EP2113652A1 - Module d'actionneur piézoélectrique - Google Patents

Module d'actionneur piézoélectrique Download PDF

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Publication number
EP2113652A1
EP2113652A1 EP08105976A EP08105976A EP2113652A1 EP 2113652 A1 EP2113652 A1 EP 2113652A1 EP 08105976 A EP08105976 A EP 08105976A EP 08105976 A EP08105976 A EP 08105976A EP 2113652 A1 EP2113652 A1 EP 2113652A1
Authority
EP
European Patent Office
Prior art keywords
actuator module
actuator
metallic coating
module according
fuel injection
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.)
Granted
Application number
EP08105976A
Other languages
German (de)
English (en)
Other versions
EP2113652B1 (fr
Inventor
Rudolf Heinz
Udo Schaich
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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2113652A1 publication Critical patent/EP2113652A1/fr
Application granted granted Critical
Publication of EP2113652B1 publication Critical patent/EP2113652B1/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
    • F02M51/06—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
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M63/0057—Means for avoiding fuel contact with valve actuator, e.g. isolating actuators by using bellows or diaphragms
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to a piezoelectric actuator module for a fuel injection valve and a fuel injection valve with such a piezoelectric actuator module. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • a fuel injection valve with a piezoelectric actuator is known.
  • the known fuel injection valve is designed as an injector with direct needle control. Since the piezoelectric actuator is arranged in a space of the fuel injection valve, which is traversed during operation of high-pressure fuel, a suitable sealing of the actuator to media, especially against diesel fuel contained in the water and the usual fuel additives required.
  • the piezoelectric actuator module according to the invention with the features of claim 1 and the fuel injection valve according to the invention with the features of claim 10 have the advantage that a reliable protection of the actuator body is ensured, which can be realized with relatively low cost.
  • the piezoelectric actuator module can be arranged in a space that is filled in operation with high-pressure fuel.
  • the pressure of the fuel may be, for example, 250 MPa (2500 bar).
  • the metallic coating of the shrink tube ensures a diffusion-proof seal.
  • the inner protective layer which is provided between the actuator body and the shrink tubing in the intermediate space, is not necessarily sufficiently resistant to diffusion of fuel and its constituents, and optionally other substances. The metallic coating, however, already the diffusion resistance of the seal is guaranteed, so that there is a greater freedom in the choice of the material for the inner protective layer.
  • the inner protective layer can advantageously be applied to the outer surface of the actuator body prior to assembly of the shrink tubing. This can be a costly filling of the gap, which should be free of air bubbles, omitted. Thus, the production of the fuel injection valve can be further simplified. In addition, the gap can be made relatively small, so that there is an optimized space of the piezoelectric actuator module.
  • a metallic coating is provided on an outer side of the shrink tube and / or that a metallic coating is provided on an inner side of the shrink tube.
  • the provided on the outside of the shrink tube metallic coating can also be done after the application of the shrink tube and possibly also after the shrinkage of the shrink tube.
  • no deformation of the metallic coating occurs during manufacture, so that the risk of cracking in the metallic coating is avoided.
  • the metallic coating provided on the outside is reliably protected against an actuator connection of the piezoelectric actuator or inner electrode layers guided on the outside of the actuator.
  • the application of the metallic coating on the inside of the shrink tube has the advantage that the metallic coating is protected against mechanical damage from the outside.
  • the inner protective layer is formed on the basis of an elastomer.
  • the inner protective layer supports the shrink tube from the inside, so that even at high pressure fluctuations, for example, when starting the fuel injector, excessive radial expansion of the shrink tube is prevented, so that reduces stresses in the metallic coating and thus the formation of cracks is prevented.
  • the heat-shrinkable tube is designed to be wavy at least in sections on at least one side surface on which the metallic coating is provided. Due to the wave-shaped configuration of the metal layer, the stresses occurring during an axial expansion of the shrink tube are reduced, so that the formation of cracks in the metallic coating is prevented. It is also advantageous that the shrink tube at least partially corrugated tube is designed. As a result, the elasticity of the shrink tubing, in particular in the axial direction, can be favorably influenced. In addition, such a configuration is advantageous if both the inside and the outside of the shrink tube are each provided with a metallic coating.
  • the heat-shrinkable tube already fits tightly against the transition piece in an unshrunked initial state, so that the intermediate space between the actuator body and the shrink-on tube is predetermined to be relatively small.
  • the mechanical stress of an already applied prior to shrinking on the shrink tubing metal layer can be reduced.
  • shrinking the shrink tube then only a relatively small deformation takes place, so that the metal layer is only slightly deformed. Cracks or flaking of the metal layer are prevented.
  • the sealing function can be ensured by the shrink tube is so widened that it already fits very closely over the transition pieces, that is, actuator head and actuator foot of the actuator module.
  • the metal layer can be made very thin, for example, with a layer thickness that is smaller than 1 micron. This is possible because the metallic coating rests on the carrier serving as a shrink tube, whereby the mechanical stability is ensured.
  • the shrink tubing can be waved on one side inside, on one side outside or on both sides. It is advantageous that a wave structure exists at least on the side on which the metal layer is applied.
  • the metallic coating is covered with a lacquer layer.
  • a mechanical and chemical protection of the metallic coating can be achieved.
  • the lacquer layer can serve as an insulating layer with respect to the metallic coating. This is especially advantageous in the case of an inner coating in order to prevent a short circuit on the actuator body prevent.
  • Fig. 1 shows a fuel injection valve 1 in a partial, schematic sectional view.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • An actuator module 2 of the fuel injection valve 1 of the first embodiment of the invention is particularly suitable for such an injector.
  • the fuel injection valve 1 according to the invention and the Actuator module 2 according to the invention are also suitable for other applications.
  • the fuel injection valve 1 has a nozzle body 3, which is connected to a valve housing, not shown. Within the nozzle body 3, a valve needle 4 is provided. A valve closing body 5 of the valve needle 4 cooperates with a valve seat surface 6 formed inside the nozzle body 3 to form a sealing seat.
  • the actuator module 2 serves to actuate the valve needle 5, as illustrated by the double arrow 7. Upon actuation of the valve needle 4, the valve closing body 5 is lifted out of its seat, wherein the sealing seat formed between the valve closing body 5 and the valve seat surface 6 opens and fuel is sprayed through a nozzle opening 8.
  • the piezoelectric actuator module 2 has an actuator body 10, to which transition pieces 11, 12 are added.
  • the transition piece 11 is designed as an actuator foot.
  • the transition piece 12 is designed as an actuator head.
  • the piezoelectric actuator module 2 a shrink tube 13 which is connected at one end 14 with the transition piece 11 and at a further end 15 with the transition piece 12.
  • the connection can be made directly or indirectly.
  • the shrink tube 13 may be connected to the transition pieces 11, 12 by gluing. Other possibilities such as vulcanization or the like are also possible.
  • the connection can be made via sleeves connected to the transition pieces 11, 12 by welding.
  • a gap between the actuator body 10 and the shrink tube 13 is filled with an inner protective layer 16, wherein the inner protective layer 16 is preferably formed on the basis of an elastomer.
  • the inner protective layer 16 can be applied to an outer surface 17 of the actuator body 10 before the shrinking tube 13 is mounted. Subsequently, the shrink tube 13 mounted and shrunk. After shrinking, the gap between the actuator body 10 and the shrink tube 13 is completely filled with the inner protective layer 16. In contrast to a rigid sleeve thus results in the advantage that a relatively complex process step for bubble-free filling of the gap can be omitted.
  • the shrink tube 13 has side surfaces 18, 19, namely an outer side 18 and an inner side 19, on.
  • the inner side 19 of the shrink tube 13 is coated with a layer system 20, which may comprise one or more layers.
  • the outer side 18 of the shrink tube 13 may additionally or alternatively be coated with a corresponding layer system.
  • Fig. 2 shows the in Fig. 1 labeled II section of the actuator module 2 of the fuel injection valve 1 according to the first embodiment of the invention.
  • the layer system 20 has a metallic coating 21 and a lacquer layer 22 in this exemplary embodiment.
  • the heat-shrinkable tube 13 is designed as a bellows-shaped at least in sections, wherein this configuration can already be predetermined before shrinking or can be achieved during the shrinking process.
  • the metallic coating 21 is applied, which can be configured very thin.
  • the metallic coating serves as a diffusion barrier and ensures a diffusion-tight seal of the actuator body 10 with respect to the environment.
  • the mechanical stability of the metallic coating 21 is ensured by the heat shrink tube 13 serving as a support.
  • the heat-shrinkable tube 13 is preferably mounted already configured relatively narrow, so that mechanical stresses in the metallic coating 21 during shrinkage are as low as possible to the formation of cracks, in particular Microcracks to prevent in the metallic coating 21.
  • the metallic coating 21 is electrically insulated from the inner protective layer 16 and the actuator body 10 by the lacquer layer 22. This prevents a short circuit on the actuator body 10, in particular between external electrode connections or electrode layers.
  • a certain elasticity of the metallic coating 21 is ensured by the bellows-shaped configuration of the shrink tube 13, so that the occurring mechanical stresses in the metallic coating 21 are reduced. Further, the elasticity of the shrink tube 13 can be further improved by the bellows-shaped configuration of the shrink tube 13.
  • Fig. 3 shows the in Fig. 1 labeled II section of an actuator module 2 of a fuel injection valve 1 according to a second embodiment of the invention.
  • the shrink tube 13 is coated on the inside 19 with the layer system 20.
  • the layer system 20 has at least the metallic coating 21 and optionally also the lacquer layer 22.
  • the heat-shrinkable tube 13 on the inside 19 is at least partially undulated.
  • the shrink tube 13 is not wavy on its outer side 18, but designed substantially cylinder jacket-shaped.
  • the inner side 19 of the shrink tube 13 is designed like a cylinder jacket and thereby adapted to the outer geometry of the transition piece 12.
  • the connection between the shrink tube 13 and the transition piece 12 takes place in this embodiment by means of an adhesive 23rd
  • Fig. 4 shows the in Fig. 3 shown section of an actuator module 2 of a fuel injection valve 1 according to a third embodiment of the invention.
  • the inner side 19 of the shrink tube 13 is cylinder jacket-shaped configured, wherein on the inside 19 no layer system is provided.
  • the outer side 18 of the shrink tube 13 is at least partially configured wave-shaped.
  • the outer side 18 in this exemplary embodiment is embodied in an area of the transition piece 12, at least essentially in the shape of a cylinder jacket, since no mechanical stresses occur in the heat shrink tube 13 and thus also in the layer system 20 during operation of the fuel injection valve 1.
  • the layer system 20 is applied to the outer side 18 and has at least the metallic coating 21.
  • the metallic coating 21 on the outside 18 can also take place after shrinking the shrinking tube 13 and / or bonding the shrinking tube 13 by means of the adhesive 23 to the transition piece 12. As a result, mechanical stresses in the metallic coating 21, which can occur during the assembly of the shrink tubing 13, in particular during shrinkage, can be avoided from the outset.
  • the metallic coating 21 can also be provided with a lacquer layer 22.
  • the layer system 20 has at least the metallic coating 21.
  • the metallic coating 21 may also consist of several partial layers.
  • the substantially metallic coating 21 may also have non-metallic constituents.
  • the actuator module 2 of the fuel injection valve 1 sealing of the actuator body 10 with respect to surrounding media, in particular diesel fuel, is thus ensured.
  • the seal takes place both in the radial and in the axial direction.
  • a diffusion of media through the coated shrink tube 13 is prevented.
  • stroke expansions of the actuator body 10 can be ensured or an impairment of the stroke can be reduced.
  • thermal expansions of the actuator body 10 and the inner protective layer 16 in the operation of the fuel injection valve, which occur in the radial direction guaranteed.
  • compression of the actuator body 10 and the inner protective layer 16 are also possible.
  • the inner protective layer 16 is preferably designed to be insulating.
  • the layer system 20 with the lacquer layer 22 can also be done in an inexpensive manner additional security against short circuits.
  • the lacquer layer 22 can also ensure a certain protection against mechanical damage to the metallic coating 21.
  • the heat-shrinkable tube 13 can be largely shaped as desired with regard to the configuration of a wave structure on the outside 18 and / or on the inside 19. Specifically, the wavelength and the amplitude of such a wave structure can be adjusted according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20080105976 2008-05-02 2008-12-12 Module d'actionneur piézoélectrique Not-in-force EP2113652B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810001525 DE102008001525A1 (de) 2008-05-02 2008-05-02 Piezoelektrisches Aktormodul

Publications (2)

Publication Number Publication Date
EP2113652A1 true EP2113652A1 (fr) 2009-11-04
EP2113652B1 EP2113652B1 (fr) 2011-06-29

Family

ID=41017075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080105976 Not-in-force EP2113652B1 (fr) 2008-05-02 2008-12-12 Module d'actionneur piézoélectrique

Country Status (2)

Country Link
EP (1) EP2113652B1 (fr)
DE (1) DE102008001525A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012079988A1 (fr) * 2010-12-15 2012-06-21 Epcos Ag Piézoactionneur doté d'une protection contre les influences de l'environnement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1174615A2 (fr) 2000-07-18 2002-01-23 Delphi Technologies, Inc. Injecteur de combustible
WO2007093921A2 (fr) * 2006-02-14 2007-08-23 Delphi Technologies, Inc. Revêtements barriere destines a un dispositif piezoelectrique
WO2007102088A2 (fr) 2006-03-06 2007-09-13 Delphi Technologies, Inc. Systeme d'enveloppe pour composant electrique
DE102006025820A1 (de) * 2006-04-28 2007-10-31 Daimlerchrysler Ag Piezoelektrischer Aktor mit einer Ummantelung aus einem Verbundwerkstoff
EP1854996A1 (fr) 2006-05-08 2007-11-14 Siemens Aktiengesellschaft Actionneur piézo-électrique, procédé de fabrication d'un actionneur piézo-électrique et système d'injection comportant cet actionneur piézo-électrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1174615A2 (fr) 2000-07-18 2002-01-23 Delphi Technologies, Inc. Injecteur de combustible
WO2007093921A2 (fr) * 2006-02-14 2007-08-23 Delphi Technologies, Inc. Revêtements barriere destines a un dispositif piezoelectrique
WO2007102088A2 (fr) 2006-03-06 2007-09-13 Delphi Technologies, Inc. Systeme d'enveloppe pour composant electrique
DE102006025820A1 (de) * 2006-04-28 2007-10-31 Daimlerchrysler Ag Piezoelektrischer Aktor mit einer Ummantelung aus einem Verbundwerkstoff
EP1854996A1 (fr) 2006-05-08 2007-11-14 Siemens Aktiengesellschaft Actionneur piézo-électrique, procédé de fabrication d'un actionneur piézo-électrique et système d'injection comportant cet actionneur piézo-électrique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012079988A1 (fr) * 2010-12-15 2012-06-21 Epcos Ag Piézoactionneur doté d'une protection contre les influences de l'environnement
JP2014504010A (ja) * 2010-12-15 2014-02-13 エプコス アーゲー 環境の影響から保護されたピエゾアクチュエータ

Also Published As

Publication number Publication date
EP2113652B1 (fr) 2011-06-29
DE102008001525A1 (de) 2009-11-05

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