EP3026253A1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP3026253A1
EP3026253A1 EP15190155.0A EP15190155A EP3026253A1 EP 3026253 A1 EP3026253 A1 EP 3026253A1 EP 15190155 A EP15190155 A EP 15190155A EP 3026253 A1 EP3026253 A1 EP 3026253A1
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EP
European Patent Office
Prior art keywords
housing
region
fuel injector
injector
sensor element
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
EP15190155.0A
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German (de)
French (fr)
Other versions
EP3026253B1 (en
Inventor
Andreas Hielscher
Holger Rapp
Torsten Leukert
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
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Publication of EP3026253A1 publication Critical patent/EP3026253A1/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
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • 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
    • F02M65/003—Measuring variation of fuel pressure in high pressure line
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/247—Pressure sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8038—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of adhesives, glue or the like

Definitions

  • the invention relates to a fuel injector, in particular a common rail injector, according to the preamble of claim 1.
  • a fuel injector according to the preamble of claim 1 is from the post-published DE 10 2014 209330 A1 the applicant known.
  • a measuring device with a sensor element which is arranged in the region of a supply bore on the injector housing is used in particular for detecting the point in time of the closing of the nozzle needle when it hits its seat in the injector housing and thereby at least indirectly closes the injection opening formed in the injector housing ,
  • the supply bore supplies a high-pressure space, in which the nozzle needle is arranged, with fuel under high pressure.
  • the injector housing in the region of the measuring device on a deformation region which is formed elastically deformable in dependence on the fuel pressure in the supply bore.
  • the deformation area bulges outwards, which can be detected by means of the sensor element.
  • the sensor element is connected to the deformation region by means of an adhesive bond and designed to detect strains or tensile stresses occurring in the contact region to the injector housing, wherein the size or height of the strains is dependent on the pressure in the supply bore.
  • Characteristic of the above-mentioned closing the injection openings through the nozzle needle is that thereby takes place (relatively strong or faster) pressure increase in the supply line, since no more fuel is discharged through the injection openings, wherein the pressure increase is detected by the sensor element.
  • the adhesive bond is exposed not only to different temperatures, but also other environmental influences such as, in particular, soiling or gases which, depending on the composition, can adversely affect the fatigue strength of the adhesive bond.
  • the invention has the object to protect the region of the adhesive bond between the deformation region and the sensor element from external influences or media that over the prior art, an improved durability, in particular over the life of the fuel injector is achieved.
  • a fuel injector with the characterizing features of claim 1, characterized in that at least the region of the adhesive bond between the deformation region and the sensor element is enclosed by a housing member which seals at least the area of the adhesive bond against the outside environment media-tight.
  • a housing member which seals at least the area of the adhesive bond against the outside environment media-tight.
  • the housing element is filled with an inert gas in the area between the housing element and the adhesive connection.
  • Suitable inert gases include, for example, noble gases (Ne, Ar) or chemically particularly inert gas compounds (CO 2 , SF 6 , or the like). It is particularly preferred to introduce the inert gas into the housing element during the production process.
  • the housing element by means of a welded joint with the Injector housing is connected, wherein the welding takes place in the desired inert atmosphere.
  • the housing element is evacuated in the region between the housing element and the adhesive bond.
  • this is cup-shaped and surrounds the measuring device completely, with the exception of the deformation region.
  • the housing element has a flange-like area with a connection surface, wherein the connection surface by means of a welded or adhesive connection, preferably by means of a laser weld, is connected to the injector.
  • the welding of the housing element to the injector housing preferably takes place either under an inert atmosphere or under a vacuum.
  • connection elements or connecting cables For electrical contacting of the sensor element, it is necessary to connect this with corresponding connection elements or connecting cables.
  • connection elements or connecting cables For this purpose, it is provided in a further constructive embodiment of the invention that in a wall of the housing element at least one opening for carrying out an electrical contacting of the sensor element is formed, wherein the at least one opening is formed sealed.
  • the particular advantage is achieved that a directed in the direction of the sensor element force is generated, which can be used in addition to contacting.
  • At least one of the electrical contact of the sensor element serving, elastically arranged contact element is provided within the housing, which is in electrical operative connection with the sensor element, in particular with the adhesive side of the opposite side of the sensor element connected ,
  • the sensor element is designed as a piezoelectric element.
  • a design of the sensor element as a piezoelectric element has the advantage that such piezoelectric elements can be produced with relatively low costs and are very well suited for the detection of the deformations of the deformation region in question with respect to the resolution or measurement accuracy and sampling rate.
  • the arrangement of the deformation region in the region of the supply bore or a branch arranged in operative connection with the supply bore is particularly preferred.
  • This has the advantage that the connection point between the deformation region and the sensor element can be arranged in a region relatively distant from the combustion chamber, in which lower temperatures prevail, in particular during operation of the internal combustion engine, than in a region of the injector housing which is close to the combustion chamber.
  • the connection between the addressed components thermally relatively little claimed.
  • a structural design of the deformation region in the region of a blind-hole-shaped depression or a flattening of the injector housing is preferred. Both variants can manufacture particularly simple and accurate manufacture and also allow the formation of a flat surface for mounting the sensor element by means of the adhesive connection in a relatively simple manner.
  • the Indian Fig. 1 fuel injector 10 shown greatly simplified is designed as a so-called common rail injector, and is used to inject fuel into the combustion chamber, not shown, of an internal combustion engine, in particular a self-igniting internal combustion engine.
  • the fuel injector 10 has an essentially made of metal, possibly multi-part design injector housing 11, in which on the combustion chamber of the internal combustion engine side facing at least one, preferably a plurality of injection openings 12 are arranged for injecting the fuel. Within the injector housing 11, this forms a high-pressure chamber 15, in which a nozzle needle 16 serving as an injection member is arranged in a liftable manner in the direction of the double arrow 17.
  • lowered Position of the nozzle needle 16 forms this together with the inner wall of the high-pressure chamber 15 and the injector 11 a sealing seat, so that the injection openings 12 are at least indirectly closed, such that the injection of fuel from the high-pressure chamber 15 is avoided in the combustion chamber of the internal combustion engine ,
  • this releases the injection openings 12 for injecting the fuel into the combustion chamber of the internal combustion engine.
  • the movement of the nozzle needle 16, in particular for releasing the injection openings 12 takes place in a manner known per se by means of an actuator, not shown, which can be actuated via a voltage supply line 18 by a control device of the internal combustion engine.
  • the actuator may in particular be a magnetic actuator or else a piezoactuator.
  • the supply bore 19 is also connected via a fuel connection, not shown, with a fuel line 22, which in turn is coupled to a fuel reservoir 25 (rail).
  • a blind hole-shaped recess 24 is formed, so that the wall thickness of the injector 11 is reduced in the region of the recess 24.
  • the injector housing 11 may also have a flattening, in the region of which the wall thickness of the injector housing 11 is reduced.
  • the flat bottom 26 of the recess 24 forms part of a deformation region 27.
  • the injector 11 is for example in operative connection arranged with a branch 28, which in turn opens into the supply hole 19.
  • the fuel pressure currently prevailing in the supply bore 19 also acts in the injector housing 11 on the side facing away from the recess 24.
  • the wall section 29 of the injector housing 11 acts on the recess 24 facing side as a deformation region 27 in the manner of an elastically deformable membrane, wherein the deformation, which forms as a curvature, the higher the instantaneous fuel pressure in the supply bore 19 or the branch 28 is, the greater.
  • the fuel injector 10 has a measuring device 30 on.
  • the measuring device 30 comprises a sensor element 32 designed as a piezo element 31.
  • the piezoelectric element 31 is connected to the deformation region 27 via a material connection in the form of an adhesive connection 34.
  • the adhesive bond 34 is formed over a portion of the surface of the bottom 26 of the recess 24, such that a radially encircling, adhesive-free region 36 is formed between the adhesive bond 34 and a peripheral wall 35 delimiting the recess 24.
  • the piezoelectric element 31, in particular having a round cross-section, or the measuring device 30 is protected against external environmental influences by means of a pot-shaped or cup-shaped housing 40 with a preferably round cross-section.
  • the housing 40 on the base 26 of the recess 24 facing side by way of example a flange-like peripheral edge portion 41 which is connected to the bottom 26 of the recess 24 in the adhesive-free region 36.
  • Particularly preferred for connecting the housing 40 to the injector housing 11 or the base 26 of the recess 24 is the formation of a welded connection, in particular a laser welding connection, such that a completely circumferential laser weld seam 42 is produced.
  • the formation of the welded connection or the laser weld seam 42 takes place according to the invention in an inert atmosphere, or under vacuum, so that in the interior 44 of the housing 40, that is, in particular in the region between the housing 40 and the adhesive connection 34 either an inert gas, or vacuum is formed.
  • the housing 40 which consists in particular of metal, has two apertures 46, 47 in a wall 45 arranged approximately parallel to the surface of the sensor element 32, through which either electrically sealed connecting leads 48, 49 are guided, which are connected to the sensor element 32 or the piezo element 31 are connected, or two plug elements, which on the piezoelectric element 31 side facing, ie within the interior space 45 of the housing 40, with elastically formed contact elements 53, 54, for example in the form of compression springs, are connected.
  • the contact elements 53, 54 are electrically conductive on the surface of the piezoelectric element 31, in particular in the region of arranged there electrodes of the piezoelectric element 31 (not shown) to the voltages generated by the piezoelectric element 31 in a deformation via the connecting lines 48, 49 a supply not shown control or evaluation.
  • the deformation region 27 elastically deforms outward as a function of the fuel pressure prevailing in the supply bore 19. This deformation is transmitted via the adhesive bond 34 to the piezoelectric element 31 and there generates, depending on the deformation or the tensile stresses, electrical voltages which can be used by means of a suitable evaluation circuit to close at least indirectly on a position of the nozzle needle 16 in the injector housing 11 ,
  • the fuel injector 10 described so far can be modified or modified in many ways, without departing from the spirit, so in particular the shape or structure of the piezoelectric element 31 may differ from the illustrated embodiments.

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

Abstract

Die Erfindung betrifft einen Kraftstoffinjektor (10), insbesondere Common-Rail-Injektor, mit einem Injektorgehäuse (11), in dem ein Hochdruckraum (15) ausgebildet ist, der über eine im Injektorgehäuse (11) angeordnete Versorgungsbohrung (19) mit unter Druck stehendem Kraftstoff versorgbar ist, mit wenigstens einer zumindest mittelbar mit dem Hochdruckraum (15) verbundenen, im Injektorgehäuse (11) ausgebildeten Einspritzöffnung (12) zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine, mit einem die wenigstens eine Einspritzöffnung (12) freigebenden oder verschließenden Einspritzglied (16), und mit einer Messeinrichtung (30) zur zumindest mittelbaren Erfassung des Drucks im Hochdruckraum (15) oder der Versorgungsbohrung (19), wobei die Messeinrichtung (30) dazu ausgebildet ist, eine elastische Verformung eines zumindest mittelbar mit der Versorgungsbohrung (19) oder dem Hochdruckraum (15) in Wirkverbindung angeordneten Verformungsbereichs (27) zu erfassen, und wobei die Messeinrichtung (30) ein Sensorelement (32) aufweist, das mit der Oberfläche des Verformungsbereichs (27) über eine Klebeverbindung (34) verbunden ist. Erfindungsgemäß ist es vorgesehen, dass zumindest der Bereich der Klebeverbindung (34) zwischen dem Verformungsbereich (27) und dem Sensorelement (32) von einem Gehäuseelement (40) umschlossen ist, das zumindest den Bereich der Klebeverbindung (34) gegenüber der äußeren Umgebung mediendicht abdichtet.The invention relates to a fuel injector (10), in particular a common rail injector, with an injector housing (11) in which a high-pressure chamber (15) is formed which has a supply bore (19) arranged under pressure in the supply housing (11) Fuel is supplied with at least one at least indirectly with the high-pressure chamber (15) connected in the injector (11) formed injection port (12) for injecting fuel into the combustion chamber of an internal combustion engine, with an at least one injection port (12) releasing or occluding injection member (16), and with a measuring device (30) for at least indirect detection of the pressure in the high pressure chamber (15) or the supply bore (19), wherein the measuring device (30) is adapted to an elastic deformation of at least indirectly with the supply bore (19 ) or the high-pressure chamber (15) in operative connection arranged deformation region (27) to detect, and wherein the measuring device (30) has a sensor element (32) which is connected to the surface of the deformation region (27) via an adhesive connection (34). According to the invention, at least the region of the adhesive bond (34) between the deformation region (27) and the sensor element (32) is enclosed by a housing element (40) which seals at least the area of the adhesive bond (34) against the external environment in a media-tight manner ,

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen Kraftstoffinjektor, insbesondere einen Common-Rail-Injektor, nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injector, in particular a common rail injector, according to the preamble of claim 1.

Ein Kraftstoffinjektor nach dem Oberbegriff des Anspruchs 1 ist aus der nachveröffentlichten DE 10 2014 209330 A1 der Anmelderin bekannt. Bei dem bekannten Kraftstoffinjektor wird insbesondere zur Erkennung des Zeitpunkts des Schließens der Düsennadel, bei dem diese auf ihren Sitz im Injektorgehäuse auftrifft und dadurch im Injektorgehäuse ausgebildete Einspritzöffnung zumindest mittelbar verschließt, eine Messeinrichtung mit einem Sensorelement verwendet, das im Bereich einer Versorgungsbohrung am Injektorgehäuse angeordnet ist. Die Versorgungsbohrung versorgt einen Hochdruckraum, in dem auch die Düsennadel angeordnet ist, mit unter Hochdruck stehendem Kraftstoff. Insbesondere weist das Injektorgehäuse im Bereich der Messeinrichtung einen Verformungsbereich auf, der in Abhängigkeit des Kraftstoffdrucks in der Versorgungsbohrung elastisch deformierbar ausgebildet ist. Bei einer Druckerhöhung in der Versorgungsbohrung wölbt sich der Verformungsbereich nach außen hin, was mittels des Sensorelements detektierbar ist. Das Sensorelement ist mittels einer Klebeverbindung mit dem Verformungsbereich verbunden und dazu ausgebildet, in dem Kontaktbereich zum Injektorgehäuse auftretende Dehnungen bzw. Zugspannungen zu erfassen, wobei die Größe bzw. Höhe der Dehnungen in Abhängigkeit von dem Druck in der Versorgungsbohrung ist. Charakteristisch beim angesprochenen Verschließen der Einspritzöffnungen durch die Düsennadel ist es, dass dadurch ein (relativ starker bzw. schneller) Druckanstieg in der Versorgungsleitung stattfindet, da kein Kraftstoff mehr über die Einspritzöffnungen abgegeben wird, wobei der Druckanstieg mittels des Sensorelements erfasst wird.A fuel injector according to the preamble of claim 1 is from the post-published DE 10 2014 209330 A1 the applicant known. In the case of the known fuel injector, a measuring device with a sensor element which is arranged in the region of a supply bore on the injector housing is used in particular for detecting the point in time of the closing of the nozzle needle when it hits its seat in the injector housing and thereby at least indirectly closes the injection opening formed in the injector housing , The supply bore supplies a high-pressure space, in which the nozzle needle is arranged, with fuel under high pressure. In particular, the injector housing in the region of the measuring device on a deformation region which is formed elastically deformable in dependence on the fuel pressure in the supply bore. With an increase in pressure in the supply bore, the deformation area bulges outwards, which can be detected by means of the sensor element. The sensor element is connected to the deformation region by means of an adhesive bond and designed to detect strains or tensile stresses occurring in the contact region to the injector housing, wherein the size or height of the strains is dependent on the pressure in the supply bore. Characteristic of the above-mentioned closing the injection openings through the nozzle needle is that thereby takes place (relatively strong or faster) pressure increase in the supply line, since no more fuel is discharged through the injection openings, wherein the pressure increase is detected by the sensor element.

Während des Betriebs der Brennkraftmaschine ist die Klebeverbindung nicht nur unterschiedlichen Temperaturen ausgesetzt, sondern auch anderen Umwelteinflüssen wie insbesondere Verschmutzungen oder Gasen, die je nach Zusammensetzung die Dauerfestigkeit der Klebeverbindung negativ beeinflussen können.During operation of the internal combustion engine, the adhesive bond is exposed not only to different temperatures, but also other environmental influences such as, in particular, soiling or gases which, depending on the composition, can adversely affect the fatigue strength of the adhesive bond.

Offenbarung der ErfindungDisclosure of the invention

Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, den Bereich der Klebeverbindung zwischen dem Verformungsbereich und dem Sensorelement derart vor äußeren Einflüssen bzw. Medien zu schützen, dass gegenüber dem Stand der Technik eine verbesserte Haltbarkeit, insbesondere über die Lebensdauer des Kraftstoffinjektors betrachtet, erzielt wird.Based on the illustrated prior art, the invention has the object to protect the region of the adhesive bond between the deformation region and the sensor element from external influences or media that over the prior art, an improved durability, in particular over the life of the fuel injector is achieved.

Diese Aufgabe wird erfindungsgemäß bei einem Kraftstoffinjektor mit den kennzeichnenden Merkmalen des Anspruchs 1 dadurch gelöst, dass zumindest der Bereich der Klebeverbindung zwischen dem Verformungsbereich und dem Sensorelement von einem Gehäuseelement umschlossen ist, das zumindest den Bereich der Klebeverbindung gegenüber der äußeren Umgebung mediendicht abdichtet. Durch das erfindungsgemäß vorgesehene Gehäuseelement wird insbesondere der Bereich der Klebeverbindung des Sensorelements vor Umwelteinflüssen wie Schmutz, Feuchtigkeit, Öl oder ähnlichen Medien geschützt.This object is achieved in a fuel injector with the characterizing features of claim 1, characterized in that at least the region of the adhesive bond between the deformation region and the sensor element is enclosed by a housing member which seals at least the area of the adhesive bond against the outside environment media-tight. By means of the housing element provided according to the invention, in particular the region of the adhesive bond of the sensor element is protected against environmental influences such as dirt, moisture, oil or similar media.

Vorteilhafte Weiterbildungen des erfindungsgemäßen Kraftstoffinjektors sind in den Unteransprüchen angeführt.Advantageous developments of the fuel injector according to the invention are given in the dependent claims.

Ganz besonders bevorzugt ist es, wenn das Gehäuseelement in dem Bereich zwischen dem Gehäuseelement und der Klebeverbindung mit einem inerten Gas gefüllt ist. Als inerte Gase kommen z.B. Edelgase (Ne, Ar) oder chemisch besonders träge Gasverbindungen (CO2, SF6, o.ä.) in Frage. Besonders bevorzugt ist es dabei, das inerte Gas während des Produktionsprozesses in das Gehäuseelement einzubringen. Insbesondere kann es dabei vorgesehen sein, dass das Gehäuseelement mittels einer Schweißverbindung mit dem Injektorgehäuse verbunden wird, wobei das Schweißen in der gewünschten Inertatmosphäre stattfindet.It is very particularly preferred if the housing element is filled with an inert gas in the area between the housing element and the adhesive connection. Suitable inert gases include, for example, noble gases (Ne, Ar) or chemically particularly inert gas compounds (CO 2 , SF 6 , or the like). It is particularly preferred to introduce the inert gas into the housing element during the production process. In particular, it can be provided that the housing element by means of a welded joint with the Injector housing is connected, wherein the welding takes place in the desired inert atmosphere.

In alternativer Ausgestaltung kann es vorgesehen sein, dass das Gehäuseelement in dem Bereich zwischen dem Gehäuseelement und der Klebeverbindung evakuiert ist. Auch hier ist es wiederum vorteilhaft, das Evakuieren während des Herstellprozesses des Kraftstoffinjektors, insbesondere während der Verbindung des Gehäuseelements mit dem Injektorelement dadurch auszugestalten, dass das Verbinden (Verschweißen oder Verkleben) des Gehäuseelements mit dem Injektorgehäuse unter Vakuum erfolgt.In an alternative embodiment, it can be provided that the housing element is evacuated in the region between the housing element and the adhesive bond. Again, it is advantageous in turn to design the evacuation during the manufacturing process of the fuel injector, in particular during the connection of the housing element with the injector element in that the bonding (welding or bonding) of the housing element takes place with the injector under vacuum.

In konstruktiv bevorzugter Ausgestaltung des Gehäuseelements ist dieses becherförmig ausgebildet und umgibt die Messeinrichtung vollständig, mit Ausnahme des Verformungsbereichs. Dadurch wird nicht nur der unmittelbare Bereich der Klebeverbindung zwischen dem Verformungsbereich und dem Sensorelement vor unerwünschten Umwelteinflüssen geschützt, sondern insgesamt gesehen die Messeinrichtung.In a structurally preferred embodiment of the housing element, this is cup-shaped and surrounds the measuring device completely, with the exception of the deformation region. As a result, not only the immediate area of the adhesive bond between the deformation region and the sensor element is protected against undesired environmental influences, but overall the measuring device is protected.

Um zwischen dem Gehäuseelement und dem Injektorgehäuse auf besonders einfache Art und Weise eine haltbare, feste und mediendichte Verbindung auszubilden, kann es vorgesehen sein, dass das Gehäuseelement einen flanschartig umlaufenden Bereich mit einer Verbindungsfläche aufweist, wobei die Verbindungsfläche mittels einer Schweiß- oder Klebeverbindung, vorzugsweise mittels einer Laserschweißnaht, mit dem Injektorgehäuse verbunden ist. Wie oben bereits erläutert findet das Verschweißen des Gehäuseelements mit dem Injektorgehäuse bevorzugt entweder unter einer inerten Atmosphäre oder aber unter Vakuum statt.In order to form a durable, firm and media-tight connection between the housing element and the injector housing in a particularly simple manner, it can be provided that the housing element has a flange-like area with a connection surface, wherein the connection surface by means of a welded or adhesive connection, preferably by means of a laser weld, is connected to the injector. As already explained above, the welding of the housing element to the injector housing preferably takes place either under an inert atmosphere or under a vacuum.

Zur elektrischen Kontaktierung des Sensorelements ist es erforderlich, dieses mit entsprechenden Anschlusselementen bzw. Anschlussleitungen zu verbinden. Hierzu ist es in einer weiteren konstruktiven Ausgestaltung der Erfindung vorgesehen, dass in einer Wand des Gehäuseelements wenigstens ein Durchbruch zur Durchführung einer elektrischen Kontaktierung des Sensorelements ausgebildet ist, wobei der wenigstens eine Durchbruch abgedichtet ausgebildet ist. Insbesondere in Verbindung mit einer Schweißverbindung zwischen dem Gehäuseelement und dem Injektorgehäuse, die unter Vakuum ausgebildet wird, wird dadurch der besondere Vorteil erzielt, dass eine in der Richtung auf das Sensorelement gerichtete Kraft erzeugt wird, die zusätzlich zur Kontaktierung genutzt werden kann.For electrical contacting of the sensor element, it is necessary to connect this with corresponding connection elements or connecting cables. For this purpose, it is provided in a further constructive embodiment of the invention that in a wall of the housing element at least one opening for carrying out an electrical contacting of the sensor element is formed, wherein the at least one opening is formed sealed. Particularly in connection with a welded connection between the housing element and the injector housing, which is formed under vacuum, the particular advantage is achieved that a directed in the direction of the sensor element force is generated, which can be used in addition to contacting.

In Weiterbildung des zuletzt genannten Erfindungsgedankens kann es vorgesehen sein, dass innerhalb des Gehäuses wenigstens ein der elektrischen Kontaktierung des Sensorelements dienendes, elastisch angeordnetes Kontaktelement vorgesehen ist, das in elektrischer Wirkverbindung mit dem Sensorelement, insbesondere mit der der Klebeverbindung gegenüberliegenden Seite des Sensorelements, verbunden ist. Durch das wenigstens eine elastisch angeordnete Kontaktelement wird dabei eine stetige Anlage des Kontaktelements an dem Sensorelement ermöglicht, auch wenn dieses im Verformungsbereich bei einer Druckerhöhung relativ stark ausgelenkt wird, wodurch der Abstand zwischen dem Sensorelement und dem Durchbruch beispielsweise verringert ist.In a further development of the last-mentioned concept of the invention it can be provided that at least one of the electrical contact of the sensor element serving, elastically arranged contact element is provided within the housing, which is in electrical operative connection with the sensor element, in particular with the adhesive side of the opposite side of the sensor element connected , By the at least one elastically arranged contact element while a steady contact of the contact element is made possible on the sensor element, even if this is relatively strongly deflected in the deformation region at a pressure increase, whereby the distance between the sensor element and the breakthrough is reduced, for example.

Insbesondere ist es vorgesehen, dass das Sensorelement als Piezoelement ausgebildet ist. Eine Ausbildung des Sensorelements als Piezoelement hat den Vorteil, dass derartige Piezoelemente mit relativ geringen Kosten herstellbar sind und bezüglich der Auflösung bzw. Messgenauigkeit sowie Tastrate sich sehr gut zur Detektion der in Frage kommenden Deformationen des Verformungsbereichs eignen.In particular, it is provided that the sensor element is designed as a piezoelectric element. A design of the sensor element as a piezoelectric element has the advantage that such piezoelectric elements can be produced with relatively low costs and are very well suited for the detection of the deformations of the deformation region in question with respect to the resolution or measurement accuracy and sampling rate.

Besonders bevorzugt ist die Anordnung des Verformungsbereichs im Bereich der Versorgungsbohrung oder eines mit der Versorgungsbohrung in Wirkverbindung angeordneten Abzweigs. Dies hat den Vorteil, dass die Verbindungsstelle zwischen dem Verformungsbereich und dem Sensorelement in einem relativ brennraumfernen Bereich angeordnet werden kann, in dem insbesondere während des Betriebs der Brennkraftmaschine geringere Temperaturen herrschen als in einem relativ brennraumnahen Bereich des Injektorgehäuses. Dadurch wird insbesondere auch die Verbindung zwischen den angesprochenen Bauteilen thermisch relativ wenig beansprucht. Bei Verwendung eines Abzweigs wird darüber hinaus der besondere Vorteil erzielt, dass trotz der brennraumfernen Anordnung des Sensorelements dieses an nahezu beliebigem Ort in Umfangsrichtung des Injektorgehäuses angeordnet werden kann. Bevorzugt ist darüber hinaus eine konstruktive Ausbildung des Verformungsbereichs im Bereich einer sacklochförmigen Vertiefung oder einer Abflachung des Injektorgehäuses. Beide Varianten lassen sich herstellungstechnisch besonders einfach und genau herstellen und ermöglichen darüber hinaus auf relativ einfache Art und Weise die Ausbildung einer ebenen Fläche zur Anbringung des Sensorelements mittels der Klebeverbindung.Particularly preferred is the arrangement of the deformation region in the region of the supply bore or a branch arranged in operative connection with the supply bore. This has the advantage that the connection point between the deformation region and the sensor element can be arranged in a region relatively distant from the combustion chamber, in which lower temperatures prevail, in particular during operation of the internal combustion engine, than in a region of the injector housing which is close to the combustion chamber. As a result, in particular, the connection between the addressed components thermally relatively little claimed. When using a branch beyond the particular advantage is achieved that despite the combustion chamber distant arrangement of the sensor element can be arranged at almost any location in the circumferential direction of the injector. In addition, a structural design of the deformation region in the region of a blind-hole-shaped depression or a flattening of the injector housing is preferred. Both variants can manufacture particularly simple and accurate manufacture and also allow the formation of a flat surface for mounting the sensor element by means of the adhesive connection in a relatively simple manner.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung.Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing.

Diese zeigt in:

Fig. 1
eine stark vereinfachte, teilweise geschnittene Seitenansicht eines erfindungsgemäßen Kraftstoffinjektors mit einer Messeinrichtung zur zumindest mittelbaren Erfassung des Kraftstoffdrucks im Kraftstoffinjektor und
Fig. 2
einen Längsschnitt im Verbindungsbereich zwischen der Messeinrichtung und dem Injektorgehäuse in vergrößerter Darstellung.
This shows in:
Fig. 1
a greatly simplified, partially sectioned side view of a fuel injector according to the invention with a measuring device for at least indirectly detecting the fuel pressure in the fuel injector and
Fig. 2
a longitudinal section in the connecting region between the measuring device and the injector in an enlarged view.

Gleiche Elemente bzw. Elemente mit gleicher Funktion sind in den Figuren mit den gleichen Bezugsziffern versehen.The same elements or elements with the same function are provided in the figures with the same reference numerals.

Der in der Fig. 1 stark vereinfacht dargestellte Kraftstoffinjektor 10 ist als sogenannter Common-Rail-Injektor ausgebildet, und dient dem Einspritzen von Kraftstoff in den nicht gezeigten Brennraum einer Brennkraftmaschine, insbesondere einer selbstzündenden Brennkraftmaschine.The Indian Fig. 1 fuel injector 10 shown greatly simplified is designed as a so-called common rail injector, and is used to inject fuel into the combustion chamber, not shown, of an internal combustion engine, in particular a self-igniting internal combustion engine.

Der Kraftstoffinjektor 10 weist ein im Wesentlichen aus Metall bestehendes, ggf. mehrteilig ausgebildetes Injektorgehäuse 11 auf, in dem auf der dem Brennraum der Brennkraftmaschine zugewandten Seite wenigstens eine, vorzugsweise mehrere Einspritzöffnungen 12 zum Einspritzen des Kraftstoffs eingeordnet sind. Innerhalb des Injektorgehäuses 11 bildet dieses einen Hochdruckraum 15 aus, in dem eine als Einspritzglied dienende Düsennadel 16 in Richtung des Doppelpfeils 17 hubbeweglich angeordnet ist. In der dargestellten, abgesenkten Stellung der Düsennadel 16 bildet diese zusammen mit der Innenwand des Hochdruckraums 15 bzw. des Injektorgehäuses 11 einen Dichtsitz aus, so dass die Einspritzöffnungen 12 zumindest mittelbar verschlossen sind, derart, dass das Einspritzen von Kraftstoff aus dem Hochdruckraum 15 in den Brennraum der Brennkraftmaschine vermieden wird. In der anderen, nicht dargestellten, von dem Dichtsitz abgehobenen Position der Düsennadel 16 gibt diese die Einspritzöffnungen 12 zum Einspritzen des Kraftstoffs in den Brennraum der Brennkraftmaschine frei. Die Bewegung der Düsennadel 16, insbesondere zum Freigeben der Einspritzöffnungen 12, erfolgt auf eine an sich bekannte Art und Weise mittels eines nicht dargestellten Aktuators, der über eine Spannungsversorgungsleitung 18 von einer Steuereinrichtung der Brennkraftmaschine ansteuerbar ist. Bei dem Aktuator kann es sich insbesondere um einen Magnetaktuator oder aber um einen Piezoaktuator handeln.The fuel injector 10 has an essentially made of metal, possibly multi-part design injector housing 11, in which on the combustion chamber of the internal combustion engine side facing at least one, preferably a plurality of injection openings 12 are arranged for injecting the fuel. Within the injector housing 11, this forms a high-pressure chamber 15, in which a nozzle needle 16 serving as an injection member is arranged in a liftable manner in the direction of the double arrow 17. In the illustrated, lowered Position of the nozzle needle 16 forms this together with the inner wall of the high-pressure chamber 15 and the injector 11 a sealing seat, so that the injection openings 12 are at least indirectly closed, such that the injection of fuel from the high-pressure chamber 15 is avoided in the combustion chamber of the internal combustion engine , In the other, not shown, lifted from the sealing seat position of the nozzle needle 16, this releases the injection openings 12 for injecting the fuel into the combustion chamber of the internal combustion engine. The movement of the nozzle needle 16, in particular for releasing the injection openings 12, takes place in a manner known per se by means of an actuator, not shown, which can be actuated via a voltage supply line 18 by a control device of the internal combustion engine. The actuator may in particular be a magnetic actuator or else a piezoactuator.

Die Versorgung des Hochdruckraums 15 mit unter Hochdruck (Systemdruck) stehendem Kraftstoff erfolgt über eine innerhalb des Injektorgehäuses 11 angeordnete bzw. in Bauteilen des Kraftstoffinjektors 10 ausgebildete Versorgungsbohrung 19, die insbesondere exzentrisch zur Längsachse 21 des Injektorgehäuses 11 in einem Randbereich des Kraftstoffinjektors 10, zumindest im Wesentlichen parallel zur Längsachse 21, verläuft. Die Versorgungsbohrung 19 ist darüber hinaus über einen nicht dargestellten Kraftstoffanschlussstutzen mit einer Kraftstoffleitung 22 verbunden, welche wiederum mit einem Kraftstoffspeicher 25 (Rail) gekoppelt ist.The supply of the high-pressure chamber 15 with fuel under high pressure (system pressure) via a disposed within the injector housing 11 or formed in components of the fuel injector 10 supply bore 19, in particular eccentric to the longitudinal axis 21 of the injector 11 in an edge region of the fuel injector 10, at least Substantially parallel to the longitudinal axis 21, runs. The supply bore 19 is also connected via a fuel connection, not shown, with a fuel line 22, which in turn is coupled to a fuel reservoir 25 (rail).

In einem von den Einspritzöffnungen 12 bzw. dem Brennraum axial relativ weit beabstandeten Bereich des Injektorgehäuses 11 ist in dessen Außenwand 23 beispielhaft eine sacklochförmige Vertiefung 24 ausgebildet, so dass die Wanddicke des Injektorgehäuses 11 im Bereich der Vertiefung 24 reduziert ist. Ergänzend wird erwähnt, dass anstelle einer sacklochförmigen Vertiefung 24 das Injektorgehäuse 11 auch eine Abflachung aufweisen kann, in deren Bereich die Wanddicke des Injektorgehäuses 11 reduziert ist.In one of the injection openings 12 and the combustion chamber axially relatively widely spaced portion of the injector 11 is in the outer wall 23 by way of example a blind hole-shaped recess 24 is formed, so that the wall thickness of the injector 11 is reduced in the region of the recess 24. In addition, it is mentioned that instead of a blind hole-shaped recess 24, the injector housing 11 may also have a flattening, in the region of which the wall thickness of the injector housing 11 is reduced.

Der ebene ausgebildete Grund 26 der Vertiefung 24 bildet einen Teil eines Verformungsbereichs 27 aus. Auf der der Vertiefung 24 abgewandten Seite des Injektorgehäuses 11 ist das Injektorgehäuse 11 beispielhaft in Wirkverbindung mit einem Abzweig 28 angeordnet, der wiederum in der Versorgungsbohrung 19 mündet. Dadurch wirkt der in der Versorgungsbohrung 19 augenblicklich herrschende Kraftstoffdruck auch in dem Injektorgehäuse 11 auf der der Vertiefung 24 abgewandten Seite. Dadurch, dass die Wanddicke des Injektorgehäuses 11 im Bereich der Vertiefung 24 reduziert ist, wirkt der Wandabschnitt 29 des Injektorgehäuses 11 auf der der Vertiefung 24 zugewandten Seite als Verformungsbereich 27 in Art einer elastisch verformbaren Membran, wobei die Verformung, welche sich als Wölbung ausbildet, umso größer ist, je höher der augenblickliche Kraftstoffdruck in der Versorgungsbohrung 19 bzw. dem Abzweig 28 ist.The flat bottom 26 of the recess 24 forms part of a deformation region 27. On the side facing away from the recess 24 of the injector 11, the injector 11 is for example in operative connection arranged with a branch 28, which in turn opens into the supply hole 19. As a result, the fuel pressure currently prevailing in the supply bore 19 also acts in the injector housing 11 on the side facing away from the recess 24. Because the wall thickness of the injector housing 11 is reduced in the region of the recess 24, the wall section 29 of the injector housing 11 acts on the recess 24 facing side as a deformation region 27 in the manner of an elastically deformable membrane, wherein the deformation, which forms as a curvature, the higher the instantaneous fuel pressure in the supply bore 19 or the branch 28 is, the greater.

Zur Detektion des zeitlichen Verlaufs des Kraftstoffdrucks in dem Abzweig 28 bzw. in der Versorgungsbohrung 19 und damit auch in dem Hochdruckraum 15, welcher als Indiz für die augenblickliche Stellung der Düsennadel 16 zur Ansteuerung der Düsennadel 16 verwendet wird, weist der Kraftstoffinjektor 10 eine Messeinrichtung 30 auf. Die Messeinrichtung 30 umfasst ein als Piezoelement 31 ausgebildetes Sensorelement 32.To detect the time course of the fuel pressure in the branch 28 or in the supply bore 19 and thus also in the high-pressure chamber 15, which is used as an indication of the instantaneous position of the nozzle needle 16 for driving the nozzle needle 16, the fuel injector 10 has a measuring device 30 on. The measuring device 30 comprises a sensor element 32 designed as a piezo element 31.

Das Piezoelement 31 ist mit dem Verformungsbereich 27 über eine stoffschlüssige Verbindung in Form einer Klebeverbindung 34 verbunden. Die Klebeverbindung 34 ist über einen Teilbereich der Fläche des Grunds 26 der Vertiefung 24 ausgebildet, derart, dass zwischen der Klebeverbindung 34 und einer die Vertiefung 24 begrenzenden Umfangswand 35 ein radial umlaufender, klebstofffreier Bereich 36 ausgebildet ist. Das insbesondere einen runden Querschnitt aufweisende Piezoelement 31 bzw. die Messeinrichtung 30 ist mittels eines topf- bzw. becherförmig ausgebildeten Gehäuses 40 mit vorzugsweise rundem Querschnitt gegen äußere Umwelteinflüsse geschützt bzw. mediendicht angeordnet. Hierzu weist das Gehäuse 40 auf der dem Grund 26 der Vertiefung 24 zugewandten Seite beispielhaft einen flanschartig umlaufenden Randbereich 41 auf, der mit dem Grund 26 der Vertiefung 24 in dem klebstofffreien Bereich 36 verbunden ist. Besonders bevorzugt zur Verbindung des Gehäuses 40 mit dem Injektorgehäuse 11 bzw. dem Grund 26 der Vertiefung 24 ist die Ausbildung einer Schweißverbindung, insbesondere einer Laserschweißverbindung, derart, dass eine vollständig umlaufende Laserschweißnaht 42 erzeugt wird. Das Ausbilden der Schweißverbindung bzw. der Laserschweißnaht 42 findet erfindungsgemäß in einer inerten Atmosphäre, oder unter Vakuum statt, sodass in dem Innenraum 44 des Gehäuses 40, d.h. insbesondere in dem Bereich zwischen dem Gehäuse 40 und der Klebeverbindung 34 entweder ein inertes Gas, oder aber Vakuum ausgebildet ist.The piezoelectric element 31 is connected to the deformation region 27 via a material connection in the form of an adhesive connection 34. The adhesive bond 34 is formed over a portion of the surface of the bottom 26 of the recess 24, such that a radially encircling, adhesive-free region 36 is formed between the adhesive bond 34 and a peripheral wall 35 delimiting the recess 24. The piezoelectric element 31, in particular having a round cross-section, or the measuring device 30 is protected against external environmental influences by means of a pot-shaped or cup-shaped housing 40 with a preferably round cross-section. For this purpose, the housing 40 on the base 26 of the recess 24 facing side by way of example a flange-like peripheral edge portion 41 which is connected to the bottom 26 of the recess 24 in the adhesive-free region 36. Particularly preferred for connecting the housing 40 to the injector housing 11 or the base 26 of the recess 24 is the formation of a welded connection, in particular a laser welding connection, such that a completely circumferential laser weld seam 42 is produced. The formation of the welded connection or the laser weld seam 42 takes place according to the invention in an inert atmosphere, or under vacuum, so that in the interior 44 of the housing 40, that is, in particular in the region between the housing 40 and the adhesive connection 34 either an inert gas, or vacuum is formed.

Weiterhin weist das insbesondere aus Metall bestehende Gehäuse 40 in einer etwa parallel zur Oberfläche des Sensorelements 32 angeordneten Wand 45 zwei Durchbrüche 46, 47 auf, durch die entweder abgedichtet angeordnete elektrische Anschlussleitungen 48, 49 geführt sind, die mit dem Sensorelement 32 bzw. dem Piezoelement 31 verbunden sind, oder aber zwei Steckerelemente, die auf der dem Piezoelement 31 zugewandten Seite, d.h. innerhalb des Innenraums 45 des Gehäuses 40, mit elastisch ausgebildeten Kontaktelementen 53, 54, beispielsweise in Form von Druckfedern, verbunden sind. Die Kontaktelemente 53, 54 liegen elektrisch leitend an der Oberfläche des Piezoelements 31 auf, und zwar insbesondere im Bereich von dort angeordneten Elektroden des Piezoelements 31 (nicht dargestellt) um die von dem Piezoelement 31 bei einer Verformung erzeugten Spannungen über die Anschlussleitungen 48, 49 einer nicht dargestellten Steuer- bzw. Auswerteeinheit zuzuführen.Furthermore, the housing 40, which consists in particular of metal, has two apertures 46, 47 in a wall 45 arranged approximately parallel to the surface of the sensor element 32, through which either electrically sealed connecting leads 48, 49 are guided, which are connected to the sensor element 32 or the piezo element 31 are connected, or two plug elements, which on the piezoelectric element 31 side facing, ie within the interior space 45 of the housing 40, with elastically formed contact elements 53, 54, for example in the form of compression springs, are connected. The contact elements 53, 54 are electrically conductive on the surface of the piezoelectric element 31, in particular in the region of arranged there electrodes of the piezoelectric element 31 (not shown) to the voltages generated by the piezoelectric element 31 in a deformation via the connecting lines 48, 49 a supply not shown control or evaluation.

Beim Betrieb des Kraftstoffinjektors 10 verformt sich der Verformungsbereich 27 in Abhängigkeit des in der Versorgungsbohrung 19 herrschenden Kraftstoffdrucks elastisch nach außen. Diese Verformung überträgt sich über die Klebeverbindung 34 auf das Piezoelement 31 und erzeugt dort in Abhängigkeit der Verformung bzw. der Zugspannungen elektrische Spannungen, die mittels einer geeigneten Auswerteschaltung dazu verwendet werden können, zumindest mittelbar auf eine Stellung der Düsennadel 16 in dem Injektorgehäuse 11 zu schließen.During operation of the fuel injector 10, the deformation region 27 elastically deforms outward as a function of the fuel pressure prevailing in the supply bore 19. This deformation is transmitted via the adhesive bond 34 to the piezoelectric element 31 and there generates, depending on the deformation or the tensile stresses, electrical voltages which can be used by means of a suitable evaluation circuit to close at least indirectly on a position of the nozzle needle 16 in the injector housing 11 ,

Der soweit beschriebene Kraftstoffinjektor 10 kann in vielfältiger Art und Weise abgewandelt bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen, so kann insbesondere die Form oder der Aufbau des Piezoelements 31 von den dargestellten Ausführungsformen abweichen.The fuel injector 10 described so far can be modified or modified in many ways, without departing from the spirit, so in particular the shape or structure of the piezoelectric element 31 may differ from the illustrated embodiments.

Claims (10)

Kraftstoffinjektor (10), insbesondere Common-Rail-Injektor, mit einem Injektorgehäuse (11), in dem ein Hochdruckraum (15) ausgebildet ist, der über eine im Injektorgehäuse (11) angeordnete Versorgungsbohrung (19) mit unter Druck stehendem Kraftstoff versorgbar ist, mit wenigstens einer zumindest mittelbar mit dem Hochdruckraum (15) verbundenen, im Injektorgehäuse (11) ausgebildeten Einspritzöffnung (12) zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine, mit einem die wenigstens eine Einspritzöffnung (12) freigebenden oder verschließenden Einspritzglied (16), und mit einer Messeinrichtung (30) zur zumindest mittelbaren Erfassung des Drucks im Hochdruckraum (15) oder der Versorgungsbohrung (19), wobei die Messeinrichtung (30) dazu ausgebildet ist, eine elastische Verformung eines zumindest mittelbar mit der Versorgungsbohrung (19) oder dem Hochdruckraum (15) in Wirkverbindung angeordneten Verformungsbereichs (27) zu erfassen, und wobei die Messeinrichtung (30) ein Sensorelement (32) aufweist, das mit der Oberfläche des Verformungsbereichs (27) über eine Klebeverbindung (34) verbunden ist,
dadurch gekennzeichnet,
dass zumindest der Bereich der Klebeverbindung (34) zwischen dem Verformungsbereich (27) und dem Sensorelement (32) von einem Gehäuseelement (40) umschlossen ist, das zumindest den Bereich der Klebeverbindung (34) gegenüber der äußeren Umgebung mediendicht abdichtet.Fuel injector (10), in particular common-rail injector, with an injector housing (11) in which a high-pressure chamber (15) is formed, which can be supplied with pressurized fuel via a supply bore (19) arranged in the injector housing (11), with at least one injection opening (12) formed in the injector housing (11) and at least indirectly connected to the high-pressure chamber (15) for injecting fuel into the combustion chamber of an internal combustion engine, with an injection member (16) releasing or closing the at least one injection opening (12), and with a measuring device (30) for at least indirect detection of the pressure in the high-pressure chamber (15) or the supply bore (19), wherein the measuring device (30) is adapted to an elastic deformation of at least indirectly with the supply bore (19) or the high-pressure chamber (15) in operative connection arranged deformation region (27) to detect, and wherein the measuring device (3 0) has a sensor element (32) which is connected to the surface of the deformation region (27) via an adhesive connection (34),
characterized,
in that at least the region of the adhesive bond (34) between the deformation region (27) and the sensor element (32) is enclosed by a housing element (40) which seals at least the area of the adhesive bond (34) against the external environment in a media-tight manner. Kraftstoffinjektor nach Anspruch 1,
dadurch gekennzeichnet,
dass das Gehäuseelement (40) in dem Bereich zwischen dem Gehäuseelement (40) und der Klebeverbindung (34) mit einem inerten Gas gefüllt ist.Fuel injector according to claim 1,
characterized,
in that the housing element (40) is filled with an inert gas in the area between the housing element (40) and the adhesive connection (34). Kraftstoffinjektor nach Anspruch 1,
dadurch gekennzeichnet,
dass das Gehäuseelement (40) in dem Bereich zwischen dem Gehäuseelement (40) und der Klebeverbindung (34) evakuiert ist.Fuel injector according to claim 1,
characterized,
in that the housing element (40) is evacuated in the area between the housing element (40) and the adhesive connection (34). Kraftstoffinjektor nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
dass das Gehäuseelement (40) becherförmig ausgebildet ist und die Messeinrichtung (30) vollständig, mit Ausnahme des Bereichs des Verformungsbereichs (27), umgibt.Fuel injector according to one of claims 1 to 3,
characterized,
in that the housing element (40) is cup-shaped and surrounds the measuring device (30) completely, with the exception of the region of the deformation region (27). Kraftstoffinjektor nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
dass das Gehäuseelement (40) einen flanschartig umlaufenden Bereich (41) aufweist, der mittels einer Schweiß- oder Klebeverbindung, vorzugsweise mittels einer Laserschweißnaht (42), mit dem Injektorgehäuse (11) dicht verbunden ist.Fuel injector according to one of claims 1 to 4,
characterized,
that the housing element (40) has a flange-like peripheral region (41) which is tightly connected by means of a welded or adhesive connection, preferably by means of a laser weld seam (42) to the injector (11). Kraftstoffinjektor nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
dass in einer Wand (45) des Gehäuseelements (40) wenigstens ein Durchbruch (46, 47) zur Durchführung einer elektrischen Kontaktierung des Sensorelements (32) ausgebildet ist, und dass der Bereich des wenigstens einen Durchbruchs (46, 47) abgedichtet ausgebildet ist.Fuel injector according to one of claims 1 to 5,
characterized,
in that in a wall (45) of the housing element (40) at least one opening (46, 47) for carrying out electrical contacting of the sensor element (32) is formed, and in that the area of the at least one opening (46, 47) is sealed. Kraftstoffinjektor nach Anspruch 6,
dadurch gekennzeichnet,
dass innerhalb des Gehäuses (40) wenigstens ein der elektrischen Kontaktierung des Sensorelements (32) dienendes, elastisch angeordnetes Kontaktelement (53, 54) vorgesehen ist, das in elektrischer Wirkverbindung mit dem Sensorelement (32), insbesondere mit der der Klebeverbindung (34) gegenüberliegenden Seite des Sensorelements (32), verbunden ist.Fuel injector according to claim 6,
characterized,
in that at least one elastically arranged contact element (53, 54) serving to make electrical contact with the sensor element (32) is provided inside the housing (40), which is in electrical operative connection with the sensor element (32), in particular with that of the adhesive connection (34) Side of the sensor element (32) is connected. Kraftstoffinjektor nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
dass das Sensorelement (32) als Piezoelement (31) ausgebildet ist.Fuel injector according to one of claims 1 to 7,
characterized,
that the sensor element (32) is designed as a piezo element (31). Kraftstoffinjektor nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
dass der Verformungsbereich (27) im Bereich einer sacklochförmigen Vertiefung (24) oder einer Abflachung des Injektorgehäuses (11) angeordnet ist.Fuel injector according to one of claims 1 to 8,
characterized,
that the deformation region (27) in the region of a blind hole-shaped recess (24) or a flattening of the injector (11) is arranged. Kraftstoffinjektor nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
dass der Verformungsbereich (27) im Bereich der Versorgungsbohrung (19) oder eines mit der Versorgungsbohrung (19) in Wirkverbindung angeordneten Abzweigs (28) angeordnet ist.Fuel injector according to one of claims 1 to 9,
characterized,
that the deformation region (27) in the region of the supply bore (19) or with the supply bore (19) in operative connection arranged feeder (28) is arranged.
EP15190155.0A 2014-11-20 2015-10-16 Fuel injector Active EP3026253B1 (en)

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DE102014223661.4A DE102014223661A1 (en) 2014-11-20 2014-11-20 fuel injector

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EP3026253A1 true EP3026253A1 (en) 2016-06-01
EP3026253B1 EP3026253B1 (en) 2018-04-11

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EP15190155.0A Active EP3026253B1 (en) 2014-11-20 2015-10-16 Fuel injector

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DE (1) DE102014223661A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000983A1 (en) * 2008-02-19 2009-09-24 DENSO CORPORATION, Kariya-shi Fuel injector with built-in pressure sensor
US20100252001A1 (en) * 2009-04-03 2010-10-07 Denso Corporation Fuel injector with fuel pressure sensor and electrical interconnection method of the same
DE102012102634A1 (en) * 2011-04-01 2012-10-04 Denso Corporation Electronic device for fuel injector used in diesel internal combustion engine, has pin that is fixed to housing, is arranging penetrating lead frame and is in contact with cover
DE102012102386A1 (en) * 2011-04-01 2012-10-04 Denso Corporation Sensor device integrated in an internal combustion engine injector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014209330A1 (en) 2014-05-16 2015-11-19 Robert Bosch Gmbh Device for detecting the fuel pressure for a fuel injector, fuel injector and fuel supply line to a fuel injector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000983A1 (en) * 2008-02-19 2009-09-24 DENSO CORPORATION, Kariya-shi Fuel injector with built-in pressure sensor
US20100252001A1 (en) * 2009-04-03 2010-10-07 Denso Corporation Fuel injector with fuel pressure sensor and electrical interconnection method of the same
DE102012102634A1 (en) * 2011-04-01 2012-10-04 Denso Corporation Electronic device for fuel injector used in diesel internal combustion engine, has pin that is fixed to housing, is arranging penetrating lead frame and is in contact with cover
DE102012102386A1 (en) * 2011-04-01 2012-10-04 Denso Corporation Sensor device integrated in an internal combustion engine injector

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EP3026253B1 (en) 2018-04-11

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