EP1972778B1 - Passages de câbles pour un module de piézoacteur - Google Patents

Passages de câbles pour un module de piézoacteur Download PDF

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Publication number
EP1972778B1
EP1972778B1 EP20080102596 EP08102596A EP1972778B1 EP 1972778 B1 EP1972778 B1 EP 1972778B1 EP 20080102596 EP20080102596 EP 20080102596 EP 08102596 A EP08102596 A EP 08102596A EP 1972778 B1 EP1972778 B1 EP 1972778B1
Authority
EP
European Patent Office
Prior art keywords
actuator
bushes
piezo
cable
metallic
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.)
Expired - Fee Related
Application number
EP20080102596
Other languages
German (de)
English (en)
Other versions
EP1972778A1 (fr
Inventor
Jochen Winkler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1972778A1 publication Critical patent/EP1972778A1/fr
Application granted granted Critical
Publication of EP1972778B1 publication Critical patent/EP1972778B1/fr
Expired - Fee Related 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
    • 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
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9007—Ceramic materials
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure

Definitions

  • the invention relates to cable bushings for the electrical contacting in a piezoelectric actuator according to the preamble of the main claim, which can be used, for example, in a piezo injector for timely and quantitative metering of fuel in an internal combustion engine.
  • Such a piezo injector essentially consists of a holding body and the piezoelectric actuator arranged in the holding body, which has arranged between an actuator head and an actuator base, stacked piezoelectric elements, each consisting of enclosed with internal electrodes piezoelectric layers.
  • the piezoelectric elements are constructed using a material with a suitable crystal structure (piezoceramic) for the piezoelectric layers so that upon application of an external voltage to the internal electrodes, a mechanical reaction of the piezoelectric elements takes place, which in dependence on the crystal structure and the contact areas of the electrical voltage, a pressure or train in a predeterminable direction.
  • the piezoelectric actuator is connected to a nozzle injector with a nozzle needle, so that by applying a voltage to the piezoelectric elements, a nozzle opening is released or closed.
  • a piezo injector with a via a hydraulic pressure booster acting on a valve member piezoelectric actuator in which the piezoelectric elements of the piezoelectric actuator are arranged in a sleeve-membrane combination.
  • the piezoelectric actuator is positioned within a sleeve and the open ends of the sleeve are closed by welds and there are arranged at one end (actuator head) a steel component and a metal diaphragm, wherein the diaphragm adapts to the stroke of the piezoelectric actuator.
  • a steel component (actuator foot) through the isolated leads, the electrical contacting of the piezoelectric elements of the piezoelectric actuator is made possible.
  • wires may be routed via plug parts as electrical leads to external electrodes on the piezo elements of the piezoelectric actuator.
  • a high-pressure seal to an electrical connection space arranged above the piezoelectric actuator is necessary here, through which the electrical lines for electrical contacting of the piezo injector are led to the outside, for example via a high-pressure-tight, for Example, against pressures of about 2000 bar, glass-melted sealing bush in the actuator base of the piezoelectric actuator can be done.
  • the Glaseinschmelzung is either pressed as a separate component in a support member made of metal or the glass is melted directly into the metal part.
  • the disadvantage of this arrangement is mainly because the press connection can not be made completely tight and in the direct fusion, the metal part is soft, ie. it can not be remunerated.
  • the invention is based on the above-described cable bushings for a piezoelectric actuator with a piezoelectric actuator having arranged between an actuator head and an actuator base arranged piezoelectric elements, wherein in the metallic Aktorfuß isolated running cables for the electrical contacting of the piezoelectric elements are present.
  • the cable bushings sockets each consisting of a solderable or weldable non-conductive material and the outside with the metallic actuator foot and / or inside the metallic conductor of the cable with the leads to the piezo elements are soldered or welded.
  • the sockets are made of a solderable ceramic material, for example, alumina.
  • Such a piezoactuator module may advantageously be part of a piezo injector for an injection system for fuel in an internal combustion engine, as this eliminates the need for the use of expensive special components and the risk of leakage to the environment, d. H. in particular, a discharge of fuel is reduced.
  • simple ceramic mass parts can be used favorably, since the guarantee of absolute tightness and a compensation of surface tolerances by soldering can be achieved;
  • the metal components (actuator foot) can also be tempered.
  • the jacks can be made individually or advantageously be sheared from a long round material for cost reasons.
  • the bushes are cylindrical and can be inserted into a corresponding stepped bore in the metallic Aktorfuß, wherein advantageously a solder ring can be introduced into the stepped bore before introducing the respective socket, which facilitates the soldering during the soldering process.
  • the bushings are tapered and then inserted into a likewise conical bore in the metallic Aktorfuß. Both variants improve the supporting action of the cable glands against the high pressure of a liquid in the surrounding space.
  • FIG. 1 an arrangement 1 is shown with a piezoelectric actuator 2, which can be used for example for Nadelhub Kunststoffung in the injection system for fuel in an internal combustion engine.
  • piezoelectric elements 3 are part of the piezoelectric actuator 2, which still has an actuator base 4 and an actuator head 5 as a metallic tether of steel.
  • a mechanical arrangement located vertically below the actuator head 5 can be actuated such that, for example, a release of a nozzle opening of the injection system can take place.
  • the arrangement 1 with the piezoelectric actuator 2 is installed in an injector body, not shown here, wherein the fuel is guided past the arrangement 1 through the interior of the injector body.
  • This fuel can then be injected for example in a so-called common rail system under the rail pressure mentioned in the introduction or another predetermined pressure in the combustion chamber of an internal combustion engine, not shown here.
  • the leads 6 and 7 are guided by means of cable bushings 10 and 11 through the actuator base 4, wherein here only schematically ceramic bushings 12 and 13 and in each case an electrical coupling 14 and 15 to the not visible here lead wires in the outwardly guided cable 16 can be seen.
  • the leads 6 and 7 are here in the jacks 12 and 13 made of a non-conductive but solderable ceramic material, such as alumina, and at the end of the sockets 12 and 13 with the leads of the outer cable 16 preferably also by soldering to the here exemplary meadow executed electrical couplings 14 and 15 conductively connected.
  • the bush 12 made of the nonconductive but solderable ceramic material is connected via a solder 17 to the actuator base 4 and via a solder 18 the supply line 6 to the corresponding connecting wire of the outer cable 16.
  • the bushings are cylindrical and inserted into a corresponding stepped bore in the metallic actuator base 4, in which case a solder ring can be introduced into the stepped bore before the introduction of the respective bush, which facilitates the soldering in the soldering process.
  • the actuator foot 4 as a metallic support member, the piezoelectric actuator 2 after the FIG. 1 Connect with a holding body, not shown here, thereby ensuring the electrical connection of the piezoelectric actuator 2 and seals it at the same time against the hydraulic fuel pressure of about 2000 bar, in the actuator chamber of the piezoelectric actuator to the arrangement 1 after the FIG. 1 prevails against the environment.
  • the actuator foot 4 as a metallic support member must be quenched before the surface treatment, usually grinding, which is achieved with the inventive introduction of the ceramic jacks 12 and 13, wherein the leads 6 and 7 as control of the piezoelectric elements 3 of the ceramic piezoelectric actuator 2 positionally accurate can be clamped and the seal between the sockets 12 and 13 and between the sockets 12 and 13 and the actuator base 4 via a standard brazing process.

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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 (7)

  1. Passages de câbles (10, 11) pour un module d'actionneur piézoélectrique, comprenant un actionneur piézoélectrique (2) qui présente des éléments piézoélectriques (3) disposés entre une tête d'actionneur (4) et une base d'actionneur (5), avec des câbles (16) et des lignes (6, 7) pour le contact électrique des éléments piézoélectriques (3) s'étendant de manière isolée dans la tête métallique de l'actionneur (4), caractérisés en ce que les passages de câbles (10, 11) présentent en outre des douilles (12, 13) qui se composent à chaque fois d'un matériau non conducteur brasable ou soudable et qui sont brasées ou soudées à l'extérieur à la tête métallique de l'actionneur (4), et en ce que les conducteurs métalliques du câble (16) et les lignes (6, 7) sont brasés ou soudés ensemble à l'intérieur dans les douilles (12, 13).
  2. Passages de câbles selon la revendication 1, caractérisés en ce que les douilles (12, 13) se composent d'un matériau en céramique brasable.
  3. Passages de câbles selon la revendication 2, caractérisés en ce que les douilles (12, 13) se composent d'oxyde d'aluminium.
  4. Passages de câbles selon les revendications 1, 2 ou 3, caractérisés en ce que les douilles (12, 13) sont réalisées sous forme cylindrique et peuvent être insérées dans un alésage étagé correspondant dans la tête métallique de l'actionneur (4).
  5. Passages de câbles selon les revendications 1, 2 ou 3, caractérisés en ce que les douilles (12, 13) sont réalisées sous forme conique et peuvent être insérées dans un alésage étagé correspondant dans la tête métallique de l'actionneur (4).
  6. Procédé de fabrication des passages de câbles selon la revendication 4, caractérisé en ce que l'on introduit dans l'alésage étagé une bague de brasage avant le montage de la douille respective (12, 13).
  7. Utilisation d'un module d'actionneur piézoélectrique avec un passage de câbles (10, 11) selon l'une quelconque des revendications précédentes, caractérisée en ce que le module d'actionneur piézoélectrique fait partie d'un injecteur piézoélectrique pour un système d'injection de carburant dans un moteur à combustion interne.
EP20080102596 2007-03-19 2008-03-13 Passages de câbles pour un module de piézoacteur Expired - Fee Related EP1972778B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710012921 DE102007012921A1 (de) 2007-03-19 2007-03-19 Kabeldurchführungen für ein Piezoaktormodul

Publications (2)

Publication Number Publication Date
EP1972778A1 EP1972778A1 (fr) 2008-09-24
EP1972778B1 true EP1972778B1 (fr) 2009-11-18

Family

ID=39637740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080102596 Expired - Fee Related EP1972778B1 (fr) 2007-03-19 2008-03-13 Passages de câbles pour un module de piézoacteur

Country Status (2)

Country Link
EP (1) EP1972778B1 (fr)
DE (2) DE102007012921A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10139871B4 (de) 2001-08-14 2010-08-26 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE102005039567A1 (de) * 2005-08-22 2007-03-01 Robert Bosch Gmbh Anordnung mit einem Piezoaktor und ein Verfahren zu dessen Herstellung
DE102005039550A1 (de) * 2005-08-22 2007-03-01 Robert Bosch Gmbh Anordnung mit einem Piezoaktor und ein Verfahren zu dessen Herstellung
DE102005039911A1 (de) * 2005-08-24 2007-03-08 Robert Bosch Gmbh Anordnung mit einem Piezoaktor
DE102006018916A1 (de) * 2006-04-24 2007-10-25 Siemens Ag Metallischer Körper

Also Published As

Publication number Publication date
DE502008000186D1 (de) 2009-12-31
EP1972778A1 (fr) 2008-09-24
DE102007012921A1 (de) 2008-09-25

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