EP1820960B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1820960B1
EP1820960B1 EP20070100009 EP07100009A EP1820960B1 EP 1820960 B1 EP1820960 B1 EP 1820960B1 EP 20070100009 EP20070100009 EP 20070100009 EP 07100009 A EP07100009 A EP 07100009A EP 1820960 B1 EP1820960 B1 EP 1820960B1
Authority
EP
European Patent Office
Prior art keywords
actuator
fuel injection
support elements
injection valve
support
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
EP20070100009
Other languages
German (de)
English (en)
Other versions
EP1820960A3 (fr
EP1820960A2 (fr
Inventor
Friedrich Boecking
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 EP1820960A2 publication Critical patent/EP1820960A2/fr
Publication of EP1820960A3 publication Critical patent/EP1820960A3/fr
Application granted granted Critical
Publication of EP1820960B1 publication Critical patent/EP1820960B1/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
    • F02M51/06—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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/707—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for avoiding fuel contact with actuators, e.g. isolating actuators by using bellows or diaphragms

Definitions

  • the invention relates to a fuel injection valve for fuel injection systems of internal combustion engines. Specifically, the invention relates to an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • the known injector has a piezoelectric actuator, which is arranged in an injector body and is held by a spring means on the one hand with the injector and on the other hand with a sleeve-like booster piston in abutment.
  • the piezoelectric actuator is sealed at its upper side by means of a conical region against the injector body, whereby an electrical connection can be led out through a bore from the injector body.
  • the from the DE 103 26 259 A1 known injector has the disadvantage that a centering of the actuator during assembly is complex and may optionally be done over the life of the injector, a change in position of the actuator from its centered starting position.
  • a piezoelectric actuator with a piezoelectric element and a housing is shown, wherein the piezoelectric element is at least partially insulated electrically insulated by a sleeve of the housing and mechanically stabilizing.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that a support of the actuator is ensured in the valve housing. This allows easy centering of the actuator during assembly and operation of the fuel injection valve.
  • the support element abuts at least in sections on the inner wall of the valve housing.
  • an attenuation of the actuator is also achieved, whereby a reliable operation of the fuel injection valve is made possible, especially at high switching frequencies.
  • the electrical insulation is thermally conductive to allow a derivation of the resulting heat loss in the actuator on the support member to the housing.
  • the support element may have one or more bulbous portions on which the support element bears against the inner wall of the valve housing.
  • a transition piece in particular an actuator base or an actuator head, is attached to the actuator having at least one circumferential groove, and that the insulation has a Eindusfase which surrounds the transition piece in the region of the groove circumferentially.
  • the support element in the region of the Einsilifase have a bulbous portion, so that a support and centering in the region of the transition piece is made possible. This configuration can also be provided both on the actuator base and on the actuator head.
  • embedded in the insulation centering ring is provided, which allows reliable centering of the actuator, at least within certain limits.
  • centering the centering of the actuator can be further improved by means of one or more support elements.
  • the support element has at least one embedded in the insulation supporting fabric.
  • the support fabric extends at least in the radial direction in order to achieve a stiffening of the support element.
  • the shape and design of the support element can be specified by the support fabric.
  • At least three support elements are provided, so that a reliable centering of the actuator is achieved, whereby friction losses are reduced and a flow of the fuel past the actuator is ensured.
  • Fig. 1 shows a first embodiment of a fuel injection valve 1 of the invention.
  • the Fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • the fuel injection valve 1 is suitable for commercial vehicles or passenger cars.
  • a preferred use of the fuel injector 1 is for a common rail fuel injection system that delivers diesel fuel under high pressure to multiple fuel injectors.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 has a piezoelectric actuator 2, which is arranged in a valve housing 3.
  • a fuel line can be connected to a fuel inlet connection 4 connected to the valve housing 3 in order to introduce fuel into an actuator chamber 5 provided in the interior of the valve housing 3.
  • the actuator chamber 5 is separated by a housing part 6 from a likewise provided in the interior of the valve housing 3 fuel chamber 7.
  • openings 8, 9 are formed in the housing part.
  • valve seat body 15 inserted into the valve housing 3 is provided, on which a valve seat surface 16 is formed.
  • the valve closing body 17 is connected to a pressure chamber 19 arranged in the actuator chamber 5, wherein the valve needle 18 by means of the pressure plate is acted upon by the bias of a valve spring 21 with a closing force, so that formed between the valve closing body 17 and the valve seat 16 sealing seat in the in the Fig. 1 illustrated initial state is closed.
  • a connection element 25 is provided on the valve housing 3, wherein the electrical supply line to electrical lines 26, 27 can be connected.
  • the electrical lines 26, 27 are guided through a bore 28 and formed by an actuator 29 as a transition piece 29 to the actuator 2.
  • the transition piece 29 has a conical sealing portion 30 which is pressed by means of the bias of the valve spring 21 against the valve housing 3 to seal the bore 28 relative to the fuel provided in the actuator chamber 5.
  • the actuator 2 is supported via the transition piece 29 on the valve housing 3.
  • a designed as an actuator head 31 transition piece 31 is provided, via which the actuator 2 acts on the pressure plate 19.
  • the transition piece 29 is attached to an end face 32 of the actuator 2 to the actuator 2.
  • the transition piece 31 is attached to an end face 33 of the actuator 2 to the actuator 2.
  • the actuator 2 When a voltage is applied between the electrical lines 26, 27, the actuator 2 is charged, whereby it expands and actuates the valve closing body 17 against the force of the valve spring 21. Characterized the sealing seat formed between the valve seat surface 16 and the valve closing body 17 is opened, so that fuel from the fuel chamber 7 is injected via an annular gap 35 and the open sealing seat in a combustion chamber of an internal combustion engine.
  • the actuator 2 has an outer side 36. Furthermore, an electrically insulating insulation 37 is provided, which surrounds the actuator 2 on the outer side 36 circumferentially.
  • the insulation 37 has support elements 38, 39 which extend in an axial direction, ie in the direction of the axis 45, with respect to an axis 45 of the valve housing 3.
  • the support element 38 has bulbous sections 46, 47, 48, on which the support element 38 bears against an inner wall 49 of the actuator chamber 5 of the valve housing 3.
  • the support member 39 has bulbous portions 50, 51, 52, on which the support member 39 abuts the inner wall 49 of the valve housing 3 in order to enable a support of the actuator 2 in a radial direction. Due to this configuration of the support elements 38, 39 an advantageous support of the actuator 2 is given in the valve housing 3, which ensures sufficient mobility of the actuator 2 in an axial direction.
  • the insulation 37 and in particular the support elements 38, 39 of the insulation 37 are preferably made thermally conductive, so that the heat generated during actuation of the actuator 2 via the bulbous portions 46, 47, 48 of the support member 38 and the bulbous portions 50, 51, 52nd of the support member 39 can be discharged to the valve housing 3. Further, by the contact between the actuator 2 and the valve housing 3 by means of the support elements 38, 39 reaches an advantageous damping of the actuator 2. Thereby, a high reliability of the fuel injection valve 1 is given even with an actuation of the actuator 2 at high frequency.
  • the transition piece 29 has circumferential grooves 53. These circumferentially circumferential grooves 53 are surrounded by a Einzhoufase 54 of the insulation 37, the Ein manufacturedfase 54 also fills the circumferential grooves 53, so that a reliable connection between the insulation 37 and the transition piece 29 is ensured. A corresponding embodiment is also provided in the transition piece 31.
  • the introduction chamfer 54 may be designed circumferentially in the circumferential direction or be provided only in the region of the support elements 38, 39.
  • Fig. 2 shows a section through the in Fig. 1 shown fuel injector 1 along the section line designated II.
  • the support members 40, 41 shown which are configured according to the support members 38, 39.
  • the support elements 38, 39, 40, 41 form individual arms in order to support the actuator 2 radially against the valve housing 3. Due to the arm-like configuration of the support elements 38, 39, 40, 41, a flow of the fuel past the bushing 37 surrounded by the actuator 2 is also made possible.
  • the actuator 2 of the first embodiment has a rectangular, in particular square, cross section, wherein on each longitudinal side 55, 56, 57, 58 of the outer side 36 of the actuator 2 of the support members 38, 39, 40, 41 is arranged. As a result, the actuator 2 is supported in the result in all radial directions against the valve housing 3 as a result.
  • Fig. 3 shows the in Fig. 2 shown section through a fuel injection valve 1 according to a second embodiment of the invention.
  • the actuator 2 also has an at least approximately rectangular, in particular square, cross-section.
  • the support elements 38, 39, 40, 41 in the region of the formed between the longitudinal sides 55, 56, 57, 58 longitudinal edges 60, 61, 62, 63 of the actuator 2 are arranged. This also results in a support of the actuator 2 in each radial direction.
  • Fig. 4 shows the in Fig. 2 shown section through the fuel injection valve 1 according to a third embodiment of the invention.
  • the actuator 2 has a circular cross-section.
  • the outer side 36 of the actuator is therefore designed cylinder jacket-shaped.
  • three support elements 38, 39, 40 are provided, which are distributed around the circumference of the actuator 2, that an angle between each two of the support members 38, 39, 40 with respect the axis 45 is less than 180 °.
  • the support elements 38, 39, 40 are arranged equidistant from each other.
  • Fig. 5 shows the in Fig. 2 with V designated section according to a fourth embodiment of the invention.
  • a support fabric 65 is introduced into the support member 38, which extends in a radial direction and extends to the inner wall 49 of the valve housing 3, wherein the support fabric 65 is slightly spaced from the outer side 36 of the actuator 2.
  • the support fabric 65 can also be up to the outside 36 of the actuator 2 extend and be slightly spaced from the inner wall 49.
  • the support fabric 65 may also rest against both the inner wall 49 of the valve housing 3 and on the outer side 36 of the actuator 2.
  • the support member 38 has bulbous portions 46, 47, 48, as in Fig.
  • a plurality of individual support fabric 65 may be provided, which are each arranged in one of the bulbous portions 46, 47, 48, or the support fabric 65 may be configured according to the bulbous portions 46, 47, 48.
  • the support fabric 65 may also specify the design of the support element 38.
  • the support fabric 38 may also specify the configuration of the bulbous portions 46, 47, 48 of the support member 38.
  • the support fabric 65 is preferably embedded in the insulation 37 and stiffen the support member 38 in both a radial direction and in an axial direction.
  • support elements 39, 40, 41 may also have one or more support fabric.
  • Fig. 6 shows the in Fig. 1 labeled VI section of a fuel injection valve 1 according to a fifth embodiment of the invention.
  • circumferential grooves 53, 53 ' are provided, wherein in the region of the circumferential grooves 53, 53' the Ein Industriesfase 54 extends over the transition piece 29, so that a positive connection between the insulation 37 and the transition piece 29 is formed.
  • a centering ring 66 is provided which surrounds the actuator 2 circumferentially and the on the one hand abuts against the inner wall 49 of the valve housing 3 and on the other hand on the outer side 36 of the actuator 2.
  • the centering ring 36 has a plurality of continuous recesses 67, which are filled with the material of the insulation 37, so that a reliable connection of the centering ring 66 with the insulation 37 and the actuator 2 is achieved.
  • centering ring 66 By centering ring 66, the centering of the actuator 2 in the valve housing 3 can be further improved. In particular, tolerances in the formation of an elastically and / or plastically deformable insulation 37 can be compensated.
  • Fig. 5 illustrated support fabric 65 and the in Fig. 6 illustrated centering ring 66 made of different materials, in particular metal or plastic, may be formed.
  • the support elements 38, 39, 40, 41 are configured as rib-shaped support elements 38, 39, 40, 41, wherein one or more interruptions may be provided in the axial direction, in the described embodiments between the bulbous portions 46th , 47, 48, 50, 51, 52 are formed and improve the axial mobility.
  • the rib-shaped support elements 38, 39, 40, 41 ensure a largely unhindered flow of the fuel from the fuel inlet stub 4 past the actuator 2 to the fuel chamber 7.

Landscapes

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

Claims (11)

  1. Soupape d'injection de carburant (1), notamment injecteur pour des installations d'injection de carburant pour moteurs à combustion interne à suralimentation et autoallumage, comprenant un actionneur (2) disposé dans un boîtier de soupape (3) et un corps de fermeture de soupape (17) pouvant être actionné par l'actionneur (2) au moyen d'un pointeau de soupape (18), qui coopère avec une surface de siège de soupape (16) pour former un ajustement étanche, une isolation (37) isolante électriquement entourant l'actionneur (2) au moins sur sa périphérie étant prévue, caractérisée en ce que l'isolation (37) présente au moins trois éléments de support (38, 39, 40, 41) de configuration en forme de nervures, en ce que chaque élément de support (38, 39, 40, 41) s'étend, par rapport à un axe (45) du boîtier de soupape (3), dans une direction axiale, et en ce que les éléments de support (38, 39, 40, 41) sont disposés, par rapport à l'axe (45) du boîtier de soupape (3) de telle sorte que l'actionneur (2) soit supporté par les éléments de support (38, 39, 40, 41) radialement contre la paroi interne (49) du boîtier de soupape (3), les éléments de support (38, 39, 40, 41) assurant un flux essentiellement ininterrompu de carburant devant l'actionneur (2) jusqu'à une chambre de carburant (7).
  2. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    les éléments de support (38, 39, 40, 41) s'appliquent au moins en partie contre la paroi interne (49) du boîtier de soupape (3).
  3. Soupape d'injection de carburant selon la revendication 2,
    caractérisée en ce que
    l'isolation (37) est réalisée sous forme d'isolation thermoconductrice (37).
  4. Soupape d'injection de carburant selon la revendication 2 ou 3,
    caractérisée en ce que
    les éléments de support (38, 39, 40, 41) présentent à chaque fois une portion de forme bombée (46, 47, 48) et les éléments de support (38, 39, 40, 41) s'appliquent contre la paroi interne (49) du boîtier de soupape (3).
  5. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce
    qu'une pièce de transition (29, 31) est assemblée à l'actionneur (2) sur au moins un côté frontal (32, 33) de l'actionneur (2), en ce que la pièce de transition (29, 31) présente au moins une rainure (53, 53') au moins partiellement périphérique, et en ce que l'isolation (37) présente un biseau d'insertion (54), qui enveloppe sur la périphérie la pièce de transition (29, 31) au moins dans une région de la rainure (53, 53').
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce
    qu'au moins une bague de centrage (66) est prévue, laquelle est encastrée au moins en partie dans l'isolation (37).
  7. Soupape d'injection de carburant selon la revendication 6,
    caractérisée en ce que
    la bague de centrage (66) est disposée dans une région d'un côté frontal (32, 33) de l'actionneur (2).
  8. Soupape d'injection de carburant selon la revendication 6 ou 7,
    caractérisée en ce que
    la bague de centrage (66) entoure l'actionneur (2) sur sa périphérie.
  9. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 8,
    caractérisée en ce que
    les éléments de support (38, 39, 40, 41) présentent à chaque fois au moins un tissu de support (65) qui est encastré dans l'isolation (37), et en ce que le tissu de support (65) s'étend dans la direction radiale dans l'élément de support (38, 39, 40, 41) pour renforcer l'élément de support respectif (38, 39, 40, 41).
  10. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 9,
    caractérisée en ce que
    l'actionneur (2) présente une section transversale au moins approximativement rectangulaire, en ce qu'au moins quatre éléments de support (38, 39, 40, 41) sont prévus et en ce qu'au moins l'un des éléments de support (38, 39, 40, 41) est prévu sur chaque côté longitudinal (55, 56, 57, 58) de l'actionneur (2).
  11. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 9,
    caractérisée en ce que
    l'actionneur (2) présente une section transversale au moins approximativement rectangulaire, en ce qu'au moins quatre éléments de support (38, 39, 40, 41) sont prévus et en ce que l'un des éléments de support (38, 39, 40, 41) est prévu sur chaque arête longitudinale (60, 61, 62, 63) de l'actionneur (2).
EP20070100009 2006-02-15 2007-01-02 Soupape d'injection de carburant Expired - Fee Related EP1820960B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610006889 DE102006006889A1 (de) 2006-02-15 2006-02-15 Brennstoffeinspritzventil

Publications (3)

Publication Number Publication Date
EP1820960A2 EP1820960A2 (fr) 2007-08-22
EP1820960A3 EP1820960A3 (fr) 2009-03-04
EP1820960B1 true EP1820960B1 (fr) 2010-11-03

Family

ID=38012664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070100009 Expired - Fee Related EP1820960B1 (fr) 2006-02-15 2007-01-02 Soupape d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1820960B1 (fr)
DE (2) DE102006006889A1 (fr)
ES (1) ES2355077T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008008111A1 (de) * 2008-02-08 2009-08-13 Continental Automotive Gmbh Einspritzventil, Verfahren und Vorrichtung zur Steuerung eines Einspritzventils

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19856186A1 (de) * 1998-12-05 2000-06-15 Bosch Gmbh Robert Piezoelektrischer Aktor
DE19914411A1 (de) * 1999-03-30 2000-10-12 Bosch Gmbh Robert Piezoelektrischer Aktor
DE10025997A1 (de) * 2000-05-25 2001-12-06 Bosch Gmbh Robert Piezoaktor
JP4248777B2 (ja) * 2000-12-28 2009-04-02 株式会社デンソー インジェクタ用圧電体素子及びその製造方法，並びにインジェクタ
ITBO20010279A1 (it) * 2001-05-08 2002-11-08 Magneti Marelli Spa Iniettore di carburante con attuatore piezoelettrico alloggiato in una camera isolata
DE10230032A1 (de) * 2002-07-04 2004-01-22 Daimlerchrysler Ag Piezoelektrischer Aktor für umströmende Medien sowie Verwendung eines entsprechenden piezoelektrischen Aktors
DE10326259A1 (de) 2003-06-11 2005-01-05 Robert Bosch Gmbh Injektor für Kraftstoff-Einspritzsysteme von Brennkraftmaschinen, insbesondere von direkteinspritzenden Dieselmotoren
DE102004010186A1 (de) * 2004-03-02 2005-09-22 Siemens Ag Piezokörper, Piezoaktuator und Fluidinjektor
DE102005025137A1 (de) * 2005-06-01 2006-12-07 Siemens Ag Piezoelektrische Aktoreinheit mit verbesserter Wärmeableitung sowie Kraftstoffinjektor

Also Published As

Publication number Publication date
DE102006006889A1 (de) 2007-08-23
EP1820960A3 (fr) 2009-03-04
DE502007005510D1 (de) 2010-12-16
EP1820960A2 (fr) 2007-08-22
ES2355077T3 (es) 2011-03-22

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