EP1476653A1 - Injector with improved connecting geometry - Google Patents

Injector with improved connecting geometry

Info

Publication number
EP1476653A1
EP1476653A1 EP03708038A EP03708038A EP1476653A1 EP 1476653 A1 EP1476653 A1 EP 1476653A1 EP 03708038 A EP03708038 A EP 03708038A EP 03708038 A EP03708038 A EP 03708038A EP 1476653 A1 EP1476653 A1 EP 1476653A1
Authority
EP
European Patent Office
Prior art keywords
injector
connection
leakage
electrical connection
injection
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.)
Granted
Application number
EP03708038A
Other languages
German (de)
French (fr)
Other versions
EP1476653B1 (en
Inventor
Jürgen Dick
Willibald SCHÜRZ
Martin Simmet
Marcus Unruh
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1476653A1 publication Critical patent/EP1476653A1/en
Application granted granted Critical
Publication of EP1476653B1 publication Critical patent/EP1476653B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure

Definitions

  • the present invention relates to an injector, in particular for a storage injection device, according to the preamble of claim 1 with an improved connection geometry.
  • Injectors for storage injection devices are known in different configurations. Injectors of this type have a high-pressure connection for supplying fuel under high pressure, an electrical connection and a leakage connection for removing leakage from the injector.
  • the connection points are located at different positions on the injector, in particular on the injector head and on the injector main body.
  • a leakage connection for a fuel injector in which a connection piece is formed in one piece with an injector body.
  • a stepped bore is provided on the connecting piece in order to be connected to a connecting nipple which engages with an insert in the stepped bore.
  • a connection between the connecting nipple and the connecting piece is made by means of an elastic clamp.
  • a separate electrical connection and a separate high-pressure inlet connection for the fuel are provided.
  • a common rail injector is known from WO 01/18382 AI, in which an electrical connection and a leakage return connection are arranged at a head-side end of the injector.
  • a connection piece is formed for the leakage connection on the injector, which is surrounded by a cover-like socket body.
  • This cover-like socket body also provides protection for the electrical see terminals ready.
  • the leakage connection is furthermore formed by a plug housing, which can be detachably inserted by means of latching devices over the connecting piece and the socket body of the electrical connection terminals.
  • a leakage connection of the injector is integrated in an overmolding for the electrical connection.
  • a one-piece component is thus provided, which is injection molded onto the injector and comprises the leakage connection and the electrical connection.
  • the one-piece component is molded directly onto the injector, so that a minimum number of components is obtained.
  • the injector is overmolded in one operation, in which the electrical connection and the leakage connection are established at the same time. Since the one-piece component is molded directly onto the injector, it can no longer be removed from the injector without being destroyed.
  • the leakage connection according to the invention and the electrical connection can thus be produced particularly inexpensively.
  • the leakage connection is formed in one piece with the electrical connection, there is preferably only one leakage hole in the injector for supplying leakage provided which is designed as a simple cylindrical bore.
  • the complex step bore production used in the prior art, with subsequent post-processing steps such as deburring and hardening can be dispensed with due to the increasingly thin wall diameter.
  • no additional connection pieces are necessary for the leakage hole.
  • a leakage nipple attachment is preferably integrated in the one-piece extrusion coating.
  • the one-piece molded component is particularly preferably made of plastic.
  • the leakage connection in the one-piece molded component is preferably arranged offset by 180 ° to the electrical connection.
  • the axes of the electrical connection and the leakage connection lie in one plane through a central axis of the injector, which results in a relatively simple construction of an injection mold.
  • the one-piece molded component with the two connections is preferably arranged on the head of the injector.
  • the head of the injector is understood to mean the end of the injector that is furthest from the end in which fuel is injected into a combustion chamber of an internal combustion engine.
  • the inlet connection (high-pressure connection) of the injector is arranged at the front end of the head of the injector.
  • the one-piece molded component is then preferably injected around the inlet connection.
  • the one-piece injection-molded component thus has a type of cover function, only one passage for the inlet connection being provided at the front end region.
  • a circumferential recess, in particular a groove which is U-shaped in section, is preferably formed on the outer circumference of the extrusion-coated leakage connection.
  • a locking device which provides locking with a return line, can engage in this groove.
  • the leakage connection and the electrical connection are arranged at an angle of approximately 45 ° to a central axis of the injector. This enables a particularly compact connection to be obtained.
  • the one-piece injection-molded component preferably encloses the entire head-side end of the injector, so that the injector head is completely covered.
  • a leakage connection for fastening a leakage line to an injector is provided according to the invention, the leakage connection and an electrical connection of the injector being formed on a one-piece component.
  • the one-piece component is molded directly onto the injector.
  • the leakage connection is integrated into the encapsulation of the electrical connection, so that it is simple and inexpensive to manufacture with a minimal number of components.
  • the connecting lines for the leakage connection necessary in the injector can be constructed in a particularly simple manner and can also be provided very inexpensively.
  • the present invention is used in particular in fuel storage injection systems, such as common rail systems.
  • fuel storage injection systems such as common rail systems.
  • inventive integration of the leakage connection and the electrical connection in a molded component a particularly compact structure can be provided, which in particular provides space advantages in confined engine compartments.
  • the invention is described below on the basis of a preferred exemplary embodiment in conjunction with the drawing. In the drawing is:
  • FIG. 1 shows a schematic, perspective view of an injector according to an exemplary embodiment of the present invention
  • Figure 2 is a side view of the injector shown in Figure 1
  • Figure 3 is a partially sectioned side view of the injector shown in Figure 2.
  • FIG. 1 An injector 1 according to an exemplary embodiment is described below with reference to FIGS. 1 to 3.
  • a one-piece component 2 is attached to the head 10 of the injector 1 by means of injection molding.
  • the one-piece component 2 comprises a leakage connection 3 and an electrical connection 7.
  • the injection-molded component 2 is injection-molded over the head 10 of the injector 1.
  • the injection component 2 is sprayed around a fuel supply connection 8 arranged at the front end of the head 10, so that an annular main region 6 of the injection component 2 is formed, from which the leakage connection 3 and the electrical connection 7 depart.
  • the leakage connection 3 and the electrical connection 7 are arranged at an angle ⁇ of approximately 45 ° to a central axis XX of the injector. Furthermore, the leakage connection 3 to the electrical connection 7 is arranged such that its two central axes lie in one plane. In other words, the leakage connection 3 is arranged offset by 180 ° to the electrical connection 7 (cf. FIG. 1). Since in the exemplary embodiment shown the inlet connection 8, the electrical connection 7 and the leakage connection 3 are all arranged on the head 10 of the injector, a particularly compact and slim injector 1 is obtained. Due to the arrangement of all connections at its upper end, the injector 1 can in particular be installed in different engines from different manufacturers with different installation space. Thus, the injector according to the invention can be used universally, and it is not necessary to have a special injector available for every engine manufacturer.
  • the one-piece molded part 2 Since the one-piece molded part 2 is molded directly onto the injector, it can only be removed from the injector by being destroyed. However, this direct injection also prevents accidental loosening, e.g. due to vibrations or the like.
  • a leakage line 9 arranged in the injector 1 is designed as a simple cylindrical bore with a chamfer at its end. Since, according to the invention, the leakage connection is completely formed on the molded component, the stepped bore in the injector head, which is complex to manufacture and rework, can be dispensed with. Since the one-piece component 2 is an injection molded component, the inner recess 5 of the leakage connection 3 in particular can be easily, e.g. also step-like.
  • a circumferential groove 4 is formed, which serves to receive a locking element with which a return line can be fixed.
  • the leakage connection 3 and the electrical connection 7 on the ring-shaped main area 6 essentially face each other. Are arranged above, this also results in a particularly simple structure of the injection mold.
  • the two connections 3 and 7 can thus be produced in one work step.
  • the electrical connection 7 is designed in a known manner as a plug connection, so that the subsequent installation in the motor can also be carried out quickly and easily.
  • the present invention thus relates to an injector, in particular for an accumulator injection device, with an inlet connection 8, a leakage connection 3 and an electrical connection 7.
  • the leakage connection 3 and the electrical connection 7 are designed as a one-piece injection-molded component 2 which is injection-molded directly onto the injector 1 is.

Abstract

The invention relates to an injector, especially for an accumulator injection device, comprising an inlet connection (8), a leakage connection (3) and an electric connection (7). Said leakage connection (3) and the electric connection (7) are embodied as a single-piece injection component (2), said component being directly injection-moulded onto the injector (1).

Description

Beschreibungdescription
Injektor mit verbesserter AnschlussgeometrieInjector with improved connection geometry
Die vorliegende Erfindung betrifft einen Injektor, insbesondere für eine Speichereinspritzvorrichtung, gemäß dem Oberbegriff des Patentanspruchs 1 mit einer verbesserten Anschlussgeometrie .The present invention relates to an injector, in particular for a storage injection device, according to the preamble of claim 1 with an improved connection geometry.
Injektoren für Speichereinspritzvorrichtungen sind in unterschiedlichen Ausgestaltungen bekannt. Derartige Injektoren weisen dabei einen Hochdruckanschluss zum Zufuhren von Kraftstoff unter hohem Druck, einen elektrischen Anschluss sowie einen Leckageanschluss zum Abfuhren von Leckage aus dem In- jektor auf. Die Anschlussstellen liegen dabei an unterschiedlichen Positionen am Injektor, insbesondere am Injektorkopf und am Injektorhauptkorper .Injectors for storage injection devices are known in different configurations. Injectors of this type have a high-pressure connection for supplying fuel under high pressure, an electrical connection and a leakage connection for removing leakage from the injector. The connection points are located at different positions on the injector, in particular on the injector head and on the injector main body.
Aus der DE 199 40 387 Cl ist beispielsweise ein Leckagean- schluss für einen Kraftstoffinjektor bekannt, bei dem ein Anschlussstutzen einstuckig mit einem Injektorkorper ausgebildet ist. Am Anschlussstutzen ist dabei eine Stufenbohrung vorgesehen, um mit einem Anschlussnippel, welcher mit einem Einsatz in die Stufenbohrung eingreift, verbunden zu werden. Hierbei wird mittels einer elastischen Klammer eine Verbindung zwischen dem Anschlussnippel und dem Anschlussstutzen hergestellt. Weiterhin ist ein separater elektrischer Anschluss und ein separater Hochdruckzulaufanschluss für den Kraftstoff vorgesehen.From DE 199 40 387 C1, for example, a leakage connection for a fuel injector is known, in which a connection piece is formed in one piece with an injector body. A stepped bore is provided on the connecting piece in order to be connected to a connecting nipple which engages with an insert in the stepped bore. Here, a connection between the connecting nipple and the connecting piece is made by means of an elastic clamp. Furthermore, a separate electrical connection and a separate high-pressure inlet connection for the fuel are provided.
Weiterhin ist aus der WO 01/18382 AI ein Common-Rail-Injektor bekannt, bei dem ein elektrischer Anschluss und ein Leckage- rucklaufanschluss an einem kopfseitigen Ende des Injektors angeordnet sind. Hierbei ist für den Leckageanschluss am In- jektor ein Anschlussstutzen ausgebildet, welcher von einem deckelartigen Buchsenkorper umgeben ist. Dieser deckelartige Buchsenkorper stellt weiterhin einen Schutz für die elektri- sehen Anschlussklemmen bereit. Der Leckageanschluss wird weiterhin durch ein Steckergehause gebildet, welches losbar mittels Rasteinrichtungen über den Anschlussstutzen und den Buchsenkorper der elektrischen Anschlussklemmen gesteckt wird. Somit umfasst diese bekannte Losung eine Vielzahl von Einzelteilen, um die Anschlussgeometrie für den elektrischen Anschluss und den Leckageanschluss bereitzustellen.Furthermore, a common rail injector is known from WO 01/18382 AI, in which an electrical connection and a leakage return connection are arranged at a head-side end of the injector. Here, a connection piece is formed for the leakage connection on the injector, which is surrounded by a cover-like socket body. This cover-like socket body also provides protection for the electrical see terminals ready. The leakage connection is furthermore formed by a plug housing, which can be detachably inserted by means of latching devices over the connecting piece and the socket body of the electrical connection terminals. This known solution therefore comprises a large number of individual parts in order to provide the connection geometry for the electrical connection and the leakage connection.
Es ist von daher Aufgabe der vorliegenden Erfindung, einen Leckageanschluss bzw. einen Injektor mit einem Leckageanschluss bereitzustellen, welcher einfach aufgebaut ist und kostengünstig bereitgestellt werden kann.It is therefore an object of the present invention to provide a leakage connection or an injector with a leakage connection, which is simple in construction and can be provided inexpensively.
Diese Aufgabe wird durch einen Injektor mit den Merkmalen des Anspruchs 1 bzw. einen Leckageanschluss mit den Merkmalen des Anspruchs 11 gelost. Die Unteranspruche zeigen vorteilhafte Weiterbildungen der Erfindung.This object is achieved by an injector with the features of claim 1 or a leakage connection with the features of claim 11. The subclaims show advantageous developments of the invention.
Bei der erfindungsgemaßen Losung ist ein Leckageanschluss des Injektors in eine Umspritzung für den elektrischen Anschluss integriert. Somit wird erfindungsgemaß ein einstuckiges Bauteil bereitgestellt, welches an den Injektor angespritzt wird und den Leckageanschluss und den elektrischen Anschluss umfasst. Dabei ist das einstuckige Bauteil unmittelbar an den Injektor angespritzt, sodass eine minimale Bauteileanzahl erhalten wird. Die Umspritzung des Injektors erfolgt dabei in einem Arbeitsgang, in dem gleichzeitig der elektrische Anschluss und der Leckageanschluss hergestellt wird. Da das einstuckige Bauteil unmittelbar an den Injektor angespritzt ist, kann es nicht mehr zerstörungsfrei vom Injektor entfernt werden. Somit kann der erfindungsgemaße Leckageanschluss und der elektrische Anschluss besonders kostengünstig hergestellt werden .In the solution according to the invention, a leakage connection of the injector is integrated in an overmolding for the electrical connection. According to the invention, a one-piece component is thus provided, which is injection molded onto the injector and comprises the leakage connection and the electrical connection. The one-piece component is molded directly onto the injector, so that a minimum number of components is obtained. The injector is overmolded in one operation, in which the electrical connection and the leakage connection are established at the same time. Since the one-piece component is molded directly onto the injector, it can no longer be removed from the injector without being destroyed. The leakage connection according to the invention and the electrical connection can thus be produced particularly inexpensively.
Da erfindungsgemaß der Leckageanschluss einstuckig mit dem elektrischen Anschluss gebildet ist, ist vorzugsweise im Injektor nur noch eine Leckagebohrung zum Zufuhren von Leckage vorgesehen, welche als einfache zylindrische Bohrung ausgebildet ist. Somit kann insbesondere auf die im Stand der Technik verwendete, aufwendige Stufenbohrungsherstellung mit anschließenden Nachbearbeitungsschritten wie Entgraten und Harten auf Grund der zunehmend nach außen dunner werdenden Wanddurchmesser verzichtet werden. Darüber hinaus sind auch keine zusatzlichen Anschlussstutzen für die Leckagebohrung notwendig. Weiterhin ist vorzugsweise eine Leckagenippelbefestigung in der einstuckigen Umspritzung integriert.Since, according to the invention, the leakage connection is formed in one piece with the electrical connection, there is preferably only one leakage hole in the injector for supplying leakage provided which is designed as a simple cylindrical bore. Thus, in particular, the complex step bore production used in the prior art, with subsequent post-processing steps such as deburring and hardening, can be dispensed with due to the increasingly thin wall diameter. In addition, no additional connection pieces are necessary for the leakage hole. Furthermore, a leakage nipple attachment is preferably integrated in the one-piece extrusion coating.
Besonders bevorzugt ist das einstuckige Spritzbauteil dabei aus Kunststoff hergestellt.The one-piece molded component is particularly preferably made of plastic.
Vorzugsweise ist der Leckageanschluss im einstuckigen Spritz- bauteil um 180° versetzt zum elektrischen Anschluss angeordnet. Somit liegen die Achsen des elektrischen Anschlusses und des Leckageanschlusses in einer Ebene durch eine Mittelachse des Injektors, woraus ein relativ einfacher Aufbau eines Spritzwerkzeuges resultiert.The leakage connection in the one-piece molded component is preferably arranged offset by 180 ° to the electrical connection. Thus, the axes of the electrical connection and the leakage connection lie in one plane through a central axis of the injector, which results in a relatively simple construction of an injection mold.
Um einen besonders kompekten Aufbau bereitzustellen, ist das einstuckige Spritzbauteil mit den beiden Anschlüssen vorzugsweise am Kopf des Injektors angeordnet. Hierbei wird unter dem Kopf des Injektors dasjenige Ende des Injektors verstan- den, welches am weitesten von dem Ende entfernt ist, in welchem eine Einspritzung von Kraftstoff in einem Brennraum einer Brennkraftmaschine erfolgt.In order to provide a particularly compact structure, the one-piece molded component with the two connections is preferably arranged on the head of the injector. The head of the injector is understood to mean the end of the injector that is furthest from the end in which fuel is injected into a combustion chamber of an internal combustion engine.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegen- den Erfindung ist der Zulaufanschluss (Hochdruckanschluss) des Injektors am stirnseitigen Ende des Kopfes des Injektors angeordnet. Dabei ist dann das einstuckige Spritzbauteil vorzugsweise um den Zulaufanschluss herum gespritzt. Somit weist das einstuckige Spritzbauteil eine Art Deckelfunktion auf, wobei nur ein Durchlass für den Zulaufanschluss am stirnseitigen Endbereich vorgesehen ist. Bevorzugt ist am äußeren Umfang des umspritzten Leckageanschlusses eine umlaufende Aussparung, insbesondere eine im Schnitt U-förmige Nut, ausgebildet. In diese Nut kann eine Verriegelungseinrichtung eingreifen, welche eine Verriegelung mit einer Rücklaufleitung bereitstellt.According to a further preferred embodiment of the present invention, the inlet connection (high-pressure connection) of the injector is arranged at the front end of the head of the injector. The one-piece molded component is then preferably injected around the inlet connection. The one-piece injection-molded component thus has a type of cover function, only one passage for the inlet connection being provided at the front end region. A circumferential recess, in particular a groove which is U-shaped in section, is preferably formed on the outer circumference of the extrusion-coated leakage connection. A locking device, which provides locking with a return line, can engage in this groove.
Gemäß einer besonders bevorzugten Ausgestaltung der vorliegenden Erfindung ist der Leckageanschluss und der elektrische Anschluss in einem Winkel von ca. 45° zu einer Mittelachse des Injektors angeordnet. Dadurch kann ein besonders kompakter Anschluss erhalten werden.According to a particularly preferred embodiment of the present invention, the leakage connection and the electrical connection are arranged at an angle of approximately 45 ° to a central axis of the injector. This enables a particularly compact connection to be obtained.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung umschließt das einstückige Spritzbauteil vor- zugsweise das gesamte kopfseitige Ende des Injektors, sodass eine vollständige Abdeckung des Injektorkopfes erhalten wird.According to a further preferred embodiment of the present invention, the one-piece injection-molded component preferably encloses the entire head-side end of the injector, so that the injector head is completely covered.
Weiter wird erfindungsgemäß ein Leckageanschluss zur Befestigung einer Leckageleitung an einem Injektor bereitgestellt, wobei der Leckageanschluss und ein elektrischer Anschluss des Injektors an einem einstückigen Bauteil ausgebildet sind. Das einstückige Bauteil ist dabei unmittelbar an dem Injektor angespritzt. Somit wird erfindungsgemäß der Leckageanschluss in die Umspritzung des elektrischen Anschlusses integriert, so- dass eine einfache und kostengünstige Herstellbarkeit bei einer minimalen Bauteileanzahl gegeben ist. Hierbei können die im Injektor notwendigen Verbindungsleitungen zum Leckageanschluss besonders einfach aufgebaut sein und ebenfalls sehr kostengünstig bereitgestellt werden.Furthermore, a leakage connection for fastening a leakage line to an injector is provided according to the invention, the leakage connection and an electrical connection of the injector being formed on a one-piece component. The one-piece component is molded directly onto the injector. Thus, according to the invention, the leakage connection is integrated into the encapsulation of the electrical connection, so that it is simple and inexpensive to manufacture with a minimal number of components. Here, the connecting lines for the leakage connection necessary in the injector can be constructed in a particularly simple manner and can also be provided very inexpensively.
Die vorliegende Erfindung wird insbesondere bei Kraftstoff- speichereinspritzsystemen, wie z.B. Common-Rail-Syste en, verwendet. Durch die erfindungsgemäße Integration des Leckageanschlusses und des elektrischen Anschlusses in einem Spritzbauteil kann dabei ein besonders kompakter Aufbau bereitgestellt werden, welcher insbesondere Bauraumvorteile in beengten Motorräumen bereitstellt. Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung beschrieben. In der Zeichnung ist:The present invention is used in particular in fuel storage injection systems, such as common rail systems. Through the inventive integration of the leakage connection and the electrical connection in a molded component, a particularly compact structure can be provided, which in particular provides space advantages in confined engine compartments. The invention is described below on the basis of a preferred exemplary embodiment in conjunction with the drawing. In the drawing is:
Figur 1 eine schematische, perspektivische Ansicht eines Injektors gemäß einem Ausführungsbeispiel der vorliegenden Erfindung,FIG. 1 shows a schematic, perspective view of an injector according to an exemplary embodiment of the present invention,
Figur 2 eine Seitenansicht des in Figur 1 gezeigten Injektors, undFigure 2 is a side view of the injector shown in Figure 1, and
Figur 3 eine teilweise geschnittene Seitenansicht des in Figur 2 gezeigten Injektors.Figure 3 is a partially sectioned side view of the injector shown in Figure 2.
Nachfolgend wird unter Bezugnahme auf die Figuren 1 bis 3 ein Injektor 1 gemäß einem Ausführungsbeispiel beschrieben. Wie in Figur 1 gezeigt, ist am Kopf 10 des Injektors 1 ein einstückiges Bauteil 2 mittels Spritzgießen befestigt. Das einstückige Bauteil 2 umfasst einen Leckageanschluss 3 sowie einen elektrischen Anschluss 7. Wie insbesondere aus Figur 1 und 2 ersichtlich ist, ist das Spritzbauteil 2 deckelartig über den Kopf 10 des Injektors 1 angespritzt. Hierbei ist das Spritzbauteil 2 um einen am stirnseitigen Ende des Kopfes 10 angeordneten Kraftstoffzulaufanschluss 8 herumgespritzt, sodass ein ringförmiger Hauptbereich 6 des Spritzbauteils 2 gebildet wird, von dem der Leckageanschluss 3 und der elektrische Anschluss 7 abgehen.An injector 1 according to an exemplary embodiment is described below with reference to FIGS. 1 to 3. As shown in FIG. 1, a one-piece component 2 is attached to the head 10 of the injector 1 by means of injection molding. The one-piece component 2 comprises a leakage connection 3 and an electrical connection 7. As can be seen in particular from FIGS. 1 and 2, the injection-molded component 2 is injection-molded over the head 10 of the injector 1. Here, the injection component 2 is sprayed around a fuel supply connection 8 arranged at the front end of the head 10, so that an annular main region 6 of the injection component 2 is formed, from which the leakage connection 3 and the electrical connection 7 depart.
Wie insbesondere aus den Figuren 2 und 3 ersichtlich ist, ist der Leckageanschluss 3 und der elektrische Anschluss 7 in einem Winkel α von ca. 45° zu einer Mittelachse X-X des Injektors angeordnet. Weiterhin ist der Leckageanschluss 3 zum e- lektrischen Anschluss 7 derart angeordnet, dass ihre beiden Mittelachsen in einer Ebene liegen. Mit anderen Worten ist der Leckageanschluss 3 um 180° versetzt zum elektrischen Anschluss 7 angeordnet (vgl. Figur 1). Da bei dem dargestellten Ausführungsbeispiel der Zulaufan- schluss 8, der elektrische Anschluss 7 und der Leckageanschluss 3 alle am Kopf 10 des Injektors angeordnet sind, wird ein besonders kompakter und schlanker Injektor 1 erhalten. Dabei kann der Injektor 1 auf Grund der Anordnung aller Anschlüsse an seinem oberen Ende insbesondere in verschiedene Motoren unterschiedlicher Hersteller mit unterschiedlichem Bauraumangebot eingebaut werden. Somit wird der erfindungsge- mäße Injektor universell einsetzbar, und es muss nicht für jeden Motorenhersteller ein besonderer Injektor bereitgehalten werden.As can be seen in particular from FIGS. 2 and 3, the leakage connection 3 and the electrical connection 7 are arranged at an angle α of approximately 45 ° to a central axis XX of the injector. Furthermore, the leakage connection 3 to the electrical connection 7 is arranged such that its two central axes lie in one plane. In other words, the leakage connection 3 is arranged offset by 180 ° to the electrical connection 7 (cf. FIG. 1). Since in the exemplary embodiment shown the inlet connection 8, the electrical connection 7 and the leakage connection 3 are all arranged on the head 10 of the injector, a particularly compact and slim injector 1 is obtained. Due to the arrangement of all connections at its upper end, the injector 1 can in particular be installed in different engines from different manufacturers with different installation space. Thus, the injector according to the invention can be used universally, and it is not necessary to have a special injector available for every engine manufacturer.
Da das einstückige Spritzteil 2 unmittelbar an den Injektor angespritzt ist, kann es nur noch vom Injektor entfernt werden, indem es zerstört wird. Durch dieses unmittelbare Anspritzen wird jedoch auch ein unbeabsichtigtes Lösen, z.B. infolge von Vibrationen o.a., verhindert.Since the one-piece molded part 2 is molded directly onto the injector, it can only be removed from the injector by being destroyed. However, this direct injection also prevents accidental loosening, e.g. due to vibrations or the like.
Wie insbesondere in Figur 3 gezeigt, ist eine im Injektor 1 angeordnete Leckageleitung 9 als einfache zylindrische Bohrung mit einer Fase an ihrem Ende ausgebildet. Da erfindungsgemäß der Leckageanschluss vollständig am Spritzbauteil ausgebildet ist, kann auf die im Stand der Technik aufwendig herzustellende und nachzubearbeitende Stufenbohrung im Injektorkopf verzichtet werden. Da es sich bei dem einstückigen Bauteil 2 um ein Spritzbauteil handelt, kann insbesondere die innere Ausnehmung 5 des Leckageanschlusses 3 auf einfache Weise, z.B. auch stufenförmig, gebildet werden.As shown in particular in FIG. 3, a leakage line 9 arranged in the injector 1 is designed as a simple cylindrical bore with a chamfer at its end. Since, according to the invention, the leakage connection is completely formed on the molded component, the stepped bore in the injector head, which is complex to manufacture and rework, can be dispensed with. Since the one-piece component 2 is an injection molded component, the inner recess 5 of the leakage connection 3 in particular can be easily, e.g. also step-like.
Am äußeren Umfang des Leckageanschlusses 3 ist, wie in den Figuren 2 und 3 gezeigt, eine umlaufende Nut 4 ausgebildet, welche zur Aufnahme eines Verriegelungselements dient, mit welcher eine Rücklaufleitung fixiert werden kann.On the outer circumference of the leakage connection 3, as shown in FIGS. 2 and 3, a circumferential groove 4 is formed, which serves to receive a locking element with which a return line can be fixed.
Da der Leckageanschluss 3 und der elektrische Anschluss 7 am ringförmigen Hauptbereich 6 im Wesentlichen einander gegenü- berliegend angeordnet sind, resultiert hieraus auch ein besonders einfacher Aufbau des Spritzwerkzeugs. Somit können in einem Arbeitsschritt die beiden Anschlüsse 3 und 7 erzeugt werden. Dabei ist der elektrische Anschluss 7 in bekannter Weise als Steckanschluss ausgebildet, sodass auch die anschließende Montage im Motor schnell und einfach ausgeführt werden kann.Since the leakage connection 3 and the electrical connection 7 on the ring-shaped main area 6 essentially face each other. Are arranged above, this also results in a particularly simple structure of the injection mold. The two connections 3 and 7 can thus be produced in one work step. The electrical connection 7 is designed in a known manner as a plug connection, so that the subsequent installation in the motor can also be carried out quickly and easily.
Somit betrifft die vorliegende Erfindung einen Injektor, ins- besondere für eine Speichereinspritzvorrichtung, mit einem Zulaufanschluss 8, einem Leckageanschluss 3 und einem elektrischen Anschluss 7. Der Leckageanschluss 3 und der elektrische Anschluss 7 sind als einstuckiges Spritzbauteil 2 ausgebildet, welches unmittelbar am Injektor 1 angespritzt ist.The present invention thus relates to an injector, in particular for an accumulator injection device, with an inlet connection 8, a leakage connection 3 and an electrical connection 7. The leakage connection 3 and the electrical connection 7 are designed as a one-piece injection-molded component 2 which is injection-molded directly onto the injector 1 is.
Die vorliegende Erfindung ist nicht auf das dargestellte Ausfuhrungsbeispiel beschrankt. Es können verschiedene Abweichungen und Änderungen ausgeführt werden, ohne den Erfin- dungsumfang zu verlassen. The present invention is not limited to the exemplary embodiment shown. Various deviations and changes can be carried out without leaving the scope of the invention.

Claims

Patentansprüche claims
1. Injektor, insbesondere für eine Speichereinspritzvorrichtung, umfassend einen Zulaufanschluss (8), einen Leckageanschluss (3) und einen elektrischen Anschluss (7), dadurch gekennzeichnet, dass der Leckageanschluss (3) und der elektrische Anschluss (7) als einstückes Spritzbauteil (2) ausgebildet sind, welches unmittelbar an den Injektor (1) angespritzt ist.1. Injector, in particular for a storage injection device, comprising an inlet connection (8), a leakage connection (3) and an electrical connection (7), characterized in that the leakage connection (3) and the electrical connection (7) as a one-piece injection-molded component (2 ) are formed, which is injection molded directly onto the injector (1).
2. Injektor nach Anspruch 1, dadurch gekennzeichnet, dass das Spritzbauteil 2 aus Kunststoff hergestellt ist.2. Injector according to claim 1, characterized in that the injection component 2 is made of plastic.
3. Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Leckageanschluss (3) um 180° versetzt zum elektrischen Anschluss (7) angeordnet ist.3. Injector according to one of the preceding claims, characterized in that the leakage connection (3) is arranged offset by 180 ° to the electrical connection (7).
4. Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das einstückige Spritzbauteil (2) am Kopf (10) des Injektors (1) angeordnet ist.4. Injector according to one of the preceding claims, characterized in that the one-piece injection component (2) is arranged on the head (10) of the injector (1).
5. Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Zulaufanschluss (8) am stirnseitigen Ende des Kopfes (10) des Injektors angeordnet ist.5. Injector according to one of the preceding claims, characterized in that the inlet connection (8) is arranged at the front end of the head (10) of the injector.
6. Injektor nach Anspruch 5, dadurch gekennzeichnet, dass das einstückige Spritzbauteil (2) um den Zulaufanschluss (8) herum angeordnet ist.6. Injector according to claim 5, characterized in that the one-piece injection component (2) is arranged around the inlet connection (8).
7. Injektor nach einem der vorhergehenden Ansprüche, da- durch gekennzeichnet, dass eine Leckagerücklaufbohrung (9) im Injektor (1) als einfache zylindrische Bohrung ausgebildet ist. 7. Injector according to one of the preceding claims, characterized in that a leakage return bore (9) in the injector (1) is designed as a simple cylindrical bore.
8. Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass am Außenumfang des Leckageanschlusses (3) eine umlaufende Aussparung (4) ausgebildet ist, um eine Verriegelungsvorrichtung zu befestigen.8. Injector according to one of the preceding claims, characterized in that a circumferential recess (4) is formed on the outer circumference of the leakage connection (3) in order to fasten a locking device.
9. Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Leckageanschluss (3) und der elektrische Anschluss (7) in einem Winkel (α) von ca. 45° zu einer Mittelachse (X-X) des Injektors angeordnet ist.9. Injector according to one of the preceding claims, characterized in that the leakage connection (3) and the electrical connection (7) is arranged at an angle (α) of approximately 45 ° to a central axis (X-X) of the injector.
10. Injektor nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das einstuckige Spritzbauteil (2) das stirnseitige Ende des Kopfes (10) des Injektors vollständig deckelartig überdeckt.10. Injector according to one of claims 1 to 4, characterized in that the one-piece injection component (2) covers the front end of the head (10) of the injector completely like a lid.
11. Leckageanschluss zur Befestigung einer Leckageleitung an einem Injektor (1), dadurch gekennzeichnet, dass der Leckageanschluss (3) und ein elektrischer Anschluss (7) des Injektors an einem einstuckigen Spritzbauteil (2) ausgebildet sind, wobei das einstückige Spritzbauteil (2) unmittelbar an den Injektor (1) ange- spritzt ist.11. Leakage connection for fastening a leakage line to an injector (1), characterized in that the leakage connection (3) and an electrical connection (7) of the injector are formed on a one-piece injection-molded component (2), the one-piece injection-molded component (2) directly is injected onto the injector (1).
12. Leckageanschluss nach Anspruch 11, dadurch gekennzeichnet, dass der Leckageanschluss (3) in einer um 180° entgegengesetzten Richtung am einstuckigen Spritz- bauteil (2) ausgebildet ist, als der elektrische Anschluss (7) .12. Leakage connection according to claim 11, characterized in that the leakage connection (3) is formed in an opposite direction by 180 ° on the one-piece injection molded part (2) than the electrical connection (7).
13. Leckageanschluss nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass der Leckageanschluss (3) und der elektrische Anschluss (7) in einem Winkel (α) von ungefähr 45° zu einer Mittelachse (X-X) des Injektors angeordnet sind. 13. Leakage connection according to claim 11 or 12, characterized in that the leakage connection (3) and the electrical connection (7) are arranged at an angle (α) of approximately 45 ° to a central axis (XX) of the injector.
4. Leckageanschluss nach einem der Ansprüche 11 bis 13, dadurch gekennzeichnet, dass der Leckageanschluss (3) und der elektrische Anschluss (7) mittels Spritzgießen eines Kunststoffes in einem Arbeitsschritt vollständig hergestellt sind. 4. Leakage connection according to one of claims 11 to 13, characterized in that the leakage connection (3) and the electrical connection (7) are completely produced in one work step by means of injection molding of a plastic.
EP03708038A 2002-02-19 2003-02-18 Injector with improved connecting geometry Expired - Fee Related EP1476653B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10206908A DE10206908B4 (en) 2002-02-19 2002-02-19 Injector with improved connection geometry
DE10206908 2002-02-19
PCT/DE2003/000507 WO2003071123A1 (en) 2002-02-19 2003-02-18 Injector with improved connecting geometry

Publications (2)

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EP1476653A1 true EP1476653A1 (en) 2004-11-17
EP1476653B1 EP1476653B1 (en) 2008-12-24

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US (1) US7815131B2 (en)
EP (1) EP1476653B1 (en)
JP (1) JP4181505B2 (en)
DE (2) DE10206908B4 (en)
WO (1) WO2003071123A1 (en)

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DE102009002128A1 (en) * 2009-04-02 2010-10-14 Robert Bosch Gmbh Fuel injector

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DE50310975D1 (en) 2009-02-05
EP1476653B1 (en) 2008-12-24
DE10206908B4 (en) 2010-01-07
DE10206908A1 (en) 2003-09-04
JP4181505B2 (en) 2008-11-19
US7815131B2 (en) 2010-10-19
WO2003071123A1 (en) 2003-08-28
US20040231637A1 (en) 2004-11-25
JP2005526208A (en) 2005-09-02

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