EP2038541B1 - Dispositif d'étanchéité d'un actionneur piézoélectrique pour une soupape d'injection de carburant d'un moteur à combustion interne - Google Patents

Dispositif d'étanchéité d'un actionneur piézoélectrique pour une soupape d'injection de carburant d'un moteur à combustion interne Download PDF

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Publication number
EP2038541B1
EP2038541B1 EP07765689A EP07765689A EP2038541B1 EP 2038541 B1 EP2038541 B1 EP 2038541B1 EP 07765689 A EP07765689 A EP 07765689A EP 07765689 A EP07765689 A EP 07765689A EP 2038541 B1 EP2038541 B1 EP 2038541B1
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EP
European Patent Office
Prior art keywords
sealing
sealing element
arrangement
arrangement according
head
Prior art date
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Active
Application number
EP07765689A
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German (de)
English (en)
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EP2038541A1 (fr
Inventor
Marcus Unruh
Claus Zumstrull
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Continental Automotive GmbH
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Continental Automotive GmbH
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Publication of EP2038541A1 publication Critical patent/EP2038541A1/fr
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    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic 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
    • 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

Definitions

  • the present invention relates to a sealing arrangement according to the preamble of claim 1.
  • a seal is realized by means of an elastomeric sealing disc, from which dome-like protruding from the disk plane sealing element portions sealingly abut peripheral surfaces of terminal pin portions, which protrude from the openings of the patch on the piezoelectric actuator top plate.
  • the contact force for providing the sealing effect is provided by a resilient bias of the material of the elastomeric sealing disc.
  • the sealing arrangement comprises a sealing unit in which individual sealing material sections do not form a contiguous material area but instead form an annularly connected area for axial sealing and two separate areas for radial sealing of the connecting pins.
  • a good sealing between the individual sealing material sections on the one hand and the material of the carrier on the other hand is necessarily required (and problematic) in these embodiments.
  • sealing contact of the sealing element is provided on the peripheral surfaces of the connecting pins within the openings and located within the openings sealing element sections are radially compressed in the openings.
  • the sealing contact of the sealing element both on the peripheral surfaces of the pins and on the head assembly a reliable seal is made possible.
  • the former attachment or sealing is hereinafter also referred to as “radial seal” and the second-named system or seal as “axial seal”.
  • the radial seal is particularly reliable due to the radial compression of the sealing element sections between the pins of the piezoelectric actuator and the openings and can be maintained for longer periods.
  • the sealing element sections are advantageously secured against escaping from the openings by sections of the contact assembly extending axially to just above the sealing element sections or up to the sealing element sections.
  • the sealing element sections are formed as sealing beads.
  • the sealing beads have at least approximately the shape of O-rings. Deviating from this, however, other shapes or Dichtwulstqueritese are possible.
  • the pins in the region of the radial seal and the respective adjacent inner surfaces of the openings have a cylindrical shape, it is to achieve a uniform contact force (both on the pin as well a rotationally symmetrical sealing bead (eg O-ring-like) is preferred on the inner surface of the opening).
  • the Dichtwulste can z. B. each form an end of a projecting into the opening "sealing element dome".
  • z. B. have a cross-section, which tapers starting from the opening edge in the direction of the head assembly, z. B. by conical and / or stepped inner surface areas of the opening.
  • the sealing element can, with regard to an optimal seal on the connecting pins (radial seal) and on the head assembly (axial seal) z.
  • B. be formed of an elastomer.
  • the sealing element of polyurethane, an elastomer of the type "FKM” such. As Viton (trade name), or an elastomer of the type "NBR” etc. may be formed.
  • the sealing element material is particularly well electrically insulating.
  • no special precautions are to be taken against inadequate electrical insulation of the terminal pins in the case where the head assembly electrically conducts.
  • the latter is usually the case since the piezo housing arrangement as a whole and thus also the head arrangement are usually made of metallic materials.
  • the material of the sealing element is not sufficiently electrically isolated, it can be provided that at least in the areas of the system of the sealing element on the head assembly, the sealing element material and / or the head assembly is electrically isolated, for. B. is provided with an insulating layer or an insulating part.
  • a preferred use of the sealing arrangement according to the invention results for the piezoelectric actuator of a fuel injector of an internal combustion engine, in which the fuel injector and at least one further component of a fuel injection device are arranged substantially completely within an engine block assembly of the internal combustion engine.
  • engine block assembly here refers to the entirety of engine lubricating oil-containing components, ie the "engine block” in the strict sense and attachments (such as a cylinder head cover, etc.) in which the lubricating oil is pumped or lubricated or (back) out ,
  • engine block in the strict sense and attachments (such as a cylinder head cover, etc.) in which the lubricating oil is pumped or lubricated or (back) out
  • harmful media such as oil and / or fuel into the interior of an injector housing. This problem arises in particular for common rail diesel engines with lying within the cylinder head cover injection components.
  • the sealing element is formed from a material having a high gas permeability.
  • a silicone material, in particular fluorosilicon material may be selected as the material (eg elastomers of the "LSR" or "FVMQ” type).
  • LSR low-density polystyrene
  • FVMQ fluorosilicon material
  • the latter materials allow even with a comparatively large thickness of the sealing element, a high permeation rate to gaseous substances such. For example, air. This property is advantageous for the durability or service life of the piezoelectric ceramic of the piezoelectric actuator.
  • a compact design of the sealing element results, for example, when the sealing element is formed substantially disc-like overall, however, to achieve the radial seal sealing element portions are provided, extending from the disk plane out in the axial direction extend into the openings (and enclose the pins).
  • the end face of the sealing element facing the head arrangement essentially follows the contour of the head arrangement.
  • the sealing element for example formed in one piece like a disk
  • the sealing element rests circumferentially at least annularly on the circumference of the head arrangement (axial seal).
  • the head arrangement can comprise a head plate in which the openings of the head arrangement are provided for the passage of the connection pins.
  • the piezoelectric actuator is accommodated in an actuator chamber, which is formed by a sleeve-like actuator housing and a top plate and a bottom plate, which are arranged at both ends of this actuator housing.
  • the top plate can in this case be used at one axial end of the actuator housing and welded thereto, whereas in this case the bottom plate is guided axially displaceable in the actuator housing.
  • the piezoelectric actuator may be held under axial pressure bias in an axially elongated tube spring, which is welded to its two ends to the top plate and the bottom plate.
  • the bottom plate may be formed as part of an operative connection to an actuator of a fuel injection valve operative connection. In this area, the sealing of the actuator chamber can be done in a conventional manner by a welded between the inner wall of the actuator housing and the bottom plate membrane.
  • the sealing element for example, at least in an annular surrounding the terminal pins area be pressed axially towards the head assembly, z. B. against the axial end of the actuator housing mentioned above.
  • Such compression in the region of the axial seal can be achieved, for example, by exerting axial pressure from the z. B. arranged at one end of an injector arranged contact assembly for electrical connection of the injector.
  • the contact assembly presses the sealing element at least in sections against the head assembly. These thus effectively clamped between the contact assembly and the head assembly sealing element portions can then accomplish the Axialabdichtung.
  • the pressing of the sealing element against the head assembly takes place in a particularly well-defined manner, if the contact assembly is provided for this purpose with one or more projections facing the sealing element, which lead to the desired compression of the corresponding sealing element sections during assembly of the fuel injector.
  • the contact assembly bears substantially over the entire surface of the sealing element and thus exerts particularly uniform axial pressure on the sealing element.
  • An axial pressure in particular also in the region of the sealing material sections provided for radial sealing, can advantageously improve this radial seal.
  • the attached to the head assembly contact assembly for electrical connection the pins to a connector secures the sealing portions against exiting the openings.
  • a simple assembly of the contact assembly in which the above-described compression of the sealing element can be ensured, results when the contact assembly encompasses a peripheral region of the head assembly and is held at this peripheral region by a positive connection.
  • This form-locking connection can be provided in particular as a latching connection in such a way that it is latched to the head assembly by pressing the contact assembly.
  • the locking connection can z. B. extending annularly on the circumference or be provided by a plurality of distributed over the circumference, separate latching areas.
  • a particularly durable and sealed Axialabdichtung results when the locking connection is subsequently fixed in a final plastic extrusion. The shrinkage of the plastic material increases the contact pressure and thus the clamping force of the sealing element.
  • an insulating disc provided with openings for the passage of the connection pins of electrically insulating material is arranged between the sealing element and the head arrangement.
  • the advantageous Aktorraumvolumen can already be increased by the presence of such an insulating, by more or less large gap between such insulating and adjacent components such.
  • B. top plate and sealing element can be provided. Such gaps are often inevitable in practice.
  • the insulating disk can also have further cavities creating recesses. Such recesses may also be suitably provided for promoting gas exchange between the axially opposite sides of the insulating washer. If, in addition, cavities are present or provided above or below the insulating washer, recesses passing through the insulating washer create a larger coherent cavity space, which has an advantageous effect on the durability of the piezoactuator.
  • this z. B. with at least one passage opening (eg., Bore) are provided.
  • the insulating can be particularly economical z. B. made of plastic as an injection molded part. With such an insulating disc results in an increased freedom in the choice of material for the sealing element, since the electric current is forced to take a "detour", depending on the geometric design of the insulating.
  • Fig. 1 1 illustrates an exemplary embodiment of a sealing arrangement of a piezoelectric actuator 12 in a piezoelectric drive, designated as a whole by 10.
  • Fig. 2 shows the piezo drive 10, which is provided for actuating the injection valve of a fuel injector of an internal combustion engine (eg diesel injector of a "common rail" injection system).
  • a fuel injector of an internal combustion engine eg diesel injector of a "common rail" injection system.
  • the illustrated piezoelectric drive 10 forms together with a in Fig. 1 arranged below the piezoelectric actuator 10, but not shown in the figure injector the fuel injector.
  • Fig. 1 in which, for the sake of simplicity of illustration, only one (left) half of the axial section (axial direction A) is shown, one of two protruding from the piezoelectric actuator 12 pins 14 and a patch on the piezoelectric actuator head assembly, which in the illustrated embodiment of a metallic Head plate 16 and a sleeve-like actuator housing 18 and is provided with openings 20 for the passage of the connecting pins 14.
  • the piezo drive 10 comprises the piezoactuator 12, which is essentially formed from a piezoelectric element stack and elongated in the axial direction A, the axial extent of which can be changed in a controlled manner after application of a control voltage via the metallic connection pins 14.
  • the contact assembly 22 is constructed as a so-called contact tongue carrier, to its basic structure by way of example to the DE 198 44 743 C1 is referenced.
  • the connecting pins 14 of the piezoactuator 12 pass upwardly through the openings 20 of the head plate 16 in the form of axial bores, so that connecting pin sections project axially out of the openings 20.
  • Upper ends of the terminal pins 14 are welded to metallic welding tabs 26, which in turn are integrally connected to the contact tongues of the contact assembly 22.
  • a tube spring 28 is arranged, in which the piezoelectric actuator 12 is held under axial pressure bias.
  • the tube spring 28 is welded at its lower end (not shown) with an axially movable in the actuator housing 18 guided bottom plate, whereas the opposite, upper end of the tube spring 28 is welded to the periphery of the top plate 16.
  • the sealing of the actuator space located under the top plate 16 relative to the region of the contact assembly 22, or equivalently, the sealing of the upper end of the sleeve-shaped actuator housing 18 is accomplished by the sealing arrangement described in more detail below.
  • the axial seal is provided annularly circumferentially at the upper end of the actuator housing 18.
  • the actuator housing 18 has an annular groove, in which a peripheral edge of the sealing washer 30 sealingly engages.
  • the radial seal provided between the sealing disk 30 and the connecting pins 14 is likewise realized by the elastomer sealing disk 30, which engages in compression-sealing manner on the contact bushings (openings 20).
  • the sealing disc 30 In the region of the passage of the connecting pins 14, the sealing disc 30 axially dome-like in the openings 20 projecting sealing disc sections whose in Fig. 1 lower ends are formed as O-ring-like sealing beads 32.
  • the sealing engagement of the sealing washer 30 on the peripheral surfaces of the connecting pins 14 is provided within the openings 20, wherein the sealing beads 32 located within the openings 20 are radially compressed in the openings 20. At this point, the elastomer is therefore not stretched, but pressed between the pins 14 and the top plate bore.
  • the radial seal is thus based on a predetermined by the geometry in this area pressure load of the elastomeric material in the region of the sealing beads 32.
  • the sealing effect can be ensured with a comparatively large contact force reliable and stable over longer periods of time.
  • the Axialabdichtung is accomplished particularly reliable in the illustrated embodiment by an axial compression of the sealing washer 30 toward the head assembly 16, 18.
  • the plastic material of the contact assembly 22 presses with its underside on the outer circumference of the sealing disc 30 so that it is pressed circumferentially against the end face of the actuator housing 18. Also at this point can thus be ensured due to the elasticity of the sealing material used permanently a sealing effect.
  • the contact assembly 22 engages around a peripheral region of the actuator housing 18 and is held after being pressed by a latching connection 34 provided in this area.
  • a circumferential latching can be provided or distributed by individual notches over the circumference.
  • a safeguard against slipping out of the sealing beads 32 from the openings 20 is achieved by a corresponding geometric design of the plastic body of the contact assembly 22 (above the elastomer sealing disk 30).
  • portions of the plastic material of the contact assembly 22 extend axially to just above the sealing beads 32, which are thus secured against leakage from the openings 20.
  • a contact of these sections of the contact assembly 22 to the sealing beads 32 or even an axial compression of these sealing beads 32 is possible, but not provided in the illustrated embodiment.
  • the elastomeric material of the sealing disc 30 is selected with regard to the best possible liquid sealing, but also has a high gas permeability. Thus, a large permeation rate of "volatiles" can be achieved or promoted from the actuator space and from the oxygen into the actuator space.
  • a ventilation hole 37 is provided through the top plate 16 in the illustrated embodiment.
  • the sealing disc material also has the lowest possible electrical conductivity in order to insulate the connection pins 14 from the head arrangement 16, 18 and thus also against each other.
  • An insulating washer 38 is interposed between the elastomeric sealing washer 30 and the metallic top plate 16. This provided with ventilation holes 40 insulating 38 advantageously causes an improvement in the gas flow rate of the seal assembly.
  • the sealing washer 30 When mounting the piezo drive 10, the sealing washer 30 is placed on the protruding from the openings 20 portions of the connecting pins 14, wherein the sealing beads 32 are pressed from above into the openings 20 and thus radially compressed there. Then, by pressing and locking the contact assembly 22, the compression of the sealing washer 30 at the peripheral edge and the securing of the sealing beads 32 accomplished. Finally, a final coating of the upper end of the piezo drive 10 takes place. Finally, a coating of the upper end of the piezo drive 10 takes place. This jacket is provided as a plastic injection 42 and a plastic cover 44 placed thereon.
  • Breakthroughs in the plastic material of the contact assembly 22 ensure that a large part of the contact assembly 22 facing end face of the sealing washer 30 is exposed to a space below the plastic cover 44, so that this end face of the sealing washer 30 can be ventilated particularly efficient.
  • at least one gas exchange opening 46 is provided in the outer plastic sheath 42, 44.
  • the plastic cover 44 is in the illustrated embodiment with the previously applied encapsulation 42 z. B. by a welding (eg., Laser welding) connected.
  • a welding eg., Laser welding
  • This two-part embodiment of the upper region of a housing arrangement has the advantage that the gas exchange opening 46 can be formed in a particularly simple manner as the remaining gap between these two enclosure components.

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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 (20)

  1. Dispositif d'étanchéité d'un actionneur piézoélectrique (12) pour une soupape d'injection de carburant d'un moteur à combustion interne, comprenant des broches de connexion (14) dépassant de l'actionneur piézoélectrique (12) et un élément de tête (16, 18) monté sur l'actionneur piézoélectrique (12) et qui est pourvu d'orifices (20) pour le passage des broches de connexion (14), sur lequel élément de tête (16, 18) est monté un élément d'étanchéité (30) constitué d'un matériau étanche aux liquides, qui se moule de manière étanche, d'une part, contre des surfaces périphériques des broches de connexion (14) et, d'autre part, contre l'élément de tête (16, 18), et d'un module de contact (22) monté sur l'élément de tête (16, 18) pour le raccordement électrique des broches de connexion (14) à un connecteur enfichable (24), dans lequel :
    l'élément d'étanchéité (30) venant en appui étanche sur les surfaces périphériques des broches de connexion (14) est prévu pour se trouver à l'intérieur des orifices (20) et des sections d'éléments d'étanchéité (32) se trouvant à l'intérieur des orifices (20) sont pressées dans le sens radial dans les orifices,
    caractérisé en ce que les sections de l'élément d'étanchéité (32) sont protégées d'une sortie des orifices par des sections du module de contact (22) s'étendant, dans le sens axial, jusqu'au tout début du dessus des sections de l'élément d'étanchéité (32) ou jusqu'aux sections d'éléments d'étanchéité (32).
  2. Dispositif d'étanchéité selon la revendication 1, dans lequel les sections de l'élément d'étanchéité (32) se présentent sous la forme de bourrelets d'étanchéité.
  3. Dispositif d'étanchéité selon la revendication 2, dans lequel les bourrelets d'étanchéité (32) présentent au moins approximativement la forme de joints toriques.
  4. Dispositif d'étanchéité selon la revendication 2 ou 3, dans lequel les bourrelets d'étanchéité (32) forment respectivement l'extrémité d'une section d'élément d'étanchéité dépassant jusque dans l'intérieur de l'orifice (20) en prenant la forme d'un dôme (20) .
  5. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel l'élément d'étanchéité (30) est constitué d'un élastomère.
  6. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel l'élément d'étanchéité (30) est constitué d'un matériau ayant une perméabilité élevée aux gaz.
  7. Dispositif d'étanchéité selon la revendication 6, dans lequel l'élément d'étanchéité (30) est constitué d'un silicone, en particulier d'un fluorosilicone.
  8. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel l'élément d'étanchéité (30) se présente sous forme de disques et la face frontale de l'élément d'étanchéité qui est tournée vers l'élément de tête (16, 18), épouse, dans ses traits essentiels, le contour de l'élément de tête (16, 18).
  9. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel l'élément de tête (16, 18) comprend une plaque de tête (16), dans laquelle les orifices (20) de l'élément de tête sont prévus pour le passage des broches de connexion (14).
  10. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel l'élément d'étanchéité (30) se moule de manière étanche, contre la surface périphérique de l'élément de tête en l'entourant en forme d'anneaux. (16, 18).
  11. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel un boîtier d'actionneur (18) en forme de douille délimite, conjointement avec une plaque de tête (16) et une plaque de fond, qui sont positionnées aux deux extrémités du boîtier de l'actionneur (18), un compartiment d'actionneur, dans lequel est logé l'actionneur piézoélectrique (12).
  12. Dispositif d'étanchéité selon la revendication 11, dans lequel l'élément d'étanchéité (30) est moulé de manière étanche contre l'extrémité axiale du boîtier d'actionneur (18) en forme de douille.
  13. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel le module de contact (22) presse l'élément d'étanchéité (30), au moins sur quelques segments, contre l'élément de tête (16, 18).
  14. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel une compression axiale des sections d'élément d'étanchéité (32) est prévue par l'intermédiaire des sections du module de contact (22).
  15. Dispositif d'étanchéité selon la revendication 13 ou 14, dans lequel le module de contact (22) englobe une zone périphérique de l'élément de tête (16, 18) et est retenu sur cette zone périphérique par un raccord à blocage, en particulier par un raccord à système d'encliquetage (34).
  16. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel un disque isolant (38) doté d'orificespour le passage des broches de connexion (14) et constitué d'un matériau isolant électriquement est positionne entre l'élément d'étanchéité (30) et l'élément de tête (16, 18).
  17. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, dans lequel est prévu au moins un passage d'aération (37) traversant l'élément de tête (16, 18).
  18. Injecteur de carburant pour un moteur à combustion interne, comprenant un dispositif de boîtier d'injecteur (42,44), dans lequel est logé un actionneur piézoélectrique (12, destiné à actionner une soupape d'injection de carburant, avec un dispositif d'étanchéité selon l'une quelconque des revendications 1 à 16.
  19. Injecteur de carburant selon la revendication 18, comprenant un dispositif d'aération (46), qui favorise l'échange gazeux entre la face externe du dispositif de boîtier d'injecteur (42, 44) et la face externe de l'élément d'étanchéité (30).
  20. Utilisation d'un injecteur de carburant selon la revendication 18 ou 19 pour un moteur diesel de type Common Rail.
EP07765689A 2006-06-29 2007-06-28 Dispositif d'étanchéité d'un actionneur piézoélectrique pour une soupape d'injection de carburant d'un moteur à combustion interne Active EP2038541B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006029966A DE102006029966B4 (de) 2006-06-29 2006-06-29 Abdichtungsanordnung eines Piezoaktors für ein Kraftstoffeinspritzventil einer Brennkraftmaschine
PCT/EP2007/056459 WO2008000786A1 (fr) 2006-06-29 2007-06-28 dispositif d'ÉTANCHÉITÉ d'un actionneur piÉZOÉlectrique pour une soupape d'injection de carburant d'un moteur À combustion interne

Publications (2)

Publication Number Publication Date
EP2038541A1 EP2038541A1 (fr) 2009-03-25
EP2038541B1 true EP2038541B1 (fr) 2011-04-13

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EP07765689A Active EP2038541B1 (fr) 2006-06-29 2007-06-28 Dispositif d'étanchéité d'un actionneur piézoélectrique pour une soupape d'injection de carburant d'un moteur à combustion interne

Country Status (6)

Country Link
US (1) US8006669B2 (fr)
EP (1) EP2038541B1 (fr)
CN (1) CN101535626B (fr)
AT (1) ATE505640T1 (fr)
DE (2) DE102006029966B4 (fr)
WO (1) WO2008000786A1 (fr)

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US7628791B2 (en) 2005-08-19 2009-12-08 Covidien Ag Single action tissue sealer
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EP2038541A1 (fr) 2009-03-25
US8006669B2 (en) 2011-08-30
DE102006029966A1 (de) 2008-01-03
DE502007006946D1 (de) 2011-05-26
CN101535626B (zh) 2013-06-05
CN101535626A (zh) 2009-09-16
WO2008000786A1 (fr) 2008-01-03
US20090283072A1 (en) 2009-11-19
DE102006029966B4 (de) 2010-04-22
ATE505640T1 (de) 2011-04-15

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