EP1630408B1 - Injecteur de carburant pour moteur à combustion interne et procédé de montage de cet injecteur - Google Patents

Injecteur de carburant pour moteur à combustion interne et procédé de montage de cet injecteur Download PDF

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Publication number
EP1630408B1
EP1630408B1 EP20050103817 EP05103817A EP1630408B1 EP 1630408 B1 EP1630408 B1 EP 1630408B1 EP 20050103817 EP20050103817 EP 20050103817 EP 05103817 A EP05103817 A EP 05103817A EP 1630408 B1 EP1630408 B1 EP 1630408B1
Authority
EP
European Patent Office
Prior art keywords
connecting part
piezoactuator
fuel injector
contacts
piezoelectric actuator
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.)
Not-in-force
Application number
EP20050103817
Other languages
German (de)
English (en)
Other versions
EP1630408B8 (fr
EP1630408A1 (fr
Inventor
Andreas Ernst
Roland Feigl
Marco Haller
Michael Koch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Siemens VDO Automotive AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens VDO Automotive AG filed Critical Siemens VDO Automotive AG
Publication of EP1630408A1 publication Critical patent/EP1630408A1/fr
Application granted granted Critical
Publication of EP1630408B1 publication Critical patent/EP1630408B1/fr
Publication of EP1630408B8 publication Critical patent/EP1630408B8/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion

Definitions

  • the present invention relates to a fuel injector for an internal combustion engine according to the preamble of claim 1.
  • a fuel injector is for example from the DE 198 44 743 C1 known.
  • This publication is concerned with the design of a contact tongue carrier, which is connected by a weld with contacts of a piezoelectric actuator and thus provides a line arrangement for electrical contacting of the piezoelectric actuator.
  • the known contact tongue carrier is suitable for direct welding only for fuel injectors, in which the contacts of the piezoelectric actuator viewed in the axial direction extend into the region of the contact assembly (eg plug connector). This is the case, in particular, when the piezoactuator inside the injector housing, viewed in the axial direction, is arranged relatively close to the contact subassembly.
  • the known contact tongue carrier is unsuitable for making electrical contact with a piezoelectric actuator provided with relatively short contacts, which is arranged in the axial direction in a more or less large distance from the contact module in the injector housing.
  • the effort for welding the contacts of the piezoelectric actuator is disadvantageous in a mounted by means of the contact tongue carrier fuel injector.
  • a fuel injector with an electromagnetic actuator is known.
  • the electrical contacting of the actuator is carried out by inserting a relatively complex trained connection arrangement (with two approximately conical connecting legs) in two obliquely extending through a Injektorgepatdung connection passages.
  • a fuel injector according to the preamble of claim 1 is for example from the EP 0 222 097 A1 , of the DE 38 00 203 A1 and the DE 102 05 909 A1 known.
  • the line arrangement is formed by a connecting part inserted axially between the contact module and the piezoactuator, at whose end facing the piezoelectric actuator spring contacts are arranged, which abut against the contacts of the piezoactuator with contact surfaces which can be deflected.
  • the electrical contacting of the piezoelectric actuator is thus considerably simplified. In particular, it is not necessary to weld the contacts of the piezoelectric actuator with the line arrangement.
  • the invention allows a fuel injector, in which the electrical contacting of a piezo actuator already mounted in the injector in a very simple manner by inserting a prefabricated unit (connecting part) takes place during assembly.
  • the sleeve-shaped injector housing in the region of the connecting part has an annularly closed, axially extending housing inner wall which encloses the connecting part formed with an axially extending peripheral surface with slight play.
  • This structural adaptation of the connecting part to the housing inner wall results in a simple insertion of the connecting part and at the same time a certain guidance of the connecting part during insertion.
  • the housing inner wall provided in the region of the connecting part and the peripheral surface of the connecting part guided therefrom can, for example, be substantially cylindrical.
  • other cross-sectional shapes of these mutually facing surfaces are conceivable as long as the design makes it possible for the connecting part to be pushed into this housing section in the axial direction.
  • conical surfaces are also conceivable in principle.
  • connection part provided according to the invention can advantageously be adapted to the distance of the relevant injector design.
  • spring contacts eg made of spring steel
  • This vibration resistance is often superior in practice to the corresponding strength of a welded joint.
  • the spring contacts of the connecting part can reliably reach the contacts of the piezoelectric actuator for engagement or engaged.
  • automated assembly steps can be simplified by such an anti-rotation device.
  • the line ends at the other end of the connection part should be considered, in particular, at the position which is well defined by a rotation lock. The electrical continuity occurring there can then be automated without any problems with regard to the angular position of the connecting part.
  • the axially extending housing inner wall has at least one radial indentation and / or indentation, which engages in a rotationally locking manner in engagement with a corresponding indentation or indentation of the axially extending peripheral surface of the connecting part is.
  • an end face of the connecting part facing the piezoactuator has at least one axial sublime and / or recess which engages in a rotationally locking manner in engagement with a corresponding recess or grandeur of an end face of the piezoactuator facing the connecting part.
  • the piezoelectric actuator at its end facing the connecting part to a so-called head plate, which is provided with axial passages, so that axially projecting contacts of the piezoelectric actuator can pass through these passages.
  • a per se known top plate may have at least one of the above-mentioned axial recesses or sublime in order to provide an anti-rotation device for the connecting part in the context of the invention.
  • connecting part A simple production of the connecting part is obtained, for example, if this is designed as a plastic molded part, wherein for the realization of the line arrangement between the two axial ends of the connecting part extending lines and / or the spring contacts can be formed in such a connecting part in a simple manner.
  • lead wires electrically connected (eg, welded) to spring contact units may be molded into the plastic material.
  • the electrical connection between the spring contacts of the connecting part and the contacts of the piezoelectric actuator - in a sense "automatically” - simply by inserting the connecting part in the axial direction in the relevant Injektorgepurabites.
  • the contacts of the piezoelectric actuator as axially projecting from the piezoelectric actuator contacts, in particular contact pins are formed, which come when inserting the connecting part with its spring contacts to the system or in engagement.
  • the spring contacts may, for example, have contact surfaces which extend substantially orthogonally to the axial direction and spring down in the axial direction, which run against the end faces of the contacts of the piezoactuator, which are designed, for example, as axially projecting pins, during assembly of the connection part.
  • axially projecting contact pins of the piezoelectric actuator at their peripheral surfaces with suitably formed (radially resilient) spring contact surfaces come into contact.
  • the spring contacts are designed as spring terminal contacts for clamping the contacts projecting from the piezoelectric actuator.
  • the contact pins are each loaded on their peripheral surface of at least two sides radially by spring contact surfaces of a spring contact.
  • Such a contact pin radially contacting contact surfaces can be achieved, for example, by extending obliquely to the axial spring contact tongues, which are displaced in the assembly of the connecting part by the axially projecting pins of the piezo actuator slightly in the radial direction and then radially load the relevant contact pin due to their spring action.
  • Such spring contact tongues can be distributed individually in the circumferential direction and / or annularly closed (in total, for example, conical). Due to the oblique course of (for example, compared to the transverse extent of the pins thin) spring contact tongues it is possible by such an inclination to achieve a "barb effect" of the spring terminal contact, through which a once inserted into the spring terminal contact pin of the piezoelectric actuator is reliably engaged.
  • Fig. 5 illustrates the known per se, basic structure of a piezobetätigten fuel injector 1 for an internal combustion engine.
  • the illustrated fuel injector 1 is a diesel injector for use in a reservoir injection system for the internal combustion engine of a motor vehicle.
  • the fuel injector 1 includes a fuel injection valve 12 disposed at a lower end of an injector housing 10 elongated in an axial direction A, a piezoactuator 14 for actuating the fuel injection valve 12 disposed in a middle portion of the injector housing 10, and a contact assembly 16 disposed at an upper end of the injector housing 10 electrical connection of the fuel injector 1 via a connector 18 to an injection control unit.
  • Essential for the present invention is the realization of the electrical contacting of the piezoelectric actuator 14, ie the Producing an electrical connection between contacts of the piezoelectric actuator 14 and arranged at an axial distance to the contact assembly 16.
  • this connecting part 20 is arranged directly above the piezoactuator 14 during assembly of the fuel injector 1.
  • Fig. 1 shows the total cylindrical connecting part 20 in AxiallCodesterrorism. It is formed as a plastic molded part comprising a connecting sleeve body 22 made of plastic with therein molded lead wires 24 and also molded, electrically connected to the lead wires spring contacts 26.
  • a pair of these wires 24 having a uniform cross section extends parallel to each other in the axial direction A.
  • z. B. in adaptation to the further Mulltechniksverlauf in the region of the contact assembly 16, the emerging at the upper end ends of the lead wires 24 have a changing in the course of cross-section and / or mutual distance.
  • the emerging at the upper end of the connecting part 20 lead wire ends can be welded, for example, in the region of the contact assembly, z. B. using a contact tongue carrier, as in the aforementioned DE 198 44 743 C1 described. In this case, although a welding process remains during the assembly of the fuel injector. However, this step can then be carried out very comfortably be, especially without a space shortage caused by the injector.
  • the connecting part 20 then has, as it were, the function of an "extension" of the contacts of the piezoelectric actuator upwards.
  • the conductor wire ends emerging at the upper end of the connecting part 20 can be contacted via a plug connection on the contact module 16.
  • connection part 20 at the other end with spring contacts, which are also electrically connected to the molded lines.
  • additional spring contacts can z. B. be designed as the intended for contacting the piezoelectric actuator towards spring contacts (eg., For insertion of contact pins of the contact assembly).
  • Each of spring contact 26 is formed by an approximately cylindrical, elongated in the axial direction A cavity for receiving contact pins 28, as shown in the assembled state of FIG. 4 can be seen in the assembled state ,
  • one of two positioning pins 30 can also be seen, which are arranged at a lower end face of the connecting part 20 in the axial direction A, diametrically opposite one another (see also FIG. 2).
  • the two positioning pins 30 are arranged in this embodiment such that their connection line is orthogonal to a corresponding connecting line between the two spring contacts 26 and thus there are two equivalent mounting positions for the connecting part 20, in which the connecting part 20 introduced from above into the Injektorgeophuse 10 and over the Spring contacts 26 can be brought into electrical contact with the piezoelectric actuator 14.
  • the positioning pins 30 are in engagement with positioning pin receptacles 32 provided correspondingly on the upper side of the piezoactuator 14.
  • Such recesses 32 can be easily attached be formed of the top facing a top plate, which is usually present anyway at this point of the piezoelectric actuator 14.
  • a top plate Corresponding to the arrangement of the spring contacts 26, such a top plate with axial openings or bushings for the passage of the projecting in the axial direction of the contact pins 28 of the piezoelectric actuator 14 may be provided.
  • the connecting part 20 has a cylindrical circumferential or lateral surface whose diameter is dimensioned slightly smaller than the diameter of the housing inner wall also in this section of the injector 10, the peripheral surface of the connecting part 20 and corresponding thereto, the housing inner wall the injector 10 are designed such that the desired rotational position of the connecting part 20 is already ensured when inserted into the corresponding housing portion.
  • This measure also simplifies the assembly of the fuel injector and can be realized for example by at least one radial bulge of the housing inner wall, which engages in a corresponding recess of an axially extending peripheral surface of the connecting part 20.
  • Such an alternative design of the peripheral surface of the connecting part 20 is shown in dashed lines in the plan view of FIG. 3 (indentations 34).
  • the spring contacts 26 each have three pairs of such obliquely to the axial direction A provided spring tongues that after the arrival of the contact pins 28 of the piezoelectric actuator 14 in the spring contact receiving spaces these pins 28 are clamped between the individual pairs of spring tongues and prevented from re-emergence.
  • the spring contacts 26 thus provide a mechanically and electrically reliable spring clamp connection between the lead wires 24 and the contact pins 28.
  • the connecting part 20 provided for electrical contacting of the piezoactuator 14 is inserted from above into the sleeve-shaped injector housing 10 and thus electrically connected to the piezoactuator 14 after installation of the piezoactuator 14 in the injector housing 10. Subsequently, in one or more working steps (eg with a plastic extrusion coating), the contact assembly 16 is formed at the upper end of the fuel injector.
  • the connecting part 20 is first attached to the top of the piezoelectric actuator 14 and the thus formed composite is installed in the injector housing 10.

Claims (8)

  1. Injecteur de carburant pour un moteur à combustion interne, comportant une soupape d'injection de carburant (12), agencée au niveau d'une extrémité inférieure d'un boîtier d'injecteur (10) allongé dans un sens axial (A), un actionneur piézoélectrique (14), monté dans une zone centrale du boîtier d'injecteur (10) et destiné à actionner la soupape d'injection de carburant (12), et un module de contact (16), qui est monté sur une extrémité supérieure du boîtier d'injecteur (10) et est destiné au raccordement électrique de l'injecteur de carburant et qui est relié à des contacts (28) de l'actionneur piézoélectrique (14) pour la mise en contact électrique de l'actionneur piézoélectrique (14) par l'intermédiaire d'un système conducteur s'étendant dans le sens axial entre le module de contact (16) et l'actionneur piézoélectrique (14), le système conducteur étant formé par un élément de liaison (20) inséré dans le sens axial entre le module de contact (16) et l'actionneur piézoélectrique (14), caractérisé en ce que le boîtier d'injecteur (10) comporte, dans la zone de l'élément de liaison (20), une paroi intérieure circulaire fermée, orientée dans le sens axial, laquelle enserre avec un faible jeu l'élément de liaison (20) réalisé avec une surface périphérique orientée dans le sens axial, et en ce que sur l'extrémité de l'élément de liaison (20), orientée vers l'actionneur piézoélectrique (14), sont agencés des contacts flexibles (26) qui sont en appui avec des surfaces de contact flexibles contre les contacts (28) de l'actionneur piézoélectrique (14).
  2. Injecteur de carburant selon la revendication 1, dans lequel la paroi intérieure de boîtier, orientée dans le sens axial, comporte au moins un creux radial et/ou une bosse radiale, qui est en prise de manière immobile en rotation avec une bosse ou un creux (34) correspondants sur la surface périphérique axiale de l'élément de liaison (20).
  3. Injecteur de carburant selon l'une quelconque des revendications précédentes, dans lequel une face frontale de l'élément de liaison (20), orientée vers l'actionneur piézoélectrique (14), possède au moins une bosse (30) axiale et/ou un évidement axial qui est en prise de manière immobile en rotation avec une bosse ou un évidement (32) correspondants sur une face frontale de l'actionneur piézoélectrique (14), orientée vers l'élément de liaison (20).
  4. Injecteur de carburant selon l'une quelconque des revendications précédentes, dans lequel l'actionneur piézoélectrique (14) comporte, sur son extrémité orientée vers l'élément de liaison (20), une plaque supérieure munie de trous débouchants axiaux pour le passage des contacts (28) de l'actionneur piézoélectrique (14), en saillie dans le sens axial.
  5. Injecteur de carburant selon l'une quelconque des revendications précédentes, dans lequel des conducteurs (24), qui s'étendent entre les deux extrémités axiales de l'élément de liaison (20), sont moulés à l'intérieur de l'élément de liaison (20).
  6. Injecteur de carburant selon la revendication 5, dans lequel des fils conducteurs (24) s'étendant entre les deux extrémités axiales de l'élément de liaison (20) sont moulés dans l'élément de liaison (20).
  7. Injecteur de carburant selon la revendication 5 ou 6, dans lequel les contacts flexibles (26) sont moulés dans l'élément de liaison (20).
  8. Injecteur de carburant selon l'une quelconque des revendications précédentes, dans lequel les contacts flexibles (26) sont réalisés sous forme de contacts de serrage flexibles pour bloquer les contacts (28) en saillie sur l'actionneur piézoélectrique (14).
EP20050103817 2004-08-25 2005-05-09 Injecteur de carburant pour moteur à combustion interne et procédé de montage de cet injecteur Not-in-force EP1630408B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410041170 DE102004041170A1 (de) 2004-08-25 2004-08-25 Kraftstoffinjektor für eine Brennkraftmaschine sowie Verfahren zur Montage eines derartigen Kraftstoffinjektors

Publications (3)

Publication Number Publication Date
EP1630408A1 EP1630408A1 (fr) 2006-03-01
EP1630408B1 true EP1630408B1 (fr) 2008-01-02
EP1630408B8 EP1630408B8 (fr) 2008-05-07

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ID=34939737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050103817 Not-in-force EP1630408B8 (fr) 2004-08-25 2005-05-09 Injecteur de carburant pour moteur à combustion interne et procédé de montage de cet injecteur

Country Status (2)

Country Link
EP (1) EP1630408B8 (fr)
DE (2) DE102004041170A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005024196B4 (de) * 2005-05-25 2013-05-23 Continental Automotive Gmbh Kraftstoffinjektor für eine Brennkraftmaschine sowie Verfahren zur Montage eines derartigen Kraftstoffinjektors
DE102007027665A1 (de) * 2007-06-15 2008-12-18 Robert Bosch Gmbh Piezoaktormodul mit Kabeldurchführungen und ein Verfahren zu dessen Herstellung
DE102010005158A1 (de) * 2010-01-20 2011-04-21 Continental Automotive Gmbh Elektrische Anschlussvorrichtung, Aktoreinheit und Einspritzventil
DE102013221515A1 (de) * 2013-10-23 2015-04-23 Continental Automotive Gmbh Injektor und Kontaktelement für diesen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3532660A1 (de) * 1985-09-13 1987-03-26 Atlas Fahrzeugtechnik Gmbh Kraftstoffeinspritzventil
DE3800203C2 (de) * 1988-01-07 1997-08-14 Atlas Fahrzeugtechnik Gmbh Kraftstoffeinspritzventil
GB2332476B (en) * 1997-12-19 2002-01-16 Caterpillar Inc Fuel injector with solenoid and terminal assemblies
DE19844743C1 (de) * 1998-09-29 2000-06-08 Siemens Ag Kontaktzungenträger zur Abdichtung und Positionierung von Kontaktstiften
DE10205909B4 (de) * 2002-02-13 2005-11-10 Siemens Ag Dichtungselement für den Piezoaktor eines Kraftstoff-Einspritzventils

Also Published As

Publication number Publication date
EP1630408B8 (fr) 2008-05-07
DE102004041170A1 (de) 2006-03-09
EP1630408A1 (fr) 2006-03-01
DE502005002380D1 (de) 2008-02-14

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