EP3159533B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3159533B1
EP3159533B1 EP16188282.4A EP16188282A EP3159533B1 EP 3159533 B1 EP3159533 B1 EP 3159533B1 EP 16188282 A EP16188282 A EP 16188282A EP 3159533 B1 EP3159533 B1 EP 3159533B1
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EP
European Patent Office
Prior art keywords
housing
sensor element
contact
fuel injector
contact elements
Prior art date
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Active
Application number
EP16188282.4A
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German (de)
English (en)
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EP3159533A1 (fr
Inventor
Peter Cromme
Roland Berner
Dieter Junger
Klaus Kreller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3159533A1 publication Critical patent/EP3159533A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/242—Displacement 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
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/247—Pressure sensors

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 2015 211186 A1 the applicant known.
  • the known fuel injector has a sensor element in the form of a piezoelectric element, which is arranged within a hood-shaped housing, wherein the housing presses the piezoelectric element under axial bias against a deformation region of the injector.
  • the piezoelectric element is provided both at the voltage applied to the deformation region and at the voltage applied to the inside of the housing side, each with an insulating layer which completely covers the piezoelectric element.
  • two blind holes are formed in the piezoelectric element on the side facing away from the deformation region, which extend to the respective electrode layer.
  • the contacting of the electrode layers via two contact elements which are arranged in overlap with the piezoelectric element and penetrate the housing bottom.
  • the contact elements are electrically conductively connected to the respective electrode layer via solder joints arranged in the region of the electrode layers.
  • the housing In order to design a measuring device which is as compact as possible, comprising the piezoelectric element and the housing, it is desirable for the housing to surround the piezoelement at the circumference of the piezoelectric element with the smallest possible gap. In addition, it is important that no mechanical stress peaks occur during the Axialkraftbeetzstoffung of the piezoelectric element through the housing, due to bumps or the like. arise on the housing and / or the piezoelectric element or the insulating layer.
  • This housing consists of a housing bottom, a frame-like housing element fastened on the housing bottom, and a cover element which cooperates with the frame-like housing element and which is arranged displaceably or displaceably axially relative to the frame-like housing element.
  • the cover-shaped housing element is moved in the direction of the frame-shaped housing element until the desired preload force is generated.
  • the piezoelectric element is supported on the housing bottom on the side facing away from the cover-shaped housing element.
  • the electrical contacting of the electrode layers of the piezoelectric element via two, the cover-shaped housing member penetrating, provided with spring portions contact elements, which bear electrically conductive on side surfaces of the piezoelectric element.
  • EP 2918819 A1 discloses a fuel injector with a sensor for at least indirectly detecting a pressure in a bore leading the fuel in the injector housing, wherein the sensor is arranged on a component in which the bore is formed.
  • the clamping device serves to generate a bias voltage to the piezoelectric element.
  • the clamping device is designed in the form of a biasing plate, which is connected by means of at least two clamping screws with arms of the support piece 62. By means of a corresponding screw-in depth of the clamping screws in threaded bores of the carrier piece, the preload force acting on the piezo element can be adjusted continuously.
  • the invention has the object, a fuel injector, in particular a common rail injector, according to the preamble of claim 1 in such a way that a minimization of the housing base for receiving the piezoelectric element as simple and accurate housing production is possible, in such a way a planar surface can be produced on the side of the housing facing the piezoelectric element.
  • a simplified electrical contacting of the electrode layers of the piezoelectric element via the contact elements is to be made possible.
  • the invention is based on the idea to form the housing of at least two elements, wherein the one element is designed as a cover element or as a housing cover, which is in preferably planar contact with the sensor element and on the side facing the sensor element a flat Surface having, and wherein in the cover element, the contact elements are arranged, which contact the sensor element at least indirectly electrically.
  • the surface of the lid member By providing a cover element having on the side facing the sensor element, in particular a generally planar surface (without protruding from the surface side walls or the like), it is possible with relatively little effort, the surface of the lid member by grinding o.ä , To provide machining method over its entire surface with the appropriate accuracy or low roughness, so that in the assembled state of the measuring device, the lid member with its sensor element facing surface abuts the piezoelectric element or its insulating layer that no mechanical stress peaks in the transmission of an axial force the sensor element are generated.
  • the housing cover cooperates with a sleeve-shaped element of the housing on the deformation region of the injector facing away from the side facing a radially inwardly projecting holding portion, against which the housing cover on the deformation region facing side of the holding portion abuts axially.
  • the holding portion thus causes a depression of the housing cover in the direction of the sensor element. Furthermore, it allows such a trained Holding portion, when it is arranged over the entire circumference of the sleeve-shaped element, to seal the interior of the housing.
  • the sensor element is designed as a piezoelectric element with a rectangular base area and with at least one piezoceramic layer and two electrode layers and with insulating layers, and that two contact elements are provided, which are arranged in the region of preferably diagonally opposite corner regions of the piezoelectric element in the housing cover and flush with the surface of the housing cover facing the sensor element ,
  • Such an arrangement makes it possible to machine the housing cover on the side facing the sensor element together with the contact elements already arranged therein, which are usually connected to the cover element via a glass melting process, in order to form the desired planar surface.
  • the housing cover is connected to the sleeve-shaped element (housing frame) by means of a weld seam.
  • the contact elements are electrically connected with the interposition of a conductive adhesive or a solder with the metallizations.
  • the respective electrode layer in particular by a metallization, preferably up to the level of the lid member facing the end face of the To lead piezoelectric element or its insulating layer. The electrical contact between the metallization and the respective contact element then takes place through the conductive adhesive or the solder.
  • the contact elements are arranged in at least partial coverage with the sensor element, and that the sensor element on the contact elements facing side at least in the covering area with the contact elements a recess for the conductive adhesive or the solder has.
  • Such an embodiment allows a minimization of the required cover and thus the housing size.
  • the contact elements are arranged in complete overlap with the sensor element, and that the sensor element for each contact element in alignment with the contact element has a recess in Has a shape of a blind hole, which extends to the respective electrode layer, and which is filled with solder for electrical connection between the electrode layer and the contact element.
  • the electrical contacting of the electrode layers of the piezoelectric element does not necessarily have to take place via a conductive adhesive or a solder layer.
  • the contact elements are connected by means of an intermediate element in each case with the metallization or the electrode layer.
  • the intermediate element may be formed, for example, as a spring element which is connected to the sensor element and rests with a spring portion against the respective contact element.
  • the spring element is connected to the piezoelectric element and the spring portion inevitably gets into electrically conductive contact with the contact element during assembly. For reasons of process reliability, such a procedure may possibly have advantages in comparison to an electrical contacting by means of a solder or a conductive adhesive.
  • the intermediate elements are received positively and non-positively in a particular annular support member. This makes it possible to dispense with cohesive connections or a particularly simple and reliable installation.
  • a spring element instead of a spring element, however, it may also be provided to form the intermediate element in the form of a connecting wire, in particular a bonding wire.
  • the contact elements are arranged out of alignment with the sensor element. This allows easier contacting of the contact elements within the housing.
  • 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 injector housing 11, which consists essentially of metal and may have a multi-part design, in which at least one, preferably several injection openings 12 for injecting the fuel are arranged on the side facing the combustion chamber of the internal combustion engine.
  • 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.
  • a nozzle needle 16 serving as an injection member is arranged in a liftable manner in the direction of the double arrow 17.
  • this forms 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 no injection of fuel from the high-pressure chamber 15 in the Combustion chamber of the internal combustion engine sattfindet.
  • the nozzle needle 16 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.
  • 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 newly formed base 26 of the recess 24 forms part of a deformation region 27.
  • 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. Since the wall thickness of the injector housing 11 is reduced in the region of the recess 24, the wall portion 29 of the injector 11 acts on the side facing the recess 24 as a deformation region 27 in the form of an elastically deformable membrane, the greater the deformation, which forms as a curvature is, the higher the instantaneous fuel pressure in the supply bore 19.
  • the fuel injector 10 For detecting the time profile of the fuel pressure 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.
  • the measuring device 30 comprises a sensor element 32 designed as a piezo element 31.
  • the sensor element 32 which is substantially block-shaped with a rectangular base area (FIG. Fig. 3 ) is formed, in addition to a piezoceramic layer 34 at its top and its bottom in each case an electrode layer 35, 36.
  • the electrode layers 35, 36 are formed on opposite sides up to a respective side surface 37, 38 and end on the respective opposite side surface 38, 37 in front of the respective other side surface 38, 37th
  • this may not only have one but a plurality of piezoceramic layers 34 arranged parallel to one another, which are each separated from one another by electrode layers 35, 36.
  • the electrode layers 35, 36 are in turn formed mutually extended with up to one of the side surfaces 37, 38 and terminate on the other side in front of the corresponding side surface 38, 37th
  • the two electrode layers 35, 36 on the side facing away from each of the piezoceramic layer 34 are covered with an electrical insulation layer 41, 42.
  • the side surfaces 37, 38 are each equipped with a metallization 39, 40, which is formed for example by dipping.
  • the metallization 39, 40 extends after the formation of the same initially over the entire height of the side surfaces 37, 38 and is then provided by a machining with bevels 43 in the region of the side edges on the opposite end faces of the insulating layers 39, 40, so that the metallization 39, 40 before the respective end face of the insulating layer 41, 42 ends.
  • the newly formed contact surfaces 44, 45 which are also arranged parallel to each other, in particular by a mechanical machining process, such as grinding, surface-finished and equipped with a relatively low roughness.
  • the formation of the contact surfaces 44, 45 by double-plan loops. While one (lower) contact surface 45 rests directly on the base 26 of the deformation region 27 of the injector housing 11, the other (upper) contact surface 44 is arranged in operative connection with a housing cover 47.
  • the housing cover 47 is part of a housing 50, which comprises at least one substantially sleeve-shaped housing frame 48 in addition to the housing cover 47.
  • the particular metal housing frame 48 is connected in a manner not shown, in particular by a laser weld, with the bottom 26 of the injector 11 tightly connected.
  • the housing frame 48 which completely surrounds the sensor element 32 at its circumference, has a side facing away from the injector housing 11 and the base 26, respectively flange-like radially inwardly projecting holding portion 51, on the underside of the housing cover 47 is flush with the top thereof.
  • the two contact elements 52, 53 are, for example, each with a in the Fig. 1 schematically shown connecting line 54, 55, which in turn are contacted with a control or evaluation device, not shown.
  • the contact elements 52, 53 are, as in particular with reference to the Fig. 3 can be seen, arranged near diagonally opposite corner regions 57, 58 of the sensor element 32. They are arranged inside the housing cover 47 in a glass remelting 59 or electrically insulated from the housing cover 47 which is also in particular likewise made of metal. While the contact elements 52, 53 protrude axially, for example, over the upper side of the housing cover 47, they are flush with the underside 61 of the housing cover 47 facing the contact surface 44 of the insulating layer 41.
  • the in the Fig. 4 and 5 illustrated measuring device 30a differs from the measuring device 30 according to the Fig. 2 and 3 in that, during its production process, the sensor element 32a has been machined on the upper side facing the housing cover 47 in the region of the (upper) insulation layer 41, in that the areas of the insulation layer 41 arranged in overlap with the contact elements 52, 53 have been partially removed.
  • the metallizations 39, 40 as based on the Fig. 5 it can be seen to provide a region-wise increased thickness in the region of the insulation layer 41.
  • the metallizations 39, 40 are then in turn partially removed by a mechanical processing, not shown, such that, corresponding to the Fig.
  • an at least approximately uniform thickness of the metallization 39, 40 in the region of the top of the insulating layer 41, 42 is formed.
  • Such a configuration of the electrode layer 35, 36 causes between the metallization 39, 40 on the upper side facing the housing cover 47, a gap 65 is formed, which can be filled with the electrically conductive adhesive 63 and the solder 64.
  • the in the Fig. 6 and 7 illustrated measuring device 30b with the sensor element 32b is characterized in that the electrical contacting of the electrode layer 35, 36 with the respective contact element 52, 53 by means of an electrically conductive intermediate element 66, 67 takes place.
  • the intermediate element 66, 67 is designed in the form of a spring element which has a first contact region 68, which is flat, and which is connected to the respective electrode layer 35, 36 via the metallization 39, 40, for example by means of a solder connection, not shown.
  • the intermediate element 66, 67 in each case has a spring section 69 with a second abutment region 71 which, in the assembled state of the housing cover 47, bears against the respective contact element 52, 53 under mechanical prestressing.
  • the electrical contacting of the contact element 52, 53 with the intermediate element 67, 68 additionally by means of a soldering or a welded connection.
  • the measuring device 30c has a sensor element 32c, in which the base 26 of the deformation region 27 facing (lower) insulating layer 42 is partially removed at two diagonally opposite corner regions. In these corner regions, the metallization 39, 40 is guided around by the side surfaces 37, 38. Between the recessed surface areas and a bridging element 73, a gap 74 is formed, in the region of which the respective metallization 39, 40 is contacted with a bonding wire 75, 76.
  • the connection can be made for example by means of an adhesive 63 or a solder 64, or by means of other suitable connection technologies, for example by means of ultrasonic bonding or the like.
  • the bonding wire 75, 76 can be guided in a simple manner in the form of an arc against the underside 61 of the housing cover 47 in the region of the contact elements 52, 53 where the bonding wires 75, 76 are connected to the contact elements 52, 53.
  • the contact elements 52, 53 are arranged completely within the overlap region with the sensor element 32d.
  • the sensor element 32d has in the region of diagonally opposite corner regions 57, 58 in each case a blind hole-shaped recess 78, 79, which is formed up to the level of the respective electrode layer 35, 36.
  • This recess 78, 79 is completely filled in particular with a solder 64 in order to electrically connect the electrode layer 35, 36 with the contact element 52, 53.
  • the electrode layer 35 does not protrude up to the Recess 78 zoom.
  • the contact element 52, 53 has a centrally formed passage opening 81, through which the solder 64 can be metered.
  • the gap 65 between the sensor element 32d and the housing frame 48 is minimized.
  • the sensor element 32d rests with the interposition of a bridging element 82 at the base 26 of the deformation region 27.
  • the in the Fig. 13 illustrated measuring device 30e is based essentially on the measuring device 30c according to the Fig. 8 ,
  • the contact elements 52, 53 are each connected by means of a connecting element, for example in the form of a bonding wire 75e, 76e, to the associated metallization 39, 40 of the sensor element 32e by soldering or bonding.
  • the sections 83, 84 of the bonding wires 75e, 76e connected to the contact element 52, 53 and the metallization 39, 40 in the region of the contact areas 68e, 71e are parallel to one another and perpendicular to the plane of the drawing Fig.
  • the in the Fig. 14 and 15 illustrated measuring device 30f has intermediate elements 66f, 67f in the form of spring elements similar to the measuring device 30b.
  • the contact areas 68f, 71f are preferably only under mechanical pretension, ie without the formation of a cohesive connection, against the contact elements 52, 53 or the metallizations 39, 40.
  • mechanical preloading force of the intermediate elements 66f, 67f and the positioning of the intermediate elements 66f, 67f these are received in regions within a support ring 90.
  • the support ring 90 has in the region of the intermediate elements 66f, 67f slot-like recesses 91, 92, in which of the intermediate elements 66f, 67f transversely projecting tabs 93, 94 are arranged positively and non-positively. Thereby a fixation of the intermediate elements 66f, 67f in the support ring 90 is effected.
  • the support ring 90 lies with a first end face partially on the underside of the contact elements 52, 53 and with a second end face on the bridging element 72f. Furthermore, the support ring 90 surrounds the sensor element 32 f with a small radial distance and is accommodated in the sleeve-shaped housing frame 48 with a small radial distance.
  • the mode of operation of the sensor elements 32, 32a to 32f is that upon an (elastic) deformation of the deformation region 27 as a result of a pressure change in the supply bore 19 by the respective sensor element 32, 32a to 32f, an electrical voltage signal is generated which is transmitted via the contact elements 52, 53 is transmitted to an evaluation or measurement device, not shown. Due to the voltage signal, it is at least indirectly possible to deduce a position of the nozzle needle 16 in the injector housing 11, this signal serving to actuate the nozzle needle 16.

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

Claims (12)

  1. Injecteur de carburant (10), en particulier injecteur à rampe commune, comprenant un boîtier d'injecteur (11) dans lequel est réalisé un espace haute pression (15) qui peut être alimenté en carburant sous pression par le biais d'un alésage d'alimentation (19) disposé dans le boîtier d'injecteur (11), comprenant un dispositif de mesure (30 ; 30a à 30d) pour détecter au moins de manière indirecte la pression dans l'espace haute pression (15) ou dans l'alésage d'alimentation (19), le dispositif de mesure (30 ; 30a à 30f) étant réalisé de manière à détecter une déformation élastique d'une région de déformation (27) du boîtier d'injecteur (11) disposée au moins indirectement en liaison fonctionnelle avec l'alésage alimentation (19) ou avec l'espace haute pression (15), le dispositif de mesure (30 ; 30a à 30f) présentant un élément de capteur (32 ; 32a à 32f) qui est disposé en contact d'appui avec la surface de la région de déformation (27), l'élément de capteur (32 ; 32a à 32f) étant mis en contact électrique par le biais d'éléments de contact (52, 53), le dispositif de mesure (30 ; 30a à 30f) étant reçu en partie dans un boîtier (50) connecté au boîtier d'injecteur (11), qui entoure l'élément de capteur (32 ; 32a à 32f) sur sa périphérie et qui le recouvre sur le côté opposé à la région de déformation (27), et le boîtier (50) étant disposé du côté opposé à la région de déformation (27) en contact d'appui avec l'élément de capteur (32 ; 32a à 32f) et sollicitant par force l'élément de capteur (32 ; 32a à 32f) avec une force de précontrainte axiale (F) contre la région de déformation (27), le boîtier (50) se composant d'au moins deux éléments, l'un des éléments étant réalisé sous forme de couvercle de boîtier (47) qui est disposé en contact d'appui de préférence plat avec l'élément de capteur (32 ; 32a à 32f) et qui présente une surface plane (61) du côté tourné vers l'élément de capteur (32 ; 32a à 32f), et que dans le couvercle de boîtier (47) sont disposés les éléments de contact (52, 53), qui viennent en contact électrique au moins indirectement avec l'élément de capteur (32 ; 32a à 32f), et le couvercle de boîtier (47) coopérant avec un élément en forme de douille (48) du boîtier (50) qui présente, du côté opposé à la région de déformation (27), une portion de retenue (51) faisant saillie radialement vers l'intérieur, contre laquelle s'applique axialement le couvercle de boîtier (47) du côté de la portion de retenue (51) tourné vers la région de déformation (27),
    caractérisé en ce que
    l'élément de capteur (32 ; 32a à 32F) est réalisé sous forme d'élément piézoélectrique (31) avec une surface de base rectangulaire et avec au moins une couche en piézocéramique (34) et au moins deux couches d'électrodes (35, 36) ainsi qu'avec des couches d'isolation (41, 42), et en ce que deux éléments de contact (52, 53) sont prévus, lesquels sont disposés dans le couvercle de boîtier (47) dans la région de zones de coin (57, 58), de préférence diagonalement opposées, de l'élément de capteur (32 ; 32a à 32f) et qui s'étendent en affleurement superficiel avec la surface (61) du couvercle de boîtier (47) du côté tourné vers l'élément de capteur (32 ; 32a à 32f).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le couvercle de boîtier (47) coopère avec un élément en forme de douille (48) du boîtier (50), et en ce que le couvercle de boîtier (47) est connecté à l'élément en forme de douille (48) au moyen d'un cordon de soudure (96).
  3. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    les éléments de contact (52, 53) sont connectés, en interposant une colle (63) électriquement conductrice ou une brasure (64), à des métallisations (39, 40) qui sont à leur tour connectées de manière électriquement conductrice aux couches d'électrodes (35, 36).
  4. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    les éléments de contact (52, 53) sont disposés de manière à recouvrir au moins partiellement l'élément de capteur (32a), et en ce que l'élément de capteur (32a) présente, du côté tourné vers les éléments de contact (52, 53), au moins dans la région recouverte par les éléments de contact (52, 53), un évidement (65) pour la colle (63) ou la brasure (64).
  5. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    les éléments de contact (52, 53) sont disposés de manière à recouvrir complètement l'élément de capteur (32d) et en ce que l'élément de capteur (32d) présente, pour chaque élément de contact (52, 53), un évidement (78, 79) en alignement avec l'élément de contact (52, 53), qui s'étend jusqu'à la couche d'électrodes respective (35, 36), et qui est rempli de brasure (64) pour la connexion électrique entre la couche d'électrodes (52, 53) et l'élément de contact (52, 53).
  6. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    les éléments de contact (52, 53) sont connectés à chaque fois au moyen d'un élément intermédiaire (66 ; 66f, 67 ; 67f, 75 ; 75e, 76 ; 76e) au moins de manière indirecte à la couche d'électrodes (35, 36) .
  7. Injecteur de carburant selon la revendication 6,
    caractérisé en ce que
    l'élément intermédiaire (66 ; 66f, 67 ; 67f) réalisé sous forme d'élément de ressort qui est connecté à l'élément de capteur (32b ; 32f) et qui s'applique avec une portion de ressort (69) contre l'élément de contact respectif (52, 53).
  8. Injecteur de carburant selon la revendication 7,
    caractérisé en ce que
    l'élément intermédiaire (66f, 67f) s'applique avec précontrainte mécanique contre une métallisation (39, 40) de l'élément de capteur (32f) connectée à la couche d'électrodes (35, 36).
  9. Injecteur de carburant selon la revendication 7 ou 8,
    caractérisé en ce que
    l'élément intermédiaire (66f, 67f) est reçu par engagement par correspondance de formes et par force dans un élément de support (90) notamment de forme annulaire.
  10. Injecteur de carburant selon la revendication 9,
    caractérisé en ce que
    l'élément de support (90) est disposé entre les éléments de contact (52, 53) et un élément de pontage (72f).
  11. Injecteur de carburant selon l'une quelconque des revendications 6 à 10,
    caractérisé en ce que
    l'élément intermédiaire (75; 75e, 76 ; 76e) est réalisé sous forme de fil de connexion, en particulier sous forme de fil de liaison.
  12. Injecteur de carburant selon l'une quelconque des revendications 6 à 11,
    caractérisé en ce que
    les éléments de contact (52, 53) sont disposés hors d'alignement avec l'élément de capteur (32b ; 32c) .
EP16188282.4A 2015-10-20 2016-09-12 Injecteur de carburant Active EP3159533B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015220394.8A DE102015220394A1 (de) 2015-10-20 2015-10-20 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP3159533A1 EP3159533A1 (fr) 2017-04-26
EP3159533B1 true EP3159533B1 (fr) 2018-06-13

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EP16188282.4A Active EP3159533B1 (fr) 2015-10-20 2016-09-12 Injecteur de carburant

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EP (1) EP3159533B1 (fr)
DE (1) DE102015220394A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014204629A1 (de) * 2014-03-13 2015-09-17 Robert Bosch Gmbh Kraftstoffinjektor, insbesondere Common-Rail-Injektor
DE102014204746A1 (de) * 2014-03-14 2015-09-17 Robert Bosch Gmbh Kraftstoffinjektor, insbesondere Common-Rail-Injektor
DE102015206029A1 (de) * 2015-04-02 2016-10-06 Robert Bosch Gmbh Kraftstoffinjektor
EP3088729B1 (fr) * 2015-04-30 2018-07-04 Robert Bosch Gmbh Injecteur de carburant et dispositif et procede de montage d'un dispositif de mesure
DE102015211186A1 (de) 2015-04-30 2016-11-03 Robert Bosch Gmbh Kraftstoffinjektor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP3159533A1 (fr) 2017-04-26
DE102015220394A1 (de) 2017-04-20

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