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EP0225487B1 - Fuel injection nozzle for self-igniting internal-combustion engines in particular - Google Patents

Fuel injection nozzle for self-igniting internal-combustion engines in particular Download PDF

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Publication number
EP0225487B1
EP0225487B1 EP86115429A EP86115429A EP0225487B1 EP 0225487 B1 EP0225487 B1 EP 0225487B1 EP 86115429 A EP86115429 A EP 86115429A EP 86115429 A EP86115429 A EP 86115429A EP 0225487 B1 EP0225487 B1 EP 0225487B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
protective cap
injection nozzle
engine casing
nozzle holder
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
Application number
EP86115429A
Other languages
German (de)
French (fr)
Other versions
EP0225487A1 (en
Inventor
Karl Hofmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0225487A1 publication Critical patent/EP0225487A1/en
Application granted granted Critical
Publication of EP0225487B1 publication Critical patent/EP0225487B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • the housing parts of the injection nozzle protruding from the mounting hole in the machine housing usually a nozzle holder receiving the closing spring and a union nut which clamps a nozzle body receiving the valve needle against the nozzle holder (GB-A 2 062 101), are generally provided with a bonding layer as standard , which in some applications does not prevent surface corrosion of these parts.
  • An improved surface protection for example by galvanizing or painting the parts, raises u. U. significant problems and expensive parts.
  • the arrangement according to the invention with the characterizing features of the main claim solves the corrosion problem with simple and inexpensive means and also has the advantage that the protective cap can serve as an information carrier for the injection nozzle.
  • the protective cap can be color-coded and include the lettering for the nozzle half combination. The lettering can be injected, printed or applied to the protective cap by hot stamping.
  • the multi-part housing of which consists of a nozzle holder, a nozzle body and a union nut which excites the nozzle body against the nozzle holder
  • the protective cap only surrounds the part of the nozzle holder which is not covered by the union nut.
  • a protective cap designed in this way does not hinder the installation and removal of the injection nozzle, so that it does not have to be removed during assembly.
  • the protective cap is an integrated part of the nozzle holder combination, which, once blown open, always remains on the nozzle holder and can also be used for its unmistakable identification during storage.
  • FIG. 1 shows a partial section through a built-in injection nozzle according to the first embodiment
  • FIG. 2 shows a partial view of an injection nozzle according to the second embodiment.
  • the injection nozzle according to FIG. 1 has a nozzle holder 10 to which an intermediate disk 14 and a nozzle body (not visible in the drawing) are clamped by means of a union nut 12.
  • a valve needle is slidably mounted in the nozzle body, on which a closing spring 16 accommodated in the nozzle holder 10 acts via a pressure piece 18.
  • the nozzle holder 10 has a threaded connector 20 for connecting a fuel line, from which a channel 22 leads into a pressure chamber in the nozzle body.
  • the nozzle holder 10 is further provided with a hexagon 24, above which the nozzle holder 10 has a section 25 with a cylindrical outer surface.
  • the union nut 12 is also provided with a hexagon 30 and also with an external thread 32 with which the complete nozzle holder combination is screwed into the housing 34, 36 of an internal combustion engine.
  • a protective cap 40 is attached to the nozzle holder 10, which is designed as a rigid plastic part and surrounds the parts of the nozzle holder combination that protrude from the housing part 34, namely the nozzle holder 10 and part of the union nut 12.
  • the protective cap 40 is provided at the top with two wall sections 43 forming a neck part 42, which engage behind the lower annular shoulder of the threaded connector 20 and are separated from one another by two radial slots 44 which are offset by 180 ° , both of which are penetrated by a leakage oil tube 28 each.
  • a cylindrical section of the protective cap 40 adjoins the wall sections 43 and is guided on the cylindrical section 25 of the nozzle holder 10.
  • the cylindrical section 46 merges at an annular shoulder 50 into a section 52 surrounding the hexagon 24 of the nozzle holder 10 and then into a section 54 surrounding the hexagon 30 of the union nut 12, which section is extended into an enlarged bore section 56 of the housing part 34.
  • the annular shoulder 50 of the protective cap 40 is seated on the transition groove between the cylindrical section 25 and the hexagon 24 of the nozzle holder 10 and limits the insertion depth of the protective cap 40.
  • the protective cap 40 covers the parts of the nozzle holder combination that protrude outward from the housing 34, 36 of the internal combustion engine practically except for the threaded connector 20, so that additional operations for the surface treatment of these parts are unnecessary.
  • the protective cap 40 is fitted onto the nozzle holder 10 after the assembly of the nozzle holder combination, the two wall sections 43 of the neck part 42 separated by the radial slots 44 resiliently latching behind the threaded connector 20 when the annular shoulder 50 comes to rest axially on the nozzle holder 10.
  • the protective cap 40 To remove the injection nozzle from the housing 34, 36, the protective cap 40 must be removed, which is not a problem due to the spring elasticity of the neck part 42.
  • a protective cap 60 is provided, which only overlaps regions of a nozzle holder 62 that are not covered by the union nut 12.
  • the protective cap 60 has a cylindrical section 66 which engages over the hexagon 24 of the nozzle holder 62.
  • the cylindrical section 66 merges at an annular shoulder 68 into an upwardly conically tapered section 70, which surrounds the section 64 of the nozzle holder 62 in the correct shape.
  • the section 70 is divided into two resilient wall sections 74 by two upwardly open cutouts 72, which engage behind the lower annular shoulder of the threaded connector 20.
  • the recesses 72 are so wide that they allow free access to the drain oil tubes 28.
  • the annular shoulder 68 together with an axial shoulder of the nozzle holder 62, delimits the axial insertion depth of the protective cap 60 at the transition between the section 64 and the hexagon 24.
  • the protective cap 60 is also provided with inscriptions 76, 78 for identifying the injection nozzle, which are applied to the protective cap in a suitable manner.
  • This measure which can also be provided in the embodiment according to FIG. 1, eliminates color markings or inscriptions on the nozzle body 62 or 10 produced by rolling in.

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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)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoff-Einspritzdüse nach der Gattung des Hauptanspruchs. Die aus der Einbaubohrung im Maschinengehäuse herausragenden Gehäuseteile der Einspritzdüse, in der Regel ein die Schließfeder aufnehmender Düsenhalter und eine Überwurfmutter, die einen die Ventilnadel aufnehmenden Düsenkörper gegen den Düsenhalter spannt (GB-A 2 062 101), sind im allgemeinen serienmäßig mit einer Bonderschicht versehen, die in manchen Anwendungsfällen eine Oberflächenkorrosion dieser Teile nicht verhindert. Ein verbesserter Oberflächenschutz, beispielsweise durch Verzinken oder Lackieren der Teile, wirft in der Fertigung u. U. erhebliche Probleme auf und verteuert die Teile. Bei Einspritzdüsen mit einem Leckölanschluß ist es bekannt, eine den Leckölanschluß umschließende Schutzkappe aus einem elastomeren Stoff vorzusehen, deren Kappenrand über einen mit dem Maschinengehäuse fest verbundenen, die Einbauöffnung umgebenden Ringkragen gespannt ist (DE 25 27 347 A1). Diese Ausführung erfordert eine umständliche Handhabung beim Ein-und Ausbauen der Einspritzdüse oder wenn allein der Leckölanschluß hergestellt bzw. gelöst werden soll.The invention relates to a fuel injection nozzle according to the preamble of the main claim. The housing parts of the injection nozzle protruding from the mounting hole in the machine housing, usually a nozzle holder receiving the closing spring and a union nut which clamps a nozzle body receiving the valve needle against the nozzle holder (GB-A 2 062 101), are generally provided with a bonding layer as standard , which in some applications does not prevent surface corrosion of these parts. An improved surface protection, for example by galvanizing or painting the parts, raises u. U. significant problems and expensive parts. In the case of injection nozzles with a leakage oil connection, it is known to provide a protective cap which surrounds the leakage oil connection and is made of an elastomeric material, the edge of which is stretched over an annular collar which is firmly connected to the machine housing and surrounds the installation opening (DE 25 27 347 A1). This design requires cumbersome handling when installing and removing the injection nozzle or when only the leak oil connection is to be made or released.

Bei Einspritzdüsen mit einem seitlich am Düsengehäuse vorgesehenen Gewindestutzen für den Anschluß einer Kraftstoffzuleitung und mit einer zentralen Einstellvorrichtung für die Schließfederkraft und den Ventilnadelhub ist es bekannt, die Einstellvorrichtung durch eine auf das Düsengehäuse unter Zwischenschaltung eines Dichtelementes aufgeschraubte dickwandige und daher starre Schutzkappe abzudecken, die auf ihrer vom Maschinengehäuse abgekehrten Seite mit einem Gewindestutzen für den Anschluß einer Leckölleitung versehen ist (US-A 3 159 350). Bei einer ähnlichen Ausführung einer Einspritzdüse ist es bekannt, eine zentrale Einstellvorrichtung für die Schließfederkraft durch eine Kunststoffkappe vollständig zu umschließen, die am Düsengehäuse lösbar befestigt ist (DE-A 2 027 696).In the case of injection nozzles with a threaded connector provided on the side of the nozzle housing for connecting a fuel supply line and with a central adjusting device for the closing spring force and the valve needle lift, it is known to cover the adjusting device by a thick-walled and therefore rigid protective cap screwed onto the nozzle housing with the interposition of a sealing element its side facing away from the machine housing is provided with a threaded connector for connecting a leak oil line (US-A 3 159 350). In a similar embodiment of an injection nozzle, it is known to completely enclose a central adjusting device for the closing spring force by means of a plastic cap which is detachably fastened to the nozzle housing (DE-A 2 027 696).

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs löst demgegenüber das Korrosionsproblem mit einfachen und billigen Mitteln und hat darüberhinaus den Vorteil, daß die Schutzkappe als Informationsträger für die Einspritzdüse dienen kann. Zu diesem Zweck kann die Schutzkappe eine Farbkennzeichnung haben und die Beschriftung für die Düsenhalberkombination aufnehmen. Die Beschriftung kann eingespritzt, aufgedruckt oder durch Warmprägen an der Schutzkappe angebracht sein.The arrangement according to the invention with the characterizing features of the main claim solves the corrosion problem with simple and inexpensive means and also has the advantage that the protective cap can serve as an information carrier for the injection nozzle. For this purpose, the protective cap can be color-coded and include the lettering for the nozzle half combination. The lettering can be injected, printed or applied to the protective cap by hot stamping.

Weitere vorteilhafte Ausgestaltungen der Anordnung nach dem Hauptanspruch gehen aus den Unteransprüchen hervor. Bei Einspritzdüsen, deren mehrteiliges Gehäuse aus einem Düsenhalter, einem Düsenkörper und eine den Düsenkörper gegen den Düsenhalter spannende Überwurfmutter besteht, ist es besonders vorteilhaft, wenn die Schutzkappe nur den von der Überwurfmutter nicht bedeckten Teil des Düsenhalters umschließt. Eine derart ausgebildete Schutzkappe behindert nicht das Ein- und Ausbauen der Einspritzdüse, so daß sie bei der Montage nicht entfernt werden muß. Die Schutzkappe ist in diesem Fall eine integriertes Teil der Düsenhalterkombination, das, einmal aufgesprengt, stets auf dem Düsenhalter verbleibt und auch zu dessen unverwechselbaren Kennzeichnung bei der Lagerhaltung dienen kann.Further advantageous embodiments of the arrangement according to the main claim emerge from the subclaims. In the case of injection nozzles, the multi-part housing of which consists of a nozzle holder, a nozzle body and a union nut which excites the nozzle body against the nozzle holder, it is particularly advantageous if the protective cap only surrounds the part of the nozzle holder which is not covered by the union nut. A protective cap designed in this way does not hinder the installation and removal of the injection nozzle, so that it does not have to be removed during assembly. In this case, the protective cap is an integrated part of the nozzle holder combination, which, once blown open, always remains on the nozzle holder and can also be used for its unmistakable identification during storage.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Teilschnitt durch eine eingebaute Einspritzdüse nach dem ersten Ausführungsbeispiel und Figur 2 eine Teilansicht einer Einspritzdüse nach dem zweiten Ausführungsbeispiel.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows a partial section through a built-in injection nozzle according to the first embodiment and FIG. 2 shows a partial view of an injection nozzle according to the second embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Einspritzdüse nach Figur 1 hat einen Düsenhalter 10, an welchem mittels einer Überwurfmutter 12 eine Zwischenscheibe 14 und ein in der Zeichnung nicht sichtbarer Düsenkörper festgespannt sind. Im Düsenkörper ist wie üblich eine Ventilnadel verschiebbar gelagert, auf die eine im Düsenhalter 10 untergebrachte Schließfeder 16 über ein Druckstück 18 einwirkt. Der Düsenhalter 10 hat einen Gewindestutzen 20 zum Anschluß einer Kraftstoffleitung, von welchem ein Kanal 22 in einen Druckraum im Düsenkörper führt. Der Düsenhalter 10 ist ferner mit einem Sechskant 24 versehen, oberhalb welchem der Düsenhalter 10 einen Abschnitt 25 mit zylindrischer Mantelfläche aufweist. Dieser ist mit zwei sich diametral gegenüberliegenden taschenartigen Vertiefungen 26 versehen, in welchen je ein Leckölröhrchen 28 zum Anschluß einer Leckölleitung angeordnet ist. Die Überwurfmutter 12 ist ebenfalls mit einem Sechskant 30 und ferner mit einem Außengewinde 32 versehen, mit welchem die vollständige Düsenhalterkombination in das Gehäuse 34, 36 einer Brennkraftmaschine eingeschraubt ist.The injection nozzle according to FIG. 1 has a nozzle holder 10 to which an intermediate disk 14 and a nozzle body (not visible in the drawing) are clamped by means of a union nut 12. As usual, a valve needle is slidably mounted in the nozzle body, on which a closing spring 16 accommodated in the nozzle holder 10 acts via a pressure piece 18. The nozzle holder 10 has a threaded connector 20 for connecting a fuel line, from which a channel 22 leads into a pressure chamber in the nozzle body. The nozzle holder 10 is further provided with a hexagon 24, above which the nozzle holder 10 has a section 25 with a cylindrical outer surface. This is provided with two diametrically opposed pocket-like depressions 26, in each of which a leak oil tube 28 is arranged for connecting a leak oil line. The union nut 12 is also provided with a hexagon 30 and also with an external thread 32 with which the complete nozzle holder combination is screwed into the housing 34, 36 of an internal combustion engine.

Auf den Düsenhalter 10 ist eine Schutzkappe 40 aufgesteckt, welche als eigensteifes Kunststoffteil ausgebildet ist und die aus dem Gehäuseteil 34 herausragenden Teile der Düsenhalterkombination, nämlich den Düsenhalter 10 und einen Teil der Überwurfmutter 12, schützend umgibt. Die Schutzkappe 40 ist oben mit zwei einen Halsteil 42 bildenden Wandabschnitten 43 versehen, welche hinter die untere Ringschulter des Gewindestutzens 20 greifen und durch zwei um 180° zueinander versetzte Radialschlitze 44 voneinander getrennt sind, die beide von je einem Leckölröhrchen 28 durchsetzt sind.A protective cap 40 is attached to the nozzle holder 10, which is designed as a rigid plastic part and surrounds the parts of the nozzle holder combination that protrude from the housing part 34, namely the nozzle holder 10 and part of the union nut 12. The protective cap 40 is provided at the top with two wall sections 43 forming a neck part 42, which engage behind the lower annular shoulder of the threaded connector 20 and are separated from one another by two radial slots 44 which are offset by 180 ° , both of which are penetrated by a leakage oil tube 28 each.

An die Wandabschnitte 43 schließt sich ein zylindrischer Abschnitt der Schutzkappe 40 an, welcher auf dem zylindrischen Abschnitt 25 des Düsenhalters 10 geführt ist. Der zylindrische Abschnitt 46 geht an einer Ringschulter 50 in einen den Sechskant 24 des Düsenhalters 10 umgebenden Abschnitt 52 und danach in einen den Sechskant 30 der Überwurfmutter 12 umgebenden Abschnitt 54 über, der in einen erweiterten Bohrungsabschnitt 56 des Gehäuseteils 34 hinein verlängert ist. Die Ringschulter 50 der Schutzkappe 40 sitzt auf der Übergangskehle zwischen dem zylindrischen Abschnitt 25 und dem Sechskant 24 des Düsenhalters 10 auf und begrenzt die Aufstecktiefe der Schutzkappe 40.A cylindrical section of the protective cap 40 adjoins the wall sections 43 and is guided on the cylindrical section 25 of the nozzle holder 10. The cylindrical section 46 merges at an annular shoulder 50 into a section 52 surrounding the hexagon 24 of the nozzle holder 10 and then into a section 54 surrounding the hexagon 30 of the union nut 12, which section is extended into an enlarged bore section 56 of the housing part 34. The annular shoulder 50 of the protective cap 40 is seated on the transition groove between the cylindrical section 25 and the hexagon 24 of the nozzle holder 10 and limits the insertion depth of the protective cap 40.

Die Schutzkappe 40 deckt die aus dem Gehäuse 34, 36 der Brennkraftmaschine nach außen herausragenden Teile der Düsenhalterkonibination praktisch bis auf den Gewindestutzen 20 ab, so daß sich zusätzliche Arbeitsgänge zur Oberflächenbehandlung dieser Teile erübrigen. Die Schutzkappe 40 wird nach der Montage der Düsenhalterkombination auf den Düsenhalter 10 aufgesteckt, wobei die zwei durch die Radialschlitze 44 vineinander getrennten Wandabschnitte 43 des Halsteils 42 federnd hinter den Gewindestutzen 20 rasten, wenn die Ringschulter 50 zur axialen Anlage an den Düsenhalter 10 kommt. Zum Ausbauen der Einspritzdüse aus dem Gehäuse 34, 36 muß die Schutzkappe 40 entfernt werden, was durch die Federelastizität des Halsteils 42 keine Schwierigkeiten bereitet.The protective cap 40 covers the parts of the nozzle holder combination that protrude outward from the housing 34, 36 of the internal combustion engine practically except for the threaded connector 20, so that additional operations for the surface treatment of these parts are unnecessary. The protective cap 40 is fitted onto the nozzle holder 10 after the assembly of the nozzle holder combination, the two wall sections 43 of the neck part 42 separated by the radial slots 44 resiliently latching behind the threaded connector 20 when the annular shoulder 50 comes to rest axially on the nozzle holder 10. To remove the injection nozzle from the housing 34, 36, the protective cap 40 must be removed, which is not a problem due to the spring elasticity of the neck part 42.

Bei der Einspritzdüse nach Figur 2 ist eine Schutzkappe 60 vorgesehen, die nur von der Überwurfmutter 12 nicht überdeckte Bereiche eines Düsenhalters 62 übergreift.In the injection nozzle according to FIG. 2, a protective cap 60 is provided, which only overlaps regions of a nozzle holder 62 that are not covered by the union nut 12.

Die Schutzkappe 60 hat einen zylindrischen Abschnitt 66, der den Sechskant 24 des Düsenhalters 62 übergreift. Der zylindrische Abschnitt 66 geht an einer Ringschulter 68 in einen nach oben konisch verjüngten Abschnitt 70 über, der den Abschnitt 64 des Düsenhalters 62 formgerecht umfaßt. Der Abschnitt 70 ist durch zwei nach oben randoffene Aussparungen 72 in zwei federnde Wandabschnitte 74 aufgeteilt, die rastend hinter die untere Ringschulter des Gewindestutzens 20 greifen. Die Aussparungen 72 sind so breit ausgeführt, daß sie den freien Zugang zu den Leckölröhrchen 28 ermöglichen. Die Ringschulter 68 begrenzt zusammen mit einer axialen Schulter des Düsenhalters 62 am Übergang zwischen dem Abschnitt 64 und dem Sechskant 24 die axiale Aufstecktiefe der Schutzkappe 60.The protective cap 60 has a cylindrical section 66 which engages over the hexagon 24 of the nozzle holder 62. The cylindrical section 66 merges at an annular shoulder 68 into an upwardly conically tapered section 70, which surrounds the section 64 of the nozzle holder 62 in the correct shape. The section 70 is divided into two resilient wall sections 74 by two upwardly open cutouts 72, which engage behind the lower annular shoulder of the threaded connector 20. The recesses 72 are so wide that they allow free access to the drain oil tubes 28. The annular shoulder 68, together with an axial shoulder of the nozzle holder 62, delimits the axial insertion depth of the protective cap 60 at the transition between the section 64 and the hexagon 24.

Die Schutzkappe 60 ist ferner mit Beschriftungen 76, 78 zur Kennzeichnung der Einspritzdüse versehen, die auf geeignete Art und Weise auf die Schutzkappe aufgebracht sind. Durch diese Maßnahme, die auch bei der Ausführung nach Figur 1 vorgesehen werden kann, entfällen farbliche Kennzeichnungen oder durch Einrollen hergestellte Beschriftungen am Düsenkörper 62 bzw. 10. Bei der Montage der zusammengebauten Einspritzdüse braucht die Schutzkappe 60 nicht abgenommen zu werden, weil der Sechskant 30 der Uberwurfmutter 12 frei zugänglich bleibt.The protective cap 60 is also provided with inscriptions 76, 78 for identifying the injection nozzle, which are applied to the protective cap in a suitable manner. This measure, which can also be provided in the embodiment according to FIG. 1, eliminates color markings or inscriptions on the nozzle body 62 or 10 produced by rolling in. When the assembled injector is assembled, the protective cap 60 does not need to be removed because the hexagon 30 the union nut 12 remains freely accessible.

Claims (5)

1. Fuel injection nozzle for, in particular, self-ignition-type internal-combustion engines, comprising a nozzle housing (10, 62) which, in the installed condition, protrudes from an installation hole (56) of the engine casing (34) at least over a part of its length and the protruding area of which is provided with a central threaded stub (20) for connecting a fuel line, characterized by the following features:
a) a protective cap (40, 60), which is known per se, is constructed as an inherently rigid component which is at least approximately adapted to the shape of the area of the nozzle housing (10, 62) protruding from the engine casing (34) and consists of a material having spring-elastic properties, preferably plastic;
b) the protective cap (40, 60) exhibits at its side facing away from the engine casing an opening through which the threaded stub (20) of the nozzle housing (10, 62) penetrates when the protective cap (40, 60) is pushed onto the nozzle housing (10, 62);
c) the protective cap (40, 60) also exhibits at its side facing away from the engine casing elastically deflectable wall sections (43, 74) which point towards the opening and which are separated from one another by slots and which lockingly engage behind a shoulder, pointing towards the engine casing, of the threaded stub (20).
2. Injection nozzle according to Claim 1, characterized in that its multi-part nozzle housing consists of a nozzle body accommodating a valve needle, a nozzle holder (10, 62) accommodating a closing spring (16) and of a cap nut (12) which clamps the nozzle body against the nozzle holder (10, 62), and in that the protective cap (40, 60) at least partially encloses the part of the nozzle holder (10, 62) which is not covered by the cap nut (12).
3. Injection nozzle according to Claim 2, characterized in that the protective cap (40) also encloses a part of the cap nut (12).
4. Injection nozzle according to Claim 3, characterized in that the nozzle holder (10, 62) carries at an area protruding from the engine casing (34) at least one oil leakage tube (28) for connecting an oil leakage line, and in that at least one radial incision (44, 72) of the protective cap is constructed as a recess providing the possibility of free access to the oil leakage tube (28).
5. Injection nozzle according to one of the preceding claims, characterized in that the protective cap (40, 60) is provided with information items identifying the injection nozzle.
EP86115429A 1985-12-12 1986-11-07 Fuel injection nozzle for self-igniting internal-combustion engines in particular Expired - Lifetime EP0225487B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853543901 DE3543901A1 (en) 1985-12-12 1985-12-12 FUEL INJECTION NOZZLE, IN PARTICULAR, SELF-IGNITION, COMBUSTION ENGINES
DE3543901 1985-12-12

Publications (2)

Publication Number Publication Date
EP0225487A1 EP0225487A1 (en) 1987-06-16
EP0225487B1 true EP0225487B1 (en) 1990-08-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115429A Expired - Lifetime EP0225487B1 (en) 1985-12-12 1986-11-07 Fuel injection nozzle for self-igniting internal-combustion engines in particular

Country Status (3)

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EP (1) EP0225487B1 (en)
JP (1) JPS62142858A (en)
DE (2) DE3543901A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8801817U1 (en) * 1988-02-12 1989-06-15 Robert Bosch Gmbh, 7000 Stuttgart Identification element for fuel injection valves
DE3904773A1 (en) * 1988-02-18 1989-08-31 Daimler Benz Ag Fuel injection nozzle having a protective cap
IT1228218B (en) * 1988-02-18 1991-06-05 Daimler Benz Ag FUEL INJECTOR WITH PROTECTIVE COVER.
DE102005037007A1 (en) * 2005-08-05 2007-02-08 Robert Bosch Gmbh fuel injector

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE902200C (en) * 1950-05-15 1954-01-21 Semt Central fuel valve for internal combustion engines
DE1224092B (en) * 1959-07-04 1966-09-01 Kloeckner Humboldt Deutz Ag Injection internal combustion engine
US3159350A (en) * 1961-03-06 1964-12-01 Bendix Corp Fuel injection valve device
DE2027696A1 (en) * 1970-03-30 1971-10-21 VEB Barkas-Werke Ifa-Kombinat für Kraftfahrzeugteile Renak-Werke, χ 9800 Reichenbach Fuel injection valve for internal combustion engines
US3684318A (en) * 1970-05-22 1972-08-15 Gen Motors Corp Fuel rail-injector interconnection
JPS5036259Y2 (en) * 1971-05-12 1975-10-22
DE2943745A1 (en) * 1979-10-30 1981-05-14 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES

Also Published As

Publication number Publication date
DE3673354D1 (en) 1990-09-13
EP0225487A1 (en) 1987-06-16
JPS62142858A (en) 1987-06-26
DE3543901A1 (en) 1987-06-19

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