EP1671029B1 - Fuel injection device, especially for a direct injection internal combustion engine - Google Patents

Fuel injection device, especially for a direct injection internal combustion engine Download PDF

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Publication number
EP1671029B1
EP1671029B1 EP04762588A EP04762588A EP1671029B1 EP 1671029 B1 EP1671029 B1 EP 1671029B1 EP 04762588 A EP04762588 A EP 04762588A EP 04762588 A EP04762588 A EP 04762588A EP 1671029 B1 EP1671029 B1 EP 1671029B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection device
valve element
wall
housing
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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 - Fee Related
Application number
EP04762588A
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German (de)
French (fr)
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EP1671029A2 (en
Inventor
Siegfried Ruthardt
Holger Rapp
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1671029A2 publication Critical patent/EP1671029A2/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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the invention relates to a fuel injection device according to the preamble of claim 1.
  • a fuel injection device is known with a nozzle body in which a longitudinal bore is present.
  • the valve element is "stroke-controlled", that is, it has, at its end facing away from a combustion chamber in the installed position on a control surface which limits a hydraulic control chamber. If a high pressure prevails in the hydraulic control chamber, the valve element is pressed into its closed position. In the event of a pressure drop, the valve element can be opened by an admission device acting in the opening direction.
  • the control chamber is bounded radially outwardly by a sleeve part, which is pushed fluid-tightly onto an end region of the valve element and is pressed by a spring against a housing part lying opposite the control surface.
  • valve element When in the DE 101 22 256 A1 shown fuel injector, the valve element is approximately in his axial center on a guide portion which cooperates with a corresponding guide portion of the longitudinal bore in the housing. As a result, the valve element is guided relative to the housing and prevents it from tilting during operation relative to the longitudinal axis of the housing. In order to avoid tensioning of the valve element, the sleeve part at the end, which limits the control chamber radially, is not radially fixed relative to the recess in the housing.
  • the US 5,842,640 shows a fuel injection device in which the sleeve part as well as wide areas of the valve element are accommodated in the housing without radial play.
  • di GB 809,044 describes a fuel injection device with a thick-walled tubular housing insert, in which the valve element is accommodated.
  • the present invention has the object, a fuel injection device of the type mentioned in such a way that they can be produced as inexpensively.
  • the alignment means By the alignment means the radial position and axial orientation of the sleeve part is clearly defined. Therefore, it can very well form the only guide for the valve element.
  • the costly and expensive production of guide surfaces in the wall of the housing recess can therefore be dispensed with in the fuel injection device according to the invention. This is therefore relatively inexpensive.
  • the sleeve part according to the invention has a dual function: In addition to the leadership of the valve element, it also serves to the radial delimitation of the control chamber and to seal the control chamber with respect to the counter element.
  • the corresponding fuel injection device therefore builds comparatively compact.
  • the alignment means comprise at least one circumferential wall on the sleeve part, which rests against the wall of the housing recess.
  • the sleeve part is more or less a fitting ring, which is pressed into the housing recess, for example. This is very simple, robust and inexpensive.
  • the alignment means has a plurality of radially extending webs, which abut each with its projecting end on the wall of the housing recess. By such webs free spaces are automatically formed between the webs, which may for example be part of a fluid connection from a high-pressure port to the fuel outlet channel. This facilitates and simplifies the flow guidance in the fuel injection device according to the invention.
  • the existing between the webs free spaces are dimensioned so that a desired throttling effect is achieved.
  • the sleeve part has in this advantageous embodiment, therefore, a double function, because it also serves to tune the dynamics of the valve member in its opening and closing operation.
  • the alignment means comprise a conical recess in the wall of the counter element in the region of the housing recess, such that the sleeve part is centered by the conical recess.
  • the sleeve part can be aligned with respect to the housing recess, without that angle error between the wall of the counter-element and the orientation of the housing recess play a role. This simplifies the production and reduces the manufacturing costs of the fuel injection device according to the invention.
  • the reliability in operation of the fuel injection device according to the invention is increased, since the sealing of the control chamber is ensured even with such angle errors.
  • the correct alignment of the housing and the counter element to each other by simple and conventional measures, such as dowel pins, a centering, or the like.
  • the alignment means comprise an overall conical and the control surface opposite wall of the mating member and a complementary thereto corresponding housing wall, such that the sleeve part and the housing are centered by the conical wall.
  • the centering of the sleeve member relative to the housing is automatically ensured, without any contact between the sleeve part and the housing or other alignment means for aligning the counter element relative to the housing are required.
  • the assembly of such a fuel injection device is very simple.
  • the wall of the counter element is conically concave. In principle, however, it is also conceivable that this wall is configured conically convex. In both cases, the wall can be made very easily and ensures a good centering of the sleeve part.
  • the invention provides that in a preferred embodiment of the fuel injection device, the valve element has a guide portion which is guided in the sleeve part and has a larger diameter than an area the valve member around which the biasing means is arranged. In this way, a contact between the biasing means and the valve member, which would cause a sliding friction in the operation of the fuel injection device avoided. This allows even better and more accurate fuel injection.
  • a fuel system of an internal combustion engine as a whole carries the reference numeral 10. It comprises a fuel tank 12, from which a delivery system 14 delivers the fuel to a fuel rail ("rail") 16.
  • the conveyor system 14 may include, for example, a prefeed pump and a high pressure pump.
  • the fuel injection device 18 has a high-pressure port 20.
  • the fuel injection device 18 is associated with a combustion chamber 22, in which it injects the fuel directly.
  • a return line 24 leads back to the fuel tank 12.
  • the return line 24 is connected to the fuel injection device 18 at a low pressure port 26.
  • the fuel injection device 18 includes a housing 28 in which a longitudinally extending housing recess 30 is present.
  • the housing 28 is also referred to as a "nozzle body".
  • distributed fuel outlet channels 32 are arranged distributed over the circumference, via which fuel can pass from the housing recess 30 into the combustion chamber 22.
  • the housing recess 30 comprises a bottom in FIG. 2 lower and end tapered portion 30 a and an upper portion 30 b, which has a larger diameter than the section 30a has.
  • a sleeve part 34 is inserted in the upper portion 30 a of the housing recess 30 in the upper portion 30 a of the housing recess 30, a sleeve part 34 is inserted.
  • this sleeve part 34 has a continuous and radially inner guide section 36, a tapered sealing section 37 and a plurality of webs 38 distributed radially outward over the circumference of the guide section 36.
  • the webs 38 are arranged offset slightly downwards relative to the guide section 36.
  • the webs 38 are formed by semicircular spaces 40 which are present between the webs 38.
  • the radially projecting end surfaces 42 of the webs 38 lie on a common cylindrical surface, which corresponds approximately to the lateral surface of the upper portion 30b of the housing recess 30. In this way, the sleeve member 34 is radially fixed relative to the housing recess 30 and centered.
  • the sleeve part 34 has a central continuous guide bore 44. This cooperates with a guide portion 46 of a valve element 48, which is guided in this way in the sleeve part 34 and so in the housing recess 30 in the axial direction movable, but held immovable in the radial direction.
  • a portion 50 which has a smaller diameter than the guide section 46, adjoins the guide section 46 toward the lower end of the valve element 48 in FIG. 2.
  • the section 50 of the valve element points just above the transition from the section 30a to the section 30b of the housing recess 30 48 a circumferential collar 52. Between this collar 52 and the guide portion 36 of the sleeve member 34, a helical compression spring 54 is clamped.
  • the fuel injection device 18 comprises a plate-shaped counter element 56. This is fixed in a manner not shown in Figure 2 on the housing 28. It has a flat wall surface 58 towards the housing 28. Against this, the sleeve part 34 is acted upon by the helical compression spring 54. Between the wall surface 58, the sleeve part 34, and the upper end surface of the valve element 58 in Figure 2, a hydraulic control chamber 60 is formed. Therefore, the upper end surface of the valve element 48 is also referred to as a control surface. It bears the reference numeral 62.
  • a first high-pressure channel 64 connects a high-pressure connection 66, which is located radially outside of the sleeve part 34 between the valve element 48 and the housing recess 30b, to the high-pressure connection 20.
  • An inlet channel 68 with an inlet throttle 70 leads from the high-pressure connection 20 to the control chamber 60 contains an outlet throttle 74 leads from the control chamber 60 to a control valve 76.
  • the control chamber 60 can be selectively connected to the low-pressure port 26 or separated from it.
  • the fuel injector 18 shown in Figs. 2 and 3 is assembled as follows:
  • valve element 48 is inserted into the housing recess 30 and the helical compression spring 54 is threaded onto the valve element 48. Then, the sleeve part 34 is pushed onto the guide portion 46 of the valve element 48 and in the portion 30 b of the housing recess 30th centered. Finally, the counter element 56 is attached to the housing 28.
  • the fuel injector 18 shown in FIGS. 2 and 3 is operated as follows:
  • the control valve 76 In the initial state, the control valve 76 is closed, and at the high pressure port 20 of the prevailing in the fuel rail 16 high pressure is applied. Thus, the corresponding high fuel pressure is also in the high-pressure passage 64 and in the high-pressure chamber 66. Also on a conical pressure surface 78, which is present at the lower end of the valve element 48 in FIG. 2, this high fuel pressure is present, so that there acts a hydraulic force acting in the opening direction. At the same time, the high pressure is also transmitted via the inlet channel 68 into the control chamber 60. Also in this there is therefore a high fuel pressure.
  • the hydraulic force acting on the control surface 62 in the closing direction is greater than that acting on the pressure surface 78 in the opening direction.
  • the valve element 48 is therefore pressed with a sealing edge 80 against a corresponding housing-side valve seat (without reference numerals). Fuel therefore can not escape through the fuel exit channels 32.
  • the control valve 76 is opened. Fuel can thus flow out of the control chamber 60 to the low pressure port 26 out.
  • the inlet throttle 70 and the outlet throttle 74 are coordinated so that the pressure in the control chamber 60 decreases in a certain way. If the hydraulic force acting on the control surface 62 in the closing direction falls below that in FIG Opening force acting on the pressure surface 78, lifts the sealing edge 80 from the housing-side valve seat, and the valve element 48 opens.
  • control valve 76 is closed again.
  • the pressure in the control chamber 60 increases and the valve element 48 comes with the sealing edge 80 in abutment against the housing-side valve seat.
  • the portion 50 of the valve element 48 in the region of the helical compression spring 54 is arranged, has a relatively small diameter, it can during the movement of the valve element 48 between the helical compression spring 54 and the valve element 48 to come to no sliding friction. Thus, a corresponding wear of the spring 54 and the valve member 48 is reduced or completely avoided. Since the valve element 48, as soon as the sealing edge 80 has lifted from the housing-side valve seat, is guided only over the guide portion 46 in the guide bore 44 of the sleeve member 34, a complex processing of the housing recess 30 for guiding the valve element 48 is not required.
  • the semicircular free spaces 40 between the webs 38 of the sleeve part 34 may be dimensioned such that a desired throttle effect from the high-pressure passage 64 to the fuel outlet channels 32 out occurs.
  • the helical compression spring 54 is completely dispensed with.
  • the sleeve part 34 is fitted in the housing recess 30 in the housing 28 in a press fit.
  • FIG. 1 An alternative embodiment of a fuel injection device is shown in FIG.
  • FIG. 2 An alternative embodiment of a fuel injection device is shown in FIG.
  • Figures 2 and 3 An alternative embodiment of a fuel injection device is shown in FIG.
  • the differences between the fuel injection device 18 shown in Figure 4 to the preceding relate to the configuration of the sleeve member 34 and the wall surface 58 of the throttle plate 56.
  • the sleeve member 34 has no webs, but only a guide portion 36 and the throttle plate 56 through a sealing portion 37.
  • the wall surface 58 has a conically concave recess 82 in the region of the housing recess 30.
  • the sealing portion 37 of the sleeve member 34 abuts against the throttle plate 56 in the region of this conical recess 82. In this way, the sleeve member 34 is centered with respect to the throttle plate 56 against which it is pressed by the helical compression spring 54.
  • the throttle plate 56 must be positioned very accurately relative to the housing 28, which is possible for example by means of dowel pins or a centering groove (both not shown).
  • FIG. 1 A further modified embodiment is shown in FIG. The above applies with regard to functionally equivalent elements and areas.
  • the wall surface 58 of the throttle plate 56 is formed as a whole conically concave.
  • An opposite housing surface 84 is complementary thereto, that is conical convex. In this way, can be dispensed with a special positioning of the throttle plate 56 relative to the housing 28, since these center virtually by themselves to each other.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Kraftstoff-Einspritzvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injection device according to the preamble of claim 1.

Aus der DE 101 22 256 A1 ist eine Kraftstoff-Einspritzvorrichtung mit einem Düsenkörper bekannt, in dem eine Längsbohrung vorhanden ist. In dieser wird ein langgestrecktes Ventilelement bereichsweise geführt. Das Ventilelement ist "hubgesteuert", das heißt, es weist an seinem in Einbaulage von einem Brennraum abgewandten Ende eine Steuerfläche auf, die einen hydraulischen Steuerraum begrenzt. Herrscht in dem hydraulischen Steuerraum ein hoher Druck, wird das Ventilelement in seine geschlossene Position gepresst. Bei einem Druckabfall kann das Ventilelement von einer in Öffnungsrichtung wirkenden Beaufschlagungseinrichtung geöffnet werden. Der Steuerraum wird nach radial außen von einem Hülsenteil begrenzt, welches fluiddicht auf einen Endbereich des Ventilelements aufgeschoben ist und von einer Feder gegen ein der Steuerfläche gegenüberliegendes Gehäuseteil gedrückt wird.From the DE 101 22 256 A1 a fuel injection device is known with a nozzle body in which a longitudinal bore is present. In this an elongated valve element is partially performed. The valve element is "stroke-controlled", that is, it has, at its end facing away from a combustion chamber in the installed position on a control surface which limits a hydraulic control chamber. If a high pressure prevails in the hydraulic control chamber, the valve element is pressed into its closed position. In the event of a pressure drop, the valve element can be opened by an admission device acting in the opening direction. The control chamber is bounded radially outwardly by a sleeve part, which is pushed fluid-tightly onto an end region of the valve element and is pressed by a spring against a housing part lying opposite the control surface.

Bei der in der DE 101 22 256 A1 gezeigten Kraftstoff-Einspritzvorrichtung weist das Ventilelement in etwa in seiner axialen Mitte einen Führungsabschnitt auf, welcher mit einem entsprechenden Führungsabschnitt der Längsbohrung im Gehäuse zusammenarbeitet. Hierdurch wird das Ventilelement gegenüber dem Gehäuse geführt und verhindert, dass es im Betrieb gegenüber der Längsachse des Gehäuses verkippt. Um Verspannungen des Ventilelements zu vermeiden, ist das endseitig vorhandene Hülsenteil, welches den Steuerraum radial begrenzt, gegenüber der Ausnehmung im Gehäuse radial nicht festgelegt.When in the DE 101 22 256 A1 shown fuel injector, the valve element is approximately in his axial center on a guide portion which cooperates with a corresponding guide portion of the longitudinal bore in the housing. As a result, the valve element is guided relative to the housing and prevents it from tilting during operation relative to the longitudinal axis of the housing. In order to avoid tensioning of the valve element, the sleeve part at the end, which limits the control chamber radially, is not radially fixed relative to the recess in the housing.

Die US 5,842,640 zeigt eine Kraftstoff-Einspritzvorrichtung, bei der das Hülsenteil ebenso wie weite Bereiche des Ventilelements im Gehäuse ohne radiales Spiel aufgenommen sind. Di GB 809,044 beschreibt eine Kraftstoff-Einspritzvorrichtung mit einem dickwandigen rohrartigen Gehäuseeinsatz, in dem das Ventilelement aufgenommen ist.The US 5,842,640 shows a fuel injection device in which the sleeve part as well as wide areas of the valve element are accommodated in the housing without radial play. di GB 809,044 describes a fuel injection device with a thick-walled tubular housing insert, in which the valve element is accommodated.

Die vorliegende Erfindung hat die Aufgabe, eine Kraftstoff-Einspritzvorrichtung der eingangs genannten Art so weiterzubilden, dass sie möglichst preiswert hergestellt werden kann.The present invention has the object, a fuel injection device of the type mentioned in such a way that they can be produced as inexpensively.

Diese Aufgabe wird durch eine Kraftstoff-Einspritzvorrichtung mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a fuel injection device having the features of claim 1.

Vorteile der ErfindungAdvantages of the invention

Durch die Ausrichtmittel wird die radiale Lage und axiale Ausrichtung des Hülsenteils eindeutig festgelegt. Daher kann es sehr gut die einzige Führung für das Ventilelement bilden. Auf die aufwendige und teure Herstellung von Führungsflächen in der Wand der Gehäuseausnehmung kann daher bei der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung verzichtet werden. Diese ist daher vergleichsweise preiswert.By the alignment means the radial position and axial orientation of the sleeve part is clearly defined. Therefore, it can very well form the only guide for the valve element. The costly and expensive production of guide surfaces in the wall of the housing recess can therefore be dispensed with in the fuel injection device according to the invention. This is therefore relatively inexpensive.

Das Hülsenteil verfügt erfindungsgemäß über eine Doppelfunktion: Neben der Führung des Ventilelements dient es zusätzlich zur radialen Abgrenzung des Steuerraums und zur Abdichtung des Steuerraums gegenüber dem Gegenelement. Die entsprechende Kraftstoff-Einspritzvorrichtung baut daher vergleichsweise kompakt.The sleeve part according to the invention has a dual function: In addition to the leadership of the valve element, it also serves to the radial delimitation of the control chamber and to seal the control chamber with respect to the counter element. The corresponding fuel injection device therefore builds comparatively compact.

Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben.Advantageous developments of the invention are specified in subclaims.

Zunächst wird vorgeschlagen, dass die Ausrichtmittel mindestens eine Umfangswand am Hülsenteil umfassen, welche an der Wand der Gehäuseausnehmung anliegt. Bei dieser besonders einfachen Ausgestaltung der Ausrichtmittel handelt es sich bei dem Hülsenteil mehr oder weniger um einen Passring, der in die Gehäuseausnehmung beispielsweise eingepresst ist. Dies ist besonders einfach, robust und preiswert.First, it is proposed that the alignment means comprise at least one circumferential wall on the sleeve part, which rests against the wall of the housing recess. In this particularly simple embodiment of the alignment means, the sleeve part is more or less a fitting ring, which is pressed into the housing recess, for example. This is very simple, robust and inexpensive.

Möglich ist auch, dass die Ausrichtmittel eine Mehrzahl von sich radial erstreckenden Stegen aufweist, die jeweils mit ihrem abragenden Ende an der Wand der Gehäuseausnehmung anliegen. Durch derartige Stege werden automatisch zwischen den Stegen Freiräume gebildet, welche beispielsweise Teil einer Fluidverbindung von einem Hochdruckanschluss zu dem Kraftstoff-Austrittskanal sein können. Dies erleichtert und vereinfacht die Strömungsführung in der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung.It is also possible that the alignment means has a plurality of radially extending webs, which abut each with its projecting end on the wall of the housing recess. By such webs free spaces are automatically formed between the webs, which may for example be part of a fluid connection from a high-pressure port to the fuel outlet channel. This facilitates and simplifies the flow guidance in the fuel injection device according to the invention.

In Weiterbildung hierzu wird vorgeschlagen, dass die zwischen den Stegen vorhandenen Freiräume so dimensioniert sind, dass eine gewünschte Drosselwirkung erzielt wird. Das Hülsenteil hat bei dieser vorteilhaften Ausgestaltung also eine Doppelfunktion, denn es dient auch zur Abstimmung der Dynamik des Ventilelements bei dessen Öffnungs- und Schließvorgang.In a further development, it is proposed that the existing between the webs free spaces are dimensioned so that a desired throttling effect is achieved. The sleeve part has in this advantageous embodiment, therefore, a double function, because it also serves to tune the dynamics of the valve member in its opening and closing operation.

Wenn bei einer solchen Kraftstoff-Einspritzvorrichtung die weiter oben genannten Stege vorhanden sind, ist es vorteilhaft, wenn diese Stege axial vom Steuerraum weg versetzt angeordnet sind. Dies gestattet zusätzliche Freiheiten bei der Gestaltung des unmittelbar an die Wand des Gegenelements angrenzenden Bereichs der Gehäuseausnehmung.If in such a fuel injection device, the above-mentioned webs are present, it is advantageous if these webs are arranged offset axially away from the control chamber. This allows additional freedom in the design of the immediately adjacent to the wall of the mating member portion of the housing recess.

Eine weitere besonders bevorzugte Ausgestaltung der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung sieht vor, dass die Ausrichtmittel eine konische Ausnehmung in der Wand des Gegenelements im Bereich der Gehäuseausnehmung umfassen, derart, dass das Hülsenteil durch die konische Ausnehmung zentriert wird. Auf diese Weise kann das Hülsenteil gegenüber der Gehäuseausnehmung ausgerichtet werden, ohne dass Winkelfehler zwischen der Wand des Gegenelements und der Ausrichtung der Gehäuseausnehmung eine Rolle spielen. Dies vereinfacht die Fertigung und senkt die Herstellkosten der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung. Gleichzeitig wird die Zuverlässigkeit im Betrieb der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung erhöht, da die Abdichtung des Steuerraums auch bei derartigen Winkelfehlern gewährleistet ist. Die korrekte Ausrichtung des Gehäuses und des Gegenelements zueinander erfolgt durch einfache und übliche Maßnahmen, beispielsweise Spannstifte, eine Zentriernut, oder Ähnliches.Another particularly preferred embodiment of the fuel injection device according to the invention provides that the alignment means comprise a conical recess in the wall of the counter element in the region of the housing recess, such that the sleeve part is centered by the conical recess. In this way, the sleeve part can be aligned with respect to the housing recess, without that angle error between the wall of the counter-element and the orientation of the housing recess play a role. This simplifies the production and reduces the manufacturing costs of the fuel injection device according to the invention. At the same time, the reliability in operation of the fuel injection device according to the invention is increased, since the sealing of the control chamber is ensured even with such angle errors. The correct alignment of the housing and the counter element to each other by simple and conventional measures, such as dowel pins, a centering, or the like.

Alternativ ist es auch möglich, dass die Ausrichtmittel eine insgesamt konische und der Steuerfläche gegenüberliegende Wand des Gegenelements und eine hierzu komplementäre entsprechende Gehäusewand umfassen, derart, dass das Hülsenteil und das Gehäuse durch die konische Wand zentriert werden. Auf diese Weise wird automatisch auch die Zentrierung des Hülsenteils gegenüber dem Gehäuse sichergestellt, ohne dass ein Kontakt zwischen dem Hülsenteil und dem Gehäuse oder sonstige Ausrichtmittel zur Ausrichtung des Gegenelements gegenüber dem Gehäuse erforderlich sind. Insbesondere der Zusammenbau einer solchen Kraftstoff-Einspritzvorrichtung ist sehr einfach.Alternatively, it is also possible that the alignment means comprise an overall conical and the control surface opposite wall of the mating member and a complementary thereto corresponding housing wall, such that the sleeve part and the housing are centered by the conical wall. In this way, the centering of the sleeve member relative to the housing is automatically ensured, without any contact between the sleeve part and the housing or other alignment means for aligning the counter element relative to the housing are required. In particular, the assembly of such a fuel injection device is very simple.

Dabei ist es möglich, dass die Wand des Gegenelements konisch konkav ist. Grundsätzlich ist aber auch denkbar, dass diese Wand konisch konvex ausgestaltet ist. In beiden Fällen kann die Wand sehr einfach hergestellt werden und sorgt für eine gute Zentrierung des Hülsenteils.It is possible that the wall of the counter element is conically concave. In principle, however, it is also conceivable that this wall is configured conically convex. In both cases, the wall can be made very easily and ensures a good centering of the sleeve part.

Ferner ist erfindungsgemäß vorgesehen, dass bei einer bevorzugten Ausgestaltung der Kraftstoff-Einspritzvorrichtung das Ventilelement einen Führungsabschnitt aufweist, der in dem Hülsenteil geführt ist und einen größeren Durchmesser aufweist als ein Bereich des Ventilelements, um den herum die Vorspanneinrichtung angeordnet ist. Auf diese Weise wird ein Kontakt zwischen der Vorspanneinrichtung und dem Ventilelement, der eine Gleitreibung im Betrieb der Kraftstoff-Einspritzvorrichtung verursachen würde, vermieden. Dies gestattet eine nochmals bessere und genauere Kraftstoffeinspritzung.Further, the invention provides that in a preferred embodiment of the fuel injection device, the valve element has a guide portion which is guided in the sleeve part and has a larger diameter than an area the valve member around which the biasing means is arranged. In this way, a contact between the biasing means and the valve member, which would cause a sliding friction in the operation of the fuel injection device avoided. This allows even better and more accurate fuel injection.

Zeichnungdrawing

Nachfolgend werden besonders bevorzugte Ausführungsbeispiele der vorliegenden Erfindung unter Bezugnahme auf die beiliegende Zeichnung näher erläutert. In der Zeichnung zeigen:

Figur 1
eine schematische Darstellung eines Kraftstoffsystems einer Brennkraftmaschine mit einer Kraftstoff-Einspritzvorrichtung;
Figur 2
einen Teilschnitt durch ein erstes Ausführungsbeispiel der Kraftstoff-Einspritzvorrichtung von Figur 1;
Figur 3
einen Schnitt längs der Linie III-III von Figur 2;
Figur 4
einen Teilschnitt ähnlich Figur 2 eines zweiten Ausführungsbeispiels; und
Figur 5
einen Teilschnitt ähnlich Figur 2 eines dritten Ausführungsbeispiels.
Hereinafter, particularly preferred embodiments of the present invention will be explained in more detail with reference to the accompanying drawings. In the drawing show:
FIG. 1
a schematic representation of a fuel system of an internal combustion engine with a fuel injection device;
FIG. 2
a partial section through a first embodiment of the fuel injection device of Figure 1;
FIG. 3
a section along the line III-III of Figure 2;
FIG. 4
a partial section similar to Figure 2 of a second embodiment; and
FIG. 5
a partial section similar to Figure 2 of a third embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Figur 1 trägt ein Kraftstoffsystem einer Brennkraftmaschine insgesamt das Bezugszeichen 10. Es umfasst einen Kraftstoffbehälter 12, aus dem ein Fördersystem 14 den Kraftstoff zu einer Kraftstoff-Sammelleitung ("Rail") 16 fördert. Das Fördersystem 14 kann beispielsweise eine Vorförderpumpe und eine Hochdruckpumpe umfassen.In FIG. 1, a fuel system of an internal combustion engine as a whole carries the reference numeral 10. It comprises a fuel tank 12, from which a delivery system 14 delivers the fuel to a fuel rail ("rail") 16. The conveyor system 14 may include, for example, a prefeed pump and a high pressure pump.

An die Kraftstoff-Sammelleitung 16 sind mehrere Kraftstoff-Einspritzvorrichtungen 18 angeschlossen, von denen in Figur 1 nur eine dargestellt ist. Hierzu verfügt die Kraftstoff-Einspritzvorrichtung 18 über einen Hochdruckanschluss 20. Die Kraftstoff-Einspritzvorrichtung 18 ist einem Brennraum 22 zugeordnet, in den sie den Kraftstoff direkt einspritzt. Von der Kraftstoff-Einspritzvorrichtung 18 führt eine Rücklaufleitung 24 zum Kraftstoffbehälter 12 zurück. Die Rücklaufleitung 24 ist an die Kraftstoff-Einspritzvorrichtung 18 an einem Niederdruckanschluss 26 angeschlossen.To the fuel manifold 16 a plurality of fuel injection devices 18 are connected, of which only one is shown in FIG. For this purpose, the fuel injection device 18 has a high-pressure port 20. The fuel injection device 18 is associated with a combustion chamber 22, in which it injects the fuel directly. From the fuel injector 18, a return line 24 leads back to the fuel tank 12. The return line 24 is connected to the fuel injection device 18 at a low pressure port 26.

Der Aufbau der Kraftstoff-Einspritzvorrichtung 18 wird nun unter Bezugnahme auf die Figuren 2 und 3 näher erläutert:The structure of the fuel injection device 18 will now be explained in more detail with reference to FIGS. 2 and 3:

Danach umfasst die Kraftstoff-Einspritzvorrichtung 18 ein Gehäuse 28, in dem eine in Längsrichtung verlaufende Gehäuseausnehmung 30 vorhanden ist. Das Gehäuse 28 wird auch als "Düsenkörper" bezeichnet. An dem in Figur 2 unteren Ende des Gehäuses 28 sind über den Umfang verteilt angeordnete Kraftstoff-Austrittskanäle 32 vorhanden, über die Kraftstoff aus der Gehäuseausnehmung 30 in den Brennraum 22 gelangen kann.Thereafter, the fuel injection device 18 includes a housing 28 in which a longitudinally extending housing recess 30 is present. The housing 28 is also referred to as a "nozzle body". At the lower end of the housing 28 in FIG. 2, distributed fuel outlet channels 32 are arranged distributed over the circumference, via which fuel can pass from the housing recess 30 into the combustion chamber 22.

Die Gehäuseausnehmung 30 umfasst einen in Figur 2 unteren und am Ende konisch zulaufenden Abschnitt 30a und einen oberen Abschnitt 30b, der einen größeren Durchmesser als der Abschnitt 30a aufweist. In den oberen Abschnitt 30a der Gehäuseausnehmung 30 ist ein Hülsenteil 34 eingesetzt. Wie insbesondere aus Figur 3 hervorgeht, verfügt dieses Hülsenteil 34 über einen durchgehenden und radial innen liegenden Führungsabschnitt 36, einen spitz zulaufenden Dichtabschnitt 37 sowie eine Mehrzahl von über den Umfang des Führungsabschnitts 36 verteilt angeordneten, sich radial nach außen erstreckenden Stegen 38.The housing recess 30 comprises a bottom in FIG. 2 lower and end tapered portion 30 a and an upper portion 30 b, which has a larger diameter than the section 30a has. In the upper portion 30 a of the housing recess 30, a sleeve part 34 is inserted. As can be seen in particular from FIG. 3, this sleeve part 34 has a continuous and radially inner guide section 36, a tapered sealing section 37 and a plurality of webs 38 distributed radially outward over the circumference of the guide section 36.

Wie aus Figur 2 hervorgeht, sind die Stege 38 dabei gegenüber dem Führungsabschnitt 36 etwas nach unten versetzt angeordnet. Die Stege 38 werden durch halbkreisförmige Freiräume 40 gebildet, die zwischen den Stegen 38 vorhanden sind. Die radial abragenden Endflächen 42 der Stege 38 liegen auf einer gemeinsamen Zylinderfläche, welche in etwa der Mantelfläche des oberen Abschnitts 30b der Gehäuseausnehmung 30 entspricht. Auf diese Weise ist das Hülsenteil 34 gegenüber der Gehäuseausnehmung 30 radial festgelegt und zentriert.As can be seen from FIG. 2, the webs 38 are arranged offset slightly downwards relative to the guide section 36. The webs 38 are formed by semicircular spaces 40 which are present between the webs 38. The radially projecting end surfaces 42 of the webs 38 lie on a common cylindrical surface, which corresponds approximately to the lateral surface of the upper portion 30b of the housing recess 30. In this way, the sleeve member 34 is radially fixed relative to the housing recess 30 and centered.

Das Hülsenteil 34 weist eine zentrische durchgehende Führungsbohrung 44 auf. Diese arbeitet mit einem Führungsabschnitt 46 eines Ventilelements 48 zusammen, welches auf diese Weise im Hülsenteil 34 geführt und so in der Gehäuseausnehmung 30 in axialer Richtung beweglich, in radialer Richtung jedoch unverschieblich gehalten ist. An den Führungsabschnitt 46 schließt sich zum in Figur 2 unteren Ende des Ventilelements 48 hin ein Abschnitt 50 an, der einen geringeren Durchmesser aufweist als der Führungsabschnitt 46. Kurz oberhalb des Übergangs vom Abschnitt 30a zum Abschnitt 30b der Gehäuseausnehmung 30 weist der Abschnitt 50 des Ventilelements 48 einen umlaufenden Kragen 52 auf. Zwischen diesem Kragen 52 und dem Führungsabschnitt 36 des Hülsenteils 34 ist eine Schraubendruckfeder 54 verspannt.The sleeve part 34 has a central continuous guide bore 44. This cooperates with a guide portion 46 of a valve element 48, which is guided in this way in the sleeve part 34 and so in the housing recess 30 in the axial direction movable, but held immovable in the radial direction. A portion 50, which has a smaller diameter than the guide section 46, adjoins the guide section 46 toward the lower end of the valve element 48 in FIG. 2. The section 50 of the valve element points just above the transition from the section 30a to the section 30b of the housing recess 30 48 a circumferential collar 52. Between this collar 52 and the guide portion 36 of the sleeve member 34, a helical compression spring 54 is clamped.

Oberhalb des Gehäuses 28 umfasst die Kraftstoff-Einspritzvorrichtung 18 ein plattenförmiges Gegenelement 56. Dieses ist auf in Figur 2 nicht näher dargestellte Art und Weise am Gehäuse 28 befestigt. Es weist zum Gehäuse 28 hin eine ebene Wandfläche 58 auf. Gegen diese wird das Hülsenteil 34 von der Schraubendruckfeder 54 beaufschlagt. Zwischen der Wandfläche 58, dem Hülsenteil 34, und der in Figur 2 oberen Endfläche des Ventilelements 58 ist ein hydraulischer Steuerraum 60 gebildet. Daher wird die obere Endfläche des Ventilelements 48 auch als Steuerfläche bezeichnet. Sie trägt das Bezugszeichen 62.Above the housing 28, the fuel injection device 18 comprises a plate-shaped counter element 56. This is fixed in a manner not shown in Figure 2 on the housing 28. It has a flat wall surface 58 towards the housing 28. Against this, the sleeve part 34 is acted upon by the helical compression spring 54. Between the wall surface 58, the sleeve part 34, and the upper end surface of the valve element 58 in Figure 2, a hydraulic control chamber 60 is formed. Therefore, the upper end surface of the valve element 48 is also referred to as a control surface. It bears the reference numeral 62.

In dem plattenförmigen Gegenelement 56 sind verschiedene Kanäle und Drosseln untergebracht. Daher wird das Gegenelement 56 auch als Drosselplatte bezeichnet. Ein erster Hochdruckkanal 64 verbindet einen radial außerhalb vom Hülsenteil 34 zwischen diesem, dem Ventilelement 48, und der Gehäuseausnehmung 30b vorhandenen Hochdruckraum 66 mit dem Hochdruckanschluss 20. Ein Zulaufkanal 68 mit einer Zulaufdrossel 70 führt vom Hochdruckanschluss 20 zum Steuerraum 60. Ein Ablaufkanal 72, der eine Ablaufdrossel 74 enthält, führt vom Steuerraum 60 zu einem Steuerventil 76. Über dieses kann der Steuerraum 60 wahlweise mit dem Niederdruckanschluss 26 verbunden oder von diesem getrennt werden.In the plate-shaped counter-element 56 different channels and chokes are housed. Therefore, the counter element 56 is also referred to as throttle plate. A first high-pressure channel 64 connects a high-pressure connection 66, which is located radially outside of the sleeve part 34 between the valve element 48 and the housing recess 30b, to the high-pressure connection 20. An inlet channel 68 with an inlet throttle 70 leads from the high-pressure connection 20 to the control chamber 60 contains an outlet throttle 74 leads from the control chamber 60 to a control valve 76. About this, the control chamber 60 can be selectively connected to the low-pressure port 26 or separated from it.

Die in den Figuren 2 und 3 gezeigte Kraftstoff-Einspritzvorrichtung 18 wird folgendermaßen montiert:The fuel injector 18 shown in Figs. 2 and 3 is assembled as follows:

Zunächst wird das Ventilelement 48 in die Gehäuseausnehmung 30 eingesetzt und die Schraubendruckfeder 54 auf das Ventilelement 48 aufgefädelt. Dann wird das Hülsenteil 34 auf den Führungsabschnitt 46 des Ventilelements 48 aufgeschoben und im Abschnitt 30b der Gehäuseausnehmung 30 zentriert. Schließlich wird das Gegenelement 56 am Gehäuse 28 befestigt.First, the valve element 48 is inserted into the housing recess 30 and the helical compression spring 54 is threaded onto the valve element 48. Then, the sleeve part 34 is pushed onto the guide portion 46 of the valve element 48 and in the portion 30 b of the housing recess 30th centered. Finally, the counter element 56 is attached to the housing 28.

Die in den Figuren 2 und 3 gezeigte Kraftstoff-Einspritzvorrichtung 18 wird folgendermaßen betrieben:The fuel injector 18 shown in FIGS. 2 and 3 is operated as follows:

Im Ausgangszustand ist das Steuerventil 76 geschlossen, und am Hochdruckanschluss 20 liegt der in der Kraftstoff-Sammelleitung 16 herrschende hohe Druck an. Somit liegt auch im Hochdruckkanal 64 sowie im Hochdruckraum 66 der entsprechende hohe Kraftstoffdruck an. Auch an einer konischen Druckfläche 78, die an dem in Figur 2 unteren Ende des Ventilelements 48 vorhanden ist, liegt dieser hohe Kraftstoffdruck an, so dass dort eine in Öffnungsrichtung wirkende hydraulische Kraft wirkt. Gleichzeitig wird der hohe Druck über den Zulaufkanal 68 auch in den Steuerraum 60 übertragen. Auch in diesem herrscht daher ein hoher Kraftstoffdruck.In the initial state, the control valve 76 is closed, and at the high pressure port 20 of the prevailing in the fuel rail 16 high pressure is applied. Thus, the corresponding high fuel pressure is also in the high-pressure passage 64 and in the high-pressure chamber 66. Also on a conical pressure surface 78, which is present at the lower end of the valve element 48 in FIG. 2, this high fuel pressure is present, so that there acts a hydraulic force acting in the opening direction. At the same time, the high pressure is also transmitted via the inlet channel 68 into the control chamber 60. Also in this there is therefore a high fuel pressure.

Die an der Steuerfläche 62 in Schließrichtung wirkende hydraulische Kraft ist aufgrund der Flächenverhältnisse jedoch größer als jene, die an der Druckfläche 78 in Öffnungsrichtung wirkt. Das Ventilelement 48 wird daher mit einer Dichtkante 80 gegen einen entsprechenden gehäuseseitigen Ventilsitz (ohne Bezugszeichen) gedrückt. Kraftstoff kann daher durch die Kraftstoff-Austrittskanäle 32 nicht austreten.However, due to the area ratios, the hydraulic force acting on the control surface 62 in the closing direction is greater than that acting on the pressure surface 78 in the opening direction. The valve element 48 is therefore pressed with a sealing edge 80 against a corresponding housing-side valve seat (without reference numerals). Fuel therefore can not escape through the fuel exit channels 32.

Für eine Einspritzung wird das Steuerventil 76 geöffnet. Kraftstoff kann somit aus dem Steuerraum 60 zum Niederdruckanschluss 26 hin abströmen. Die Zulaufdrossel 70 und die Ablaufdrossel 74 sind so aufeinander abgestimmt, dass der Druck im Steuerraum 60 in einer bestimmten Art und Weise sinkt. Unterschreitet die an der Steuerfläche 62 in Schließrichtung wirkende hydraulische Kraft jene in Öffnungsrichtung wirkende Kraft, die an der Druckfläche 78 anliegt, hebt die Dichtkante 80 vom gehäuseseitigen Ventilsitz ab, und das Ventilelement 48 öffnet.For injection, the control valve 76 is opened. Fuel can thus flow out of the control chamber 60 to the low pressure port 26 out. The inlet throttle 70 and the outlet throttle 74 are coordinated so that the pressure in the control chamber 60 decreases in a certain way. If the hydraulic force acting on the control surface 62 in the closing direction falls below that in FIG Opening force acting on the pressure surface 78, lifts the sealing edge 80 from the housing-side valve seat, and the valve element 48 opens.

Dabei wird es während dieser Öffnungsbewegung durch den Führungsabschnitt 46 in der Führungsbohrung 44 des Hülsenteils 34 sicher geführt. Gleichzeitig sorgt die enge Gleitführung zwischen dem Führungsabschnitt 46 und der Führungsbohrung 44 für eine gute Abdichtung des Steuerraums 60 gegenüber dem Hochdruckraum 66. Wenn die Dichtkante 80 vom gehäuseseitigen Ventilsitz abhebt, kann Kraftstoff zu den Kraftstoff-Austrittskanälen 32 gelangen, so dass die Kraftstoff-Einspritzvorrichtung 18 Kraftstoff in den Brennraum 22 einspritzt.It is guided safely during this opening movement by the guide portion 46 in the guide bore 44 of the sleeve member 34. At the same time, the close sliding guide between the guide portion 46 and the guide bore 44 provides a good seal of the control chamber 60 with respect to the high-pressure chamber 66. When the sealing edge 80 lifts off the housing-side valve seat, fuel can reach the fuel outlet channels 32, so that the fuel injection device 18 injects fuel into the combustion chamber 22.

Soll die Einspritzung beendet werden, wird das Steuerventil 76 wieder geschlossen. Damit steigt der Druck im Steuerraum 60 an und das Ventilelement 48 kommt mit der Dichtkante 80 in Anlage an den gehäuseseitigen Ventilsitz.If the injection is to be ended, the control valve 76 is closed again. Thus, the pressure in the control chamber 60 increases and the valve element 48 comes with the sealing edge 80 in abutment against the housing-side valve seat.

Dadurch, dass der Abschnitt 50 des Ventilelements 48, in dessen Bereich die Schraubendruckfeder 54 angeordnet ist, einen vergleichsweise kleinen Durchmesser hat, kann es während der Bewegung des Ventilelements 48 zwischen der Schraubendruckfeder 54 und dem Ventilelement 48 zu keiner Gleitreibung kommen. Somit wird ein entsprechender Verschleiß der Feder 54 und des Ventilelements 48 reduziert bzw. vollständig vermieden. Da das Ventilelement 48, sobald die Dichtkante 80 vom gehäuseseitigen Ventilsitz abgehoben hat, nur noch über den Führungsabschnitt 46 in der Führungsbohrung 44 des Hülsenteils 34 geführt wird, ist eine aufwendige Bearbeitung der Gehäuseausnehmung 30 zur Führung des Ventilelements 48 nicht erforderlich. Die halbkreisförmigen Freiräume 40 zwischen den Stegen 38 des Hülsenteils 34 können so dimensioniert sein, dass eine gewünschte Drosselwirkung vom Hochdruckkanal 64 zu den Kraftstoff-Austrittskanälen 32 hin eintritt. In einem nicht dargestellten Ausführungsbeispiel wird auf die Schraubendruckfeder 54 auch vollständig verzichtet. In diesem Fall ist das Hülsenteil 34 in die Gehäuseausnehmung 30 im Gehäuse 28 im Presssitz eingepasst.Characterized in that the portion 50 of the valve element 48, in the region of the helical compression spring 54 is arranged, has a relatively small diameter, it can during the movement of the valve element 48 between the helical compression spring 54 and the valve element 48 to come to no sliding friction. Thus, a corresponding wear of the spring 54 and the valve member 48 is reduced or completely avoided. Since the valve element 48, as soon as the sealing edge 80 has lifted from the housing-side valve seat, is guided only over the guide portion 46 in the guide bore 44 of the sleeve member 34, a complex processing of the housing recess 30 for guiding the valve element 48 is not required. The semicircular free spaces 40 between the webs 38 of the sleeve part 34 may be dimensioned such that a desired throttle effect from the high-pressure passage 64 to the fuel outlet channels 32 out occurs. In an exemplary embodiment, not shown, the helical compression spring 54 is completely dispensed with. In this case, the sleeve part 34 is fitted in the housing recess 30 in the housing 28 in a press fit.

Eine alternative Ausführungsform einer Kraftstoff-Einspritzvorrichtung ist in Figur 4 gezeigt. Dabei tragen solche Elemente und Bereiche, die äquivalente Funktionen zu Elementen und Bereichen des im Zusammenhang mit den Figuren 2 und 3 gezeigten Ausführungsbeispiels aufweisen, die gleichen Bezugszeichen. Sie sind nicht nochmals im Detail erläutert. Aus Darstellungsgründen sind ferner nicht alle Bezugszeichen eingetragen.An alternative embodiment of a fuel injection device is shown in FIG. In this case, bear such elements and areas that have equivalent functions to elements and areas of the embodiment shown in connection with Figures 2 and 3, the same reference numerals. They are not explained again in detail. For reasons of representation, not all reference numbers are also entered.

Die Unterschiede der in Figur 4 gezeigten Kraftstoff-Einspritzvorrichtung 18 zu der vorhergehenden betreffen die Ausgestaltung des Hülsenteils 34 und der Wandfläche 58 der Drosselplatte 56. Das Hülsenteil 34 verfügt über keine Stege, sondern nur über einen Führungsabschnitt 36 und zur Drosselplatte 56 hin über einen Dichtabschnitt 37. Die Wandfläche 58 weist im Bereich der Gehäuseausnehmung 30 eine konisch konkave Ausnehmung 82 auf. Der Dichtabschnitt 37 des Hülsenteils 34 liegt an der Drosselplatte 56 im Bereich dieser konischen Ausnehmung 82 an. Auf diese Weise wird das Hülsenteil 34 gegenüber der Drosselplatte 56 zentriert, gegen die es durch die Schraubendruckfeder 54 gedrückt wird. Auf eine direkte Zentrierung des Hülsenteils 34 gegenüber der Gehäuseausnehmung 30 kann daher verzichtet werden. Allerdings muss die Drosselplatte 56 gegenüber dem Gehäuse 28 sehr genau positioniert werden, was beispielsweise durch Spannstifte oder eine Zentriernut (beides nicht dargestellt) möglich ist.The differences between the fuel injection device 18 shown in Figure 4 to the preceding relate to the configuration of the sleeve member 34 and the wall surface 58 of the throttle plate 56. The sleeve member 34 has no webs, but only a guide portion 36 and the throttle plate 56 through a sealing portion 37. The wall surface 58 has a conically concave recess 82 in the region of the housing recess 30. The sealing portion 37 of the sleeve member 34 abuts against the throttle plate 56 in the region of this conical recess 82. In this way, the sleeve member 34 is centered with respect to the throttle plate 56 against which it is pressed by the helical compression spring 54. On a direct centering of the sleeve member 34 relative to the housing recess 30 can therefore be omitted. However, the throttle plate 56 must be positioned very accurately relative to the housing 28, which is possible for example by means of dowel pins or a centering groove (both not shown).

Eine nochmals abgewandelte Ausführungsform ist in Figur 5 gezeigt. Dabei gilt im Hinblick auf funktionsäquivalente Elemente und Bereiche das oben Gesagte.A further modified embodiment is shown in FIG. The above applies with regard to functionally equivalent elements and areas.

Bei der in Figur 5 gezeigten Kraftstoff-Einspritzvorrichtung 18 ist die Wandfläche 58 der Drosselplatte 56 insgesamt konisch konkav ausgebildet. Eine gegenüberliegende Gehäusefläche 84 ist hierzu komplementär ausgebildet, das heißt konisch konvex. Auf diese Weise kann auf eine besondere Positionierung der Drosselplatte 56 gegenüber dem Gehäuse 28 verzichtet werden, da sich diese quasi von selbst aneinander zentrieren.In the fuel injection device 18 shown in Figure 5, the wall surface 58 of the throttle plate 56 is formed as a whole conically concave. An opposite housing surface 84 is complementary thereto, that is conical convex. In this way, can be dispensed with a special positioning of the throttle plate 56 relative to the housing 28, since these center virtually by themselves to each other.

Claims (9)

  1. Fuel injection device (18), in particular for an internal combustion engine with direct fuel injection, having a housing (28) and having a valve element (48) which is arranged in a housing recess (30) and to which is assigned at least one fuel outlet duct (32), and having a sleeve part (34) which is coaxial with respect to the valve element (48) and is seated on an end-side guide section (46), which faces away from the fuel outlet duct (32), of the valve element (48), wherein a control face (62), which acts in the closing direction, is provided on that end of the valve element (48) which, in the installation position, faces away from a combustion chamber (22), which control face (62) delimits a hydraulic control space (60), and wherein the sleeve element (34) projects, at least when the valve element (48) is closed, beyond said end (62) of the valve element (48) and is pressed by means of a preloading device (54) against a wall (58), which faces the control face (62), of a mating element (56) in such a way as to seal off the control space (60) with respect to the mating element (56), characterized in that said fuel injection device (18) comprises alignment means (38; 82; 58) which align the sleeve part (34) radially with respect to the housing recess (30), and in that the valve element (48) is guided only in the housing part (34).
  2. Fuel injection device (18) according to Claim 1, characterized in that the alignment means (38) comprise at least one peripheral wall (42) on the sleeve part (34), which peripheral wall (42) bears against the wall of the housing recess (30).
  3. Fuel injection device (18) according to one of Claims 1 or 2, characterized in that the alignment means has a plurality of radially extending webs (38) which bear in each case with their projecting end (42) against the wall of the housing recess (30).
  4. Fuel injection device (18) according to Claim 3, characterized in that the free spaces (40) which are present between the webs (38) are dimensioned so as to obtain a desired throttling effect.
  5. Fuel injection device (18) according to one of Claims 3 or 4, characterized in that the webs (38) are arranged so as to be offset axially away from the control space (60).
  6. Fuel injection device (18) according to one of the preceding claims, characterized in that the alignment means comprise a conical recess (82) in the wall (58) of the mating element (56) in the region of the housing recess (60), in such a way that the sleeve part (34) is centred by the conical recess (82).
  7. Fuel injection device (18) according to one of the preceding claims, characterized in that the alignment means comprise a wall (58), which is conical overall and faces the control face (62), of the mating element (56) and a corresponding housing wall (84) which is complementary to said wall (58), in such a way that the sleeve part (34) and the housing (30) are centred by the conical wall (58).
  8. Fuel injection device (18) according to one of Claims 5 or 6, characterized in that the conical recess (82) or the conical wall (58) of the mating element (56) is concave.
  9. Fuel injection device (18) according to one of the preceding claims, characterized in that the valve element (48) has a guide section (46) which is guided in the sleeve part (34) and has a larger diameter than a region, around which the preloading device (54) is arranged, of the valve element (50).
EP04762588A 2003-09-23 2004-08-04 Fuel injection device, especially for a direct injection internal combustion engine Expired - Fee Related EP1671029B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003146222 DE10346222A1 (en) 2003-09-23 2003-09-23 Fuel injection device, especially for internal combustion engine with direct injection, has alignment arrangement that aligns sleeve part radially relative to housing recess and valve element is guided in sleeve part
PCT/DE2004/001743 WO2005038235A2 (en) 2003-09-23 2004-08-04 Fuel injection device, especially for a direct injection internal combustion engine

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EP1671029A2 EP1671029A2 (en) 2006-06-21
EP1671029B1 true EP1671029B1 (en) 2007-10-31

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Publication number Priority date Publication date Assignee Title
DE102004024527A1 (en) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Fuel injection system
DE102005039688A1 (en) * 2005-08-22 2007-03-01 Siemens Ag Nozzle assembly for injection valve, has casing arranged, such that flexural rigidity of casing is varied over axial length of housing and change of gap measure counteracts based on fluid pressure, where is formed between body and needle
JP4428357B2 (en) 2006-04-03 2010-03-10 株式会社デンソー Fuel injection valve
DE102006021491A1 (en) 2006-05-09 2007-11-15 Robert Bosch Gmbh Fuel injector with directly operable nozzle needle
DE102008005523A1 (en) * 2008-01-23 2009-07-30 Robert Bosch Gmbh fuel injector
DE102008061400A1 (en) * 2008-12-10 2010-06-17 Man Diesel Se Fuel injection valve for an internal combustion engine

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Publication number Priority date Publication date Assignee Title
GB809044A (en) * 1955-09-19 1959-02-18 Licencia Talalmanyokat Improvements in or relating to fuel injectors for diesel engines
DE59506715D1 (en) * 1994-06-06 1999-10-07 Ganser Hydromag Fuel injection valve for internal combustion engines
DE10122256A1 (en) * 2001-05-08 2002-11-21 Bosch Gmbh Robert Fuel injection device for internal combustion engines, in particular common rail injector, and fuel system and internal combustion engine

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DE502004005391D1 (en) 2007-12-13
WO2005038235A3 (en) 2006-01-26
WO2005038235A2 (en) 2005-04-28
DE10346222A1 (en) 2005-04-14
EP1671029A2 (en) 2006-06-21

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