EP1423601A1 - High pressure fuel accumulator for an accumulator injection system - Google Patents

High pressure fuel accumulator for an accumulator injection system

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Publication number
EP1423601A1
EP1423601A1 EP02774308A EP02774308A EP1423601A1 EP 1423601 A1 EP1423601 A1 EP 1423601A1 EP 02774308 A EP02774308 A EP 02774308A EP 02774308 A EP02774308 A EP 02774308A EP 1423601 A1 EP1423601 A1 EP 1423601A1
Authority
EP
European Patent Office
Prior art keywords
pressure fuel
rib
fuel accumulator
base body
accumulator according
Prior art date
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.)
Granted
Application number
EP02774308A
Other languages
German (de)
French (fr)
Other versions
EP1423601B1 (en
Inventor
Michael Wirkowski
Eckbert Zander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1423601A1 publication Critical patent/EP1423601A1/en
Application granted granted Critical
Publication of EP1423601B1 publication Critical patent/EP1423601B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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 present invention relates to a high-pressure fuel accumulator for a memory injection system of internal combustion engines, in particular for Co mon-rail systems.
  • a high-pressure pump conveys the fuel to be injected from a tank to a central high-pressure fuel reservoir (rail). Individual fuel lines lead from this rail to the respective injectors of the cylinders of the internal combustion engine. The injectors are controlled individually depending on the operating parameters of the internal combustion engine in order to inject fuel into the respective combustion chamber.
  • 3 and 4 show a high-pressure fuel accumulator according to the prior art.
  • the high-pressure fuel accumulator comprises a base body 1, which has a longitudinal bore 3, from which a plurality of connection bores 2 for the injectors extend. Since the accumulator injection systems work at very high pressures, strength problems occur in particular at the transition areas marked with arrows in FIG. 3 between the longitudinal bore 3 and the connection bores 2, which problems arise there
  • a high-pressure fuel accumulator is also known, in which an interior is formed from two circular-cylindrical recesses which are arranged parallel to one another in the longitudinal direction and are connected to one another.
  • the connection bores for the injectors are arranged in a connection area which is provided between the two longitudinal bores and is in the form of a saddle.
  • this high-pressure fuel accumulator has a relatively large width. Furthermore, the production of the two parallel holes, for example by means of deep hole drilling, is very complex.
  • the high-pressure fuel accumulator according to the invention for an accumulator injection system with the features of claim 1 has a particularly compact and space-saving design and has a significantly improved high pressure resistance at the transition areas between an elongated recess and the connection bores for injectors of the injection system.
  • the high-pressure accumulator according to the invention is constructed in such a way that a longitudinal recess is substantially cylindrical and has at least one rib-shaped section on its inner circumference. According to the invention, the connection bores for the injectors open into the longitudinal recess at the rib-shaped section.
  • the inward design of the rib-shaped section in the longitudinal recess Due to the inward design of the rib-shaped section in the longitudinal recess, favorable stress conditions are obtained, in particular at the end of the rib-shaped section, so that the stresses at the intersections of the bores can be reduced.
  • the inwardly projecting rib-shaped projection thus positions the intersection in the direction of the central axis of the essentially cylindrical longitudinal recess, so that the tangential stresses or circumferential stresses on the intersection are significantly lower.
  • the pressure pulse strength can also be further increased by the configuration of the high-pressure accumulator according to the invention.
  • the rib-shaped section is particularly preferably formed on the inner circumference of the longitudinal recess over the entire length of the base body.
  • a plurality of rib-shaped sections running parallel to one another are formed on the inner circumference of the base body. This makes it possible for the connecting lines for the injectors or inlets / outlets to be located at different points on the Circumference of the elongated body can be arranged.
  • two rib-shaped sections are formed on the inner circumference, which are arranged opposite to each other. As a result, an improved rigidity of the high-pressure fuel accumulator can be achieved.
  • three rib-shaped sections are formed on the inner circumference of the base body.
  • the three rib-shaped sections are each offset by 120 ° from one another.
  • a plurality of connection bores in one sectional plane i.e. can be arranged at a height in the longitudinal direction of the base body.
  • An acute angle is preferably formed at the transition between the connection bore and the rib-shaped section. As a result, the loads can be kept very low.
  • the rib-shaped sections are preferably rounded.
  • the protruding end is particularly preferred of the rib-shaped sections in the form of a semi-circle in section, the connection bore being guided through the most protruding region of the rib-shaped section.
  • FIG. 1 shows a schematic sectional view of a high-pressure fuel accumulator according to a first exemplary embodiment of the present invention
  • FIG. 2 shows a schematic sectional view of a high-pressure fuel accumulator according to a second exemplary embodiment of the present invention
  • Figure 3 is a schematic longitudinal sectional view of a high-pressure fuel accumulator according to the prior art
  • Figure 4 is a sectional view taken along line A-A of the
  • a first exemplary embodiment according to the present invention is described below with reference to FIG. 1.
  • the high-pressure fuel accumulator consists of a base body 1, which is elongated and from which a plurality of connection bores 2 extend, which form injectors on individual cylinders of an internal combustion engine. machine.
  • the base body 1 is formed with an inner longitudinal bore 3, which is essentially cylindrical.
  • a rib-shaped section 4 is formed on the inner circumference of the longitudinal bore 3 and extends over the entire length of the base body 1.
  • the radius R of the essentially cylindrical bore is selected such that the necessary storage volume is provided by the inwardly directed rib-shaped section 4 despite the volume reduction.
  • connection bore 2 is arranged on the base body 1 in such a way that the connection bore 2 is guided through the rib-shaped section 4 and the intersection of the holes between the longitudinal bore 3 and the connection bore 2 is arranged at the end of the rib-shaped section 4.
  • the rib-shaped section 4 is formed such that its end describes a semicircle in section, so that at the intersection, i.e. Transition area between the bore 2 and the rib-shaped section 4 results in an acute angle ⁇ .
  • connection bore 2 on the rib-shaped section 4 results in a favorable stress distribution, since the pressure prevailing in the base body 1 acts on the rib-shaped section 4 from both sides, so that the resulting forces at the intersection of the holes are significantly reduced. It is also important that the influence of the tangential tension or circumferential tension of the longitudinal bores on the intersection is less. This significantly reduces the risk of cracks forming at the transition area between the connection bore 2 and the longitudinal bore 3.
  • the high-pressure accumulator according to the invention can thus be used in particular for the higher pressures to be expected in the near future in the injection systems are used or more cost-effective materials with lower high pressure resistance can be used for the high-pressure fuel storage.
  • a high-pressure fuel accumulator according to a second exemplary embodiment of the present invention is described below with reference to FIG.
  • the same or functionally the same parts are designated with the same reference numerals as in the first embodiment.
  • the high-pressure fuel accumulator likewise comprises an elongate base body 1, in which a continuous longitudinal recess 3 is formed.
  • three rib-shaped sections 4, 5, 6 are formed on the inner circumference of the longitudinal recess 3 in the second exemplary embodiment. As shown in FIG. 2, the three rib-shaped sections 4, 5, 6 are arranged at 120 ° each around the inner circumference of the essentially cylindrical longitudinal recess 3. The rib-shaped sections 4, 5, 6 protrude into the longitudinal recess 3 and are rounded at their end.
  • a first connection bore 2 is arranged such that the intersection of the bores with the longitudinal recess 3 is arranged on the first rib-shaped section 4.
  • a second connection bore 7 is also passed through the second rib-shaped section 5 (cf. FIG. 2).
  • the arrangement of a plurality of rib-shaped sections 4, 5, 6 thus makes it possible for the connection bores in the longitudinal direction of the base body 1 to be at the same height at different positions on the circumference of the Base body 1 can be arranged.
  • .0 can be decorated, since several holes can be distributed at the same height on the circumference of the base body 1.
  • the radius R is chosen such that the necessary storage volume is available.
  • the rib-shaped section 4, 5 protrudes inwards in comparison to the cylindrical inner surface of the longitudinal recess by a distance D of more than 2 mm, as a result of which high stability and low internal stresses at high pressure of 1000 to 2500 bar are achieved in the fuel distributor, with an inner diameter the inner surface from 7 to 15mm.
  • the second exemplary embodiment corresponds to the first exemplary embodiment, so that reference can be made to the description given there.
  • the present invention thus relates to a high-pressure fuel accumulator for an accumulator injection system of internal combustion engines with a base body 1, comprising a longitudinal recess 3, from which a plurality of connection bores 2, 7 extend.
  • the inner surface of the longitudinal recess 3 is essentially cylindrical, at least one rib-shaped section 4 being formed on the inner circumference of the longitudinal recess 3, in which a connection bore 2 opens into the longitudinal recess 3.

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

Abstract

The invention relates to a high pressure fuel accumulator for an accumulator injection system in internal injection engines, comprising a base body (1) which is provided with a longitudinal recess (3) which has a plurality of connecting bores (2, 7) emanating therefrom. The inner chamber of the longitudinal recess (3) is essentially cylindrical in shape and has at least one rib shaped section (4) on the inner perimeter of the longitudinal recess (3) into which a connecting bore formed in the longitudinal recess (3) leads.

Description

Beschreibungdescription
Kraftstoffhochdruckspeicher für ein SpeichereinspritzsystemHigh-pressure fuel accumulator for an accumulator injection system
Die vorliegende Erfindung betrifft einen Kraftstoffhochdruckspeicher für ein Speichereinspritzsystem von Brennkraftmaschinen, insbesondere für Co mon-Rail-Syste e .The present invention relates to a high-pressure fuel accumulator for a memory injection system of internal combustion engines, in particular for Co mon-rail systems.
Bei Speichereinspritzsyste en fördert eine Hochdruckpumpe den einzuspritzenden Kraftstoff aus einem Tank in einen zentralen Kraftstoffhochdruckspeicher (Rail) . Von diesem Rail führen einzelne Kraftstoffleitungen zu den jeweiligen Injektoren der Zylinder der Brennkraftmaschine. Die Injektoren werden in Abhängigkeit von den Betriebsparametern der Brennkraftmaschine einzeln angesteuert, um Kraftstoff in den jeweiligen Brennraum einzuspritzen. In den Figuren 3 und 4 ist ein Kraftstoffhochdruckspeicher gemäß dem Stand der Technik dargestellt. Wie in den Figuren gezeigt, umfasst der Kraft- stoffhochdruckspeicher einen Grundkörper 1, welcher eine Längsbohrung 3 aufweist, von welchem mehrere Anschlussbohrungen 2 für die Injektoren abgehen. Da die Speichereinspritzsysteme mit sehr hohen Drücken arbeiten, treten insbesondere an den in der Figur 3 mit Pfeilen gekennzeichneten Übergangsbereichen zwischen der Längsbohrung 3 und den An- schlussbohrungen 2 Festigkeitsprobleme auf, welche dort zuIn accumulator injection systems, a high-pressure pump conveys the fuel to be injected from a tank to a central high-pressure fuel reservoir (rail). Individual fuel lines lead from this rail to the respective injectors of the cylinders of the internal combustion engine. The injectors are controlled individually depending on the operating parameters of the internal combustion engine in order to inject fuel into the respective combustion chamber. 3 and 4 show a high-pressure fuel accumulator according to the prior art. As shown in the figures, the high-pressure fuel accumulator comprises a base body 1, which has a longitudinal bore 3, from which a plurality of connection bores 2 for the injectors extend. Since the accumulator injection systems work at very high pressures, strength problems occur in particular at the transition areas marked with arrows in FIG. 3 between the longitudinal bore 3 and the connection bores 2, which problems arise there
Rissen führen, welche sich schnell erweitern. Daher werden im Stand der Technik für die Grundkörper 1 sehr teure, hochfeste Materialien verwendet und aufwendige Nachbearbeitungsschritte an den rissgefährdeten Stellen, wie z.B. Entgraten oder Ku- gelstrahlen, durchgeführt. Somit sind die bekannten Kraftstoffhochdruckspeicher sehr arbeitsintensiv und teuer in ihrer Herstellung. Aus der DE-199 45 786 Cl ist weiterhin ein Kraftstoffhochdruckspeicher bekannt, bei dem ein Innenraum aus zwei kreiszylindrischen Ausnehmungen gebildet sind, welche in Längsrichtung parallel zueinander angeordnet sind und miteinander in Verbindung stehen. Die Anschlussbohrungen für die Injektoren sind dabei in einem zwischen den beiden Längsbohrungen vorgesehenen Verbindungsbereich angeordnet, welcher sattelförmig ausgebildet ist. Dadurch können am Übergangsbereich zwischen der Längsbohrung und der Anschlussbohrung günstige Spannungsverhältnisse erzeugt werden. Allerdings weist dieser Kraftstoffhochdruckspeicher aufgrund der parallelen Anordnung der beiden Längsbohrungen eine relativ große Breite auf. Desweiteren ist die Herstellung der zwei parallelen Bohrungen z.B. mittels Tieflochbohren sehr aufwendig.Lead cracks, which expand quickly. For this reason, very expensive, high-strength materials are used for the base body 1 in the prior art, and expensive post-processing steps are carried out at the points at risk of cracking, such as deburring or shot blasting. The known high-pressure fuel accumulators are therefore very labor-intensive and expensive to manufacture. From DE-199 45 786 C1 a high-pressure fuel accumulator is also known, in which an interior is formed from two circular-cylindrical recesses which are arranged parallel to one another in the longitudinal direction and are connected to one another. The connection bores for the injectors are arranged in a connection area which is provided between the two longitudinal bores and is in the form of a saddle. As a result, favorable stress conditions can be generated at the transition area between the longitudinal bore and the connection bore. However, due to the parallel arrangement of the two longitudinal bores, this high-pressure fuel accumulator has a relatively large width. Furthermore, the production of the two parallel holes, for example by means of deep hole drilling, is very complex.
Es ist daher Aufgabe der vorliegenden Erfindung, bei einfacher und kostengünstiger Herstellbarkeit einen Kraftstoffhochdruckspeicher für ein Speichereinspritzsystem bereitzustellen, welcher bei einem kompakten Aufbau eine ver- besserte Hochdruckfestigkeit aufweist.It is therefore an object of the present invention to provide a high-pressure fuel accumulator for an accumulator injection system which is simple and inexpensive to produce and which has an improved high-pressure strength with a compact structure.
Diese Aufgabe wird durch einen Kraftstoffhochdruckspeicher mit den Merkmalen des Patentanspruches 1 gelöst. Die Unteransprüche zeigen vorteilhafte Weiterbildungen der Erfindung.This object is achieved by a high-pressure fuel accumulator with the features of patent claim 1. The subclaims show advantageous developments of the invention.
Der erfindungsgemäße Kraftstoffhochdruckspeicher für ein Speichereinspritzsystem mit den Merkmalen des Patentanspruchs 1 ist besonders kompakt und platzsparend aufgebaut und weist eine deutlich verbesserte Hochdruckfestigkeit an den Über- gangsbereichen zwischen einer länglichen Ausnehmung und den Anschlussbohrungen für Injektoren des Einspritzsystems auf. Der erfindungsgemäße Hochdruckspeicher ist dabei derart aufgebaut, dass eine in einem Grundkörper vorgesehene Längs- ausnehmung im Wesentlichen zylinderförmig ausgebildet ist und an ihrem Innenumfang wenigstens einen rippenförmigen Abschnitt aufweist. Die Anschlussbohrungen für die Injektoren münden erfindungsgemäß am rippenförmigen Abschnitt in die L ngsausnehmung. Durch die nach innen gerichtete Ausbildung des rippenförmigen Abschnitts in der Langsausnehmung werden dabei günstige Spannungsverhältnisse inbesondere am Ende des rippenförmigen Abschnitts erhalten, so dass an den Bohrungs- verschneidungen die Spannungen reduziert werden können. Der nach Innen vorstehende rippenförmige Ansatz positioniert die Verschneidung somit Richtung Mittelachse der im wesentlichen zylinderförmigen Langsausnehmung, so dass die Tangential- spannungen bzw. UmfangsSpannungen an der Verschneidung deutlich geringer sind. Dadurch ist es erfindungsgemäß möglich, dass weniger teuere Materialien für die Hochdruckspeicher verwendet werden können, bzw. dass die Hochdruckspeicher für noch höhere Drücke, verwendbar ist. Insbesondere kann durch die erfindungsgemäße Ausbildung des Hochdruckspeichers auch die Druckpulsfestigkeit weiter gesteigert werden.The high-pressure fuel accumulator according to the invention for an accumulator injection system with the features of claim 1 has a particularly compact and space-saving design and has a significantly improved high pressure resistance at the transition areas between an elongated recess and the connection bores for injectors of the injection system. The high-pressure accumulator according to the invention is constructed in such a way that a longitudinal recess is substantially cylindrical and has at least one rib-shaped section on its inner circumference. According to the invention, the connection bores for the injectors open into the longitudinal recess at the rib-shaped section. Due to the inward design of the rib-shaped section in the longitudinal recess, favorable stress conditions are obtained, in particular at the end of the rib-shaped section, so that the stresses at the intersections of the bores can be reduced. The inwardly projecting rib-shaped projection thus positions the intersection in the direction of the central axis of the essentially cylindrical longitudinal recess, so that the tangential stresses or circumferential stresses on the intersection are significantly lower. This makes it possible according to the invention that less expensive materials can be used for the high-pressure accumulator, or that the high-pressure accumulator can be used for even higher pressures. In particular, the pressure pulse strength can also be further increased by the configuration of the high-pressure accumulator according to the invention.
Besonders bevorzugt ist der rippenförmige Abschnitt am Innenumfang der Langsausnehmung über die gesamte Länge des Grundkörpers ausgebildet. Dadurch ist es beispielsweise möglich, dass der erfindungsgemäße Hochdruckspeicher aus gezogenen Rohren hergestellt werden kann, wodurch sich eine deutliche Verbilligung der Herstellung im Vergleich mit den bekannten Hochdruckspeichern ergibt.The rib-shaped section is particularly preferably formed on the inner circumference of the longitudinal recess over the entire length of the base body. This makes it possible, for example, for the high-pressure accumulator according to the invention to be produced from drawn tubes, which results in a significant reduction in the cost of manufacture in comparison with the known high-pressure accumulators.
Gemäß einer bevorzugten Ausgestaltung der vorliegenden Erfin- düng sind am Innenumfang des Grundkörpers mehrere, zueinander parallel verlaufende rippenförmige Abschnitte gebildet. Dadurch ist es möglich, dass die Anschlussleitungen für die Injektoren oder Zuläufe/Abläufe an unterschiedlichen Stellen am Umfang des länglichen Grundkörpers angeordnet werden können.According to a preferred embodiment of the present invention, a plurality of rib-shaped sections running parallel to one another are formed on the inner circumference of the base body. This makes it possible for the connecting lines for the injectors or inlets / outlets to be located at different points on the Circumference of the elongated body can be arranged.
Dadurch können größere Freiheitsgrade hinsichtlich der Anordnung der Leitungen in den meist beengten Motorräumen von Kraftfahrzeugen erhalten werden.As a result, greater degrees of freedom with regard to the arrangement of the lines in the mostly cramped engine compartments of motor vehicles can be obtained.
55
Besonders bevorzugt sind dabei zwei rippenförmige Abschnitte am Innenumfang gebildet, welche entgegengesetzt zueinander angeordnet sind. Dadurch kann weiter eine verbesserte Stei- figkeit des Kraftstoffhochdruckspeichers erreicht werden.Particularly preferably, two rib-shaped sections are formed on the inner circumference, which are arranged opposite to each other. As a result, an improved rigidity of the high-pressure fuel accumulator can be achieved.
.0.0
Gemäß einer anderen besonders bevorzugten Ausbildung der vorliegenden Erfindung sind drei rippenförmige Abschnitte am Innenumfang des Grundkörpers gebildet. Die drei rippenförmigen Abschnitte sind dabei zueinander jeweils um 120° versetzt an-According to another particularly preferred embodiment of the present invention, three rib-shaped sections are formed on the inner circumference of the base body. The three rib-shaped sections are each offset by 120 ° from one another.
L5 geordnet. Dadurch kann die Stabilität des Hochdruckspeichers weiter verbessert werden.L5 ordered. This can further improve the stability of the high-pressure accumulator.
Durch die Anordnung von mehreren rippenförmigen Abschnitten am Innenumfang des Grundkörpers kann weiterhin erreicht wer- 20 den, dass, abhängig von der Anzahl der rippenförmigen Abschnitte, mehrere Anschlussbohrungen in einer Schnittebene, d.h. in einer Höhe in Längsrichtung des Grundkörpers, angeordnet werden können.By arranging a plurality of rib-shaped sections on the inner circumference of the base body, it can further be achieved that, depending on the number of rib-shaped sections, a plurality of connection bores in one sectional plane, i.e. can be arranged at a height in the longitudinal direction of the base body.
5 Vorzugsweise ist am Übergang zwischen der Anschlussbohrung und dem rippenförmigen Abschnitt ein spitzer Winkel gebildet. Dadurch können die Belastungen sehr gering gehalten werden.5 An acute angle is preferably formed at the transition between the connection bore and the rib-shaped section. As a result, the loads can be kept very low.
Um besonders günstige Spannungsverhältnisse, d.h. sehr ge- 0 ringe Spannungen, an der Bohrungsverschneidung zwischen der Langsausnehmung und den Anschlussbohrungen zu erhalten, sind die rippenförmigen Abschnitte vorzugsweise abgerundet ausgebildet. Besonders bevorzugt ist dabei das vorstehende Ende der rippenförmigen Abschnitte im Schnitt halbkreisförmig ausgebildet, wobei die Anschlussbohrung durch den am weitesten vorstehenden Bereich des rippenförmigen Abschnitts geführt ist.In order to obtain particularly favorable tension conditions, ie very low tensions, at the intersection of the bores between the longitudinal recess and the connection bores, the rib-shaped sections are preferably rounded. The protruding end is particularly preferred of the rib-shaped sections in the form of a semi-circle in section, the connection bore being guided through the most protruding region of the rib-shaped section.
Nachfolgend wird die Erfindung anhand von bevorzugten Ausführungsbeispielen in Verbindung mit der Zeichnung beschrieben. In der Zeichnung ist:The invention is described below on the basis of preferred exemplary embodiments in conjunction with the drawing. In the drawing is:
Figur 1 eine schematische Schnittansicht eines Kraftstoffhochdruckspeichers gemäß einem ersten Ausführungs- beispiel der vorliegenden Erfindung;FIG. 1 shows a schematic sectional view of a high-pressure fuel accumulator according to a first exemplary embodiment of the present invention;
Figur 2 eine schematische Schnittansicht eines Kraftstoff- hochdruckspeichers gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung;FIG. 2 shows a schematic sectional view of a high-pressure fuel accumulator according to a second exemplary embodiment of the present invention;
Figur 3 eine schematische Längsschnittansicht eines Kraftstoffhochdruckspeichers gemäß dem Stand der Technik undFigure 3 is a schematic longitudinal sectional view of a high-pressure fuel accumulator according to the prior art and
Figur 4 eine Schnittansicht entlang der Linie A-A desFigure 4 is a sectional view taken along line A-A of the
Kraftstoffhochdruckspeichers gemäß dem Stand der Technik von Figur 3.High-pressure fuel accumulator according to the prior art of FIG. 3.
Nachfolgend wird unter Bezugnahme auf Figur 1 ein erstes Aus- führungsbeispiel gemäß der vorliegenden Erfindung beschrieben.A first exemplary embodiment according to the present invention is described below with reference to FIG. 1.
Wie in Figur 1 gezeigt, besteht der Kraftstoffhochdruck- speicher aus einem Grundkörper 1, welcher länglich ausgebildet ist und von dem mehrere Anschlussbohrungen 2 abgehen, welche zu Injektoren an einzelnen Zylindern einer Brennkraft- maschine führen. Der Grundkörper 1 ist dabei mit einer inneren Längsbohrung 3 ausgebildet, welche im Wesentlichen zylin- derförmig ausgebildet ist. Am Innenumfang der Längsbohrung 3 ist dabei ein rippenförmiger Abschnitt 4 gebildet, welcher über die gesamte Länge des Grundkörpers 1 verläuft. Der Radius R der im Wesentlichen zylinderförmigen Bohrung ist dabei derart gewählt, dass das notwendige Speichervolumen trotz der Volumenreduktion durch den nach innen gerichteten rippenförmigen Abschnitt 4 bereitgestellt wird.As shown in FIG. 1, the high-pressure fuel accumulator consists of a base body 1, which is elongated and from which a plurality of connection bores 2 extend, which form injectors on individual cylinders of an internal combustion engine. machine. The base body 1 is formed with an inner longitudinal bore 3, which is essentially cylindrical. A rib-shaped section 4 is formed on the inner circumference of the longitudinal bore 3 and extends over the entire length of the base body 1. The radius R of the essentially cylindrical bore is selected such that the necessary storage volume is provided by the inwardly directed rib-shaped section 4 despite the volume reduction.
Wie aus Figur 1 ersichtlich ist, ist die Anschlussbohrung 2 dabei derart am Grundkörper 1 angeordnet, dass die Anschlussbohrung 2 durch den rippenförmigen Abschnitt 4 geführt ist und die Bohrungsverschneidung zwischen der Längsbohrung 3 und der Anschlussbohrung 2 am Ende des rippenförmigen Abschnitts 4 angeordnet ist. Der rippenförmige Abschnitt 4 ist dabei derart gebildet, dass sein Ende im Schnitt einen Halbkreis beschreibt, so dass sich am Schnittpunkt, d.h. Übergangsbereich, zwischen der Bohrung 2 und dem rippenförmigen Ab- schnitt 4 ein spitzer Winkel α ergibt.As can be seen from FIG. 1, the connection bore 2 is arranged on the base body 1 in such a way that the connection bore 2 is guided through the rib-shaped section 4 and the intersection of the holes between the longitudinal bore 3 and the connection bore 2 is arranged at the end of the rib-shaped section 4. The rib-shaped section 4 is formed such that its end describes a semicircle in section, so that at the intersection, i.e. Transition area between the bore 2 and the rib-shaped section 4 results in an acute angle α.
Durch die Anordnung der Anschlussbohrung 2 am rippenförmigen Abschnitt 4 wird eine günstige Spannungsverteilung erreicht, da der im Grundkörper 1 herrschende Druck von beiden Seiten auf den rippenförmigen Abschnitt 4 wirkt, so dass die resultierenden Kräfte an der Bohrungsverschneidung deutlich reduziert sind. Bedeutsam ist ebenfalls, dass der Einfluss der Tangentialspannung bzw. UmfangsSpannung der Längsbohrungen an der Verschneidung geringer ist. Dadurch wird die Gefahr einer Rissbildung am Übergangsbereich zwischen der Anschlussbohrung 2 und der Längsbohrung 3 deutlich reduziert. Somit kann der erfindungsgemäße Hochdruckspeicher insbesondere für die in naher Zukunft zu erwartenden höheren Drücke bei Kraftstoff- einspritzsystemen eingesetzt werden bzw. es können kostengünstigere Materialien mit geringerer Hochdruckfestigkeit für die Kraftstoffhochdruckspeicher verwendet werden.The arrangement of the connection bore 2 on the rib-shaped section 4 results in a favorable stress distribution, since the pressure prevailing in the base body 1 acts on the rib-shaped section 4 from both sides, so that the resulting forces at the intersection of the holes are significantly reduced. It is also important that the influence of the tangential tension or circumferential tension of the longitudinal bores on the intersection is less. This significantly reduces the risk of cracks forming at the transition area between the connection bore 2 and the longitudinal bore 3. The high-pressure accumulator according to the invention can thus be used in particular for the higher pressures to be expected in the near future in the injection systems are used or more cost-effective materials with lower high pressure resistance can be used for the high-pressure fuel storage.
Nachfolgend wird unter Bezugnahme auf Figur 2 ein Kraftstoffhochdruckspeicher gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung beschrieben. Gleiche bzw. funktional gleiche Teile sind dabei mit den gleichen Bezugszeichen wie im ersten Ausführungsbeispiel bezeichnet.A high-pressure fuel accumulator according to a second exemplary embodiment of the present invention is described below with reference to FIG. The same or functionally the same parts are designated with the same reference numerals as in the first embodiment.
L OL O
Wie in Figur 2 gezeigt, umfasst der Kraftstoffhochdruckspeicher gemäß dem zweiten Ausführungsbeispiel ebenfalls einen länglichen Grundkörper 1, in welchem eine durchgehende Langsausnehmung 3 ausgebildet ist.As shown in FIG. 2, the high-pressure fuel accumulator according to the second exemplary embodiment likewise comprises an elongate base body 1, in which a continuous longitudinal recess 3 is formed.
1515
Im Gegensatz zum ersten Ausführungsbeispiel sind im zweiten Ausführungsbeispiel drei rippenförmige Abschnitte 4, 5, 6 am Innenumfang der Langsausnehmung 3 gebildet. Wie in Figur 2 gezeigt, sind die drei rippenförmigen Abschnitte 4, 5, 6 da- 0 bei um jeweils 120° um den Innenumfang der im Wesentlichen zylinderförmigen Langsausnehmung 3 angeordnet. Die rippenförmigen Abschnitte 4, 5, 6 stehen in die L ngsausnehmung 3 vor und sind an ihrem Ende abgerundet gebildet.In contrast to the first exemplary embodiment, three rib-shaped sections 4, 5, 6 are formed on the inner circumference of the longitudinal recess 3 in the second exemplary embodiment. As shown in FIG. 2, the three rib-shaped sections 4, 5, 6 are arranged at 120 ° each around the inner circumference of the essentially cylindrical longitudinal recess 3. The rib-shaped sections 4, 5, 6 protrude into the longitudinal recess 3 and are rounded at their end.
5 Wie in Figur 2 gezeigt, ist eine erste Anschlussbohrung 2 derart angeordnet, dass die Bohrungsverschneidung mit der Langsausnehmung 3 am ersten rippenförmigen Abschnitt 4 angeordnet ist. Eine zweite Anschlussbohrung 7 ist weiterhin durch den zweiten rippenförmigen Abschnitt 5 geführt (vgl. 0 Figur 2) . Durch die Anordnung mehrerer rippenförmiger Abschnitte 4, 5, 6 ist es somit möglich, dass die Anschlussbohrungen in Längsrichtung des Grundkörpers 1 auf der gleichen Höhe an unterschiedlichen Positionen am Umfang des Grundkörpers 1 angeordnet werden können. In dem in Figur 2 dargestellten Hochdruckspeicher sind dabei an dem dargestellten Schnitt zwei Anschlussbohrungen 2 und 7 auf gleicher Höhe in Längsrichtung an unterschiedlichen Umfangspositionen5 As shown in FIG. 2, a first connection bore 2 is arranged such that the intersection of the bores with the longitudinal recess 3 is arranged on the first rib-shaped section 4. A second connection bore 7 is also passed through the second rib-shaped section 5 (cf. FIG. 2). The arrangement of a plurality of rib-shaped sections 4, 5, 6 thus makes it possible for the connection bores in the longitudinal direction of the base body 1 to be at the same height at different positions on the circumference of the Base body 1 can be arranged. In the high-pressure accumulator shown in FIG. 2, there are two connection bores 2 and 7 at the same height in the longitudinal direction at different circumferential positions on the section shown
5 der Grundkörpers 1 angeordnet. Dies ermöglicht höhere Freiheitsgrade hinsichtlich der Anordnung der Anschlussbohrungen für die Injektoren bzw. sonstigen Zuleitungen/Ableitungen. Weiterhin ist es dadurch möglich, dass die Gesamtlänge des Grundkörpers 1 im Vergleich mit dem Stand der Technik redu-5 of the base body 1 is arranged. This enables higher degrees of freedom with regard to the arrangement of the connection bores for the injectors or other supply lines / discharge lines. Furthermore, it is thereby possible for the total length of the base body 1 to be reduced in comparison with the prior art.
.0 ziert werden kann, da mehrere Bohrungen auf gleicher Höhe am Umfang des Grundkörpers 1 verteilt werden können. Der Radius R ist dabei derart gewählt, dass das notwendige Speichervolumen vorhanden ist..0 can be decorated, since several holes can be distributed at the same height on the circumference of the base body 1. The radius R is chosen such that the necessary storage volume is available.
L5 Weiterhin ergibt sich durch die Anordnung von drei gleichmäßig zueinander versetzten rippenförmigen Abschnitten eine besonders hohe Stabilität des erfindungsgemäßen Hochdruckspeichers .L5 Furthermore, the arrangement of three rib-shaped sections which are offset uniformly from one another results in a particularly high stability of the high-pressure accumulator according to the invention.
20 Durch die Anordnung von mehreren gleichmäßig zueinander versetzten rippenförmige Abschnitten 4 am Innenumfang des Grundkörpers, bei die somit im gleichen Winkelabstand zueinander an der Innenfläche der Langsausnehmung angeordnet sind, ergibt sich eine hohe Stabilität und eine gute Ziehbarkeit des 5 Kraftstoffrohres.20 The arrangement of several evenly offset rib-shaped sections 4 on the inner circumference of the base body, which are thus arranged at the same angular distance from one another on the inner surface of the longitudinal recess, results in high stability and good ductility of the fuel pipe.
Die benötigten radialen Anschlussbohrungen 2,7 können dabei nach Bedarf in einer oder mehreren zueinander versetzten rippenförmigen Abschnitten 4 eingebracht sein, so dass radiale 0 Anschlussbohrungen 2, 7 in einem Winkelabstand WA von Vielfachen k von (360°/n) (n=Anzahl der rippenförmigen Abschnitte) eingebracht sein können: WA=k* 360 ° /nThe required radial connecting bores 2, 7 can be made as required in one or more rib-shaped sections 4 offset from one another, so that radial 0 connecting bores 2, 7 are at an angular distance WA of multiples k of (360 ° / n) (n = number of rib-shaped sections) can be introduced: WA = k * 360 ° / n
Bevorzugt ragt der rippenförmige Abschnitt 4,5 im Vergleich zur im zylindrisch gedachten Innenfläche der Langsausnehmung um einen Abstand D von mehr als 2mm nach innen, wodurch eine hohe Stabilität und geringe Eigenspannungen bei Hochdruck von 1000 bis 2500 bar im Kraftstoffverteiler erzielt wird, bei einem Innendurchmesser der Innenfläche von 7 bis 15mm.Preferably, the rib-shaped section 4, 5 protrudes inwards in comparison to the cylindrical inner surface of the longitudinal recess by a distance D of more than 2 mm, as a result of which high stability and low internal stresses at high pressure of 1000 to 2500 bar are achieved in the fuel distributor, with an inner diameter the inner surface from 7 to 15mm.
Ansonsten entspricht das zweite Ausführungsbeispiel dem ersten Ausführungsbeispiel, so dass auf die dort gegebene Beschreibung verwiesen werden kann.Otherwise, the second exemplary embodiment corresponds to the first exemplary embodiment, so that reference can be made to the description given there.
Somit betrifft die vorliegende Erfindung einen Kraftstoff- hochdruckspeicher für ein Speichereinspritzsystem von Brennkraftmaschinen mit einem Grundkörper 1, umfassend eine Langsausnehmung 3, von welcher mehrere Anschlussbohrungen 2, 7 abgehen. Dabei ist die Innenfläche der Langsausnehmung 3 im Wesentlichen zylinderförmig ausgebildet, wobei am Innenumfang der Langsausnehmung 3 wenigstens ein rippenförmiger Abschnitt 4 gebildet ist, in welchen eine Anschlussbohrung 2 in die Langsausnehmung 3 mündet.The present invention thus relates to a high-pressure fuel accumulator for an accumulator injection system of internal combustion engines with a base body 1, comprising a longitudinal recess 3, from which a plurality of connection bores 2, 7 extend. The inner surface of the longitudinal recess 3 is essentially cylindrical, at least one rib-shaped section 4 being formed on the inner circumference of the longitudinal recess 3, in which a connection bore 2 opens into the longitudinal recess 3.
Die vorliegende Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. Es können verschiedene Abweichungen und Änderungen ausgeführt werden, ohne den Erfin- dungsumfang zu verlassen. The present invention is not limited to the exemplary embodiments shown. Various deviations and changes can be carried out without leaving the scope of the invention.

Claims

Patentansprüche claims
1. Kraftstoffhochdruckspeicher für ein Speichereinspritzsystem von Brennkraftmaschinen mit einem Grundkörper (1) mit einer Langsausnehmung (3) , von welcher mehrere An- schlussbohrungen (2) abgehen, dadurch gekennzei chnet , dass die Innenfläche der Langsausnehmung (3) im Wesentlichen zylinderförmig ausgebildet ist, wo- . bei am Innenumfang wenigstens ein rippenförmiger Ab- schnitt (4) gebildet ist, in welchen die An- schlussbohrungen (2) in die Langsausnehmung (3) münden.1. High-pressure fuel accumulator for an accumulator injection system of internal combustion engines with a base body (1) with a longitudinal recess (3), from which a plurality of connection bores (2) extend, characterized in that the inner surface of the longitudinal recess (3) is essentially cylindrical. Where- . at least one rib-shaped section (4) is formed on the inner circumference, in which the connection bores (2) open into the longitudinal recess (3).
2. Kraftstoffhochdruckspeicher nach Anspruch 1, dadurch gekennzeichnet, dass der rippenför- ige Abschnitt (4) über die gesamte Länge des Grundkörpers (1) verläuft.2. High-pressure fuel accumulator according to claim 1, characterized in that the rib-shaped section (4) extends over the entire length of the base body (1).
3. Kraftstoffhochdruckspeicher nach Anspruch 1 oder 2, dadurch ge kennzeichnet , dass mehrere rippenförmige Abschnitte (4, 5, 6) am Innenumfang des Grundkörpers (1) gebildet sind.3. High-pressure fuel accumulator according to claim 1 or 2, characterized in that a plurality of rib-shaped sections (4, 5, 6) are formed on the inner circumference of the base body (1).
4. Kraftstoffhochdruckspeicher nach Anspruch 3, dadurch gekennzeichnet , dass zwei rippenför- mige Abschnitte am Innenumfang des Grundkörpers (1) gebildet sind, welche entgegengesetzt zueinander angeordnet sind.4. High-pressure fuel accumulator according to claim 3, characterized in that two rib-shaped sections are formed on the inner circumference of the base body (1), which are arranged opposite to each other.
5. Kraftstoffhochdruckspeicher nach Anspruch 3, d a - durch gekennzei chnet , dass drei rippenförmige Abschnitte (4, 5, 6) am Innenumfang des Grundkörpers (1) gebildet sind, welche zueinander um jeweils 120° versetzt angeordnet sind. 5. High-pressure fuel accumulator according to claim 3, because - by gekennzei chnet that three rib-shaped sections (4, 5, 6) are formed on the inner circumference of the base body (1), which are mutually offset by 120 °.
6. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennz eichnet , dass am Übergang zwischen der Anschluss- bohrung (2) und dem rippenförmigen Abschnitt (4) ein spitzer Winkel (α) gebildet ist.6. High-pressure fuel accumulator according to one of the preceding claims, characterized in that an acute angle (α) is formed at the transition between the connection bore (2) and the rib-shaped section (4).
7. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet , dass der Endbereich der rippenförmigen Abschnitte (4, 5, 6) abgerundet ausgebildet ist.7. High-pressure fuel accumulator according to one of the preceding claims, characterized in that the end region of the rib-shaped sections (4, 5, 6) is rounded.
8. Kraftstoffhochdruckspeicher nach Anspruch 7, dadurch gekennz eichnet , dass der Endbereich der rippenförmigen Abschnitte (4, 5, 6) im Schnitt halbkreisförmig ausgebildet ist.8. High-pressure fuel accumulator according to claim 7, characterized in that the end region of the rib-shaped sections (4, 5, 6) is semicircular in section.
9. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennz ei chnet, dass der Kraftstoffhochdruckspeicher aus einem gezogenen Rohr hergestellt ist.9. High-pressure fuel reservoir according to one of the preceding claims, characterized in that the high-pressure fuel reservoir is made from a drawn tube.
10. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der rippen- förmige Abschnitt im Vergleich zur im zylindrisch gedachten Innenfläche der Langsausnehmung (3) um einen Abstand (D) von mehr als 2mm nach innen ragt.10. High-pressure fuel accumulator according to one of the preceding claims, characterized in that the rib-shaped section protrudes inwards by a distance (D) of more than 2 mm in comparison to the cylindrical inner surface of the longitudinal recess (3).
11. Kraftstoffhochdruckspeicher nach Anspruch 3, d a - durch gekennzeichnet, dass mehrere rippenförmige Abschnitte (4, 5, 6) am Innenumfang des Grundkörpers (1) gebildet sind, welche im gleichen Winkelabstand zueinander an der Innenfläche der Langsausnehmung angeordnet sind.11. High-pressure fuel accumulator according to claim 3, characterized in that a plurality of rib-shaped sections (4, 5, 6) are formed on the inner circumference of the base body (1), which are at the same angular distance from one another on the inner surface of the longitudinal recess are arranged.
12. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennze ichnet , dass der Kraftstoffhochdruckspeicher mindestens zwei radiale Anschlußohrungen (4,5) aufweist, die in einem Winkelabstand (WA in Grad °) aufweisen, der ein von Vielfaches (k) von 360° dividiert durch die Anzahl (n) der rippenförmigen Abschnitte (4,5) ist. 12. High-pressure fuel accumulator according to one of the preceding claims, characterized in that the high-pressure fuel accumulator has at least two radial connecting bores (4, 5) which have an angular distance (WA in degrees °) that divides by a multiple (k) of 360 ° by the number (n) of the rib-shaped sections (4,5).
EP02774308A 2001-09-05 2002-09-04 High pressure fuel accumulator for an accumulator injection system Expired - Fee Related EP1423601B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10143519A DE10143519A1 (en) 2001-09-05 2001-09-05 High pressure fuel reservoir, for e.g. common rail fuel injection system, has main body with lengthy recess and internal ridge penetrated by bores
DE10143519 2001-09-05
PCT/DE2002/003273 WO2003023220A1 (en) 2001-09-05 2002-09-04 High pressure fuel accumulator for an accumulator injection system

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EP1423601A1 true EP1423601A1 (en) 2004-06-02
EP1423601B1 EP1423601B1 (en) 2007-03-21

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US (1) US6923160B2 (en)
EP (1) EP1423601B1 (en)
JP (1) JP2005502000A (en)
DE (2) DE10143519A1 (en)
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EP2299102A1 (en) 2009-09-07 2011-03-23 OMT Officine Meccaniche Torino S.p.A. High-pressure fuel accumulator for common-rail injection systems
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DE10143519A1 (en) 2003-03-27
HUP0401247A2 (en) 2004-10-28
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DE50209792D1 (en) 2007-05-03
US6923160B2 (en) 2005-08-02
JP2005502000A (en) 2005-01-20
US20040168675A1 (en) 2004-09-02

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