EP1332280B1 - Fuel injection valve and method for adjustment thereof - Google Patents

Fuel injection valve and method for adjustment thereof Download PDF

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Publication number
EP1332280B1
EP1332280B1 EP01962566A EP01962566A EP1332280B1 EP 1332280 B1 EP1332280 B1 EP 1332280B1 EP 01962566 A EP01962566 A EP 01962566A EP 01962566 A EP01962566 A EP 01962566A EP 1332280 B1 EP1332280 B1 EP 1332280B1
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EP
European Patent Office
Prior art keywords
fuel injection
sleeve
injection valve
adjusting
adjusting 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.)
Expired - Lifetime
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EP01962566A
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German (de)
French (fr)
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EP1332280A1 (en
Inventor
Heinz Luft
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664Injectors 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
    • F02M51/0671Injectors 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168Assembling; Disassembling; Manufacturing; Adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505Adjusting spring tension by sliding spring seats
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the invention relates to a fuel injection valve according to the preamble of independent claim 1 and a method for adjusting a fuel injection valve according to the preamble of independent claim 21.
  • a method for adjusting a fuel injection valve and a fuel injection valve is known.
  • a magnetically conductive material for example in the form of a powder, is introduced into a blind hole and the magnetic force varies until the measured actual flow rate of the medium coincides with the predetermined target amount.
  • a method for adjusting the dynamic medium flow rate of a fuel injection valve is known.
  • an adjustment of an adjustment takes place, which is arranged near the magnetic coil outside the medium flow path.
  • the size of the magnetic flux in the magnetic circuit and thus the magnetic force changes, so that the medium flow rate can be influenced and adjusted.
  • the adjustment can be done both wet and dry fuel injector.
  • a fuel injection valve or a method for adjusting the dynamic medium flow rate of a fuel injection valve is proposed in which a longitudinal slot having an adjusting sleeve is pressed to a predetermined press-in depth in a longitudinal bore of a connecting piece, the dynamic medium actual amount measured the valve and compared with a medium-target amount and the pressed-in, under a voltage acting in the radial direction adjusting sleeve is advanced until the measured actual amount of the medium matches the predetermined medium target amount.
  • a disadvantage of the group of mechanical adjustment methods is, in particular, the high degree of inaccuracy which these methods are subject to.
  • the opening and closing times of a fuel injection valve can be shortened only at the expense of the electric power, whereby the electrical load of the components increases and the control units are more stressed.
  • a fuel injection valve for fuel injection systems of internal combustion engines which is particularly suitable for injecting fuel into a suction pipe of an internal combustion engine.
  • the fuel injection valve has an electrically energizable actuator in the form of a solenoid coil, a solenoid connected to the solenoid and acted upon in a closing direction by a return spring valve needle for actuating a valve closing body, which forms a sealing seat together with a valve seat surface, and a sleeve which the return spring with a bias applied to.
  • the sleeve and the return spring are arranged in a flow bore of an inner pole.
  • the inner pole serves with its upstream inlet end as fuel inlet port of the fuel injection valve.
  • a fuel filter is inserted into the flow bore under radial pressure.
  • the fuel filter has at its end projecting into the fuel injection valve end a throttle body which is part of the plastic body of the fuel filter and projects into a longitudinal opening of the sleeve.
  • the throttle body forms an adjusting body which is adjustably arranged in the sleeve in the axial direction, so that a fuel quantity flowing through the fuel injection valve per unit time is dependent on the position of the adjusting body in the sleeve.
  • the fuel injection valve according to the invention with the features of claim 1 and the inventive method for adjusting the fuel injection valve having the features of claim 21 has the advantage that controlled by the introduction of an adjusting in a pressed-in the valve body sleeve in a simple mechanical way, the flow rate or can be adapted.
  • a particular advantage is that the adjustment of the flow can be done with already installed fuel injector.
  • the adjusting body is accessible from the outside at its end facing the fuel supply and can be arbitrarily moved in the sleeve after measurement of the actual amount by an adjusting bolt and pushed into the pinhole.
  • the pinhole, the cross section can be increased or decreased by the introduction of the adjusting body, is also used in standard fuel injection valves.
  • the setting of the adjusting body in the sleeve and the production of the adjusting body, the sleeve and the pinhole are possible on manufacturing technology easy way.
  • a further advantage is that the static and the dynamic flow can be set separately, so that the respective already preset flow rates are no longer changed by the other settings.
  • the fuel injection valve 1 is embodied in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is guided.
  • the valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has an injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic sheath 18, which may be molded on the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
  • armature 20 On the other side of the dial 15 is an armature 20. This is a non-positively connected via a flange 21 with the valve needle 3 in connection, which is connected by a weld 22 to the flange 21.
  • a return spring 23 On the flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
  • the armature 20 and the valve seat body 5 are fuel passages 30a to 30c, which conduct the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25, to the ejection opening 7.
  • the fuel injection valve 1 is connected by a seal 28 against a receiving bore, not shown, for. B. in a fuel rail, sealed.
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement. Upon energization of the solenoid coil 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, wherein the stroke is determined by a located in the rest position between the inner pole 12 and the armature 20 working gap 27.
  • the armature 20 takes the flange 21, which is welded to the valve needle 3, also in the stroke direction with.
  • the armature 20 falls after sufficient degradation of the magnetic field by the pressure of Return spring 23 from the inner pole 13, whereby the standing with the valve needle 3 in operative connection flange 21 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • FIG. 2 shows an excerpt from a sectional view of the detail of the fuel injection valve 1 designated II in FIG. 1.
  • the illustrated in Fig. 2 first embodiment of the fuel injection valve 1 according to the invention shows the inflow-side part of the fuel injection valve 1 without the filter element 25, which is shown in Fig. 1 in the central fuel supply 16. While in Fig. 1, only the sleeve 24 is shown, which is required for the adjustment of the so-called. Dynamic fuel flow, which is influenced by the opening and closing time, the embodiment shown in Fig. 2 additionally has an inserted into the sleeve 24 adjusting body 40, which is used for the adjustment of the so-called static fuel flow, ie the fuel flow in the open, static state.
  • the adjusting body 40 is cylindrical in the present embodiment and formed frustoconically tapered at a discharge end 41.
  • the sleeve 24 is closed at its discharge-side end 42 of a pinhole 43.
  • the pinhole 43 and the sleeve 24 may be integrally formed or made out as two different components.
  • the sleeve 24 and the pinhole 43 form an overall component.
  • the sleeve 24 has a side slit 44 extending to the pinhole 43.
  • the adjusting body 40 can be moved to control the static fuel flow by means of an adjusting bolt 45 in the sleeve 24 in Abspritzetti. It will the cone-shaped spray-discharge end 41 of the adjusting body 40 is displaced into the aperture plate 43. Depending on how far the discharge-side end 41 of the adjusting body 40 projects into a bore 46 of the perforated plate 43, the fuel flow through the fuel injection valve 1 decreases.
  • the dynamic fuel flow is determined by the position of the sleeve 24.
  • the static fuel flow which flows through the latter in the open state of the fuel injection valve 1, can be adjusted via the adjusting body 40.
  • the actual flow through the fuel injection valve 1 is first measured. The measured actual value is then compared with a predetermined target value of the flow. Then, the adjusting body 40 is displaced by the adjusting bolt 45 as long as in the sleeve 24 in Abspritzides until the actual value coincides with the desired value. Since the adjusting body 40 can no longer be pulled out of the sleeve 24, for this purpose, the fuel injection valve 1 must have a static flow, which is greater than the desired value before the adjustment of the static flow.
  • the adjusting bolt 45 is removed and instead the filter element 25, as shown in Fig. 1, inserted into the central recess 47 of the fuel injection valve 1.
  • Fig. 3 shows an excerpted sectional view of the designated in Fig. 1 with II detail of the fuel injection valve 1 in a second embodiment.
  • the second embodiment of the fuel injection valve 1 according to the invention differs from the first embodiment shown in Fig. 2 by the configuration of the adjusting body 40 as in the sleeve 24 screwed adjusting 40.
  • the adjusting body 40 is thus no longer pressed into the sleeve 24, but by means of a suitable adjusting tool 52, for example a screwdriver, screwed.
  • an inlet-side end 53 of the adjusting body 40 has a tool groove 54 in which a correspondingly shaped projection 55 of the adjusting tool 52 engages.
  • FIG. 4 shows a third exemplary embodiment of the fuel injection valve 1 according to the invention in the detail designated II in FIG. 1.
  • the sleeve 24 has no pinhole 43, but is designed as a hollow cylinder with a lateral slit 44.
  • the adjusting body 40 is cylindrical and has an axially extending groove 60 at its outer periphery.
  • the groove 60 may have different cross-sections and starts at the ejection-side end 41 of the adjusting body 40. It continues, thereby widening, to the inlet end 53 of the adjusting body 40 on.
  • the flow rate through the fuel injection valve 1 is in turn adjusted by a displacement of the adjusting body 40 in Abspritzides.
  • the flow rate increases with increasing depth of impression of the adjusting body 40 in the present embodiment.
  • This arrangement has the advantage that the flow rate need not be measured several times and compared with the target value, but the adjusting body 40 is continuously pushed so long in the sleeve 24 until the actual value of the fuel flow 1 with the target value matches.
  • FIGS. 5A-5C cross sections through the ejection-side end 41, 42 of the adjusting body 40 and the sleeve 24 are shown shown, wherein the sections are guided along the line VV.
  • the groove 60 is formed, through which the fuel flows in the direction of the valve seat.
  • the groove 60 may have different cross sections.
  • the groove 60 is U-shaped, while the embodiment shown in Fig. 5B is a C-shaped groove 60.
  • Fig. 5C Particularly easy to produce is the embodiment shown in Fig. 5C, which has a flat flattening 60 instead of the groove 60.
  • the adjusting body 40 thereby assumes the shape of a truncated cylinder.
  • FIG. 6A shows a fourth exemplary embodiment of the fuel injection valve 1 according to the invention.
  • the sleeve 24 has an external thread 57, which cooperates with an internal thread 58 of the central recess 47 of the fuel injection valve 1.
  • the sleeve 24 can thus be adjusted by turning by means of a suitable adjusting tool 56 in its position in the central recess 47 of the fuel injection valve 1.
  • the inlet-side end of the sleeve 24 in this case has a two-stage recess 59, the diameter of which tapers in two stages 61 and 62 in the direction of the fuel flow.
  • the sleeve 24 In the discharge direction, the sleeve 24 is supported on an intermediate sleeve 31, which is clamped between the sleeve 24 and the return spring 23. This results in that when screwing the sleeve 24, no rotational force is exerted on the return spring 23, whereby Abspanept and thereby caused contamination of the fuel injection valve 1 are prevented.
  • the dynamic fuel flow is, as already explained above, determined by the position of the sleeve 24.
  • the adjusting tool 56 which may be an Allen wrench for example, into the central recess 47 of the fuel injection valve 1
  • the tool 56 engages in the recess 59 of the sleeve 24 at the first stage 61.
  • the position of the adjusting body 40 located in the sleeve 24 is not affected by the screwing of the sleeve 24 by the adjusting tool 56.
  • the static fuel flow which flows through the latter in the open state of the fuel injection valve 1, can be adjusted via the adjusting body 40.
  • This second adjustment step is identical in the present embodiment with the process shown in FIG. 4. In this case, only the stepped recess 59 of the sleeve 24 is different, since the adjusting body 40 by the tool 45, which has a smaller diameter than the adjusting tool 56, is moved. The adjustment tool 45 thus acts on the second stage 62, without affecting the setting of the sleeve 24 in the recess 47 of the fuel injection valve 1.
  • the sleeve 24 with the external thread 57 can be combined with any adjusting body 40, in particular with the adjusting bodies 40 described in FIGS. 2 and 3.
  • any adjusting body 40 in particular with the adjusting bodies 40 described in FIGS. 2 and 3.
  • both the sleeve 24th and the adjusting body 40 can be varied in position by rotation by means of suitable adjusting tools 56 and 52.
  • the invention is not limited to the illustrated embodiments and for any designs of fuel injectors 1, z. B. also suitable for fuel injectors 1 with piezoelectric or magnetostrictive actuators or outward opening fuel injectors 1.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des unabhängigen Anspruchs 1 und einem Verfahren zur Einstellung eines Brennstoffeinspritzventils nach der Gattung des unabhängigen Anspruchs 21.The invention relates to a fuel injection valve according to the preamble of independent claim 1 and a method for adjusting a fuel injection valve according to the preamble of independent claim 21.

Aus der DE 40 23 828 A1 ist ein Verfahren zur Einstellung eines Brennstoffeinspritzventils sowie ein Brennstoffeinspritzventil bekannt. Zur Einstellung der während des Öffnungs- und des Schließvorganges abgegebenen Mediumströmungsmenge eines elektromagnetisch betätigbaren Brennstoffeinspritzventils wird in ein Sackloch ein die magnetischen Eigenschaften des Innenpols verändernder magnetisch leitfähiger Werkstoff beispielsweise in Form eines Pulvers eingebracht und damit die Magnetkraft variiert, bis die gemessene Ist-Durchflußmenge des Mediums mit der vorgegebenen Soll-Menge übereinstimmt.From DE 40 23 828 A1 a method for adjusting a fuel injection valve and a fuel injection valve is known. In order to adjust the amount of medium flow delivered by an electromagnetically operable fuel injection valve during the opening and closing operation, a magnetically conductive material, for example in the form of a powder, is introduced into a blind hole and the magnetic force varies until the measured actual flow rate of the medium coincides with the predetermined target amount.

In ähnlicher Weise wird in der DE 40 23 826 A1 vorgeschlagen, einen Abgleichbolzen in ein Sackloch eines Innenpols, der an seinem Umfang eine Ausnehmung hat, soweit einzuschieben und damit die Magnetkraft zu variieren, bis die gemessene Ist-Menge mit der vorgegebenen Soll-Menge übereinstimmt.Similarly, it is proposed in DE 40 23 826 A1, a tuning pin in a blind hole of an inner pole, which has a recess at its periphery, push so far and thus to vary the magnetic force until the measured actual quantity coincides with the specified target quantity.

Auch aus der DE 195 16 513 Al ist ein Verfahren zur Einstellung der dynamischen Mediumströmungsmenge eines Brennstoffeinspritzventils bekannt. Dabei findet eine Verstellung eines Einstellelements statt, das nahe der Magnetspule außerhalb des Mediumströmungsweges angeordnet ist. Dabei verändert sich die Größe des magnetischen Flusses im Magnetkreis und somit die Magnetkraft, so daß die Mediumströmungsmenge beeinflußbar und einstellbar ist. Die Einstellung kann dabei sowohl bei nassem als auch bei trockenem Brennstoffeinspritzventil erfolgen.From DE 195 16 513 Al a method for adjusting the dynamic medium flow rate of a fuel injection valve is known. In this case, an adjustment of an adjustment takes place, which is arranged near the magnetic coil outside the medium flow path. In this case, the size of the magnetic flux in the magnetic circuit and thus the magnetic force changes, so that the medium flow rate can be influenced and adjusted. The adjustment can be done both wet and dry fuel injector.

In der DE 42 11 723 Al wird ein Brennstoffeinspritzventil bzw. ein Verfahren zur Einstellung der dynamischen Mediumströmungsmenge eines Brennstoffeinspritzventils vorgeschlagen, bei dem eine einen Längsschlitz aufweisende Einstellhülse bis zu einer vorbestimmten Einpreßtiefe in eine Längsbohrung eines Anschlußstutzens eingepreßt wird, die dynamische Medium-Ist-Menge des Ventils gemessen und mit einer Medium-Soll-Menge verglichen und die eingepreßte, unter einer in radialer Richtung wirkenden Spannung stehende Einstellhülse soweit vorgeschoben wird, bis die gemessene Medium-Ist-Menge mit der vorgegebenen Medium-Soll-Menge übereinstimmt.In DE 42 11 723 Al a fuel injection valve or a method for adjusting the dynamic medium flow rate of a fuel injection valve is proposed in which a longitudinal slot having an adjusting sleeve is pressed to a predetermined press-in depth in a longitudinal bore of a connecting piece, the dynamic medium actual amount measured the valve and compared with a medium-target amount and the pressed-in, under a voltage acting in the radial direction adjusting sleeve is advanced until the measured actual amount of the medium matches the predetermined medium target amount.

In der DE 44 31 128 Al findet zur Einstellung der dynamischen Mediumströmungsmenge eines Brennstoffeinspritzventils eine Verformung des Ventilgehäuses durch den Eingriff eines Verformungswerkzeug am äußeren Umfang des Ventilgehäuses statt. Dabei verändert sich die Größe des Restluftspaltes zwischen Kern und Anker und somit die Magnetkraft, so daß die Mediumströmungsmenge beeinflußbar und einstellbar ist.In DE 44 31 128 Al takes place for adjusting the dynamic medium flow rate of a fuel injection valve, a deformation of the valve housing by the engagement of a deformation tool on the outer circumference of the valve housing. In this case, the size of the residual air gap between the core and armature and thus the magnetic force changes, so that the medium flow rate can be influenced and adjusted.

Nachteilig an der Gruppe der Verfahren, welche die Größe des magnetischen Flusses im Magnetkreis beeinflussen, ist insbesondere der hohe Aufwand bezüglich der Herstellungskosten, da die geforderten statischen Durchflußtoleranzen gewährleistet sein müssen, was jedoch schwierig zu realisieren ist. Insbesondere gestalten sich die Messungen der Magnetfelder aufwendig und erfordern zumeist kostenintensive Verfahren sowie ein Prüffeld.A disadvantage of the group of methods which influence the size of the magnetic flux in the magnetic circuit, in particular the high cost in terms of Production costs, since the required static flow tolerances must be ensured, but this is difficult to achieve. In particular, the measurements of the magnetic fields are complicated and usually require cost-intensive methods and a test field.

Nachteilig an der Gruppe der mechanischen Einstellverfahren ist insbesondere-die hohe Ungenauigkeit, der diese Verfahren unterliegen. Zudem sind die Öffnungs- und Schließzeiten eines Brennstoffeinspritzventils nur auf Kosten der elektrischen Leistung zu verkürzen, wodurch die elektrische Belastung der Komponenten zunimmt und die Steuergeräte stärker beansprucht werden.A disadvantage of the group of mechanical adjustment methods is, in particular, the high degree of inaccuracy which these methods are subject to. In addition, the opening and closing times of a fuel injection valve can be shortened only at the expense of the electric power, whereby the electrical load of the components increases and the control units are more stressed.

Insbesondere kann das aus der DE 44 31 128 A1 bekannte Verfahren, bei welchem der Restluftspalt zwischen Kern und Anker durch Verformung des Ventilgehäuses verändert wird, die Durchflußmenge nur sehr ungenau korrigieren, da Scherspannungen im Düsenkörper die Richtung und Größe der verformenden Kraft nachteilig beeinflussen können. Daher ist eine hohe Fertigungsgenauigkeit aller Teile nötig.In particular, the method known from DE 44 31 128 A1, in which the residual air gap between core and armature is changed by deformation of the valve housing, the flow rate correct only very inaccurate, since shear stresses in the nozzle body can adversely affect the direction and size of the deforming force. Therefore, a high manufacturing accuracy of all parts is necessary.

Aus der DE 41 23 787 A 1 ist bereits ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen bekannt, das sich insbesondere zum Einspritzen von Brennstoff in ein Saugrohr einer Brennkraftmaschine eignet. Das Brennstoffeinspritzventil weist einen elektrisch erregbaren Aktor in Form einer Magnetspule, eine mit der Magnetspule in Wirkverbindung stehende und in einer Schließrichtung von einer Rückstellfeder beaufschlagten Ventilnadel zur Betätigung eines Ventilschließkörpers, der zusammen mit einer Ventilsitzfläche einen Dichtsitz bildet, und eine Hülse, die die Rückstellfeder mit einer Vorspannung beaufschlagt, auf. Die Hülse sowie die Rückstellfeder sind in einer Strömungsbohrung eines Innenpols angeordnet. Der Innenpol dient mit seinem stromaufwärtigen zulaufseitigen Ende als Brennstoffeinlassstutzen des Brennstoffeinspritzventils. In diesem Bereich des als Brennstoffeinlassstutzen dienenden Innenpols ist ein Brennstofffilter in die Strömungsbohrung unter radialer Pressung eingeschoben. Der Brennstofffilter besitzt an seinem in das Brennstoffeinspritzventil ragenden Ende einen Drosselkörper, der Teil des Kunststoffgrundkörpers des Brennstofffilters ist und bis in eine Längsöffnung der Hülse hinein ragt. Der Drosselkörper bildet einen Einstellkörper, der in axialer Richtung in der Hülse verstellbar angeordnet ist, so dass eine das Brennstoffeinspritzventil pro Zeiteinheit durchströmende Brennstoffmenge von der Stellung des Einstellkörpers in der Hülse abhängig ist.From DE 41 23 787 A 1, a fuel injection valve for fuel injection systems of internal combustion engines is already known, which is particularly suitable for injecting fuel into a suction pipe of an internal combustion engine. The fuel injection valve has an electrically energizable actuator in the form of a solenoid coil, a solenoid connected to the solenoid and acted upon in a closing direction by a return spring valve needle for actuating a valve closing body, which forms a sealing seat together with a valve seat surface, and a sleeve which the return spring with a bias applied to. The sleeve and the return spring are arranged in a flow bore of an inner pole. The inner pole serves with its upstream inlet end as fuel inlet port of the fuel injection valve. In this area of the inner pole serving as a fuel inlet nozzle, a fuel filter is inserted into the flow bore under radial pressure. The fuel filter has at its end projecting into the fuel injection valve end a throttle body which is part of the plastic body of the fuel filter and projects into a longitudinal opening of the sleeve. The throttle body forms an adjusting body which is adjustably arranged in the sleeve in the axial direction, so that a fuel quantity flowing through the fuel injection valve per unit time is dependent on the position of the adjusting body in the sleeve.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 und das erfindungsgemäße Verfahren zum Einstellen des Brennstoffeinspritzventils mit den Merkmalen des Anspruchs 21 hat demgegenüber den Vorteil, daß durch die Einbringung eines Einstellkörpers in einer in den Ventilkörper eingepreßten Hülse auf einfachem mechanischen Weg die Durchflußmenge kontrolliert bzw. angepaßt werden kann.The fuel injection valve according to the invention with the features of claim 1 and the inventive method for adjusting the fuel injection valve having the features of claim 21 has the advantage that controlled by the introduction of an adjusting in a pressed-in the valve body sleeve in a simple mechanical way, the flow rate or can be adapted.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils und des in Anspruch 21 angegebenen Verfahrens möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in claim 1 and the method specified in claim 21 are possible.

Von Vorteil ist insbesondere, daß die Einstellung des Durchflusses bei bereits installiertem Brennstoffeinspritzventil erfolgen kann. Der Einstellkörper ist an seinem der Brennstoffzufuhr zugewandten Ende von außen zugänglich und kann nach Messung der Ist-Menge durch einen Einstellbolzen beliebig in der Hülse verschoben und in die Lochblende hineingeschoben werden.A particular advantage is that the adjustment of the flow can be done with already installed fuel injector. The adjusting body is accessible from the outside at its end facing the fuel supply and can be arbitrarily moved in the sleeve after measurement of the actual amount by an adjusting bolt and pushed into the pinhole.

Von Vorteil ist insbesondere auch die Ausgestaltung der Hülse mit einem Gewinde, welches mit einem auf dem Einstellkörper angebrachten Gewinde zusammenwirkt, wodurch der Einstellkörper in der eingestellten Position sehr gut fixiert werden kann. Zudem ist es möglich, den Einstellkörper wieder aus der Hülse herauszudrehen, um ihn z. B. auszutauschen.Of particular advantage is the design of the sleeve with a thread which cooperates with a mounted on the adjusting thread, whereby the adjusting body can be fixed very well in the set position. In addition, it is possible to turn the adjusting again out of the sleeve to him z. B. replace.

Die Lochblende, deren Querschnitt durch das Einbringen des Einstellkörpers vergrößert bzw. verkleinert werden kann, ist auch in serienmäßigen Brennstoffeinspritzventilen verwendbar. Die Einstellung des Einstellkörpers in der Hülse sowie die Herstellung des Einstellkörpers, der Hülse und der Lochblende sind auf fertigungstechnisch einfachem Wege möglich.The pinhole, the cross section can be increased or decreased by the introduction of the adjusting body, is also used in standard fuel injection valves. The setting of the adjusting body in the sleeve and the production of the adjusting body, the sleeve and the pinhole are possible on manufacturing technology easy way.

Von Vorteil ist weiterhin, daß der statische und der dynamische Durchfluß getrennt voneinander eingestellt werden können, so daß die jeweils bereits voreingestellten Durchflußmengen nicht mehr durch die weiteren Einstellungen verändert werden.A further advantage is that the static and the dynamic flow can be set separately, so that the respective already preset flow rates are no longer changed by the other settings.

Ebenfalls von Vorteil ist die Tatsache, daß andere Einstellungsmerkmale des Brennstoffeinspritzventils durch die Einstellung des Durchflusses über die Hülse und den Einstellkörper nicht beeinflußt werden.Also of advantage is the fact that other adjustment features of the fuel injector are unaffected by the adjustment of flow through the sleeve and adjuster body.

Zeichnungdrawing

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

Fig. 1
einen schematischen Schnitt durch ein Ausführungsbeispiel eines Brennstoffeinspritzventils gemäß dem Stand der Technik,
Fig. 2
einen auszugsweisen schematischen Schnitt durch ein erstes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1,
Fig. 3
einen auszugsweisen schematischen Schnitt durch ein zweites Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1,
Fig. 4
einen auszugsweisen schematischen Schnitt durch ein drittes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1,
Fig. 5A-C
auszugsweise schematische Querschnitte durch den inneren Teil des dritten Ausführungsbeispiels des erfindungsgemäßen Brennstoffeinspritzventils entlang der Linie V-V in Fig. 4 in verschiedenen Ausführungsformen,
Fig. 6A
einen auszugsweisen schematischen Schnitt durch ein viertes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1, und
Fig. 6B
eine Detaildarstellung des inneren Teils des vierten Ausführungsbeispiels des erfindungsgemäßen Brennstoffeinspritzventils.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
FIG. 2 shows a schematic section through an exemplary embodiment of a fuel injection valve according to the prior art, FIG.
Fig. 2
FIG. 1 shows an excerptional schematic section through a first exemplary embodiment of the fuel injection valve according to the invention in region II in FIG. 1, FIG.
Fig. 3
FIG. 1 is a partial schematic section through a second exemplary embodiment of the fuel injection valve according to the invention in region II in FIG. 1, FIG.
Fig. 4
FIG. 1 is a partial schematic section through a third exemplary embodiment of the fuel injection valve according to the invention in region II in FIG. 1, FIG.
Fig. 5A-C
FIG. 2 shows diagrammatic cross-sections through the inner part of the third exemplary embodiment of the fuel injection valve according to the invention along the line VV in FIG. 4 in various embodiments, FIG.
Fig. 6A
a partial schematic section through a fourth embodiment of the fuel injection valve according to the invention in area II in Fig. 1, and
Fig. 6B
a detailed view of the inner part of the fourth embodiment of the fuel injection valve according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Bevor anhand der Figuren 2 bis 5 drei Ausführungsbeispiele eines erfindungsgemäßen Brennstoffeinspritzventils näher beschrieben werden, soll zum besseren Verständnis der Erfindung zunächst anhand von Fig. 1 ein bereits bekanntes, abgesehen von den erfindungsgemäßen Maßnahmen zu den Ausführungsbeispielen baugleiches Brennstoffeinspritzventil bezüglich seiner wesentlichen' Bauteile kurz erläutert werden.Before describing three embodiments of a fuel injector according to the invention in more detail with reference to the figures 2 to 5, for better understanding of the invention will be explained briefly with reference to FIG. 1, an already known, apart from the inventive measures to the embodiments of the same fuel injector with respect to its essential 'components ,

Das Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.The fuel injection valve 1 is embodied in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines. The fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 geführt ist. Die Ventilnadel 3 steht in Wirkverbindung mit einem Ventilschließkörper 4, der mit einer auf einem Ventilsitzkörper 5 angeordneten Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brennstoffeinsprit zventil 1 handelt es sich im Ausführungsbeispiel um ein nach innen öffnendes Brennstoffeinspritzventil 1, welches über eine Abspritzöffnung 7 verfügt. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen den Außenpol 9 einer Magnetspule 10 abgedichtet. Die Magnetspule 10 ist in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und der Außenpol 9 sind durch einen Spalt 26 voneinander getrennt und stützen sich auf einem Verbindungsbauteil 29 ab. Die Magnetspule 10 wird über eine Leitung 19 von einem über einen elektrischen Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 ist von einer Kunststoffummantelung 18 umgeben, die am Innenpol 13 angespritzt sein kann.The fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is guided. The valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat. The fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has an injection opening 7. The nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a magnetic coil 10. The magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. The inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from. The magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current. The plug contact 17 is surrounded by a plastic sheath 18, which may be molded on the inner pole 13.

Die Ventilnadel 3 ist in einer Ventilnadelführung 14 geführt, welche scheibenförmig ausgeführt ist. Zur Hubeinstellung dient eine zugepaarte Einstellscheibe 15. An der anderen Seite der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, die durch eine Schweißnaht 22 mit dem Flansch 21 verbunden ist. Auf dem Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wird. In der Ventilnadelführung 14, im Anker 20 und am Ventilsitzkörper 5 verlaufen Brennstoffkanäle 30a bis 30c, die den Brennstoff, welcher über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert wird, zur Abspritzöffnung 7 leiten. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Aufnahmebohrung, z. B. in einem Fuel Rail, abgedichtet.The valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped. On the other side of the dial 15 is an armature 20. This is a non-positively connected via a flange 21 with the valve needle 3 in connection, which is connected by a weld 22 to the flange 21. On the flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias. In the valve needle guide 14, the armature 20 and the valve seat body 5 are fuel passages 30a to 30c, which conduct the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25, to the ejection opening 7. The fuel injection valve 1 is connected by a seal 28 against a receiving bore, not shown, for. B. in a fuel rail, sealed.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt, wobei der Hub durch einen in der Ruhestellung zwischen dem Innenpol 12 und dem Anker 20 befindlichen Arbeitsspalt 27 vorgegeben ist. Der Anker 20 nimmt den Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Wirkverbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche ab und Brennstoff wird über die Abspritzöffnung 7 abgespritzt.In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement. Upon energization of the solenoid coil 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, wherein the stroke is determined by a located in the rest position between the inner pole 12 and the armature 20 working gap 27. The armature 20 takes the flange 21, which is welded to the valve needle 3, also in the stroke direction with. The valve closing body 4, which is in operative connection with the valve needle 3, lifts off from the valve seat surface and fuel is sprayed off via the injection opening 7.

Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 vom Innenpol 13 ab, wodurch sich der mit der Ventilnadel 3 in Wirkverbindung stehende Flansch 21 entgegen der Hubrichtung bewegt. Die Ventilnadel 3 wird dadurch in die gleiche Richtung bewegt, wodurch der Ventilschließkörper 4 auf der Ventilsitzfläche 6 aufsetzt und das Brennstoffeinspritzventil 1 geschlossen wird.If the coil current is turned off, the armature 20 falls after sufficient degradation of the magnetic field by the pressure of Return spring 23 from the inner pole 13, whereby the standing with the valve needle 3 in operative connection flange 21 moves against the stroke direction. The valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.

Fig. 2 zeigt in einer auszugsweisen Schnittdarstellung das in Fig. 1 mit II bezeichnete Detail des Brennstoffeinspritzventils 1.2 shows an excerpt from a sectional view of the detail of the fuel injection valve 1 designated II in FIG. 1.

Das in Fig. 2 dargestellte erste Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1 zeigt den zulaufseitigen Teil des Brennstoffeinspritzventils 1 ohne das Filterelement 25, welches in Fig. 1 in der zentralen Brennstoffzufuhr 16 dargestellt ist. Während in Fig. 1 lediglich die Hülse 24 dargestellt ist, welche für die Einstellung des sog. dynamischen Brennstoffflusses benötigt wird, der durch die Öffnungs- und Schließzeit beeinflußt wird, weist das in Fig. 2 dargestellte Ausführungsbeispiel zusätzlich einen in die Hülse 24 eingesetzten Einstellkörper 40 auf, welcher für die Einstellung des sog. statischen Brennstoffflusses, also den Brennstofffluß im geöffneten, statischen Zustand, verwendet wird. Der Einstellkörper 40 ist im vorliegenden Ausführungsbeispiel zylinderförmig geformt und an einem abspritzseitigen Ende 41 kegelstumpfförmig verjüngend ausgebildet. Die Hülse 24 wird an ihrem abspritzseitigen Ende 42 von einer Lochblende 43 abgeschlossen. Die Lochblende 43 und die Hülse 24 können dabei einstückig ausgebildet oder als zwei verschiedene Bauteile ausgefertigt sein. Im vorliegenden Ausführungsbeispiel bilden die Hülse 24 und die Lochblende 43 ein Gesamtbauteil. Der leichteren Einbaubarkeit halber weist die Hülse 24 eine bis zur Lochblende 43 reichende seitliche Schlitzung 44 auf.The illustrated in Fig. 2 first embodiment of the fuel injection valve 1 according to the invention shows the inflow-side part of the fuel injection valve 1 without the filter element 25, which is shown in Fig. 1 in the central fuel supply 16. While in Fig. 1, only the sleeve 24 is shown, which is required for the adjustment of the so-called. Dynamic fuel flow, which is influenced by the opening and closing time, the embodiment shown in Fig. 2 additionally has an inserted into the sleeve 24 adjusting body 40, which is used for the adjustment of the so-called static fuel flow, ie the fuel flow in the open, static state. The adjusting body 40 is cylindrical in the present embodiment and formed frustoconically tapered at a discharge end 41. The sleeve 24 is closed at its discharge-side end 42 of a pinhole 43. The pinhole 43 and the sleeve 24 may be integrally formed or made out as two different components. In the present embodiment, the sleeve 24 and the pinhole 43 form an overall component. For ease of installation, the sleeve 24 has a side slit 44 extending to the pinhole 43.

Der Einstellkörper 40 kann zur Regelung des statischen Brennstoffflusses mittels eines Einstellbolzens 45 in der Hülse 24 in Abspritzrichtung verschoben werden. Dabei wird das konusförmige abspritzseitige Ende 41 des Einstellkörpers 40 in die Lochblende 43 verschoben. Je nachdem, wie weit das abspritzseitige Ende 41 des Einstellkörpers 40 in eine Bohrung 46 der Lochblende 43 hineinragt, nimmt der Brennstofffluß durch das Brennstoffeinspritzventil 1 ab.The adjusting body 40 can be moved to control the static fuel flow by means of an adjusting bolt 45 in the sleeve 24 in Abspritzrichtung. It will the cone-shaped spray-discharge end 41 of the adjusting body 40 is displaced into the aperture plate 43. Depending on how far the discharge-side end 41 of the adjusting body 40 projects into a bore 46 of the perforated plate 43, the fuel flow through the fuel injection valve 1 decreases.

Der dynamische Brennstofffluß ist durch die Position der Hülse 24 festgelegt. Je weiter die Hülse 24 durch ein geeignetes, hier nicht dargestelltes Werkzeug in eine zentrale Ausnehmung 47 der Brennstoffeinspritzventils 1 gepreßt wird, desto stärker ist die Vorspannung, mit der die Rückstellfeder 23 beaufschlagt wird, und desto länger dauert es, bis beim Öffnungsvorgang das Brennstoffeinspritzventil 1 geöffnet wird bzw. desto schneller kann beim Schließvorgang das Brennstoffeinspritzventil 1 geschlossen werden. Das bedeutet, daß mit zunehmender Vorspannung der Rückstellfeder 23 bzw. mit zunehmender Einbautiefe der Hülse 24 der dynamische Brennstofffluß durch das Brennstoffeinspritzventil 1 abnimmt.The dynamic fuel flow is determined by the position of the sleeve 24. The further the sleeve 24 is pressed by a suitable, not shown here tool in a central recess 47 of the fuel injection valve 1, the stronger the bias voltage, with which the return spring 23 is acted upon, and the longer it takes until the opening process, the fuel injection valve. 1 is opened or the faster the fuel injection valve 1 can be closed during the closing process. This means that with increasing bias of the return spring 23 and with increasing installation depth of the sleeve 24, the dynamic fuel flow through the fuel injection valve 1 decreases.

Ist die Hülse 24 in einer bestimmten gewünschten Position in die zentrale Ausnehmung 47 eingebracht, kann der statische Brennstofffluß, welcher im geöffnetem Zustand des Brennstoffeinspritzventils 1 durch dieses fließt, über den Einstellkörper 40 eingestellt werden. Um die richtige Durchflußmenge bzw. die korrekte Position des Einstellkörpers 40 in der Hülse 24 zu bestimmen, wird zunächst der Ist-Durchfluß durch das Brennstoffeinspritzventil 1 gemessen. Der gemessene Ist-Wert wird daraufhin mit einem vorgegebenen Soll-Wert des Durchflusses verglichen. Dann wird der Einstellkörper 40 durch den Einstellbolzen 45 solange in der Hülse 24 in Abspritzrichtung verschoben, bis der Ist-Wert mit dem Soll-Wert übereinstimmt. Da der Einstellkörper 40 nicht mehr aus der Hülse 24 herausgezogen werden kann, muß zu diesem Zweck das Brennstoffeinspritzventil 1 vor der Einstellung des statischen Durchflusses einen statischen Durchfluß aufweisen, der größer als der Soll-Wert ist.If the sleeve 24 is inserted in a certain desired position in the central recess 47, the static fuel flow, which flows through the latter in the open state of the fuel injection valve 1, can be adjusted via the adjusting body 40. In order to determine the correct flow rate or the correct position of the adjusting body 40 in the sleeve 24, the actual flow through the fuel injection valve 1 is first measured. The measured actual value is then compared with a predetermined target value of the flow. Then, the adjusting body 40 is displaced by the adjusting bolt 45 as long as in the sleeve 24 in Abspritzrichtung until the actual value coincides with the desired value. Since the adjusting body 40 can no longer be pulled out of the sleeve 24, for this purpose, the fuel injection valve 1 must have a static flow, which is greater than the desired value before the adjustment of the static flow.

Ist der Soll-Wert für den Durchfluß durch das Brennstoffeinspritzventil 1 erreicht, wird der Einstellbolzen 45 entfernt und statt dessen das Filterelement 25, wie in Fig. 1 dargestellt, in die zentrale Ausnehmung 47 des Brennstoffeinspritzventils 1 eingesetzt.If the desired value for the flow through the fuel injection valve 1 is reached, the adjusting bolt 45 is removed and instead the filter element 25, as shown in Fig. 1, inserted into the central recess 47 of the fuel injection valve 1.

Fig. 3 zeigt in einer auszugsweisen Schnittdarstellung das in Fig. 1 mit II bezeichnete Detail des Brennstoffeinspritzventils 1 in einem zweiten Ausführungsbeispiel.Fig. 3 shows an excerpted sectional view of the designated in Fig. 1 with II detail of the fuel injection valve 1 in a second embodiment.

Das zweite Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1 unterscheidet sich von dem in Fig.. 2 dargestellten ersten Ausführungsbeispiel durch die Ausgestaltung des Einstellkörpers 40 als in die Hülse 24 einschraubbarer Einstellkörper 40. Hierzu wird die Hülse 24 mit einem Innengewinde 51 sowie der Einstellkörper 40 mit einem Außengewinde 50 versehen. Der Einstellkörper 40 wird somit nicht mehr in die Hülse 24 hineingedrückt, sondern mittels eines geeigneten Einstellwerkzeugs 52, beispielsweise eines Schraubendrehers, eingeschraubt. Zu diesem Zweck weist ein zulaufseitiges Ende 53 des Einstellkörpers 40 eine Werkzeugnut 54 auf, in welche ein entsprechend gestalteter Vorsprung 55 des Einstellwerkzeugs 52 eingreift.The second embodiment of the fuel injection valve 1 according to the invention differs from the first embodiment shown in Fig. 2 by the configuration of the adjusting body 40 as in the sleeve 24 screwed adjusting 40. For this purpose, the sleeve 24 with an internal thread 51 and the adjusting body 40 with an external thread 50 provided. The adjusting body 40 is thus no longer pressed into the sleeve 24, but by means of a suitable adjusting tool 52, for example a screwdriver, screwed. For this purpose, an inlet-side end 53 of the adjusting body 40 has a tool groove 54 in which a correspondingly shaped projection 55 of the adjusting tool 52 engages.

Bei diesem Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1 ist es nicht notwendig, daß die Ist-Durchflußmenge des Brennstoffeinspritzventils 1 zu Beginn der Einstellung höher als die Soll-Durchflußmenge ist, da der Einstellkörper 40 durch das Außengewinde 50 und das Innengewinde 51 in eine beliebige Position in der Hülse 24 geschraubt werden kann.In this embodiment of the fuel injection valve 1 according to the invention, it is not necessary that the actual flow rate of the fuel injection valve 1 at the beginning of the setting is higher than the target flow rate, since the adjusting body 40 through the external thread 50 and the internal thread 51 in an arbitrary position in the Sleeve 24 can be screwed.

Fig. 4 zeigt ein drittes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1 in dem in Fig. 1 mit II bezeichneten Ausschnitt.FIG. 4 shows a third exemplary embodiment of the fuel injection valve 1 according to the invention in the detail designated II in FIG. 1.

Im vorliegenden Ausführungsbeispiel weist die Hülse 24 keine Lochblende 43 auf, sondern ist hohlzylindrisch mit einer seitlichen Schlitzung 44 ausgeführt. Der Einstellkörper 40 ist zylindrisch ausgebildet und weist an seinem äußeren Umfang eine axial verlaufende Nut 60 auf. Die Nut 60 kann dabei verschiedene Querschnitte aufweisen und beginnt am abspritzseitigen Ende 41 des Einstellkörpers 40. Sie setzt sich, sich dabei erweiternd, zum zulaufseitigen Ende 53 des Einstellkörpers 40 fort.In the present embodiment, the sleeve 24 has no pinhole 43, but is designed as a hollow cylinder with a lateral slit 44. The adjusting body 40 is cylindrical and has an axially extending groove 60 at its outer periphery. The groove 60 may have different cross-sections and starts at the ejection-side end 41 of the adjusting body 40. It continues, thereby widening, to the inlet end 53 of the adjusting body 40 on.

Die Durchflußmenge durch das Brennstoffeinspritzventil 1 wird wiederum durch eine Verschiebung des Einstellkörpers 40 in Abspritzrichtung eingestellt. Im Gegensatz zu den Ausführungsbeispielen in Fig. 2 und 3, wo mit zunehmender Einschraubtiefe bzw. Eindrucktiefe des Einstellkörpers 40 in der Hülse 24 der Brennstoffdurchfluß durch das Brennstoffeinspritzventil 1 abnimmt, nimmt im vorliegenden Ausführungsbeispiel die Durchflußmenge mit zunehmender Eindrucktiefe des Einstellkörpers 40 zu.The flow rate through the fuel injection valve 1 is in turn adjusted by a displacement of the adjusting body 40 in Abspritzrichtung. In contrast to the embodiments in FIGS. 2 and 3, where the fuel flow rate through the fuel injection valve 1 decreases with increasing depth of engagement or indentation of the adjusting body 40 in the sleeve 24, the flow rate increases with increasing depth of impression of the adjusting body 40 in the present embodiment.

Wenn der Einstellkörper 40 in die Hülse 24 eingesetzt wird und so weit hineingeschoben wird, daß das abspritzseitige Ende 41 des Einstellkörpers 40 und das abspritzseitige Ende 42 der Hülse 24 bündig miteinander abschließen, findet nur ein minimaler oder überhaupt kein Brennstoffdurchfluß durch das Brennstoffeinspritzventil 1 statt. Je weiter der Einstellkörper 40 in Abspritzrichtung durch die Hülse 24 gedrückt wird, desto größer wird der durch die Nut 60 freigegebene durchströmte Querschnitt.When the adjusting body 40 is inserted into the sleeve 24 and pushed so far that the discharge-side end 41 of the adjusting body 40 and the discharge-side end 42 of the sleeve 24 flush with each other, there is only a minimal or no fuel flow through the fuel injection valve 1. The farther the adjusting body 40 is pressed in the direction of ejection through the sleeve 24, the greater the cross-section through which the groove 60 is released.

Diese Anordnung hat den Vorteil, daß die Durchflußmenge nicht mehrfach gemessen und mit dem Soll-Wert verglichen werden muß, sondern der Einstellkörper 40 kontinuierlich so lange weiter in die Hülse 24 geschoben wird, bis der Ist-Wert des Brennstoffdurchflusses 1 mit dem Soll-Wert übereinstimmt.This arrangement has the advantage that the flow rate need not be measured several times and compared with the target value, but the adjusting body 40 is continuously pushed so long in the sleeve 24 until the actual value of the fuel flow 1 with the target value matches.

In Fig. 5A-5C sind Querschnitte durch das abspritzseitige Ende 41, 42 des Einstellkörpers 40 und der Hülse 24 dargestellt, wobei die Schnitte entlang der Linie V-V geführt sind. In dem Einstellkörper 40, welcher die Hülse 24 ausfüllt, ist die Nut 60 ausgebildet, durch welche der Brennstoff in Richtung Ventilsitz strömt.In FIGS. 5A-5C, cross sections through the ejection-side end 41, 42 of the adjusting body 40 and the sleeve 24 are shown shown, wherein the sections are guided along the line VV. In the adjusting body 40, which fills the sleeve 24, the groove 60 is formed, through which the fuel flows in the direction of the valve seat.

Die Nut 60 kann dabei verschiedene Querschnitte aufweisen. Im ersten Ausführungsbeispiel, welches in Fig. 5A dargestellt ist, ist die Nut 60 U-förmig ausgebildet, während das in Fig. 5B dargestellte Ausführungsbeispiel eine C-förmige Nut 60 darstellt.The groove 60 may have different cross sections. In the first embodiment, which is shown in Fig. 5A, the groove 60 is U-shaped, while the embodiment shown in Fig. 5B is a C-shaped groove 60.

Besonders einfach herstellbar ist das in Fig. 5C dargestellte Ausführungsbeispiel, welches anstelle der Nut 60 eine ebene Abflachung 60 aufweist. Der Einstellkörper 40 nimmt dadurch die Form eines angeschnittenen Zylinders an.Particularly easy to produce is the embodiment shown in Fig. 5C, which has a flat flattening 60 instead of the groove 60. The adjusting body 40 thereby assumes the shape of a truncated cylinder.

In Fig. 6A ist ein viertes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1 dargestellt. Im Unterschied zu den vorhergehenden Ausführungsbeispielen weist die Hülse 24 ein Außengewinde 57 auf, welches mit einem Innengewinde 58 der zentralen Ausnehmung 47 des Brennstoffeinspritzventils 1 zusammenwirkt. Die Hülse 24 kann somit durch Verdrehen mittels eines geeigneten Einstellwerkzeugs 56 in ihrer Position in der zentralen Ausnehmung 47 des Brennstoffeinspritzventils 1 eingestellt werden. Das zulaufseitige Ende der Hülse 24 weist dabei eine zweistufige Ausnehmung 59 auf, deren Durchmesser sich in zwei Stufen 61 und 62 in Richtung des Brennstoffflusses verjüngt.FIG. 6A shows a fourth exemplary embodiment of the fuel injection valve 1 according to the invention. In contrast to the preceding embodiments, the sleeve 24 has an external thread 57, which cooperates with an internal thread 58 of the central recess 47 of the fuel injection valve 1. The sleeve 24 can thus be adjusted by turning by means of a suitable adjusting tool 56 in its position in the central recess 47 of the fuel injection valve 1. The inlet-side end of the sleeve 24 in this case has a two-stage recess 59, the diameter of which tapers in two stages 61 and 62 in the direction of the fuel flow.

In Abspritzrichtung stützt sich die Hülse 24 an einer Zwischenhülse 31 ab, die zwischen der Hülse 24 und der Rückstellfeder 23 eingespannt ist. Dies führt dazu, daß beim Einschrauben der Hülse 24 keine Drehkraft auf die Rückstellfeder 23 ausgeübt wird, wodurch Abspanungen und dadurch verursachte Verunreinigungen des Brennstoffeinspritzventils 1 unterbunden werden.In the discharge direction, the sleeve 24 is supported on an intermediate sleeve 31, which is clamped between the sleeve 24 and the return spring 23. This results in that when screwing the sleeve 24, no rotational force is exerted on the return spring 23, whereby Abspanungen and thereby caused contamination of the fuel injection valve 1 are prevented.

Der dynamische Brennstofffluß ist, wie bereits weiter oben erläutert, durch die Position der Hülse 24 festgelegt. Je weiter also die Hülse 24 durch das Einstellwerkzeug 56, welches beispielsweise ein Inbusschlüssel sein kann, in die zentrale Ausnehmung 47 des Brennstoffeinspritzventils 1 gedreht wird, desto stärker ist die Vorspannung, mit der die Rückstellfeder 23 beaufschlagt wird, und desto länger dauert es, bis beim Öffnungsvorgang das Brennstoffeinspritzventil 1 geöffnet wird bzw. desto schneller kann beim Schließvorgang das Brennstoffeinspritzventil 1 geschlossen werden. Das bedeutet, daß mit zunehmender Vorspannung der Rückstellfeder 23 bzw. mit zunehmender Einbautiefe der Hülse 24 der dynamische Brennstofffluß durch das Brennstoffeinspritzventil 1 abnimmt. Das Werkzeug 56 greift dabei in der Ausnehmung 59 der Hülse 24 an der ersten Stufe 61 an. Die Position des in der Hülse 24 befindlichen Einstellkörpers 40 wird durch das Eindrehen der Hülse 24 durch das Einstellwerkzeug 56 nicht beeinflußt.The dynamic fuel flow is, as already explained above, determined by the position of the sleeve 24. Thus, the further the sleeve 24 is rotated by the adjusting tool 56, which may be an Allen wrench for example, into the central recess 47 of the fuel injection valve 1, the stronger the bias applied to the return spring 23 and the longer it takes to the fuel injection valve 1 is opened during the opening process or the faster the fuel injection valve 1 can be closed during the closing process. This means that with increasing bias of the return spring 23 and with increasing installation depth of the sleeve 24, the dynamic fuel flow through the fuel injection valve 1 decreases. The tool 56 engages in the recess 59 of the sleeve 24 at the first stage 61. The position of the adjusting body 40 located in the sleeve 24 is not affected by the screwing of the sleeve 24 by the adjusting tool 56.

Ist die Hülse 24 in einer bestimmten gewünschten Position in die zentrale Ausnehmung 47 eingebracht, kann der statische Brennstofffluß, welcher im geöffnetem Zustand des Brennstoffeinspritzventils 1 durch dieses fließt, über den Einstellkörper 40 eingestellt werden. Dieser zweite Einstellschritt ist im vorliegenden Ausführungsbeispiel mit dem in Fig. 4 dargestellten Vorgang identisch. Dabei ist lediglich die gestufte Ausnehmung 59 der Hülse 24 unterschiedlich, da der Einstellkörper 40 durch das Werkzeug 45, welches einen kleineren Durchmesser aufweist als das Einstellwerkzeug 56, verschoben wird. Das Einstellwerkzeug 45 greift somit an der zweiten Stufe 62 an, ohne die Einstellung der Hülse 24 in der Ausnehmung 47 des Brennstoffeinspritzventils 1 zu beeinflussen.If the sleeve 24 is inserted in a certain desired position in the central recess 47, the static fuel flow, which flows through the latter in the open state of the fuel injection valve 1, can be adjusted via the adjusting body 40. This second adjustment step is identical in the present embodiment with the process shown in FIG. 4. In this case, only the stepped recess 59 of the sleeve 24 is different, since the adjusting body 40 by the tool 45, which has a smaller diameter than the adjusting tool 56, is moved. The adjustment tool 45 thus acts on the second stage 62, without affecting the setting of the sleeve 24 in the recess 47 of the fuel injection valve 1.

Die Hülse 24 mit dem Außengewinde 57 kann mit jedem beliebigen Einstellkörper 40 kombiniert werden, insbesondere auch mit den in den Fig. 2 und 3 beschriebenen Einstellkörpern 40. So ist beispielsweise ein Ausführungsbeispiel möglich, bei welchem sowohl die Hülse 24 als auch der Einstellkörper 40 durch Verdrehen mittels geeigneter Einstellwerkzeuge 56 und 52 in ihrer Position variiert werden können.The sleeve 24 with the external thread 57 can be combined with any adjusting body 40, in particular with the adjusting bodies 40 described in FIGS. 2 and 3. Thus, for example, an embodiment is possible in which both the sleeve 24th and the adjusting body 40 can be varied in position by rotation by means of suitable adjusting tools 56 and 52.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und für beliebige Bauformen von Brennstoffeinspritzventilen 1, z. B. auch für Brennstoffeinspritzventile 1 mit piezoelektrischen oder magnetostriktiven Aktoren oder nach außen öffnende Brennstoffeinspritzventile 1 geeignet.The invention is not limited to the illustrated embodiments and for any designs of fuel injectors 1, z. B. also suitable for fuel injectors 1 with piezoelectric or magnetostrictive actuators or outward opening fuel injectors 1.

Claims (25)

  1. Fuel injection valve (1) for fuel injection systems of internal combustion engines, in particular for direct injection of fuel into the combustion chamber of an engine, with an actuator (10), a valve needle (3) which is mechanically linked to the actuator (10) and is acted upon by a restoring spring (23) in a closing direction, to actuate a valve closing body (4), which, together with a valve seat face (6), forms a sealing seat, and with a sleeve (24) which pre-stresses the restoring spring (23), an adjusting body (40) being adjustably arranged in the sleeve (24), so that an amount of fuel flowing through the fuel injection valve (1) per unit of time is dependent upon the position of the adjusting body (40) in the sleeve (24), characterized in that the adjusting body (40) is inserted in the sleeve (24) in direct contact with it.
  2. Fuel injection valve according to Claim 1, characterized in that the sleeve (24) is pushed into a central recess (47) in the fuel injection valve (1).
  3. Fuel injection valve according to Claim 1 or 2, characterized in that the restoring spring (23) is supported on an injection end (42) of the sleeve (24).
  4. Fuel injection valve according to Claim 2, characterized in that the position of the adjusting body (40) can be varied in the sleeve (24) by a first adjusting tool (45, 52).
  5. Fuel injection valve according to one of Claims 1 to 4, characterized in that an injection end (41) of the adjusting body (40) is conically formed.
  6. Fuel injection valve according to Claim 5, characterized in that the sleeve (24) has an aperture plate (43) at its injection end (42).
  7. Fuel injection valve according to Claim 6, characterized in that the conical end (41) of the adjusting body (40) projects into a borehole (46) in the aperture plate (43).
  8. Fuel injection valve according to one of Claims 1 to 7, characterized in that the sleeve (24) and the adjusting body (40) each have a thread (50, 51).
  9. Fuel injection valve according to Claim 8, characterized in that the position of the adjusting body (40) in the sleeve (24) can be varied by turning it by means of a first adjusting tool (52).
  10. Fuel injection valve according to one of Claims 1 to 4, characterized in that the adjusting body (40) is cylindrically formed.
  11. Fuel injection valve according to Claim 10, characterized in that the cylindrical adjusting body (40) has a groove (60) which extends in the axial direction in the outside wall of the adjusting body (40).
  12. Fuel injection valve according to Claim 11, characterized in that the radial extent of the groove (60) increases from the injection end (41) of the adjusting body (40) to an inlet end (53) of the adjusting body (40).
  13. Fuel injection valve according to Claim 12, characterized in that the groove (60) is formed in a U-shaped manner.
  14. Fuel injection valve according to Claim 12, characterized in that the groove (60) is formed in a C-shaped manner.
  15. Fuel injection valve according to Claim 10, characterized in that the cylindrical adjusting body (40) has a planar area (60) which extends in the axial direction on the outside wall of the adjusting body (40).
  16. Fuel injection valve according to Claim 4, characterized in that the sleeve (24) has an external thread (57) which cooperates with an internal thread (58) of the central recess (47) in the fuel injection valve (1) and is adjustable by a second adjusting tool (56).
  17. Fuel injection valve according to Claim 16, characterized in that the sleeve (24) has a recess (59) on the inlet side in which the first adjusting tool (45) and the second adjusting tool (56) are engaged.
  18. Fuel injection valve according to Claim 17, characterized in that the recess (59) on the inlet side is designed to have two steps, the second adjusting tool (56) being insertable up to a first step (61) and the first adjusting tool (45) being insertable up to a second step (62).
  19. Fuel injection valve according to one of Claims 1 to 18, characterized in that the sleeve (24) is supported on an intermediate sleeve (31).
  20. Fuel injection valve according to Claim 19, characterized in that the intermediate sleeve (31) is clamped between the sleeve (24) and the restoring spring (23).
  21. Method for adjusting a fuel injection valve (1) for fuel injection systems of internal combustion engines, in particular for direct injection of fuel into the combustion chamber of an engine, with an actuator (10), a valve needle (3) which is mechanically linked to the actuator (10) and is acted upon by a restoring spring (23) in a closing direction, to actuate a valve closing body (4), which, together with a valve seat face (6), forms a sealing seat, and with a sleeve (24) which pre-stresses the restoring spring (23), an adjusting body (40) being adjustably arranged in the sleeve (24), so that the fuel flow rate flowing through the fuel injection valve (1) per unit of time is dependent upon the position of the adjusting body (40) in the sleeve (24), and the adjusting body (40) being inserted in the sleeve (24) in direct contact with it, comprising the following steps:
    - measuring a static actual flow rate through the fuel injection valve (1);
    - comparing the measured actual flow rate with a static setpoint flow rate; and
    - adjusting the adjusting body (40) in the sleeve (24) until the actual flow rate corresponds to the static setpoint flow rate.
  22. Method according to Claim 21, characterized in that the adjusting body (40) is adjusted in the sleeve (24) by turning it by means of a first adjusting tool (52).
  23. Method according to Claim 21, characterized in that the adjusting body (40) is adjusted in the sleeve (24) by pressing it in by means of an adjusting bolt (45).
  24. Method according to one of Claims 21 to 23, characterized in that the adjustment of the static flow rate by means of the adjusting body (40) and the adjustment of a dynamic flow rate by axial displacement of the sleeve (24) are performed independently of one another.
  25. Method according to Claim 24, characterized in that the axial displacement of the sleeve (24) is performed by turning it with a second adjusting tool (56).
EP01962566A 2000-08-02 2001-07-18 Fuel injection valve and method for adjustment thereof Expired - Lifetime EP1332280B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10037571 2000-08-02
DE10037571A DE10037571A1 (en) 2000-08-02 2000-08-02 Fuel injector and method for adjusting it
PCT/DE2001/002705 WO2002010585A1 (en) 2000-08-02 2001-07-18 Fuel injection valve and method for adjustment thereof

Publications (2)

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EP1332280A1 EP1332280A1 (en) 2003-08-06
EP1332280B1 true EP1332280B1 (en) 2006-08-09

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EP01962566A Expired - Lifetime EP1332280B1 (en) 2000-08-02 2001-07-18 Fuel injection valve and method for adjustment thereof

Country Status (7)

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US (2) US7429007B2 (en)
EP (1) EP1332280B1 (en)
JP (1) JP4928049B2 (en)
CZ (1) CZ20021117A3 (en)
DE (2) DE10037571A1 (en)
ES (1) ES2271064T3 (en)
WO (1) WO2002010585A1 (en)

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Publication number Publication date
US7828233B2 (en) 2010-11-09
US20030094514A1 (en) 2003-05-22
ES2271064T3 (en) 2007-04-16
DE50110721D1 (en) 2006-09-21
WO2002010585A1 (en) 2002-02-07
JP4928049B2 (en) 2012-05-09
EP1332280A1 (en) 2003-08-06
JP2004505206A (en) 2004-02-19
CZ20021117A3 (en) 2003-09-17
DE10037571A1 (en) 2002-02-14
US20090078796A1 (en) 2009-03-26
US7429007B2 (en) 2008-09-30

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