EP2021617B1 - Injecteur de carburant comportant une soupape de commande à compensation de pression - Google Patents

Injecteur de carburant comportant une soupape de commande à compensation de pression Download PDF

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Publication number
EP2021617B1
EP2021617B1 EP07727028A EP07727028A EP2021617B1 EP 2021617 B1 EP2021617 B1 EP 2021617B1 EP 07727028 A EP07727028 A EP 07727028A EP 07727028 A EP07727028 A EP 07727028A EP 2021617 B1 EP2021617 B1 EP 2021617B1
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EP
European Patent Office
Prior art keywords
armature
fuel injector
valve
injector according
valve seat
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.)
Active
Application number
EP07727028A
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German (de)
English (en)
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EP2021617A1 (fr
Inventor
Nadja Eisenmenger
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
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2021617A1 publication Critical patent/EP2021617A1/fr
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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine according to the preamble of claim 1, such as in WO 03/002868 or EP 1319827 Tide.
  • An injector for injecting fuel into a combustion chamber of an internal combustion engine, in which an injection valve member is actuated via a solenoid-operated control valve is for example off EP-A 1612 403 known.
  • a flow restrictor from a control room in the fuel return can be closed or released.
  • the control chamber is bounded on one side by a control piston with which an injection valve member is actuated, which releases or closes at least one injection opening into the combustion chamber of the internal combustion engine.
  • the outlet throttle is received in a body, which is provided on the side facing away from the control chamber with a tapered valve seat.
  • a closing element is adjustable, which is connected to the armature of the solenoid valve.
  • an edge is formed on the closing element, which is provided against the conically shaped seat.
  • the closing element moves on an axial rod, which is integrally connected to the body in which the drainage throttle is formed.
  • an injection valve member for releasing and closing at least one injection port by a solenoid valve trained control valve controlled.
  • a sealing surface is formed, which is adjustable for closing the control valve in a valve seat.
  • the armature of the solenoid valve is movable without an armature guide between an upper and a lower stroke stop.
  • Characterized in that the sealing surface is formed on the armature, which is adjustable for closing the control valve in the valve seat, can be dispensed with an additional closing element, as provided in the prior art. This minimizes the mass of moving components. By minimizing the mass of the moving components, shorter switching times can be realized.
  • Another advantage of forming the sealing surface directly at the armature of the solenoid valve is that the solenoid valve thereby requires little space.
  • a liquid-tight closure of the solenoid valve by the sealing surface is placed on the anchor in the valve seat, is achieved by the fact that the sealing surface is aligned with the anchor on the lower stroke stop.
  • This alignment takes place in a preferred embodiment by means of a resilient guide lip, which is formed on the armature.
  • the guide lip is preferably formed on the outer diameter of the armature. If the anchor begins to wobble during the closing movement, the anchor will first strike with the guide lip. In the further movement is characterized in that the guide lip is designed resiliently, the armature aligned so that the sealing surface rests flat on the valve seat and thus a liquid-tight connection is generated.
  • the movement of the armature in the lower stroke stop is carried out by means of a spring element.
  • the spring element is preferably a helical spring designed as a compression spring.
  • the inner diameter of the spring element preferably corresponds substantially to the inner diameter of the valve seat. Due to the elasticity of the resilient guide lip is achieved that is lost to this little of the spring force of the spring element.
  • the guide lip and the sealing surface on the armature and the stop surface and the valve seat of the control valve are ground to the same height.
  • the upper stroke stop is preferably formed by an annular surface.
  • the armature is designed so that the respective opposite surfaces on which an axial compressive force acts are the same size and are acted upon by the same pressure.
  • the anchor is a Run bore whose diameter corresponds substantially to the inner diameter of the valve seat.
  • a push rod is received in the bore.
  • the bore is honed in a preferred embodiment.
  • the push rod and the bore are made in a tight leadership game.
  • the abutment surface for the resilient guide lip and the valve seat are formed on a valve piece. This is accommodated in the injector housing. By forming the abutment surface and the valve seat on the valve piece, it is possible to produce them on an outer surface. It is not necessary to just grind an end face of a hole.
  • the spring force of the spring element by which the movement of the armature is supported by the magnet in the valve seat, is preferably adjusted by a disc. This is done by the spring element is biased by the disc. The larger the axial extent of the disc, the stronger the spring element is biased and the greater the spring force acting on the anchor.
  • the disc is arranged on the side facing away from the armature of the spring element. In a preferred embodiment, however, the disc is arranged between the spring element and the armature. Advantage of this arrangement is that the disc with which the spring force is adjusted, so can be used in addition to the centering of the armature.
  • the push rod in another embodiment comprises a pressure pin and a bolt, wherein the bolt is received in the bore in the armature and the pressure pin is enclosed by the spring element.
  • the tilting is avoided in particular by the fact that the bolt is tiltable relative to the pressure pin. This is achieved, for example, in that the mutually facing ends of the pressure pin and the bolt are crowned, ie preferably in the form of a spherical section.
  • any further, known in the art design is possible, with which the bolt can be bent relative to the pressure pin from the axial alignment.
  • FIG. 1 shows a section of an inventively designed fuel injector with solenoid valve in a first embodiment.
  • a control piston 2 with which an injection valve member, not shown here, is actuated is actuated by a solenoid valve 3. At least one injection opening is released or closed by the injection valve member, thus controlling the injection of fuel into a combustion chamber of an internal combustion engine.
  • the movement of the control piston 2 takes place hydraulically.
  • the control piston 2 opens with the side facing away from the injection valve member in a control chamber 4.
  • the control chamber 4 is connected to a fuel inlet 6.
  • fuel under system pressure can flow into the control chamber 4.
  • the outlet throttle 7 with an in FIG. 1 not shown return hydraulically connected.
  • the outlet throttle 7 can be closed by means of the solenoid valve 3.
  • a sealing surface 8 which is formed on the armature 9 of the solenoid valve 3, placed in a valve seat 10.
  • the sealing surface 8 and the valve seat 10 form a flat seat.
  • any further, known in the art valve seat in which no axial forces acting on the closing element.
  • a bore 11 is formed in the armature 9, in which a pressure rod 12 is received. So that no axial pressure forces act on the armature 9 when the valve is closed, the diameter of the bore 11 is substantially equal to the inner diameter of the sealing surface 8.
  • Another object of the push rod 12 is to seal the bore 11 against leakage currents. For this reason, it is necessary that the push rod 12 and the bore 11 are made in a close guide play. Compared with the known from the prior art fuel injectors, however, it is not necessary to manufacture the bore 11 and the sealing surface 8 on the armature 9 in a clamping in order to obtain a precise rectangular alignment of the sealing surface 8 and 9 hole. As a result, the manufacture of the armature 9 is simplified.
  • the upper stroke stop of the armature 9 is formed by an annular surface 14, which is designed as a lower end face of a Hubanschlaghülse 15.
  • a bore 16 is formed in the Hubanschlagshülse 15, in which a spring element 17 is received.
  • the spring element 17 is preferably designed as a compression spring coil spring which is supported on one side of the armature 9 and the other side on a disc 18.
  • the disc 18 is placed against an end face 19 of the bore 16. By means of the axial extent of the disc 18, the spring force can be adjusted, with which the spring element 17 acts on the armature 9.
  • the solenoid valve 3 comprises a magnet 20 which is accommodated in a magnetic core 21.
  • the support of the elastic guide lip 13, which rests on the support surface 22 and the sealing surface 8 ground on the armature 9 to a height.
  • the stroke of the armature 9 is limited by the Hubanschlaghülse 15.
  • the armature 9 and the magnetic core 21 are enclosed by a sleeve 23, by the axial extent of the stroke is determined.
  • To adjust the stroke is the Hubanschlaghülse 15 with an end face 24 on the sleeve 23 on this.
  • valve piece 25 which is received in the injector 26.
  • a bore 29 is formed in this for each pin 28.
  • the pins 28 are each surrounded by a lower disc 30, an upper disc 31 and an intermediate sealing ring 32.
  • the inventively embodied solenoid valve 3 can be used both inversely controlled fuel injectors as well as not inversely controlled fuel injectors.
  • the magnet 20 of the solenoid valve 3 is energized in a non-inversely controlled fuel injector. Not inverted means that when energized magnet 20, the at least one injection port is released and fuel is injected into the combustion chamber of the internal combustion engine.
  • a magnetic field is formed, through which the armature 9 is attracted by the magnet 20 and thus moves in the direction of the magnet 20.
  • the sealing surface 8 of the armature 9 lifts out of the valve seat 10 and a connection from the control chamber 4 via the outlet throttle 7 in the return, not shown here is released. Due to the released connection, fuel can drain from the control chamber 4. This leads to a pressure drop in the control chamber 4.
  • the stroke of the armature 9 is limited by the Hubanschlaghülse 15 by the armature 9 abuts against the annular surface 14 of the Hubanschlaghülse 15.
  • An axial guidance of the armature 9 is effected by an extension 34 on the armature 9, which is guided in the bore 16 of the Hubantschhülse 15.
  • the holes 16 and the extension 34 are not mating ground on anchor 9, so that despite the small stroke, generally in the range between 0.02 to 0.04 millimeters, a tumbling of the armature 9 is not can be prevented.
  • the resilient guide lip 13 is formed on the armature 9. Due to the resilient guide lip 13, the armature 9 is prevented from tilting even when the spring force of the spring element 17 acts unevenly on the armature. If there is a tilting of the armature 9, the resilient guide lip 13 abuts against the support surface 22 and thereby prevents further tilting of the armature. 9
  • An inversely controlled fuel injector differs from the non-inversely controlled fuel injector in that, when the magnet is energized, the at least one injection opening is closed and the at least one injection opening is released when the magnet is not energized.
  • the control piston 2 and the injection valve member are coupled to each other hydraulically, which is lifted in a movement of the control piston 2 in the direction of the injection valve member from the seat and the at least one injection opening releases and is energized with energized magnet of the control piston 2 in the direction of the control chamber 4 , whereby the injection valve member is placed in its seat and closes the at least one injection opening.
  • FIG. 2 is a second embodiment of an inventively designed solenoid valve 3 is shown.
  • the FIG. 2 illustrated embodiment differs from the in FIG. 1 illustrated embodiment in that a disc 35, with which the spring force of the spring element 17 is adjusted, is received between the spring element 17 and the armature 9.
  • the spring element 17 is supported with one side against the disc 25 and with the other side against the end face 19 of the bore 16.
  • the centering of the armature 9 is required so that it does not move radially and so the sealing surface 8 is no longer placed on the armature 9 on the valve seat 10 when the outlet throttle 7 is closed.
  • FIG. 3 shows a solenoid valve 3 in a third embodiment.
  • the push rod 12 comprises a bolt 36 and a pressure pin 37.
  • the bolt 36 is guided in the bore 11 in the armature 9.
  • the push rod 12 includes the pressure pin 37 and the bolt 36, it is avoided that the armature 9 can tilt on the push rod 12 when it begins to wobble due to uneven application of force by the spring element 17.
  • the bolt 36 and the pressure pin 37 are designed so that the bolt 36 can tilt over the pressure pin 37 from the axial direction.
  • at least either the pressure pin 37 on the side facing the bolt 36 or the bolt 36 on the side facing the pressure pin 37 is preferably provided with a crowned end face.
  • having a spherical design means that the end face is designed in the form of a spherical segment, a paraboloid or a hyperboloid.
  • both the end face of the pressure pin 37 facing the pin 36 and the end face of the pin 36 facing the pressure pin 37 are crowned.
  • a ball is received between the bolt 36 and the pressure pin 37.
  • the ball performs the same task as the spherically shaped facing end faces of the bolt 36 and the pressure pin 37th
  • Task of the push rod 12 is in all three embodiments, as shown in the Figure 1 to 3 are shown to absorb axial compressive forces.
  • the push rod 12 is supported against the end face 19 of the bore 16 in the Hubanschlaghülse 15.
  • the pressure force exerted on the push rod 12 is transmitted to the Hubanschlagshülse 15.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Claims (10)

  1. Injecteur de carburant pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, dans lequel un organe de soupape d'injection est commandé pour ouvrir et fermer une ouverture d'injection à travers une soupape de commande réalisée sous forme d'électrovanne (3), et un induit (9) de l'électrovanne peut être déplacé entre une butée de levage supérieure et une butée de levage inférieure, une surface d'étanchéité (8) réalisée sur l'induit (9) coopérant avec un siège de soupape (10) pour la fermeture de la soupape de commande, caractérisé en ce que l'induit (9) présente un alésage (11) qui correspond essentiellement au diamètre intérieur du siège de soupape (10), et dans lequel est guidée étroitement une tige de pression (12), de sorte que la tige de pression (12) reçoive les forces de pression axiales agissant.
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce qu'une lèvre de guidage élastique (13) est réalisée sur l'induit (9), laquelle repose au niveau de la butée de levage inférieure sur une face d'appui (22) de sorte que l'induit (9) soit aligné.
  3. Injecteur de carburant selon la revendication 2, caractérisé en ce que la lèvre de guidage (13) et la surface d'étanchéité (8) au niveau de l'induit (9) ainsi que la face d'appui (22) et le siège de soupape (10) de la soupape de commande sont meulés à la même hauteur.
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la butée de levage supérieure est formée par une surface annulaire (14).
  5. Injecteur de carburant selon l'une quelconque des revendications 2 à 4, caractérisé en ce que la surface d'appui (22) et le siège de soupape (10) sont réalisés sur une pièce de soupape (25).
  6. Injecteur de carburant selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la force de ressort d'un élément de ressort (17), qui facilite le déplacement de l'induit (9) par des aimants (20) dans le siège de soupape (10), est ajustée par une rondelle (18).
  7. Injecteur de carburant selon la revendication 6, caractérisé en ce que la rondelle (18) est reçue entre l'induit (9) et l'élément de ressort (17) et est ainsi insérée en vue du centrage de l'induit (9) .
  8. Injecteur de carburant selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la tige de pression (12) comprend une goupille de pression (37) et un boulon (36), le boulon (36) étant reçu dans un alésage (11) dans l'induit (9) et la goupille de pression (37) étant entourée par l'élément de ressort (17).
  9. Injecteur de carburant selon la revendication 8, caractérisé en ce que les extrémités tournées l'une vers l'autre du boulon (36) et de la goupille de pression (37) sont réalisées sous forme bombée.
  10. Injecteur de carburant selon la revendication 8, caractérisé en ce qu'une bille est reçue entre le boulon (36) et la goupille de pression (37).
EP07727028A 2006-05-10 2007-03-19 Injecteur de carburant comportant une soupape de commande à compensation de pression Active EP2021617B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006021736A DE102006021736A1 (de) 2006-05-10 2006-05-10 Kraftstoffinjektor mit druckausgeglichenem Steuerventil
PCT/EP2007/052550 WO2007128612A1 (fr) 2006-05-10 2007-03-19 Injecteur de carburant comportant une soupape de commande à compensation de pression

Publications (2)

Publication Number Publication Date
EP2021617A1 EP2021617A1 (fr) 2009-02-11
EP2021617B1 true EP2021617B1 (fr) 2011-11-23

Family

ID=38157536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07727028A Active EP2021617B1 (fr) 2006-05-10 2007-03-19 Injecteur de carburant comportant une soupape de commande à compensation de pression

Country Status (8)

Country Link
US (1) US8371516B2 (fr)
EP (1) EP2021617B1 (fr)
JP (2) JP5054762B2 (fr)
CN (1) CN101490405B (fr)
AT (1) ATE534815T1 (fr)
DE (1) DE102006021736A1 (fr)
RU (1) RU2451821C2 (fr)
WO (1) WO2007128612A1 (fr)

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DE102007025961A1 (de) * 2007-06-04 2008-12-11 Robert Bosch Gmbh Injektor
DE102007044361A1 (de) 2007-09-17 2009-03-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102007044362A1 (de) * 2007-09-17 2009-03-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102007047425A1 (de) 2007-10-04 2009-04-09 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102007052361A1 (de) * 2007-11-02 2009-05-07 Robert Bosch Gmbh Elastischer Sitz für Schaltventile
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DE102008040637A1 (de) * 2008-07-23 2010-01-28 Robert Bosch Gmbh Kraftstoffeinspritzventileinrichtung
DE102009029116A1 (de) * 2009-09-02 2011-03-03 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102009045335A1 (de) * 2009-10-05 2011-04-07 Robert Bosch Gmbh Injektor
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DE102010001486A1 (de) * 2010-02-02 2011-08-04 Robert Bosch GmbH, 70469 Steuerventilanordnung eines Kraftstoffinjektors
JP5637009B2 (ja) * 2011-02-24 2014-12-10 株式会社デンソー インジェクタ
JP5637008B2 (ja) * 2011-02-24 2014-12-10 株式会社デンソー インジェクタ
JP2013174158A (ja) * 2012-02-24 2013-09-05 Nabtesco Corp 電磁弁
DE102012221543A1 (de) * 2012-11-26 2014-05-28 Robert Bosch Gmbh Ventileinrichtung
DE102014225293A1 (de) 2014-12-09 2016-06-09 Robert Bosch Gmbh Kraftstoffinjektor
DE102015202726A1 (de) * 2015-02-16 2016-08-18 Robert Bosch Gmbh Steuerventilanordnung
DE102016225580A1 (de) * 2016-12-20 2018-06-21 Robert Bosch Gmbh Einrichtung zur Zumessung eines gasförmigen Brennstoffs zu einem Injektor
DE102016225946A1 (de) * 2016-12-22 2018-06-28 Robert Bosch Gmbh Kraftstoffinjektor und dessen Verwendung
US11466652B2 (en) * 2017-06-14 2022-10-11 Cummins Inc. Fuel injector having a self-contained replaceable pilot valve assembly
CN109488772B (zh) * 2018-11-30 2019-12-03 北京理工大学 一种喷射电磁阀的双密封结构

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RU2451821C2 (ru) 2012-05-27
DE102006021736A1 (de) 2007-11-15
JP5783947B2 (ja) 2015-09-24
WO2007128612A1 (fr) 2007-11-15
JP2012137097A (ja) 2012-07-19
US8371516B2 (en) 2013-02-12
CN101490405A (zh) 2009-07-22
US20090159727A1 (en) 2009-06-25
JP2009536288A (ja) 2009-10-08
JP5054762B2 (ja) 2012-10-24
CN101490405B (zh) 2012-04-18
RU2008148287A (ru) 2010-06-20
EP2021617A1 (fr) 2009-02-11
ATE534815T1 (de) 2011-12-15

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