressure fuel reservoir with fuel under high pressure during operation. Furthermore, a rail pressure sensor or a control valve can be connected to the high-pressure fuel accumulator. From each connection piece 4, a connection bore 3 extends into the interior of the tubular base body 1, which is connected to the interior 2. The connecting pieces 4 are provided with an external thread 6 and are used to connect high-pressure lines (not shown) which lead to the injection valves of the common rail system. Via the connection holes 3, the fuel from the high-pressure fuel accumulator is in operation on the injection valves of the common -Rail system distributed.
Wie in Fig. 1 und Fig. 2 zu erkennen ist, ist die Anschlußbohrung 3 von dem mit dem Anschlußstutzen 4 versehenen Abschnitt des Außenmantels 5 derart in den rohrformigen Grundkörper 1 eingebracht, daß die Anschlußbohrung 3 den Innenraum 2 des rohrformigen Grundkörpers 1 lediglich mit einem Teil 11 ihres Innenquerschnitts 10 schneidet. Wie am besten in Fig. 2 zu erkennen ist, welche einen Schnitt durch Fig. 1 entlang der Linie II-II zeigt, schneidet die Anschlußbohrung 3 den zylindrischen Innenraum 2 beispielsweise nur mit der Hälfte des kreisflächenförmigen Innenquerschnitts, während die andere Hälfte .12. der Querschnittsfläche außerhalb der Abmessungen des zylindrischen Innenraums 2 angeordnet ist . Der Iπnenraum 2 wird von der Anschlußbohrung quasi „angeschnitten". Wenn „r" der Radius der Anschlußbohrung 3 ist, „R" der Radius des zylindrischen Innenraumes 2 und „d" der Abstand der Mittelachse 13 der Anschlußbohrung von der Mittelachse 14 des In- nenraumes ist, wird dies erreicht, falls die folgenden beiden geometrischen Bedingungen gleichzeitig erfüllt sind: 1) r + d > R und 2) d - r < R.As can be seen in FIGS. 1 and 2, the connection bore 3 is introduced into the tubular base body 1 from the section of the outer casing 5 provided with the connection piece 4 such that the connection bore 3 only has one interior space 2 of the tubular base body 1 Part 11 of its inner cross section 10 cuts. As can best be seen in FIG. 2, which shows a section through FIG. 1 along the line II-II, the connection bore 3 intersects the cylindrical interior 2, for example, only with half the circular inner cross section, while the other half .12. the cross-sectional area is arranged outside the dimensions of the cylindrical interior 2. The interior space 2 is quasi "cut" by the connection bore. If "r" is the radius of the connection bore 3, "R" the radius of the cylindrical interior 2 and "d" the distance of the center axis 13 of the connection bore from the center axis 14 of the interior internal space, this is achieved if the following two geometric conditions are met at the same time: 1) r + d> R and 2) d - r <R.
In dem hier gezeigten Ausführungsbeispiel ist der Abstand d der Mittelachse 13 der Anschlußbohrung 3 von der Mittelachse 14 des Innenraumes 2 gleich dem Radius R des Innenraumes. Der Abstand d kann aber auch größer oder kleiner als der Radius des Innenraumes 2 sein. Wichtig ist, daß die Anschlußbohrung 3 den Innenraum 2 lediglich mit einem Teil ihres Innenquer- schnitts schneidet und nicht mit der gesamten Innenquerschnitt in diesen einmündet .In the exemplary embodiment shown here, the distance d between the central axis 13 of the connection bore 3 and the central axis 14 of the interior 2 is equal to the radius R of the interior. The distance d can also be larger or smaller than the radius of the interior 2. It is important that the connection bore 3 only cuts the interior 2 with part of its inner cross-section and does not open into the entire inner cross-section.
Wie weiterhin in Fig. 1 am besten zu erkennen ist, ist die Anschlußbohrung 3 von dem Anschlußstutzen 4 aus soweit in den rohrformigen Grundkörper 1 eingebracht, daß sie sich ein Stück weit über den Innenraum 2 hinaus in den von dem An- schlußstrutzen 4 abgewandten Abschnitt des rohrformigen Grundkörpers 1 erstreckt und dort in einem Sackloch 9 endet-. Vom Innenraum 2 des Grundkörpers 1 aus gesehen, entsteht so bezogen auf die Querschnittsebene II-II in Fig. 1 eine symmetrische Anordnung, bei der sich der mit dem Sackloch 9 versehene Abschnitt und der übrige Abschnitt der Anschluß.- bohrung 3 spiegelbildlich gegenüberliegen.As can also be seen best in FIG. 1, the connection bore 3 is introduced from the connection piece 4 into the tubular base body 1 to such an extent that it extends a little way beyond the interior space 2 into the section facing away from the connection piece 4 of the tubular base body 1 and ends there in a blind hole 9. Seen from the interior 2 of the base body 1, a symmetrical arrangement arises in relation to the cross-sectional plane II-II in FIG. 1, in which the section provided with the blind hole 9 and the remaining section of the connection bore 3 are opposite each other in mirror image.
Ein anders Ausführungsbeispiel, welches eine Weiterentwicklung des in Fig. 1 dargestellten Ausführungsbeispieis ist, ist in Fig. 3 gezeigt. Anstelle des Sacklochs 9 ist bei diesem Ausführungsbeispiel von einem zweiten Anschlußstutzen 4a aus, welcher dem ersten Anschlußstutzen 4 gegenüberliegt, eine zweite Anschlußbohrung 3a in den rohrformigen Grundkörper 1 eingebracht, deren Mittelachse 13a koaxial zur Mittelachse 13 der Anschlußbohrung 3 angeordnet ist. Die beiden Anschlußbohrungen 3 und 3a ergänzen sich zu einer gemeinsa- men Durchgangsausnehmung, die sich quer zum Innenraum 2 durchgängig durch den rohrformigen Grundkörper 1 erstreckt .Another exemplary embodiment, which is a further development of the exemplary embodiment shown in FIG. 1, is shown in FIG. 3. Instead of the blind hole 9, in this embodiment, a second connection port 4a, which is opposite the first connection port 4, has a second connection bore 3a made in the tubular base body 1, the central axis 13a of which is arranged coaxially with the central axis 13 of the connection bore 3. The two connection bores 3 and 3a complement each other to form a common men passage recess which extends transversely to the interior 2 through the tubular base body 1.
Eine weitere besondere Ausführungsart ist dadurch gekennzeichnet, daß die jeweilige Übergangskante 15 zwischen einer Anschlußbohrung 3 und dem Innenraum 2 des rohrformigen Grundkörpers 1 verrundet ist. Hierdurch läßt sich eine weitere Steigerung der Hochdruckfestigkeit des Kraftstoffhochdruckspeichers erreichen. Another special embodiment is characterized in that the respective transition edge 15 between a connection hole 3 and the interior 2 of the tubular base body 1 is rounded. This allows a further increase in the high-pressure strength of the high-pressure fuel accumulator to be achieved.

Claims

Ansprüche Expectations
1. Kraftstoffhochdruckspeicher für ein Kraftstoffeinsprifcz- system einer Brennkraftmaschine, insbesondere für ein Common-Rail-Kraftstoffeinspritzsystem, mit einem rohrformigen Grundkörper (1) , dessen Innenraum (2) mit mehreren in den Innenraum einmündenden Anschlußbohrungen (3) in Verbindung steht, dadurch gekennzeichne , daß wenigstens eine Anschlußbohrung (3) derart in den rohrformigen Grundkörper (1) eingebracht ist, daß sie den Innenraum des rohrformigen Grundkörpers lediglich mit einem Teil (11) ihres Innenquerschnitts (10) schneidet.1. High-pressure fuel reservoir for a fuel injection system of an internal combustion engine, in particular for a common rail fuel injection system, with a tubular base body (1), the interior (2) of which is connected to a plurality of connection bores (3) opening into the interior, characterized in that that at least one connection bore (3) is made in the tubular base body (1) in such a way that it cuts the interior of the tubular base body only with a part (11) of its inner cross section (10).
2. Kraftstoffhochdruckspeicher nach Anspruch 1, dadurch gekennzeichnet, daß der Innenraum (2) des rohrformigen Grundkörpers (1) durch eine im wesentlichen kreiszylinderförmige Ausnehmung gebildet wird.2. High-pressure fuel accumulator according to claim 1, characterized in that the interior (2) of the tubular base body (1) is formed by a substantially circular cylindrical recess.
3. Kraftstoffhochdruckspeicher nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die wenigstens eine Anschlußbohrung (3) von einem Anschluß (4) des rohrformigen Grundkörpers (1) aus so weit in den Grundkörper eingebracht ist, daß sich die Anschlußbohrung (3) ein Stück weit über den Innenraum (2) hinaus in den von dem Anschluß (4) abgewandten Abschnitt des rohrformigen Grundkörpers (1) erstreckt und dort in einem Sackloch (9) endet. 3. High-pressure fuel accumulator according to one of claims 1 or 2, characterized in that the at least one connection bore (3) from a connection (4) of the tubular base body (1) is introduced into the base body so far that the connection bore (3) extends a little way beyond the interior (2) into the section of the tubular base body (1) facing away from the connection (4) and ends there in a blind hole (9).
. Kraftstoffhochdruckspeicher nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß sich zwei Anschlußboh.- rungen (3,3a) mit koaxial zueinander verlaufenden Mittelachsen (13,13a) zu einer Durchgangsausnehmung ergänzen, die sich quer zu dem Innenraum (2) durchgängig durch den rohrformigen Grundkörper (1) erstreckt. (Fig. 3), High-pressure fuel accumulator according to one of claims 1 or 2, characterized in that two connecting bores (3, 3a) with coaxial central axes (13, 13a) complement one another to form a passage recess which runs continuously across the interior (2) extends the tubular base body (1). (Fig. 3)
5. Kraftstoffhochdruckspeicher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Ubergangskante (15) zwischen der wenigstens einen Anschlußbohrung (3) und dem Innenraum (2) des rohrformigen Grundkörpers (1) verrundet ist . 5. High-pressure fuel accumulator according to one of claims 1 to 4, characterized in that the transition edge (15) between the at least one connection bore (3) and the interior (2) of the tubular base body (1) is rounded.
PCT/DE2002/002613 2001-09-22 2002-07-17 High-pressure fuel accumulator WO2003027484A1 (en)

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DE2001146741 DE10146741A1 (en) 2001-09-22 2001-09-22 High-pressure fuel storage
DE10146741.9 2001-09-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005010347A1 (en) * 2003-06-27 2005-02-03 Robert Bosch Gmbh Connection for high-pressure spaces of fuel injectors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640480A1 (en) 1996-09-30 1998-04-02 Bosch Gmbh Robert High pressure fuel accumulator
DE19736191A1 (en) * 1997-08-20 1999-02-25 Siemens Ag Fuel line or fuel store for common-rail fuel injection system
DE19747736C1 (en) * 1997-10-29 1999-04-08 Siemens Ag Pressure reservoir for IC engine common-rail fuel injection supply system
DE19948339C1 (en) * 1999-10-07 2000-12-14 Bosch Gmbh Robert High pressure fuel reservoir for common-rail fuel injection system for i.c. engine provided by hollow tubular body with its interiror space provided by coupled or overlapping cylindrical recesses
DE10002439A1 (en) * 2000-01-21 2001-07-26 Bosch Gmbh Robert Fuel distributor part for fuel supply system in IC engines has flanged connection between fed pipe and plastic distributor body of flanged ring soldered to pipe and flanged collar on plastic body

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640480A1 (en) 1996-09-30 1998-04-02 Bosch Gmbh Robert High pressure fuel accumulator
DE19736191A1 (en) * 1997-08-20 1999-02-25 Siemens Ag Fuel line or fuel store for common-rail fuel injection system
DE19747736C1 (en) * 1997-10-29 1999-04-08 Siemens Ag Pressure reservoir for IC engine common-rail fuel injection supply system
DE19948339C1 (en) * 1999-10-07 2000-12-14 Bosch Gmbh Robert High pressure fuel reservoir for common-rail fuel injection system for i.c. engine provided by hollow tubular body with its interiror space provided by coupled or overlapping cylindrical recesses
DE10002439A1 (en) * 2000-01-21 2001-07-26 Bosch Gmbh Robert Fuel distributor part for fuel supply system in IC engines has flanged connection between fed pipe and plastic distributor body of flanged ring soldered to pipe and flanged collar on plastic body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005010347A1 (en) * 2003-06-27 2005-02-03 Robert Bosch Gmbh Connection for high-pressure spaces of fuel injectors
US7717087B2 (en) 2003-06-27 2010-05-18 Robert Bosch Gmbh Connection for high-pressure chambers of fuel injectors

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