EP1332285B1 - Fuel injection system - Google Patents

Fuel injection system Download PDF

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Publication number
EP1332285B1
EP1332285B1 EP01993764A EP01993764A EP1332285B1 EP 1332285 B1 EP1332285 B1 EP 1332285B1 EP 01993764 A EP01993764 A EP 01993764A EP 01993764 A EP01993764 A EP 01993764A EP 1332285 B1 EP1332285 B1 EP 1332285B1
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EP
European Patent Office
Prior art keywords
fuel injection
seal carrier
inlet section
injection system
fuel
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
EP01993764A
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German (de)
French (fr)
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EP1332285A1 (en
Inventor
Uwe Liskow
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1332285A1 publication Critical patent/EP1332285A1/en
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    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel 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

Definitions

  • the invention relates to a fuel injection system for Injecting fuel into an internal combustion engine, especially for the direct injection of fuel into the Combustion chamber or the combustion chambers of the internal combustion engine.
  • the invention is based on a fuel injection system according to the genus of claim 1.
  • Such Fuel injection system is from DE 197 25 076 A1 known. It points to the sealing connection between one Fuel injector and an associated Connection piece of a fuel distribution line in each case an annular seal carrier with a first Sealing element for sealing the seal carrier opposite an end face of an inlet section of the Fuel injector and with a second Sealing element for sealing the seal carrier opposite the connector of the fuel rail interacts.
  • One in a fuel inlet of the inlet section insertable socket penetrates the annular seal carrier, so that the Seal carrier between an upstream collar of the Socket and the inlet section of the fuel injector locked in a radial direction is.
  • a disadvantage of the in the above publication described arrangement is that through the socket additional component is required with low Tolerances. Since the radial mobility of the Seal carrier is only guaranteed if this is still one has some axial play and not against the bush the inlet section is pressed, the socket at the Installation with a precisely defined depth in the Fuel inlet opening can be used. This is a precisely manufactured cylinder surface of the bushing and one with a corresponding bore made as Fuel inlet opening necessary to ensure a tight fit of the Achieve jack, creating the game needed for the Seal carrier can be adjusted.
  • the fuel injection system according to the invention with the Features of claim 1 in contrast, the advantage that those used for sealing O-rings do not compensate for position and angle deviations have to compensate for a purely elastic deformation.
  • the O-rings are not deformed on one side.
  • Fuel injection system according to the invention over the The prior art has the advantage that the additional component the precise socket to be manufactured is saved. Further the fuel injector does not have to fit have manufactured inlet bore. This allows the Manufacturing costs of these parts reduced and the Manufacturing costs can be reduced accordingly.
  • first Sealing element in a first annular groove in one downstream, radially oriented end face of the Seal carrier is guided and on the end face of the Inlet section of the fuel injector radially is slidably movable.
  • first Sealing element in a first annular groove in the end face of the inlet section of the fuel injector is and on a downstream, radially oriented End face of the seal carrier can be moved in a radially sliding manner is.
  • the shape of the sealing element is simplified thereby.
  • the additional ring groove in the face of the Inlet section of the fuel injector is on the other hand, cheaper to manufacture, because in any case an accurate on components of the fuel injection valves Machining by turning is required.
  • the circlip on the Inlet section welded or in a groove of the Inlet section are kept. If the locking ring is in a groove is made, the manufacturing effort becomes significant simplified, since only when manufacturing the parts of the Fuel injector, which is always low Tolerances occur, pay attention to the position of this ring groove must become.
  • Fig. 1 shows an embodiment of the invention in a excerpt, cut representation. Is shown just the connection area between one Fuel injector 1 and a fuel rail 2.
  • the fuel rail 2 is only here Area of a connection piece 3 drawn.
  • the fuel injection valve 1 has an inlet section 4 with a guide section 5, which with the Inlet section 4 of the fuel injection valve 1 is molded in one piece.
  • An end face 6 is on the Inlet section 4 at the transition to the guide section 5 formed.
  • a seal carrier 9 is the Guide section 5 penetrated and between the inlet end face 6 of the inlet section 4 and one at the inlet end of the guide section 5 arranged, radially projecting locking ring 10 locked.
  • the locking ring 10 is on the Guide section 5 of the fuel injector 1 with an axial distance a shown for clarity arranged to the end face 6, so that the seal carrier 9 is slightly axially movable with a game b.
  • the Seal carrier 9 is therefore not between the Circlip 10 of the guide section 5 and the Inlet section 4 of the fuel injection valve 1 jammed, but in the radial direction within a Clarification also shown in the displacement range c radially movable.
  • the seal carrier 9 has at its downstream end one of the end face 6 of the inlet section 4 of the Fuel injector 1 opposite, radially aligned end face 11.
  • On the seal carrier 9 is a first circumferential annular groove 12 in the end face 11 trained in taking and managing a first Sealing element 13 in the form of an O-ring Sealing ring is used.
  • the first sealing element 13 serves as an axial seal and seals the seal carrier 9 compared to the inlet section 4 of the Fuel injector 1 from.
  • the first is Sealing element 13 on the end face 11 of the Inlet section 4 of the fuel injector 1 sliding movable.
  • the seal carrier 9 has on a wall 14 of the connecting piece 3 opposite surface 15 a second annular groove 16.
  • the second annular groove 16 is used Recording and guiding a second sealing element 17 in Form of a sealing ring designed as an O-ring.
  • the second sealing element 17 causes a radial seal and seals the seal carrier 9 against that Connection piece 3 from.
  • the second sealing element 17 is while sliding in the connecting piece 3.
  • the locking ring 10 can, if it is designed as an open ring, easily be assembled by using a suitable tool is spread and pushed over the guide section 5 becomes. Due to the internal stress of the locking ring 10 this is held in the annular groove 18. If the seal carrier 9 acted upon with the fuel pressure in the operating state is the target for the fuel pressure on the upstream side the entire upstream End face 6 of the seal carrier 9 up to its Outside diameter available. against that is Seal carrier 9 at its downstream end at best up to the first sealing element 13 the fuel pressure exposed because the radially outer area is sealed.
  • the seal carrier 9 is therefore with a effective, axial force component by the Fuel pressure applied to the seal carrier 9 in Direction on the fuel injector 1 presses.
  • the first sealing element 13 is therefore on the end face 6 of the inlet section 4 of the fuel injection valve 1 pressed so that there is a good sealing effect.
  • the annular seal carrier 9 advantageously enables both radial compensation and axial compensation Balance between the position of the inlet section 4 of the Fuel injector 1 and the position of the Connection piece 3.
  • the inlet section 4 of the Fuel injector 1 is like all parts of the Fuel injector 1 to manufacture exactly and can can be processed by turning.
  • the formation of a Guide section 5 with a recessed annular groove 18th represents a hardly significant additional effort. In particular, there is only one size, namely the distance a between the annular groove 18 and the end face 6 exactly observed. Compared to an additional component and one This means that the bore to be made to fit is significant Costs saved.
  • Fig. 2 shows another cheap embodiment of a Fuel injection system according to the invention in a excerpt, cut representation. Is shown as in Fig. 1 the connection area between one Fuel injector 19 and a fuel rail 20, of which only one connecting piece 21 is drawn is. The fuel injector 19 has one Inlet section 22, on the one piece Guide section 23 is formed.
  • An end face 24 is on the inlet section 22 on the Transition to the guide section 23 is formed.
  • the guide section 23 and the inlet section 22 penetrated by an inlet bore 26 for the fuel.
  • a seal carrier 27 is removed from the guide portion 23 penetrated and between the inlet-side end face 24 of the inlet section 22 and one at the inlet end of the guide section 23 arranged radially outward protruding locking ring 28 locked.
  • the Circlip 28 is shown in the example Embodiment by a circumferential weld 29 with the Guide section 23 connected.
  • the seal carrier 27 is due to the arrangement of the Circlip 28, corresponding to FIG. 1, not between the Circlip 28 of the guide portion 23 and the Inlet section 22 of fuel injector 19 jammed, but movable in the radial direction.
  • the Seal carrier 27 has one at its downstream end the end face 24 of the inlet section 22 of the Fuel injector 9 opposite, radially aligned end face 30.
  • first sealing element 32 in the form of a O-rings serves.
  • the first sealing element 32 seals the Seal carrier 27 slidably movable relative to the Inlet section 22 of the fuel injector 19.
  • the seal carrier 27 has one Wall 33 of the connecting piece 21 opposite The lateral surface 34 has a second annular groove 35.
  • the second Annular groove 35 becomes a second sealing element 36 in shape of an O-ring.
  • the second sealing element 36 seals the seal carrier radially and slidably 27 compared to the connecting piece 21.
  • This embodiment is particularly advantageous in that the seal carrier 27 is further simplified by the first annular groove 31 in the end face 24 of the Fuel injector 19 is located.
  • the first annular groove 31 is easier on the fuel injector 19 and less expensive to manufacture.
  • Fig. 3 shows a further embodiment of a Fuel injection system according to the invention in a detail corresponding to section III of Figure 1. Die Embodiment differs from that Fuel injection system 1 of FIG. 1 only in this Callout. Therefore, the same parts become the same Reference numerals used.
  • the seal carrier 9 is shown in section and shows the first annular groove 12 with the first sealing element 13.
  • the second sealing element 17 guided in the second annular groove 16 .
  • it is downstream of the second sealing element 17, which is designed as an O-ring is arranged, a support ring 37.
  • the inside diameter of the Support ring 37 is dimensioned so that it is not up to The reason of the second annular groove 16 is sufficient and therefore radial is mobile.
  • the outer diameter of the Seal carrier 9 are dimensioned smaller, and that Sealing element 17 can be exposed to larger angles of tilt without deforming inadmissibly.
  • seal carrier 9 Preferably upstream of the second Sealing element 17 out in the second annular groove 16 and an upper support ring with a larger outer diameter than the seal carrier 9 available.
  • the seal carrier 9 preferably instructs a radially circumferential at its upstream end conical bevel 38.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Brennstoffeinspritzanlage zum Einspritzen von Brennstoff in eine Brennkraftmaschine, insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum bzw. die Brennräume der Brennkraftmaschine.The invention relates to a fuel injection system for Injecting fuel into an internal combustion engine, especially for the direct injection of fuel into the Combustion chamber or the combustion chambers of the internal combustion engine.

Die Erfindung geht aus von einer Brennstoffeinspritzanlage nach der Gattung des Anspruchs 1. Eine solche Brennstoffeinspritzanlage ist aus der DE 197 25 076 A1 bekannt. Sie weist zur dichtenden Verbindung zwischen einem Brennstoffeinspritzventil und einem zugeordneten Verbindungsstutzen einer Brennstoffverteilerleitung jeweils einen ringförmigen Dichtungsträger auf, der mit einem ersten Dichtungselement zur Abdichtung des Dichtungsträgers gegenüber einer Stirnfläche eines Zulaufabschnitts des Brennstoffeinspritzventils und mit einem zweiten Dichtungselement zur Abdichtung des Dichtungsträgers gegenüber dem Verbindungsstutzen der Brennstoffverteilerleitung zusammenwirkt. Eine in eine BrennstoffEinlaßöffnung des Zulaufabschnitts einsetzbare Buchse durchdringt den ringförmigen Dichtungsträger, so daß der Dichtungsträger zwischen einem stromaufwärtigen Kragen der Buchse und dem Zulaufabschnitt des Brennstoff-Einspritzventils in radialer Richtung beweglich arretiert ist.The invention is based on a fuel injection system according to the genus of claim 1. Such Fuel injection system is from DE 197 25 076 A1 known. It points to the sealing connection between one Fuel injector and an associated Connection piece of a fuel distribution line in each case an annular seal carrier with a first Sealing element for sealing the seal carrier opposite an end face of an inlet section of the Fuel injector and with a second Sealing element for sealing the seal carrier opposite the connector of the fuel rail interacts. One in a fuel inlet of the inlet section insertable socket penetrates the annular seal carrier, so that the Seal carrier between an upstream collar of the Socket and the inlet section of the fuel injector locked in a radial direction is.

Nachteilig an der in der obengenannten Druckschrift beschriebenen Anordnung ist, daß durch die Buchse ein zusätzliches Bauteil erforderlich ist, das mit geringen Toleranzen zu fertigen ist. Da die radiale Beweglichkeit des Dichtungsträgers nur gewährleistet ist, wenn dieser noch ein gewisses axiales Spiel hat und nicht von der Buchse gegen den Zulaufabschnitt gepreßt wird, muß die Buchse bei der Montage mit einer genau definierten Tiefe in die Brennstoffeinlaßöffnung eingesetzt werden. Hierzu ist eine genau gefertigte Zylinderfläche der Buchse und eine mit einer entsprechenden Passung gefertigte Bohrung als Brennstoffeinlaßöffnung notwendig, um einen festen Sitz der Buchse zu erreichen, wodurch das benötigte Spiel für den Dichtungsträger eingestellt werden kann.A disadvantage of the in the above publication described arrangement is that through the socket additional component is required with low Tolerances. Since the radial mobility of the Seal carrier is only guaranteed if this is still one has some axial play and not against the bush the inlet section is pressed, the socket at the Installation with a precisely defined depth in the Fuel inlet opening can be used. This is a precisely manufactured cylinder surface of the bushing and one with a corresponding bore made as Fuel inlet opening necessary to ensure a tight fit of the Achieve jack, creating the game needed for the Seal carrier can be adjusted.

Es ist bereits aus der JP-OS 08-312503 bekannt, ein in eine Aufnahmebohrung einsetzbares Brennstoffeinspritzventil, das einen Zulaufabschnitt aufweist, durch einen O-Ring an diesem Zulaufabschnitt gegenüber einem Verbindungsstutzen einer Brennstoffverteilerleitung abzudichten. Dabei liegt der O-Ring an einer Innenwandung des Verbindungsstutzens dichtend an.It is already known from JP-OS 08-312503, one into one Location bore insertable fuel injector, the has an inlet section, through an O-ring on this Inlet section opposite a connecting piece Seal the fuel rail. Here lies the O-ring on an inner wall of the connector sealing.

Aufgrund der Fertigungstoleranzen sowohl der Aufnahmebohrung für das Brennstoffeinspritzventil als auch des Verbindungsstutzens an der Brennstoffverteilerleitung kommt es zu Positionsabweichungen und Winkelabweichungen zwischen dem Zulaufabschnitt des Brennstoffeinspritzventils einerseits und dem Verbindungsstutzen der Brennstoffverteilerleitung andererseits. Der zwischen dem Zulaufabschnitt des Brennstoffeinspritzventils und dem Verbindungsstutzen der Brennstoff-Verteilerleitung angeordnete O-Ring gleicht die Positions- und Winkelabweichungen nur in einem sehr geringen, unzureichenden Umfang aus. Bei den in der Praxis auftretenden Positions- und Winkelabweichungen besteht bei der aus der JP-OS 08-312503 bekannten Brennstoffeinspritzanlage die Gefahr des Brennstoffaustritts an der die Positions- und Winkelabweichungen nicht hinreichend ausgleichenden Dichtung.Due to the manufacturing tolerances both the location hole for the fuel injector as well Connection piece comes on the fuel rail there are positional deviations and angular deviations between the inlet section of the fuel injector on the one hand and the connecting piece of the Fuel distribution line, on the other hand. The between that Inlet section of the fuel injector and the Connection piece of the fuel distribution line Arranged O-ring balances the position and Angular deviations only in a very small, insufficient scope. In practice There are deviations in position and angle at that known from JP-OS 08-312503 Fuel injection system the risk of fuel leakage where the position and angle deviations are not adequately balancing seal.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Brennstoffeinspritzanlage mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß die zur Dichtung dienenden O-Ringe die Positions- und Winkelabweichungen nicht durch eine rein elastiche Verformung ausgleichen müssen. Die O-Ringe werden nicht einseitig deformiert. Vor allem hat die erfindungsgemäße Brennstoffeinspritzanlage gegenüber dem Stand der Technik den Vorteil, daß das zusätzliche Bauteil der präziese zu fertigenden Buchse eingespart wird. Weiter muß das Brennstoffeinspritzventil keine auf Passung gefertigte Zulaufbohrung aufweisen. Dadurch können der Fertigungsaufwand dieser Teile verringert und die Fertigungskosten entsprechend reduziert werden.The fuel injection system according to the invention with the Features of claim 1 in contrast, the advantage that those used for sealing O-rings do not compensate for position and angle deviations have to compensate for a purely elastic deformation. The O-rings are not deformed on one side. Above all, it has Fuel injection system according to the invention over the The prior art has the advantage that the additional component the precise socket to be manufactured is saved. Further the fuel injector does not have to fit have manufactured inlet bore. This allows the Manufacturing costs of these parts reduced and the Manufacturing costs can be reduced accordingly.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der in dem Anspruch 1 angegebenen Brennstoffeinspritzanlage möglich.By the measures listed in the subclaims advantageous developments and improvements in the Claim 1 specified fuel injection system possible.

Es ist besonders vorteilhaft, wenn das erste Dichtungselement in einer ersten Ringnut in einer stromabwärtigen, radial ausgerichteten Stirnfläche des Dichtungsträgers geführt ist und auf der Stirnfläche des Zulaufabschnitts des Brennstoffeinspritzventils radial gleitend beweglich ist.It is particularly beneficial if the first Sealing element in a first annular groove in one downstream, radially oriented end face of the Seal carrier is guided and on the end face of the Inlet section of the fuel injector radially is slidably movable.

Besonders vorteilhaft ist es, wenn das erste Dichtungselement in einer ersten Ringnut in der Stirnfläche des Zulaufabschnitts des Brennstoffeinspritzventils geführt ist und auf einer stromabwärtigen, radial ausgerichteten Stirnfläche des Dichtungsträgers radial gleitend beweglich ist. Die Form des Dichtungselements vereinfacht sich dadurch. Die zusätzliche Ringnut in der Stirnfläche des Zulaufabschnitts des Brennstoffeinspritzventils ist demgegenüber kostengünstiger zu fertigen, da in jedem Fall an Bauteilen der Brennstoffeinspritzventile eine genaue Bearbeitung durch Drehen erforderlich ist.It is particularly advantageous if the first Sealing element in a first annular groove in the end face of the inlet section of the fuel injector is and on a downstream, radially oriented End face of the seal carrier can be moved in a radially sliding manner is. The shape of the sealing element is simplified thereby. The additional ring groove in the face of the Inlet section of the fuel injector is on the other hand, cheaper to manufacture, because in any case an accurate on components of the fuel injection valves Machining by turning is required.

Vorteilhaft ist es, wenn stromabwärts des zweiten Dichtungselements in der zweiten Ringnut geführt und radial frei beweglich ein unterer und/oder ein oberer Stützring mit einem größeren Außendurchmesser als der Dichtungsträger vorhanden ist. Dadurch können eine übermäßige Verformung des O-Rings und daraus resultierende Undichtigkeiten der Brennstoffeinspritzanlage verhindert werden.It is advantageous if downstream of the second Sealing element guided in the second annular groove and radially a lower and / or an upper support ring can move freely a larger outer diameter than the seal carrier is available. This can cause excessive deformation of the O-rings and resulting leaks in the Fuel injection system can be prevented.

Vorteilhaft einfach kann der Sicherungsring am Zulaufabschnitt angeschweißt oder in einer Nut des Zulaufabschnitts gehalten werden. Wenn der Sicherungsring in einer Nut geführt wird, wird der Fertigungsaufwand erheblich vereinfacht, da lediglich bei Fertigung der Teile des Brennstoffeinspritzventils, die in jedem Fall mit geringen Toleranzen erfolgt, auf die Position dieser Ringnut geachtet werden muß.The circlip on the Inlet section welded or in a groove of the Inlet section are kept. If the locking ring is in a groove is made, the manufacturing effort becomes significant simplified, since only when manufacturing the parts of the Fuel injector, which is always low Tolerances occur, pay attention to the position of this ring groove must become.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen Schnitt durch ein erfindungsgemäßes Ausführungsbeispiel in einer auszugsweisen Darstellung des Verbindungsbereichs zwischen dem Brennstoffeinspritzventil und der Brennstoffverteilerleitung,
Fig. 2
einen Schnitt durch ein weiteres erfindungsgemäßes Ausführungsbeispiel in einer auszugsweisen Darstellung des Verbindungsbereichs zwischen dem Brennstoffeinspritzventil und der Brennstoffverteilerleitung, und
Fig. 3
eine weitere Ausführungsform einer erfindungsgemäßen Brennstoffeinspritzanlage in einem Detail entsprechend dem Ausschnitt III der Fig. 1.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
3 shows a section through an exemplary embodiment according to the invention in a partial representation of the connection area between the fuel injection valve and the fuel distributor line,
Fig. 2
a section through another embodiment of the invention in a partial representation of the connection area between the fuel injector and the fuel rail, and
Fig. 3
a further embodiment of a fuel injection system according to the invention in a detail corresponding to section III of FIG. 1.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt ein Ausführungsbeispiel der Erfindung in einer auszugsweisen, geschnittenen Darstellung. Dargestellt ist lediglich der Verbindungsbereich zwischen einem Brennstoffeinspritzventil 1 und einer Brennstoffverteilerleitung 2. Die Brennstoffverteilerleitung 2 ist hier nur im Bereich eines Verbindungsstutzens 3 gezeichnet.Fig. 1 shows an embodiment of the invention in a excerpt, cut representation. Is shown just the connection area between one Fuel injector 1 and a fuel rail 2. The fuel rail 2 is only here Area of a connection piece 3 drawn.

Das Brennstoffeinspritzventil 1 weist einen Zulaufabschnitt 4 mit einem Führungsabschnitt 5 auf, der mit dem Zulaufabschnitt 4 des Brennstoffeinspritzventils 1 einstückig ausgeformt ist. Eine Stirnfläche 6 ist an dem Zulaufabschnitt 4 an dem Übergang zu dem Führungsabschnitt 5 ausgeformt. Entlang einer Mittelachse 7 des Brennstoffeinspritzventils 1 werden der Führungsabschnitt 5 und der Zulaufabschnitt 4 von einer Zulaufbohrung 8 für den Brennstoff durchdrungen. Ein Dichtungsträger 9 wird von dem Führungsabschnitt 5 durchdrungen und zwischen der zulaufseitigen Stirnfläche 6 des Zulaufabschnitts 4 und einem an dem zulaufseitigen Ende des Führungsabschnitts 5 angeordneten, radial nach außen überstehenden Sicherungsring 10 arretiert. Vorzugsweise ist der Sicherungsring 10 auf dem Führungsabschnitt 5 des Brennstoffeinspritzventils 1 mit einem zur Verdeutlichung eingezeichneten axialen Abstand a zu der Stirnfläche 6 angeordnet, so daß der Dichtungsträger 9 mit einem Spiel b geringfügig axial beweglich ist. Der Dichtungsträger 9 ist demnach nicht zwischen dem Sicherungsring 10 des Führungsabschnitts 5 und dem Zulaufabschnitt 4 des Brennstoffeinspritzventils 1 verklemmt, sondern in radialer Richtung innerhalb eines zur Verdeutlichung ebenfalls eingezeichneten Verschiebungsbereichs c radial beweglich.The fuel injection valve 1 has an inlet section 4 with a guide section 5, which with the Inlet section 4 of the fuel injection valve 1 is molded in one piece. An end face 6 is on the Inlet section 4 at the transition to the guide section 5 formed. Along a central axis 7 of the Fuel injection valve 1 becomes the guide section 5 and the inlet section 4 of an inlet bore 8 for the Penetrated fuel. A seal carrier 9 is the Guide section 5 penetrated and between the inlet end face 6 of the inlet section 4 and one at the inlet end of the guide section 5 arranged, radially projecting locking ring 10 locked. Preferably, the locking ring 10 is on the Guide section 5 of the fuel injector 1 with an axial distance a shown for clarity arranged to the end face 6, so that the seal carrier 9 is slightly axially movable with a game b. The Seal carrier 9 is therefore not between the Circlip 10 of the guide section 5 and the Inlet section 4 of the fuel injection valve 1 jammed, but in the radial direction within a Clarification also shown in the displacement range c radially movable.

Der Dichtungsträger 9 weist an seinem stromabwärtigen Ende eine der Stirnfläche 6 des Zulaufabschnitts 4 des Brennstoffeinspritzventils 1 gegenüberliegende, radial ausgerichtete Stirnfläche 11 auf. An dem Dichtungsträger 9 ist in der Stirnfläche 11 eine erste umlaufende Ringnut 12 ausgebildet, die der Aufnahme und Führung eines ersten Dichtungselements 13 in Form eines als O-Ring ausgebildeten Dichtungsrings dient. Das erste Dichtungselement 13 dient als axiale Abdichtung und dichtet den Dichtungsträger 9 gegenüber dem Zulaufabschnitt 4 des Brennstoffeinspritzventils 1 ab. Dabei ist das erste Dichtungselement 13 auf der Stirnfläche 11 des Zulaufabschnitts 4 des Brennstoffeinspritzventils 1 gleitend beweglich.The seal carrier 9 has at its downstream end one of the end face 6 of the inlet section 4 of the Fuel injector 1 opposite, radially aligned end face 11. On the seal carrier 9 is a first circumferential annular groove 12 in the end face 11 trained in taking and managing a first Sealing element 13 in the form of an O-ring Sealing ring is used. The first sealing element 13 serves as an axial seal and seals the seal carrier 9 compared to the inlet section 4 of the Fuel injector 1 from. The first is Sealing element 13 on the end face 11 of the Inlet section 4 of the fuel injector 1 sliding movable.

Ferner weist der Dichtungsträger 9 an einer einer Wandung 14 des Verbindungsstutzens 3 gegenüberliegenden Mantelfläche 15 eine zweite Ringnut 16 auf. Die zweite Ringnut 16 dient der Aufnahme und Führung eines zweiten Dichtungselements 17 in Form eines als O-Ring ausgebildeten Dichtungsrings. Das zweite Dichtungselement 17 bewirkt eine radiale Dichtung und dichtet den Dichtungsträger 9 gegenüber dem Verbindungsstutzen 3 ab. Das zweite Dichtungselement 17 ist dabei in dem Verbindungsstutzen 3 gleitend verschiebbar.Furthermore, the seal carrier 9 has on a wall 14 of the connecting piece 3 opposite surface 15 a second annular groove 16. The second annular groove 16 is used Recording and guiding a second sealing element 17 in Form of a sealing ring designed as an O-ring. The second sealing element 17 causes a radial seal and seals the seal carrier 9 against that Connection piece 3 from. The second sealing element 17 is while sliding in the connecting piece 3.

In einer vorteilhaften Ausführungsform ist der Sicherungsring 10 in einer Ringnut 18 in dem Führungsabschnitt 5 des Zulaufabschnitts 4 des Brennstoffeinspritzventils 1 eingesetzt. Der Sicherungsring 10 kann, wenn er als offener Ring ausgeführt ist, leicht montiert werden, indem er durch ein geeignetes Werkzeug aufgespreizt wird und über den Führungsabschnitt 5 geschoben wird. Durch die Eigenspannung des Sicherungsrings 10 wird dieser in der Ringnut 18 gehalten. Wenn der Dichtungsträger 9 im Betriebszustand mit dem Brennstoffdruck beaufschlagt wird, steht als Angriffsfläche für den Brennstoffdruck somit auf der stromaufwärtigen Seite die gesamte stromaufwärtige Stirnfläche 6 des Dichtungsträgers 9 bis zu seinem Außendurchmesser zur Verfügung. Dagegen ist der Dichtungsträger 9 an seinem stromabwärtigen Ende allenfalls bis zu dem ersten Dichtungselement 13 dem Brennstoffdruck ausgesetzt, da der radial weiter außen liegende Bereich abgedichtet ist. Der Dichtungsträger 9 wird daher mit einer effektiven, axialen Kraftkomponente durch den Brennstoffdruck beaufschlagt, die den Dichtungsträger 9 in Richtung auf das Brennstoffeinspritzventil 1 drückt. Das erste Dichtungselement 13 wird daher an die Stirnfläche 6 des Zulaufabschnitts 4 des Brennstoffeinspritzventils 1 angepreßt, so daß eine gute Dichtwirkung entsteht.In an advantageous embodiment, the Circlip 10 in an annular groove 18 in the Guide section 5 of the inlet section 4 of the Fuel injector 1 used. The locking ring 10 can, if it is designed as an open ring, easily be assembled by using a suitable tool is spread and pushed over the guide section 5 becomes. Due to the internal stress of the locking ring 10 this is held in the annular groove 18. If the seal carrier 9 acted upon with the fuel pressure in the operating state is the target for the fuel pressure on the upstream side the entire upstream End face 6 of the seal carrier 9 up to its Outside diameter available. Against that is Seal carrier 9 at its downstream end at best up to the first sealing element 13 the fuel pressure exposed because the radially outer area is sealed. The seal carrier 9 is therefore with a effective, axial force component by the Fuel pressure applied to the seal carrier 9 in Direction on the fuel injector 1 presses. The first sealing element 13 is therefore on the end face 6 of the inlet section 4 of the fuel injection valve 1 pressed so that there is a good sealing effect.

Vorteilhaft ermöglicht der ringförmige Dichtungsträger 9 sowohl einen radialen Ausgleich als auch einen axialen Ausgleich zwischen der Position des Zulaufabschnitts 4 des Brennstoffeinspritzventils 1 und der Position des Verbindungsstutzens 3. Insbesondere vorteilhaft ist die kostengünstige, gut zu fertigende Ausgestaltung der Bauteile. Der Zulaufabschnitt 4 des Brennstoffeinspritzventils 1 ist wie alle Teile des Brennstoffeinspritzventils 1 genau zu fertigen und kann durch Drehen bearbeitet werden. Die Ausformung eines Führungsabschnittes 5 mit einer eingestochenen Ringnut 18 stellt einen kaum ins Gewicht fallenden Mehraufwand dar. Insbesondere ist nur eine einzige Größe, nämlich der Abstand a zwischen der Ringnut 18 und der Stirnfläche 6 genau einzuhalten. Gegenüber einem zusätzlichen Bauteil und einer auf Passung zu fertigenden Bohrung werden dadurch erheblich Kosten eingespart. The annular seal carrier 9 advantageously enables both radial compensation and axial compensation Balance between the position of the inlet section 4 of the Fuel injector 1 and the position of the Connection piece 3. The is particularly advantageous inexpensive, easy to manufacture design of the Components. The inlet section 4 of the Fuel injector 1 is like all parts of the Fuel injector 1 to manufacture exactly and can can be processed by turning. The formation of a Guide section 5 with a recessed annular groove 18th represents a hardly significant additional effort. In particular, there is only one size, namely the distance a between the annular groove 18 and the end face 6 exactly observed. Compared to an additional component and one This means that the bore to be made to fit is significant Costs saved.

Fig. 2 zeigt eine weitere günstige Ausführungsform einer erfindungsgemäßen Brennstoffeinspritzanlage in einer auszugsweisen, geschnittenen Darstellung. Dargestellt ist wie in Fig. 1 der Verbindungsbereich zwischen einem Brennstoffeinspritzventil 19 und einer Brennstoffverteilerleitung 20, von der nur ein Verbindungsstutzen 21 gezeichnet ist. Das Brennstoffeinspritzventil 19 weist einen Zulaufabschnitt 22 auf, an dem einstückig ein Führungsabschnitt 23 ausgeformt ist.Fig. 2 shows another cheap embodiment of a Fuel injection system according to the invention in a excerpt, cut representation. Is shown as in Fig. 1 the connection area between one Fuel injector 19 and a fuel rail 20, of which only one connecting piece 21 is drawn is. The fuel injector 19 has one Inlet section 22, on the one piece Guide section 23 is formed.

Eine Stirnfläche 24 ist an dem Zulaufabschnitt 22 an dem Übergang zu dem Führungsabschnitt 23 ausgeformt. Entlang einer Mittelachse 25 des Brennstoffeinspritzventils 19 werden der Führungsabschnitt 23 und der Zulaufabschnitt 22 von einer Zulaufbohrung 26 für den Brennstoff durchdrungen. Ein Dichtungsträger 27 wird von dem Führungsabschnitt 23 durchdrungen und zwischen der zulaufseitigen Stirnfläche 24 des Zulaufabschnitts 22 und einem an dem zulaufseitigen Ende des Führungsabschnitts 23 angeordneten, radial nach außen überstehenden Sicherungsring 28 arretiert. Der Sicherungsring 28 wird in der beispielhaft dargestellten Ausführungsform durch eine umlaufende Schweißnaht 29 mit dem Führungsabschnitt 23 verbunden.An end face 24 is on the inlet section 22 on the Transition to the guide section 23 is formed. Along a central axis 25 of the fuel injection valve 19 the guide section 23 and the inlet section 22 penetrated by an inlet bore 26 for the fuel. A seal carrier 27 is removed from the guide portion 23 penetrated and between the inlet-side end face 24 of the inlet section 22 and one at the inlet end of the guide section 23 arranged radially outward protruding locking ring 28 locked. The Circlip 28 is shown in the example Embodiment by a circumferential weld 29 with the Guide section 23 connected.

Der Dichtungsträger 27 ist durch die Anordnung des Sicherungsrings 28, entsprechend Fig. 1, nicht zwischen dem Sicherungsring 28 des Führungsabschnitts 23 und dem Zulaufabschnitt 22 des Brennstoffeinspritzventils 19 verklemmt, sondern in radialer Richtung beweglich. Der Dichtungsträger 27 weist an seinem stromabwärtigen Ende eine der Stirnfläche 24 des Zulaufabschnitts 22 des Brennstoffeinspritzventils 9 gegenüberliegende, radial ausgerichtete Stirnfläche 30 auf.The seal carrier 27 is due to the arrangement of the Circlip 28, corresponding to FIG. 1, not between the Circlip 28 of the guide portion 23 and the Inlet section 22 of fuel injector 19 jammed, but movable in the radial direction. The Seal carrier 27 has one at its downstream end the end face 24 of the inlet section 22 of the Fuel injector 9 opposite, radially aligned end face 30.

In der Stirnfläche 24 des Zulaufabschnitts 22 ist eine erste umlaufende Ringnut 31 ausgebildet, die der Aufnahme und Führung eines ersten Dichtungselements 32 in Form eines O-Rings dient. Das erste Dichtungselement 32 dichtet den Dichtungsträger 27 gleitend beweglich gegenüber dem Zulaufabschnitt 22 des Brennstoffeinspritzventils 19 ab.In the end face 24 of the inlet section 22 there is a first one circumferential annular groove 31 formed, the receiving and Guide a first sealing element 32 in the form of a O-rings serves. The first sealing element 32 seals the Seal carrier 27 slidably movable relative to the Inlet section 22 of the fuel injector 19.

Weiterhin weist der Dichtungsträger 27 an einer einer Wandung 33 des Verbindungsstutzens 21 gegenüberliegenden Mantelfläche 34 eine zweite Ringnut 35 auf. In der zweiten Ringnut 35 wird ein zweites Dichtungselement 36 in Form eines O-Rings geführt. Das zweite Dichtungselement 36 dichtet radial und gleitend verschiebbar den Dichtungsträger 27 gegenüber dem Verbindungsstutzen 21 ab.Furthermore, the seal carrier 27 has one Wall 33 of the connecting piece 21 opposite The lateral surface 34 has a second annular groove 35. In the second Annular groove 35 becomes a second sealing element 36 in shape of an O-ring. The second sealing element 36 seals the seal carrier radially and slidably 27 compared to the connecting piece 21.

Vorteilhaft an dieser Ausführungsform ist insbesondere, daß der Dichtungsträger 27 weiter vereinfacht ist, indem die erste Ringnut 31 in der Stirnfläche 24 des Brennstoffeinspritzventils 19 liegt. Die erste Ringnut 31 ist an dem Brennstoffeinspritzventil 19 einfacher und kostengünstiger zu fertigen. Die Funktionsweise wird dadurch, daß das erste Dichtungselement 32 nicht in der Stirnfläche 30 des Dichtungsträgers 27, sondern in der Stirnfläche 24 des Zulaufabschnitts 22 des Brennstoffeinspritzventils 19 liegt, in keiner Weise beeinträchtigt.This embodiment is particularly advantageous in that the seal carrier 27 is further simplified by the first annular groove 31 in the end face 24 of the Fuel injector 19 is located. The first annular groove 31 is easier on the fuel injector 19 and less expensive to manufacture. The way it works in that the first sealing element 32 is not in the End face 30 of the seal carrier 27, but in the End face 24 of the inlet section 22 of the Fuel injector 19 is in no way impaired.

Fig. 3 zeigt eine weitere Ausführungsform einer erfindungsgemäßen Brennstoffeinspritzanlage in einem Detail entsprechend dem Ausschnitt III der Figur 1. Die Ausführungsform unterscheidet sich von der Brennstoffeinspritzanlage 1 der Fig. 1 nur in diesem Detailausschnitt. Deshalb werden für gleiche Teile dieselben Bezugszeichen verwendet.Fig. 3 shows a further embodiment of a Fuel injection system according to the invention in a detail corresponding to section III of Figure 1. Die Embodiment differs from that Fuel injection system 1 of FIG. 1 only in this Callout. Therefore, the same parts become the same Reference numerals used.

Der Dichtungsträger 9 ist geschnitten dargestellt und zeigt die erste Ringnut 12 mit dem ersten Dichtungselement 13. In der zweiten Ringnut 16 ist das zweite Dichtungselement 17 geführt. In einer günstigen Ausführungsform ist stromabwärts des zweiten Dichtungselements 17, der als O-Ring ausgebildet ist, ein Stützring 37 angeordnet. Der Innendurchmesser des Stützrings 37 ist so bemessen, daß dieser nicht bis in den Grund der zweiten Ringnut 16 reicht und folglich radial beweglich ist.The seal carrier 9 is shown in section and shows the first annular groove 12 with the first sealing element 13. In the second annular groove 16 is the second sealing element 17 guided. In a favorable embodiment it is downstream of the second sealing element 17, which is designed as an O-ring is arranged, a support ring 37. The inside diameter of the Support ring 37 is dimensioned so that it is not up to The reason of the second annular groove 16 is sufficient and therefore radial is mobile.

Durch diese Ausgestaltung kann der Außendurchmesser des Dichtungsträgers 9 kleiner bemessen werden, und das Dichtungselement 17 kann größeren Verkippwinkeln ausgesetzt werden, ohne sich unzulässig zu verformen.With this configuration, the outer diameter of the Seal carrier 9 are dimensioned smaller, and that Sealing element 17 can be exposed to larger angles of tilt without deforming inadmissibly.

Vorzugsweise ist stromaufwärts des zweiten Dichtungselementes 17 in der zweiten Ringnut 16 geführt und radial frei beweglich ein oberer Stützring mit einem größeren Außendurchmesser als der Dichtungsträger 9 vorhanden. Der Dichtungsträger 9 weist vorzugsweise an seinem stromaufwärtigen Ende eine radial umfängliche kegelförmige Anschrägung 38 auf.Preferably upstream of the second Sealing element 17 out in the second annular groove 16 and an upper support ring with a larger outer diameter than the seal carrier 9 available. The seal carrier 9 preferably instructs a radially circumferential at its upstream end conical bevel 38.

Claims (11)

  1. Fuel injection system for injecting fuel into an internal combustion engine, having at least one fuel injection valve (1, 19), which has an inflow section (4, 22), and a fuel distributor line (2, 20), which has, for each fuel injection valve (1, 19), a connecting piece (3, 21) which can be connected to the inlet section (4, 22) of the fuel injection valve (1, 19), an annular seal carrier (9, 27) being provided in each case for the sealing connection of the inlet section (4, 22) of each fuel injection valve (1, 19) to the associated connecting piece (3, 21) of the fuel distributor line (2, 20), said annular seal carrier (9, 27) interacting with a first seal element (13, 32) for sealing off the seal carrier (9, 27) with respect to an end face (6, 24) of the inlet section (4, 22) of the fuel injection valve (1, 19) and with a second seal element (17, 36) for sealing off the seal carrier (9, 27) with respect to the connecting piece (3, 21) of the fuel distributor line (1, 19), characterized in that a guide section (5, 23) of the inlet section (4, 22) penetrates the seal carrier (9, 27), and in that a securing ring (10, 28) is provided on the inlet section (4, 22) upstream of the seal carrier (9, 27), so that the seal carrier (9, 27) is retained such that it can move in the radial direction between the securing ring (10, 28) and the end face (6, 24) of the inlet section (4, 22).
  2. Fuel injection system according to Claim 1, characterized in that the first seal element (13) is guided in a first annular groove (12) in a downstream, radially oriented end face (11) of the seal carrier (9) and is slidably movable radially on the end face (6) of the inlet section (4) of the fuel injection valve (1).
  3. Fuel injection system according to Claim 1, characterized in that the first seal element (32) is guided in a first annular grove (31) in the end face (24) of the inlet section (22) of the fuel injection valve (19) and is slidably movable radially on a downstream, radially oriented end face (30) of the seal carrier (27).
  4. Fuel injection system according to one of Claims 1 to 3, characterized in that a gap (b) remains between the end face (6, 24) of the inlet section (4, 22) and the end face (11, 30) of the seal carrier (9, 27) as a result of the arrangement of the securing ring (10, 28) and the elasticity of the first seal element (13, 32), even when acted upon by pressurized fuel.
  5. Fuel injection system according to one of Claims 1 to 4, characterized in that the second seal element (17, 36) is guided in a second annular groove (16, 35) of an axially oriented peripheral surface (15, 34) of the seal carrier (9, 27) and is slidably movable axially on a wall (14, 33) of the connecting piece (3, 21) of the fuel distributor line (2, 20).
  6. Fuel injection system according to Claim 5, characterized in that a lower supporting ring (37) having a greater outer diameter than the seal carrier (9) is present downstream of the second seal element (17) in a manner which is guided in the second annular groove (16) and is freely movable radially.
  7. Fuel injection system according to Claim 5 or 6, characterized in that an upper supporting ring having a greater outer diameter than the seal carrier (9) is present upstream of the second seal element (17) in a manner which is guided in the second annular groove (16) and is freely movable radially.
  8. Fuel injection system according to one of Claims 1 to 7, characterized in that the seal carrier (9) has a radially peripheral conical chamfer (38) at its downstream end.
  9. Fuel injection system according to one of Claims 1 to 8, characterized in that the securing ring (28) is welded to the inlet section (22).
  10. Fuel injection system according to one of Claims 1 to 8, characterized in that the securing ring (10) is held in a groove (18) of the inlet section (4).
  11. Fuel injection system according to one of Claims 1 to 10, characterized in that the seal elements (13, 17, 32, 36) are configured as encircling annular seals.
EP01993764A 2000-11-11 2001-11-12 Fuel injection system Expired - Lifetime EP1332285B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10056038 2000-11-11
DE10056038A DE10056038A1 (en) 2000-11-11 2000-11-11 Fuel injection system has seals ring-grooved for movement at seal support endfaces plus upstream safety ring to reinforce operational sealing.
PCT/DE2001/004207 WO2002038950A1 (en) 2000-11-11 2001-11-12 Fuel injection system

Publications (2)

Publication Number Publication Date
EP1332285A1 EP1332285A1 (en) 2003-08-06
EP1332285B1 true EP1332285B1 (en) 2004-06-16

Family

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EP01993764A Expired - Lifetime EP1332285B1 (en) 2000-11-11 2001-11-12 Fuel injection system

Country Status (5)

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US (1) US7195003B2 (en)
EP (1) EP1332285B1 (en)
JP (1) JP4092197B2 (en)
DE (2) DE10056038A1 (en)
WO (1) WO2002038950A1 (en)

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Also Published As

Publication number Publication date
DE10056038A1 (en) 2002-05-16
JP2004513298A (en) 2004-04-30
US20050115546A1 (en) 2005-06-02
JP4092197B2 (en) 2008-05-28
DE50102634D1 (en) 2004-07-22
WO2002038950A1 (en) 2002-05-16
EP1332285A1 (en) 2003-08-06
US7195003B2 (en) 2007-03-27

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