WO2004070193A1 - High-pressure fuel accumulator - Google Patents

High-pressure fuel accumulator Download PDF

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Publication number
WO2004070193A1
WO2004070193A1 PCT/DE2003/003099 DE0303099W WO2004070193A1 WO 2004070193 A1 WO2004070193 A1 WO 2004070193A1 DE 0303099 W DE0303099 W DE 0303099W WO 2004070193 A1 WO2004070193 A1 WO 2004070193A1
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WO
WIPO (PCT)
Prior art keywords
pressure fuel
interior
chamfer
fuel accumulator
base body
Prior art date
Application number
PCT/DE2003/003099
Other languages
German (de)
French (fr)
Inventor
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 WO2004070193A1 publication Critical patent/WO2004070193A1/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

  • An injection system is used to supply an internal combustion engine with fuel.
  • the accumulator injection system called common rail system, pressure generation and injection are decoupled from one another in time and place.
  • a separate high-pressure pump generates the injection pressure in a central high-pressure fuel reservoir.
  • the start of injection and the injection quantity are determined by the activation time and duration of electrically actuated injectors which are connected to the high-pressure fuel reservoir via fuel lines.
  • electrically actuated injectors which are connected to the high-pressure fuel reservoir via fuel lines.
  • DE-A 199 36 533 relates to a high-pressure fuel accumulator for a Comrnon-Rail fuel injection system of an internal combustion engine with a tubular base body which has a blind hole running in the longitudinal direction and a plurality of connections.
  • the high-pressure fuel accumulator has a hollow base body that is equipped with several connection openings.
  • the interior of the base body is flat in the area of the connection openings.
  • DE-A 199 45 316 also relates to a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine with a tubular base body, the interior of which is connected to a plurality of connection openings. In order to increase the high-pressure strength, the interior is arranged eccentrically with respect to the longitudinal axis of the base body.
  • the high-pressure strength of the high-pressure fuel accumulator is mainly limited by the intersections between the connection openings and the interior of the base body. These drilling intersections are heavily stressed by the internal pressure and represent possible points of failure of the high-pressure fuel accumulator. During operation, stress peaks occur there, through which cracks can form in the base body.
  • a further part of the present invention is that the compressive strength of a high-pressure fuel accumulator is increased.
  • the increased compressive strength results from the greater resilience of the intersections of bores between the interior in the base body of the high-pressure fuel accumulator and the connection bores in its connecting piece.
  • a high-pressure fuel accumulator for a common rail fuel injection system for internal combustion engines which comprises a base body with an interior and at least one connection piece, the at least one connection piece containing at least one connection hole opening into the interior and forming an intersection, and the Connection bore in the area of the intersection has a chamfer-shaped widening towards the interior.
  • the base body and the interior of the high-pressure fuel accumulator are preferably both spherical or cylindrical.
  • the interior can also be along its longitudinal have any cross-sections that are optimally designed for the operating conditions of the high-pressure fuel accumulator.
  • the present invention furthermore relates to a ner driving for producing a high-pressure fuel accumulator according to the invention, the chamfer-shaped widening being applied by cutting ner driving.
  • the attachment of this chamfer is also used as a deburring process for the cutting.
  • the chamfer can be produced inexpensively by machining ner driving. Furthermore, burrs are largely avoided in a machining ner travel, so that further effort for deburring is superfluous.
  • Another advantage is that during the manufacturing process sequence surface coating and subsequent machining of the chamfer, possible material defects are removed by acid attack during electrolytic coating in the intersection area by the chamfer cutting.
  • the present invention furthermore relates to a method for producing a high-pressure fuel accumulator according to the invention, in which the base body containing the interior and the connecting pieces containing a cavity are cast in one piece from a high-strength cast material, so that the cavity has the bevel-shaped widening toward the interior.
  • the cavity replaces the A- ⁇ sc white hole, which is produced using a cutting process.
  • Casting the high-pressure fuel accumulator from a high-strength cast material enables the design of the high-pressure fuel accumulator to be adapted to an optimum in terms of its pressure resistance.
  • inner shapes can be produced, but also outer shapes that are ideally adapted to the stresses that occur during operation.
  • the shape of the high-pressure fuel accumulator by casting offers the possibility of realizing construction ideas to a particularly high degree due to the extensive design freedom of this process.
  • the stresses occurring during operation can be used as a basis.
  • the chamfer-like expansion contained in the high-pressure fuel reservoir according to the invention can be integrated into the high-pressure fuel reservoir during manufacture.
  • a preferred cast material from which the high-pressure fuel reservoir is cast is cast steel. Cast steel has a wide range of applications for highly stressed components and is therefore also outstandingly suitable for the method according to the invention or the high-pressure fuel accumulator according to the invention.
  • the cast material is a cast iron. This is a very inexpensive construction material.
  • a cast iron is used for the production of high-pressure fuel accumulators that has sufficient strength, preferably spheroidal graphite cast iron (GGG), particularly preferably GGG 80.
  • the numerical value 80 relates to the tensile strength of the cast iron.
  • FIG. 1 shows a cross section through a fuel high pressure accumulator according to the invention
  • FIG. 2 shows an enlarged detail from FIG. 1, which comprises the chamfer-shaped widening.
  • FIG. 1 shows a cross section through a high-pressure fuel accumulator according to the invention with a chamfer-shaped widening of the connection bore.
  • the high-pressure fuel reservoir shown in cross section comprises a base body 1, in which the longitudinal bore 2 forms an interior 5.
  • a connection piece 3 is formed on the base body 1, in which a connection bore 4 (or a cavity 4) extends perpendicular to the longitudinal bore 2.
  • the connection bore 4 opens into the longitudinal bore 2.
  • the connection piece 3 can be forged or welded to the base body 1 or the entire high-pressure fuel accumulator (including the connection piece 3 and grand body 1) can be a one-piece cast part.
  • fuel lines (not shown) lead to the individual injectors via the connection stub 3 and inject the fuel into the combustion chamber of the internal combustion engine.
  • connection bore 4 has a chamfer-shaped widening 6 towards the interior 5 in the area of the intersection of the interior 5 and the connection bore 4.
  • This configuration of the intersection with the chamfer-shaped widening 6 has the advantage that the load tensions at the most highly stressed point are reduced and consequently the strength values of the high-pressure fuel accumulator are improved.
  • FIG. 2 shows an enlarged detail Y from FIG. 1, which comprises the chamfer-shaped widening.
  • connection bore 4 is oriented perpendicular to the " longitudinal axis of the interior 5. In an embodiment (not shown) of the present invention, however, the connection bore 4 can also intersect with the longitudinal bore 2 at a different angle.
  • the chamfer-shaped expansion 6 is limited to the intersection area
  • the chamfered widening 6 has a straight course
  • the chamfered widening 6 is arcuate, which offers the possibility of the location of the maximum load with a suitable design, the contour of the chamfer is preferably straight or arched, but can also take any other course.
  • the bevel-shaped widening 6 has a sharp-edged transition 7, 8 to the connection bore 4 and / or to the interior 5. It is advantageous here that no further deburring or rounding is required at the transition from the chamfer-shaped widening 6 to the connection bore 4 and / or to the interior 5.
  • the chamfer-shaped widening 6 has a rounded transition 7, 8 to the connection bore 4 and / or to the interior 5.
  • the angle ⁇ of the chamfered widening 6 and the height h are designed in a suitable form.
  • the suitable shape depends on the dimensions of the connection bore and the longitudinal bore creating the interior (respective diameter) as well as their position relative to each other (centric or eccentric) and the associated tolerances. For example, with a diameter of the longitudinal bore of 10 mm, a diameter of the connecting bore of 3 mm and a central position, a height h of approximately 1 mm and an angle ⁇ of approximately 20 ° are advantageous.

Abstract

The invention relates to a high-pressure fuel accumulator for a common rail fuel injection system in internal combustion engines. Said accumulator comprises a base body (1) comprising an inner area (5) and at least one connection branch (3). The at least one connection branch (3) comprises at least one connecting bore (4) which communicates in the inner area (5) and which forms an intersection. The connecting bore (4) comprises a chamfer-shaped enlargement (6) in the direction of the inner area in the region of said intersection.

Description

KraftstoffhochdruckspeicherHigh-pressure fuel storage
Technisches GebietTechnical field
Ein Einspritzsystem dient der Nersorgung einer Brennkraftmaschine mit Kraftstoff. Bei dem Common-Rail-System genannten Speichereinspritzsystem sind Druckerzeugung und Einspritzung voneinander zeitlich und örtlich entkoppelt. Eine separate Hochdruckpumpe erzeugt den Einspritzdruck in einem zentralen Kraftstoffhochdruckspeicher. Der Einspritzbeginn und die Einspritzmenge werden durch Ansteuerzeitpunkt und -dauer von elektrisch betätigten Injektoren bestimmt, die über Kraftstoffleitungen mit dem Kraftstoffhochdruckspeicher verbunden sind. Im Betrieb treten in dem Kraftstoffhochdruckspeicher extrem hohe Drücke auf, weshalb an seine Drucl festigkeit sehr hohe Anforderungen gestellt werden.An injection system is used to supply an internal combustion engine with fuel. In the accumulator injection system called common rail system, pressure generation and injection are decoupled from one another in time and place. A separate high-pressure pump generates the injection pressure in a central high-pressure fuel reservoir. The start of injection and the injection quantity are determined by the activation time and duration of electrically actuated injectors which are connected to the high-pressure fuel reservoir via fuel lines. During operation, extremely high pressures occur in the high-pressure fuel accumulator, which is why very high demands are placed on its pressure resistance.
Stand der TechnikState of the art
DE-A 199 36 533 betrifft einen Kraftstoffhochdruckspeicher für ein Comrnon-Rail- Kraftstoffeinspritzsystem einer Brennkraftmaschine mit einem rohrförmigen Grundkörper, der eine in Längsrichtung verlaufende Sacklochbohrung und mehrere Anschlüsse aufweist.DE-A 199 36 533 relates to a high-pressure fuel accumulator for a Comrnon-Rail fuel injection system of an internal combustion engine with a tubular base body which has a blind hole running in the longitudinal direction and a plurality of connections.
Aus DE-A 199 49 962 ist ein weiterer Kraftstoffhochdruckspeicher für ein Common-Rail- Kraftstoffeinspritzsystem einer Brennkraftmaschine bekannt. Der Kraftstoffhochdruckspeicher besitzt einen hohlen Grundkörper, der mit mehreren Anschlussöffnungen ausgestattet ist. Der Innenraum des Grundkörpers ist dabei im Bereich der Anschlussöffnungen eben ausgebildet.From DE-A 199 49 962 a further high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine is known. The high-pressure fuel accumulator has a hollow base body that is equipped with several connection openings. The interior of the base body is flat in the area of the connection openings.
DE-A 199 45 316 bezieht sich ebenfalls auf einen Kraftstoffhochdruckspeicher für ein Common-Rail-Kraftstoffeinspritzsystem einer Brerrnkraftmaschine mit einem rohrförmigen Grundkörper, dessen Innenraum mit mehreren Anschlussöffnungen in Verbindung steht. Um die Hochdruckfestigkeit zu erhöhen, ist der Innenraum, bezogen auf die Längsachse des Grundkörpers, exzentrisch angeordnet.DE-A 199 45 316 also relates to a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine with a tubular base body, the interior of which is connected to a plurality of connection openings. In order to increase the high-pressure strength, the interior is arranged eccentrically with respect to the longitudinal axis of the base body.
Die Hochdruckfestigkeit des Kraftstoffhochdruckspeichers wird hauptsächlich durch die Nerschneidungen zwischen den Anschlussöffnungen und dem Innenraum des Grundkörpers beschränkt. Diese Bohrungsverschneidungen werden durch den Innendruck stark belastet und stellen mögliche Nersagensstellen des I raftstoffhochdruckspeichers dar. Im Betrieb treten dort Spannungsspitzen auf, durch die sich Risse in dem Grundkörper bilden können.The high-pressure strength of the high-pressure fuel accumulator is mainly limited by the intersections between the connection openings and the interior of the base body. These drilling intersections are heavily stressed by the internal pressure and represent possible points of failure of the high-pressure fuel accumulator. During operation, stress peaks occur there, through which cracks can form in the base body.
Darstellung der ErfindungPresentation of the invention
Ein Norteil der vorliegenden Erfindung ist, dass die Druckfestigkeit eines Kraftstoffhoch- druckspeichers erhöht wird. Die erhöhte Druckfestigkeit ergibt sich aufgrund einer stärkeren Belastbarkeit der Bohrungsverschneidungen zwischen dem Innenraum in dem Grundkörper des Kraftstoffhochdruckspeichers und den Anschlussbohrungen in seinem Anschlussstutzen.A further part of the present invention is that the compressive strength of a high-pressure fuel accumulator is increased. The increased compressive strength results from the greater resilience of the intersections of bores between the interior in the base body of the high-pressure fuel accumulator and the connection bores in its connecting piece.
Dieser Norteil wird erfindungsgemäß durch einen Kraftstoffhochdruckspeicher für ein Common-Rail-Kraftstoffeinspritzsystem für Brennkraftmaschinen erreicht, der einen Grundkörper mit einem Innenraum und mindestens einem Anschlussstutzen umfasst, wobei der mindestens eine Anschlussstutzen mindestens eine in den Innenraum mündende und eine Nerschneidung bildende Anschlussbohrung enthält, und die Anschlussbohrung im Bereich der Nerschneidung eine fasenförmige Aufweitung zum Innenraum hin aufweist.This northern part is achieved according to the invention by a high-pressure fuel accumulator for a common rail fuel injection system for internal combustion engines, which comprises a base body with an interior and at least one connection piece, the at least one connection piece containing at least one connection hole opening into the interior and forming an intersection, and the Connection bore in the area of the intersection has a chamfer-shaped widening towards the interior.
Durch das gezielte Anbringen der fasenf 'rmigen Aufweitung zum Innenraum des Grundkörpers hin in die Anschlussbohrung im Bereich der Nerschneidung wird der Durchmesser bzw. bei beliebiger Querschnittsform die Querschnittsfläche der seitlichen Anschlussboh- rang erweitert. Durch diese geometrische Gestaltung wird bei dem unter Hochdruck stehenden Kraftstoffhochdruckspeicher eine Reduktion der angreifenden Lastspannung au der Nerschneidung zwischen der seitlichen Anschlussbohrung und dem Innenraum erreicht. Diese Reduktion erlaubt es, die Bauteilfestigkeit auch bei gegenüber dem Stand der Technik gesteigertem ]&aftstofϊhochdruckspeicher-Innendruck zu gewährleisten.The selective attachment of the fasenf 'shaped widening towards the interior of the base body out in the connection bore in the area of Nerschneidung the diameter or at any cross-sectional shape, the cross-sectional area of the lateral Anschlussboh- is extended rank. This geometric design results in a reduction in the applied load voltage due to the intersection between the lateral connection bore and the interior in the high-pressure fuel accumulator. This reduction makes it possible to ensure the component strength even when the internal pressure of the high-pressure accumulator is increased compared to the prior art.
Vorzugsweise sind der Grundkörper und der Innenraum des Kraftstoffhochdruckspeichers beide kugelförmig oder zylindrisch. Der Innenraum kann aber auch entlang seiner Längs- achse beliebige Querschnitte aufweisen, die für die Betriebsbedingungen des Kraftstoffhochdruckspeichers optimal gestaltet sind.The base body and the interior of the high-pressure fuel accumulator are preferably both spherical or cylindrical. The interior can also be along its longitudinal have any cross-sections that are optimally designed for the operating conditions of the high-pressure fuel accumulator.
Gegenstand der vorliegenden Erfindung ist weiterhin ein Nerfahren zur Herstellung eines erfindungsgemäßen Kraftstoffhochdruckspeichers, wobei die fasenförmige Aufweitung durch ein spanendes Nerfahren angebracht wird.The present invention furthermore relates to a ner driving for producing a high-pressure fuel accumulator according to the invention, the chamfer-shaped widening being applied by cutting ner driving.
Bei spanabhebender Herstellung wird das Anbringen dieser Fase auch als Entgratprozess für die Nerschneidung genutzt. Die Fase kann mittels zerspanendem Nerfahren kostengüns- tig erzeugt werden. Ferner erfolgt bei einem zerspanenden Nerfahren eine weitgehende Vermeidung von Graten, so dass ein weiterer Aufwand zum Entgraten überflüssig ist. Ein weiterer Vorteil ist, dass bei der Fertigungsprozessfolge Oberflächenbeschichten und anschließendes zerspanendes Anbringen der Fase mögliche Materialdefekte durch Säureangriff beim elektrolytischen Beschichten im Verschneidungsbereich durch das Faseschnei- den entfernt werden.In the case of machining production, the attachment of this chamfer is also used as a deburring process for the cutting. The chamfer can be produced inexpensively by machining ner driving. Furthermore, burrs are largely avoided in a machining ner travel, so that further effort for deburring is superfluous. Another advantage is that during the manufacturing process sequence surface coating and subsequent machining of the chamfer, possible material defects are removed by acid attack during electrolytic coating in the intersection area by the chamfer cutting.
Gegenstand der vorliegenden Erfindung ist weiterhin ein Verfahren zur Herstellung eines erfindungsgemäßen Kraftstoffhochdruckspeichers, wobei der den Innenraum enthaltende Grundkörper und die einen Hohlraum enthaltenden Anschlussstutzen aus einem hochfesten Gusswerkstoff einstückig gegossen werden, so dass der Hohlraum die fasenförmige Aufweitung zum Innenraum hin aufweist. Der Hohlraum ersetzt dabei die A-αscWussbohrung, die mit einem spanenden Verfahren hergestellt wird. Das Gießen des Kraftstoffhochdruckspeichers aus einem hochfesten Gusswerkstoff ermöglicht eine Anpassung der Konstruktion des Kraftstofϊhochdruckspeichers an ein Optimum hinsichtlich seiner Druckfestigkeit. Dabei können vor allem Innenformen, aber auch Außenformen hergestellt werden, die ideal an die im Betrieb auftretenden Spannungen angepasst sind.The present invention furthermore relates to a method for producing a high-pressure fuel accumulator according to the invention, in which the base body containing the interior and the connecting pieces containing a cavity are cast in one piece from a high-strength cast material, so that the cavity has the bevel-shaped widening toward the interior. The cavity replaces the A-αsc white hole, which is produced using a cutting process. Casting the high-pressure fuel accumulator from a high-strength cast material enables the design of the high-pressure fuel accumulator to be adapted to an optimum in terms of its pressure resistance. Above all, inner shapes can be produced, but also outer shapes that are ideally adapted to the stresses that occur during operation.
Die Formgebung des Kraftstoffhochdruckspeichers durch Gießen bietet aufgrund der weitgehenden Gestaltungsfreiheit dieses Verfahrens in besonders hohem Maße die Möglichkeit, Konstruktionsideen zu verwirklichen. Dabei können die im Betrieb auftretenden Beanspruchungen zugrundegelegt werden. So kann u.a. die im erfindungsgemäßen Kraftstoffhochdruckspeicher enthaltene fasenförmige Aufweitung schon bei der Herstellung in den Kraftstoffhochdruckspeicher integriert werden. Ein bevorzugter Gusswerkstoff, aus dem der Kraftstoffhochdruckspeicher gegossen wird, ist ein Stahlguss. Stahlguss besitzt einen wei- ten Anwendungsbereich für hochbeanspruchte Bauteile und ist daher auch hervorragend für das erfindungsgemäße Verfahren bzw. den erfindungsgemäßen Kraftstoffhochdruckspei- cher geeignet. In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung ist der Gusswerkstoff ein Gusseisen. Dies ist ein sehr kostengünstiger Konstruktionswerkstoff. Dabei wird ein Gusseisen zur Herstellung von Kraftstoffhochdruckspeichern verwendet, das eine ausreichende Festigkeit aufweist, bevorzugt Gusseisen mit Kugelgraphit (GGG), besonders bevorzugt GGG 80. Der Zahlenwert 80 bezieht sich auf die Zugfestigkeit des Gusseisens.The shape of the high-pressure fuel accumulator by casting offers the possibility of realizing construction ideas to a particularly high degree due to the extensive design freedom of this process. The stresses occurring during operation can be used as a basis. For example, the chamfer-like expansion contained in the high-pressure fuel reservoir according to the invention can be integrated into the high-pressure fuel reservoir during manufacture. A preferred cast material from which the high-pressure fuel reservoir is cast is cast steel. Cast steel has a wide range of applications for highly stressed components and is therefore also outstandingly suitable for the method according to the invention or the high-pressure fuel accumulator according to the invention. In a further preferred embodiment of the present invention, the cast material is a cast iron. This is a very inexpensive construction material. A cast iron is used for the production of high-pressure fuel accumulators that has sufficient strength, preferably spheroidal graphite cast iron (GGG), particularly preferably GGG 80. The numerical value 80 relates to the tensile strength of the cast iron.
Zeichnungdrawing
Anhand der Zeichnung wird die Erfindung nachstehend näher erläutert.The invention is explained in more detail below with the aid of the drawing.
Es zeigt:It shows:
Figur 1 einen Querschnitt durch einen erfindungsgemäßen Kraftstoffl ochdruckspeicher und1 shows a cross section through a fuel high pressure accumulator according to the invention and
Figur 2 ein vergrößertes Detail aus Figur 1, das die fasenförmige Aufweitung umfasst.FIG. 2 shows an enlarged detail from FIG. 1, which comprises the chamfer-shaped widening.
Ausführungsvariantenvariants
Figur 1 zeigt einen Querschnitt durch einen erfmdungsgemäßen Kraftstoffhochdruckspei- cher mit einer fasenförmigen Aufweitung der Anschlussbohrung.FIG. 1 shows a cross section through a high-pressure fuel accumulator according to the invention with a chamfer-shaped widening of the connection bore.
Der im Querschnitt dargestellte Kraftstoffhochdruckspeicher umfasst einen Grundkörper 1, in dem die Längsbohrung 2 einen Innenraum 5 bildet. An dem Grundkörper 1 ist ein Anschlussstutzen 3 ausgebildet, in dem sich eine Anschlussbohrung 4 (bzw. ein Hohlraum 4) senkrecht zur Längsbohrung 2 erstreckt. Die Ajαschlussbohrung 4 mündet in die Längsbohrung 2. Der Anschlussstutzen 3 kann an dem Grundkörper 1 angeschmiedet oder angeschweißt sein oder der gesamte Kraftstoffhochdruckspeicher (incl. Anschlussstutzen 3 und Grandkörper 1) kann ein einstückiges Gussteil sein. Über den Ansclilussstutzen 3 führen beispielsweise (nicht dargestellte) Kraftstoffleitungen zu den einzelnen Injektoren, die den Kraftstoff in den Brennraum der Brennkraftmaschine einspritzen.The high-pressure fuel reservoir shown in cross section comprises a base body 1, in which the longitudinal bore 2 forms an interior 5. A connection piece 3 is formed on the base body 1, in which a connection bore 4 (or a cavity 4) extends perpendicular to the longitudinal bore 2. The connection bore 4 opens into the longitudinal bore 2. The connection piece 3 can be forged or welded to the base body 1 or the entire high-pressure fuel accumulator (including the connection piece 3 and grand body 1) can be a one-piece cast part. For example, fuel lines (not shown) lead to the individual injectors via the connection stub 3 and inject the fuel into the combustion chamber of the internal combustion engine.
Die Anschlussbohrung 4 weist im Bereich der Verschneidung von Innenraum 5 und An- schlussbohrung 4 eine fasenförmige Aufweitung 6 zum Innenraum 5 hin auf. Diese Gestaltung der Verschneidung mit der fasenförmigen Aufweitung 6 hat den Vorteil, dass die Lastspannungen an der höchstbelasteten Stelle reduziert und folglich die Festigkeitswerte des Kraftstoffhochdruckspeichers verbessert werden. Figur 2 zeigt ein vergrößertes Detail Y aus Figur 1, das die fasenförmige Aufweitung umfasst.The connection bore 4 has a chamfer-shaped widening 6 towards the interior 5 in the area of the intersection of the interior 5 and the connection bore 4. This configuration of the intersection with the chamfer-shaped widening 6 has the advantage that the load tensions at the most highly stressed point are reduced and consequently the strength values of the high-pressure fuel accumulator are improved. FIG. 2 shows an enlarged detail Y from FIG. 1, which comprises the chamfer-shaped widening.
Im Detail Y ist die fasenförmige Aufweitung 6 der seitlichen Anschlussbohrung 4 hin zum Innenraum 5 dargestellt. Die seitliche Anschlussbohrung 4 ist dabei senkrecht zur "Längsachse des Innenraums 5 orientiert. In einer (nicht dargestellten) Ausführungsform der vorliegenden Erfindung kann die Anschlussbohrung 4 hingegen auch in einem anderen Winkel mit der Längsbohrung 2 verschneiden. Die fasenförmige Aufweitung 6 beschränkt sich auf den Verschneidungsbereich. In der in Figur 2 dargestellten bevorzugten Ausführungsform der vorliegenden Erfindung hat die fasenförmige Aufweitung 6 einen geradlinigen Verlauf. Bei einer weiteren (nicht dargestellten) bevorzugten Ausführungsform der vorliegenden Erfindung verläuft die fasenförmige Aufweitung 6 bogenförmig. Dies bietet die Möglichkeit, den Ort der maximalen Belastung bei geeigneter Ausführung an eine bestimmte Stelle des Bogens zu legen. Die Kontur der Fase ist demnach vorzugsweise geradlinig oder bogenförmig, kann aber auch einen beliebigen anderen Verlauf nehmen.In detail Y, the bevel-shaped widening 6 of the lateral connection bore 4 towards the interior 5 is shown. The lateral connection bore 4 is oriented perpendicular to the " longitudinal axis of the interior 5. In an embodiment (not shown) of the present invention, however, the connection bore 4 can also intersect with the longitudinal bore 2 at a different angle. The chamfer-shaped expansion 6 is limited to the intersection area In the preferred embodiment of the present invention shown in Figure 2, the chamfered widening 6 has a straight course, in a further (not shown) preferred embodiment of the present invention the chamfered widening 6 is arcuate, which offers the possibility of the location of the maximum load with a suitable design, the contour of the chamfer is preferably straight or arched, but can also take any other course.
In einer bevorzugten Ausführungsform der vorliegenden Erfindung weist die fasenförmige Aufweitung 6 einen scharfkantigen Übergang 7, 8 zur Anschlussbohrung 4 und/oder zum Innenraum 5 hin auf. Vorteilhaft ist dabei, dass kein weiterer Entgrat- oder Verrundungs- aufwand an dem Übergang der fasenförmigen Aufweitung 6 zur Anschlussbohrung 4 und/oder zum Innenraum 5 anfällt.In a preferred embodiment of the present invention, the bevel-shaped widening 6 has a sharp-edged transition 7, 8 to the connection bore 4 and / or to the interior 5. It is advantageous here that no further deburring or rounding is required at the transition from the chamfer-shaped widening 6 to the connection bore 4 and / or to the interior 5.
In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung weist die fa- senförmige Aufweitung 6 einen abgerundeten Übergang 7, 8 zur Anschlussbohrung 4 und/oder zum Innenraum 5 hin auf.In a further preferred embodiment of the present invention, the chamfer-shaped widening 6 has a rounded transition 7, 8 to the connection bore 4 and / or to the interior 5.
Der Winkel α der fasenförmigen Aufweitung 6 und die Höhe h werden in geeigneter Form gestaltet. Die geeignete Form hängt dabei von den Dimensionen der Anschlussbohrung und der den Innenraum erzeugenden Längsbohrung (jeweilige Durchmesser) sowie deren Lage zueinander (zentrisch oder exzentrisch) sowie den damit verbundenen Toleranzen. Beispielsweise sind bei einem Durchmesser der Längsbohrung von 10mm, einem Durchmesser der AnscMussbohrung von 3mm und einer zentrischen Lage eine Höhe h von ca. 1mm und ein Winkel α von ca. 20° vorteilhaft. BezugszeichenlisteThe angle α of the chamfered widening 6 and the height h are designed in a suitable form. The suitable shape depends on the dimensions of the connection bore and the longitudinal bore creating the interior (respective diameter) as well as their position relative to each other (centric or eccentric) and the associated tolerances. For example, with a diameter of the longitudinal bore of 10 mm, a diameter of the connecting bore of 3 mm and a central position, a height h of approximately 1 mm and an angle α of approximately 20 ° are advantageous. LIST OF REFERENCE NUMBERS
Grundkörper Längsbohrung Anschlussstutzen AnscWussbohrung/Ηohlraum Innenraum fasenförmige Aufweitung Übergang der fasenförmigen Aufweitung zur A-nschlussbohrung Übergang der fasenförmigen Aufweitung zum Innenraum Basic body, longitudinal bore, connecting piece, connecting bore / cavity, interior, bevel-shaped expansion Transition of the bevel-shaped expansion to the connecting bore Transition of the bevel-shaped expansion to the interior

Claims

Patentansprüche claims
1. Kraftstoffhochdrackspeicher für ein Common-Rail-Kraftstoffeinspritzsystem für Brerinlα-iftmaschinen, der einen Grundkörper (1) mit einem Innenraum (5) und mindestens einem Anschlussstutzen (3) umfasst, wobei der mindestens eine Anschlussstutzen (3) mindestens eine in den Innenraum (5) mündende und eine Verschneidung bildende Anschlussbohrung (4) enthält, dadurch gekennzeichnet, dass die Anschlussbohrung (4) im Bereich der Verschneidung eine fasenförmige Aufweitung (6) zum Innenraum (5) hin aufweist.1. High-pressure fuel accumulator for a common rail fuel injection system for Brerinlα-ift machines, which comprises a base body (1) with an interior (5) and at least one connection piece (3), the at least one connection piece (3) at least one in the interior ( 5) contains a connecting bore (4) which opens and forms a intersection, characterized in that the connection bore (4) has a chamfer-shaped widening (6) towards the interior (5) in the region of the intersection.
2. Kraftstoffhochdruckspeicher gemäß Ansprach 1, dadurch gekennzeichnet, dass der Grundkörper (1) und der Innenraum (5) beide kugelförmig oder zylindrisch sind.2. High-pressure fuel reservoir according spoke 1, characterized in that the base body (1) and the interior (5) are both spherical or cylindrical.
3. Kraftstoffhochdruckspeicher gemäß Ansprach 1, dadurch gekennzeichnet, dass die fasenförmige Aufweitung (6) einen geradlinigen Verlauf hat.3. High-pressure fuel accumulator according to spoke 1, characterized in that the chamfer-shaped expansion (6) has a straight course.
4. Kraftstoffhochdruckspeicher gemäß Anspruch 1, dadurch gekennzeichnet, dass die fasenförmige Aufweitung (6) bogenförmig verläuft.4. High-pressure fuel accumulator according to claim 1, characterized in that the chamfer-shaped widening (6) extends in an arc.
5. Kraftstoffhochdruckspeicher gemäß Anspruch 1, dadurch gekennzeichnet, dass die fasenförmige Aufweitung (6) einen scharfkantigen Übergang (7, 8) zur Anschlussbohrung und/oder zum Innenraum hin aufweist.5. High-pressure fuel accumulator according to claim 1, characterized in that the chamfer-shaped expansion (6) has a sharp-edged transition (7, 8) to the connection bore and / or to the interior.
6. Kraftstoffhochdruckspeicher gemäß Anspruch 1, dadurch gekennzeichnet, dass die fasenförmige Aufweitung (6) einen abgerundeten Übergang (7, 8) zur Anschlussbohrung und/oder zum Innenraum hin aufweist.6. High-pressure fuel accumulator according to claim 1, characterized in that the chamfer-shaped expansion (6) has a rounded transition (7, 8) to the connection bore and / or to the interior.
7. Verfahren zur Herstellung eines Kraftstoffhochdrackspeichers gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die fasenförmige Aufweitung (6) durch ein spanendes Verfahren angebracht wird.7. A method for producing a high-pressure fuel accumulator according to one of claims 1 to 6, characterized in that the chamfer-shaped widening (6) is applied by a cutting process.
8. Verfahren zur Herstellung eines Kraftstoffhochdrackspeichers gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der den Innenraum enthaltende Grundkörper und die einen Hohlraum enthaltenden Anschlussstutzen (3) aus einem hochfes- ten Gusswerkstoff einstückig gegossen werden, wobei der Hohlraum die fasenförmige8. A method for producing a high-pressure fuel accumulator according to one of claims 1 to 6, characterized in that the base body containing the interior and the connecting piece (3) containing a cavity are cast in one piece from a high-strength cast material, the cavity being the chamfer-shaped
Auf weitung (6) zum Innenraum hin aufweist. Has widening (6) towards the interior.
PCT/DE2003/003099 2003-02-07 2003-09-18 High-pressure fuel accumulator WO2004070193A1 (en)

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DE2003105078 DE10305078A1 (en) 2003-02-07 2003-02-07 High pressure fuel store for common rail fuel injection system has connecting boring made with beveled widening
DE10305078.7 2003-02-07

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