WO2008062144A2 - Assembly device for an electromagnetic actuator for an injector on an internal combustion engine - Google Patents

Assembly device for an electromagnetic actuator for an injector on an internal combustion engine Download PDF

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Publication number
WO2008062144A2
WO2008062144A2 PCT/FR2007/052388 FR2007052388W WO2008062144A2 WO 2008062144 A2 WO2008062144 A2 WO 2008062144A2 FR 2007052388 W FR2007052388 W FR 2007052388W WO 2008062144 A2 WO2008062144 A2 WO 2008062144A2
Authority
WO
WIPO (PCT)
Prior art keywords
cover
tubular body
injector
assembly device
seal
Prior art date
Application number
PCT/FR2007/052388
Other languages
French (fr)
Other versions
WO2008062144A3 (en
Inventor
Edward Bolton
Philippe Boyer
Denis Pascal
Original Assignee
Electricfil Automotive
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electricfil Automotive filed Critical Electricfil Automotive
Publication of WO2008062144A2 publication Critical patent/WO2008062144A2/en
Publication of WO2008062144A3 publication Critical patent/WO2008062144A3/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
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly

Definitions

  • the subject of the invention relates to an electromagnetic injector for an internal combustion engine.
  • the object of the invention relates more specifically to the mounting system of an electromagnetic actuator forming part of an injector for an internal combustion engine.
  • an injector for an internal combustion engine comprises a tubular body provided at one of its ends with a fuel injection nozzle whose opening is controlled by a valve control system comprising an actuator electromagnetic acting on the valve.
  • the electromagnetic actuator is fixed by a nut on the end of the tubular body of the injector located opposite to that provided with the injection nozzle.
  • the electromagnetic actuator which is provided with electrical connection pins is also traversed by a fuel return tube.
  • Various seals are mounted to ensure a seal on the one hand, between the electrical circuit and the fuel circulation circuit and on the other hand, between the electromagnetic actuator and the tubular body of the injector.
  • many solutions have been proposed to ensure such a durable seal over time, even under severe conditions of mechanical stress.
  • technical solutions that are satisfactory in practice are relatively expensive and complex to achieve. This is particularly the case of the solution recommended by the patent
  • EP 0 483 768 which describes an electromagnetic injector whose magnetic core of the electromagnet is mounted inside a bushing having a shoulder in the form of a ring bearing on a flange of a cap traversed by a pin of electrical connection surrounded by a seal.
  • This solution independently of sealing problems, has a complex and relatively expensive manufacturing.
  • the object of the invention is therefore to overcome the drawbacks of the state of the art by proposing a simple and inexpensive assembly device to ensure a seal for an electromagnetic actuator of an injector for an internal combustion engine.
  • the sealed assembly device for an electromagnetic actuator of an injector for an internal combustion engine comprises a nut for fastening to a tubular body of the injector of the electromagnetic actuator traversed by a fuel return tube and equipped with two electrical connection pins.
  • the assembly device comprises a metal cap to cap the electromagnetic actuator substantially in the extension of the tubular body, and through which the pins and the tube projecting out of the hood, the cap being made in one piece. and having a bearing surface for the nut so that its tightening on the tubular body squeezes, by the bonnet, seals arranged at least around the pins between the bonnet and the actuator in order to obtain a tight fitting.
  • the metal cap is a stamped sheet.
  • a seal is arranged around the fuel return tube between the cover and the electromagnetic actuator, so that when tightening the fixing nut, the seal is compressed.
  • the seals have a biconical shape.
  • the seals form a single piece.
  • the metal cap has localized conformations each delimiting a housing for at least a portion of a seal.
  • the fuel return tube is sealingly attached to the metal cap.
  • the cover is sealingly mounted on the tubular body by means of a seal interposed between the cover and the tubular body.
  • the cover is mounted on a mounting sleeve in the tubular body of the injector.
  • the cover is mounted on the mounting sleeve by a material discharge operation of the cover.
  • the seal is interposed between the mounting sleeve and the cover.
  • the seal is interposed between the mounting sleeve and the tubular body.
  • the cover is provided with recessed and / or protruding conformations for fastening an overmolding coating.
  • Another object of the invention is to provide an injector for an internal combustion engine comprising an assembly device for an electromagnetic actuator according to the invention.
  • Figure 1 is an external perspective view of an embodiment of an injector for an internal combustion engine.
  • Figure 2 is a partial elevational sectional view showing a first embodiment of an injector assembly device according to the invention.
  • Figure 3 is an external perspective view showing the assembly device shown in FIG. 2.
  • Figure 4 is an elevational sectional view showing another embodiment of an assembly device for an injector according to the invention.
  • Figs. 1 to 3 illustrate a first embodiment of an injector 1 for an internal combustion engine.
  • This type of injector is for example of the common rail type.
  • Such an electromagnetic injector 1 comprises a tubular body 2 forming the outer casing of the injector.
  • the injector 1 is provided at one of its ends with an injection nozzle 4 for the fuel.
  • An electromagnetic actuator 6 is mounted using an assembly system 7 according to the invention, on the end of the tubular body 2 opposite to that provided with the injection nozzle 4.
  • the electromagnetic actuator 6 acts on a valve of a system 8 for controlling the opening and closing of the injection nozzle 4.
  • This control system 8 is not described more precisely because it is well known to those skilled in the art and is not part of the subject of the invention.
  • the actuator 6 which is not part of the subject of the invention will be described solely for the purpose of describing the subject of the invention.
  • the electromagnetic actuator 6 comprises a cylindrical body 11 in which is embedded a winding 12 connected to two electrical connection pins 13 protruding from the cylindrical body 11.
  • the cylindrical body 11 is traversed at its center by a tube 14 return of the fuel also protruding from the cylindrical body 11.
  • the connecting pins 13 thus extend projecting from either side of the tube 14.
  • the assembly system 7 comprises a cap or a metal cap 16 to cap the actuator electromagnetic 6 substantially in the extension of the tubular body 2.
  • the metal cover 16 and has a skirt 17 of circular section surrounding the electromagnetic actuator 6 over at least a portion of its height.
  • the skirt 17 extends substantially to the square from a substantially flat wall 19.
  • the metal cover 16 is made in one piece or in one piece to avoid sealing problems.
  • the cover 16 is crossed by the pins 13 and the tube 14.
  • the cover 16 is provided with openings 20 for the passage of the pins 13 and the tube 14, arranged in the wall 19.
  • the cover 16 is provided with localized conformations 22 each opening with an opening 20 to delimit a housing 23 for at least a portion of a seal 24.
  • the wall 19 is thus provided with three localized protruding formations 22 adapted to each receive a portion of the seals 24 disposed around the pins 13 and the tube 14, between the cover 16 and the electromagnetic actuator 6.
  • the shape of seals 24 is adapted to the shape of the pins 13 and the tube 14 to ensure sealing at the interface between the cover 16 and the pins 13 and the tube 14.
  • each seal 24 has a biconical shape. More specifically, each seal 24 has a frustoconical portion connected by its larger base to the larger base of another frustoconical portion. In the example shown, the three seals 24 form a single piece being connected to each other by connection zones 27. Of course, it can be envisaged to produce seals 24 independently with shapes. also different.
  • the protruding conformations 22 thus have a frustoconical shape complementary to the upper part of a seal 24.
  • the metal cap 16 has a surface d support 31 for an attachment nut 33 intended to cooperate with a thread made externally on the end of the tubular body 2.
  • the bearing surface 31 is formed by an annular shoulder extending radially from skirt 17 of the hood. The tightening of the fastening nut 33 on the tubular body 2 leads to the compression of the seals 24 thus contributing to sealing at the pins 13 and the tube 14. This compressing of the seals 24 thus seals the electromagnetic actuator 6.
  • a seal 34 is interposed between the bearing surface 31 and the electromagnetic actuator 6. The seal 34 cooperates with the internal wall of the tubular body 2 of the injector.
  • the assembly device 7 makes it possible to obtain the sealed mounting of the electromagnetic actuator 6 on the injector 1 since the cover 16 is sealingly mounted on the tubular body 2 by means of the seal 34. moreover, the presence of compressed seals 24 during assembly provides a sealed cover 16 at the tube 14 and pins 13 through said cover.
  • the metal cover 16 is a stamped sheet to achieve the invention in a simple and inexpensive way.
  • this metal cap has recessed or protruding formations 40 which favor the attachment of an overmolding coating 41.
  • the cover 16 is provided with an annular fold 40 at the level of the connection between the skirt 17 and the wall 19. Of course, it can be expected that these conformations are performed differently.
  • the overmolding coating 41 is made by a solid block of a material, for example thermoplastic or thermoset material.
  • a seal 24 is interposed between the cover 16 and the tube 14 which is independent of the metal cover 16.
  • it can be provided to mount the tube 14 integrally with the metal cap 16.
  • it may be envisaged to remove the seal 24 interposed between the tube 14 and the metal cap 16 to the extent that the tube 14 and the metal cap 16 are assembled tightly.
  • Fig. 4 illustrates another embodiment in which the metal cap 16 is mounted in the tubular body 2 of the injector via a mounting sleeve 45.
  • the metal cap 16 is mounted on the mounting sleeve 45 by a material discharge operation of the cover to ensure an assembly between the cover 16 and the sleeve 45.
  • a material discharge operation of the cover For example, it can be expected to fold a fallen edge 46 extending from the surface of support 31 of the metal hood.
  • the end of the metal cover 16 is folded to cooperate with an annular shoulder 47 of the mounting sleeve 45.
  • a seal 48 cooperating with the electromagnetic actuator 6 is mounted at the interface between the metal cap 16 and the mounting sleeve 45.
  • the mounting sleeve 45 comprises a receiving housing of the seal 48 bearing on the inner wall of the bearing surface 31.
  • the mounting sleeve 45 also has a seal 49 cooperating with the inner wall of the tubular body 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a sealed assembly device for an electromagnetic actuator for an injector on an internal combustion engine, the assembly device (7) comprising a metallic cover (16) which essentially encloses the electromagnetic actuator (6) in the length of the tubular body (2), and through which pins (13) pass and the tube (14) extends from the cover, the cover (16) being made in one piece. Said cover has a support surface (31) for a screw (33) such that tightening the same on the tubular body (2) brings about the compression by the cover of sealing joints (24) arranged at least around the pins (13) between the cover (16) and the actuator (6) to give a sealed assembly.

Description

DISPOSITIF D'ASSEMBLAGE POUR UN ACTIONNEUR ELECTROMAGNETIQUE DON INJECTEUR POUR MOTEUR A COMBUSTION INTERNE ASSEMBLY DEVICE FOR AN ELECTROMAGNETIC ACTUATOR DONOR INJECTOR FOR INTERNAL COMBUSTION ENGINE
L'objet de l'invention concerne un injecteur électromagnétique pour moteur à combustion interne.The subject of the invention relates to an electromagnetic injector for an internal combustion engine.
L'objet de l'invention concerne plus précisément le système de montage d'un actionneur électromagnétique faisant partie d'un injecteur pour moteur à combustion interne.The object of the invention relates more specifically to the mounting system of an electromagnetic actuator forming part of an injector for an internal combustion engine.
D'une manière classique, un injecteur pour moteur à combustion interne comporte un corps tubulaire muni à l'une de ses extrémités d'une buse d'injection de carburant dont l'ouverture est pilotée par un système de contrôle à valve comportant un actionneur électromagnétique agissant sur la valve. L'actionneur électromagnétique est fixé par un écrou sur l'extrémité du corps tubulaire de l'injecteur situé à l'opposé de celle pourvue de la buse d'injection. L'actionneur électromagnétique qui est pourvu de broches de raccordement électrique est également traversé par un tube de retour de carburant. Divers joints d'étanchéité sont montés pour assurer une étanchéité d'une part, entre le circuit électrique et le circuit de circulation du carburant et d'autre part, entre l'actionneur électromagnétique et le corps tubulaire de l'injecteur. Dans l'état de la technique, de nombreuses solutions ont été proposées pour assurer une telle étanchéité durable dans le temps, même dans des conditions sévères de sollicitations mécaniques. Toutefois, les solutions techniques qui donnent satisfaction en pratique s'avèrent relativement onéreuses et complexes à réaliser. Tel est le cas notamment de la solution préconisée par le brevetIn a conventional manner, an injector for an internal combustion engine comprises a tubular body provided at one of its ends with a fuel injection nozzle whose opening is controlled by a valve control system comprising an actuator electromagnetic acting on the valve. The electromagnetic actuator is fixed by a nut on the end of the tubular body of the injector located opposite to that provided with the injection nozzle. The electromagnetic actuator which is provided with electrical connection pins is also traversed by a fuel return tube. Various seals are mounted to ensure a seal on the one hand, between the electrical circuit and the fuel circulation circuit and on the other hand, between the electromagnetic actuator and the tubular body of the injector. In the state of the art, many solutions have been proposed to ensure such a durable seal over time, even under severe conditions of mechanical stress. However, technical solutions that are satisfactory in practice are relatively expensive and complex to achieve. This is particularly the case of the solution recommended by the patent
EP 0 483 768 qui décrit un injecteur électromagnétique dont le noyau magnétique de l'électroaimant est monté à l'intérieur d'une douille présentant un épaulement en forme d'anneau venant en appui sur un flasque d'un capuchon traversé par une broche de raccordement électrique entourée par un joint d'étanchéité. Cette solution, indépendamment des problèmes d'étanchéité, présente une fabrication complexe et relativement onéreuse. L'objet de l'invention vise donc à remédier aux inconvénients de l'état de la technique en proposant un dispositif d'assemblage simple et peu onéreux pour assurer une étanchéité pour un actionneur électromagnétique d'un injecteur pour moteur à combustion interne. Pour atteindre un tel objectif, le dispositif d'assemblage étanche pour un actionneur électromagnétique d'un injecteur pour moteur à combustion interne comporte un écrou de fixation sur un corps tubulaire de Pinjecteur de l'actionneur électromagnétique traversé par un tube de retour de carburant et équipé de deux broches de raccordement électrique. Selon l'invention, le dispositif d'assemblage comporte un capot métallique venant coiffer l'actionneur électromagnétique sensiblement dans le prolongement du corps tubulaire, et traversé par les broches et le tube faisant saillie hors du capot, le capot étant réalisé en une seule pièce et présentant une surface d'appui pour l'écrou de manière que son serrage sur le corps tubulaire assure la compression, par le capot, de joints d'étanchéité disposés au moins autour des broches entre le capot et l'actionneur en vue d'obtenir un montage étanche.EP 0 483 768 which describes an electromagnetic injector whose magnetic core of the electromagnet is mounted inside a bushing having a shoulder in the form of a ring bearing on a flange of a cap traversed by a pin of electrical connection surrounded by a seal. This solution, independently of sealing problems, has a complex and relatively expensive manufacturing. The object of the invention is therefore to overcome the drawbacks of the state of the art by proposing a simple and inexpensive assembly device to ensure a seal for an electromagnetic actuator of an injector for an internal combustion engine. To achieve such an objective, the sealed assembly device for an electromagnetic actuator of an injector for an internal combustion engine comprises a nut for fastening to a tubular body of the injector of the electromagnetic actuator traversed by a fuel return tube and equipped with two electrical connection pins. According to the invention, the assembly device comprises a metal cap to cap the electromagnetic actuator substantially in the extension of the tubular body, and through which the pins and the tube projecting out of the hood, the cap being made in one piece. and having a bearing surface for the nut so that its tightening on the tubular body squeezes, by the bonnet, seals arranged at least around the pins between the bonnet and the actuator in order to obtain a tight fitting.
Selon une forme préférée de réalisation, le capot métallique est une tôle emboutie.According to a preferred embodiment, the metal cap is a stamped sheet.
Selon une variante de réalisation, un joint d'étanchéité est disposé autour du tube de retour carburant entre le capot et l'actionneur électromagnétique, de sorte que lors du serrage de l'écrou de fixation, le joint d'étanchéité se trouve comprimé.According to an alternative embodiment, a seal is arranged around the fuel return tube between the cover and the electromagnetic actuator, so that when tightening the fixing nut, the seal is compressed.
De préférence, les joints d'étanchéité possèdent une forme biconique. Par exemple, les joints d'étanchéité forment une pièce unique. Selon une forme de réalisation, le capot métallique comporte des conformations localisées délimitant chacune un logement pour au moins une partie d'un joint d'étanchéité.Preferably, the seals have a biconical shape. For example, the seals form a single piece. According to one embodiment, the metal cap has localized conformations each delimiting a housing for at least a portion of a seal.
Selon une autre variante de réalisation, le tube de retour de carburant est fixé de manière étanche sur le capot métallique. Selon un exemple de réalisation, le capot est monté de manière étanche sur le corps tubulaire à l'aide d'un joint d'étanchéité interposé entre le capot et le corps tubulaire. Selon un autre exemple de réalisation, le capot est monté sur une douille de montage dans le corps tubulaire de l'injecteur.According to another embodiment, the fuel return tube is sealingly attached to the metal cap. According to an exemplary embodiment, the cover is sealingly mounted on the tubular body by means of a seal interposed between the cover and the tubular body. According to another embodiment, the cover is mounted on a mounting sleeve in the tubular body of the injector.
De préférence, le capot est monté sur la douille de montage par une opération de refoulement de matière du capot. Par exemple, le joint d'étanchéité est interposé entre la douille de montage et le capot.Preferably, the cover is mounted on the mounting sleeve by a material discharge operation of the cover. For example, the seal is interposed between the mounting sleeve and the cover.
Avantageusement, le joint d'étanchéité est interposé entre la douille de montage et le corps tubulaire.Advantageously, the seal is interposed between the mounting sleeve and the tubular body.
Selon un exemple de réalisation, le capot est pourvu de conformations en creux et/ou en saillie pour l'accrochage d'un enrobage de surmoulage.According to an exemplary embodiment, the cover is provided with recessed and / or protruding conformations for fastening an overmolding coating.
Un autre objet de l'invention est de proposer un injecteur pour moteur à combustion interne comportant un dispositif d'assemblage pour un actionneur électromagnétique conforme à l'invention.Another object of the invention is to provide an injector for an internal combustion engine comprising an assembly device for an electromagnetic actuator according to the invention.
Diverses autres caractéristiques ressortent de la description faite ci-dessous en référence aux dessins annexés qui montrent, à titre d'exemples non limitatifs, des formes de réalisation de l'objet de l'invention.Various other characteristics appear from the description given below with reference to the accompanying drawings which show, by way of non-limiting examples, embodiments of the subject of the invention.
La Figure 1 est une vue en perspective externe d'un exemple de réalisation d'un injecteur pour moteur à combustion interne.Figure 1 is an external perspective view of an embodiment of an injector for an internal combustion engine.
La Figure 2 est une vue partielle en coupe élévation montrant un premier exemple de réalisation d'un dispositif d'assemblage pour injecteur conforme à l'invention.Figure 2 is a partial elevational sectional view showing a first embodiment of an injector assembly device according to the invention.
La Figure 3 est une vue en perspective externe montrant le dispositif d'assemblage illustré à la Fig. 2.Figure 3 is an external perspective view showing the assembly device shown in FIG. 2.
La Figure 4 est une vue en coupe élévation montrant un autre exemple de réalisation d'un dispositif d'assemblage pour un injecteur conforme à l'invention.Figure 4 is an elevational sectional view showing another embodiment of an assembly device for an injector according to the invention.
Les Fig. 1 à 3 illustrent une première variante de réalisation d'un injecteur 1 pour moteur à combustion interne. Ce type d'injecteur est par exemple du type à rampe commune. Un tel injecteur électromagnétique 1 comporte un corps tubulaire 2 formant l'enveloppe externe de l'injecteur. De manière classique, l'injecteur 1 est pourvu à l'une de ses extrémités, d'une buse d'injection 4 du carburant. Un actionneur électromagnétique 6 est monté à l'aide d'un système d'assemblage 7 conforme à l'invention, sur l'extrémité du corps tubulaire 2 opposée de celle pourvue de la buse d'injection 4. L'actionneur électromagnétique 6 agit sur une valve d'un système 8 de contrôle de l'ouverture et fermeture de la buse d'injection 4. Ce système de contrôle 8 n'est pas décrit plus précisément car il est bien connu de l'homme du métier et ne fait pas partie précisément de l'objet de l'invention. De même, l'actionneur 6 qui ne fait pas partie précisément de l'objet de l'invention sera décrit uniquement pour les besoins de la description de l'objet de l'invention.Figs. 1 to 3 illustrate a first embodiment of an injector 1 for an internal combustion engine. This type of injector is for example of the common rail type. Such an electromagnetic injector 1 comprises a tubular body 2 forming the outer casing of the injector. In a conventional manner, the injector 1 is provided at one of its ends with an injection nozzle 4 for the fuel. An electromagnetic actuator 6 is mounted using an assembly system 7 according to the invention, on the end of the tubular body 2 opposite to that provided with the injection nozzle 4. The electromagnetic actuator 6 acts on a valve of a system 8 for controlling the opening and closing of the injection nozzle 4. This control system 8 is not described more precisely because it is well known to those skilled in the art and is not part of the subject of the invention. Similarly, the actuator 6 which is not part of the subject of the invention will be described solely for the purpose of describing the subject of the invention.
L'actionneur électromagnétique 6 comporte un corps cylindrique 11 dans lequel est noyé un bobinage 12 relié à deux broches de raccordement électrique 13 faisant saillie du corps cylindrique 11. De manière classique, le corps cylindrique 11 est traversé en son centre, par un tube 14 de retour du carburant faisant également saillie du corps cylindrique 11. Tel que cela ressort des Fïg. 2 et 3, les broches de raccordement 13 s'étendent ainsi en saillie de part et d'autre du tube 14. Conformément à l'invention, le système d'assemblage 7 comporte une coiffe ou un capot métallique 16 venant coiffer l'actionneur électromagnétique 6 sensiblement dans le prolongement du corps tubulaire 2. Le capot métallique 16 présente ainsi une jupe 17 de section circulaire enveloppant l'actionneur électromagnétique 6 sur au moins une partie de sa hauteur. La jupe 17 s'étend sensiblement à l'équerre à partir d'une paroi sensiblement plane 19. Le capot métallique 16 est réalisé en une seule pièce ou de manière monobloc pour éviter notamment les problèmes d'étanchéité.The electromagnetic actuator 6 comprises a cylindrical body 11 in which is embedded a winding 12 connected to two electrical connection pins 13 protruding from the cylindrical body 11. In a conventional manner, the cylindrical body 11 is traversed at its center by a tube 14 return of the fuel also protruding from the cylindrical body 11. As is apparent from the Fíg. 2 and 3, the connecting pins 13 thus extend projecting from either side of the tube 14. According to the invention, the assembly system 7 comprises a cap or a metal cap 16 to cap the actuator electromagnetic 6 substantially in the extension of the tubular body 2. The metal cover 16 and has a skirt 17 of circular section surrounding the electromagnetic actuator 6 over at least a portion of its height. The skirt 17 extends substantially to the square from a substantially flat wall 19. The metal cover 16 is made in one piece or in one piece to avoid sealing problems.
Le capot 16 est traversé par les broches 13 et le tube 14. A cet effet, le capot 16 est pourvu d'ouvertures 20 de passage pour les broches 13 et le tube 14, aménagées dans la paroi 19.The cover 16 is crossed by the pins 13 and the tube 14. For this purpose, the cover 16 is provided with openings 20 for the passage of the pins 13 and the tube 14, arranged in the wall 19.
Selon une caractéristique avantageuse de réalisation, le capot 16 est pourvu de conformations localisées 22 s'ouvrant chacune par une ouverture 20 pour délimiter un logement 23 pour au moins une partie d'un joint d'étanchéité 24. Tel que cela ressort plus précisément de la Fig. 3, la paroi 19 est ainsi pourvue de trois conformations saillantes localisées 22 adaptées pour recevoir chacune une partie des joints d'étanchéité 24 disposés autour des broches 13 et du tube 14, entre le capot 16 et l'actionneur électromagnétique 6. Bien entendu, la forme des joints d'étanchéité 24 est adaptée à la forme des broches 13 et du tube 14 afin d'assurer l'étanchéité au niveau de l'interface entre le capot 16 et les broches 13 et le tube 14.According to an advantageous characteristic of embodiment, the cover 16 is provided with localized conformations 22 each opening with an opening 20 to delimit a housing 23 for at least a portion of a seal 24. As is more particularly apparent from FIG. FIG. 3, the wall 19 is thus provided with three localized protruding formations 22 adapted to each receive a portion of the seals 24 disposed around the pins 13 and the tube 14, between the cover 16 and the electromagnetic actuator 6. Of course, the shape of seals 24 is adapted to the shape of the pins 13 and the tube 14 to ensure sealing at the interface between the cover 16 and the pins 13 and the tube 14.
Selon une variante préférée de réalisation, chaque joint d'étanchéité 24 possède une forme biconique. De manière plus précise, chaque joint d'étanchéité 24 comporte une partie tronconique reliée par sa plus grande base à la plus grande base d'une autre partie tronconique. Dans l'exemple illustré, les trois joints d'étanchéité 24 forment une pièce unique en étant reliés entre eux par des zones de raccordement 27. Bien entendu, il peut être envisagé de réaliser des joints d'étanchéité 24 de manière indépendante avec des formes également différentes.According to a preferred embodiment, each seal 24 has a biconical shape. More specifically, each seal 24 has a frustoconical portion connected by its larger base to the larger base of another frustoconical portion. In the example shown, the three seals 24 form a single piece being connected to each other by connection zones 27. Of course, it can be envisaged to produce seals 24 independently with shapes. also different.
Dans l'exemple illustré, les conformations saillantes 22 présentent ainsi une forme tronconique complémentaire à la partie supérieure d'un joint d'étanchéité 24. Selon une autre caractéristique de l'objet de l'invention, le capot métallique 16 comporte une surface d'appui 31 pour un écrou de fixation 33 destiné à coopérer avec un filetage réalisé extérieurement sur l'extrémité du corps tubulaire 2. Dans l'exemple illustré, la surface d'appui 31 est formée par un épaulement annulaire s'étendant radialement à partir de la jupe 17 du capot. Le serrage de l'écrou de fixation 33 sur le corps tubulaire 2 conduit à la compression des joints d'étanchéité 24 contribuant ainsi à assurer l'étanchéité au niveau des broches 13 et du tube 14. Cette mise en compression des joints d'étanchéité 24 assure ainsi l'étanchéité de l'actionneur électromagnétique 6. Dans l'exemple illustré, un joint d'étanchéité 34 est interposé entre la surface d'appui 31 et l'actionneur électromagnétique 6. Le joint d'étanchéité 34 coopère avec la paroi interne du corps tubulaire 2 de l'injecteur.In the example illustrated, the protruding conformations 22 thus have a frustoconical shape complementary to the upper part of a seal 24. According to another characteristic of the subject of the invention, the metal cap 16 has a surface d support 31 for an attachment nut 33 intended to cooperate with a thread made externally on the end of the tubular body 2. In the example illustrated, the bearing surface 31 is formed by an annular shoulder extending radially from skirt 17 of the hood. The tightening of the fastening nut 33 on the tubular body 2 leads to the compression of the seals 24 thus contributing to sealing at the pins 13 and the tube 14. This compressing of the seals 24 thus seals the electromagnetic actuator 6. In the illustrated example, a seal 34 is interposed between the bearing surface 31 and the electromagnetic actuator 6. The seal 34 cooperates with the internal wall of the tubular body 2 of the injector.
Le dispositif d'assemblage 7 permet d'obtenir le montage étanche de l'actionneur électromagnétique 6 sur l'injecteur 1 puisque le capot 16 est monté de manière étanche sur le corps tubulaire 2 à l'aide du joint d'étanchéité 34. De plus, la présence des joints d'étanchéité 24 comprimés lors de l'assemblage permet d'obtenir un capot 16 étanche au niveau du tube 14 et des broches 13 traversant ledit capot. Selon une variante de réalisation, le capot métallique 16 est une tôle emboutie permettant de réaliser l'invention de manière simple et peu coûteuse. De préférence, ce capot métallique comporte des conformations en creux ou en saillie 40 favorisant l'accrochage d'un enrobage de surmoulage 41. Dans l'exemple illustré, le capot 16 est pourvu d'un pli annulaire 40 au niveau de la zone de raccordement entre la jupe 17 et la paroi 19. Bien entendu, il peut être prévu que ces conformations se trouvent réalisées de manière différente. Par exemple, l'enrobage de surmoulage 41 est réalisé par un bloc massif d'un matériau par exemple thermoplastique ou thermodure. Selon la description qui précède, un joint d'étanchéité 24 est interposé entre la capot 16 et le tube 14 qui est indépendant du capot métallique 16. Selon une autre variante de réalisation, il est à noter qu'il peut être prévu de monter le tube 14 de manière solidaire au capot métallique 16. Selon cette forme de réalisation, il est à noter qu'il peut être envisagé de supprimer le joint d'étanchéité 24 interposé entre le tube 14 et le capot métallique 16 dans la mesure où le tube 14 et le capot métallique 16 sont assemblés de manière étanche.The assembly device 7 makes it possible to obtain the sealed mounting of the electromagnetic actuator 6 on the injector 1 since the cover 16 is sealingly mounted on the tubular body 2 by means of the seal 34. moreover, the presence of compressed seals 24 during assembly provides a sealed cover 16 at the tube 14 and pins 13 through said cover. According to an alternative embodiment, the metal cover 16 is a stamped sheet to achieve the invention in a simple and inexpensive way. Preferably, this metal cap has recessed or protruding formations 40 which favor the attachment of an overmolding coating 41. In the example illustrated, the cover 16 is provided with an annular fold 40 at the level of the connection between the skirt 17 and the wall 19. Of course, it can be expected that these conformations are performed differently. For example, the overmolding coating 41 is made by a solid block of a material, for example thermoplastic or thermoset material. According to the foregoing description, a seal 24 is interposed between the cover 16 and the tube 14 which is independent of the metal cover 16. According to another embodiment, it should be noted that it can be provided to mount the tube 14 integrally with the metal cap 16. According to this embodiment, it should be noted that it may be envisaged to remove the seal 24 interposed between the tube 14 and the metal cap 16 to the extent that the tube 14 and the metal cap 16 are assembled tightly.
La Fig. 4 illustre une autre variante de réalisation dans laquelle le capot métallique 16 est monté dans le corps tubulaire 2 de l'injecteur par l'intermédiaire d'une douille de montage 45. Selon cette variante de réalisation, le capot métallique 16 est monté sur la douille de montage 45 par une opération de refoulement de matière du capot permettant d'assurer un assemblage entre le capot 16 et la douille 45. Par exemple, il peut être prévue de replier un bord tombé 46 s'étendant à partir de la surface d'appui 31 du capot métallique. En d'autres termes, l'extrémité du capot métallique 16 est replié pour coopérer avec un épaulement annulaire 47 de la douille de montage 45. Bien entendu, il peut être aussi prévue de solidariser le capot métallique 16 avec la douille de montage 45 par l'intermédiaire d'opérations de poinçonnage.Fig. 4 illustrates another embodiment in which the metal cap 16 is mounted in the tubular body 2 of the injector via a mounting sleeve 45. According to this embodiment, the metal cap 16 is mounted on the mounting sleeve 45 by a material discharge operation of the cover to ensure an assembly between the cover 16 and the sleeve 45. For example, it can be expected to fold a fallen edge 46 extending from the surface of support 31 of the metal hood. In other words, the end of the metal cover 16 is folded to cooperate with an annular shoulder 47 of the mounting sleeve 45. Of course, it may also be provided to secure the metal cap 16 with the mounting sleeve 45 by through punching operations.
Selon cette variante de réalisation, un joint d'étanchéité 48 coopérant avec l'actionneur électromagnétique 6 est monté à l'interface entre le capot métallique 16 et la douille de montage 45. Dans l'exemple illustré, la douille de montage 45 comporte un logement de réception du joint d'étanchéité 48 venant en appui sur la paroi interne de la surface d'appui 31.According to this embodiment variant, a seal 48 cooperating with the electromagnetic actuator 6 is mounted at the interface between the metal cap 16 and the mounting sleeve 45. In the illustrated example, the mounting sleeve 45 comprises a receiving housing of the seal 48 bearing on the inner wall of the bearing surface 31.
La douille de montage 45 comporte également un joint d'étanchéité 49 coopérant avec la paroi interne du corps tubulaire 2.The mounting sleeve 45 also has a seal 49 cooperating with the inner wall of the tubular body 2.
L'invention n'est pas limitée aux exemples décrits et représentés car diverses modifications peuvent y être apportées sans sortir de son cadre. The invention is not limited to the examples described and shown because various modifications can be made without departing from its scope.

Claims

REVENDICATIONS
1 - Dispositif d'assemblage étanche pour un actionneur électromagnétique d'un injecteur pour moteur à combustion interne, le dispositif d'assemblage (7) comportant un écrou de fixation (33) sur un corps tubulaire (2) de Pinjecteur de l'actionneur électromagnétique (6) traversé par un tube (14) de retour de carburant et équipé de deux broches de raccordement électrique (13) caractérisé en ce que le dispositif d'assemblage (7) comporte un capot métallique (16) venant coiffer l'actionneur électromagnétique (6) sensiblement dans le prolongement du corps tubulaire (2), et traversé par les broches (13) et le tube (14) faisant saillie hors du capot, le capot (16) étant réalisé en une seule pièce et présentant une surface d'appui (31) pour l'écrou (33) de manière que son serrage sur le corps tubulaire (2) assure la compression, par le capot, de joints d'étanchéité (24) disposés au moins autour des broches (13) entre le capot (16) et l'actionneur (6) en vue d'obtenir un montage étanche. 2 - Dispositif d'assemblage selon la revendication 1, caractérisé en ce que le capot métallique (16) est une tôle emboutie.1 - Sealed assembly device for an electromagnetic actuator of an injector for an internal combustion engine, the assembly device (7) comprising a fixing nut (33) on a tubular body (2) of the injector of the actuator electromagnetic device (6) traversed by a fuel return tube (14) and equipped with two electrical connection pins (13), characterized in that the connecting device (7) comprises a metal cap (16) that caps the actuator electromagnetic (6) substantially in the extension of the tubular body (2), and traversed by the pins (13) and the tube (14) projecting from the hood, the cover (16) being formed in one piece and having a surface bearing (31) for the nut (33) so that its tightening on the tubular body (2) ensures the compression, by the hood, of seals (24) arranged at least around the pins (13) between the hood (16) and the actuator (6) to obtain a tight fitting. 2 - assembly device according to claim 1, characterized in that the metal cap (16) is a stamped sheet.
3 - Dispositif d'assemblage selon la revendication 1, caractérisé en ce qu'un joint d'étanchéité (24) est disposé autour du tube de retour carburant (14) entre le capot (16) et l'actionneur électromagnétique (6), de sorte que lors du serrage de l'écrou de fixation (33), le joint d'étanchéité (24) se trouve comprimé.3 - Connecting device according to claim 1, characterized in that a seal (24) is arranged around the fuel return tube (14) between the cover (16) and the electromagnetic actuator (6), so that when tightening the fixing nut (33), the seal (24) is compressed.
4 - Dispositif d'assemblage selon la revendication 1 ou 3, caractérisé en ce que les joints d'étanchéité (24) possèdent une forme biconique.4 - Connecting device according to claim 1 or 3, characterized in that the seals (24) have a biconical shape.
5 - Dispositif d'assemblage selon la revendication 4, caractérisé en ce que les joints d'étanchéité (24) forment une pièce unique. 6 - Dispositif d'assemblage selon l'une des revendications 1 à 5, caractérisé en ce que le capot métallique (16) comporte des conformations localisées (22) délimitant chacune un logement (23) pour au moins une partie d'un joint d'étanchéité (24).5 - Connecting device according to claim 4, characterized in that the seals (24) form a single piece. 6 - Connecting device according to one of claims 1 to 5, characterized in that the metal cap (16) comprises localized conformations (22) each defining a housing (23) for at least a portion of a seal of sealing (24).
7 - Dispositif d'assemblage selon la revendication 1, caractérisé en ce que le tube de retour de carburant (14) est fixé de manière étanche sur le capot métallique (16). 8 - Dispositif d'assemblage selon l'une des revendications 1 à 7, caractérisé en ce que le capot (16) est monté de manière étanche sur le corps tubulaire (2) à l'aide d'un joint d'étanchéité (34) interposé entre le capot (16) et le corps tubulaire (2). 9 - Dispositif d'assemblage selon l'une des revendications 1 à 7, caractérisé en ce que le capot (16) est monté sur une douille de montage (45) dans le corps tubulaire (2) de l'injecteur.7 - Fitting device according to claim 1, characterized in that the fuel return tube (14) is sealingly attached to the metal cap (16). 8 - Connecting device according to one of claims 1 to 7, characterized in that the cover (16) is sealingly mounted on the tubular body (2) with a gasket (34). ) interposed between the cover (16) and the tubular body (2). 9 - Assembly device according to one of claims 1 to 7, characterized in that the cover (16) is mounted on a mounting sleeve (45) in the tubular body (2) of the injector.
10 - Dispositif d'assemblage selon la revendication 9, caractérisé en ce que le capot (16) est monté sur la douille de montage (45) par une opération de refoulement de matière du capot.10 - Assembly device according to claim 9, characterized in that the cover (16) is mounted on the mounting sleeve (45) by a material discharge operation of the cover.
11 - Dispositif d'assemblage selon la revendication 9 ou 10, caractérisé en ce qu'un joint d'étanchéité (48) est interposé entre la douille de montage (45) et le capot (16).11 - An assembly device according to claim 9 or 10, characterized in that a seal (48) is interposed between the mounting sleeve (45) and the cover (16).
12 - Dispositif d'assemblage selon la revendication 11, caractérisé en ce qu'un joint d'étanchéité (49) est interposé entre la douille de montage (45) et le corps tubulaire (2).12 - An assembly device according to claim 11, characterized in that a seal (49) is interposed between the mounting sleeve (45) and the tubular body (2).
13 - Dispositif d'assemblage selon l'une des revendications 1 à 12, caractérisé en ce que le capot (16) est pourvu de conformations en creux et/ou en saillie (40) pour l'accrochage d'un enrobage de surmoulage (41). 14 - Injecteur pour moteur à combustion interne caractérisé en ce qu'il comporte un dispositif d'assemblage (7) pour un actionneur électromagnétique (6) conforme à l'une des revendications 1 à 13. 13 - Connecting device according to one of claims 1 to 12, characterized in that the cover (16) is provided with recessed and / or protruding formations (40) for the attachment of an overmolding coating ( 41). 14 - Injector for an internal combustion engine characterized in that it comprises an assembly device (7) for an electromagnetic actuator (6) according to one of claims 1 to 13.
PCT/FR2007/052388 2006-11-24 2007-11-23 Assembly device for an electromagnetic actuator for an injector on an internal combustion engine WO2008062144A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0655098A FR2909137B1 (en) 2006-11-24 2006-11-24 ASSEMBLY DEVICE FOR AN ELECTROMAGNETIC ACTUATOR OF AN INJECTOR FOR INTERNAL COMBUSTION ENGINE.
FR0655098 2006-11-24

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WO2008062144A2 true WO2008062144A2 (en) 2008-05-29
WO2008062144A3 WO2008062144A3 (en) 2008-07-10

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WO2009115150A1 (en) * 2008-03-19 2009-09-24 Robert Bosch Gmbh Sealed electric feedthrough
WO2010112317A1 (en) * 2009-04-02 2010-10-07 Robert Bosch Gmbh Fuel injection device
EP2253830A1 (en) * 2009-05-19 2010-11-24 Robert Bosch GmbH Bayonet magnet group

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US5927614A (en) * 1997-08-22 1999-07-27 Touvelle; Matthew S. Modular control valve for a fuel injector having magnetic isolation features
EP1628015A1 (en) * 2004-08-20 2006-02-22 Siemens Aktiengesellschaft Sealing arrangement of a piezo actuator of a fuel injector
DE102005017808A1 (en) * 2005-04-18 2006-10-19 Siemens Ag Adjusting drive for operating a fuel injection valve comprises a lid for covering a contact and/or sealing arrangement of the drive and having a first radial inner lid section and a second radial outer lid section

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EP0483768A1 (en) * 1990-10-31 1992-05-06 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Improvements to the assembly of an electromagnet core of an electromagnetic internal combustion engine fuel injector
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Publication number Priority date Publication date Assignee Title
WO2009115150A1 (en) * 2008-03-19 2009-09-24 Robert Bosch Gmbh Sealed electric feedthrough
WO2010112317A1 (en) * 2009-04-02 2010-10-07 Robert Bosch Gmbh Fuel injection device
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US9175652B2 (en) 2009-04-02 2015-11-03 Robert Bosch Gmbh Fuel injection device
EP2253830A1 (en) * 2009-05-19 2010-11-24 Robert Bosch GmbH Bayonet magnet group

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FR2909137A1 (en) 2008-05-30
FR2909137B1 (en) 2009-02-27

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