EP1611343B1 - High pressure fuel accumulator - Google Patents

High pressure fuel accumulator Download PDF

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Publication number
EP1611343B1
EP1611343B1 EP04714773A EP04714773A EP1611343B1 EP 1611343 B1 EP1611343 B1 EP 1611343B1 EP 04714773 A EP04714773 A EP 04714773A EP 04714773 A EP04714773 A EP 04714773A EP 1611343 B1 EP1611343 B1 EP 1611343B1
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EP
European Patent Office
Prior art keywords
pressure
bore
pressure fuel
fuel accumulator
housing
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.)
Expired - Lifetime
Application number
EP04714773A
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German (de)
French (fr)
Other versions
EP1611343A1 (en
Inventor
Uwe Nigrin
Mohsen Pirouz
Stefan Portner
Ngoc-Tam Vu
Johann Schneider
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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Publication of EP1611343A1 publication Critical patent/EP1611343A1/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
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors

Definitions

  • the invention relates to a high-pressure fuel accumulator, in particular for common-rail injection systems and a fuel pump with such a high-pressure fuel accumulator.
  • a high-pressure fuel storage which consists essentially of a drawn or rolled tube.
  • connection nipples are welded or soldered.
  • the front-side open ends of the tube are each closed by a closure element.
  • special designs of the closure element are required.
  • the sealing ball has a greater hardness than the sealing seat, which deforms this and ensures a tight fit. Due to pressure fluctuations within the accumulator as well as settling of the thread, leaks in the high-pressure fuel accumulator can nevertheless occur.
  • the object of the invention is therefore to provide a high-pressure fuel storage, which ensures a simple and cost-effective production of a secure seal of the high-pressure fuel storage.
  • the invention is characterized in that the pressure chamber is formed as a blind hole or as a through hole and is closed by a tie rod or a tie rod nut connection.
  • the tie rod is bolted to a high torque. As a result, a tensile stress acts in the tie rod, which always ensures a reliable seal of the pressure chamber even with pressure fluctuations.
  • the pressure chamber volume can be adapted to the respective requirements.
  • the manufacturing cost of the high-pressure fuel storage reduce significantly.
  • a component is arranged on or around the tie rod to adapt the pressure chamber volume.
  • both the pressure accumulator itself, as well as the tie rod be made the same for each engine variant and it is only one additional component required. There are no special requirements with regard to its strength to be considered in this component, so that it can be produced particularly inexpensively.
  • the tie rod has a sealing cone on its head, which rests in the mounted state on a, in a first end-side opening in the housing, complementarily formed sealing cone. This results in a simple way a metallic seal between the tie rod and the frontal opening in the housing.
  • the clamping nut When using a tie rod-nut connection, the clamping nut also has a sealing cone which rests in the mounted state on a, in a second end opening in the housing, complementarily formed sealing cone. Consequently Here, too, ensures a safe and simple seal between the clamping nut and the frontal opening in the housing.
  • an additional seal is arranged between the housing and the tie rod, or between the housing and the clamping nut. This prevents that any leakage current emerging via the metal seal can escape from the high-pressure fuel accumulator.
  • an additional seal is preferably an elastomeric seal, for example in the form of a simple O-ring seal.
  • the high-pressure fuel accumulator is integrated into the housing of a fuel pump. This results in a particularly compact design.
  • the pump does not have to be changed, or only slightly changed.
  • the high-pressure fuel storage 1 consists essentially of the housing 2 with a pressure chamber 3.
  • the pressure chamber 3 is formed as a through hole.
  • the pressure chamber 3 has an inlet 4 and four outlets 5 (two visible in the sectional view).
  • the inlet 4 and the expirations 5 open radially into the pressure chamber 3.
  • the frontal openings of the high-pressure fuel storage 1 are closed with a tie rod nut connection 6, 7.
  • the tie rod 6, inserted substantially axially through the pressure chamber 3 and screwed on the opposite side with a nut 7.
  • By screwing the tie rod nut connection 6, 7 tensile stresses are introduced into the tie rod 6, which ensure a secure seal of the pressure chamber 3.
  • the tie rod 6 has at its head a sealing cone 8, which rests in the assembled state on a sealing cone 9 formed in the housing of the high-pressure fuel accumulator 2 complementary.
  • the nut 7 also has a sealing cone 10, which rests in the mounted state on another in the housing of the fuel reservoir 2 complementary formed sealing cone 11. Due to the bracing of the tie rod with the nut 7, the sealing cones 8 and 9 and the sealing cones 10 and 11 each pressed firmly against each other, resulting in a secure metallic seal of the pressure chamber 3.
  • the tie rod 6 and the nut 7 each have an annular groove for receiving an additional seal 12, 13.
  • an additional seal for example, an O-ring can be used.
  • the nut 7 has an axial pressure bore and a receptacle 14 for a high-pressure sensor.
  • the pressure bore is connected via an additional bore in the nut or via a flattening in the thread of the nut with the pressure chamber.
  • the annular pressure space 3 i. the pressure chamber volume of the high-pressure fuel storage vary and adapt to the respective requirements.
  • a special high-pressure accumulator does not have to be produced for each engine variant, but only a tie rod with a corresponding diameter must be used.
  • the size of the storage volume of the pressure chamber 3 is adjustable.
  • a component is suitable for this purpose, for example, a simple sleeve.
  • the use of a sleeve has the additional advantage that both the same housing and the same tie rod can be used for all desired pressure chamber volumes. This results in a very cost-effective production of high-pressure fuel storage at the same time high flexibility of the system.
  • FIG. 2 shows a further section through the high-pressure fuel accumulator 1 in another sectional plane.
  • the high-pressure fuel storage is shown in unassembled state.
  • 11 two relief holes 15 are provided in the area of the sealing cones 9, 11 two relief holes 15 are provided.
  • the discharge holes 15 may be discharged any leakage current.
  • the relief wells are connected to the low-pressure region of the fuel injection system or leads directly into the fuel tank. This can not lead to a pressure increase in front of the additional seals 12, 13 (see FIG. 1) and thus damage to these seals.
  • Figure 3 shows a second embodiment of the high-pressure fuel storage 1.
  • the embodiment corresponds essentially to the high-pressure fuel storage of Figure 1.
  • the tie rod but not braced with a nut, but bolted directly to the housing 2 of the high-pressure fuel storage.
  • the embodiment corresponds to the embodiment of Figure 1 and 2, to the description of which reference is made here.
  • FIG. 4 shows a high-pressure fuel pump 18, in which the high-pressure fuel accumulator 1 according to the invention is integrated directly into the housing 19 of the fuel pump.
  • the pump housing 19 remain substantially unchanged, since the design of the pump housing 19 as a high pressure resistant component at certain points of the pump housing sufficient material reserves are available to integrate the high-pressure fuel storage 1.
  • high-pressure fuel outputs 17 are formed, which are each connected to the individual injectors of the internal combustion engine.
  • the integration of the high-pressure fuel accumulator 1 in the fuel pump 18 results in a very compact design of the fuel syringe system.
  • the cost-intensive production of an additional high-pressure fuel accumulator is eliminated.
  • a Anschlußplateau 16 is provided on the housing of the high-pressure fuel storage.
  • FIG. 5 shows a detailed view of the fuel pump of Figure 4.
  • a connecting bore 20 Between the pressure chamber 3 and the bore for receiving the pump shaft 21 is a connecting bore 20.
  • a pressure limiting valve 22 is arranged in the connecting bore 20.
  • the fuel via the pressure limiting valve, can flow out of the pressure chamber 3.
  • a fuel return line 23 which is introduced in the bore for receiving the pump shaft 21, the fuel can flow back further into the low-pressure region of the fuel injection system.
  • the pressure relief valve 22 may be formed as a simple mechanical pressure relief valve be.
  • On the use of an additional pressure control valve to the high-pressure pump or accumulator as it is commonly used in injection systems can be dispensed with. This results in significant cost savings and simplifications of the entire system.
  • the invention thus relates to a high-pressure fuel accumulator, the front-side openings is closed safely and inexpensively by a tie rod or a tie rod nut connection.
  • the pressure chamber volume can be adapted to the respective requirements in a very simple and cost-effective manner without additional changes to the high-pressure fuel storage itself are necessary.
  • the integration of the high-pressure fuel accumulator in the existing space of a fuel pump results in a very compact design. Due to the additional integration of a pressure relief valve can be dispensed with the use of an otherwise necessary pressure control valve to the high-pressure fuel pump or high-pressure accumulator. Overall, this results in a very compact fuel injection system, which is very variable to adapt to the particular requirements and ensures a cost-effective production reliable sealing of the high-pressure fuel storage.
  • the invention is not limited to the embodiments shown in the figures.
  • the high-pressure fuel accumulator which is integrated in the fuel pump, only as a distributor rail and additionally to use even more high-pressure fuel storage.

Description

Die Erfindung betrifft einen Kraftstoffhochdruckspeicher insbesondere für Common-Rail Einspritzsysteme sowie eine Kraftstoffpumpe mit einem solchen Kraftstoffhochdruckspeicher.The invention relates to a high-pressure fuel accumulator, in particular for common-rail injection systems and a fuel pump with such a high-pressure fuel accumulator.

Aus der EP 0 866 221 A1 ist ein Kraftstoffhochdruckspeicher bekannt, der im wesentlichen aus einem gezogenen oder gewalzten Rohr besteht. Am Umfang des Kraftstoffverteilers sind radial angeordnete Anschlussnippel angeschweißt oder gelötet. Die stirnseitigen offenen Enden des Rohres sind jeweils mit einem Verschlusselement verschlossen. Um bei den hohen Systemdrücken von bis zu 1800 bar eine sichere Abdichtung zu gewährleisten sind spezielle Ausführungen des Verschlusselements erforderlich. Hierzu schlägt die EP 0 866 221 A1 vor, das Verschlusselement mit einer zusätzlichen Dichtkugel zu versehen. Durch Anziehen des Gewindestopfens wird die Dichtkugel in den Dichtsitz des Kraftstoffhochdruckspeicher gepresst. Die Dichtkugel weist dabei eine größere Härte als der Dichtsitz auf, wodurch sich dieser verformt und einen dichten Sitz gewährleistet. Aufgrund von Druckschwankungen innerhalb des Druckspeichers sowie durch Setzerscheinungen des Gewindes kann es trotzdem zu Undichtigkeiten am Kraftstoffhochdruckspeicher kommen.From the EP 0 866 221 A1 a high-pressure fuel storage is known, which consists essentially of a drawn or rolled tube. At the periphery of the fuel distributor radially arranged connection nipples are welded or soldered. The front-side open ends of the tube are each closed by a closure element. In order to ensure a secure seal at the high system pressures of up to 1800 bar, special designs of the closure element are required. For this the beats EP 0 866 221 A1 to provide the closure element with an additional sealing ball. By tightening the threaded plug, the sealing ball is pressed into the sealing seat of the high-pressure fuel storage. The sealing ball has a greater hardness than the sealing seat, which deforms this and ensures a tight fit. Due to pressure fluctuations within the accumulator as well as settling of the thread, leaks in the high-pressure fuel accumulator can nevertheless occur.

Aufgabe der Erfindung ist es daher, einen Kraftstoffhochdruckspeicher zu schaffen, der bei einfacher und kostengünstiger Herstellung eine sichere Abdichtung des Kraftstoffhochdruckspeichers gewährleistet.The object of the invention is therefore to provide a high-pressure fuel storage, which ensures a simple and cost-effective production of a secure seal of the high-pressure fuel storage.

Diese Aufgabe wird gelöst durch die Merkmale der unabhängigen Patentansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.This object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung zeichnet sich dadurch aus, dass der Druckraum als Sacklochbohrung oder als Durchgangsbohrung ausgebildet ist und mit einem Zuganker bzw. einer Zuganker-Mutterverbindung verschlossen ist.The invention is characterized in that the pressure chamber is formed as a blind hole or as a through hole and is closed by a tie rod or a tie rod nut connection.

Der Zuganker wird mit einem hohen Anzugsmoment verschraubt. Hierdurch wirkt im Zuganker eine Zugspannung, die auch bei Druckschwankungen stets eine sichere Abdichtung des Druckraums gewährleistet.The tie rod is bolted to a high torque. As a result, a tensile stress acts in the tie rod, which always ensures a reliable seal of the pressure chamber even with pressure fluctuations.

Durch die Verwendung von Zugankern mit unterschiedlichem Durchmesser lässt sich das Druckraumvolumen an die jeweiligen Erfordernisse anpassen. Somit ist es nicht mehr notwendig, für jede Motorvariante einen Kraftstoffhochdruckspeicher mit entsprechendem Druckraumvolumen herzustellen. Hierdurch verringern sich die Herstellungskosten des Kraftstoffhochdruckspeichers erheblich.By using tie rods with different diameters, the pressure chamber volume can be adapted to the respective requirements. Thus, it is no longer necessary to produce a high-pressure fuel storage with an appropriate pressure chamber volume for each engine variant. As a result, the manufacturing cost of the high-pressure fuel storage reduce significantly.

In einer vorteilhaften Ausgestaltung des Kraftstoffhochdruckspeichers wird zum Anpassen des Druckraumvolumens ein Bauteil, auf oder um den Zuganker herum, angeordnet. Hierdurch kann sowohl der Druckspeicher selbst, als auch der Zuganker, für jede Motorvariante gleich ausgeführt sein und es ist jeweils nur ein zusätzliches Bauteil erforderlich. An dieses Bauteil sind keine besonderen Anforderungen hinsichtlich seiner Festigkeit zu beachten, so dass es besonders kostengünstig hergestellt werden kann.In an advantageous embodiment of the high-pressure fuel accumulator, a component is arranged on or around the tie rod to adapt the pressure chamber volume. In this way, both the pressure accumulator itself, as well as the tie rod, be made the same for each engine variant and it is only one additional component required. There are no special requirements with regard to its strength to be considered in this component, so that it can be produced particularly inexpensively.

In einer weiteren bevorzugten Ausgestaltung der Erfindung weist der Zuganker an seinem Kopf einen Dichtkonus auf, der im montierten Zustand an einem, in einer ersten stirnseitigen Öffnung im Gehäuse, komplementär ausgebildeten Dichtkonus, anliegt. Hierdurch ergibt sich auf einfache Weise eine metallische Abdichtung zwischen dem Zuganker und der stirnseitigen Öffnung im Gehäuse.In a further preferred embodiment of the invention, the tie rod has a sealing cone on its head, which rests in the mounted state on a, in a first end-side opening in the housing, complementarily formed sealing cone. This results in a simple way a metallic seal between the tie rod and the frontal opening in the housing.

Bei Verwendung einer Zuganker-Mutterverbindung weist die Spannmutter ebenfalls einen Dichtkonus auf, der im montierten Zustand an einem, in einer zweiten stirnseitigen Öffnung im Gehäuse, komplementär ausgebildeten Dichtkonus, anliegt. Somit wird auch hier eine sichere und einfache Abdichtung zwischen der Spannmutter und der stirnseitigen Öffnung im Gehäuse gewährleistet.When using a tie rod-nut connection, the clamping nut also has a sealing cone which rests in the mounted state on a, in a second end opening in the housing, complementarily formed sealing cone. Consequently Here, too, ensures a safe and simple seal between the clamping nut and the frontal opening in the housing.

In einer weiteren bevorzugten Ausgestaltung der Erfindung ist zwischen dem Gehäuse und dem Zuganker, beziehungsweise zwischen dem Gehäuse und der Spannmutter, eine zusätzliche Dichtung angeordnet. Hierdurch wird verhindert, dass ein eventuell über die Metalldichtung austretender Leckagestrom aus dem Kraftstoffhochdruckspeicher austreten kann. Als zusätzliche Dichtung eignet sich vorzugsweise eine Elastomerdichtung, beispielsweise in Form einer einfachen O-Ringdichtung.In a further preferred embodiment of the invention, an additional seal is arranged between the housing and the tie rod, or between the housing and the clamping nut. This prevents that any leakage current emerging via the metal seal can escape from the high-pressure fuel accumulator. As an additional seal is preferably an elastomeric seal, for example in the form of a simple O-ring seal.

In einer besonders vorteilhaften Ausgestaltung der Erfindung ist der Kraftstoffhochdruckspeicher in das Gehäuse einer Kraftstoffpumpe integriert. Hierdurch ergibt sich eine besonders kompakte Bauform. Die Pumpe muss hierzu nicht, oder nur geringfügig verändert werden.In a particularly advantageous embodiment of the invention, the high-pressure fuel accumulator is integrated into the housing of a fuel pump. This results in a particularly compact design. The pump does not have to be changed, or only slightly changed.

Ausführungsbeispiele der Erfindung werden im folgenden anhand der schematischen Zeichnungen erläutert. Es zeigt:

Figur 1
ein Ausführungsbeispiel des Kraftstoffhochdruckspeichers in Schnittdarstellung im montierten Zustand,
Figur 2
eine weitere Schnittdarstellung des in Figur 1 gezeigten Kraftstoffhochdruckspeichers im unmontierten Zustand,
Figur 3
ein zweites Ausführungsbeispiel eines Kraftstoffhochdruckspeichers in Schnittdarstellung im montierten Zustand,
Figur 4
eine Kraftstoffhochdruckpumpe mit einem in das Pumpengehäuse integriertem Kraftstoffhochdruckspeicher entsprechend Figur 1,
Figur 5
eine Detailansicht der in Figur 4 gezeigten Kraftstoffhochdruckpumpe.
Embodiments of the invention are explained below with reference to the schematic drawings. It shows:
FIG. 1
An embodiment of the high-pressure fuel storage in a sectional view in the assembled state,
FIG. 2
3 is a further sectional view of the high-pressure fuel accumulator shown in FIG. 1 in the unassembled state,
FIG. 3
A second embodiment of a high-pressure fuel storage in sectional view in the assembled state,
FIG. 4
a high-pressure fuel pump with a high-pressure fuel accumulator integrated into the pump housing according to FIG. 1,
FIG. 5
a detailed view of the high-pressure fuel pump shown in Figure 4.

Figur 1 zeigt ein Ausführungsbeispiel des Kraftstoffhochdruckspeichers 1. Der Kraftstoffhochdruckspeicher 1 besteht im wesentlichen aus dem Gehäuse 2 mit einem Druckraum 3. Der Druckraum 3 ist als Durchgangsbohrung ausgebildet. Der Druckraum 3 besitzt einen Zulauf 4 sowie vier Abläufe 5 (zwei davon in der Schnittdarstellung sichtbar). Der Zulauf 4 sowie die Abläufe 5 münden radial in den Druckraum 3. Die stirnseitigen Öffnungen des Kraftstoffhochdruckspeichers 1 sind mit einer Zuganker-Mutterverbindung 6, 7 verschlossen. Hierzu wird der Zuganker 6, im wesentlichen axial, durch den Druckraum 3 hindurch gesteckt und auf der gegenüberliegenden Seite mit einer Mutter 7 verschraubt. Durch das Verschrauben der Zuganker-Mutterverbindung 6, 7 werden Zugspannungen in den Zuganker 6 eingebracht, die für eine sichere Abdichtung des Druckraums 3 sorgen. Der Zuganker 6 weist an seinem Kopf einen Dichtkonus 8 auf, der im montierten Zustand an einen im Gehäuse des Kraftstoffhochdruckspeichers 2 komplementär ausgebildeten Dichtkonus 9 anliegt. Die Mutter 7 weist ebenfalls einen Dichtkonus 10 auf, der im montierten Zustand an einem weiteren im Gehäuse des Kraftstoffspeichers 2 komplementär ausgebildeten Dichtkonus 11 anliegt. Durch das Verspannen des Zugankers mit der Mutter 7 werden die Dichtkonen 8 und 9 sowie die Dichtkonen 10 und 11 jeweils fest aufeinander gepresst, wodurch sich eine sichere metallische Abdichtung des Druckraums 3 ergibt. Zusätzlich weist der Zuganker 6 sowie die Mutter 7 jeweils eine Ringnut zur Aufnahme einer zusätzlichen Dichtung 12, 13 auf. Als zusätzliche Dichtung kann beispielsweise ein O-Ring verwendet werden. Durch die zusätzlichen Dichtungen 12, 13 wird vermieden, dass ein eventuell über die metallischen Dichtung austretende Leckagestrom aus dem Druckraum 3 austreten kann.1 shows an embodiment of the high-pressure fuel accumulator 1. The high-pressure fuel storage 1 consists essentially of the housing 2 with a pressure chamber 3. The pressure chamber 3 is formed as a through hole. The pressure chamber 3 has an inlet 4 and four outlets 5 (two visible in the sectional view). The inlet 4 and the expirations 5 open radially into the pressure chamber 3. The frontal openings of the high-pressure fuel storage 1 are closed with a tie rod nut connection 6, 7. For this purpose, the tie rod 6, inserted substantially axially through the pressure chamber 3 and screwed on the opposite side with a nut 7. By screwing the tie rod nut connection 6, 7 tensile stresses are introduced into the tie rod 6, which ensure a secure seal of the pressure chamber 3. The tie rod 6 has at its head a sealing cone 8, which rests in the assembled state on a sealing cone 9 formed in the housing of the high-pressure fuel accumulator 2 complementary. The nut 7 also has a sealing cone 10, which rests in the mounted state on another in the housing of the fuel reservoir 2 complementary formed sealing cone 11. Due to the bracing of the tie rod with the nut 7, the sealing cones 8 and 9 and the sealing cones 10 and 11 each pressed firmly against each other, resulting in a secure metallic seal of the pressure chamber 3. In addition, the tie rod 6 and the nut 7 each have an annular groove for receiving an additional seal 12, 13. As an additional seal, for example, an O-ring can be used. By means of the additional seals 12, 13, it is avoided that a leakage current possibly exiting via the metallic seal can escape from the pressure chamber 3.

Die Mutter 7 weist eine axiale Druckbohrung sowie eine Aufnahme 14 für einen Hochdrucksensor auf. Die Druckbohrung ist über eine zusätzliche Bohrung in der Mutter oder über eine Abflachung im Gewinde der Mutter mit dem Druckraum verbunden.The nut 7 has an axial pressure bore and a receptacle 14 for a high-pressure sensor. The pressure bore is connected via an additional bore in the nut or via a flattening in the thread of the nut with the pressure chamber.

Durch Verwendung von Zugankern mit unterschiedlichen Durchmessern lässt sich der ringförmige Druckraum 3 d.h. das Druckraumvolumen des Kraftstoffhochdruckspeichers variieren und an die jeweiligen Anforderungen anpassen. Somit muss nicht für jede Motorvariante ein spezieller Hochdruckspeicher hergestellt werden, sondern lediglich ein Zuganker mit einem entsprechenden Durchmesser verwendet werden. Ebenfalls ist es möglich um den Zuganker herum ein Bauteil anzuordnen, durch dessen Größe das Speichervolumen des Druckraums 3 einstellbar ist. Als Bauteil eignet sich hierzu beispielsweise eine einfache Hülse. An die Hülse werden dabei keine besonderen Anforderungen hinsichtlich ihrer Festigkeit gestellt, da sie lediglich das Druckraumvolumen festlegt, jedoch keine Zugspannungen aufnehmen muss. Die Verwendung einer Hülse hat den zusätzlich Vorteil, das für alle gewünschten Druckraumvolumina sowohl das gleiche Gehäuse als auch der gleiche Zuganker verwendet werden kann. Hierdurch ergibt sich eine sehr kostengünstige Herstellung des Kraftstoffhochdruckspeichers bei gleichzeitig hoher Flexibilität des Systems.By using tie rods with different diameters, the annular pressure space 3 i. the pressure chamber volume of the high-pressure fuel storage vary and adapt to the respective requirements. Thus, a special high-pressure accumulator does not have to be produced for each engine variant, but only a tie rod with a corresponding diameter must be used. It is also possible to arrange around the tie rod around a component, the size of the storage volume of the pressure chamber 3 is adjustable. As a component is suitable for this purpose, for example, a simple sleeve. There are no special requirements for the strength of the sleeve, since it only defines the pressure chamber volume, but does not have to absorb any tensile stresses. The use of a sleeve has the additional advantage that both the same housing and the same tie rod can be used for all desired pressure chamber volumes. This results in a very cost-effective production of high-pressure fuel storage at the same time high flexibility of the system.

Figur 2 zeigt einen weiteren Schnitt durch den Kraftstoffhochdruckspeicher 1 in einer anderen Schnittebene. Der Kraftstoffhochdruckspeicher ist dabei in unmontiertem Zustand dargestellt. Im Bereich der Dichtkonen 9, 11 sind zwei Entlastungsbohrungen 15 vorgesehen. Über die Entlastungsbohrungen 15 kann ein eventuell auftretender Leckagestrom abgeführt werden. Die Entlastungsbohrungen sind an den Niederdruckbereich des Kraftstoffeinspritzsystems angeschlossen bzw. führt direkt in den Kraftstofftank. Hierdurch kann es nicht zu einem Druckanstieg vor den zusätzlichen Dichtungen 12, 13 (siehe Fig. 1) und damit zu einer Beschädigung dieser Dichtungen kommen.FIG. 2 shows a further section through the high-pressure fuel accumulator 1 in another sectional plane. The high-pressure fuel storage is shown in unassembled state. In the area of the sealing cones 9, 11 two relief holes 15 are provided. About the discharge holes 15 may be discharged any leakage current. The relief wells are connected to the low-pressure region of the fuel injection system or leads directly into the fuel tank. This can not lead to a pressure increase in front of the additional seals 12, 13 (see FIG. 1) and thus damage to these seals.

Figur 3 zeigt ein zweites Ausführungsbeispiel des Kraftstoffhochdruckspeichers 1. Das Ausführungsbeispiel entspricht im wesentlichen dem Kraftstoffhochdruckspeicher nach Figur 1. Im Gegensatz zum ersten Ausführungsbeispiel wird der Zuganker jedoch nicht mit einer Mutter verspannt, sondern direkt mit dem Gehäuse 2 des Kraftstoffhochdruckspeichers verschraubt. Ansonsten entspricht das Ausführungsbeispiel dem Ausführungsbeispiel nach Figur 1 und 2, auf dessen Beschreibung hier verwiesen wird.Figure 3 shows a second embodiment of the high-pressure fuel storage 1. The embodiment corresponds essentially to the high-pressure fuel storage of Figure 1. In contrast to the first embodiment, the tie rod but not braced with a nut, but bolted directly to the housing 2 of the high-pressure fuel storage. Otherwise, the embodiment corresponds to the embodiment of Figure 1 and 2, to the description of which reference is made here.

Figur 4 zeigt eine Kraftstoffhochdruckpumpe 18, bei der der erfindungsgemäße Kraftstoffhochdruckspeicher 1 direkt in das Gehäuse 19 der Kraftstoffpumpe integriert ist. Hierzu kann das Pumpengehäuse 19 im wesentlichen unverändert bleiben, da durch die Auslegung des Pumpengehäuses 19 als hochdruckfestes Bauteil an bestimmten Stellen des Pumpengehäuses genügend Materialreserven vorhanden sind, um den Kraftstoffhochdruckspeicher 1 zu integrieren. Am Kraftstoffhochdruckspeicher 1 sind Kraftstoffhochdruckausgänge 17 ausgebildet, die jeweils mit den einzelnen Injektoren der Brennkraftmaschine verbunden sind. Durch die Integration des Kraftstoffhochdruckspeichers 1 in die Kraftstoffpumpe 18 ergibt sich eine sehr kompakte Bauform des Kraftstoffeirispritzsystems. Zusätzlich entfällt die kostenintensive Herstellung eines zusätzlichen Kraftstoffhochdruckspeichers. Zum einfachen Anbringen der Kraftstoffhochdruckausgänge an den Kraftstoffhochdruckspeicher ist ein Anschlussplateau 16 am Gehäuse des Kraftstoffhochdruckspeichers vorgesehen.FIG. 4 shows a high-pressure fuel pump 18, in which the high-pressure fuel accumulator 1 according to the invention is integrated directly into the housing 19 of the fuel pump. For this purpose, the pump housing 19 remain substantially unchanged, since the design of the pump housing 19 as a high pressure resistant component at certain points of the pump housing sufficient material reserves are available to integrate the high-pressure fuel storage 1. At high-pressure fuel storage 1 high-pressure fuel outputs 17 are formed, which are each connected to the individual injectors of the internal combustion engine. The integration of the high-pressure fuel accumulator 1 in the fuel pump 18 results in a very compact design of the fuel syringe system. In addition, the cost-intensive production of an additional high-pressure fuel accumulator is eliminated. For easy attachment of the high-pressure fuel outputs to the high-pressure fuel storage a Anschlußplateau 16 is provided on the housing of the high-pressure fuel storage.

Figur 5 zeigt eine Detailansicht der Kraftstoffpumpe nach Figur 4. Zwischen dem Druckraum 3 und der Bohrung zur Aufnahme der Pumpenwelle 21 besteht eine Verbindungsbohrung 20. In der Verbindungsbohrung 20 ist ein Druckbegrenzungsventil 22 angeordnet. Beim Überschreiten eines bestimmten Öffnungsdruckes des Druckbegrenzungsventils kann der Kraftstoff, über das Druckbegrenzungsventil, aus dem Druckraum 3 abfließen. Über eine Kraftstoffrücklaufleitung 23, die in der Bohrung zur Aufnahme der Pumpenwelle 21 eingebracht ist, kann der Kraftstoff weiter in den Niederdruckbereich des Kraftstoffeinspritzsystems zurückfließen. Das Druckbegrenzungsventil 22 kann als einfaches mechanisches Druckbegrenzungsventil ausgebildet sein. Auf den Einsatz eines zusätzlichen Druckregelventils an der Hochdruckpumpe oder am Druckspeicher wie es üblicherweise in Einspritzsystemen verwendet wird, kann verzichtet werden. Hierdurch ergeben sich deutliche Kosteneinsparungen und Vereinfachungen des gesamten Systems.Figure 5 shows a detailed view of the fuel pump of Figure 4. Between the pressure chamber 3 and the bore for receiving the pump shaft 21 is a connecting bore 20. In the connecting bore 20, a pressure limiting valve 22 is arranged. When a certain opening pressure of the pressure relief valve is exceeded, the fuel, via the pressure limiting valve, can flow out of the pressure chamber 3. Via a fuel return line 23, which is introduced in the bore for receiving the pump shaft 21, the fuel can flow back further into the low-pressure region of the fuel injection system. The pressure relief valve 22 may be formed as a simple mechanical pressure relief valve be. On the use of an additional pressure control valve to the high-pressure pump or accumulator as it is commonly used in injection systems can be dispensed with. This results in significant cost savings and simplifications of the entire system.

Die Erfindung betrifft somit einen Kraftstoffhochdruckspeicher, dessen stirnseitige Öffnungen durch einen Zuganker bzw. eine Zuganker-Mutterverbindung sicher und kostengünstig verschlossen wird. Durch Variation des Zugankerdurchmessers bzw. durch Verwendung eines zusätzlichen Bauteils, welches um den Zuganker herum angeordnet ist, kann das Druckraumvolumen auf sehr einfache und kostengünstige Weise an die jeweiligen Anforderungen angepasst werden ohne dass zusätzliche Veränderungen am Kraftstoffhochdruckspeicher selbst notwendig sind. Durch die Integration des Kraftstoffhochdruckspeichers in den vorhandenen Bauraum einer Kraftstoffpumpe ergibt sich eine sehr kompakte Bauform. Durch die zusätzliche Integration eines Druckbegrenzungsventils kann auf die Verwendung eines sonst notwendigen Druckregelventils an der Kraftstoffhochdruckpumpe oder dem Hochdruckspeicher verzichtet werden. Insgesamt ergibt sich somit ein sehr kompaktes Kraftstoffeinspritzsystem, welches sehr variabel an die jeweiligen Anforderungen anzupassen ist und das bei kostengünstiger Herstellung eine sichere Abdichtung des Kraftstoffhochdruckspeichers gewährleistet.The invention thus relates to a high-pressure fuel accumulator, the front-side openings is closed safely and inexpensively by a tie rod or a tie rod nut connection. By varying the Zugankerdurchmessers or by using an additional component which is arranged around the tie rod, the pressure chamber volume can be adapted to the respective requirements in a very simple and cost-effective manner without additional changes to the high-pressure fuel storage itself are necessary. The integration of the high-pressure fuel accumulator in the existing space of a fuel pump results in a very compact design. Due to the additional integration of a pressure relief valve can be dispensed with the use of an otherwise necessary pressure control valve to the high-pressure fuel pump or high-pressure accumulator. Overall, this results in a very compact fuel injection system, which is very variable to adapt to the particular requirements and ensures a cost-effective production reliable sealing of the high-pressure fuel storage.

Selbstverständlich ist die Erfindung nicht auf die in den Figuren gezeigten Ausführungsbeispielen beschränkt. Insbesondere ist es möglich, den Kraftstoffhochdruckspeicher, welcher in der Kraftstoffpumpe integriert ist, lediglich als Verteiler-Rail zu verwenden und zusätzlich noch weitere Kraftstoffhochdruckspeicher zu verwenden.Of course, the invention is not limited to the embodiments shown in the figures. In particular, it is possible to use the high-pressure fuel accumulator, which is integrated in the fuel pump, only as a distributor rail and additionally to use even more high-pressure fuel storage.

Claims (17)

  1. High-pressure fuel accumulator (1) , in particular for a common rail injection system, with a housing (2) in which a pressure chamber (3) is inserted, and having at least one inlet (4) and at least one outlet (5),
    characterised in that
    the pressure chamber (3) is implemented as a through bore and said through bore is sealed with a tie rod nut connection (6) (7).
  2. High-pressure fuel accumulator (1) , in particular for a common rail injection system, with a housing (2) in which a pressure chamber (3) is inserted, and having at least one inlet (4) and at least one outlet (5),
    characterised in that
    the pressure chamber (3) is implemented as a blind bore, said blind bore being sealed with a tie rod (6) which is screwed to the housing (2).
  3. High-pressure fuel accumulator according to claim 1 or 2,
    characterised in that
    there is disposed on or around the tie rod (6) a component whose size can be used to adjust the capacity of the pressure chamber (3) .
  4. High-pressure fuel accumulator according to one of the preceding claims,
    characterised in that
    on the tie rod (6) there is implemented a sealing cone (8) which, in the installed state, bears on a sealing cone (9) implemented in a complementary manner in the housing (2).
  5. High-pressure fuel accumulator according to claim 1, 3 or 4,
    characterised in that
    on the lock nut (7) there is implemented a sealing cone (10) which, in the installed state, bears on a sealing cone (11) implemented in a complementary manner in the housing (2).
  6. High-pressure fuel accumulator according to one of the preceding claims,
    characterised in that
    an additional seal (12) is disposed between the housing (2) and the tie rod (6).
  7. High-pressure fuel accumulator according to claim 1, 3, 4, 5 or 6,
    characterised in that
    an additional seal (13) is disposed between the housing (2) and the lock nut (7).
  8. High-pressure fuel accumulator according to claim 6 or 7,
    characterised in that
    the additional seal (12) (13) is an elastomeric seal.
  9. High-pressure fuel accumulator according to one of the preceding claims,
    characterised in that
    the lock nut (7) or the housing (2) has a pressure bore and, connected to said pressure bore, a mount (14) for a high-pressure sensor (24).
  10. High-pressure fuel accumulator according to claim 9,
    characterised in that
    the pressure bore is connected to the pressure chamber (3) via an additional bore in the lock nut or in the housing.
  11. High-pressure fuel accumulator according to claim 9,
    characterised in that
    the pressure bore is connected to the pressure chamber (3) via a flat spot in the thread of the lock nut (7) or a flat spot in the thread of the tie rod (6).
  12. High-pressure fuel accumulator according to one of the preceding claims,
    characterised in that there is implemented in the region of the cone sealing surfaces a relief bore (15) via which any possible leakage flow can escape.
  13. High-pressure fuel accumulator according to claim 12,
    characterised in that the relief bore (15) is connected to the low-pressure region of the injection system.
  14. High-pressure fuel accumulator according to one of the preceding claims,
    characterised in that
    there is implemented on the high-pressure accumulator (1) a connection plateau (16) into which one or more high-pressure connections (5) are inserted.
  15. Fuel pump with a high-pressure fuel accumulator according to one of the preceding claims,
    characterised in that
    the housing (19) of the fuel pump (18) is simultaneously the housing of the high-pressure fuel accumulator.
  16. Fuel pump according to claim 15,
    characterised in that
    between the pressure chamber (3) of the high-pressure fuel accumulator and a bore (21) for accommodating the pump shaft there is implemented a connecting bore (20) into which the pressure limiting valve (22) is inserted and via which the fuel can escape from the pressure chamber if an opening pressure of the pressure limiting valve is exceeded.
  17. Fuel pump according to claim 16,
    characterised in that
    in the bore (21) for accommodating the pump shaft there is implemented a fuel return line (23) via which the fuel can flow back into the low-pressure region of the injection system.
EP04714773A 2003-03-04 2004-02-26 High pressure fuel accumulator Expired - Lifetime EP1611343B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10309311A DE10309311B4 (en) 2003-03-04 2003-03-04 Fuel high pressure storage
PCT/EP2004/001936 WO2004079182A1 (en) 2003-03-04 2004-02-26 High pressure fuel accumulator

Publications (2)

Publication Number Publication Date
EP1611343A1 EP1611343A1 (en) 2006-01-04
EP1611343B1 true EP1611343B1 (en) 2008-01-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04714773A Expired - Lifetime EP1611343B1 (en) 2003-03-04 2004-02-26 High pressure fuel accumulator

Country Status (6)

Country Link
US (2) US7040289B2 (en)
EP (1) EP1611343B1 (en)
JP (1) JP4200163B2 (en)
CN (1) CN100416088C (en)
DE (2) DE10309311B4 (en)
WO (1) WO2004079182A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4651030B2 (en) * 2006-05-31 2011-03-16 本田技研工業株式会社 Fuel supply device
JP4616817B2 (en) * 2006-11-10 2011-01-19 三菱重工業株式会社 Accumulated fuel injection system for engines
US8622046B2 (en) 2010-06-25 2014-01-07 Caterpillar Inc. Fuel system having accumulators and flow limiters
DE102011077618A1 (en) * 2011-06-16 2012-12-20 Robert Bosch Gmbh Injector, in particular fuel injector for an internal combustion engine
CN114992014A (en) * 2022-05-26 2022-09-02 淄柴机器有限公司 Methanol fuel accumulator and marine engine system

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DE4405432C1 (en) * 1994-02-21 1995-02-02 Daimler Benz Ag High pressure accumulator as fuel distribution pipe, especially for an internal combustion engine with common-rail system
CN2253401Y (en) * 1995-12-15 1997-04-30 天津大学 Oil supply rate controllable electric control oil jet for diesel engine
EP0826873B1 (en) * 1996-08-24 2000-05-24 Volkswagen Aktiengesellschaft Device for distributing fuel for a combustion engine
DE19744762A1 (en) * 1997-03-18 1998-10-01 Poppe & Potthoff Gmbh & Co Injection device for a diesel engine
EP0915252A3 (en) * 1997-11-05 2000-03-15 SIG Schweizerische Industrie-Gesellschaft Common rail fuel injection system
DE19936533A1 (en) * 1999-08-03 2001-02-15 Bosch Gmbh Robert High pressure fuel accumulator
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DE19948255A1 (en) * 1999-10-07 2001-04-12 Bosch Gmbh Robert High pressure fuel reservoir for common-rail fuel injection system for autombile engine has base body enclosed by mantle body with control pressure space between them
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US6640783B2 (en) * 2001-02-15 2003-11-04 Delphi Technologies, Inc. Composite fuel rail with integral damping and a co-injected non-permeation layer
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JP3856206B2 (en) * 2001-11-06 2006-12-13 株式会社デンソー Accumulated container and method for manufacturing the same
US20050047935A1 (en) * 2003-08-28 2005-03-03 Weiss Leland W. Steam powered free piston pump

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Publication number Publication date
DE10309311B4 (en) 2005-01-05
JP2006509963A (en) 2006-03-23
US7182069B2 (en) 2007-02-27
EP1611343A1 (en) 2006-01-04
DE502004005960D1 (en) 2008-03-06
US20050247291A1 (en) 2005-11-10
JP4200163B2 (en) 2008-12-24
US20050011495A1 (en) 2005-01-20
CN1697922A (en) 2005-11-16
CN100416088C (en) 2008-09-03
US7040289B2 (en) 2006-05-09
DE10309311A1 (en) 2004-09-23
WO2004079182A1 (en) 2004-09-16

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