EP2003329B1 - Connecteur électrique pour injecteur, unité d'actionneur pour actionneur, injecteur et procédé de couplage d'un premier élément connecteur vers un second élément connecteur d'un connecteur électrique pour injecteur - Google Patents

Connecteur électrique pour injecteur, unité d'actionneur pour actionneur, injecteur et procédé de couplage d'un premier élément connecteur vers un second élément connecteur d'un connecteur électrique pour injecteur Download PDF

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Publication number
EP2003329B1
EP2003329B1 EP20070011712 EP07011712A EP2003329B1 EP 2003329 B1 EP2003329 B1 EP 2003329B1 EP 20070011712 EP20070011712 EP 20070011712 EP 07011712 A EP07011712 A EP 07011712A EP 2003329 B1 EP2003329 B1 EP 2003329B1
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EP
European Patent Office
Prior art keywords
connector
connector element
injector
electric conductor
coupling
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.)
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Application number
EP20070011712
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German (de)
English (en)
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EP2003329A1 (fr
Inventor
Valerio Polidori
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
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Continental Automotive GmbH
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Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to DE200760009507 priority Critical patent/DE602007009507D1/de
Priority to EP20070011712 priority patent/EP2003329B1/fr
Publication of EP2003329A1 publication Critical patent/EP2003329A1/fr
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Publication of EP2003329B1 publication Critical patent/EP2003329B1/fr
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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

Definitions

  • the invention relates to an electrical connector for an injector, an actuator unit for an injector, an injector and a method for coupling a first connector element to a second connector element of an electrical connector for an injector.
  • Injectors are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • the respective injector may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example the range of up to 200 bar or in the case of diesel engines in the range of up to 2,000 bar.
  • the injection of fluids under such high pressures has to be carried out very precisely.
  • Injectors for an internal combustion engine comprise actuator units.
  • the actuator unit In order to inject fuel, the actuator unit is energized so that a fluid flow through the fluid outlet portion of the injector is enabled.
  • DE 10 2005 024 196 A1 discloses a fuel injector, for an internal combustion motor, with a piezo actuator to operate the injection valve.
  • a circuit with contact pins is arranged between the group of contacts and the actuator as a connection component group with two sections. The actuator contact pins are each held at the clamp contacts of the sections.
  • the object of the invention is to create an electrical connector for an injector, an actuator unit and an injector which are simply to be manufactured and which facilitate a reliable and precise function of the injector. Furthermore, the object of the invention is to create a method for coupling a first connector element to a second connector element of an electrical connector for an injector that is simply to realize and which facilitates a reliable and precise function of the injector.
  • the invention is distinguished by an electrical connector for an injector comprising a first connector element and a second connector element, the first connector element comprising a connector body, and an electric conductor being mechanically coupled to the connector body, being designed for an electrical coupling to a power supply and having an external electric conductor section outside the connector body, the external electric conductor section extending in a longitudinal direction,
  • the second connector element comprising a supporting element being designed as a cylinder with a longitudinal axis, a first electric pin being rigidly coupled to the supporting element and being designed for an electrical coupling to an actuator unit of the injector, and a second electric pin being rigidly coupled to the supporting element and electrically coupled to the first electric pin, the second electric pin being electrically coupled to the external electric conductor section of the first connector element in a mechanically tension-free manner and extending in a plane being parallel to the longitudinal direction of the external electric conductor section.
  • the second electric pin is extending in the longitudinal direction of the external electric conductor section. This has the advantage that a coupling of the electrical connector in a mechanically preload-free manner is possible.
  • the longitudinal direction of the second electric pin is perpendicular to the longitudinal axis of the supporting element. This has the advantage that a simple construction of the electrical connector is possible.
  • the coupling between the second electric pin and the external electric conductor section is a laser-welded coupling.
  • This has the advantage that laser-welding is a simple and secure coupling method. Additionally, a high repeatability and stability of the coupling is obtainable. Furthermore, little need for the inspection of the coupling area is necessary.
  • the invention is distinguished by an actuator unit with an electrical connector according to the first aspect of the invention and a piezo actuator, wherein the piezo actuator is mechanically coupled to the second connector element of the electrical connector and is designed as a cylinder with a axis extending in direction of the longitudinal axis of the supporting element of the second connector element.
  • the invention is distinguished by an injector comprising the actuator unit of the second aspect of the invention, with the actuator unit being designed for acting on the valve assembly.
  • the invention is distinguished by a method for coupling a first connector element of an electrical connector for an injector to an second connector element, the first connector element comprising a connector body, and an electric conductor being mechanically coupled to the connector body, being designed for an electrical coupling to a power supply and having an external electric conductor section outside the connector body, the external electric conductor section extending in a longitudinal direction, the second connector element comprising a supporting element being designed as a cylinder with a longitudinal axis, a first electric pin being rigidly coupled to the supporting element and being designed for an electrical coupling to the actuator unit of the injector, and a second electric pin being rigidly coupled to the supporting element and electrically coupled to the first electric pin, the method comprising the following steps: providing the first connector element and the second connector element, aligning the external electric conductor section of the first connector element relative to the second electric pin of the second connector element to obtain a defined position of the first connector element relative to the second connector element, so that the external electric conductor section of the first connector element and the
  • An injector 10 ( figure 1 ) that is used as a fuel injector for an internal combustion engine, comprises an actuator unit 14 and a valve assembly 60.
  • the injector 10 has a housing 12 with a tubular shape and a central longitudinal axis A and a cavity 24 which is axially led through the housing 12.
  • the actuator unit 14 is inserted into the cavity 24 of the housing 12 and comprises a piezo actuator 16, which changes its axial length depending on a control signal applied to it.
  • a piezo actuator housing 17 encloses the piezo actuator 16 so that the piezo actuator 16 is stored in a mechanical robust manner.
  • the injector 10 has an electrical connector 50 ( figure 2 ) which is electrically and mechanically coupled to the piezo actuator 16 to supply the piezo actuator 16 with electric energy.
  • the valve assembly 60 comprises a valve body 20 and a part of the cavity 24 which is axially led through the valve body 20.
  • the cavity 24 of the housing 12 comprises a fluid inlet portion 26.
  • the fluid inlet portion 26 is designed to be connected to a high pressure fuel chamber of an internal combustion engine, the fuel is stored under high pressure, for example, under the pressure of above 200 bar.
  • a fluid outlet portion 28 is formed which is closed or open depending on the axial position of a valve needle 22.
  • the valve body 20 has a valve body spring rest 32 and the valve needle 22 comprises a valve needle spring rest 34, both spring rests 32, 34 supporting a spring 30 arranged between the valve body 20 and the valve needle 22.
  • the injector 10 is of an outward opening type. In an alternative embodiment of the injector 10 it may be of an inward opening type.
  • a bellow 36 is arranged which is sealingly coupling the valve body 20 with the valve needle 22. By this a fluid flow between the cavity 24 and a chamber 38 is prevented.
  • the bellow 36 is formed and arranged in a way that the valve needle 22 is actuable by the actuator unit 14.
  • FIG. 2 shows a detailed view of the electrical connector 50.
  • the piezo actuator housing 17 enclosing the piezo actuator 16 comprises a top cap 42.
  • the top cap 42 of the piezo actuator housing 17 is arranged at an end of the piezo actuator 16 facing away from the valve assembly 60.
  • the actuator unit 14 further comprises a piston 46.
  • a thermal compensator unit 40 is arranged in the cavity 24 of the housing 12 and is mechanically coupled to the piston 46 of the piezo actuator 16.
  • the thermal compensation unit 40 enables to set an axial preload force on the actuator unit 14 via the piston 46 to compensate changes of the fluid flow through the fluid outlet portion 28 in the case of temperature changes of the injector 10.
  • the piezo actuator 16 further comprises electric pins 41 to supply the piezo actuator 16 with electric energy.
  • the piezo actuator 16 changes its length in axial direction depending on electric energy supplied to it. By changing its length the piezo actuator 16 can exert a force to the valve needle 22. The force from the piezo actuator 16 being exerted to the valve needle 22 in an axial direction allows or prevents a fluid flow through the fluid outlet portion 28.
  • the electrical connector 50 of the injector 10 further comprises a first connector element 43 with a non-conductive connector body 44 in which an electric conductor 45 is arranged. Outside the connector body 44 the electric conductor 45 has an extern electric conductor section 45a extending in a longitudinal direction D. Electric energy can be supplied to the electric conductor 45 of the first connector element 43 by a not shown power supply.
  • the electrical connector 50 of the injector 10 further comprises a second connector element 47 consisting of a supporting element 48 and first electric pins 49a and second electric pins 49b which are rigidly coupled to the supporting element 48.
  • the supporting element 48 consists of plastic or another non-conductive material.
  • the extern electric conductor section 45a of the first connector element 43 is electrically coupled to one of the second electric pins 49b of the second connector element 47 which is electrically coupled to one of the first electric pins 49a which on its part is electrically coupled to one of the electric pin 41 of the piezo actuator 16. Consequently, electric energy can be supplied to the piezo actuator 16 via the first connector element 43 and the second connector element 47 in a simple manner.
  • Figure 3 shows the electrical connector 50 with the first connector element 43 and the second connector element 47 in a schematic perspective view.
  • a plane P is extending parallel to the longitudinal direction D of the extern electric conductor section 45a.
  • the plane P is the plane in which the second electric pin 49b of the second connector element 47 is arranged.
  • a smallest angle between the plane P and the longitudinal axis A of the supporting element 48 of the second connector element 47 is equal to an angle ALPHA between the longitudinal direction D of the extern electric conductor section 45a and the longitudinal axis A.
  • Figure 3 shows two possible positions I and II of the second electric pin 49b.
  • the first connector element 43 is shown in a distance from the second connector element 47 although in a more realistic representation the first connector element 43 would be very near to the second connector element 47 similar to figure 2 .
  • FIG 2 a particular constellation of the angle ALPHA between the longitudinal direction D of the extern electric conductor section 45a and the longitudinal axis A is shown with the Angle ALPHA being equal 90°, and the second electric pin 49b extending in the longitudinal direction D of the extern electric conductor section 45a.
  • the first connector element 43 and the second connector element 47 of the injector 10 are provided.
  • the extern electric conductor section 45a of the first connector element 43 is aligned relative to the second electric pin 49b of the second connector element 47.
  • a defined position of the first connector element 43 relative to the second connector element 47 can be obtained, so that the extern electric conductor section 45a of the first connector element 43 and the second electric pin 49b of the second connector element 47 can be mechanically coupled in a manner free of mechanical tensions.
  • the extern electric conductor section 45a of the first connector element 43 is coupled to the second electric pin 49b of the second connector element 47 to provide an electric coupling between the first connector element 43 and the second connector element 47.
  • the coupling between the second electric pin 49b and the extern electric conductor section 45a is carried out by laser-welding.
  • laser-welding is a simple and very secure coupling method and the coupling can be carried out with a high repeatability and a good stability.
  • the fluid is led from the fluid inlet portion 26 through the housing 12 to the fluid outlet portion 28.
  • the valve needle 22 prevents a fluid flow through the fluid outlet portion 28 in the valve body 20 in a closing position of the valve needle 22. Outside of the closing position of the valve needle 22, the valve needle 22 enables the fluid flow through the fluid outlet portion 28.
  • the piezo actuator 16 may change its axial length if it is energized. By changing its length the piezo actuator 16 may exert a force on the valve needle 22.
  • the valve needle 22 is able to move in axial direction out of the closing position. Outside the closing position of the valve needle 22 there is a gap between the valve body 20 and the valve needle 22 at an axial end of the injector 10 facing away from the piezo actuator 16.
  • the spring 30 can force the valve needle 22 via the valve needle spring rest 34 towards the piezo actuator 16. In the case the piezo actuator 17 is de-energized the piezo actuator 16 shortens its length.
  • the spring 30 can force the valve needle 22 to move in axial direction in its closing position. It is depending on the force balance between the force on the valve needle 22 caused by the piezo actuator 16 and the force on the valve needle 22 caused by the spring 30 whether the valve needle 22 is in its closing position or not.

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

Claims (5)

  1. Connecteur électrique (50) pour un injecteur (10) comprenant un premier élément connecteur (43) et un second élément connecteur (47),
    le premier élément connecteur (43) comprenant
    - un corps de connecteur (44), et
    - un conducteur électrique (45) étant couplé mécaniquement au corps de connecteur (44), étant conçu pour un couplage électrique à une source d'alimentation et ayant une section de conducteur électrique externe (45a) s'étendant dans une direction longitudinale (D),
    le second élément connecteur (47) comprenant
    - un élément de support (48) ayant la forme d'un cylindre avec un axe longitudinal (A),
    - une première broche électrique (49a) étant couplée de façon rigide à l'élément de support (48) et étant conçue pour un couplage électrique à une unité d'actionneur (14) de l'injecteur (10), et
    - une seconde broche électrique (49b) étant couplée de façon rigide à l'élément de support (48) et couplée électriquement à la première broche électrique (49a),
    caractérisé en ce que
    la seconde broche électrique (49b) est couplée électriquement à la section de conducteur électrique externe (45a) du premier élément connecteur (43) de manière mécanique sans tension et s'étend dans un plan (P) parallèle à la direction longitudinale (D) de la section de conducteur électrique externe (45a), la seconde broche électrique (49b) s'étendant dans la direction longitudinale (D) de la section de conducteur électrique externe (45a), moyennant quoi la section de conducteur électrique externe (45a) est agencée à l'extérieur du corps de connecteur (44), et en ce que la direction longitudinale (D) de la seconde broche électrique (49b) est perpendiculaire à l'axe longitudinal (A) de l'élément de support (48).
  2. Connecteur électrique (50) selon la revendication 1, dans lequel le couplage entre la seconde broche électrique (49b) et la section de conducteur électrique externe (45a) est un couplage soudé au laser.
  3. Unité d'actionneur (14) comprenant un connecteur électrique (50) selon l'une des revendications précédentes et un actionneur piézoélectrique (16), dans laquelle l'actionneur piézoélectrique (16) est couplé mécaniquement au second élément connecteur (47) du connecteur électrique (50) et se présente sous la forme d'un cylindre avec un axe s'étendant en direction de l'axe longitudinal (A) de l'élément de support (48) du second élément connecteur (47).
  4. Injecteur (10) comprenant un ensemble de soupape (60) et une unité d'actionneur (14) selon la revendication 3, l'unité d'actionneur (14) étant conçue pour agir sur l'ensemble de soupape (60).
  5. Procédé de couplage d'un premier élément connecteur (43) à un second élément connecteur (47) d'un connecteur électrique (50) pour un injecteur (10),
    le premier élément connecteur (43) comprenant
    - un corps de connecteur (44) et
    - un conducteur électrique (45) étant couplé mécaniquement au corps de connecteur (44), étant conçu pour un couplage électrique à une source d'alimentation et ayant une section de conducteur électrique externe (45a) à l'extérieur du corps de connecteur (44), la section de conducteur électrique externe (45a) s'étendant dans une direction longitudinale (D),
    le second élément connecteur (47) comprenant
    - un élément de support (48) se présentant sous la forme d'un cylindre avec un axe longitudinal (A),
    - une première broche électrique (49a) étant couplée de façon rigide à l'élément de support (48) et étant conçue pour un couplage électrique à l'unité d'actionneur (14) de l'injecteur (10), et
    - une seconde broche électrique (49b) étant couplée de façon rigide à l'élément de support (48) et couplée électriquement à la première broche électrique (49a), moyennant quoi la direction longitudinale (D) de la seconde broche électrique (49b) est perpendiculaire à l'axe longitudinal (A) de l'élément de support (48),
    le procédé comprenant les étapes consistant à :
    - prévoir le premier élément connecteur (43) et le second élément connecteur (47),
    - aligner la section de conducteur électrique externe (45a) du premier élément connecteur (43) par rapport à la seconde broche électrique (49b) du second élément connecteur (47) pour obtenir une position définie du premier élément connecteur (43) par rapport au second élément connecteur (47), de telle sorte que la section de conducteur électrique externe (45a) du premier élément connecteur (43) et la seconde broche électrique (49b) du second élément connecteur (47) soient couplées mécaniquement sans tension,
    - coupler de manière rigide la section de conducteur électrique externe (45a) du premier élément connecteur (43) à la seconde broche électrique (49b) du second élément connecteur (47) pour permettre un couplage électrique entre le premier élément connecteur (43) et le second élément connecteur (47).
EP20070011712 2007-06-14 2007-06-14 Connecteur électrique pour injecteur, unité d'actionneur pour actionneur, injecteur et procédé de couplage d'un premier élément connecteur vers un second élément connecteur d'un connecteur électrique pour injecteur Active EP2003329B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200760009507 DE602007009507D1 (de) 2007-06-14 2007-06-14 Elektrischer Verbinder für einen Injektor, Aktuatoreinheit für einen Injektor, Injektor und Verfahren zur Kopplung eines ersten Verbinderelements mit einem zweiten Verbinderelement eines elektrischen Verbinders für einen Injektor
EP20070011712 EP2003329B1 (fr) 2007-06-14 2007-06-14 Connecteur électrique pour injecteur, unité d'actionneur pour actionneur, injecteur et procédé de couplage d'un premier élément connecteur vers un second élément connecteur d'un connecteur électrique pour injecteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070011712 EP2003329B1 (fr) 2007-06-14 2007-06-14 Connecteur électrique pour injecteur, unité d'actionneur pour actionneur, injecteur et procédé de couplage d'un premier élément connecteur vers un second élément connecteur d'un connecteur électrique pour injecteur

Publications (2)

Publication Number Publication Date
EP2003329A1 EP2003329A1 (fr) 2008-12-17
EP2003329B1 true EP2003329B1 (fr) 2010-09-29

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EP20070011712 Active EP2003329B1 (fr) 2007-06-14 2007-06-14 Connecteur électrique pour injecteur, unité d'actionneur pour actionneur, injecteur et procédé de couplage d'un premier élément connecteur vers un second élément connecteur d'un connecteur électrique pour injecteur

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DE (1) DE602007009507D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013012444A1 (de) 2013-07-29 2015-01-29 Astrium Gmbh Ventilanordnung zum Schalten und/oder Regeln eines Medienstroms eines Raumfahrttriebwerks und Raumfahrttriebwerk

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10317148B4 (de) * 2003-04-14 2020-10-01 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102004063292B4 (de) * 2004-12-29 2009-02-12 Continental Automotive Gmbh Stellantrieb zur Betätigung eines Kraftstoffeinspritzventils
DE102005024196B4 (de) 2005-05-25 2013-05-23 Continental Automotive Gmbh Kraftstoffinjektor für eine Brennkraftmaschine sowie Verfahren zur Montage eines derartigen Kraftstoffinjektors

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DE602007009507D1 (de) 2010-11-11
EP2003329A1 (fr) 2008-12-17

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