EP1071878B1 - Injecteur avec piezo-actionneur multicouche - Google Patents

Injecteur avec piezo-actionneur multicouche Download PDF

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Publication number
EP1071878B1
EP1071878B1 EP00907429A EP00907429A EP1071878B1 EP 1071878 B1 EP1071878 B1 EP 1071878B1 EP 00907429 A EP00907429 A EP 00907429A EP 00907429 A EP00907429 A EP 00907429A EP 1071878 B1 EP1071878 B1 EP 1071878B1
Authority
EP
European Patent Office
Prior art keywords
injector
actuator element
circular
plate spring
cylindrical
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 - Lifetime
Application number
EP00907429A
Other languages
German (de)
English (en)
Other versions
EP1071878A1 (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 EP1071878A1 publication Critical patent/EP1071878A1/fr
Application granted granted Critical
Publication of EP1071878B1 publication Critical patent/EP1071878B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M51/06—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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to an injector with a piezo multilayer actuator, in particular for "common rail" diesel injection systems of motor vehicles, which has a multilayer actuator body which is seated within a longitudinal bore of an injector housing and is preloaded on the face side by pretensioning means.
  • FIG. 1 shows the section of the known injector lying around the actuator body.
  • the means prestressing the actuator body 1 consist of a valve-side disc spring 4 which, on the one hand, abuts or engages an annular flange 3 located on the valve-side end face of the actuator body 1 and, on the other hand, on a radially inwardly projecting shoulder 5 of the injector housing 2.
  • the injector housing 2 itself forms the means for transmitting the pretensioning force exerted by the plate spring 4 to the other end face of the actuator body 1.
  • the arrow V indicates the direction to the valve. Due to the diameter of the plate spring 4 serving as a biasing element, the outer diameter of the injector housing 2 is where it is most critical, ie, where the injector housing is by a Cylinder head wall goes, relatively large.
  • an actuator body 1 seated centrally within an injector housing 2 is preloaded on the end face by a pretensioning bracket 6 with a right and left spring leg 6a, 6b by means of a first force-centering pressure element 7 and a second force-centering pressure element 8. Since the two legs 6a, 6b of the pretensioning bracket 6 require space to the left and right of the injector body 1, the outer diameter of the injector housing 2 cannot be reduced in the critical area in this case either.
  • the diameter of the components in the area of the actuator body must be chosen to be as small as possible.
  • An essential aspect of an injector according to the invention with a piezo multilayer actuator consists in that the prestressing means have at least one disc spring, which acts in a prestressing manner on the end face of the actuator body opposite an injector valve, and a force transmission element which is seated in the injector housing and is axially movable therein and which has the spring force of the disc spring ( n) transfers to the valve-side end of the actuator body.
  • the actuator body preferably has a circular cylindrical cross-sectional shape.
  • the sleeve-shaped injector housing has a circular cylindrical inner and outer contour at least in the region of the actuator body and surrounds the actuator body and the force transmission member, which forms a circular cylindrical clamping sleeve, the actuator body abutting a valve-side inner wall of this clamping sleeve and the plate springs between the opposite end face Attack the inner wall of the adapter sleeve and the adjacent face of the actuator body.
  • the biasing spring (s) causing the bias is behind, i.e. H. provided on the side of the actuator body facing away from the valve, so that a narrow construction of the injector is made possible in the area of the actuator body.
  • the thicker actuator head with the plate spring or the plate springs is in the uncritical area of the cylinder head of the internal combustion engine.
  • FIG. 1 shows in the form of a schematic longitudinal section the known injector already described with a valve-side pretensioning element designed as a plate spring.
  • FIG. 2 shows in the form of a schematic longitudinal section the other known injector already described, which contains a two-legged pretensioning bracket as the pretensioning element.
  • FIG. 3 shows in the form of a schematic longitudinal section a preferred embodiment of an injector according to the invention with a piezo multilayer actuator.
  • a cylindrical actuator body 10 of a piezo multilayer actuator which can have the form of a multilayer laminate composed of layers of piezoelectric material stacked on top of one another and metallic or electrically conductive layers serving as electrodes, is pretensioned on the end face by pretensioning means.
  • the biasing means consist of a plate spring assembly 14 and a cylindrical clamping sleeve 11, which are seated within a cylindrical injector housing 12.
  • the actuator body 10 of the piezo multilayer actuator ends at the end facing the valve V in a pressure bolt 16, which passes through a central bore 19 in the cylindrical clamping sleeve 11.
  • the opposite end to the valve The end face of the actuator body 10 ends in a support element 17, which in turn has a bolt-shaped end that projects through a central bore 20 of the clamping sleeve 11 and abuts there against a radial inner wall of the injector housing 12.
  • the electrodes (not shown) of the actuator body 10 performs analogous pulsating strokes, changing the distance between them by the aforementioned biasing means, i. H. the plate spring assembly 14 and the clamping sleeve 11 clamped end faces.
  • the clamping sleeve 11 seated in the central longitudinal bore 18 of the injector housing 12 moves together with the valve-side end, ie. H. with the pressure pin 16 of the actuator in the axial direction V against the spring force exerted by the plate spring assembly 14, since the clamping sleeve 11 is clamped between the valve-side end of the actuator and the opposite end of the plate spring assembly 14 by the biasing force of the plate spring assembly 14.
  • the plate springs of the plate spring assembly 14 can have a diameter sufficient for a desired spring force.
  • the axial length of the radial extension 13 of the clamping sleeve 11 is by the distance d less than the axial inside dimension of the radial extension 15 of the injector housing 12, so that there remains space for the above-mentioned axial movement of the clamping sleeve 11 caused by the actuator strokes.
  • the embodiment according to the invention described above with reference to FIG. 3 offers an injector with a piezo multilayer actuator, since the prestressing element, i. H. the plate spring assembly 14 behind the actuator body 10, d. H. is at a position that faces away from the valve side of the actuator body 10, a narrow design of the injector in the area of the relatively long piezoelectric actuator body 10, the thicker head of which is located with the plate spring assembly 14 in the uncritical area of the cylinder head of the internal combustion engine.
  • designs of an injector equipped with a piezo multilayer actuator are possible which are no longer than conventional solenoid valve injectors.

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 (6)

  1. Injecteur, notamment pour des systèmes d'injection de Diesel « Common-Rail » de véhicules automobiles, comprenant un actionneur multicouches piézoélectrique, présentant un corps d'actionneur (10) multicouches précontraint au niveau de la face frontale par des moyens de précontrainte (11, 14) et situé dans un perçage longitudinal central (18) d'un carter d'injecteur (12),
    caractérisé en ce que
    les moyens de précontrainte (11, 14) comprennent au moins une rondelle Belleville (14) intervenant, pour assurer une précontrainte, au niveau de la face frontale du corps d'actionneur (10) opposée à une soupape d'injection (V), et un organe de transmission de forces (11) placé dans le carter d'injecteur (12) et axialement mobile à l'intérieur de celui-ci, et qui transmet la force élastique de la (des) rondelle(s) Belleville (14) à la face frontale du corps d'actionneur (10) côté soupape.
  2. Injecteur selon la revendication 1,
    caractérisé en ce que
    le corps d'actionneur (10) présente une forme de section transversale cylindrique circulaire.
  3. Injecteur selon la revendication 1 ou 2,
    caractérisé en ce que
    le carter d'injecteur (12) entoure le corps d'actionneur (10) et l'organe de transmission de forces (11) tel qu'un manchon et présente, du moins dans la zone du corps d'actionneur (10), un contour intérieur et extérieur cylindrique circulaire.
  4. Injecteur selon la revendication 3,
    caractérisé en ce que
    l'organe de transmission de forces (11) est un manchon de serrage cylindrique circulaire, le corps d'actionneur (10) butant contre une paroi intérieure radiale côté soupape du manchon de serrage (11), et la (les) rondelle(s) Belleville (14) intervenant entre une paroi intérieure radiale opposée du manchon de serrage (11) et la face frontale voisine du corps d'actionneur (10).
  5. Injecteur selon la revendication 4,
    caractérisé en ce que
    la (les) rondelle(s) Belleville (14) et les parois frontales du manchon de serrage (11) présentent des perçages (19, 20) axiaux centraux traversés par respectivement un élément d'appui (17) du corps d'actionneur (10) et un boulon de compression (16) saillant du corps d'actionneur (10) vers le côté de soupape (V).
  6. Injecteur selon l'une des revendications 3 à 5,
    caractérisé en ce que
    le carter d'injecteur (12), dans le segment de la (des) rondelle(s) Belleville (14), forme un évasement (15) cylindrique circulaire radial, le manchon de serrage (11) présente un évasement (13) radial cylindrique circulaire mobile dans l'évasement (15) cylindrique circulaire du carter d'injecteur (14), et la (les) rondelle(s) Belleville présentent un diamètre extérieur supérieur au diamètre du corps d'actionneur (10) et est (sont) disposée(s) de manière centrée dans l'évasement (13) radial cylindrique circulaire du manchon de serrage (11).
EP00907429A 1999-02-16 2000-01-14 Injecteur avec piezo-actionneur multicouche Expired - Lifetime EP1071878B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19906467 1999-02-16
DE19906467A DE19906467A1 (de) 1999-02-16 1999-02-16 Injektor mit einem Piezo-Mehrlagenaktor
PCT/DE2000/000122 WO2000049286A1 (fr) 1999-02-16 2000-01-14 Injecteur avec piezo-actionneur multicouche

Publications (2)

Publication Number Publication Date
EP1071878A1 EP1071878A1 (fr) 2001-01-31
EP1071878B1 true EP1071878B1 (fr) 2004-03-31

Family

ID=7897691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00907429A Expired - Lifetime EP1071878B1 (fr) 1999-02-16 2000-01-14 Injecteur avec piezo-actionneur multicouche

Country Status (6)

Country Link
US (1) US6371085B1 (fr)
EP (1) EP1071878B1 (fr)
JP (1) JP2002537515A (fr)
KR (1) KR20010042665A (fr)
DE (2) DE19906467A1 (fr)
WO (1) WO2000049286A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10002437A1 (de) * 2000-01-21 2001-08-16 Bosch Gmbh Robert Piezoaktor
DE10025997A1 (de) * 2000-05-25 2001-12-06 Bosch Gmbh Robert Piezoaktor
DE10122256A1 (de) * 2001-05-08 2002-11-21 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für Brennkraftmaschinen, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
DE10142798C2 (de) * 2001-08-31 2003-07-31 Bosch Gmbh Robert Lagerung für ein Piezoaktormodul in einem Common-Rail-Injektor
US6983894B2 (en) 2002-02-13 2006-01-10 Siemens Vdo Automotive Inc. Piezo-electrically actuated canister purge valve with a hydraulic amplifier
US6811093B2 (en) * 2002-10-17 2004-11-02 Tecumseh Products Company Piezoelectric actuated fuel injectors
US20050258715A1 (en) * 2004-05-19 2005-11-24 Schlabach Roderic A Piezoelectric actuator having minimal displacement drift with temperature and high durability
DE102005024710A1 (de) * 2005-05-30 2006-12-07 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005046174B4 (de) * 2005-09-27 2008-12-04 Siemens Ag Spannfeder
US20070075286A1 (en) * 2005-10-04 2007-04-05 Par Technologies, Llc Piezoelectric valves drive
DE602006016234D1 (de) * 2006-04-25 2010-09-30 Delphi Tech Holding Sarl Schutzverkapselung
DE102011084107A1 (de) * 2011-10-06 2013-04-11 Continental Automotive Gmbh Piezoelektrischer Aktuator
DE102013012444A1 (de) * 2013-07-29 2015-01-29 Astrium Gmbh Ventilanordnung zum Schalten und/oder Regeln eines Medienstroms eines Raumfahrttriebwerks und Raumfahrttriebwerk
DE102014009025B4 (de) * 2014-06-24 2016-02-18 Airbus Ds Gmbh Biegerahmen zur Velängerung des Stellwegs eines Aktors für ein mechanisch betätigtes Bauteil

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533975A1 (de) * 1985-09-24 1987-03-26 Bosch Gmbh Robert Zumessventil zur dosierung von fluessigkeiten oder gasen
JPH07117012B2 (ja) * 1986-09-05 1995-12-18 トヨタ自動車株式会社 ユニツトインジエクタ
US5004945A (en) * 1988-09-26 1991-04-02 Nippondenso Co., Ltd. Piezoelectric type actuator
DE4306072C2 (de) * 1993-02-26 1994-12-08 Siemens Ag Vorrichtung zum Öffnen und Verschließen einer in einem Gehäuse vorhandenen Durchtrittsöffnung
DE19650900A1 (de) * 1996-12-07 1998-06-10 Bosch Gmbh Robert Piezoelektrischer Aktuator
DE19653555C2 (de) * 1996-12-20 2002-10-31 Siemens Ag Piezoelektrischer Aktor
DE19702066C2 (de) * 1997-01-22 1998-10-29 Daimler Benz Ag Piezoelektrischer Injektor für Kraftstoffeinspritzanlagen von Brennkraftmaschinen
DE19744235A1 (de) * 1997-10-07 1999-04-08 Fev Motorentech Gmbh & Co Kg Einspritzdüse mit piezoelektrischem Aktuator
US5875764A (en) * 1998-05-13 1999-03-02 Siemens Aktiengesellschaft Apparatus and method for valve control
DE19905413A1 (de) * 1999-02-10 2000-08-24 Bosch Gmbh Robert Injektor mit Piezo-Mehrlagenaktor für Einspritzsysteme
DE19919313B4 (de) * 1999-04-28 2013-12-12 Robert Bosch Gmbh Brennstoffeinspritzventil
US6253736B1 (en) * 1999-08-10 2001-07-03 Cummins Engine Company, Inc. Fuel injector nozzle assembly with feedback control

Also Published As

Publication number Publication date
DE19906467A1 (de) 2000-08-24
WO2000049286A1 (fr) 2000-08-24
JP2002537515A (ja) 2002-11-05
KR20010042665A (ko) 2001-05-25
US6371085B1 (en) 2002-04-16
EP1071878A1 (fr) 2001-01-31
DE50005857D1 (de) 2004-05-06

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