EP1766225B1 - Injecteur "common rail" - Google Patents

Injecteur "common rail" Download PDF

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Publication number
EP1766225B1
EP1766225B1 EP05749713.3A EP05749713A EP1766225B1 EP 1766225 B1 EP1766225 B1 EP 1766225B1 EP 05749713 A EP05749713 A EP 05749713A EP 1766225 B1 EP1766225 B1 EP 1766225B1
Authority
EP
European Patent Office
Prior art keywords
injector
actuator
nozzle needle
combustion chamber
chamber
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
EP05749713.3A
Other languages
German (de)
English (en)
Other versions
EP1766225A1 (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 EP1766225A1 publication Critical patent/EP1766225A1/fr
Application granted granted Critical
Publication of EP1766225B1 publication Critical patent/EP1766225B1/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
    • 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 common rail injector according to the preamble of patent claim 1.
  • a control of an injector is referred to, in which the actuator is energized in retirement and is de-energized to open. In the de-energized state, the volume of the actuator decreases, so that the pressure in the control chamber decreases and lifts the nozzle needle from its seat. When the actuator is energized again, then closes the nozzle needle.
  • Conventional common rail injectors with direct and inverse control of the nozzle needle are complicated and require a relatively large amount of space.
  • a fuel injector is known with an actuator, which is in operative connection with an actuator piston, which with a first guide gap is guided.
  • the actuator piston is connected via a pressure medium in operative connection with a reciprocating piston, which is guided in a second guide gap.
  • a hydraulic device for transmitting an actuator movement with a transmission element is known, which establishes an operative connection between the actuator and an actuator.
  • a fuel injection valve with a hydraulic coupler which has a master piston and a slave piston.
  • the object of the invention is to provide a common rail injector according to the preamble of patent claim 1, which is simple in design and inexpensive to produce.
  • a common rail injector having the features of patent claim 1.
  • a stop for the coupler sleeve is created in a simple manner.
  • a direct control of the pressure in the control chamber is understood to mean the generation of a pressure drop and / or a pressure increase in the control chamber as a result of a deformation or a change in the volume of the actuator.
  • the combination according to the invention of a control chamber limiting sleeve with a coupler enables a compact solution without additional components, such as intermediate disks.
  • the sizes of the inner diameter of the nozzle needle guide portion and the Aktor Implementationsabites are chosen so that only a relatively small extension of the actuator for controlling the nozzle needle movement is required. This provides the advantage that relatively short actuators can be used.
  • a preferred embodiment of the injector is characterized in that the retaining disc is arranged in an annular space between the injector body and the actuator, which forms the fuel inlet, wherein the retaining plate has at least one through hole extending in the axial direction.
  • the through-hole allows the passage of high-pressure fuel supplied from the high-pressure fuel source.
  • a further preferred embodiment of the injector is characterized in that the nozzle needle is guided only in a nozzle body. Due to the simple structure of the injector according to the invention further guidance of the nozzle needle in the injector is not required.
  • a further preferred embodiment of the injector is characterized in that the coupler sleeve is supported at its combustion chamber remote end in the axial direction of the injector. This prevents the coupler sleeve from moving away from the combustion chamber in the injector housing.
  • the support on the injector housing is preferably designed so that a movement of the Coupler sleeve to the combustion chamber is possible. This simplifies assembly.
  • a further preferred embodiment of the injector is characterized in that the nozzle body, for example by means of a clamping nut, is braced against an injector body having an Aktorabilityraum in which a shoulder is formed, on which the coupler sleeve is supported.
  • the shoulder forms a stop for the coupler sleeve in the axial direction.
  • a further preferred embodiment of the injector is characterized in that the coupler sleeve is biased by a spring means in the axial direction against the injector.
  • the spring device serves to position the coupler sleeve in the idle state of the injector, that is to say, if no injection takes place, in particular on the shoulder of the actuator accommodating space.
  • Another preferred exemplary embodiment of the injector is characterized in that the end of the spring device close to the combustion chamber is supported on the nozzle needle.
  • the spring device has two functions. On the one hand, it serves to position the coupler sleeve.
  • the spring device has the function of a nozzle spring, through which the nozzle needle is pressed in the resting state of the injector against its seat.
  • Another preferred exemplary embodiment of the injector is characterized in that the end of the spring device close to the combustion chamber is supported on a spring plate, which in turn is supported on a shoulder which is formed on the nozzle needle. As a result, an easy-to-install attack surface for the spring device is created on the nozzle needle.
  • a further preferred embodiment of the injector is characterized in that the actuator and the coupler sleeve are subjected to high pressure.
  • the actuator and the coupler sleeve float in the common rail pressure, which is above the fuel inlet provided by the high-pressure fuel source.
  • the accompanying figure shows an embodiment of a common rail injector according to the invention in longitudinal section.
  • the illustrated common rail injector has a generally designated 1 injector.
  • the injector housing 1 comprises a nozzle body 2, which projects with its lower free end into the combustion chamber of the internal combustion engine to be supplied. With its upper, combustion chamber remote end face of the nozzle body 2 is clamped by means of a clamping nut 3 axially against an injector 4.
  • an axial guide bore 6 is recessed.
  • a nozzle needle 8 is guided displaceably.
  • a sealing edge 10 is formed, which cooperates with a sealing seat or with a sealing surface 11 which is formed on the nozzle body 2.
  • a spray hole 13 in the nozzle body 2 is closed.
  • the nozzle needle tip 9 with the Sealing edge 10 lifts from its sealing seat 11, then injected with high pressure fuel from the injector 1 through the injection hole 13 or more injection holes in the combustion chamber of the internal combustion engine is injected.
  • the nozzle needle 8 has a frustoconical widening portion, which is followed by a pressure chamber portion 16, which has substantially the shape of a circular cylinder.
  • the sections 15 and 16 of the nozzle needle 8 are arranged in a pressure chamber 17, which is formed in the nozzle body 2.
  • the pressure chamber section 16 is followed by a guide section 18, through which the nozzle needle 8 is guided in the axial guide bore 6 in the nozzle body 2.
  • at least one flattening 20 is provided in the nozzle needle 8, via which the pressure chamber 17 is supplied with high-pressure fuel.
  • the combustion chamber distal end of the nozzle needle 8 has the shape of a circular cylinder which is guided in a sealing manner in a nozzle needle guide portion 26 of a coupler sleeve 28.
  • a step in the radial direction is formed to the outside, from the combustion chamber away an Aktor Operationssabterrorism 30 goes out.
  • the Aktor Resultssabites 30 has a larger inner diameter than the nozzle needle guide portion 26.
  • the combustion chamber near end 32 of an actuator 34 is performed in a sealing manner.
  • the actuator 34 is a piezoelectric actuator, in the energized state has a greater length or in the longitudinal direction has a larger volume than in the de-energized state.
  • the holding plate 38 is supported radially on the outside on a shoulder 36, which is formed in the injector body 4. Through the shoulder 36, a combustion chamber-near axial portion of the injector body 4 is separated from a combustion chamber remote axial portion of the injector body 4, which has a smaller inner diameter than the combustion chamber near section.
  • a shoulder 40 Radially outside a shoulder 40 is formed on the coupler sleeve 28, which separates a combustion chamber distant axial portion of a combustion chamber near the axial portion of the coupler sleeve 28, which has a smaller outer diameter than the combustion chamber remote section.
  • the combustion chamber remote end of a preloaded helical compression spring 41 At the shoulder 40 is the combustion chamber remote end of a preloaded helical compression spring 41, the combustion chamber near the end rests against a spring plate 43.
  • the helical compression spring 41 is thus clamped between the shoulder 40 of the coupler sleeve 28 and the spring plate 43, which is supported in the axial direction on a collar 44 of the nozzle needle 8.
  • the collar 44 is arranged in the axial direction between the flattening 20 and the combustion chamber remote end 24 of the nozzle needle 8.
  • the combustion chamber remote end 24 of the nozzle needle 8 protrudes into a central receiving space 46, which is formed at the combustion chamber remote end of the nozzle body 2 and has a larger inner diameter than the axial guide bore 6.
  • the central receiving space 46 merges into an actuator receiving space 49, which is formed at the end of the injector body 4 close to the combustion chamber and has the same inner diameter as the central receiving space 46.
  • the collar 44, the spring plate 43, the helical compression spring 41, the coupler sleeve 28, the combustion chamber remote end 24 of the nozzle needle 8 and the combustion chamber near end 32 of the actuator 34 are arranged ,
  • Aktorfactraum 49 opens a fuel inlet 50, which has substantially the shape of an annular space formed between the actuator 34 and the injector body 4.
  • the fuel inlet 50 is connected via a connecting line (not illustrated) to a central high-pressure fuel source outside the injector housing 1. From the fuel inlet 50 high-pressure fuel passes through at least one through hole 51, which is provided in the retaining washer 38, in the Aktorfactraum 49 and the central receiving space 46. From the central receiving space 46 of the high-pressure fuel passes the flattening 20 over in the pressure chamber 17th
  • Coupler sleeve 28 Between the combustion chamber facing the end face of the actuator 34 and the combustion chamber facing away from the end face of the nozzle needle 8 is within the Coupler sleeve 28 defines a control chamber 52, via the pressure of the opening and closing of the nozzle needle 8 is controlled. At rest, that is, when no injection occurs because the tip 9 of the nozzle needle 8 abuts with its sealing edge 10 on the sealing seat 11, the actuator 34 is energized. In the energized state, the actuator 34 displaces with its end 32 a larger volume in the control chamber 52 than in the de-energized state.
  • the piezoelectric actuator 34 is quasi retracted with its end 32 due to the piezoelectric effect or the reverse piezoelectric effect, that is moved away from the combustion chamber.
  • the volume of the control chamber 52 increases, whereby the pressure in the control chamber 52 decreases.
  • the pressure difference in the control chamber 52 between the energized and the de-energized state of the actuator 34 causes the nozzle needle 8 lifts due to the pressure prevailing in the pressure chamber 17 high pressure with its tip 9 and the sealing edge 10 of the associated sealing seat 11, so that fuel off the pressure chamber 17 is injected through the injection hole 13 into the combustion chamber of the engine to be supplied.

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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 (8)

  1. Injecteur Common Rail avec un boîtier d'injecteur (1), qui présente une arrivée de carburant (50), qui est en communication avec une source centrale de haute pression de carburant à l'extérieur du boîtier d'injecteur et avec une chambre de pression (17) à l'intérieur du boîtier d'injecteur, hors duquel, en fonction de la pression dans une chambre de commande (52), du carburant soumis à une haute pression est injecté dans une chambre de combustion d'un moteur à combustion interne, lorsqu'un pointeau (8) se soulève de son siège (11), dans lequel la pression dans la chambre de commande (52) est commandée par un actionneur (34), en particulier un piézo-actionneur, dans lequel l'extrémité (32), proche de la chambre de combustion, de l'actionneur (34) ou d'une tête d'actionneur prévue sur l'actionneur est guidée dans une section de guidage d'actionneur (30) d'une douille de couplage (28), qui présente un plus grand diamètre intérieur qu'une section de guidage de pointeau (26) de la douille de couplage (28), dans laquelle l'extrémité (24) du pointeau (8) éloignée de la chambre de combustion est guidée, caractérisé en ce que le corps de buse (2) est serré, par exemple à l'aide d'un écrou de serrage (3), contre un corps d'injecteur (4), qui présente une chambre de logement d'actionneur (49), dans laquelle est formé un épaulement (36) sur lequel la douille de couplage (28) est appuyée, dans lequel l'extrémité de la douille de couplage (28) éloignée de la chambre de combustion est appuyée sur un disque de retenue (38), qui s'appuie de nouveau sur l'épaulement (36) du corps d'injecteur (4).
  2. Injecteur selon la revendication 1, caractérisé en ce que la douille de couplage (28) est appuyée, à son extrémité éloignée de la chambre de combustion, en direction axiale sur le boîtier d'injecteur (1).
  3. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le pointeau (8) est guidé dans un corps de buse (2).
  4. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le disque de retenue (38) est disposé dans une chambre annulaire entre le corps d'injecteur (4) et l'actionneur (34), qui forme l'arrivée de carburant (50), dans lequel le disque de retenue (38) présente au moins un trou de passage (51), qui s'étend en direction axiale.
  5. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que la douille de couplage (28) est précontrainte en direction axiale contre le boîtier d'injecteur (1) au moyen d'un système à ressort (41).
  6. Injecteur selon la revendication 5, caractérisé en ce que l'extrémité du système à ressort (41) proche de la chambre de combustion est appuyée sur le pointeau (8).
  7. Injecteur selon la revendication 6, caractérisé en ce que l'extrémité du système à ressort (41) proche de la chambre de combustion est appuyée sur une rondelle élastique (43), qui s'appuie de nouveau sur un épaulement (44) qui est formé sur le pointeau (8).
  8. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que l'actionneur et la douille de couplage sont soumis à une haute pression.
EP05749713.3A 2004-07-01 2005-05-11 Injecteur "common rail" Not-in-force EP1766225B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004031790A DE102004031790A1 (de) 2004-07-01 2004-07-01 Common-Rail-Injektor
PCT/EP2005/052145 WO2006003048A1 (fr) 2004-07-01 2005-05-11 Injecteur 'common rail'

Publications (2)

Publication Number Publication Date
EP1766225A1 EP1766225A1 (fr) 2007-03-28
EP1766225B1 true EP1766225B1 (fr) 2015-11-04

Family

ID=34969141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05749713.3A Not-in-force EP1766225B1 (fr) 2004-07-01 2005-05-11 Injecteur "common rail"

Country Status (4)

Country Link
US (1) US7418949B2 (fr)
EP (1) EP1766225B1 (fr)
DE (1) DE102004031790A1 (fr)
WO (1) WO2006003048A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006008647A1 (de) * 2006-02-24 2007-08-30 Robert Bosch Gmbh Kraftstoffinjektor mit direktbetätigbarer Düsennadel und variabler Aktorhubübersetzung
DE102006036781A1 (de) 2006-08-07 2008-02-14 Robert Bosch Gmbh Injektor und zugehöriges Betriebsverfahren
DE102006049885A1 (de) * 2006-10-23 2008-04-24 Robert Bosch Gmbh Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen
DE102007001363A1 (de) * 2007-01-09 2008-07-10 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen
JP5051102B2 (ja) 2008-11-17 2012-10-17 株式会社日本自動車部品総合研究所 燃料噴射弁
DE102011084107A1 (de) * 2011-10-06 2013-04-11 Continental Automotive Gmbh Piezoelektrischer Aktuator
WO2017144766A1 (fr) * 2016-02-25 2017-08-31 Wärtsilä Finland Oy Procédé et ensemble de test permettant de déterminer le diamètre du siège de buse d'un injecteur de carburant

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306073C1 (de) 1993-02-26 1994-06-01 Siemens Ag Zumeßvorrichtung für Fluide
JP3861368B2 (ja) 1997-04-18 2006-12-20 日産自動車株式会社 エンジンの燃料噴射弁
DE19901711A1 (de) * 1999-01-18 2000-07-20 Bosch Gmbh Robert Brennstoffeinspritzventil und Verfahren zum Betreiben eines Brennstoffeinspritzventils
GB9905231D0 (en) * 1999-03-09 1999-04-28 Lucas Ind Plc Fuel injector
DE19915210A1 (de) * 1999-04-03 2000-10-05 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19962177A1 (de) 1999-12-22 2001-07-12 Siemens Ag Hydraulische Vorrichtung zum Übertragen einer Aktorbewegung
ES2280318T3 (es) 2000-07-18 2007-09-16 Delphi Technologies, Inc. Inyector de combustible.
DE10063260B4 (de) * 2000-12-19 2007-11-29 Robert Bosch Gmbh Brennstoffeinspritzventil mit einstellbarem Drall
DE10151688A1 (de) * 2001-10-19 2003-04-30 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10159749A1 (de) 2001-12-05 2003-06-12 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10213858A1 (de) * 2002-03-27 2003-10-30 Bosch Gmbh Robert Brennstoffeinspritzventil
JP2004019564A (ja) 2002-06-18 2004-01-22 Denso Corp 燃料噴射装置
DE10230089A1 (de) 2002-07-04 2004-01-15 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10232193A1 (de) 2002-07-16 2004-02-05 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10336327B4 (de) 2003-08-07 2016-03-17 Robert Bosch Gmbh Injektor für Kraftstoff-Einspritzsysteme von Brennkraftmaschinen, insbesondere von direkteinspritzenden Dieselmotoren
DE102004002299A1 (de) 2004-01-16 2005-08-04 Robert Bosch Gmbh Kraftstoffinjektor mit direkt angesteuertem Einspritzventilglied
DE102004037255B4 (de) * 2004-07-31 2016-06-09 Robert Bosch Gmbh Verfahren zum Betreiben einer Kraftstoffeinspritzvorrichtung insbesondere für ein Kraftfahrzeug

Also Published As

Publication number Publication date
DE102004031790A1 (de) 2006-01-26
WO2006003048A1 (fr) 2006-01-12
EP1766225A1 (fr) 2007-03-28
US20080029067A1 (en) 2008-02-07
US7418949B2 (en) 2008-09-02

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