EP0020888A1 - Fuel injection nozzle for internal-combustion engines - Google Patents

Fuel injection nozzle for internal-combustion engines Download PDF

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Publication number
EP0020888A1
EP0020888A1 EP80101801A EP80101801A EP0020888A1 EP 0020888 A1 EP0020888 A1 EP 0020888A1 EP 80101801 A EP80101801 A EP 80101801A EP 80101801 A EP80101801 A EP 80101801A EP 0020888 A1 EP0020888 A1 EP 0020888A1
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EP
European Patent Office
Prior art keywords
contact
injection nozzle
valve needle
compression spring
sleeve
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Granted
Application number
EP80101801A
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German (de)
French (fr)
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EP0020888B1 (en
Inventor
Gerhard Stumpp
Ewald Dr.-Ing. Eblen
Karl Hofmann
Nestor Rodriguez Amaya
Josef Schlagenhauf
Odon Kopsé
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0020888A1 publication Critical patent/EP0020888A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing

Definitions

  • the invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim.
  • a fuel injector for internal combustion engines according to the preamble of the main claim.
  • Such an injector is already known from DE-OS 27 39 628, in which the connector is connected to a measuring device to detect the electrical resistance between the nozzle needle and the valve seat and to indicate the movement of the nozzle needle relative to the valve seat.
  • the valve seat is grounded and the nozzle needle is connected to the positive pole of the vehicle electrical system, and the electrical connection of the connection piece with the nozzle needle takes place via the pressure body and the closing spring.
  • the fuel injector for internal combustion engines according to the invention with the characterizing features of the main claim has the advantage over the discussed prior art that the electrical connection between the nozzle needle and the connector is made safely and that series products can be designed as electrical switches without great effort, without the fuel is used to isolate the switch.
  • FIG. 1 shows the first exemplary embodiment
  • FIG. 2 shows the second exemplary embodiment in an axial section and on an enlarged scale.
  • the two fuel injection valves for internal combustion engines in FIGS. 1 and 2 are essentially made of electrically conductive materials and are rotationally symmetrical with respect to the valve axis 9. Both injection valves essentially consist of a nozzle holder 10, an adjoining intermediate plate 11 and a nozzle body 12, which are screwed axially by means of a union nut 13.
  • a valve needle 15 has a needle shaft 18 which slides in a guide bore 14 of the nozzle body 12, a sealing cone 17 which interacts with a valve seat 16 of the nozzle body 12 and a pressure pin 19 which bears continuously on a pressure pin 20.
  • a spring space 21 which is open at the end and has a shoulder 22 and a bore 23 are recessed, to which a recess 24 leading to the outside is continued.
  • a helical compression spring 25 is supported on the one hand via a spring adjusting washer 26 on the shoulder 22 and on the other hand via an insulation to be described on the pressure bolt 20.
  • the fuel reaches the inlet channels 29 to 32 and ring channels 33, 34, in a pressure chamber .27 of the nozzle body 12, which has a connection to a spray opening 28 via the valve seat 16.
  • a line element 40 made of electrically conductive materials has a contact pin 41 fastened in the bore 23 by means of an insulating sleeve 42, a contact spring 43 clamped onto the end section thereof and a contact cone 44 which is sprinkled therein. This lies in a depression 46 of a pressure bolt 45 non-positively, so that there is a permanent electrical contact between the two parts.
  • a guide surface 48 and a bearing surface 49 of the pressure pin 20 are coated with an insulation 47 made of abrasion-resistant material, so that the pressure spring 25 is electrically insulated from the pressure pin 20.
  • a connecting piece 50 is fastened via an insulating sleeve 51, the contact tongue 52 of which receives a line (not shown) of a test device and the end portion of a connecting line 54 is soldered into the eye 53 thereof; likewise the other end section of this connecting line is connected to the contact pin 41.
  • the needle shaft 18 of the valve needle 15 has an insulating layer 55 made of abrasion-resistant material, which slides in the guide bore 14 of the nozzle body 12.
  • the injector is screwed into the engine block, not shown, in its functional state and consequently has electrically conductive contact with the ground of the vehicle electrical system.
  • that of valve seat 16 and sealing cone 17 formed electrical switch closed, whereby a circuit between the nozzle body 12 and the test device, not shown, is also closed.
  • the electrical switch 16/17 When the injection nozzle is in the open state, the electrical switch 16/17 is open, and since the valve needle 15, the pressure pin 20, the contact pin 41 and the connector 50 have electrical insulation with respect to the nozzle body 12 and the nozzle holder 10, the current path now opens and therefore interrupts the electrical connection between the engine block and the test device.
  • the line element 60 of the injection valve in FIG. 2 is designed as a helical spring with two axial ends 61, 62 and is arranged to move freely within the compression spring 25.
  • the end 62 is non-positively supported in the trough 46 of the pressure pin 20, and the other end 61 is in a contact pin 64 which is stuck in the bore 23 by means of an insulating cap 65.
  • the connecting piece 66 is fastened via a sleeve 67 in the recess 24 of the nozzle holder 10, the plug 68 which is insulated from the sleeve 67 runs out into a contact tongue 69 which rests non-positively on a pin 70 of the contact bolt 64 and consequently establishes an electrical connection.
  • a sleeve 71 made of hardened steel consisting of a ring 72 and a collar 73 is glued to the pressure bolt 20 by means of an electrically insulating plastic layer 74 and forms the guide surface 48 and the bearing surface 49 for the compression spring 25.
  • a sleeve 75 made of hardened steel is glued to the needle shaft 18 of the valve needle 15 by means of an insulating layer 76 and slides in the guide bore 24 of the nozzle body 12.
  • the sealing cone 17 with the valve seat 16 forms the electrical switch and the interconnected parts between the sealing cone 17 and the plug 68 are electrically insulated from the cooperating housing parts, so that the current path between the valve seat 16 and the test device, not shown, through the opening and closing of the injection nozzle is also opened and closed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Es wird eine Kraftstoff-Einspritzdüse für Brennkraftmaschinen vorgeschlagen, bei der die Ventilnadel (15) mit dem Ventilsitz (16) des Düsenkörpers (12) einen elektrischen Schalter (16, 17) bilden, der durch sein Öffnen und Schliessen den Spritzbeginn und die Spritzdauer anzeigt. Ein federelastisches Leitungselement (40, 60) ist innerhalb der Schliessfeder (25) angeordnet und verbindet das Anschlussstück (50, 66) mit der Ventilnadel (15).A fuel injection nozzle for internal combustion engines is proposed, in which the valve needle (15) with the valve seat (16) of the nozzle body (12) form an electrical switch (16, 17) which, by opening and closing, indicates the start of injection and the duration of the injection . A resilient line element (40, 60) is arranged within the closing spring (25) and connects the connecting piece (50, 66) to the valve needle (15).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoff-Einspritzdüse für Brennkraftmaschinen nach der Gattung des Hauptanspruchs. Eine derartige Einspritzdüse ist bereits aus der DE-OS 27 39 628 bekannt, bei der das Anschlußstück an eine Meßeinrichtung angeschlossen ist, um den elektrischen Widerstand zwischen der Düsennadel und dem Ventilsitz zu erfassen und die Bewegung der Düsennadel gegenüber dem Ventilsitz anzuzeigen. Dabei liegt der Ventilsitz an Masse und die Düsennadel ist mit dem Pluspol des Bordnetzes verbunden,und die elektrische Verbindung des Anschlußstückes mit der Düsennadel erfolgt über den Druckkörper und die Schließfeder. Eine derartige Verbindung benötigt zwar wenig Konstruktionsteile, erfüllt jedoch in der Praxis nicht alle Forderungen, weil der Kraftstoffilm zwischen den Teilen als Isolierung verwendet wird.The invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim. Such an injector is already known from DE-OS 27 39 628, in which the connector is connected to a measuring device to detect the electrical resistance between the nozzle needle and the valve seat and to indicate the movement of the nozzle needle relative to the valve seat. The valve seat is grounded and the nozzle needle is connected to the positive pole of the vehicle electrical system, and the electrical connection of the connection piece with the nozzle needle takes place via the pressure body and the closing spring. Although such a connection requires few structural parts, in practice it does not meet all requirements because the fuel film between the parts is used as insulation.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoff-Einspritzdüse für Brennkraftmaschinen mit dem kennzeichnenden Merkmalen des Hauptanspruchs hat gegenüber dem erörterten Stand der Technik den Vorteil, daß die elektrische Verbindung zwischen der Düsennadel und dem Anschlußstück sicher erfolgt und daß Serienerzeugnisse sich ohne großen Aufwand als elektrischen Schalter ausbilden lassen, ohne daß der Kraftstoff zur Isolation des Schalters dient.The fuel injector for internal combustion engines according to the invention with the characterizing features of the main claim has the advantage over the discussed prior art that the electrical connection between the nozzle needle and the connector is made safely and that series products can be designed as electrical switches without great effort, without the fuel is used to isolate the switch.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Kraftstoff-Einspritzdüse möglich. Mit der Ausgestaltung der Einspritzdüse nach Anspruch 2 wird ein Normteil als Leitungselement verwendet. Mit der Ausgestaltung nach Anspruch 3 wird ein sicherwirkender, lösbarer Kontakt zwischen dem Anschlußstück und dem Kontaktbolzen geschaffen. Die Weiterbildung der Einspritzdüse nach Anspruch 4 gewährleistet eine sichere Kontaktierung des Leitungselementes am Druckbolzen auch unter erschwerten Betriebsbedingungen.Advantageous further developments and improvements of the fuel injection nozzle specified in the main claim are possible through the measures listed in the subclaims. With the configuration of the injection nozzle according to claim 2, a standard part is used as a line element. With the configuration according to claim 3, a safe, releasable contact between the connector and the contact pin is created. The development of the injection nozzle according to claim 4 ensures reliable contacting of the line element on the pressure pin even under difficult operating conditions.

Mit der Ausgestaltung der Einspritzdüse nach Anspruch 5, insbesondere jedoch nach Anspruch 6, wird eine fertigungstechnisch günstige Isolation der Düsennadel gegenüber dem Düsenkörper erreicht; dasgleiche erreicht man zwischen der Druckfeder und dem Druckbolzen mit der Weiterbildung der Einspritzdüse nach den Ansprüchen 7 und 8.With the configuration of the injection nozzle according to claim 5, but in particular according to claim 6, insulation of the nozzle needle with respect to the nozzle body which is favorable in terms of production technology is achieved; the same can be achieved between the compression spring and the pressure pin with the development of the injection nozzle according to claims 7 and 8.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in nachfolgender Beschreibung näher erläutert. Es zeigen jeweils in Axialschnitt und vergrößertem Maßstab Fig. 1 das erste Ausführungsbeispiel und Fig. 2 das zweite Ausführungsbeispiel.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows the first exemplary embodiment and FIG. 2 shows the second exemplary embodiment in an axial section and on an enlarged scale.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die beiden Kraftstoff-Einspritzventile für Brennkraftmaschinen in den Fig. 1 und 2 sind im wesentlichen aus elektrisch leitenden Materialien gefertigt und bezüglich der Ventilachse 9 rotationssymmetrisch. Beide Einspritzventile bestehen im wesentlichen aus einem Düsenhalter 10, einer sich anschließenden Zwischenplatte 11 und einem Düsenkörper 12, die mittels einer Überwurfmutter 13 axial verschraubt sind.The two fuel injection valves for internal combustion engines in FIGS. 1 and 2 are essentially made of electrically conductive materials and are rotationally symmetrical with respect to the valve axis 9. Both injection valves essentially consist of a nozzle holder 10, an adjoining intermediate plate 11 and a nozzle body 12, which are screwed axially by means of a union nut 13.

Eine Ventilnadel 15 hat einen in einer Führungsbohrung 14 des Düsenkörpers 12 gleitenden Nadelschaft 18, einen mit einem Ventilsitz 16 des Düsenkörpers 12 zusammenwirkenden Dichtkegel 17 und einen Druckzapfen 19, der an einem Druckbolzen 20 dauernd anliegt.A valve needle 15 has a needle shaft 18 which slides in a guide bore 14 of the nozzle body 12, a sealing cone 17 which interacts with a valve seat 16 of the nozzle body 12 and a pressure pin 19 which bears continuously on a pressure pin 20.

Im Düsenhalter 10 sind ein stirnseitig offener Federraum 21 mit einer Schulter 22 und eine Bohrung 23 ausgespart, an die sich eine nach außen führende Aussparung 24 fortsetzt. Eine Schraubendruckfeder 25 stützt sich zum einen über eine Federeinstellscheibe 26 an der Schulter 22 und zum andren über eine noch zu beschreibende Isolierung am Druckbolzen 20 ab. Der Kraftstoff gelangt über Zulaufkanäle 29 bis 32 und Ringkanäle 33, 34, in einen Druckraum .27 des Düsenkörpers 12, der über den Ventilsitz 16 Verbindung mit einer Spritzöffnung 28 hat.In the nozzle holder 10, a spring space 21 which is open at the end and has a shoulder 22 and a bore 23 are recessed, to which a recess 24 leading to the outside is continued. A helical compression spring 25 is supported on the one hand via a spring adjusting washer 26 on the shoulder 22 and on the other hand via an insulation to be described on the pressure bolt 20. The fuel reaches the inlet channels 29 to 32 and ring channels 33, 34, in a pressure chamber .27 of the nozzle body 12, which has a connection to a spray opening 28 via the valve seat 16.

In Fig. 1 hat ein aus elektrisch leitenden Werkstoffen hergestelltes Leitungselement 40 einen mittels einer Isolierhülse 42 in der Bohrung 23 befestigten Kontaktstift 41, eine auf dessen Endabschnitt geklemmte Kontaktfeder 43 und einen in dieser eingesprengten Kontaktkegel 44. Dieser liegt in einer Mulde 46 eines Druckbolzens 45 kraftschlüssig an, so daß ein dauernder elektrischer Kontakt zwischen beiden Teilen zustande kommt. Eine Führungsfläche 48 und eine Auflagefläche 49 des Druckbolzens 20 sind mit einer Isolierung 47 aus abriebfestem Werkstoff beschichtet, so daß die Druckfeder 25 gegenüber dem Druckbolzen 20 elektrisch isoliert ist.In Fig. 1, a line element 40 made of electrically conductive materials has a contact pin 41 fastened in the bore 23 by means of an insulating sleeve 42, a contact spring 43 clamped onto the end section thereof and a contact cone 44 which is sprinkled therein. This lies in a depression 46 of a pressure bolt 45 non-positively, so that there is a permanent electrical contact between the two parts. A guide surface 48 and a bearing surface 49 of the pressure pin 20 are coated with an insulation 47 made of abrasion-resistant material, so that the pressure spring 25 is electrically insulated from the pressure pin 20.

In der Aussparung 24 des Düsenhalters 10 ist über eine Isolierhülse 51 ein Anschlußstück 50 befestigt, dessen Kontaktzunge 52 eine nicht gezeichnete Leitung eines Testgerätes aufnimmt und in dessen Öse 53 der Endabschnitt einer Verbindungsleitung 54 eingelötet ist; ebenso ist der andere Endabschnitt dieser Verbindungsleitung mit dem Kontaktstift 41 verbunden. Der Nadelschaft 18 der Ventilnadel 15 hat eine aus abriebfestem Werkstoff bestehende Isolierschicht 55, die in der Führungsbohrung 14 des Düsenkörpers 12 gleitet.In the recess 24 of the nozzle holder 10, a connecting piece 50 is fastened via an insulating sleeve 51, the contact tongue 52 of which receives a line (not shown) of a test device and the end portion of a connecting line 54 is soldered into the eye 53 thereof; likewise the other end section of this connecting line is connected to the contact pin 41. The needle shaft 18 of the valve needle 15 has an insulating layer 55 made of abrasion-resistant material, which slides in the guide bore 14 of the nozzle body 12.

Das Einspritzventil ist in seinem Funktionszustand im nicht dargestellten Motorblock eingeschraubt und hat folglich elektrisch leitenden Kontakt mit Masse des Bordnetzes. Im gezeichneten Schließzustand ist der vom Ventilsitz 16 und Dichtkegel 17 gebildete elektrische Schalter geschlossen, wodurch ein Stromkreis zwischen dem Düsenkörper 12 und dem nicht gezeichneten Testgerät ebenfalls geschlossen ist.The injector is screwed into the engine block, not shown, in its functional state and consequently has electrically conductive contact with the ground of the vehicle electrical system. In the drawn closed state, that of valve seat 16 and sealing cone 17 formed electrical switch closed, whereby a circuit between the nozzle body 12 and the test device, not shown, is also closed.

Im öffnungszustand der Einspritzdüse ist der elektrische Schalter 16/17 geöffnet, und da die Ventilnadel 15, der Druckbolzen 20, der Kontaktstift 41 und das Anschlußstück 50 gegenüber dem Düsenkörper 12 und dem Düsenhalter 10 eine elektrische Isolierung aufweisen, öffnet der nunmehrige Strompfad und unterbricht mithin die elektrische Verbindung zwischen Motorblock und Testgerät.When the injection nozzle is in the open state, the electrical switch 16/17 is open, and since the valve needle 15, the pressure pin 20, the contact pin 41 and the connector 50 have electrical insulation with respect to the nozzle body 12 and the nozzle holder 10, the current path now opens and therefore interrupts the electrical connection between the engine block and the test device.

Das Leitungselement 60 des Einspritzventils in Fig. 2 ist als Schraubenfeder mit zwei axialen Enden 61, 62 ausgebildet und innerhalb der Druckfeder 25 frei beweglich angeordnet. Das Ende 62 stützt sich kraftschlüssig in der Mulde 46 des Druckbolzens 20 ab, und das andre Ende 61 steckt in einem Kontaktbolzen 64, der mittels einer Isolierkappe 65 in der Bohrung 23 festsitzt.The line element 60 of the injection valve in FIG. 2 is designed as a helical spring with two axial ends 61, 62 and is arranged to move freely within the compression spring 25. The end 62 is non-positively supported in the trough 46 of the pressure pin 20, and the other end 61 is in a contact pin 64 which is stuck in the bore 23 by means of an insulating cap 65.

Das Anschlußstück 66 ist über eine Hülse 67 in der Aussparung 24 des Düsenhalters 10 befestigt, dessen zur Hülse 67 isolierter Stecker 68 läuft in eine Kontaktzunge 69 aus, die kraftschlüssig an einem Zapfen 70 des Kontaktbolzens 64 anliegt und mithin eine elektrische Verbindung herstellt.The connecting piece 66 is fastened via a sleeve 67 in the recess 24 of the nozzle holder 10, the plug 68 which is insulated from the sleeve 67 runs out into a contact tongue 69 which rests non-positively on a pin 70 of the contact bolt 64 and consequently establishes an electrical connection.

Eine aus einem Ring 72 und einem Bund 73 bestehende Hülse 71 aus gehärtetem Stahl ist mittels einer elektrisch isolierenden Kunststoffschicht 74 am Druckbolzen 20 aufgeklebt und bildet die Führungsfläche 48 und die Auflagefläche 49 für die Druckfeder 25. Eine Hülse 75 aus gehärtetem Stahl ist mittels einer Isolierschicht 76 auf dem Nadelschaft 18 der Ventilnadel 15 aufgeklebt und gleitet in der Führungsbohrung 24 des Düsenkörpers 12.A sleeve 71 made of hardened steel consisting of a ring 72 and a collar 73 is glued to the pressure bolt 20 by means of an electrically insulating plastic layer 74 and forms the guide surface 48 and the bearing surface 49 for the compression spring 25. A sleeve 75 made of hardened steel is glued to the needle shaft 18 of the valve needle 15 by means of an insulating layer 76 and slides in the guide bore 24 of the nozzle body 12.

Auch in diesem zweiten Ausführungsbeispiel bildet der Dichtkegel 17 mit dem Ventilsitz 16 den elektrischen Schalter und die miteinander verbundenen Teile zwischen dem Dichtkegel 17 und dem Stecker 68 sind gegenüber den zusammenwirkenden Gehäuseteilen elektrisch isoliert, so daß der Strompfad zwischen Ventilsitz 16 und dem nicht dargestellten Testgerät durch das öffnen und Schließen der Einspritzdüse ebenfalls geöffnet und geschlossen wird.Also in this second embodiment, the sealing cone 17 with the valve seat 16 forms the electrical switch and the interconnected parts between the sealing cone 17 and the plug 68 are electrically insulated from the cooperating housing parts, so that the current path between the valve seat 16 and the test device, not shown, through the opening and closing of the injection nozzle is also opened and closed.

Claims (8)

1. Kraftstoff-Einspritzdüse für Brennkraftmaschinen mit einem Ventilsitz in einem Düsenkörper aus elektrisch leitendem Werkstoff; einer Ventilnadel aus elektrisch leitendem Werkstoff, die durch den Druck des Kraftstoffes gegen die Kraft einer Druckfeder vom Ventilsitz abhebt und die mit dem Ventilsitz einen elektrischen Schalter bildet; einem Druckbolzen, den die Druckfeder an die Ventilnadel gedrückt hält; einem elektrischen Anschlußstück, das in einem Düsenhalter isoliert befestigt und leitend mit der Ventilnadel verbunden ist, dadurch gekennzeichnet, daß die Verbindung des Anschlußstückes (50, 66) mit der Ventilnadel (15) ein axial federelastisches Leitungselement (40, 60) innerhalb der Druckfeder (25) bildet und daß das eine Ende des Leitungselementes unlösbar mit dem Anschlußstück verbunden ist, das andere Ende kraftschlüssig am Druckbolzen (20) anliegt.1. Fuel injection nozzle for internal combustion engines with a valve seat in a nozzle body made of electrically conductive material; a valve needle made of an electrically conductive material which lifts off the valve seat against the force of a compression spring due to the pressure of the fuel and which forms an electrical switch with the valve seat; a pressure pin which the compression spring holds pressed against the valve needle; an electrical connector, which is fastened in an insulated manner in a nozzle holder and is conductively connected to the valve needle, characterized in that the connection of the connector (50, 66) to the valve needle (15) is an axially resilient line element (40, 60) within the compression spring ( 25) forms and that one end of the line element is non-detachably connected to the connector, the other end is non-positively on the pressure pin (20). 2. Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß das Leitungselement (60) als Druckfeder mit zwei axial gerichteten Enden (61, 62) ausgebildet ist und daß das eine Ende (61) in einem im Düsenhalter (10) befestigten Kontaktbolzen (64) eingesteckt ist, der mit dem Anschlußstück (66) zusammenwirkt.2. Injection nozzle according to claim 1, characterized in that the line element (60) is designed as a compression spring with two axially directed ends (61, 62) and that one end (61) in a in the nozzle holder (10) attached contact pin (64) is inserted, which cooperates with the connector (66). 3. Einspritzdüse nach Anspruch 2, dadurch gekennzeichnet, daß das Anschlußstück (66) im Düsenhalter (10) isoliert befestigt ist und eine am Kontaktbolzen (64) anliegende Kontaktzunge (69) hat.3. Injection nozzle according to claim 2, characterized in that the connecting piece (66) in the nozzle holder (10) is fastened in an insulated manner and has a contact tongue (69) which bears against the contact bolt (64). 4. Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß das Leitungselement (40) aus einem Kontaktstift (41) mit einer Kontaktfeder (43) und einem Kontaktkegel (44) besteht und daß der Kontaktstift mit seinem einen Ende im Düsenhalter (10) isoliert befestigt ist und sein anderes Ende die Kontaktfeder (43) festhält, die den Kontaktkegel (44) aufnimmt.4. Injection nozzle according to claim 1, characterized in that the line element (40) consists of a contact pin (41) with a contact spring (43) and a contact cone (44) and that the contact pin is insulated with its one end in the nozzle holder (10) is and its other end holds the contact spring (43) which receives the contact cone (44). 5. Einspritzdüse nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß die Ventilnadel (15) oder Iso- die Führungsbohrung (14) des Düsenkörpers (12) eine Iso- lierschicht (76), vorzugsweise aus abriebfestem Kunststoff, aufweist, die mit der Führungsbohrung bzw. der Ventilnadel zusammenwirkt.5. injector as claimed in any one of the preceding claims, that the valve needle (15) or I s o the guide bore (14) of the nozzle body (12) an iso - lierschicht (76), preferably of abrasion-resistant plastic, which cooperate with the guide bore or the valve needle interacts. 6. Einspritzdüse nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß auf der Ventilnadel (15) eine Isolierschicht (55) und auf dieser eine Hülse (75), vorzugsweise aus gehärtetem Stahl, befestigt sind, und daß die Hülse in der Führungsbohrung (14) des Düsenkörpers (12) gleitet.6. Injection nozzle according to one of claims 1 to 4, characterized in that on the valve needle (15) an insulating layer (55) and on this a sleeve (75), preferably made of hardened steel, are attached, and that the sleeve in the guide bore (14) of the nozzle body (12) slides. 7. Einspritzdüse nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß der Druckbolzen (20) eine Auflagefläche (49) und eine Führungsfläche (48) für die Druckfeder (25) aufweist und daß beide Flächen mit einer Isolierung (47), vorzugsweise aus abriebfestem Kunststoff, beschichtet sind.7. Injection nozzle according to one of the preceding claims, characterized in that the pressure pin (20) has a bearing surface (49) and a guide surface (48) for the compression spring (25) and that both surfaces with insulation (47), preferably made of abrasion-resistant Plastic, are coated. 8. Einspritzdüse nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine aus einem Bund (73) und einem Ring (72) bestehende Hülse (71) vorzugsweise aus gehärtetem Stahl, eine Auflagefläche (49) und eine Führungsfläche (48) für die Druckfeder (25) bilden und daß die Hülse (71) auf dem Druckbolzen (20) mittels einer isolierenden Kunststoffschicht (74) aufgeklebt ist.8. Injection nozzle according to one of claims 1 to 6, characterized in that a sleeve (71) consisting of a collar (73) and a ring (72) preferably made of hardened steel, a bearing surface (49) and a guide surface (48) for form the compression spring (25) and that the sleeve (71) is glued to the pressure bolt (20) by means of an insulating plastic layer (74).
EP80101801A 1979-06-22 1980-04-03 Fuel injection nozzle for internal-combustion engines Expired EP0020888B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2925187A DE2925187A1 (en) 1979-06-22 1979-06-22 FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE2925187 1979-06-22

Publications (2)

Publication Number Publication Date
EP0020888A1 true EP0020888A1 (en) 1981-01-07
EP0020888B1 EP0020888B1 (en) 1983-10-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101801A Expired EP0020888B1 (en) 1979-06-22 1980-04-03 Fuel injection nozzle for internal-combustion engines

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US (1) US4340181A (en)
EP (1) EP0020888B1 (en)
JP (2) JPS566063A (en)
DE (2) DE2925187A1 (en)

Cited By (6)

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GB2153907A (en) * 1983-12-14 1985-08-29 Diesel Kiki Co Solenoid valve constituting an on-off switch
GB2154658A (en) * 1984-02-28 1985-09-11 Diesel Kiki Co Valve unit including a switch
EP0101822B1 (en) * 1982-08-05 1987-10-28 Robert Bosch Gmbh Fuel injector for an internal-combustion engine
WO1992005363A1 (en) * 1990-09-18 1992-04-02 Lucas Industries Public Limited Company Fuel injection nozzles
WO2005010335A2 (en) * 2003-07-23 2005-02-03 Siemens Aktiengesellschaft Circuit and method for operating an injector assembly, and injector
WO2005080786A1 (en) * 2004-02-11 2005-09-01 Siemens Aktiengesellschaft Contact element for the valve needle of an injector for internal combustion engines

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DE3029721A1 (en) * 1980-08-06 1982-03-04 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES
DE3117779A1 (en) * 1981-05-06 1982-11-25 Robert Bosch Gmbh, 7000 Stuttgart "FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES"
DE3125884A1 (en) * 1981-07-01 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
JPS5833773U (en) * 1981-08-31 1983-03-04 トヨタ自動車株式会社 Diesel engine fuel injection timing measuring device
US4625918A (en) * 1983-07-29 1986-12-02 Diesel Kiki Co., Ltd. Fuel injection valve
AU5270490A (en) * 1989-03-07 1990-10-09 Karl Holm An atomizing nozzle device for atomizing a fluid and an inhaler
DE19523243B4 (en) * 1995-06-27 2009-04-02 Robert Bosch Gmbh Fuel injection valve for internal combustion engines with a clamping nut with a conically formed annular shoulder
DE19652719A1 (en) * 1996-12-18 1998-06-25 Daimler Benz Ag Device for determining the opening and closing times of a valve
JP4587156B2 (en) * 2000-08-21 2010-11-24 ボルボ ラストバグナー アーベー Needle position detector
DE102004015745A1 (en) * 2004-03-31 2005-10-13 Robert Bosch Gmbh Device for injecting fuel into the combustion chamber of an internal combustion engine with a Nadelhubsensor
US7497203B2 (en) * 2005-08-03 2009-03-03 Caterpillar Inc. Avoidance of spark damage on valve members
GB2547684A (en) * 2016-02-26 2017-08-30 Delphi Int Operations Luxembourg Sarl Fuel injector for a combustion engine

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US3942366A (en) * 1973-02-02 1976-03-09 Robert Bosch Gmbh Fuel injection arrangement
US4066059A (en) * 1976-01-02 1978-01-03 Texaco Inc. Fuel injection nozzle valve and ignition system
DE2748447A1 (en) * 1976-11-08 1978-05-11 Gen Motors Corp IGNITION SYSTEM FOR EXTERNAL-IGNITION INJECTION COMBUSTION MACHINES

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101822B1 (en) * 1982-08-05 1987-10-28 Robert Bosch Gmbh Fuel injector for an internal-combustion engine
GB2153907A (en) * 1983-12-14 1985-08-29 Diesel Kiki Co Solenoid valve constituting an on-off switch
GB2154658A (en) * 1984-02-28 1985-09-11 Diesel Kiki Co Valve unit including a switch
WO1992005363A1 (en) * 1990-09-18 1992-04-02 Lucas Industries Public Limited Company Fuel injection nozzles
WO2005010335A2 (en) * 2003-07-23 2005-02-03 Siemens Aktiengesellschaft Circuit and method for operating an injector assembly, and injector
WO2005010335A3 (en) * 2003-07-23 2005-06-09 Siemens Ag Circuit and method for operating an injector assembly, and injector
WO2005080786A1 (en) * 2004-02-11 2005-09-01 Siemens Aktiengesellschaft Contact element for the valve needle of an injector for internal combustion engines

Also Published As

Publication number Publication date
JPH037572Y2 (en) 1991-02-25
DE2925187A1 (en) 1981-01-08
JPS566063A (en) 1981-01-22
EP0020888B1 (en) 1983-10-12
DE3065240D1 (en) 1983-11-17
JPH02131073U (en) 1990-10-30
US4340181A (en) 1982-07-20

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