EP2307699B1 - Vanne magnétique pour un injecteur de carburant et injecteur de carburant - Google Patents

Vanne magnétique pour un injecteur de carburant et injecteur de carburant Download PDF

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Publication number
EP2307699B1
EP2307699B1 EP09772227.6A EP09772227A EP2307699B1 EP 2307699 B1 EP2307699 B1 EP 2307699B1 EP 09772227 A EP09772227 A EP 09772227A EP 2307699 B1 EP2307699 B1 EP 2307699B1
Authority
EP
European Patent Office
Prior art keywords
solenoid valve
coil
fuel
magnet
valve according
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
EP09772227.6A
Other languages
German (de)
English (en)
Other versions
EP2307699A1 (fr
Inventor
Friedrich Howey
Dietrich Klauk
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2307699A1 publication Critical patent/EP2307699A1/fr
Application granted granted Critical
Publication of EP2307699B1 publication Critical patent/EP2307699B1/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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059

Definitions

  • the invention relates to a solenoid valve, in particular a servo valve, for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine according to the preamble of claim 1 and a fuel injector according to claim 11.
  • the from the DE 10 2004 013 239 A1 known fuel injector comprises a designed as a servo valve solenoid valve for controlling the fuel pressure in a control chamber of the fuel injector. Via the fuel pressure in the control chamber, a stroke movement of an injection valve element is controlled, with which an injection opening of the fuel injector is opened or closed.
  • the solenoid valve comprises a magnetic assembly having an electrical coil and a magnet armature which is displaced in the direction of the magnet assembly when the magnet assembly is energized and is spring-loaded in the closing direction when the magnet assembly is not energized by means of a valve closing spring.
  • the invention is therefore based on the object to propose an alternative solenoid valve, wherein in a simple manner at least one fuel return passage is provided with uncritical cross-sectional area. Furthermore, the object is to propose a fuel injector with a correspondingly optimized solenoid valve.
  • the invention is based on the idea to form at least one of the axial, in the prior art cross-section of a respective coil dome filled through holes in the magnetic core for the coil contact pins as fuel return passage through which fuel can flow in the direction of an injector return port with the solenoid valve open.
  • An embodiment is preferred in which both passage openings for the coil contact pins (connecting pins) are designed as fuel return passages, that is to say with a widened cross-section compared to the prior art, in order thus to achieve a symmetrical flow pattern.
  • the diameter-enlarged, fuel return passages forming through holes for the coil contact pins can be introduced into the magnet core at no extra cost, in particular can be pressed into a green compact for a subsequent sintering process.
  • This also has a positive effect on a possibly used for use pressing tool for the magnetic core, since this is more stable due to the larger compared to the prior art, to be produced fürgangsö Maschinensquerroughe.
  • the solenoid valve greater freedom to distribute the fuel return channel cross-section against a support body provided for the magnetic core bearing surface, with the result that the inner circumference of the support body can be narrower, ie designed with a smaller diameter.
  • At least one of the respective coil contact pin receiving through holes preferably all through holes, either completely disposed in a region radially outside the axial projection surface of the magnet armature, or from a region radially inward to radially outward in extends an area outside the axial projection surface of the armature.
  • a coil contact pin having a fuel return passage and forming a passage opening in a region radially outward of the axial projection surface of the stop disc is arranged or extends at least in a region radially outside this.
  • a maximum flow cross-section of the two fuel return passages is achieved by the through openings penetrated by a coil contact pin are guided radially outward to the outer periphery of the magnetic core, so that the partially closed by the passage openings fuel return passages are radially outwardly of the, in particular sleeve-shaped, carrier body limited.
  • the at least one passage opening forming the fuel return passage does not extend radially to the outer circumference of the magnetic core, so that the passage opening or the fuel return passage is bounded radially outwardly by the magnetic core.
  • the latter embodiment has the advantage that a circumferentially closed axial bearing surface for the magnetic core can be provided on the carrier body.
  • a coil mandrel is arranged in the penetrated by a coil contact pin through holes in which the associated coil contact pin is also partially received.
  • the coil dome preferably extends from the annular coil receiving in the axial direction and encapsulates the coil contact pin in sections.
  • the maximum circumferential extent of the at least one passage opening forming the fuel return passage at least approximately corresponds to the maximum circumferential extent of a winding dome assigned to it and passing through the passage opening.
  • a fuel return passage can be achieved with significantly lower circumferential extent, whereby a total of a larger contact surface of the magnetic core can be provided on the carrier body.
  • the cross-sectional area of the passageway can be adjusted by the choice of the radial extent of the passageway.
  • the minimum cross-sectional area of the at least one fuel return channel ie the cross-sectional area
  • the cross-sectional area is closest Range of the fuel return channel at least 8 mm 2 , in particular at least 9 mm 2 , preferably at least 10 mm 2 , more preferably at least 11 mm 2 , more preferably at least 12 mm 2 , so as to realize a generous outflow volume flow.
  • an embodiment of the solenoid valve is preferred in which the magnet armature does not abut directly on the magnet core, but on a stop disk (residual air disk) resting against the magnet core.
  • it makes sense to further divert the Ab Kunststoffmenge by at least one Spulentitlepin passage opening in the axial direction towards the injector return, since the stopper plate hydraulically obstructs a central through hole in the magnetic core usually open solenoid valve.
  • the axial contact surface of the magnetic core on the carrier body is greater than 30 mm 2 .
  • the carrier surface on which the magnetic core can be supported on the carrier body is formed by an inner annular shoulder of the carrier body.
  • the support surface is preferably greater than 40 mm 2 , preferably greater than 50 mm 2 , particularly preferably greater than 60 mm 2 .
  • the invention also leads to a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with a, in particular serving as a servo valve, designed according to the concept of the invention solenoid valve.
  • the solenoid valve is characterized in that at least one passage opening receiving a coil contact pin is formed as a fuel return passage. Both, each receiving a coil contact pin through openings are each formed as a fuel return passage.
  • no further axial fuel return passages are provided, through which fuel can flow in the direction of the injector return port from the side of the magnet core facing the magnet armature with the solenoid valve open.
  • Fig. 1 is an incomplete and schematic representation of a solenoid valve 1 for a non-illustrated, known per se, for example, as in the DE 10 2004 013 239 A1 trained, fuel injector for injecting fuel into a combustion chamber of an internal combustion engine shown.
  • the solenoid valve 1 serves as a servo valve, with which the fuel pressure in a control space, not shown, limited by an injection valve element is controllable. With the solenoid valve open, fuel can flow from the control chamber past a magnet armature 2 to an injector return port, not shown, arranged in the plane of the drawing above the solenoid valve 1.
  • the solenoid valve 1 comprises a magnet assembly 3, which is braced within the fuel injector, not shown.
  • the magnet assembly 3 comprises a sleeve-shaped carrier body 4 made of steel, which has a radially inner annular shoulder 5.
  • a magnetic core 6 is arranged, which is supported in the axial direction with an annular bearing surface formed by a participatpolabexcellent 7 on the one support surface for the magnetic core forming annular shoulder 5.
  • Radial distance to the technicallypolabterrorism 7 is an inner pole section 8.
  • Constantpolabites 7 and réellepolabites 8 are over a in the sectional view according to Fig. 1 invisible, annular yoke connected to each other.
  • the yoke portion, the brieflypolabites 7 and the mecanical ness of the armature 2 define a ringnutförmige Spulenausnaturalung 9, which is open in the direction of the armature 2.
  • an electric coil 10 solenoid coil
  • a magnetic field when energized, which causes an adjusting movement of the armature 2 in the direction of the magnet assembly 3.
  • the electrical coil 10 comprises a winding support 11 which carries a wound winding wire 13 in an axially lower, groove-shaped section 12. Further, in the winding support 11 two pointing in the axial direction coil contact pins 14, 15 anchored, which are contacted in a region axially above the winding support 11 to the winding wire 13 electrically. For this purpose, the coil contact pins 14, 15 are partially wrapped by the winding wire 13, wherein the wrapped areas of each of a copper sleeve 16, 17 (welding sleeves) are surrounded.
  • Each copper sleeve 16, 17 is arranged in a coil mandrel 18, 19, wherein the coil mandrels 18, 19 extend in the axial direction beyond the annular groove-shaped Spulenaus principleung 9 in the direction of the drawing plane up through later to be explained through holes 21, 22 therethrough.
  • Fig. 1 shows, the copper sleeves 16, 17 and the winding wires 13 are received in a Kunststoffvergussmasse 20 which closes the winding wires 13 fuel-tight and forms a main component of the coil mandrels 18, 19.
  • each coil contact pin 14, 15 is a previously mentioned, penetrated by a respective coil mandrel 18, 19, axial through hole 21, 22 assigned in the cup-shaped magnetic core 6 through which the respective coil contact pin 14, 15 is led out in the axial direction of the magnetic core 6.
  • Each axial passage opening 21, 22, which extends from an axially lower end side to an axially upper end side of the magnetic core 6, is formed in a radially outer region as a fuel return channel 23, 24, can flow through the fuel when the solenoid valve 1 is open in the plane of the drawing in the axial direction up to an injector return not shown.
  • the fuel thus flows with open solenoid valve 1 on the armature 2 in the axial direction over to the fuel return channels 23, 24 formed by the through holes 21, 22, which in the embodiment shown radially inward of the electric coil 10, in the circumferential directions of the magnetic core 6, more precisely from the outer pole section 7 and radially outwardly from the carrier body 4, are limited.
  • a valve closing spring 30 is accommodated, which is supported in the axial direction, for example, on a Injektordeckel (housing part), not shown, and in the axial direction down the stop plate 28 by itself on the magnet assembly 3 facing end face of the armature 2 is supported.
  • the fuel return passages 23, 24 extend from a radially inner portion which is radially within an axial, not shown projection surface of the armature plate portion 25 of the armature 2, to a radially outer region, the radially outward of said axial projection surface of the Anchor plate portion 25 of the armature is located.
  • Fig. 2 is the magnet assembly 3 according to Fig. 1 shown in a perspective view obliquely from below.
  • the central passage 29 which does not serve here as a fuel return passage.
  • the fuel return passages 23, 24 can be seen, which are bounded radially inward by the electric coil 10 and in the circumferential direction by the outer pole section 7.
  • the fuel return ducts 23, 24 are formed in each case by a passage opening 21, 22 in the magnet core 6 open at the edge.
  • the circumferential extent of the fuel return ducts 23, 24 substantially corresponds to the circumferential extent of the respective coil dome 18, 19. Only in the radial outward direction do the passage openings 21, 22 extend beyond the coil domes 18, 19.
  • the cross-sectional contour of the fuel return passages 23, 24 is formed substantially rectangular.
  • a pie-shaped (circular segment-shaped) formation can be realized.
  • Fig. 3 is an alternative embodiment of a magnetic assembly 3 for a solenoid valve 1 of a fuel injector shown in a view from below.
  • the central passage 29 of the radially outward of is limited to the réellepolabites 8, wherein radially between the inner pole portion 8 and a participatpolabites 7, an annular Spulenaus Principleung 9 is formed.
  • the electrical coil 10 is formed thickened at two offset in 180 ° to each other points.
  • the ones out Fig. 3 not visible coil contact pins 14, 15 and the associated coil dome 18, 19 arranged.
  • the thickened regions are accommodated in axial passage openings 21, 22 which form a fuel return passage 23, 24 radially outside the electrical coil 10 in each case.
  • the passage openings 21, 22 are not guided to the outer edge of the magnetic core 6, more precisely the outer pole section 7, but that the passage openings 21, 22 and thus the fuel return passages 23, 24 are bounded radially outwardly by the outer pole section 7 of the magnetic core 6 ,

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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)

Claims (9)

  1. Électrovanne, en particulier servovanne, pour un injecteur de carburant pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant un induit magnétique (2) qui peut être réglé par rapport à un module magnétique (3) qui présente un noyau magnétique (6) reçu dans un corps de support (4), qui présente, dans un évidement de bobine (9), une bobine électrique (10) présentant au moins deux broches de contact de bobine (14, 15), au moins deux ouvertures de passage (21, 22) étant réalisées sous forme de conduits de retour de carburant (23, 24) et les ouvertures de passage (21, 22) s'étendant radialement vers l'extérieur jusqu'à la périphérie extérieure du noyau magnétique (6) de telle sorte que les conduits de retour de carburant (23, 24) soient limités radialement à l'extérieur par le corps de support (4), caractérisée en ce qu'à chacune des broches de contact de bobine (14, 15) est associée l'une des ouvertures de passage (21, 22) traversant axialement le noyau magnétique (6).
  2. Électrovanne selon la revendication 1, caractérisée en ce qu'au moins l'une des ouvertures de passage (21, 22) est disposée dans une région radialement à l'extérieur de la surface en projection axiale de l'induit magnétique (2), ou au moins l'une des ouvertures de passage (21, 22) s'étend jusque dans une région radialement à l'extérieur de la surface en projection axiale de l'induit magnétique (2).
  3. Électrovanne selon la revendication 1, caractérisée en ce qu'à chaque broche de contact de bobine (14, 15) est associé un mandrin de bobine (18, 19) reçu dans l'ouverture de passage correspondante (21, 22).
  4. Électrovanne selon la revendication 1, caractérisée en ce que l'étendue périphérique maximale de chaque ouverture de passage (21, 22) correspond au moins approximativement à l'étendue périphérique maximale du mandrin de bobine (18, 19) qui lui est associé.
  5. Électrovanne selon l'une quelconque des revendications précédentes, caractérisée en ce que la surface minimale en section transversale de l'au moins un conduit de retour de carburant (23, 24) formé par les ouvertures de passage (21, 22) vaut au moins 6 mm2, en particulier au moins 8 mm2, de préférence au moins 10 mm2, de préférence au moins 11 mm2, particulièrement préférablement au moins 12 mm2.
  6. Électrovanne selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un disque de butée (28), de préférence en un matériau non magnétique, est disposé axialement entre le module magnétique (3) et l'induit magnétique (2).
  7. Électrovanne selon l'une quelconque des revendications précédentes, caractérisée en ce que la surface de butée axiale du noyau magnétique (6) contre le corps de support (4) est supérieure à 30 mm2, en particulier supérieure à 40 mm2, de préférence supérieure à 50 mm2, particulièrement préférablement supérieure à 60 mm2 .
  8. Électrovanne selon l'une quelconque des revendications précédentes, caractérisée en ce que le contour périphérique interne de chaque conduit de retour de carburant (23, 24) est au moins approximativement rectangulaire.
  9. Injecteur de carburant pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant une électrovanne (1), en particulier réalisée sous forme de servovanne, selon l'une quelconque des revendications précédentes.
EP09772227.6A 2008-07-04 2009-05-05 Vanne magnétique pour un injecteur de carburant et injecteur de carburant Not-in-force EP2307699B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810040168 DE102008040168A1 (de) 2008-07-04 2008-07-04 Magnetventil für einen Kraftstoff-Injektor sowie Kraftstoff-Injektor
PCT/EP2009/055375 WO2010000527A1 (fr) 2008-07-04 2009-05-05 Vanne magnétique pour un injecteur de carburant et injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2307699A1 EP2307699A1 (fr) 2011-04-13
EP2307699B1 true EP2307699B1 (fr) 2017-01-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09772227.6A Not-in-force EP2307699B1 (fr) 2008-07-04 2009-05-05 Vanne magnétique pour un injecteur de carburant et injecteur de carburant

Country Status (3)

Country Link
EP (1) EP2307699B1 (fr)
DE (1) DE102008040168A1 (fr)
WO (1) WO2010000527A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013113781A1 (fr) 2012-02-03 2013-08-08 Basf Se Composés de pyrimidine fongicides i
WO2013113776A1 (fr) 2012-02-03 2013-08-08 Basf Se Composés de pyrimidine fongicides
JP2015508752A (ja) 2012-02-03 2015-03-23 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ 殺菌性ピリミジン化合物
WO2013113719A1 (fr) 2012-02-03 2013-08-08 Basf Se Composés de pyrimidine fongicides ii
WO2013113788A1 (fr) 2012-02-03 2013-08-08 Basf Se Composés de pyrimidine fongicides
WO2013113782A1 (fr) 2012-02-03 2013-08-08 Basf Se Composés de pyrimidine fongicides
IN2014DN07220A (fr) 2012-02-03 2015-04-24 Basf Se
WO2013113716A1 (fr) 2012-02-03 2013-08-08 Basf Se Composés de pyrimidine fongicides
WO2013113773A1 (fr) 2012-02-03 2013-08-08 Basf Se Composés fongicides de pyrimidine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19619523A1 (de) * 1996-05-15 1997-11-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Hochdruckeinspritzung
JP3669425B2 (ja) * 2000-09-28 2005-07-06 株式会社デンソー コイル装置
JP4062221B2 (ja) * 2003-09-17 2008-03-19 株式会社デンソー 電磁アクチュエータ、電磁アクチュエータの製造方法、および燃料噴射弁
DE102004013239B4 (de) 2004-03-18 2015-10-01 Robert Bosch Gmbh Magnetventil mit einstellbarem Ankerhub und Verfahren zur Einstellung desselben
EP1612400B1 (fr) * 2004-06-30 2008-03-19 C.R.F. Società Consortile per Azioni Méthode pour fabriquer un injecteur de carburant pour un moteur à combustion interne et injecteur fabriqué selon la méthode
DE102006061946B4 (de) * 2006-12-29 2014-06-05 Robert Bosch Gmbh Brennstoffeinspritzventil

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Publication number Publication date
EP2307699A1 (fr) 2011-04-13
WO2010000527A1 (fr) 2010-01-07
DE102008040168A1 (de) 2010-01-07

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