EP2002111B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2002111B1
EP2002111B1 EP07726342A EP07726342A EP2002111B1 EP 2002111 B1 EP2002111 B1 EP 2002111B1 EP 07726342 A EP07726342 A EP 07726342A EP 07726342 A EP07726342 A EP 07726342A EP 2002111 B1 EP2002111 B1 EP 2002111B1
Authority
EP
European Patent Office
Prior art keywords
actuator
preload
pressure
fuel injector
coupler
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.)
Not-in-force
Application number
EP07726342A
Other languages
German (de)
English (en)
Other versions
EP2002111A2 (fr
Inventor
Thomas Pauer
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 EP2002111A2 publication Critical patent/EP2002111A2/fr
Application granted granted Critical
Publication of EP2002111B1 publication Critical patent/EP2002111B1/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
    • 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
    • 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

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • Fuel injectors in which a piezoelectric actuator is coupled to the nozzle needle without the interposition of a control valve are known and are referred to as fuel injectors with directly controlled nozzle needle.
  • Such a fuel injector is out EP 1 111 230 A2 known, in which a piezoelectric actuator acts on a nozzle needle via a hydraulic coupler, wherein the piezoelectric actuator is biased by a tube spring. On the piezoelectric actuator acts another biasing element, which is formed by a compression spring and spring diaphragms.
  • WO 2005/050002 A1 is another fuel injector with a directly controlled nozzle needle known in which also acts the piezoelectric actuator via a hydraulic coupler on a nozzle needle.
  • the hydraulic coupler is limited by two sleeves, the one sleeve with a spring element at the same time biases the piezoelectric actuator.
  • a second spring element acts, which serves as a closing spring for the nozzle needle and thereby exerts no biasing force on the piezoelectric actuator.
  • the fuel injector is provided with an injector housing having a high fuel pressure inlet communicating with a central fuel high pressure source external to the injector housing and with a pressure space within the injector housing from which pressurized fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle opens which is coupled by a hydraulic coupler directly, without the interposition of a control valve, with an actuator, wherein the actuator is biased by a defined biasing force acting in the same direction as and greater than the compressive force, which at a relatively low operating pressure of the hydraulic coupler acts on the actuator.
  • the actuator is preferably a piezoactuator.
  • the hydraulic coupler serves to translate the stroke and / or force of the actuator.
  • the high pressure provided by the high-pressure fuel source operating can vary between a relatively high and a relatively low pressure level and is referred to as operating pressure.
  • the object of the invention is to improve the injection behavior of a fuel injector with respect to the response at low operating pressures.
  • At least one biasing element is biased parallel to the actuator, is applied by at least a portion of the biasing force to the actuator.
  • a coupler piston is provided, which is biased by a further biasing member against the actuator, is applied by the at least part of the biasing force to the actuator.
  • the further biasing element is clamped between the coupler piston and a sealing sleeve, which limits a coupler space.
  • the biasing forces of the biasing member and the further biasing member are coordinated so that the actuator is biased by a defined biasing force that is greater than the pressure force, which acts at a relatively low operating pressure from the hydraulic coupler to the actuator.
  • a preferred embodiment of the fuel injector is characterized in that the biasing force is 500 to 800 newtons. This biasing force range has proven to be particularly advantageous in the context of the present invention.
  • Another preferred embodiment of the fuel injector is characterized in that the actuator is disposed within a hollow biasing member. This has the advantage that only little space is required for the biasing element.
  • a further preferred embodiment of the fuel injector is characterized in that the biasing element comprises a spring sleeve.
  • the spring sleeve is preferably formed from spring steel and provided with a plurality of recesses.
  • Another preferred embodiment of the fuel injector is characterized in that the biasing element is biased between two cover plates of the actuator to train. Consequently, the actuator is stressed by the biasing element between the cover plates to pressure, so compressed.
  • the coupler piston defines on one side a coupler space which is bounded on the opposite side of the nozzle needle.
  • the coupler room can also be subdivided into several sub-coupling spaces, which are in communication with each other.
  • a further preferred embodiment of the fuel injector is characterized in that the further biasing element is biased to pressure parallel to the coupler piston.
  • This biasing elements is for example a helical compression spring.
  • Another preferred embodiment of the fuel injector is characterized in that the sealing sleeve is guided at one end of the coupler piston.
  • the attached figure shows a simplified representation of a fuel injector in longitudinal section.
  • FIG. 1 a fuel injector with an injector 1 is shown in longitudinal section.
  • the injector housing 1 comprises a nozzle body 2, which projects with its lower free end into a combustion chamber of an internal combustion engine to be supplied with fuel. With its upper end remote from the combustion chamber, the nozzle body 2 is clamped axially against an intermediate body 3 and an injector body 4 by means of a clamping nut (not shown).
  • the injector body 4 has substantially the shape of a circular-cylinder jacket-shaped sleeve, whose one end face is closed by the intermediate body 3.
  • an axial guide bore 6 is recessed, in which a nozzle needle 8 is guided axially displaceable.
  • a sealing edge 10 is formed, which cooperates with a sealing seat or a sealing surface 11 to selectively release or close two spray holes 13 and 14 depending on the position of the nozzle needle 8.
  • the nozzle needle 8 has a pressure chamber portion 15, followed by an expanding portion 16, which is also referred to as a pressure shoulder.
  • the pressure shoulder is arranged in a pressure chamber 17 which is formed between the nozzle needle 8 and the nozzle body 2.
  • On the pressure shoulder 16 is followed by a guide portion 18 which is guided in the guide bore 6 movable back and forth.
  • a fluid connection between the pressure chamber 17 and a nozzle spring chamber 22 is provided.
  • the nozzle spring chamber 22 communicates via a connecting channel (not shown) with an actuator chamber 25, which in turn is connected via an inlet channel or a feed line 26 to a high-pressure fuel source, which is also referred to as a common rail.
  • the fuel injector is actuated by a piezoelectric actuator 30.
  • the piezoelectric actuator 30 is coupled with the interposition of a compensation element 31, which is preferably made of ceramic, mechanically coupled to a coupler piston 32 whose combustion chamber near end face bounds a partial coupling space 34 in the axial direction.
  • partial coupling space 30 In the radial direction of the partial coupling space 30 is limited by a sealing sleeve 35, which is guided on the coupler piston 32 and biased by a compression spring 36 which is supported on a collar 37 of the coupler piston 32.
  • the partial coupling space 34 communicates with a further partial coupling space 40 via a connecting channel 38, which may be equipped with a throttle.
  • the guide portion 18 of the nozzle needle 8 is bounded away from the combustion chamber by a collar 44, from which the combustion chamber remote end 45 of the nozzle needle 8 goes out.
  • a sealing sleeve 48 is guided, which limits the partial coupling space 40 in the radial direction. Between the sealing sleeve 48 and the collar 44, a nozzle spring 60 is clamped.
  • the piezoelectric actuator 30 is disposed between two cover plates 71 and 72, which are held together by a biasing member 74 under bias. As a result, the piezoactuator 30 arranged therebetween is subjected to pressure, that is to say compressed.
  • the compression spring 36 which is also referred to as Aktor réellefeder is clamped under pretension between the collar 37 and the sealing sleeve 35 so that it acts alternatively or additionally as a biasing element for the piezoelectric actuator 30.
  • the high pressure acting in the fuel injector is also referred to as rail pressure.
  • the high pressure acts on the combustion chamber remote end face of the nozzle needle 8.
  • the piezoelectric actuator 30 is charged in the idle state of the fuel injector and has its maximum longitudinal extent. To actuate the fuel injector, the piezoelectric actuator 30 is discharged and retracts. The pressure in the sub-coupling spaces 34 and 40 drops off and the nozzle needle opens, that is, lifts off from its nozzle needle seat.
  • a needle stop is provided for limiting the stroke.

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 de carburant comprenant un boîtier d'injecteur (1), qui présente une amenée de carburant haute pression (26), qui est en liaison avec une source de carburant haute pression centrale en dehors du boîtier d'injecteur (1) et avec un espace de pression (17) à l'intérieur du boîtier d'injecteur (1), hors duquel du carburant sollicité par la pression de travail est injecté dans une chambre de combustion d'un moteur à combustion interne lorsqu'une aiguille de buse (8) s'ouvre, laquelle est accouplée par un coupleur hydraulique à un actionneur (30), au moins un élément de précontrainte (74) étant précontraint parallèlement à l'actionneur (30), au moins une partie de la force de précontrainte étant appliquée à l'actionneur (30) par cet élément de précontrainte (74), et le coupleur hydraulique comprenant un piston de coupleur (32) qui est précontraint contre l'actionneur (30) par un élément de précontrainte supplémentaire (36), par lequel au moins une partie de la force de précontrainte est appliquée à l'actionneur (30), caractérisé en ce que l'élément de précontrainte supplémentaire (36) est serré entre le piston de coupleur (32) et une douille d'étanchéité (35), qui limite un espace de coupleur (34), et en ce que les forces de précontraintes de l'élément de précontrainte (74) et de l'élément de précontrainte supplémentaire (36) sont adaptées l'une à l'autre de telle sorte que l'actionneur (30) soit précontraint par une force de précontrainte définie qui est supérieure à la force de pression qui agit sur l'actionneur (30) dans le cas d'une pression de travail relativement faible du coupleur hydraulique.
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la force de précontrainte vaut 500 à 800 Newton.
  3. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'actionneur (30) est disposé à l'intérieur d'un élément de précontrainte creux (74).
  4. Injecteur de carburant selon la revendication 3, caractérisé en ce que l'élément de précontrainte (74) comprend une douille à ressort.
  5. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'élément de précontrainte (74) est précontraint en traction entre deux plaques de recouvrement (71, 72) de l'actionneur (30).
  6. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'élément de précontrainte (36) ou l'élément de précontrainte supplémentaire (36) est précontraint en pression parallèlement au piston de coupleur (32).
EP07726342A 2006-03-28 2007-02-12 Injecteur de carburant Not-in-force EP2002111B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006014251A DE102006014251A1 (de) 2006-03-28 2006-03-28 Kraftstoffinjektor
PCT/EP2007/051320 WO2007110267A2 (fr) 2006-03-28 2007-02-12 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2002111A2 EP2002111A2 (fr) 2008-12-17
EP2002111B1 true EP2002111B1 (fr) 2010-05-12

Family

ID=38441577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07726342A Not-in-force EP2002111B1 (fr) 2006-03-28 2007-02-12 Injecteur de carburant

Country Status (4)

Country Link
EP (1) EP2002111B1 (fr)
AT (1) ATE467759T1 (fr)
DE (2) DE102006014251A1 (fr)
WO (1) WO2007110267A2 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19843570A1 (de) * 1998-09-23 2000-03-30 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19905413A1 (de) * 1999-02-10 2000-08-24 Bosch Gmbh Robert Injektor mit Piezo-Mehrlagenaktor für Einspritzsysteme
DE19912666A1 (de) * 1999-03-20 2000-09-21 Bosch Gmbh Robert Brennstoffeinspritzentil
DE19962177A1 (de) * 1999-12-22 2001-07-12 Siemens Ag Hydraulische Vorrichtung zum Übertragen einer Aktorbewegung
DE10039424A1 (de) * 2000-08-11 2002-02-28 Siemens Ag Dosierventil mit einem hydraulischen Übertragungselement
DE10352736A1 (de) * 2003-11-12 2005-07-07 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadeleinspritzung
DE102005046440B4 (de) * 2005-09-28 2007-07-19 Siemens Ag Spannfeder

Also Published As

Publication number Publication date
WO2007110267A2 (fr) 2007-10-04
DE102006014251A1 (de) 2007-10-04
WO2007110267A3 (fr) 2008-04-10
EP2002111A2 (fr) 2008-12-17
DE502007003736D1 (de) 2010-06-24
ATE467759T1 (de) 2010-05-15

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