EP1776522A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1776522A1
EP1776522A1 EP05738062A EP05738062A EP1776522A1 EP 1776522 A1 EP1776522 A1 EP 1776522A1 EP 05738062 A EP05738062 A EP 05738062A EP 05738062 A EP05738062 A EP 05738062A EP 1776522 A1 EP1776522 A1 EP 1776522A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
valve
nozzle body
closing body
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.)
Withdrawn
Application number
EP05738062A
Other languages
German (de)
French (fr)
Inventor
Guenther Hohl
Marco Vorbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1776522A1 publication Critical patent/EP1776522A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • 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
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • DE 101 52 415 A1 discloses an externally radiating fuel injection valve which has a conical sealing seat.
  • the fuel injection valve comprises a guided in a nozzle body valve needle which is actuated by an actuator and is acted upon by a return spring so that a standing with the valve needle in operative connection valve closing body is held in sealing engagement with a valve seat surface.
  • a projection is formed, which projects beyond the valve closing body of the fuel injection valve.
  • a disadvantage of the known from DE 101 52 415 Al fuel injector is in particular that the production of the elevation of the nozzle body relative to the valve closing body protects the conical sealing seat from damage, but is expensive to manufacture and due to its exposed position itself tends to damage which negatively change the spray pattern of the fuel injection valve and also affect the desired protective function of the superelevation.
  • the fuel injection valve according to the characterizing features of the main claim has the advantage that by simple measures on the contour of the nozzle body and the valve closing body reliable protection of the sealing seat against mechanical damage home transport and assembly of the fuel injector is possible by a transition region between the nozzle body and the valve closing body is concave.
  • an angle between the abutting surfaces of the nozzle body and the valve closing body is less than 180 °, so that the sum of the two edge angles of the edges of the nozzle body and valve closing body greater than 180 °, the two edges are so obtuse.
  • transition region is recessed with the edges opposite to a surface plane of the fuel injection valve.
  • FIG. 1 shows a schematic section through an exemplary embodiment of an inventively designed fuel injector
  • FIG. 2 shows a schematic comparative sectional view of the exemplary embodiment of a fuel injection valve according to the invention shown in FIG. 1 in region II in FIG. 1 and a fuel injection valve according to the prior art
  • Fig. 3 is a schematic comparative view of a sealing seat of a
  • FIG. 1 An illustrated in Fig. 1 embodiment of a fuel injection valve 1 according to the invention is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, Fremdgezündelen Brerinkraflmaschinen.
  • the fuel injection valve 1 is particularly suitable for the direct injection of fuel into a combustion chamber, not shown, of a Brennkrafhnaschine.
  • the fuel injection valve 1 consists of a housing body 2 and a nozzle body 3, in which a valve needle 4 is arranged.
  • the valve needle 4 is in operative connection with a valve closing body 5, which cooperates with a valve seat surface 6 to form a sealing seat.
  • the fuel injection valve 1 is an outwardly opening fuel injection valve 1.
  • the fuel injection valve 1 has an actuator 7, which in the exemplary embodiment is designed as a piezoelectric actuator 7.
  • the actuator is supported, on the one hand, on the housing body 2 and, on the other hand, on a shoulder 8 operatively connected to the valve needle 4. Downstream of the shoulder 8, a return spring 9 is arranged, which in turn is supported on the nozzle body 3.
  • the valve needle 4 has a fuel channel 10, through which the fuel supplied by an inlet-side central fuel supply 11 is led to the sealing seat.
  • a swirl chamber 12 is formed, into which the fuel channel 10 opens.
  • the shoulder 8 In the resting state of the fuel injection valve 1, the shoulder 8 is acted upon by the force of the return spring 9 against the stroke direction so that the valve closing body 5 at the Valve seat surface 6 is heard in sealing contact. Upon excitation of the piezoelectric actuator 7, this expands in the axial direction against the spring force of the return spring 9, so that the shoulder 8 is moved in the stroke direction with the valve needle 4, which is non-positively connected to the shoulder 8.
  • the valve closing body 5 lifts off from the valve seat surface 6, and the fuel supplied via the fuel channel 10 is hosed down.
  • Conventional fuel injection valves 1 usually have in the region of the sealing seat on a convex transition region 13, as shown schematically in Fig. 1 right.
  • This sacrificenfbrm which is composed of a surface 14 of the nozzle body 3 and a äbström herb adjacent surface 15 of the valve closing body 5, is usually chosen to ensure ease of manufacture and a smooth surface, but has the distinct disadvantage that edges 16, 17 the nozzle body 3 and the valve closing body 5 are conditionally exposed due to the convex shape of the transition region 13 and thus can be damaged, for example, during transport or assembly of the fuel injection valve 1. Since the shape of the edges 16, 17 is responsible for the shape of the mixture cloud and the jet pattern, damages in this area have an adverse effect on the cylinder charge, the combustion and the emission values of the internal combustion engine.
  • the transition region 13 in the region of the sealing seat is not convex, but concave, as shown on the left in FIG.
  • the measures according to the invention are shown enlarged in FIGS. 2 and 3 and described in detail in the following description.
  • FIGS. 2 and 3 show, in a fragmentary sectional view, the detail, designated II in FIG. 1, of the inventively embodied fuel injection valve 1 according to FIG closed and open state of the fuel injection valve 1.
  • Matching components are provided with matching reference numerals.
  • the transition region 13 of the fuel injection valve 1 concave in the region of the sealing seat, so that the angle ⁇ between the surfaces 14 and 15 is less than 180 °.
  • the sum of the two edge angles ⁇ of the edges 16, 17 on nozzle body 3 and valve closing body 5 is greater than 180 °, ie the individual edge angles ⁇ greater than 90 ° and the two edges 16, 17 obtuse.
  • the edges 16 and 17 are thus less sensitive to damage.
  • the edges 16 and 17 are also protected by the concave shape of the transition region 13, since they are recessed with respect to a surface plane 18 of the fuel injection valve 1 indicated by dashed lines.
  • the invention is not limited to the illustrated embodiment and e.g. also applicable to electromagnetically actuated fuel injectors 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel injection valve (1) for directly injecting fuel into the combustion chamber of an internal combustion engine. Said valve comprises a valve needle (4) which is arranged in a nozzle body (3), can be actuated by an activator (7), and is acted upon by a restoring spring (9) in such a way that a valve closing body (5) interacting with the valve needle (4) and facing the combustion chamber is held on a valve seat surface in the unactuated state of the actuator (7) in a sealing manner. A surface of the fuel injection valve (1) is embodied in a concave manner in a transition region (13) between the nozzle body (3) and the valve closing body (5).

Description

BreπnstoffeinspritzveπtüBreπnstoffeinspritzveπtü
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection valve according to the preamble of the main claim.
Beispielsweise ist aus der DE 101 52 415 Al ein nach außen öühendes Brennstoffeinspritzventil bekannt, welches einen kegeligen Dichtsitz aufweist. Das Brennstoffeinspritzventil umfasst eine in einem Düsenkörper geführte Ventilnadel, welche durch einen Aktor betätigbar ist und durch eine Rückstellfeder so beaufschlagt ist, dass ein mit der Ventilnadel in Wirkverbindung stehender Ventilschließkörper in dichtender Anlage an einer Ventilsitzfläche gehalten wird. An einem abströmseitigen Ende des Brennstoffeinspritzventils ist ein Vorsprung ausgebildet, welcher den Ventilschließkörper des Brennstoffeinspritzventils überragt.For example, DE 101 52 415 A1 discloses an externally radiating fuel injection valve which has a conical sealing seat. The fuel injection valve comprises a guided in a nozzle body valve needle which is actuated by an actuator and is acted upon by a return spring so that a standing with the valve needle in operative connection valve closing body is held in sealing engagement with a valve seat surface. At a downstream end of the fuel injection valve, a projection is formed, which projects beyond the valve closing body of the fuel injection valve.
Nachteilig bei dem aus der DE 101 52 415 Al bekanntem Brennstofifeinspritzventil ist insbesondere, dass die Herstellung der Überhöhung des Düsenkörpers gegenüber dem Ventilschließkörper zwar den kegeligen Dichtsitz vor Beschädigungen schützt, jedoch aufwendig in der Herstellung ist und bedingt durch seine exponierte Lage selbst zu Beschädigungen neigt, die das Strahlbild des Brennstoffeinspritzventils negativ verändern und zudem die gewünschte Schutzfunktion der Überhöhung beeinträchtigen. Vorteile der ErfindungA disadvantage of the known from DE 101 52 415 Al fuel injector is in particular that the production of the elevation of the nozzle body relative to the valve closing body protects the conical sealing seat from damage, but is expensive to manufacture and due to its exposed position itself tends to damage which negatively change the spray pattern of the fuel injection valve and also affect the desired protective function of the superelevation. Advantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass durch einfache Maßnahmen an der Kontur des Düsenkörpers und des Ventilschließkörpers ein zuverlässiger Schutz des Dichtsitzes vor mechanischen Beschädigungen heim Transport und der Montage des Brennstoffeinspritzventils möglich ist, indem ein Übergangsbereich zwischen dem Düsenkörper und dem Ventilschließkörper konkav gestaltet ist.The fuel injection valve according to the characterizing features of the main claim has the advantage that by simple measures on the contour of the nozzle body and the valve closing body reliable protection of the sealing seat against mechanical damage home transport and assembly of the fuel injector is possible by a transition region between the nozzle body and the valve closing body is concave.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in the main claim are possible.
Vorteilhafterweise beträgt ein Winkel zwischen den aneinanderstoßenden Oberflächen des Düsenkörpers und des Ventilschließkörpers weniger als 180°, so dass die Summe der beiden Kantenwinkel der Kanten an Düsenkörper und Ventilschließkörper größer als 180°, die beiden Kanten also stumpfwinklig sind.Advantageously, an angle between the abutting surfaces of the nozzle body and the valve closing body is less than 180 °, so that the sum of the two edge angles of the edges of the nozzle body and valve closing body greater than 180 °, the two edges are so obtuse.
Von Vorteil ist außerdem, dass der Übergangsbereich mit den Kanten gegenüber einer Oberflächenebene des Brennstoffeinspritzventils vertieft angeordnet ist.It is also advantageous that the transition region is recessed with the edges opposite to a surface plane of the fuel injection valve.
Zeichnungdrawing
Ein Ausfijhrungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1 einen schematischen Schnitt durch ein Ausfuhrungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils,1 shows a schematic section through an exemplary embodiment of an inventively designed fuel injector,
Fig.2 einen schematische vergleichende Schnittdarstellung des in Fig. 1 dargestellten Ausfuhrungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1 und eines Brennstoffeinspritzventils gemäß dem Stand der Technik, und Fig. 3 eine schematische vergleichende Darstellung eines Dichtsitzes eines2 shows a schematic comparative sectional view of the exemplary embodiment of a fuel injection valve according to the invention shown in FIG. 1 in region II in FIG. 1 and a fuel injection valve according to the prior art, and Fig. 3 is a schematic comparative view of a sealing seat of a
Brennstoffeinspritzventils gemäß dem Stand der Technik und eines erfindungsgemäßen Brennstoffeinspritzventils im geöffneten Zustand des Brennstoffeinspritzventils.Fuel injection valve according to the prior art and a fuel injection valve according to the invention in the open state of the fuel injection valve.
Beschreibung des AusfiihrungsbeispielsDescription of the exemplary embodiment
Ein in Fig. 1 dargestelltes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündelen Brerinkraflmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkrafhnaschine.An illustrated in Fig. 1 embodiment of a fuel injection valve 1 according to the invention is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, Fremdgezündelen Brerinkraflmaschinen. The fuel injection valve 1 is particularly suitable for the direct injection of fuel into a combustion chamber, not shown, of a Brennkrafhnaschine.
Das Brennstoffeinspritzventil 1 besteht aus einem Gehäusekörper 2 und einem Düsenkörper 3, in welchem eine Ventilnadel 4 angeordnet ist. Die Ventilnadel 4 steht mit einem Ventilschließkörper 5 in Wirkverbindung, der mit einer Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brermstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein nach außen öffnendes Brennstoffeinspritzventil 1. Das Brerinstoffeinspritzventil 1 weist einen Aktor 7 auf, der im Ausführungsbeispiel als piezoelektrischer Aktor 7 ausgeführt ist. Der Aktor stützt sich einerseits an dem Gehäusekörper 2 und andererseits an einer mit der Ventilnadel 4 in Wirkverbindung stehenden Schulter 8 ab. Abströmseitig der Schulter 8 ist eine Rückstellfeder 9 angeordnet, welche sich ihrerseits an dem Düsenkörper 3 abstützt.The fuel injection valve 1 consists of a housing body 2 and a nozzle body 3, in which a valve needle 4 is arranged. The valve needle 4 is in operative connection with a valve closing body 5, which cooperates with a valve seat surface 6 to form a sealing seat. In the exemplary embodiment, the fuel injection valve 1 is an outwardly opening fuel injection valve 1. The fuel injection valve 1 has an actuator 7, which in the exemplary embodiment is designed as a piezoelectric actuator 7. The actuator is supported, on the one hand, on the housing body 2 and, on the other hand, on a shoulder 8 operatively connected to the valve needle 4. Downstream of the shoulder 8, a return spring 9 is arranged, which in turn is supported on the nozzle body 3.
Die Ventilnadel 4 weist einen Brennstoffkanal 10 auf, durch welchen der durch eine zulaufseitige zentrale Brennstofrzufuhr 11 zugeleitete Brennstoff zum Dichtsitz geführt wird. Zuströmseitig des Dichtsitzes ist eine Drallkammer 12 ausgebildet, in welche der Brennstoffkanal 10 ausmündet.The valve needle 4 has a fuel channel 10, through which the fuel supplied by an inlet-side central fuel supply 11 is led to the sealing seat. On the inflow side of the sealing seat, a swirl chamber 12 is formed, into which the fuel channel 10 opens.
Im Ruhezustand des Brennstoffeinspritzventils 1 wird die Schulter 8 durch die Kraft der Rückstellfeder 9 entgegen der Hubrichtung so beaufschlagt, dass der Ventilschließkörper 5 an der Ventilsitzfläche 6 in dichtender Anlage gehallen wird. Bei Erregung des piezoelektrischen Aktors 7 dehnt sich dieser in axialer Richtung entgegen der Federkraft der Rückstellfeder 9 aus, so dass die Schulter 8 mit der Ventilnadel 4, welche mit der Schulter 8 kraftschlüssig verbunden ist, in Hubrichtung bewegt wird. Der Ventilschließkörper 5 hebt von der Ventilsitzfläche 6 ab, und der über den Brennstofflcanal 10 zugeführte Brennstoff wird abgespritzt.In the resting state of the fuel injection valve 1, the shoulder 8 is acted upon by the force of the return spring 9 against the stroke direction so that the valve closing body 5 at the Valve seat surface 6 is heard in sealing contact. Upon excitation of the piezoelectric actuator 7, this expands in the axial direction against the spring force of the return spring 9, so that the shoulder 8 is moved in the stroke direction with the valve needle 4, which is non-positively connected to the shoulder 8. The valve closing body 5 lifts off from the valve seat surface 6, and the fuel supplied via the fuel channel 10 is hosed down.
Wird der Erregerstrom abgeschaltet, reduziert sich die axiale Ausdehnung des piezoelektrischen Aktors 7, wodurch die Ventilnadel 4 durch den Druck der Rückstellfeder 9 entgegen der Hubrichtung bewegt wird. Der Ventilschließkörper 5 setzt auf der Ventilsitzfläche 6 auf und das Brennstoffeinspritzventil 1 wird geschlossen.If the excitation current is switched off, the axial extent of the piezoelectric actuator 7 is reduced, as a result of which the valve needle 4 is moved counter to the stroke direction by the pressure of the return spring 9. The valve closing body 5 is seated on the valve seat surface 6 and the fuel injection valve 1 is closed.
Herkömmliche Brennstoffeinspritzventile 1 weisen meistens im Bereich des Dichtsitzes einen konvexen Übergangsbereich 13 auf, wie in Fig. 1 rechts schematisch dargestellt. Diese Oberflächenfbrm, welche sich aus einer Oberfläche 14 des Düsenkörpers 3 und einer daran äbströmseitig angrenzenden Oberfläche 15 des Ventilschließkörpers 5 zusammensetzt, wird meist gewählt, um eine leichte Herstellbarkeit und eine glatte Oberfläche zu gewährleisten, hat jedoch den entscheidenden Nachteil, dass Kanten 16, 17 des Düsenkörpers 3 und des Ventilschließkörpers 5 bedingt durch die konvexe Form des Übergangsbereichs 13 exponiert liegen und dadurch beispielsweise beim Transport oder der Montage des Brennstoffeinspritzventils 1 beschädigt werden können. Da die Form der Kanten 16, 17 für die Form der Gemischwolke und des Strahlbildes verantwortlich ist, wirken sich Beschädigungen in diesem Bereich nachteilig auf die Zylinderfüllung, die Verbrennung und die Emissionswerte der Brennkraftmaschine aus.Conventional fuel injection valves 1 usually have in the region of the sealing seat on a convex transition region 13, as shown schematically in Fig. 1 right. This Oberflächenfbrm, which is composed of a surface 14 of the nozzle body 3 and a äbströmseitig adjacent surface 15 of the valve closing body 5, is usually chosen to ensure ease of manufacture and a smooth surface, but has the distinct disadvantage that edges 16, 17 the nozzle body 3 and the valve closing body 5 are conditionally exposed due to the convex shape of the transition region 13 and thus can be damaged, for example, during transport or assembly of the fuel injection valve 1. Since the shape of the edges 16, 17 is responsible for the shape of the mixture cloud and the jet pattern, damages in this area have an adverse effect on the cylinder charge, the combustion and the emission values of the internal combustion engine.
Im Gegensatz dazu ist erfϊndungsgemäß vorgesehen, den Übergangsbereich 13 im Bereich des Dichtsitzes nicht konvex, sondern konkav zu gestalten, wie in Fig. 1 links dargestellt. Die erfindungsgemäßen Maßnahmen sind in den Fig. 2 und 3 vergrößert dargestellt und in der nachfolgenden Beschreibung detailliert beschrieben.In contrast, according to the invention, it is provided that the transition region 13 in the region of the sealing seat is not convex, but concave, as shown on the left in FIG. The measures according to the invention are shown enlarged in FIGS. 2 and 3 and described in detail in the following description.
Fig.2 und 3 zeigen in einer ausschnittsweisen Schnittdarstellung den in Fig. 1 mit II bezeichneten Ausschnitt aus dem erfindungsgemäß ausgestalteten Brennstoffeinspritzventil 1 gemäß Fig. 1 im geschlossenen und geöffneten Zustand des Brennstofifeinspritzventils 1. Übereinstimmende Bauteile sind dabei mit übereinstimmenden Bezugszeichen versehen.FIGS. 2 and 3 show, in a fragmentary sectional view, the detail, designated II in FIG. 1, of the inventively embodied fuel injection valve 1 according to FIG closed and open state of the fuel injection valve 1. Matching components are provided with matching reference numerals.
Wie bereits weiter oben erwähnt, weisen herkömmliche Brennstoffeinspritzventile 1 im Bereich des Dichtsitzes einen konvexen Übergangsbereich 13 auf, bei welchem ein von den Oberflächen 14 und 15 eingeschlossener Winkel α größer oder allenfalls genau 180° ist. Dies bedingt einen erhabenen oder allenfalls glatten Übergangsbereich 13, bei welchem, wie in Fig. 3 rechts gut sichtbar, die Kanten 16 und 17 deutlich hervorstechen, da die Summe von zwei Kantenwinkeln γ bedingt durch den großen Winkel α signifikant kleiner als 90° ist. Scharfe Kanten 16 und 17 sind jedoch anfällig gegen Beschädigungen wie Kerben, welche beim Transport und der Montage des Brennstoffeinspritzventils 1 auftreten können.As already mentioned above, conventional fuel injection valves 1 in the region of the sealing seat have a convex transition region 13, in which an angle α enclosed by the surfaces 14 and 15 is greater than or at most exactly 180 °. This requires a raised or at most smooth transition region 13, in which, as clearly visible in FIG. 3, the edges 16 and 17 clearly stand out, since the sum of two edge angles γ is significantly less than 90 ° due to the large angle α. Sharp edges 16 and 17, however, are susceptible to damage such as notches that may occur during transportation and assembly of the fuel injector 1.
Daher bietet sich an, wie in Fig. 2 und 3 links dargestellt, den Übergangsbereich 13 des Brennstoffeinspritzventils 1 im Bereich des Dichtsitzes konkav zu gestalten, so dass der zwischen den Oberflächen 14 und 15 liegende Winkel α kleiner als 180° ist. Dadurch ist die Summe der beiden Kantenwinkel γ der Kanten 16, 17 an Düsenkörper 3 und Ventilschließkörper 5 größer als 180°, die einzelnen Kantenwinkel γ also größer als 90° und die beiden Kanten 16, 17 stumpfwinklig. Die Kanten 16 und 17 sind dadurch unempfindlicher gegen Beschädigungen. Zudem sind die Kanten 16 und 17 auch durch die konkave Form des Übergangsbereichs 13 geschützt, da sie eingetieft gegenüber einer gestrichelt angedeuteten Oberflächenebene 18 des Brennstoffeinspritzventils 1 liegen.Therefore, it is advisable, as shown on the left in FIGS. 2 and 3, to make the transition region 13 of the fuel injection valve 1 concave in the region of the sealing seat, so that the angle α between the surfaces 14 and 15 is less than 180 °. As a result, the sum of the two edge angles γ of the edges 16, 17 on nozzle body 3 and valve closing body 5 is greater than 180 °, ie the individual edge angles γ greater than 90 ° and the two edges 16, 17 obtuse. The edges 16 and 17 are thus less sensitive to damage. In addition, the edges 16 and 17 are also protected by the concave shape of the transition region 13, since they are recessed with respect to a surface plane 18 of the fuel injection valve 1 indicated by dashed lines.
Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und z.B. auch für elektromagnetisch betätigbare Brennstoffeinspritzventile 1 anwendbar. The invention is not limited to the illustrated embodiment and e.g. also applicable to electromagnetically actuated fuel injectors 1.

Claims

Anspriiche Anspriiche
1. Brennstoffeinspritzventil (1), insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer Brennkraftmaschine, mit einer in einem Düsenkörper (3) angeordneten Ventilnadel (4), welche durch einen Aktor (7) betätigbar ist und durch eine Rückstellfeder (9) so beaufschlagt ist, dass ein mit der Ventilnadel (4) in Wirkverbindung stehender, dem Brennraum zugewandter Ventilschließkörper (5) im unbetätigten Zustand des Aktors (7) in dichtender Anlage an einer Ventilsitzfläche (6) gehalten wird, dadurch gekennzeichnet, dass eine Oberfläche des Brennstoffeinspritzventils (1) in einem Übergangsbereich (13) zwischen Düsenkörper (3) und Ventilschließkörper (5) konkav ausgebildet ist.1. Fuel injection valve (1), in particular for direct injection of fuel into the combustion chamber of an internal combustion engine, with a in a nozzle body (3) arranged valve needle (4), which by an actuator (7) is actuated and by a return spring (9) so in the unactuated state of the actuator (7) is held in sealing contact with a valve seat surface (6), which is in operative connection with the valve needle (4) facing the combustion chamber, characterized in that a surface of the fuel injection valve (1) in a transition region (13) between the nozzle body (3) and valve closing body (5) is concave.
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Übergangsbereich (13) aus zwei aneinandergrenzenden Oberflächen (14, 15) des Düsenkörpers (3) und des Ventilschließkörpers (5) gebildet ist.2. Fuel injection valve according to claim 1, characterized in that the transition region (13) consists of two adjoining surfaces (14, 15) of the nozzle body (3) and the valve closing body (5) is formed.
3. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass ein Winkel (α) zwischen den Oberflächen (14, 15) kleiner als 180° ist3. Fuel injection valve according to claim 2, characterized in that an angle (α) between the surfaces (14, 15) is smaller than 180 °
4. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass am Düsenkörper (3) und am Ventilschließkörper (5) jeweils eine Kante (16, 17) ausgebildet sind.4. Fuel injection valve according to one of claims 1 to 3, characterized in that on the nozzle body (3) and on the valve closing body (5) each have an edge (16, 17) are formed.
5. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, dass die Kanten (16, 17) Kantenwinkel (γ) aurweisen, welche jeweils mindestens 90° betragen.5. Fuel injection valve according to claim 4, characterized in that the edges (16, 17) aurweisen edge angle (γ), which each amount to at least 90 °.
6. Brennstoffeinspritzventil nach Anspruch 5, dadurch gekennzeichnet, dass die Summe der Kantenwinkel (γ) zusammen mindestens 180° beträgt.6. Fuel injection valve according to claim 5, characterized in that the sum of the edge angle (γ) together is at least 180 °.
7. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Übergangsbereich (13) gegenüber einer Oberflächenebene (18) vertieft angeordnet ist. 7. Fuel injection valve according to one of claims 1 to 6, characterized in that the transition region (13) is recessed relative to a surface plane (18).
EP05738062A 2004-07-13 2005-05-02 Fuel injection valve Withdrawn EP1776522A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004033842A DE102004033842A1 (en) 2004-07-13 2004-07-13 Fuel injector
PCT/EP2005/051997 WO2006005640A1 (en) 2004-07-13 2005-05-02 Fuel injection valve

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EP1776522A1 true EP1776522A1 (en) 2007-04-25

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US (1) US20060231647A1 (en)
EP (1) EP1776522A1 (en)
JP (1) JP2008506879A (en)
DE (1) DE102004033842A1 (en)
WO (1) WO2006005640A1 (en)

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US20060231647A1 (en) 2006-10-19
WO2006005640A1 (en) 2006-01-19
JP2008506879A (en) 2008-03-06

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