EP0427947B1 - Fuel injector for internal combustion engines - Google Patents

Fuel injector for internal combustion engines Download PDF

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Publication number
EP0427947B1
EP0427947B1 EP90118924A EP90118924A EP0427947B1 EP 0427947 B1 EP0427947 B1 EP 0427947B1 EP 90118924 A EP90118924 A EP 90118924A EP 90118924 A EP90118924 A EP 90118924A EP 0427947 B1 EP0427947 B1 EP 0427947B1
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EP
European Patent Office
Prior art keywords
insulating part
shaped insulating
retention body
injection nozzle
contact
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
EP90118924A
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German (de)
French (fr)
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EP0427947A1 (en
Inventor
Kurt Seifert
Karl Dipl.-Ing. Hofmann
Alfred Dipl.-Ing. Knauer
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
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0427947A1 publication Critical patent/EP0427947A1/en
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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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • the further lines are designed as individual cables, onto which an insulating tube (bougie tube) is attached and whose end sections between the two insulating molded parts provided in the lateral recess of the holding body after soldering and Fastening of the outer molded insulating part is fixed by a mushroom-shaped plastic part, the thickened shaft of which must be pressed through a hole in the outer molded insulating part.
  • the inner molded molded part is designed as an aperture covering the transverse hole, which is only interrupted by slots for the passage of the contact lugs. This design requires a relatively complex handling when soldering and assembling the parts.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the soldered connections can be made easily and safely and can be insulated from the metallic walls of the holding body, and that without additional parts and operations, the strain relief of the soldered connections when fastening the outer molded insulating part on Holding body results, which also facilitates the final assembly of the parts.
  • FIG. 1 shows an enlarged longitudinal section through an injection nozzle for diesel engines
  • FIG. 2 a side view of the upper end region of the injection nozzle according to FIG. 1,
  • FIG. 3 on a further enlarged scale and also in section the solder connections and the parts of the injection nozzle according to FIG. 1 surrounding them their final assembly
  • FIG. 4 an individual part of the injection nozzle in the direction of part A in FIG. 1
  • FIG. 5 a side view of the individual part according to FIG. 4
  • FIG. 6 a further individual part in the direction of part B in FIG. 1
  • FIG. 7 a plan view of FIG the individual part of Figure 6.
  • the injection nozzle has a holding body 10, to which a nozzle body 14, which slidably supports a valve needle 12, is fastened together with an intermediate disk 16 by means of a union nut 18.
  • the Holding body 10 has a chamber 20 for receiving a closing spring 22 and contains an induction coil 24 of a needle movement sensor, which is influenced by a bolt 26 moved with the valve needle 12.
  • the basic structure and function of the injection nozzle including the needle motion sensor correspond to a commercially available design and are therefore not explained in more detail in the present context.
  • the induction coil 24 has two radially projecting contact lugs 30 which (FIG. 3) enter a lateral recess 34 in the jacket of the holding body 10. There, the contact lugs 30 are connected to further leads via solder connections 36, which are formed by individual wires 38 of a sheathed cable 40 which is oval in cross section.
  • the solder connections 36 are produced with the aid of so-called soldering sleeves 42, which consist of a plastic tube with a soldering ring embedded therein.
  • the two contact ends to be connected are inserted one above the other in the soldering sleeves 42, after which the soldering sleeves 42 are heated by a hot air blower until the embedded solder rings run and the plastic tubes shrink onto the contact ends.
  • an inner insulating molding 48 and an outer insulating molding 50 are provided, which are simultaneously provided with means for strain relief of the solder connections 36.
  • the inner molded insulating part 48 has two side walls 52 which are arranged in parallel spacing and which abut the mouth edge 54 of the transverse hole 32 and between them delimit a space 56 for accommodating the contact lugs 30 and soldering sleeves 42.
  • the side cheeks 52 are connected to one another via a back web 58, onto which an attachment 60 is formed, projecting upwards. This also has two side cheeks 62 and a rear wall 64, which form a channel encompassing the jacket cable 40 approximately on one side.
  • a strip-like projection 68 On the side surface facing inwards 66 of the rear wall 64 is formed a strip-like projection 68, which serves to relieve the strain on the solder connections 36.
  • a shoulder 70 is formed which, in cooperation with a counter shoulder 72 on the holding body 10, holds the insulating molded part 48 in the axial direction without play on the holding body 10.
  • the outer molded insulating part 50 has an approximately segment-shaped cross-sectional profile and fills the lateral recess 34 approximately up to the outline profile of the section 74 of the holding body 10 adjoining the recess 34.
  • the insulating molding 50 has a rear wall 76, on which two strip-shaped projections 78 are formed, which, in cooperation with the projection 68 on the inner insulating molding 48, serve to relieve the strain on the solder connections 36.
  • Two laterally projecting lugs 80 are also formed on the rear wall 76, each of which is provided with an inwardly directed guide strip 82 which fits around the side cheeks 52 of the inner insulating molded part 48 and fixes this in the correct position relative to the transverse hole 32.
  • the molded insulating part 50 is provided with longitudinal grooves 84, which are semicircular in cross-section, for receiving pins 86 on one side and fit into bores 88 in section 74 of the holding body 10.
  • the lugs 80 of the molded insulating part 50 have a support surface 90 on the underside, with which the molded insulating part 50 rests on the wall surface 92 of the holding body 10 delimiting the recess 34.
  • a horizontally protruding tongue 94 is also formed on the rear wall 76, which rests between the side cheeks 52 of the insulating molded part 48 and engages on the wall surface 92 of the holding body 10 and prevents metallic contact of the contact tabs 30 or solder connections 36 with the holding body 10.
  • the molded insulating part 50 is provided with two guide legs 96, which the Reach over side cheeks 62 of the molded insulating part 48 in a suitable manner and together with them form a closed channel for the sheathed cable 40.
  • the rear wall 76 has a recess 98 on the outside, which locally weakens the rear wall 76 to a very thin wall section 99.
  • the cavity surrounding the solder connections 36 between the insulating molded parts 48, 50 is filled with a silicone compound 100.
  • the solder connections 36 are first made in the manner already described and then the inner molded insulating part 48 is inserted into the recess 34. Then, as indicated in FIG. 3, the outer molded insulating part 50 is inserted into the recess 34 from the side and pressed in the joining direction with a defined force.
  • the inner insulating material part 48 is fixed in the correct position and the sheathed cable 40 is deformed between the projections 68, 78 of the parts to relieve the strain.
  • the pins 86 are pressed or pressed into the bores 88 of the holding body 10 while maintaining the force exerted in the joining direction.
  • the bores 88 are arranged in relation to the longitudinal axis of the holding body 10 in such a way that a residual force in the joining direction is maintained after the external joining force has been canceled.
  • the silicone compound 100 is then introduced into the cavity surrounding the soldered connections 36 using an injection needle which is pierced through the thin wall section 99.

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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. Bei einer aus der EP-A-0 099 991 bekannten Einspritzdüse dieser Gattung sind die weiterführenden Leitungen als Einzelkabel ausgebildet, auf die ein Isolierrohr (Bougierrohr) aufgesteckt ist und deren Endabschnitte zwischen den beiden in der seitlichen Aussparung des Haltekörpers vorgesehenen Isolierformteilen nach dem Löten und Befestigen des äußeren Isolierformteils durch ein pilzförmiges Kunststoffteil zugentlastet festgelegt, dessen mit einer Verdickung versehener Schaft durch eine Bohrung im äußeren Isolierformteil hindurchgedrückt werden muß. Damit die Kontaktfahnen der Induktionsspule auch sicher gegen eine Berührung mit den metallischen Wänden des Querlochs im Düsenhalter geschützt sind, ist das innere Isolierformteil als eine das Querloch überdeckende Blende ausgeführt, die nur durch Schlitze für den Durchtritt der Kontaktfahnen unterbrochen ist. Diese Ausführung bedingt eine verhältnismäßig aufwendige Handhabung beim Löten und Montieren der Teile.The invention relates to a fuel injection nozzle according to the preamble of the main claim. In an injection nozzle of this type known from EP-A-0 099 991, the further lines are designed as individual cables, onto which an insulating tube (bougie tube) is attached and whose end sections between the two insulating molded parts provided in the lateral recess of the holding body after soldering and Fastening of the outer molded insulating part is fixed by a mushroom-shaped plastic part, the thickened shaft of which must be pressed through a hole in the outer molded insulating part. So that the contact lugs of the induction coil are also securely protected against contact with the metallic walls of the transverse hole in the nozzle holder, the inner molded molded part is designed as an aperture covering the transverse hole, which is only interrupted by slots for the passage of the contact lugs. This design requires a relatively complex handling when soldering and assembling the parts.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß sich die Lötverbindungen einfach und sicher herstellen und gegenüber den metallischen Wänden des Haltekörpers isolieren lassen, und daß sich ohne zusätzliche Teile und Arbeitsgänge eine einwandfreie Zugentlastung der Lötanschlüsse beim Befestigen des äußeren Isolierformteils am Haltekörper ergibt, wodurch auch die Endmontage der Teile erleichtert wird.The arrangement according to the invention with the characterizing features of the main claim has the advantage that the soldered connections can be made easily and safely and can be insulated from the metallic walls of the holding body, and that without additional parts and operations, the strain relief of the soldered connections when fastening the outer molded insulating part on Holding body results, which also facilitates the final assembly of the parts.

Durch die in den Unteransprüchen enthaltenen Maßnahmen sind vorteilhafte Weiterbildungen der Anordnung nach dem Hauptanspruch möglich.The measures contained in the subclaims allow advantageous developments of the arrangement according to the main claim.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 vergrößert einen Längsschnitt durch eine Einspritzdüse für Dieselmotoren, für Figur 2 eine Seitenansicht des oberen Endbereiches der Einspritzdüse nach Figur 1, Figur 3 in weiterem vergrößertem Maßstab und ebenfalls im Schnitt die Lötanschlüsse und die diese umgebenden Teile der Einspritzdüse nach Figur 1 vor deren endgültigem Zusammenbau, Figur 4 ein Einzelteil der Einspritzdüse in Richtung des Teiles A in Figur 1 gesehen, Figur 5 eine Seitenansicht des Einzelteils nach Figur 4, Figur 6 ein weiteres Einzelteil in Richtung des Teiles B in Figur 1 gesehen und Figur 7 eine Draufsicht auf das Einzelteil nach Figur 6.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows an enlarged longitudinal section through an injection nozzle for diesel engines, for FIG. 2 a side view of the upper end region of the injection nozzle according to FIG. 1, FIG. 3 on a further enlarged scale and also in section the solder connections and the parts of the injection nozzle according to FIG. 1 surrounding them their final assembly, FIG. 4 an individual part of the injection nozzle in the direction of part A in FIG. 1, FIG. 5 a side view of the individual part according to FIG. 4, FIG. 6 a further individual part in the direction of part B in FIG. 1, and FIG. 7 a plan view of FIG the individual part of Figure 6.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Einspritzdüse hat einen Haltekörper 10, an welchem ein eine Ventilnadel 12 verschiebbar lagernder Düsenkörper 14 zusammen mit einer Zwischenscheibe 16 durch eine Überwurfmutter 18 befestigt ist. Der Haltekörper 10 hat eine Kammer 20 zur Aufnahme einer Schließfeder 22 und enthält eine Induktionsspule 24 eines Nadelbewegungsfühlers, die von einem mit der Ventilnadel 12 bewegten Bolzen 26 beeinflusst ist. Der grundsätzliche Aufbau und die Funktion der Einspritzdüse samt Nadelbewegungsfühler entsprechen einer handelsüblichen Ausführung und werden daher im vorliegenden Zusammenhang nicht näher erläutert.The injection nozzle has a holding body 10, to which a nozzle body 14, which slidably supports a valve needle 12, is fastened together with an intermediate disk 16 by means of a union nut 18. The Holding body 10 has a chamber 20 for receiving a closing spring 22 and contains an induction coil 24 of a needle movement sensor, which is influenced by a bolt 26 moved with the valve needle 12. The basic structure and function of the injection nozzle including the needle motion sensor correspond to a commercially available design and are therefore not explained in more detail in the present context.

Die Induktionsspule 24 hat zwei radial abstehende Kontaktfahnen 30, die (Figur 3) in eine seitliche Ausnehmung 34 im Mantel des Haltekörpers 10 treten. Dort sind die Kontaktfahnen 30 über Lötanschlüsse 36 mit weiterführenden Leitungen verbunden, die durch Einzeldrähte 38 eines im Querschnitt ovalen Mantelkabels 40 gebildet sind. Die Lötanschlüsse 36 sind mit Hilfe von sogenannten Löthülsen 42 hergestellt, die aus einem Kunststoffschlauch mit darin eingelagertem Lötering bestehen. In die Löthülsen 42 werden die beiden zu verbindenden Kontaktenden übereinanderliegend eingeschoben, wonach die Löthülsen 42 durch ein Heißluftgebläse erwärmt werden, bis die eingelagerten Lotringe verlaufen und die Kunststoffschläuche auf die Kontaktenden aufschrumpfen.The induction coil 24 has two radially projecting contact lugs 30 which (FIG. 3) enter a lateral recess 34 in the jacket of the holding body 10. There, the contact lugs 30 are connected to further leads via solder connections 36, which are formed by individual wires 38 of a sheathed cable 40 which is oval in cross section. The solder connections 36 are produced with the aid of so-called soldering sleeves 42, which consist of a plastic tube with a soldering ring embedded therein. The two contact ends to be connected are inserted one above the other in the soldering sleeves 42, after which the soldering sleeves 42 are heated by a hot air blower until the embedded solder rings run and the plastic tubes shrink onto the contact ends.

Zum isolierten, schüttelsicheren Festhalten der Lötanschlüsse 36 in der seitlichen Ausnehmung 34 des Haltekörpers 10 und zur schützenden Abdeckung nach außen sind ein inneres Isolierformteil 48 und ein äußeres Isolierformteil 50 vorgesehen, die gleichzeitig mit Mitteln zur Zugentlastung der Lötanschlüsse 36 versehen sind. Das innere Isolierformteil 48 hat zwei im Parallelabstand angeordnete Seitenwangen 52, die am Mündungsrand 54 des Querlochs 32 anliegen und zwischen sich einen Raum 56 zur passenden Aufnahme der Kontaktfahnen 30 und Löthülsen 42 begrenzen. Die Seitenwangen 52 sind über einen Rückensteg 58 miteinander verbunden, an den nach oben abstehend ein Aufsatz 60 angeformt ist. Dieser hat ebenfalls zwei Seitenwangen 62 und eine Rückwand 64, die einen das Mantelkahel 40 etwa halbseitig umfassenden Kanal bilden. An der nach innen gekehrten Seitenfläche 66 der Rückwand 64 ist ein leistenartiger Vorsprung 68 angeformt, welcher zur Zugentlastung der Lötanschlüsse 36 dient. Am Übergang des Rückensteges 58 zum Aufsatz 60 ist eine Schulter 70 gebildet, die im Zusammenwirken mit einer Gegenschulter 72 am Haltekörper 10 das Isolierformteil 48 in Achsrichtung spiellos am Haltekörper 10 festhält.For insulated, shake-proof holding of the solder connections 36 in the lateral recess 34 of the holding body 10 and for protective covering to the outside, an inner insulating molding 48 and an outer insulating molding 50 are provided, which are simultaneously provided with means for strain relief of the solder connections 36. The inner molded insulating part 48 has two side walls 52 which are arranged in parallel spacing and which abut the mouth edge 54 of the transverse hole 32 and between them delimit a space 56 for accommodating the contact lugs 30 and soldering sleeves 42. The side cheeks 52 are connected to one another via a back web 58, onto which an attachment 60 is formed, projecting upwards. This also has two side cheeks 62 and a rear wall 64, which form a channel encompassing the jacket cable 40 approximately on one side. On the side surface facing inwards 66 of the rear wall 64 is formed a strip-like projection 68, which serves to relieve the strain on the solder connections 36. At the transition from the back web 58 to the attachment 60, a shoulder 70 is formed which, in cooperation with a counter shoulder 72 on the holding body 10, holds the insulating molded part 48 in the axial direction without play on the holding body 10.

Das äußere Isolierformteil 50 hat ein etwa segmentförmiges Querschnittsprofil und füllt die seitliche Ausnehmung 34 etwa bis zum Umrissprofil des an die Ausnehmung 34 anschliessenden Abschnitts 74 des Haltekörpers 10 auf. Das Isolierformteil 50 hat eine Rückwand 76, an die zwei leistenförmige Vorsprünge 78 angeformt sind, welche im Zusammenwirken mit dem Vorsprung 68 am inneren Isolierformteil 48 zur Zugentlastung der Lötanschlüsse 36 dienen. An die Rückwand 76 sind ferner zwei seitlich ausladende Ansätze 80 angeformt, die je mit einer nach innen gekehrten Führungsleiste 82 versehen sind, welche die Seitenwangen 52 des inneren Isolierformteils 48 passend umgreifen und dieses in der richtigen Lage gegenüber dem Querloch 32 festlegen. An den Übergängen der Rückwand 76 zu den seitlichen Ansätzen 80 ist das Isolierformteil 50 mit im Querschnitt halbkreisförmigen Längsnuten 84 zur halbseitigen Aufnahme von Stiften 86 versehen, die passend in Bohrungen 88 im Abschnitt 74 des Haltekörpers 10 stecken.The outer molded insulating part 50 has an approximately segment-shaped cross-sectional profile and fills the lateral recess 34 approximately up to the outline profile of the section 74 of the holding body 10 adjoining the recess 34. The insulating molding 50 has a rear wall 76, on which two strip-shaped projections 78 are formed, which, in cooperation with the projection 68 on the inner insulating molding 48, serve to relieve the strain on the solder connections 36. Two laterally projecting lugs 80 are also formed on the rear wall 76, each of which is provided with an inwardly directed guide strip 82 which fits around the side cheeks 52 of the inner insulating molded part 48 and fixes this in the correct position relative to the transverse hole 32. At the transitions from the rear wall 76 to the side lugs 80, the molded insulating part 50 is provided with longitudinal grooves 84, which are semicircular in cross-section, for receiving pins 86 on one side and fit into bores 88 in section 74 of the holding body 10.

Die Ansätze 80 des Isolierformteils 50 haben an der Unterseite eine Auflagefläche 90, mit denen das Isolierformteil 50 auf der die Ausnehmung 34 begrenzenden Wandfläche 92 des Haltekörpers 10 aufliegt. An der Rückwand 76 ist ferner eine waagrecht abstehende Zunge 94 angeformt, die zwischen die Seitenwangen 52 des Isolierformteils 48 greifend auf der Wandfläche 92 des Haltekörpers 10 aufliegt und eine metallische Berührung der Kontaktfahnen 30 bzw. Lötanschlüsse 36 mit dem Haltekörper 10 verhindert. In seinem oberen Bereich ist das Isolierformteil 50 mit zwei Führungsschenkeln 96 versehen, welche die Seitenwangen 62 des Isolierformteils 48 passend übergreifen und zusammen mit diesen einen geschlossenen Kanal für das Mantelkabel 40 bilden. Ferner hat die Rückwand 76 außen eine Aussparung 98, welche die Rückwand 76 örtlich bis auf einen sehr dünnen Wandabschnitt 99 schwächt. Der die Lötanschlüsse 36 umgebende Hohlraum zwischen den Isolierformteilen 48, 50 ist mit einer Silikonmasse 100 ausgefüllt.The lugs 80 of the molded insulating part 50 have a support surface 90 on the underside, with which the molded insulating part 50 rests on the wall surface 92 of the holding body 10 delimiting the recess 34. A horizontally protruding tongue 94 is also formed on the rear wall 76, which rests between the side cheeks 52 of the insulating molded part 48 and engages on the wall surface 92 of the holding body 10 and prevents metallic contact of the contact tabs 30 or solder connections 36 with the holding body 10. In its upper region, the molded insulating part 50 is provided with two guide legs 96, which the Reach over side cheeks 62 of the molded insulating part 48 in a suitable manner and together with them form a closed channel for the sheathed cable 40. Furthermore, the rear wall 76 has a recess 98 on the outside, which locally weakens the rear wall 76 to a very thin wall section 99. The cavity surrounding the solder connections 36 between the insulating molded parts 48, 50 is filled with a silicone compound 100.

Bei der Fertigmontage des Haltekörpers 10 werden zunächst die Lötanschlüsse 36 in der bereits beschriebenen Weise hergestellt und danach das innere Isolierformteil 48 in die Ausnehmung 34 eingesetzt. Dann wird, wie in Figur 3 angedeutet, das äußere Isolierformteil 50 von der Seite her in die Ausnehmung 34 eingefügt und mit einer definierten Kraft in Fügerichtung gepresst. Dabei werden das innere Isolierstoffteil 48 in der richtigen Lage fixiert und das Mantelkabel 40 zwischen den Vorsprüngen 68, 78 der Teile zugentlastend verformt. Wenn das Isolierformteil 50 am Haltekörper 10 zur Anlage gekommen ist, werden die Stifte 86 unter Beibehaltung der in Fügerichtung ausgeübten Kraft in die Bohrungen 88 des Haltekörpers 10 eingedrückt bzw. - gepresst. Die Bohrungen 88 sind so zur Längsachse des Haltekörpers 10 angeordnet, daß nach Aufhebung der äußeren Fügekraft eine Restkraft in Fügerichtung aufrecht erhalten bleibt. Danach wird mit einer Injektionsnadel, welche durch den dünnen Wandabschnitt 99 hindurchgestochen wird, die Silikonmasse 100 in den die Lötanschlüsse 36 umgebenden Hohlraum eingebracht.During the final assembly of the holding body 10, the solder connections 36 are first made in the manner already described and then the inner molded insulating part 48 is inserted into the recess 34. Then, as indicated in FIG. 3, the outer molded insulating part 50 is inserted into the recess 34 from the side and pressed in the joining direction with a defined force. The inner insulating material part 48 is fixed in the correct position and the sheathed cable 40 is deformed between the projections 68, 78 of the parts to relieve the strain. When the molded insulating part 50 comes to rest on the holding body 10, the pins 86 are pressed or pressed into the bores 88 of the holding body 10 while maintaining the force exerted in the joining direction. The bores 88 are arranged in relation to the longitudinal axis of the holding body 10 in such a way that a residual force in the joining direction is maintained after the external joining force has been canceled. The silicone compound 100 is then introduced into the cavity surrounding the soldered connections 36 using an injection needle which is pierced through the thin wall section 99.

Claims (6)

  1. Fuel injection nozzle for internal combustion engines, having a retention body (10) on which is fastened a nozzle body (14) displaceably supporting a valve needle (12) and which contains a chamber (20) for accommodating at least one closing spring (22) and an induction coil (24) of a needle motion sensor which is influenced by a part (26) moved with the valve needle (12) and having two radially protruding contact tabs (30) which protrude into a side opening (34) in the outer shell of the retention body (10) and are there soldered to continuing conductors (38) and also having an shaped insulating part (48) arranged in the side opening (34) of the retention body (10), which shaped insulating part (48) is held in its installation position by an outer shaped insulating part (50) covering the soldered connections (36) towards the outside, which outer shaped insulating part (50) is provided with means (68, 78) for removing tension from the soldered connections (36) and is fastened by pins (86) on the retention body (10), which pins are arranged parallel to the longitudinal axis of the retention body (10) and engage in correspondingly arranged holes (88) in one of the two outer shell regions of the retention body (10) which axially limit the side opening (34) used to accommodate the soldered connections (36), characterised by the following features:
    a) the continuing conductors (38) are formed by the individual wires of a sheathed cable (40),
    b) the individual wires (38) of the sheathed cable (40) are each connected by means of a soldering sleeve (42) to a contact tab (30) of the induction coil (24), which soldering sleeves (42) consist of a plastic sleeve passing over both contact ends and shrinking over the contact ends on heating and of an enclosed solder ring,
    c) the inner shaped insulating part (48) in contact with the bottom of the side opening (34) and the outer shaped insulating part (50) covering the soldered connections (36) are provided with protrusions (68, 78), preferably offset to one another, on the mutually facing wall region (66, 76) upstream of the soldered connections (36),
    d) the holes (88) in the retention body (10) provided to accommodate the pins (86) are at such a distance from the longitudinal axis of the retention body (10) that the pins (86) hold the outer shaped insulating part (50) in an installation position, that the sheathed cable (40) clamped between the protrusions (68, 78) of the shaped insulating parts (48, 50) are deformed so that tension is removed.
  2. Injection nozzle according to Claim 1, characterised in that the inner shaped insulating part (48) is provided with side cheeks (52) protruding from the edge of the opening (54) of the transverse hole (32) and bounding between them a space (56) for the contact tabs (30) and soldering sleeves (42), guide strips (82) of the outer shaped insulating part (50) passing around and being matched to these side cheeks (52).
  3. Injection nozzle according to Claim 2, characterised in that the two side cheeks (52) of the inner shaped insulating part (48) are connected together by means of a rear web (58) on which a top (60) is formed protruding upwards, on whose side surface (66) facing towards the outer shaped insulating part (50) is formed a protrusion (68) to remove tension from the soldered connections (36).
  4. Injection nozzle according to Claim 3, characterised in that the inner shaped insulating part (48) has a shoulder (70) at the transition of its rear web (58) to the top (60) protruding upwards, which shoulder (70) is in contact on a mating shoulder (72) of the retention body (10) fixing the inner shaped insulating part (48) in the opening (34) in the axial direction without clearance.
  5. Injection nozzle according to Claim 3 or 4, characterised in that the top (60) on the inner shaped insulating part (48) is provided with side cheeks (62), laterally guiding the sheathed cable (40), inwardly-directed guide arms (96) of the outer shaped insulating part (50) passing over the guide cheeks (62) and being matched to them.
  6. Injection nozzle according to one of the Claims 2 to 5, characterised in that the outer shaped insulating part (50) is provided with a projection (94) engaging like a tongue between the side cheeks (52) of the inner shaped insulating part (48), which projection insulates the contact tabs (30) and the soldered connections (36) from the one wall surface (92) of the retention body (10) bounding the side opening (34) axially.
EP90118924A 1989-11-14 1990-10-04 Fuel injector for internal combustion engines Expired - Lifetime EP0427947B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3937750 1989-11-14
DE3937750A DE3937750A1 (en) 1989-11-14 1989-11-14 FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0427947A1 EP0427947A1 (en) 1991-05-22
EP0427947B1 true EP0427947B1 (en) 1993-03-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118924A Expired - Lifetime EP0427947B1 (en) 1989-11-14 1990-10-04 Fuel injector for internal combustion engines

Country Status (3)

Country Link
EP (1) EP0427947B1 (en)
JP (1) JP2921596B2 (en)
DE (2) DE3937750A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108416C2 (en) * 1991-03-15 2000-05-18 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines
JP2979467B2 (en) * 1996-05-10 1999-11-15 株式会社ケーヒン Electromagnetic fuel injection valve
DE102006051205A1 (en) * 2006-10-30 2008-05-08 Robert Bosch Gmbh Fuel injector for internal combustion engine, has measuring device, which is formed as inductive sensor and measuring body, partly surrounds displacement device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3125884A1 (en) * 1981-07-01 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3244245A1 (en) * 1982-11-30 1984-05-30 Robert Bosch Gmbh, 7000 Stuttgart Fuel injection nozzle for internal combustion engines

Also Published As

Publication number Publication date
JP2921596B2 (en) 1999-07-19
DE59000972D1 (en) 1993-04-08
EP0427947A1 (en) 1991-05-22
JPH03168357A (en) 1991-07-22
DE3937750A1 (en) 1991-05-16

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