EP1135597A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP1135597A1
EP1135597A1 EP00972607A EP00972607A EP1135597A1 EP 1135597 A1 EP1135597 A1 EP 1135597A1 EP 00972607 A EP00972607 A EP 00972607A EP 00972607 A EP00972607 A EP 00972607A EP 1135597 A1 EP1135597 A1 EP 1135597A1
Authority
EP
European Patent Office
Prior art keywords
valve
actuator
fuel injection
injection valve
flange
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.)
Withdrawn
Application number
EP00972607A
Other languages
German (de)
English (en)
Inventor
Wolfgang Ruehle
Hubert Stier
Matthias Boee
Guenther Hohl
Norbert Keim
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 EP1135597A1 publication Critical patent/EP1135597A1/fr
Withdrawn legal-status Critical Current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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M51/0607—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means the actuator being hollow, e.g. with needle passing through the hollow space
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • Changes in length of a piezoelectric actuator of a fuel injector are usually compensated for by temperature influences by means of hydraulic devices or by the choice of suitable material combinations.
  • a fuel injector is known from DE 197 02 066 C2, in which the change in length of the actuator is compensated for by a corresponding combination of materials.
  • Fuel injection valve has an actuator which is guided in the valve housing under spring pretension and cooperates with an actuating part consisting of an actuating body and a head part, the
  • the headboard rests on the piezo actuator and the
  • Actuating body passes through an inner recess of the actuator.
  • the actuating body is operatively connected to a valve needle.
  • Actuator actuates the valve needle against the spray direction.
  • the actuator and the actuating body have at least approximately the same length and are made of a ceramic material or of a material similar to ceramic with respect to the thermal expansion. Due to the same lengths and coefficients of thermal expansion of the materials used, e.g. B. INVAR, it is achieved that the actuator and the Betat Trentskorper expand evenly through the action of heat and thereby have no negative impact m in relation to the opening and closing tents. An undesired opening of the fuel injector between the switching pulses is also avoided.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the temperature compensation is independent of the thermal expansion coefficient of the piezoceramic.
  • the thermal expansion is compensated for by damping elements with a speed-dependent transmission behavior for impulses and is therefore independent of the choice of material for the actuating element and valve housing. This will make one ensures safe and precise operation of the fuel injector.
  • the encapsulation and pretensioning of the actuator in an actuator housing are advantageous, since the thermal change in length of the actuator does not have to be compensated for by complex material combinations, but is compensated for by a pretensioning spring.
  • the overall length of the actuator housing is not influenced by thermal changes in length. Therefore, only a change in position of the actuator housing relative to the valve housing has to be compensated for by decoupling the actuator and the valve housing.
  • Fig. 1 shows an axial section through a first embodiment of a fuel injector according to the invention
  • Fig. 2 shows an axial section through a second embodiment of an inventive
  • Fig. 1 shows an axial sectional view of a first embodiment of an inventive
  • Fuel injector 1 This is an inwardly opening fuel injector 1.
  • an annular actuator 3 with a central recess 7, which consists of disk-shaped, piezoelectric or magnetostrictive elements 4, and a biasing spring 5 are arranged in an actuator housing 2.
  • the actuator 3 is actuated by an electronic control device via a plug contact, not shown.
  • a plug contact for simplification, only a single connecting wire 6 is shown in FIG. 1.
  • the actuator housing 2 consists of a sleeve 8 and an actuator housing cover 9.
  • the actuator housing cover 9 bears against a first end 10 of the biasing spring 5.
  • a first end face 11 of the actuator 3 bears against an injection-side end of the sleeve 8, the actuator 3 being radially surrounded by the sleeve 8.
  • a second end face 12 of the actuator 3 and a second end 13 of the biasing spring 5 are supported on an intermediate central flange 14.
  • the actuator 3 is biased via the sleeve 8 by the biasing spring 5.
  • the central flange 14 is preferably non-positively connected to an actuating body 16 by a weld 15.
  • the actuating body 16 is arranged in the central recess 7 of the actuator 3 and is connected to a valve needle 17, on which a valve closing body 18 is formed.
  • a valve closing body 18 is lifted off a valve seat surface 19
  • fuel is sprayed through an injection opening 20 formed in a valve seat body 29.
  • the actuating body 16 is supported at the end on a return spring 21.
  • the fuel flows through a fuel inlet 22 of a valve housing 23 which is made close to the sealing seat and via an intermediate space 24 between the valve needle 17 and the valve housing 23 to the sealing seat.
  • the damping members 25a, 25b consist of a plastic, in particular uncrosslinked silicone rubber, which behaves almost statically at a high rate of deformation and is elastically or plastically deformable at a low rate of deformation.
  • the damping members 25a, 25b have mechanical springs 27, the damping behavior of which is superimposed on the damping behavior of the plastic.
  • the plastic is advantageously encapsulated in a casing 26.
  • the attenuators 25a, 25b buffer the actuator housing 2 against the valve housing 23.
  • the damping members 25a, 25b located between the valve housing 23 and the actuator housing 2 behave like an incompressible solid, since the actuator 3 expands too quickly when it is actuated. than that the attenuators 25a, 25b could be compressed.
  • the attenuators 25a, 25b behave almost statically, whereby the pulse triggered by the electrical actuation voltage on the Actuator 16 is transmitted and the fuel injector 1 opens.
  • a fuel injector 1 experiences large temperature fluctuations during operation. On the one hand, the entire fuel injection valve 1 heats up through contact with the combustion chamber of an internal combustion engine, and on the other hand, local temperature changes occur, for example. B. by the power loss when deforming the piezoelectric actuator 3 or by electrical charge movement. This results in a thermal reduction in the length of the disc-shaped elements 4, since piezoelectric ceramics have negative coefficients of thermal expansion, that is to say they contract when heated and expand when cooled.
  • Such a shortening of the actuator 3 by heating is compensated for within the actuator housing 2 by the expansion of the prestressed biasing spring 5.
  • the shortening of the actuator 3 leads to an extension of the biasing spring 5. Since the central flange 14 is locked to the actuating body 16 via the weld seam 15, the change in length of the actuator 3 results in a change in position of the actuator housing 2.
  • This change in position of the actuator housing 2 is caused by the buffering of the actuator housing 2 within the valve housing 23 is compensated by the damping elements 25a, 25b, since in the event of quasi-static changes in the position of the actuator housing 2 relative to the valve housing 23, the movement of the actuator housing 2 takes place so slowly due to temperature influences that the damping elements 25a, 25b are deformed elastically or plastically.
  • the actuator 3 rests on its second end face 12 against an actuator housing cover 30, on which a pretensioning spring 5 is supported, which is clamped between the actuator housing cover 30 and a valve housing cover 28.
  • the actuator 3 is supported with its first end face 11 on a flange 31 which is operatively connected to the valve housing 23 by a weld seam 32.
  • the actuator body 16 is attached to the actuator housing cover 30 and is passed through the central recess 7 of the actuator 3.
  • the end of the actuating body 16 projects into a valve sleeve 33.
  • a return spring 21 and a damping element 25 are encapsulated in the valve sleeve 33 in such a way that the return spring 21 and the damping element 25 are supported on an intermediate valve needle flange 34.
  • the return spring 21 is clamped between a cover plate 38 of the valve sleeve 33 and the valve needle flange 34.
  • the valve needle flange 34 is formed in one piece with the valve needle 17, which projects through a recess 35 in a base plate 37 of the valve sleeve 33.
  • the valve needle 17 is guided through a valve needle guide 36.
  • the end of the valve needle 17 is formed by the valve closing body 18, which forms a sealing seat with the valve seat surface 19.
  • the fuel is supplied via a lateral fuel inlet 22 and flows through an intermediate space 24 between the valve needle 17 and the valve housing 23 to the sealing seat.
  • At least one spray opening 20 is formed in the valve seat body 29.
  • the piezoelectric elements 4 of the actuator 3 expand. Since the actuator 3 rests with its first end face 11 on the flange 31, which is firmly connected to the valve housing 23 via the weld seam 32, it expands in the stroke direction and takes the actuator body 16 m in the stroke direction.
  • the actuating body connected to the valve sleeve 33 m 16 then, due to the hard transmission behavior of the damping element 25, takes the valve needle 17 with it via the valve needle flange 34 and thereby opens the fuel injection valve 1.
  • the hard transmission behavior of the attenuator 25 is due to the high switching speed of the actuator 3.
  • the movement of the actuating body 16 takes place when the actuator 3 is actuated so quickly that the damping member 25 behaves like an mcompressible solid and transmits the impulse to the valve needle flange 34 and the valve needle 17.
  • the fuel injection valve 1 is also subject to thermal expansion.
  • the attenuator 25 shows a soft transmission behavior.
  • the actuating body 16 is displaced by a quasi-static thermal change in length of the actuator 3, the movement is compensated by the damping member 25 by compressing the damping member 25 and pressing the valve closing body 18 via the valve needle flange 34 through the biasing spring 5 against the valve seat surface 19.
  • the invention is not limited to the exemplary embodiments shown, but can also be implemented with a large number of other designs of fuel injection valves 1.

Landscapes

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

Abstract

L'invention concerne une soupape d'injection de carburant (1), en particulier une soupape d'injection pour installations d'injection de carburant de moteurs à combustion interne, qui est constituée d'un actionneur (3) piézo-électrique ou magnétostrictif et d'un obturateur de soupape (18) qui peut être actionné, au moyen d'un pointeau de soupape (17), par l'actionneur (3) et qui coopère avec une surface de siège de soupape (19) pour créer une zone étanche. Pour la compensation de la dilatation thermique, ladite soupape est pourvue d'au moins un organe d'amortissement (25a, 25b) constitué d'une matière solide qui présente, lorsque la vitesse de déformation est élevée, un comportement presque statique, et qui peut être, lorsque la vitesse de déformation est faible, déformée élastiquement ou plastiquement.
EP00972607A 1999-10-02 2000-09-29 Soupape d'injection de carburant Withdrawn EP1135597A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19947779A DE19947779A1 (de) 1999-10-02 1999-10-02 Brennstoffeinspritzventil
DE19947779 1999-10-02
PCT/DE2000/003452 WO2001025613A1 (fr) 1999-10-02 2000-09-29 Soupape d'injection de carburant

Publications (1)

Publication Number Publication Date
EP1135597A1 true EP1135597A1 (fr) 2001-09-26

Family

ID=7924456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00972607A Withdrawn EP1135597A1 (fr) 1999-10-02 2000-09-29 Soupape d'injection de carburant

Country Status (6)

Country Link
US (1) US6814314B1 (fr)
EP (1) EP1135597A1 (fr)
JP (1) JP2003511603A (fr)
CZ (1) CZ20011887A3 (fr)
DE (1) DE19947779A1 (fr)
WO (1) WO2001025613A1 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10057495B4 (de) * 2000-11-20 2005-08-04 Siemens Ag Injektorgehäuse mit einer Aktoreinheit
ITBO20010280A1 (it) 2001-05-08 2002-11-08 Magneti Marelli Spa Iniettore di carburante con attuatore piezoelettrico
DE10212152A1 (de) * 2002-03-19 2003-12-04 Bosch Gmbh Robert Brennstoffeinspritzventil
EP1413743B1 (fr) * 2002-10-22 2007-09-12 Siemens VDO Automotive S.p.A. Buse d'injection de carburant
DE60304842T2 (de) * 2003-05-30 2006-09-07 Siemens Vdo Automotive S.P.A., Fauglia Thermisch kompensierter piezoelektrischer Aufbau
DE10345203A1 (de) * 2003-09-29 2005-05-04 Bosch Gmbh Robert Brennstoffeinspritzventil
JP4002229B2 (ja) * 2003-10-03 2007-10-31 株式会社日立製作所 燃料噴射弁
DE102004028885A1 (de) * 2004-06-15 2006-01-05 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102004046095B4 (de) * 2004-09-23 2018-02-15 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102004050224A1 (de) * 2004-10-15 2006-04-20 Robert Bosch Gmbh Aktormodul
DE102007023547B3 (de) * 2007-05-21 2008-06-26 Siemens Ag Verfahren und Vorrichtung zum Ermitteln einer Irreversibilität einer Längenänderung eines Piezokristalls
DE602007006816D1 (de) 2007-10-31 2010-07-08 Continental Automotive Gmbh Aktuatoranordnung und Einspritzventil
US20100044471A1 (en) * 2008-08-22 2010-02-25 Bircann Raul A Fuel injector with energy adsorbing pole
FR2947200B1 (fr) * 2009-06-25 2011-08-19 Prospection & Inventions Outil de pose d'elements de fixation a injecteur de combustible
FR2954963A1 (fr) * 2010-01-06 2011-07-08 Peugeot Citroen Automobiles Sa Amortisseur de vibrations et moteur comprenant un tel amortisseur
DE102015219568B4 (de) * 2015-10-09 2017-06-08 Continental Automotive Gmbh Aktuator mit Ventileinheit für piezoservobetriebenen Injektor
DE102015224554A1 (de) * 2015-12-08 2017-06-08 Robert Bosch Gmbh Dosiervorrichtung für ein elektrisch isolierendes Medium
JP7152274B2 (ja) * 2018-11-14 2022-10-12 株式会社Soken 燃料噴射装置
DE102019101717B3 (de) 2019-01-24 2020-07-09 Universität des Saarlandes Aktor

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
DE2931874C2 (de) * 1979-08-06 1983-08-04 Audi Nsu Auto Union Ag, 7107 Neckarsulm Elektrisch betätigbares Ventil
US5088467A (en) * 1984-03-05 1992-02-18 Coltec Industries Inc Electromagnetic injection valve
US4766405A (en) * 1987-04-14 1988-08-23 Allied Corporation Dynamic energy absorber
US5236173A (en) * 1992-03-11 1993-08-17 Siemens Automotive L.P. Armature bounce damper
DE19702066C2 (de) * 1997-01-22 1998-10-29 Daimler Benz Ag Piezoelektrischer Injektor für Kraftstoffeinspritzanlagen von Brennkraftmaschinen
DE19727992C2 (de) * 1997-07-01 1999-05-20 Siemens Ag Ausgleichselement zur Kompensation temperaturbedingter Längenänderungen von elektromechanischen Stellsystemen
GB9725804D0 (en) * 1997-12-06 1998-02-04 Lucas Ind Plc Fuel injector
DE19927900A1 (de) * 1999-06-18 2000-12-21 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19932763A1 (de) * 1999-07-14 2001-01-18 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19950779A1 (de) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Hochdruckkraftstoffinjektor mit hydraulisch gesteuertem Steuerschieber
US6382532B1 (en) * 2000-08-23 2002-05-07 Robert Bosch Corporation Overmold constrained layer damper for fuel injectors

Non-Patent Citations (1)

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Title
See references of WO0125613A1 *

Also Published As

Publication number Publication date
US6814314B1 (en) 2004-11-09
JP2003511603A (ja) 2003-03-25
DE19947779A1 (de) 2001-04-12
WO2001025613A1 (fr) 2001-04-12
CZ20011887A3 (cs) 2002-03-13

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