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WO2004047191A2 - Metallisation d'actionneur piezo-electrique destinee a une soupape d'injection et procede de fabrication - Google Patents

Metallisation d'actionneur piezo-electrique destinee a une soupape d'injection et procede de fabrication Download PDF

Info

Publication number
WO2004047191A2
WO2004047191A2 PCT/DE2003/003771 DE0303771W WO2004047191A2 WO 2004047191 A2 WO2004047191 A2 WO 2004047191A2 DE 0303771 W DE0303771 W DE 0303771W WO 2004047191 A2 WO2004047191 A2 WO 2004047191A2
Authority
WO
WIPO (PCT)
Prior art keywords
piezo actuator
connection
pin
connecting pin
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.)
Ceased
Application number
PCT/DE2003/003771
Other languages
German (de)
English (en)
Other versions
WO2004047191A3 (fr
Inventor
Roland Albert
Kord Witte
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.)
Siemens AG
Continental Mechatronic Germany GmbH and Co KG
Siemens Corp
Original Assignee
Siemens AG
Volkswagen Mechatronic GmbH and Co KG
Siemens Corp
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 AG, Volkswagen Mechatronic GmbH and Co KG, Siemens Corp filed Critical Siemens AG
Publication of WO2004047191A2 publication Critical patent/WO2004047191A2/fr
Publication of WO2004047191A3 publication Critical patent/WO2004047191A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
    • H10N30/875—Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings

Definitions

  • the invention relates to a piezo actuator contact for an injection valve of an internal combustion engine, with connection pins projecting in parallel from a piezo actuator to which an electrical external connection can be connected, and with a head plate placed on the piezo actuator and the connection pins, the openings having a larger diameter than the connection pins for passage of these pins to form an annular gap between each pin and the wall of the opening in question.
  • the invention also relates to a method for producing such a piezo actuator contact.
  • High-pressure injection systems are increasingly being used for the fuel supply to internal combustion engines.
  • Pump-nozzle-diesel injection systems and accumulator injection systems such as common rail systems (for diesel engines) and HPDI injection systems (for gasoline engines) are known.
  • the fuel is pumped with a high-pressure pump into a pressure accumulator common to all cylinders of the engine, from which the injection valves on the individual cylinders are supplied.
  • the opening and closing of the high-pressure injection valves can be controlled electromagnetically or electrically; In the present case, electrical piezo actuators are used.
  • the nozzle needle of the injection valve can be controlled directly or indirectly by the piezo actuator via a control or servo valve.
  • connection pins With electrical excitation via the connection pins, a deformation of the actuator body is known to occur in a piezo actuator generated in the longitudinal direction; this stroke of the actuator is used to control the valve. Since the piezoceramic is particularly sensitive to chemical environmental influences, it is customary to provide an actuator housing or a head plate, from which, however, the contacts for the electrical external connection of the actuator must be able to be brought out in the most sealing manner possible.
  • an electrical connection device for mounting on parallel projecting connection pins of a piezoelectric module provided with a head plate which comprises a carrier body made of insulating material with bores for pushing the connection pins through.
  • Such an intermediate device is often used to enable further contacting of the piezo actuator via plug connectors, that is, it is intended to produce the transition from the connecting pins (which are unsuitable for a direct plug connection) to suitable contact elements arranged in the carrier body, which then make contact with the mating contact - structure the other connector half are pluggable.
  • connection devices of this type are also intended to protect the piezo actuator from harmful environmental influences such as those prevailing in the vicinity of an internal combustion engine, it is advisable to provide the device with an insulating plastic encapsulation after application to the piezo actuator, which at the same time also provides a connector housing for insertion and securing Forms the seat of a connector half to be connected. Problems may arise during the encapsulation if the injection compound processed at high temperature and high pressure reaches the piezo actuator.
  • the electrical contacting of the piezo actuator in a diesel engine is to be arranged within the cylinder head below the cylinder head cover in the future.
  • the piezo actuator, or its housing and its plug would be permanently flushed with motor oil during operation, which could destroy the piezo actuator in the event of penetration.
  • a glass bushing is arranged in a through opening, in which the respective connecting pin is guided, the glass bushing being arranged sealingly to the guided connecting pin and sealingly to the wall of the opening in question.
  • the glass bushing also provides the electrical insulation of the connection pins against the metallic head plate of the piezo actuator and at least part of the centering of the pins.
  • the sealed piezo actuator contact according to the invention can be produced simply and inexpensively and enables simple assembly, in particular without a difficult one
  • the invention provides an oil-tight contact for a housed piezo actuator, in which the available space is optimally used.
  • the connecting pin can also be melted indirectly with glass instead of directly.
  • the respective connection pin is surrounded in the passage opening by a metal sleeve, the inside diameter of which is dimensioned for tightly enclosing the connection pin, and if the metal sleeve with the connection pin is guided in the glass bushing and introduced in a sealing manner.
  • the metal sleeve with the connecting pin pushed into it can be guided in the center of the glass leadthrough in particular.
  • the piezo actuator contact according to the invention can be easily combined with an electrical connection device known per se for further contacting of the connection pins.
  • a part of the piezo actuator contact can be provided together with the connecting device in the usual way with a plug injection made of plastic.
  • a method according to the invention for producing a piezo actuator contact consists in inserting a connecting pin into a passage opening and in that the sealing pin is melted through a glass cover in the passage opening.
  • the glass leadthrough can also be introduced in a sealing manner, by gluing, for example by means of an adhesive layer, to the connecting pin, to the wall of the opening in question or to both.
  • FIG. 1 in a partially cut-open representation, a piezo actuator contact according to the invention with a connecting device attached and with plug gating,
  • Figure 2 is an enlargement of the sealing area in a section along the line B-B in Figure 1.
  • FIG. 1 shows the piezo actuator contact according to the invention with the connection pins 1 and a head plate 3 placed on the pins 1 and on the top side of the piezo actuator or the piezo actuator housing 2.
  • a connecting device with a contact body and a carrier body 4 made of insulating material is also shown.
  • Metallic, angled contact members 5 are cast into the carrier body 4. The outer free ends of the contact members 5 protrude laterally, they serve to slide on the plug contacts of external leads (not shown).
  • the connection pins 1 are typically welded to the associated contact element 5.
  • a plug injection 6 made of plastic material, which is achieved by overmolding the carrier body 4 and the upper part 7 of the (metallic) piezo actuator housing 2 while maintaining the accessibility of the contact members 5.
  • the through openings 8 in the head plate 3 for the connecting pins 1 passing through them can also be seen in FIG. 1.
  • the actuator space 9 located below the head plate 3 the piezo actuator (not shown) is used to seal permanently against the penetration of liquid media by means of the sealing area 10 described in more detail below (see FIG. 2).
  • FIG. 2 shows an enlarged view of the sealing area 10 shown in section along the line B-B in FIG. 1.
  • the openings 8 are each provided over their entire length with a glass bushing 12 into which the respective connector pin 1 is melted. This can be carried out in a process-reliable manner by means of a known method, for example by heating a glass granulate. In contrast to separate small sealing elements, the possibility of damaging the seal during assembly is very low.
  • the glass bushing 12 also takes over the centering and the electrical insulation of the connecting pin 1 (diameter: approx. 2 mm) in the opening 8 of the head plate 3.
  • FIG. 2 for example only for the left connecting pin 1, a variant is also shown in which the connecting pin 1 is first inserted into a metal sleeve 13 which tightly surrounds the pin 1. The metal sleeve 13 is then melted into the opening 8 with the connecting pin 1.
  • a plastic molded part 4 of the further contact can advantageously take over the further centering of the pin 1.
  • this molded part 4 offers additional protection for the glass leadthrough 12 located underneath against damage or loss of sealing in subsequent manufacturing processes, for example in the event of a final plastic encapsulation.
  • the molded parts 4 for the different openings 8 are typically connected to one another in one piece, in particular which forms the carrier body 4 of the further contact.
  • the piezo actuator can also easily have more than two contacts or pins 1.
  • the top plate 3 is often mounted in connection with a tube spring known per se for the piezo actuator.
  • the piezo actuator usually designed as a multi-layer piezo stack, can then be introduced into a tubular spring which is welded to a base plate.
  • the tubular spring is connected to the head plate 3 in such a way that it is under a certain pretension, which acts as the desired restoring force for the piezo actuator.
  • This arrangement can in the following in the piezo actuator housing 2, cf. Figure 1, are used.

Landscapes

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

Abstract

Selon l'invention, une plaque de recouvrement présentant des ouvertures (8) destinées au passage des broches (1) est appliquée sur l'actionneur piézo-électrique et sur les broches de connexion (1). L'invention vise à créer une étanchéification durable, notamment étanche à l'huile, entre l'actionneur piézo-électrique et la métallisation extérieure. A cet effet, chaque ouverture de passage (8) comporte un passage en verre (12) recevant la broche de connexion (1) correspondante de façon centrée, et dans lequel la broche (1) est fondue de façon étanche par rapport à tous les côtés de la paroi de l'ouverture (8) correspondante.
PCT/DE2003/003771 2002-11-19 2003-11-13 Metallisation d'actionneur piezo-electrique destinee a une soupape d'injection et procede de fabrication Ceased WO2004047191A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10253956A DE10253956A1 (de) 2002-11-19 2002-11-19 Piezoaktorkontaktierung für Einspritzventil und Verfahren zu dessen Herstellung
DE10253956.1 2002-11-19

Publications (2)

Publication Number Publication Date
WO2004047191A2 true WO2004047191A2 (fr) 2004-06-03
WO2004047191A3 WO2004047191A3 (fr) 2004-09-23

Family

ID=32318545

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/003771 Ceased WO2004047191A2 (fr) 2002-11-19 2003-11-13 Metallisation d'actionneur piezo-electrique destinee a une soupape d'injection et procede de fabrication

Country Status (2)

Country Link
DE (1) DE10253956A1 (fr)
WO (1) WO2004047191A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1577960A1 (fr) * 2004-03-17 2005-09-21 Robert Bosch GmbH Module d'actionneur
WO2005038940A3 (fr) * 2003-10-14 2005-11-03 Siemens Ag Manchon de reception pour un actionneur piezo-electrique
WO2005112142A1 (fr) * 2004-05-14 2005-11-24 Siemens Aktiengesellschaft Module plaque superieure pour un actionneur et procede de production d'un actionneur
EP1758237A1 (fr) * 2005-08-22 2007-02-28 Robert Bosch Gmbh Dispositif comprenant un actionneur piézoélectrique et un procédé de sa fabrication
WO2007033909A1 (fr) * 2005-09-22 2007-03-29 Robert Bosch Gmbh Ensemble comportant un actionneur piezoelectrique et procede de fabrication dudit ensemble
WO2007036393A1 (fr) * 2005-09-27 2007-04-05 Robert Bosch Gmbh Soupape d'injection de carburant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042353B4 (de) * 2004-08-20 2008-10-09 Continental Automotive Gmbh Abdichtungsanordnung eines Piezoaktors für ein Kraftstoffeinspritzventil einer Brennkraftmaschine
DE102005015114B4 (de) * 2005-04-01 2012-10-31 Continental Automotive Gmbh Vorrichtung zum elektrischen Kontaktieren einer Aktoreinheit und Ventil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471256A (en) * 1982-06-14 1984-09-11 Nippon Soken, Inc. Piezoelectric actuator, and valve apparatus having actuator
EP0319038B1 (fr) * 1987-12-02 1994-07-13 Nec Corporation Structure pour sceller un élément électrostrictif
JP2692396B2 (ja) * 1991-02-22 1997-12-17 日本電気株式会社 圧電アクチュエータおよびその製造方法
DE19512339B4 (de) * 1995-04-01 2010-06-10 Robert Bosch Gmbh Elektromagnetisch betätigbares Brennstoffeinspritzventil
DE19715487C2 (de) * 1997-04-14 2002-06-13 Siemens Ag Piezoelektrischer Aktor mit einem Hohlprofil
DE19940347B4 (de) * 1999-08-25 2006-06-08 Siemens Ag Elektrische Verbindungsvorrichtung zum Aufsetzen auf Anschlußstifte eines elektrischen Bausteins

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005038940A3 (fr) * 2003-10-14 2005-11-03 Siemens Ag Manchon de reception pour un actionneur piezo-electrique
US7750539B2 (en) 2003-10-14 2010-07-06 Continental Automotive Gmbh Reception bush for a piezoactuator
EP1577960A1 (fr) * 2004-03-17 2005-09-21 Robert Bosch GmbH Module d'actionneur
WO2005112142A1 (fr) * 2004-05-14 2005-11-24 Siemens Aktiengesellschaft Module plaque superieure pour un actionneur et procede de production d'un actionneur
US7646139B2 (en) 2004-05-14 2010-01-12 Siemens Aktiengesellschaft Head plate assembly for an actuator and method for producing an actuator
EP1758237A1 (fr) * 2005-08-22 2007-02-28 Robert Bosch Gmbh Dispositif comprenant un actionneur piézoélectrique et un procédé de sa fabrication
WO2007033909A1 (fr) * 2005-09-22 2007-03-29 Robert Bosch Gmbh Ensemble comportant un actionneur piezoelectrique et procede de fabrication dudit ensemble
WO2007036393A1 (fr) * 2005-09-27 2007-04-05 Robert Bosch Gmbh Soupape d'injection de carburant

Also Published As

Publication number Publication date
DE10253956A1 (de) 2004-06-24
WO2004047191A3 (fr) 2004-09-23

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