EP2409012B1 - Apparatus for injecting fuel into the combustion chamber of an internal combustion engine - Google Patents

Apparatus for injecting fuel into the combustion chamber of an internal combustion engine Download PDF

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Publication number
EP2409012B1
EP2409012B1 EP10710156.0A EP10710156A EP2409012B1 EP 2409012 B1 EP2409012 B1 EP 2409012B1 EP 10710156 A EP10710156 A EP 10710156A EP 2409012 B1 EP2409012 B1 EP 2409012B1
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EP
European Patent Office
Prior art keywords
protective plate
armature
chamber
fuel
coil
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EP10710156.0A
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German (de)
French (fr)
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EP2409012A1 (en
Inventor
Franz Guggenbichler
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/08—Fuel-injection apparatus having special means for influencing magnetic flux, e.g. for shielding or guiding magnetic flux
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • F02M2200/9069—Non-magnetic metals

Definitions

  • the invention relates to a device for injecting fuel into the combustion chamber of an internal combustion engine comprising an injection nozzle with an axially displaceable nozzle needle, which can be acted upon to control its opening and closing movement of the pressure prevailing in a fuel-filled control chamber pressure in the axial direction is controlled in the control chamber via an at least one inlet or outlet channel for fuel opening or closing solenoid valve, in which a coil having a coil coil cooperates with an armature and the armature is pressed against a valve seat valve closure member, wherein the armature arranged in an armature space is, in which the inlet and outlet channel opens and the solenoid is covered on the armature space side of a metallic protective plate and wherein the protective plate is annular and in which the coil receiving annular cavity of Magnetventi Is arranged ls or the cavity covering.
  • servo-controlled injection injectors for internal combustion engines, in particular in common-rail injection systems, the control of the injection takes place with the aid of a solenoid valve.
  • the solenoid valve controls the outflow of fuel from the control chamber of an injection nozzle.
  • a servo-controlled injection injector according to the prior art is in Fig. 1 shown.
  • Fig. 1 shows the schematic structure of a modular common rail injection system. From the fuel tank 1 is with a Pre-feed pump 2 sucked fuel and brought from the high-pressure pump 3 to the required system pressure and fed to the injection injector 4.
  • the injector 4 consists of an injection nozzle 5, a throttle plate 6, a solenoid valve 7, a (not shown) with a high pressure accumulator equipped injector body 8 and a nozzle retaining nut 9, which holds the parts together.
  • the solenoid valve 7 In the idle state, the solenoid valve 7 is closed, so that high-pressure fuel from the high-pressure bore 10 via the transverse groove 11 and the inlet throttle 12 flows into the control chamber 13 of the nozzle 5, the outflow from the control chamber 13 via the outlet throttle 14 but is blocked on the valve seat 15 of the solenoid valve 7 , The voltage applied in the control chamber 13 system pressure presses together with the force of the nozzle spring 16, the nozzle needle 17 in the nozzle needle seat 18, so that the injection holes 24 are closed.
  • the solenoid valve 7 If the solenoid valve 7 is actuated by controlling the electromagnet and the solenoid valve member 27 is lifted against the force of the solenoid valve spring 26 from the valve seat 15, it releases the flow through the valve seat 15, and fuel flows from the control chamber 13 through the outlet throttle 14, the Solenoid valve armature chamber 19, the outlet column 20, the discharge hole 21 and the low-pressure bore 22 back into the fuel tank 1. It sets a defined by the flow cross-sections of inlet throttle 12 and outlet throttle 14 equilibrium pressure in the control chamber 13, which is so low that in the nozzle chamber 23rd applied system pressure in the nozzle body 29 longitudinally displaceable guided nozzle needle 17 is able to open, so that the injection holes 24 are released and the injection takes place.
  • the present invention now aims to avoid such damage due to cavitation erosion.
  • the injection device of the type mentioned is substantially further developed such that the annular protective plate is held in the cavity of the magnet pot by means of the protective plate cross tabs and the tongues are formed from the material of the magnet pot, preferably by pressing a projecting Teeth having caulking.
  • the armature space facing surface of the magnetic coil, ie, the cavitation exposed side of the solenoid is effectively protected by the arrangement of a metallic protective plate from damage.
  • the protective plate is of annular design and in which the annular cavity of the magnet pot or the cavity is arranged covering the coil.
  • the definition of the protective plate according to the invention is achieved in that the annular protective plate is contained in the cavity of the magnet pot with the aid of the protective plate cross tongues, the tongues are formed with advantage of the material of the magnet pot, preferably by pressing a projecting teeth having caulking.
  • a preferred development also provides that the protective plate is pressed into the magnet pot. This has the advantage of easy installation with sufficiently high holding power.
  • the inventive arrangement of a metallic protective plate naturally entails the risk that the operation of the electromagnet is impaired. In particular, it can lead to a disturbance of the magnetic field lines.
  • the protective plate consists of a metal which does not disturb the magnetic field lines, preferably of stainless steel.
  • FIG.2 a detailed view of an injection injector according to Fig. 1 who wears the protective plate, Figure 3 a known design and Figure 4 the inventive execution.
  • Fig.2 shows a known embodiment of a magnetic pot 25.
  • a metal plate 30 is mounted for protection, which is pressed at its side edges 31 in the magnet pot 25.
  • the metal plate 30 is preferably such that it does not disturb the structure of the magnetic field lines in the magnetic circuit, for example by using a stainless steel.
  • Figure 3 shows a known embodiment.
  • the metal disc 30 is welded at the locations 32 with the magnetic pot 25.
  • FIG. 4 shows the embodiment according to the invention.
  • the metal disk 30 is loosely inserted in the magnetic pot 25 in front of the magnetic coil 28 in a first step.
  • a caulking tool 33 which has teeth 34 protruding several times on the circumference, preferably six to eight times inside and outside the coil window, is caulked.

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

Description

Die Erfindung betrifft eine Vorrichtung zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine umfassend eine Einspritzdüse mit einer axial verschieblichen Düsennadel, welche zur Steuerung ihrer Öffnungs- und schließbewegung von dem in einem mit Kraftstoff gefüllten Steuerraum herrschenden Druck in axialer Richtung beaufschlagbar ist, wobei der Druck im Steuerraum über ein wenigstens einen Zu- oder Ablaufkanal für Kraftstoff öffnendes oder schließendes Magnetventil gesteuert wird, bei welchem eine einen Wicklungsträger aufweisende Spule mit einem Anker zusammenwirkt und mit dem Anker ein gegen einen Ventilsitz pressbares Ventilschließglied gekuppelt ist, wobei der Anker in einem Ankerraum angeordnet ist, in welchen der Zu- bzw. Ablaufkanal mündet und die Magnetspule ankerraumseitig von einer metallischen Schutzplatte abgedeckt ist und wobei die Schutzplatte ringförmig ausgebildet ist und in dem die Spule aufnehmenden ringförmigen Hohlraum des Magnetventils oder den Hohlraum abdeckend angeordnet ist.The invention relates to a device for injecting fuel into the combustion chamber of an internal combustion engine comprising an injection nozzle with an axially displaceable nozzle needle, which can be acted upon to control its opening and closing movement of the pressure prevailing in a fuel-filled control chamber pressure in the axial direction is controlled in the control chamber via an at least one inlet or outlet channel for fuel opening or closing solenoid valve, in which a coil having a coil coil cooperates with an armature and the armature is pressed against a valve seat valve closure member, wherein the armature arranged in an armature space is, in which the inlet and outlet channel opens and the solenoid is covered on the armature space side of a metallic protective plate and wherein the protective plate is annular and in which the coil receiving annular cavity of Magnetventi Is arranged ls or the cavity covering.

Eine derartige Vorrichtung ist der US 5 238 224 A zu entnehmen. Dem Dokument EP 1 967 726 A2 ist weiters eine Ausbildung zu entnehmen, bei der die Magnetspule ankerraumseitig nur von einer Platte abgedeckt ist, die nicht festgelegt ist und nur dazu dient, einen gewissen Restluftspalt zwischen Spule und Ankerplatte sicherzustellen.Such a device is the US 5 238 224 A refer to. The document EP 1 967 726 A2 Furthermore, it can be seen from an embodiment in which the solenoid coil is covered on the anchor chamber side only by a plate which is not fixed and only serves to ensure a certain residual air gap between the coil and anchor plate.

Bei servogesteuerten Einspritzinjektoren für Brennkraftmaschinen, insbesondere in Common-Rail Einspritzsystemen, erfolgt die Steuerung der Einspritzung mit Hilfe eines Magnetventils. Das Magnetventil steuert den Abfluss von Kraftstoff aus dem Steuerraum einer Einspritzdüse. Ein servogesteuerter Einspritzinjektor gemäß dem Stand der Technik ist in Fig. 1 dargestellt.In servo-controlled injection injectors for internal combustion engines, in particular in common-rail injection systems, the control of the injection takes place with the aid of a solenoid valve. The solenoid valve controls the outflow of fuel from the control chamber of an injection nozzle. A servo-controlled injection injector according to the prior art is in Fig. 1 shown.

Fig. 1 zeigt den schematischen Aufbau eines modularen Common-Rail-Einspritzsystems. Aus dem Kraftstofftank 1 wird mit einer Vorförderpumpe 2 Kraftstoff angesaugt und von der Hochdruckpumpe 3 auf den erforderlichen Systemdruck gebracht und dem Einspritzinjektor 4 zugeführt. Der Injektor 4 besteht aus einer Einspritzdüse 5, einer Drosselplatte 6, einem Magnetventil 7, einem mit einem Hochdruckspeicher (nicht dargestellt) ausgestatteten Injektorkörper 8 und einer Düsenspannmutter 9, die die Teile zusammenhält. Im Ruhezustand ist das Magnetventil 7 geschlossen, sodass Hochdruckkraftstoff aus der Hochdruckbohrung 10 über die Quernut 11 und die Zulaufdrossel 12 in den Steuerraum 13 der Düse 5 strömt, der Abfluss aus dem Steuerraum 13 über die Ablaufdrossel 14 aber am Ventilsitz 15 des Magnetventils 7 blockiert ist. Der im Steuerraum 13 anliegende Systemdruck drückt gemeinsam mit der Kraft der Düsenfeder 16 die Düsennadel 17 in den Düsennadelssitz 18, sodass die Spritzlöcher 24 verschlossen sind. Fig. 1 shows the schematic structure of a modular common rail injection system. From the fuel tank 1 is with a Pre-feed pump 2 sucked fuel and brought from the high-pressure pump 3 to the required system pressure and fed to the injection injector 4. The injector 4 consists of an injection nozzle 5, a throttle plate 6, a solenoid valve 7, a (not shown) with a high pressure accumulator equipped injector body 8 and a nozzle retaining nut 9, which holds the parts together. In the idle state, the solenoid valve 7 is closed, so that high-pressure fuel from the high-pressure bore 10 via the transverse groove 11 and the inlet throttle 12 flows into the control chamber 13 of the nozzle 5, the outflow from the control chamber 13 via the outlet throttle 14 but is blocked on the valve seat 15 of the solenoid valve 7 , The voltage applied in the control chamber 13 system pressure presses together with the force of the nozzle spring 16, the nozzle needle 17 in the nozzle needle seat 18, so that the injection holes 24 are closed.

Wird das Magnetventil 7 betätigt, indem der Elektromagnet angesteuert und das Magnetventilglied 27 gegen die Kraft der Magnetventilfeder 26 aus dem Ventilsitz 15 gehoben wird, gibt es den Durchfluss über den Ventilsitz 15 frei, und Kraftstoff strömt aus dem Steuerraum 13 durch die Ablaufdrossel 14, den Magnetventilankerraum 19, die Ablaufspalte 20, die Entlastungbohrung 21 und die Niederdruckbohrung 22 zurück in den Kraftstofftank 1. Es stellt sich ein durch die Strömungsquerschnitte von Zulaufdrossel 12 und Ablaufdrossel 14 definierter Gleichgewichtsdruck im Steuerraum 13 ein, der so gering ist, dass der im Düsenraum 23 anliegende Systemdruck die im Düsenkörper 29 längs verschieblich geführte Düsennadel 17 zu öffnen vermag, sodass die Spritzlöcher 24 freigegeben werden und die Einspritzung erfolgt.If the solenoid valve 7 is actuated by controlling the electromagnet and the solenoid valve member 27 is lifted against the force of the solenoid valve spring 26 from the valve seat 15, it releases the flow through the valve seat 15, and fuel flows from the control chamber 13 through the outlet throttle 14, the Solenoid valve armature chamber 19, the outlet column 20, the discharge hole 21 and the low-pressure bore 22 back into the fuel tank 1. It sets a defined by the flow cross-sections of inlet throttle 12 and outlet throttle 14 equilibrium pressure in the control chamber 13, which is so low that in the nozzle chamber 23rd applied system pressure in the nozzle body 29 longitudinally displaceable guided nozzle needle 17 is able to open, so that the injection holes 24 are released and the injection takes place.

Aufgrund der Geometrie des Magnetventils 7 steht die eigentliche Magnetspule 28 (bestehend aus einem Kunststoff-Wicklungsträger und den Kupferdrahtsindungen) in direktem Kontakt mit Kraftstoff, sodass bei Auftreten von Kavitation im System insbesondere bei Kunststoffbauteilen, wie sie für den Wicklungsträger der Magnetspule 28 verwendet werden, Schäden infolge Kavitationserosion auftreten können. Kavitation entsteht dabei folgendermaßen:

  • Bei geöffnetem Ventilsitz 15 liegt der Anker 27 direkt am Hubanachlag des Magnettopfes 25 auf, sodass nur mehr ein sehr kleiner Restluftspalt von 50 - 80 µm zwischen Anker 27 und Magnettopf 25 verbleibt. Wird der Magnet abgeschaltet, entsteht in diesem Restluftspalt infolge der Kraft der ventilfeder 26 ein derart starker Unterdruck, dass der im Restluftspalt vorhandene Kraftstoff für kurze Zeit zumindest teilweise verdampft. In weiterer Folge kommt es wieder zu einem Druckanstieg, sodass die Dampfblasen implodieren. Passiert dies an der Oberfläche des Wicklungsträgers der Magnetspule 28, kommt es dort zu Kavitationserosion, die bei langen Laufzeiten bis zu den Kupferwicklungen der Magnetspule 28 vordringen und diese schließlich zerstören kann, was zum Ausfall des Magnetventils 7 führt.
Due to the geometry of the solenoid valve 7, the actual magnet coil 28 (consisting of a plastic winding carrier and the copper wire threads) is in direct contact with fuel, so that when cavitation occurs in the system, in particular in plastic components, as used for the winding support of the solenoid 28, damage due to cavitation erosion. Cavitation arises as follows:
  • When the valve seat 15 is open, the armature 27 rests directly on the Hubanachlag of the magnetic pot 25, so that only a very small residual air gap of 50 - 80 microns between armature 27 and magnet pot 25 remains. If the magnet is switched off, such a strong negative pressure arises in this residual air gap as a result of the force of the valve spring 26 that the fuel present in the residual air gap at least partially evaporates for a short time. Subsequently, there is again a pressure increase, so that the steam bubbles implode. If this occurs on the surface of the winding support of the magnet coil 28, cavitation erosion occurs there, which, with long propagation times, can reach the copper windings of the magnet coil 28 and ultimately destroy them, which leads to failure of the magnet valve 7.

Die vorliegende Erfindung zielt nun darauf ab, derartige Schädigungen infolge von Kavitationserosion zu vermeiden.The present invention now aims to avoid such damage due to cavitation erosion.

Zur Lösung dieser Aufgabe ist die Einspritzvorrichtung der eingangs genannten Art im Wesentlichen derart weitergebildet, dass die ringförmige Schutzplatte in dem Hohlraum des Magnettopfes mit Hilfe von die Schutzplatte übergreifenden Zungen gehalten ist und die Zungen aus dem Material des Magnettopf geformt sind, vorzugsweise durch Aufdrücken eines vorspringende Zähne aufweisenden Verstemmwerkzeugs. Die dem Ankerraum zugewandte Fläche der Magnetspule, d.h. die der Kavitation ausgesetzte Seite der Magnetspule wird durch die Anordnung einer metallischen Schutzplatte wirksam vor einer Beschädigung geschützt. Durch diese baulich überaus einfach umzusetzende Maßnahme der Anordnung einer metallischen Schutzplatte gelingt es, Kavitationserosion am (Kunststoff-)Wicklungsträger wirkungsvoll zu verhindern, ohne dass am Wicklungsträger bauliche Änderungen oder Anpassungen oder Materialänderungen durchgeführt werden müssen. Dabei soll der Wicklungsträger selbst, insbesondere aber die Kupferwindungen der Spule des Magnetventils geschützt werden.To solve this problem, the injection device of the type mentioned is substantially further developed such that the annular protective plate is held in the cavity of the magnet pot by means of the protective plate cross tabs and the tongues are formed from the material of the magnet pot, preferably by pressing a projecting Teeth having caulking. The armature space facing surface of the magnetic coil, ie, the cavitation exposed side of the solenoid is effectively protected by the arrangement of a metallic protective plate from damage. By this structurally very simple measure to implement the arrangement of a metallic protective plate, it is possible to effectively prevent cavitation erosion on the (plastic) winding carrier without structural changes or adjustments or material changes having to be carried out on the winding carrier. In this case, the winding support itself, but in particular the copper turns of the coil of the solenoid valve should be protected.

Damit das Vorsehen der metallischen Schutzplatte eine möglichst geringe Gewichtserhöhung des Einspritzinjektors zur Folge hat, ist vorgesehen, dass die Schutzplatte ringförmig ausgebildet ist und in dem die Spule aufnehmenden ringförmigen Hohlraum des Magnettopfes oder den Hohlraum abdeckend angeordnet ist.In order for the provision of the metallic protective plate to result in the smallest possible increase in the weight of the injection injector, it is provided that the protective plate is of annular design and in which the annular cavity of the magnet pot or the cavity is arranged covering the coil.

Die Festlegung der Schutzplatte erfolgt erfindungsgemäß dadurch, dass die ringförmige Schutzplatte in dem Hohlraum des Magnettopfes mit Hilfe von die Schutzplatte übergreifenden Zungen gebalten ist, wobei die zungen mit vorteil aus dem Material des Magnettopfes geformt sind, vorzugsweise durch Aufdrücken eines vorspringende Zähne aufweisenden Verstemmwerkzeugs. Eine bevorzugte Weiterbildung sieht außerdem vor, dass die Schutzplatte in den Magnettopf eingepresst ist. Dies hat den Vorteil einer einfachen Montage bei gleichzeitig ausreichend hoher Haltekraft.The definition of the protective plate according to the invention is achieved in that the annular protective plate is contained in the cavity of the magnet pot with the aid of the protective plate cross tongues, the tongues are formed with advantage of the material of the magnet pot, preferably by pressing a projecting teeth having caulking. A preferred development also provides that the protective plate is pressed into the magnet pot. This has the advantage of easy installation with sufficiently high holding power.

Die erfindungsgemäße Anordnung einer metallischen Schutzplatte birgt naturgemäß die Gefahr, dass die Funktionsweise des Elektromagneten beeinträchtigt wird. Insbesondere kann es zu einer Störung der Magnetfeldlinien kommen. Um derartige negative Einflüsse zu verhindern, ist gemäß einer bevorzugten Ausbildung vorgesehen, dass die Schutzplatte aus einem die Magnetfeldlinien nicht störenden Metall, vorzugsweise aus nichtrostendem Stahl besteht.The inventive arrangement of a metallic protective plate naturally entails the risk that the operation of the electromagnet is impaired. In particular, it can lead to a disturbance of the magnetic field lines. In order to prevent such negative influences, it is provided according to a preferred embodiment that the protective plate consists of a metal which does not disturb the magnetic field lines, preferably of stainless steel.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. In dieser zeigen Fig.2 eine Detailansicht eines Einspritzinjektors gemäß Fig. 1, der die Schutzplatte trägt, Fig.3 eine bekannte Ausführung und Fig.4 die erfinderische Ausführung.The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. In this show Fig.2 a detailed view of an injection injector according to Fig. 1 who wears the protective plate, Figure 3 a known design and Figure 4 the inventive execution.

Fig.2 zeigt eine bekannte Ausführung eines Magnettopfes 25. Vor der eigentlichen Magnetspule 28 ist zum Schutz eine Metallplatte 30 angebracht, die an ihren Seitenkanten 31 in den Magnettopf 25 eingepresst ist. Die Metallplatte 30 ist vorzugsweise so beschaffen, dass sie den Aufbau der Magnetfeldlinien im Magnetkreis nicht stört, beispielsweise durch Verwendung eines nichtrostenden Edelstahls. Fig.2 shows a known embodiment of a magnetic pot 25. In front of the actual magnetic coil 28, a metal plate 30 is mounted for protection, which is pressed at its side edges 31 in the magnet pot 25. The metal plate 30 is preferably such that it does not disturb the structure of the magnetic field lines in the magnetic circuit, for example by using a stainless steel.

Fig.3 zeigt eine bekannte Ausführung. Die Metallscheibe 30 ist an den Stellen 32 mit dem Magnettopf 25 verschweißt. Figure 3 shows a known embodiment. The metal disc 30 is welded at the locations 32 with the magnetic pot 25.

Fig.4 zeigt die Ausführung gemäß der Erfindung. Die Metallscheibe 30 wird in einem ersten Schritt lose in den Magnettopf 25 vor der Magnetspule 28 eingelegt. In einem zweiten Schritt wird mit Hilfe eines Verstemmwerkzeugs 33, das mehrfach am Umfang, vorzugsweise sechs bis acht Mal innerhalb und außerhalb des Spulenfensters vorstehende Zähne 34 aufweist, verstemmt. Durch Aufpressen des Verstemmwerkzeugs 33 auf den Magnettopf 25 kommt es zu einer Verformung des Magnettopfs im Bereich der Polfläche und zur Bildung von Zungen 35, die das Herausfallen der Metallscheibe 30 verhindern und diese in ihrer Position festhalten. Figure 4 shows the embodiment according to the invention. The metal disk 30 is loosely inserted in the magnetic pot 25 in front of the magnetic coil 28 in a first step. In a second step, with the aid of a caulking tool 33, which has teeth 34 protruding several times on the circumference, preferably six to eight times inside and outside the coil window, is caulked. By pressing the caulking 33 on the magnet pot 25 there is a deformation of the magnet pot in the region of the pole face and the formation of tongues 35, which prevent the falling out of the metal disc 30 and hold them in their position.

Claims (3)

  1. An apparatus for injecting fuel into the combustion chamber of an internal combustion engine, including an injection nozzle having an axially displaceable nozzle needle (17) to which the pressure present in a control chamber (13) filled with fuel can be applied in the axial direction to control the opening and closing movements of said needle, wherein the pressure in the control chamber (13) is controlled via a solenoid valve (7) opening or closing at least one inlet or outlet duct (12, 14) for fuel and in which a magnetic coil (28) cooperates with an armature (27) and a valve-closing member that can be pressed against a valve seat (15) is coupled to the armature (27), said armature (27) being disposed in an armature chamber (19) into which the inlet or outlet duct (14) opens and said magnetic coil (28) being covered by a metal protective plate (30) on the side of the armature chamber (19), and wherein the protective plate (30) is designed to be annular and is arranged in the annular cavity of the solenoid valve (7) receiving the coil (28), or in a manner covering said cavity, characterized in that the annular protective plate (30) is held in the cavity of the magnet pot (25) by the aid of tongues (35) overlapping the protective plate (30) and the tongues (35) are formed of the material of the magnet pot (25), preferably by pressing on a caulking tool (33) including projecting teeth (34).
  2. An apparatus according to claim 1, characterized in that the protective plate (30) is pressed into the magnet pot (25).
  3. An apparatus according to claim 1 or 2, characterized in that the protective plate (30) is made of a metal that does not interfere with the magnetic field lines, preferably stainless steel.
EP10710156.0A 2009-03-17 2010-03-16 Apparatus for injecting fuel into the combustion chamber of an internal combustion engine Active EP2409012B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA425/2009A AT508049B1 (en) 2009-03-17 2009-03-17 DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE
PCT/AT2010/000079 WO2010105282A1 (en) 2009-03-17 2010-03-16 Apparatus for injecting fuel into the combustion chamber of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2409012A1 EP2409012A1 (en) 2012-01-25
EP2409012B1 true EP2409012B1 (en) 2014-04-30

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EP10710156.0A Active EP2409012B1 (en) 2009-03-17 2010-03-16 Apparatus for injecting fuel into the combustion chamber of an internal combustion engine

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US (1) US8839765B2 (en)
EP (1) EP2409012B1 (en)
JP (1) JP5296920B2 (en)
KR (1) KR101487696B1 (en)
CN (1) CN102388216B (en)
AT (1) AT508049B1 (en)
BR (1) BRPI1009127A2 (en)
RU (1) RU2496024C2 (en)
WO (1) WO2010105282A1 (en)

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Also Published As

Publication number Publication date
JP5296920B2 (en) 2013-09-25
KR101487696B1 (en) 2015-01-29
US8839765B2 (en) 2014-09-23
CN102388216A (en) 2012-03-21
AT508049B1 (en) 2016-01-15
BRPI1009127A2 (en) 2016-03-01
EP2409012A1 (en) 2012-01-25
WO2010105282A1 (en) 2010-09-23
KR20110128207A (en) 2011-11-28
RU2496024C2 (en) 2013-10-20
AT508049A1 (en) 2010-10-15
US20120006301A1 (en) 2012-01-12
JP2012520957A (en) 2012-09-10
RU2011141859A (en) 2013-04-27
CN102388216B (en) 2014-07-09

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