EP1117925A1 - High pressure fuel accumulator - Google Patents

High pressure fuel accumulator

Info

Publication number
EP1117925A1
EP1117925A1 EP00962180A EP00962180A EP1117925A1 EP 1117925 A1 EP1117925 A1 EP 1117925A1 EP 00962180 A EP00962180 A EP 00962180A EP 00962180 A EP00962180 A EP 00962180A EP 1117925 A1 EP1117925 A1 EP 1117925A1
Authority
EP
European Patent Office
Prior art keywords
pressure fuel
intermediate piece
fuel
accumulator
pressure
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
EP00962180A
Other languages
German (de)
French (fr)
Other versions
EP1117925B1 (en
Inventor
Kurt Frank
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.)
Robert Bosch GmbH
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 EP1117925A1 publication Critical patent/EP1117925A1/en
Application granted granted Critical
Publication of EP1117925B1 publication Critical patent/EP1117925B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • the invention relates to a high-pressure fuel reservoir for a Co mon-rail fuel injection system of an internal combustion engine, with a plurality of connectors for fuel lines.
  • a high-pressure pump conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as the common rail.
  • Fuel lines lead from the rail to the individual 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 pressure generation and the injection are decoupled from one another by the high-pressure fuel reservoir.
  • a conventional high-pressure fuel accumulator is described, for example, in DE 195 48 611.
  • the known high-pressure fuel accumulator consists of an elongated, tubular body with several Connections to supply the injectors. The ends of the
  • Fuel lines are in the fittings of the
  • High-pressure fuel accumulator only has limited mobility.
  • the object of the invention is a
  • Connection points can be guaranteed even at high pressures.
  • High-pressure fuel storage can be constructed simply and inexpensively manufactured.
  • the object is achieved in a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a plurality of connecting pieces for fuel lines, in that an intermediate piece is arranged in each case in the connecting pieces between the high-pressure fuel storage device and the fuel lines.
  • the mobility of the fuel lines in the connection piece is considerably improved by the intermediate piece. Due to the better mobility, tolerances caused by production and assembly can be compensated.
  • a special embodiment of the invention is characterized in that the intermediate piece has essentially the shape of a hollow cylinder with two conical end faces which cooperate with complementary end faces on the fuel line and the high-pressure fuel accumulator. Due to the conical faces, a good sealing effect achieved when the complementary end faces are braced against each other.
  • a further special embodiment of the invention is characterized in that an external thread is provided on the connecting piece, which cooperates with the internal thread of a retaining nut such that the free end of the fuel line is braced against the intermediate piece and the intermediate piece against the high-pressure fuel accumulator.
  • the holding nut enables the fuel lines to be mounted quickly on the high-pressure fuel accumulator.
  • a further particular embodiment of the invention is characterized in that the end of the intermediate piece facing the high-pressure fuel reservoir and the end facing away from the high-pressure fuel reservoir taper, and that a radial support surface for the fuel line is formed on the retaining nut.
  • the symmetrical shape of the intermediate piece simplifies its assembly, because the fitter does not have to pay attention to how the intermediate piece is inserted into the connecting piece.
  • a further special embodiment of the invention is characterized in that the end of the intermediate piece facing the high-pressure fuel reservoir tapers, that the end of the intermediate piece facing away from the high-pressure fuel reservoir is funnel-shaped, and that the intermediate piece is at least part of its outer lateral surface on the inner one Supports the peripheral surface of the connector. If the intermediate piece has an asymmetrical shape, it could be widened on the end face facing the fuel line by the complementary end face of the fuel line become. Such a widening is prevented by the intermediate piece being supported on the inner circumferential surface of the connecting piece with at least part of its outer lateral surface.
  • Another special embodiment of the invention is characterized in that the connecting pieces are welded to the high-pressure fuel accumulator.
  • This embodiment provides the advantage that the seal to the environment is made directly on the high-pressure fuel accumulator.
  • the interface between the connector. and the high-pressure fuel accumulator need not be designed to be high-pressure-tight. This saves production costs.
  • a section of a high-pressure fuel accumulator according to the invention is shown in longitudinal section.
  • the high-pressure fuel reservoir shown is formed by a tubular base body 1 with an elongated, circular-cylindrical interior 6.
  • the interior 6 of the tubular base body 1 is connected via a cross connection 7, a connector 2 and a high-pressure fuel line 10 to an injector (not shown) of an internal combustion engine.
  • connection point is provided on the tubular base body 1 for each injector.
  • further connection points for the fuel supply, pressure sensors, etc. are provided on the tubular base body 1.
  • the connector 2 has the shape of a stepped circular hollow cylinder with two sections that have different diameters.
  • the external thread is formed on the section with the smaller diameter.
  • the end face of the section with the larger diameter is firmly connected to the tubular base body 1 with the aid of a welded connection 3.
  • an elevation 4 in the form of a round disk is formed concentrically on the tubular base body 1. In the center of the elevation 4 there is a funnel-shaped opening 5 which opens into the cross connection 7.
  • the intermediate piece 9 has the shape of a hollow cylinder and is clamped between the fuel line 10 and the tubular base body 1 with the aid of a retaining nut 11.
  • the internal thread of the retaining nut 11 interacts with the external thread of the connector 2.
  • the fuel line 10 extends through a circular recess 18, which is provided centrally in the holding nut 11.
  • connection piece 2 In the connection piece 2, the intermediate piece 9, the intermediate piece 9 the connection piece
  • the intermediate piece 9 tapers on its tubular base body
  • the tapered end 12 of the intermediate piece 9 interacts with a complementary sealing cone 13 on the fuel line 10.
  • the holding nut is on the holding nut
  • a support surface 14 is formed, which abuts a collar 17 which is formed at the end of the fuel line 10.
  • annular clamping surface 15 is formed on the end face of the holding nut 11.
  • the sealing cone 13 formed on the fuel line 10 is pressed against the tapered end 12 of the intermediate piece 9 via the clamping surface 15.
  • the tapered end 8 of the intermediate piece 9 is pressed into the funnel-shaped opening 5 of the tubular base body 1.
  • a dash 16 indicates that the fuel line 10 can be deflected by an angle of approximately 10 ° in the assembled state.
  • the tensioning of the intermediate piece 9 between the fuel line 10 and the tubular base body 1 is achieved by a clamping surface 25 which is formed on the retaining nut 11.
  • a dash 26 indicates that sufficient deflection of the fuel line 10 in the installed state is also possible in this embodiment.
  • the mobility of the fuel line 10 is ensured by the small distance between the sealing cone 13, 23 at the end of the fuel line 10 and the clamping surface 15, 25.
  • the size of the recess 18 must be sufficiently large.

Landscapes

  • 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 a common rail fuel injection system of an internal combustion engine, with a plurality of connectors (2) for fuel ducts (10). The aim of the invention is to improve the mobility of the ends of the fuel ducts in the connectors. To this end, respective intermediate elements (9) are located in the connectors (2) between the high pressure fuel accumulator (1) and the fuel ducts (10).

Description

KraftStoffhochdruckspeicherHigh-pressure fuel storage
Stand der TechnikState of the art
Die Erfindung betrifft einen Kraftstoffhochdruckspeicher für ein Co mon-Rail-Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit mehreren Anschlussstücken für Kraftstoffleitungen.The invention relates to a high-pressure fuel reservoir for a Co mon-rail fuel injection system of an internal combustion engine, with a plurality of connectors for fuel lines.
In Common-Rail-Einspritzsystemen fördert eine Hochddruckpumpe, eventuell unter Zuhilfenahme einer Vorförderpu pe , den einzuspritzenden Kraftstoff aus einem Tank in den zentralen Kraftstoffhochdruckspeicher, der als Common-Rail bezeichnet wird. Von dem Rail führen Kraftstoffleitungen zu den einzelnen Injektoren, die den Zylindern der Brennkraftmaschine zugeordnet sind. Die Injektoren werden in Abhängigkeit von denIn common-rail injection systems, a high-pressure pump, possibly with the aid of a pre-feed pump, conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as the common rail. Fuel lines lead from the rail to the individual injectors, which are assigned to the cylinders of the internal combustion engine. The injectors are dependent on the
Betriebsparametern der Brennkraftmaschine einzeln von der Motorelektronik angesteuert, um Kraftstoff in den Brennraum der Brennkraftmaschine einzuspritzen. Durch den Kraftstoffhochdruckspeicher sind die Druckerzeugung und die Einspritzung voneinander entkoppelt.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 pressure generation and the injection are decoupled from one another by the high-pressure fuel reservoir.
Ein herkömmlicher Kraftstoff ochdruckspeicher ist z.B. in der DE 195 48 611 beschrieben. Der bekannte Kraftstoffhochdruckspeicher besteht aus einem langgestreckten, rohrförmigen Körper mit mehreren Anschlüssen zur Versorgung der Injektoren. Die Enden derA conventional high-pressure fuel accumulator is described, for example, in DE 195 48 611. The known high-pressure fuel accumulator consists of an elongated, tubular body with several Connections to supply the injectors. The ends of the
Kraftstoffleitungen sind in den Anschlussstücken desFuel lines are in the fittings of the
Kraftstoffhochdruckspeichers nur eingeschränkt beweglich.High-pressure fuel accumulator only has limited mobility.
Bei der Montage des Kraftstoffhochdruckspeichers an derWhen installing the high-pressure fuel accumulator on the
Brennkraftmaschine hat sich die mangelnde Beweglichkeit derInternal combustion engine has the lack of mobility
Kraftstoffleitungen in den Anschlussstücken desFuel lines in the connectors of the
Kraftstoffhochdruckspeichers als nachteilig erwiesen.High-pressure fuel storage proved to be disadvantageous.
Aufgabe der Erfindung ist es, einenThe object of the invention is a
Kraftstoffhochdruckspeicher der eingangs geschilderten Art so auszubilden, dass die Enden der Kraftstoffleitungen in den Anschlussstücken ausreichend beweglich sind. Trotz der ausreichenden Beweglichkeit soll die Dichtigkeit an denTo design high-pressure fuel accumulators of the type described in the introduction in such a way that the ends of the fuel lines are sufficiently movable in the connecting pieces. Despite the sufficient mobility, the tightness of the
Anschlussstellen auch bei hohen Drücken gewährleistet sein.Connection points can be guaranteed even at high pressures.
Darüber hinaus soll der erfindungsgemäßeIn addition, the invention
Kraftstoffhochdruckspeicher einfach aufgebaut und kostengünstig herstellbar sein.High-pressure fuel storage can be constructed simply and inexpensively manufactured.
Die Aufgabe ist bei einem Kraftstoffhochdruckspeicher für ein Common-Rail-Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit mehreren Anschlussstücken für Kraftstoffleitungen, dadurch gelöst, dass in den Anschlussstücken zwischen dem Kraftstoffhochdruckspeicher und den Kraftstoffleitungen jeweils ein Zwischenstück angeordnet ist. Durch das Zwischenstück wird die Beweglichkeit der Kraftstoffleitungen in dem Anschlussstück erheblich verbessert. Durch die bessere Beweglichkeit können fertigungs- und montagebedingte Toleranzen ausgeglichen werden.The object is achieved in a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a plurality of connecting pieces for fuel lines, in that an intermediate piece is arranged in each case in the connecting pieces between the high-pressure fuel storage device and the fuel lines. The mobility of the fuel lines in the connection piece is considerably improved by the intermediate piece. Due to the better mobility, tolerances caused by production and assembly can be compensated.
Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass das Zwischenstück im Wesentlichen die Form eines Hohlzylinders mit zwei konischen Stirnflächen aufweist, die mit komplementären Stirnflächen an der Kraftstoffleitung und dem Kraftstoffhochdruckspeicher zusammenwirken. Durch die konischen Stirnflächen wird eine gute Dichtwirkung erzielt, wenn die komplementären Stirnflächen gegeneinander verspannt werden.A special embodiment of the invention is characterized in that the intermediate piece has essentially the shape of a hollow cylinder with two conical end faces which cooperate with complementary end faces on the fuel line and the high-pressure fuel accumulator. Due to the conical faces, a good sealing effect achieved when the complementary end faces are braced against each other.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass an dem Anschlussstück ein Außengewinde vorgesehen ist, das mit dem Innengewinde einer Haltemutter so zusammenwirkt, dass die Kraftstoffleitung mit ihrem freien Ende gegen das Zwischenstück, und das Zwischenstück gegen den Kraftstoffhochdruckspeicher verspannt wird. Durch die Haltemutter wird eine schnelle Montage der Kraftstoffleitungen an dem Kraftstoffhochdruckspeicher ermöglicht .A further special embodiment of the invention is characterized in that an external thread is provided on the connecting piece, which cooperates with the internal thread of a retaining nut such that the free end of the fuel line is braced against the intermediate piece and the intermediate piece against the high-pressure fuel accumulator. The holding nut enables the fuel lines to be mounted quickly on the high-pressure fuel accumulator.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass sich das zu dem Kraftstoffhochdruckspeicher gewandte und das von dem Kraftstoffhochdruckspeicher abgewandte Ende des Zwischenstücks verjüngen, und dass an der Haltemutter eine radiale Abstützflache für die Kraftstoffleitung ausgebildet ist. Durch die symmetrische Gestalt des Zwischenstücks wird dessen Montage vereinfacht, weil der Monteur nicht darauf achten muss, wie herum das Zwischenstück in das Anschlussstück eingesetzt wird.A further particular embodiment of the invention is characterized in that the end of the intermediate piece facing the high-pressure fuel reservoir and the end facing away from the high-pressure fuel reservoir taper, and that a radial support surface for the fuel line is formed on the retaining nut. The symmetrical shape of the intermediate piece simplifies its assembly, because the fitter does not have to pay attention to how the intermediate piece is inserted into the connecting piece.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass sich das zu dem Kraftstoffhochdruckspeicher gewandte Ende des Zwischenstücks verjüngt, dass das von dem Kraftstoffhochdruckspeicher abgewandte Ende des Zwischenstücks trichterförmig ausgebildet ist, und dass sich das Zwischenstück zumindest mit einem Teil seiner äußeren Mantelfläche an der inneren Umfangsflache des Anschlussstücks abstützt. Wenn das Zwischenstück eine asymmetrische Gestalt aufweist, könnte es an der zu der Kraftstoffleitung gewandten Stirnfläche durch die komplementäre Stirnfläche der Kraftstoffleitung aufgeweitet werden. Eine solche Aufweitung wird dadurch verhindert, dass sich das Zwischenstück zumindest mit einem Teil seiner äußeren Mantelfläche an der inneren Umfangsflache des Anschlussstücks abstützt.A further special embodiment of the invention is characterized in that the end of the intermediate piece facing the high-pressure fuel reservoir tapers, that the end of the intermediate piece facing away from the high-pressure fuel reservoir is funnel-shaped, and that the intermediate piece is at least part of its outer lateral surface on the inner one Supports the peripheral surface of the connector. If the intermediate piece has an asymmetrical shape, it could be widened on the end face facing the fuel line by the complementary end face of the fuel line become. Such a widening is prevented by the intermediate piece being supported on the inner circumferential surface of the connecting piece with at least part of its outer lateral surface.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass die Anschlussstücke an den Kraftstoffhochdruckspeicher angeschweißt sind. Diese Ausführungsart liefert den Vorteil, dass die Abdichtung zur Umgebung direkt an dem Kraftstoffhochdruckspeicher erfolgt. Die Schnittstelle zwischen dem Anschlussstück. und dem Kraftstoffhochdruckspeicher muss nicht hochdruckdicht ausgelegt werden. Dadurch werden Kosten bei der Herstellung eingespart .Another special embodiment of the invention is characterized in that the connecting pieces are welded to the high-pressure fuel accumulator. This embodiment provides the advantage that the seal to the environment is made directly on the high-pressure fuel accumulator. The interface between the connector. and the high-pressure fuel accumulator need not be designed to be high-pressure-tight. This saves production costs.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung zweiFurther advantages, features and details of the invention emerge from the following description, in which two with reference to the drawing
Ausführungsbeispiele der Erfindung im Einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.Embodiments of the invention are described in detail. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination.
In der beiliegenden Figur ist ein Ausschnitt eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Längsschnitt dargestellt. Der dargestellte Kraftstoffhochdruckspeicher wird von einem rohrförmigen Grundkörper 1 mit einem langgestreckten, kreiszylinderförmigen Innenraum 6 gebildet. Der Innenraum 6 des rohrförmigen Grundkörpers 1 steht über eine Querverbindung 7, ein Anschlussstück 2 und eine Kraftstoffhochdruckleitung 10 mit einem (nicht dargestellten) Injektor einer Brennkraftmaschine in Verbindung.In the accompanying figure, a section of a high-pressure fuel accumulator according to the invention is shown in longitudinal section. The high-pressure fuel reservoir shown is formed by a tubular base body 1 with an elongated, circular-cylindrical interior 6. The interior 6 of the tubular base body 1 is connected via a cross connection 7, a connector 2 and a high-pressure fuel line 10 to an injector (not shown) of an internal combustion engine.
Aus Gründen der Übersichtlichkeit ist in der dargestellten Figur nur eine Anschlussstelle dargestellt. Selbstverständlich ist an dem rohrförmigen Grundkörper 1 für jeden Injektor eine Anschlussstelle vergesehen. Darüber hinaus sind noch weitere Anschlussstellen für die Kraftstoffzufuhr , Drucksensoren usw. an dem rohrförmigen Grundkörper 1 vorgesehen.For the sake of clarity is shown in the Figure shows only one junction. Of course, a connection point is provided on the tubular base body 1 for each injector. In addition, further connection points for the fuel supply, pressure sensors, etc. are provided on the tubular base body 1.
Das Anschlussstück 2 hat die Form eines gestuften Kreishohlzylinders mit zwei Abschnitten, die unterschiedliche Durchmesser aufweisen. An dem Abschnitt mit dem kleineren Durchmesser ist das Außengewinde ausgebildet. Die Stirnfläche des Abschnitts mit dem größeren Durchmesser ist mit Hilfe einer Schweißverbindung 3 fest mit dem rohrförmigen Grundkörper 1 verbunden.The connector 2 has the shape of a stepped circular hollow cylinder with two sections that have different diameters. The external thread is formed on the section with the smaller diameter. The end face of the section with the larger diameter is firmly connected to the tubular base body 1 with the aid of a welded connection 3.
Innerhalb des Anschlussstücks 2 ist an dem rohrförmigen Grundkörper 1 konzentrisch eine Erhöhung 4 in Form einer runden Scheibe ausgebildet. Im Zentrum der Erhöhung 4 befindet sich eine trichterförmige Öffnung 5, die in die Querverbindung 7 mündet .Within the connector 2, an elevation 4 in the form of a round disk is formed concentrically on the tubular base body 1. In the center of the elevation 4 there is a funnel-shaped opening 5 which opens into the cross connection 7.
An der trichterförmigen Öffnung 5 des rohrförmigen Grundkörpers 1 liegt ein sich verjüngendes Ende 8 eines Zwischenstücks 9 druckdicht an. Das Zwischenstück 9 hat die Form eines Hohlzylinders und wird mit Hilfe einer Haltemutter 11 zwischen der Kraftstoffleitung 10 und dem rohrförmigen Grundkörper 1 verspannt . Zu diesem Zweck wirkt das Innengewinde der Haltemutter 11 mit dem Außengewinde des Anschlussstücks 2 zusammen. Im zusammengebauten Zustand erstreckt sich die Kraftstoffleitung 10 durch eine kreisrunde Aussparung 18, die mittig in der Haltemutter 11 vorgesehen ist .At the funnel-shaped opening 5 of the tubular base body 1, a tapering end 8 of an intermediate piece 9 bears in a pressure-tight manner. The intermediate piece 9 has the shape of a hollow cylinder and is clamped between the fuel line 10 and the tubular base body 1 with the aid of a retaining nut 11. For this purpose, the internal thread of the retaining nut 11 interacts with the external thread of the connector 2. In the assembled state, the fuel line 10 extends through a circular recess 18, which is provided centrally in the holding nut 11.
Bei dem Anschlussstück 2, dem Zwischenstück 9, derIn the connection piece 2, the intermediate piece 9, the
Kraftεtoffleitung 10 und der Haltemutter 11 handelt es sich um rotationssymmetrische Teile. Links und rechts der Rotationsachse 19 sind zwei unterschiedliche Ausführungsformen der Erfindung dargestellt.Kraftεtoffleitung 10 and the retaining nut 11 are rotationally symmetrical parts. Left and right of the Rotation axis 19 two different embodiments of the invention are shown.
Bei der auf der linken Seite der Rotationsachse 19 dargestellten Ausführungsform verjüngt sich das Zwischenstück 9 an seinem von dem rohrförmigen GrundkörperIn the embodiment shown on the left side of the axis of rotation 19, the intermediate piece 9 tapers on its tubular base body
I abgewandten Ende 12. Das sich verjüngende Ende 12 des Zwischenstücks 9 wirkt mit einem komplementären Dichtkonus 13 an der Kraftstoffleitung 10 zusammen. Um ein Aufweiten des an dem Zwischenstück anliegenden Endes der Kraftstoffleitung 10 zu verhindern, ist an der HaltemutterI facing away from the end 12. The tapered end 12 of the intermediate piece 9 interacts with a complementary sealing cone 13 on the fuel line 10. In order to prevent the end of the fuel line 10 abutting against the intermediate piece, the holding nut is on the holding nut
II eine Abstützflache 14 ausgebildet, die an einem Bund 17 anliegt, der an dem Ende der Kraftstoffleitung 10 ausgebildet ist.II a support surface 14 is formed, which abuts a collar 17 which is formed at the end of the fuel line 10.
Außerdem ist an der Stirnseite der Haltemutter 11 eine kreisringförmige Spannfläche 15 ausgebildet. Über die Spannfläche 15 wird der an der Kraftstoffleitung 10 ausgebildete Dichtkonus 13 gegen das sich verjüngende Ende 12 des Zwischenstücks 9 gedrückt. Darüberhinaus wird das sich verjüngende Ende 8 des Zwischenstücks 9 in die trichterförmige Öffnung 5 des rohrförmigen Grundkörpers 1 gedrückt. Durch einen Strich 16 ist angedeutet, dass die Kraftstoffleitung 10 im zusammengebauten Zustand um einen Winkel von etwa 10° ausgelenkt werden kann.In addition, an annular clamping surface 15 is formed on the end face of the holding nut 11. The sealing cone 13 formed on the fuel line 10 is pressed against the tapered end 12 of the intermediate piece 9 via the clamping surface 15. In addition, the tapered end 8 of the intermediate piece 9 is pressed into the funnel-shaped opening 5 of the tubular base body 1. A dash 16 indicates that the fuel line 10 can be deflected by an angle of approximately 10 ° in the assembled state.
Ein wesentlicher Aspekt der vorliegenden Erfindung ist darin zu sehen, dass das Innere der Kraftstoffleitung 10 über das Zwischenstück 9 mit dem Innenraum 6 des rohrförmigen Grundkörpers 1 hochdruckdicht verbunden ist, ohne dass die Verbindung zwischen dem Anschlussstück 2 und dem rohrförmigen Grundkörper 1 hochdruckdicht ausgelegt werden muss. Dennoch ist im eingebauten Zustand eine ausreichende Beweglichkeit der Kraftstoffleitung 10 gegeben, wie durch den Strich 16 angedeutet ist. Bei der auf der rechten Seite der Rotationsachse 19 dargestellten Ausführungsform ist das von dem rohrförmigen Grundkörper 1 abgewandte Ende 22 des Zwischenstücks 9 trichterförmig ausgebildet. An dem trichterförmigen Ende 22 des Zwischenstücks 9 befindet sich ein komplementärer Dichtkonus 23 in Anlage, der am Ende der Kraftstoffleitung 10 ausgebildet ist. Um eine Aufweitung des Zwischenstücks 9 in diesem Bereich zu vermeiden, ist an dem Anschlussstück 2 eine Abstützflache 24 vorgesehen, die an dem äußeren Umfang des Zwischenstücks 9 anliegt.An essential aspect of the present invention can be seen in the fact that the interior of the fuel line 10 is connected to the interior 6 of the tubular base body 1 via the intermediate piece 9 with high pressure tightness, without the connection between the connection piece 2 and the tubular base body 1 having to be designed so as to be high pressure tight , Nevertheless, there is sufficient mobility of the fuel line 10 in the installed state, as indicated by the line 16. In the embodiment shown on the right side of the axis of rotation 19, the end 22 of the intermediate piece 9 facing away from the tubular base body 1 is funnel-shaped. At the funnel-shaped end 22 of the intermediate piece 9 is a complementary sealing cone 23 in contact, which is formed at the end of the fuel line 10. In order to avoid widening of the intermediate piece 9 in this area, a support surface 24 is provided on the connecting piece 2, which abuts the outer circumference of the intermediate piece 9.
Das Verspannen des Zwischenstücks 9 zwischen der Kraftstoffleitung 10 und dem rohrförmigen Grundkörper 1 wird durch eine Spannfläche 25 erreicht, die an der Haltemutter 11 ausgebildet ist. Durch einen Strich 26 ist angedeutet, dass auch bei dieser Ausführungsform eine ausreichende Auslenkung der Kraftstoffleitung 10 im eingebauten Zustand möglich ist.The tensioning of the intermediate piece 9 between the fuel line 10 and the tubular base body 1 is achieved by a clamping surface 25 which is formed on the retaining nut 11. A dash 26 indicates that sufficient deflection of the fuel line 10 in the installed state is also possible in this embodiment.
Die Beweglichkeit der Kraftstoffleitung 10 wird durch den geringen Abstand zwischen dem Dichtkonus 13, 23 am Ende der Kraftstoffleitung 10 und der Spannfläche 15, 25 gewährleistet. Außerdem muss die Größe der Aussparung 18 ausreichend bemessen sein. The mobility of the fuel line 10 is ensured by the small distance between the sealing cone 13, 23 at the end of the fuel line 10 and the clamping surface 15, 25. In addition, the size of the recess 18 must be sufficiently large.

Claims

Ansprüche Expectations
1. Kraftstoffhochdruckspeicher für ein Common-Rail- Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit mehreren Anschlussstücken (2) für Kraftstoffleitungen (10) , dadurch gekennzeichnet, dass in den Anschlussstücken (2) zwischen dem Kraftstoffhochdruckspeicher (1) und den Kraftstoffleitungen (10) jeweils ein Zwischenstück (9) angeordnet ist.1. High-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a plurality of connecting pieces (2) for fuel lines (10), characterized in that in the connecting pieces (2) between the high-pressure fuel accumulator (1) and the fuel lines (10) each have an intermediate piece (9) is arranged.
2. Kraftstoffhochdruckspeicher nach Anspruch 1, dadurch gekennzeichnet, dass das Zwischenstück (9) im Wesentlichen die Form eines Hohlzylinders mit zwei konischen Stirnflächen (8; 12, 22) aufweist, die mit komplementären Stirnflächen (5; 13, 22) an dem Kraftstoffhochdruckspeicher2. High-pressure fuel accumulator according to claim 1, characterized in that the intermediate piece (9) has essentially the shape of a hollow cylinder with two conical end faces (8; 12, 22), which with complementary end faces (5; 13, 22) on the high-pressure fuel store
(1) und der zugehörigen Kraftstoffleitung (10) zusammenwirken .(1) and the associated fuel line (10) cooperate.
3. Kraftstoffhochdruckspeicher nach Anspruch 2, dadurch gekennzeichnet, dass an dem Anschlussstück (2) ein Außengewinde vorgesehen ist, das mit dem Innengewinde einer Haltemutter (11) so zusammenwirkt, dass die3. High-pressure fuel accumulator according to claim 2, characterized in that an external thread is provided on the connecting piece (2), which cooperates with the internal thread of a retaining nut (11) so that the
Kraftstoffleitung (10) mit ihrem freien Ende gegen das Zwischenstück (9) , und das Zwischenstück (9) gegen den Kraftstoffhochdruckspeicher (1) verspannt wird.Fuel line (10) with its free end against the intermediate piece (9), and the intermediate piece (9) against the high-pressure fuel reservoir (1) is clamped.
4. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich das zu dem Kraftstoffhochdruckspeicher (1) gewandte Ende (8) des Zwischenstücks (9) verjüngt.4. High-pressure fuel reservoir according to one of the preceding claims, characterized in that the end facing the high-pressure fuel reservoir (1) (8) of the intermediate piece (9) tapers.
5. Kraftstoffhochdruckspeicher nach Anspruch 4, dadurch gekennzeichnet, dass sich das von dem5. High-pressure fuel accumulator according to claim 4, characterized in that that of the
Kraftstoffhochdruckspeicher (1) abgewandte Ende (12) des Zwischenstücks (9) verjüngt, und dass an der Haltemutter (11) eine radiale Abstützflache (14) für die Kraftstoffleitung (10) ausgebildet ist.High-pressure fuel reservoir (1) tapers away from the end (12) of the intermediate piece (9), and that a radial support surface (14) for the fuel line (10) is formed on the retaining nut (11).
6. Kraftstoffhochdruckspeicher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das von dem6. High-pressure fuel accumulator according to one of claims 1 to 4, characterized in that the
Kraftstoffhochdruckspeicher (1) abgewandte Ende (22) des Zwischenstücks (9) trichterförmig ausgebildet ist, und dass sich das Zwischenstück (9) zumindest mit einem Teil (24) seiner äußeren Mantelfläche an der inneren Umfangsflache des Anschlussstücks (2) abstützt.High-pressure fuel accumulator (1) facing away from the end (22) of the intermediate piece (9) is funnel-shaped, and that the intermediate piece (9) is supported at least with a part (24) of its outer lateral surface on the inner peripheral surface of the connecting piece (2).
7. Kraftstoffhochdruckspeicher nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass die Anschlussstücke (2) an den Kraftstoffhochdruckspeicher (1) angeschweißt sind. 7. High-pressure fuel reservoir according to one of claims 2 to 6, characterized in that the connecting pieces (2) are welded to the high-pressure fuel reservoir (1).
EP00962180A 1999-08-03 2000-08-01 High pressure fuel accumulator Expired - Lifetime EP1117925B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19936535 1999-08-03
DE19936535A DE19936535A1 (en) 1999-08-03 1999-08-03 High pressure fuel accumulator
PCT/DE2000/002528 WO2001009506A1 (en) 1999-08-03 2000-08-01 High pressure fuel accumulator

Publications (2)

Publication Number Publication Date
EP1117925A1 true EP1117925A1 (en) 2001-07-25
EP1117925B1 EP1117925B1 (en) 2005-11-09

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EP00962180A Expired - Lifetime EP1117925B1 (en) 1999-08-03 2000-08-01 High pressure fuel accumulator

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US (1) US6609502B1 (en)
EP (1) EP1117925B1 (en)
JP (1) JP4518459B2 (en)
KR (1) KR100727505B1 (en)
AT (1) ATE309463T1 (en)
CZ (1) CZ296998B6 (en)
DE (2) DE19936535A1 (en)
WO (1) WO2001009506A1 (en)

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Publication number Publication date
US6609502B1 (en) 2003-08-26
KR100727505B1 (en) 2007-06-12
CZ20011140A3 (en) 2002-01-16
JP4518459B2 (en) 2010-08-04
CZ296998B6 (en) 2006-08-16
JP2003506611A (en) 2003-02-18
EP1117925B1 (en) 2005-11-09
DE50011560D1 (en) 2005-12-15
DE19936535A1 (en) 2001-02-15
KR20010075539A (en) 2001-08-09
ATE309463T1 (en) 2005-11-15
WO2001009506A1 (en) 2001-02-08

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