EP2547895B1 - Kraftstoff-injektor - Google Patents

Kraftstoff-injektor Download PDF

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Publication number
EP2547895B1
EP2547895B1 EP11702983.5A EP11702983A EP2547895B1 EP 2547895 B1 EP2547895 B1 EP 2547895B1 EP 11702983 A EP11702983 A EP 11702983A EP 2547895 B1 EP2547895 B1 EP 2547895B1
Authority
EP
European Patent Office
Prior art keywords
armature
magnet
fuel injector
injection valve
armatures
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
EP11702983.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2547895A1 (de
Inventor
Oliver Rain
Marco Beier
Roman Etlender
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 EP2547895A1 publication Critical patent/EP2547895A1/de
Application granted granted Critical
Publication of EP2547895B1 publication Critical patent/EP2547895B1/de
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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1:
  • Such a fuel injector is from the post-published DE 10 2008 042 227 A1 or the DE 10 2007 002758 A1 the applicant known.
  • the known fuel injector is used for injecting fuel into a combustion chamber of an internal combustion engine and has a pin-shaped injection valve member which is arranged via a coupler space in operative connection with a magnet armature.
  • the coupler space serves as a force translator, which translates a movement of the magnet armature into a movement of the injection valve member in order to open or close injection openings on the housing of the fuel injector.
  • the present invention seeks to further develop a fuel injector according to the preamble of claim 1 such that the magnet armature on the one hand applies the required opening force for lifting the injection valve member from its seat and on the other hand, the injection valve member has a relatively large Hub can perform.
  • the size or the cost of the armature should be relatively low.
  • the invention is based on the idea, by at least two magnet armature movable relative to each other, which protrude with their end faces in the coupler space, the force transferable from the magnetic coil to the magnet armature force on the two armature such that a first armature substantially for lifting the injection valve member is responsible for its seat, while the other armature allows the required, relatively large stroke of the injection valve member.
  • the at least two armature are arranged concentrically to each other.
  • the at least two armature are formed rotationally symmetrical. As a result, in particular, a relatively inexpensive production of the magnetic tankers is made possible.
  • the end faces projecting into the coupler space the armature have a different size.
  • the desired opening behavior can be influenced or controlled by varying the size.
  • the end face of the inner armature has a smaller area than the end face of the outer magnet armature. Characterized a relatively large wall thickness of the outer Gurgnetkern Schemes is achieved in a concentric design of the armature, in particular, which can be relatively easily realized manufacturing technology.
  • the outer armature forms a guide for the inner armature.
  • a secure guidance of the inner magnet armature is made possible with a compact design.
  • the armature are each formed as a flat armature.
  • Such flat anchors have the advantage of being able to achieve relatively large tightening forces.
  • the disadvantage here, however, is that the physically meaningful stroke is limited due to the design.
  • the outer armature is designed as a flat armature and the inner armature as a solenoid plunger.
  • a plunger anchor has a relatively large Lift up.
  • the achievable stroke of the inner Magentankers can be maximized.
  • both magentankers as plunger anchors, so that particularly large strokes can be achieved on both magnet anchors.
  • the inner armature forms a stop element for the outer armature in the opening direction of the injection valve member.
  • a common rail injector fuel injector 10 for injecting fuel into a combustion chamber 11 of an internal combustion engine, not shown.
  • the fuel injector 10 has a high pressure port 12, to which a supply line 13 is connected.
  • a supply line 13 of the fuel injector 10 among other fuel injectors, not shown with under high pressure (rail pressure) of, for example, over 2000bar standing fuel from a high-pressure accumulator 15 (Rail) supplied.
  • the high pressure accumulator 15 in turn is supplied from a reservoir 16 (tank) with the aid of a preferably designed as a radial piston pump high pressure pump 17 with fuel.
  • the high-pressure port 12 opens into a first pressure chamber 18, which is filled with substantially standing under rail pressure fuel.
  • the first pressure chamber 18 is formed in a housing 20 of the fuel injector 10.
  • a blind hole 22 is formed in the housing 20.
  • the blind hole 22 extends from the first pressure chamber 18 and extends to the combustion chamber 11 of the engine facing the end of the fuel injector 10.
  • the blind hole 22 extends at its end facing the combustion chamber 11 to a second pressure chamber 24.
  • 24 nozzle holes 25 are formed in the region of the second pressure chamber, via which the second pressure chamber 24 injects fuel into the combustion chamber 11 of the internal combustion engine.
  • a pin-shaped injection valve member 27 is slidably guided whose combustion chamber 11 facing end is formed enlarged in diameter and which forms a sealing seat 29 with a conical surface 28 with a wall portion of the second pressure chamber 24 in the closed position of the injection valve member 27.
  • a longitudinal bore 31 is formed as a blind hole, which opens via a transverse bore 32 in a first, formed in the housing 20 annular space 33.
  • the first annular space 33 is connected via a connecting bore 34 with the first pressure chamber 18.
  • a second annular space 35 in the housing 20 is formed.
  • the second annular space 35 has a relief bore 36 with a throttle arranged therein connection 37 with the low-pressure region of the injection system, in particular with the reservoir 16th
  • the injection valve member 27 has on the first pressure chamber 18 side facing a portion 38 of reduced diameter. In the region of section 38, the injection valve member 27 is partially surrounded by a compression spring 39, which is supported on an end face 41 of the longitudinal bore 31 and the force applied to the injection valve member 27 in the direction of the sealing seat 39.
  • the compression spring chamber 42 in which the compression spring 39 is arranged, is further coupled via a transverse bore 43 with the connecting bore 34 and thus is also substantially under high pressure (rail pressure).
  • the blind hole 22, in which the injection valve member 27 is guided, has on the side facing the first pressure chamber 18 a diameter enlarged first bore portion 46.
  • the first bore section 46 merges into a second bore section 47 with a reduced diameter relative to the first bore section 46 in which the section 38 of the injection valve member 27 is guided.
  • a magnet armature assembly 49 is arranged in the first pressure chamber 18.
  • the armature assembly 49 is part of a Magnetaktors 50, which cooperates with the magnet armature assembly 49 magnetic core 51 with centrally disposed through hole 52 and embedded in the magnetic core 51 magnetic coil 53.
  • the magnet armature assembly 49 can be moved in the direction of the arrow 54, thereby allowing opening of the injection valve member 27.
  • the armature assembly 49 has two cooperating, rotationally symmetrical magnet armature 55 and 56 in Flachankerbau way.
  • the second magnet armature 56 concentrically surrounding the first magnet armature 55 has a disc-shaped region 57 which merges into a sleeve-shaped or pin-shaped region 58 on the side facing the injection valve member 27.
  • the area 58 dips into the first bore section 46.
  • a through hole 59 is formed in the longitudinal axis of the second armature 56.
  • the through-hole 59 serves to guide a pin-shaped portion 61 of the inner, first magnet armature 55, which on the side facing away from the injection valve member 27 has a disk-shaped portion 62 in a form-fitting adapted recess 63 of the disk-shaped portion 57 of the second, outer armature 56 to form a radially encircling air gap 68 is received.
  • a coupler space 70 is formed.
  • the coupler space 70 filled with high-pressure fuel serves to transmit a movement of the two magnet armatures 55, 56 into a corresponding movement of the injection valve member 27.
  • the end face 66 of the inner armature 55 is smaller than the end face 67 of the injection valve member 27 form, so as to allow a greater force transmission in a movement of the inner Magentankers 55. Since the volume of the coupler space 70 remains constant during a movement of the magnet armatures 55, 56, this means that due to the different sizes of the end faces 66 and 67, a relatively large stroke of the inner magnet armature 55 is translated into a relatively small stroke of the injection valve member 27.
  • the inner magnet armature 55 When the magnet coil 53 is energized, the inner magnet armature 55 initially moves in the direction of the arrow 54, while the outer magnet armature 56 remains at rest for the first time. As soon as the injection valve member 27 lifts off from its sealing seat 29, the outer magnet armature 56 also moves in the direction of the magnet coil 53, whereby a relatively large subsequent stroke of the injection valve member 27 in the opening direction takes place due to the relatively large area of the end face 65 (in comparison to the end face 66) , Thus, after the successful lifting of the injection valve member 27 from the sealing seat 29 due to the movement of the inner armature 55 by means of the outer magnet armature 56 can generate a relatively large stroke of the injection valve member 27.
  • Fig. 3 is one opposite the Fig. 1 and 2 modified embodiment of the invention shown.
  • the outer magnet armature 56a on the side facing the magnetic coil 53 at its outer region has a radial encircling step 71.
  • a first return spring 74 is supported between the step 71 and the opposite end face of the magnetic core 51.
  • the first return spring 74 thus pushes the outer armature 56a in the direction of the injection valve member 27.
  • the inner armature 55a has a pin-like extension 72, which passes through the through hole 52 of the magnetic core 51.
  • the extension 72 On the side facing away from the injection valve member 27 side of the inner armature 55a is followed by the extension 72 to a plate-shaped region 73, on which a second return spring 75 acts.
  • the inner armature 55a is also subjected to force in the direction of the injection valve member 27, the plate-shaped portion 73, when it rests against the injection valve member 27 opposite side of the magnetic core 51, a stroke limiter for the inner armature 55a in the direction of the injection valve member 27th formed.
  • a larger stroke can be realized on the outer magnet armature 56a than on the inner magnet armature 55a.
  • Fig. 4 are views of a further modified embodiment of the invention shown. It is essential here that the outer magnet armature 56b in its disk-shaped region 76 in the exemplary embodiment has four longitudinal slots 77 offset by 90 ° from one another, into which sections 78 of the inner magnet armature 55b, which are arranged in cross-section in a generally cross-shaped manner. The portions 78 are formed on a pin-shaped portion 79 of the inner armature 55b, which is guided in a through hole of the outer magnetic core 56b. The sections 78 and the disc-shaped region 76 are arranged opposite a (not shown) magnetic coil. That in the Fig.
  • a magnet armature assembly 80 is shown in which an outer armature 81 in Flachankerbauweise a disc-shaped portion 82 and a projecting into the portion 46, pin-shaped portion 83 has.
  • a first bore portion 84 of relatively large diameter and a second bore portion 85 is formed with respect to the bore portion 84 of reduced diameter.
  • the formed as a through hole second bore portion 85 is used together with the first bore portion 84 of the guide of an inner armature 86 in Tauchankerbau way.
  • the pin-shaped inner armature 86 which projects partially into the magnetic core 51 c, is provided on the opposite side of the coupler chamber 70 with a Hubbegrenzungselement 87, which cooperates with a first return spring 88, the force is applied to the inner armature 86 in the direction of the coupler space 70.
  • the first bore section 84 of the outer magnet armature 81 has a connection bore 89 to connect to the first pressure chamber 18 or can be connected to high-pressure fuel.
  • This solution has the advantage that the dimensioning or design of the two end faces 65c, 66c of the two magentankers 81, 86 can be made more independent of the magnetic circuit design, since the hydraulic forces in the transition region between the two bore sections 84, 85 are reduced via the space 90 ,
  • a Hubbegrenzungselement 91 is provided, which is designed as a collar on the inner armature 92, and which cooperates with a return spring 93.
  • the inner armature 92 except for the Hubbegrenzungselements 91, a pin-shaped or cylindrical shape.
  • the outer armature 94 in contrast to the embodiment according to the Fig. 5 no connection hole 89 formed.
  • the outer armature 95 is subjected to a force in the direction of the injection valve member 27 by means of a compression spring 96.
  • the inner armature 97 has a pin-shaped extension 98 which cooperates with a Hubbegrenzungscopy 99 outside of the magnetic core 51.
  • the Hubbegrenzungsusion 99 is subjected to force by means of a compression spring 100, so that via the compression spring 100 on the one hand, the inner magnetic core 97 in the direction of the injection valve member 27 is subjected to force, on the other hand, however, a limitation of the adjustment of the inner magnetic core 97 in the direction of the injection valve member 27 is effected.
  • the magnetic circuit can be influenced.
  • the characteristic curve of the inner magnet armature 97 by a corresponding geometric dimensioning of the extension 98.
  • the outer, designed in Tauchankerbau way armature 101 is sleeve-shaped and protrudes with its upper half into the region of the magnetic coil 102 inside. Further, it has a circumferential collar 103, between which and a front surface of the magnetic core 104, a compression spring 105 is supported. The compression spring 105 thus presses the outer armature 101 in the direction of the injection valve member 27, wherein the movement of the outer armature 101 in the direction of the injection valve member 27 is limited by the circumferential collar 103.
  • a cylindrical, also designed in Tauchankerbauweise inner armature 108 is disposed within the outer armature 101.
  • the inner armature 108 has on the side facing away from the injection valve member 27 a preferably made of non-magnetic material, designed as a separate component extension 109 which has a Hubbegrenzungsteller 110 outside of the magnetic core 104, on which a return spring 111 is supported, the inner armature 108th in the direction of the injection valve member 27 force. Due to the geometric design of the magnetic core 104 and the magnetic cores 101 and 108, the forces on the armature 101, 108 can be adapted to the requirements. The forces on the outer armature 101 are determined mainly by the compression spring 105 and the magnetic flux 112. On the other hand, forces on the inner armature 108 are substantially determined by the return spring 111 and the magnetic flux 113. Due to the formation of the Federal Circuit 103 and the Hubbegrenzungstellers 110 can be independent strokes of the magenta tankers 101, 108 realize.
  • FIG. 9 illustrated embodiment of the invention differs from that in the Fig. 8 illustrated embodiment by an annular elevation 114 on the magnetic core 115, which is arranged in operative connection with the outer armature 101, to influence the characteristic of the outer magnet armature 101.
  • annular elevation 114 on the magnetic core 115 which is arranged in operative connection with the outer armature 101, to influence the characteristic of the outer magnet armature 101.
  • Fig. 10 illustrated embodiment of the invention differs from that in the Fig. 8 illustrated embodiment in the use of a Hubbegrenzungshunt 117 and a conically shaped portion 118 on the inner armature 108a, which dips into a corresponding stepped bore 119 of the magnetic core 104b. Due to the geometric configuration of the region 118 and the stepped bore 119, the characteristic curve of the inner magnet armature 108a can be influenced.
  • the magnet armature arrangements of the Fig. 2 to 10 can be modified or modified in a variety of ways as defined in the appended claims. This consists in the use of at least two mutually independently movable armature, which are arranged longitudinally movable relative to each other and cooperate via a coupler space with an injection valve member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP11702983.5A 2010-03-15 2011-02-04 Kraftstoff-injektor Not-in-force EP2547895B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010002845 DE102010002845A1 (de) 2010-03-15 2010-03-15 Kraftstoff-Injektor
PCT/EP2011/051628 WO2011113640A1 (de) 2010-03-15 2011-02-04 Kraftstoff-injektor

Publications (2)

Publication Number Publication Date
EP2547895A1 EP2547895A1 (de) 2013-01-23
EP2547895B1 true EP2547895B1 (de) 2014-09-10

Family

ID=43837896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11702983.5A Not-in-force EP2547895B1 (de) 2010-03-15 2011-02-04 Kraftstoff-injektor

Country Status (5)

Country Link
EP (1) EP2547895B1 (zh)
CN (1) CN102792003B (zh)
DE (1) DE102010002845A1 (zh)
RU (1) RU2555066C2 (zh)
WO (1) WO2011113640A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6186126B2 (ja) * 2013-01-24 2017-08-23 日立オートモティブシステムズ株式会社 燃料噴射装置
EP2863044B1 (en) * 2013-10-15 2016-06-29 Continental Automotive GmbH Injection valve
CN114151255B (zh) * 2021-11-19 2023-02-14 哈尔滨工程大学 电磁阀直驱喷油-增压双作用喷油器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1236140A1 (ru) * 1983-06-01 1986-06-07 Bukhvalov Vladimir V Электромагнитна форсунка
KR20010031761A (ko) * 1997-11-03 2001-04-16 디이젤 엔진 리타더스, 인코포레이티드 캐스케이드 전자 전기자
CN2761860Y (zh) * 2003-10-15 2006-03-01 中国第一汽车集团公司 电子控制喷油器
DE102004035280A1 (de) * 2004-07-21 2006-03-16 Robert Bosch Gmbh Kraftstoffinjektor mit direkter mehrstufiger Einspritzventilgliedansteuerung
DE102007002758A1 (de) * 2006-04-04 2007-10-11 Robert Bosch Gmbh Kraftstoffinjektor
DE102006020689A1 (de) * 2006-05-04 2007-11-08 Robert Bosch Gmbh Magnetventil mit stoffschlüssiger Ankerverbindung
DE102008042227A1 (de) 2008-09-19 2010-04-01 Robert Bosch Gmbh Kraftstoff-Injektor

Also Published As

Publication number Publication date
CN102792003A (zh) 2012-11-21
WO2011113640A1 (de) 2011-09-22
DE102010002845A1 (de) 2011-09-15
CN102792003B (zh) 2015-06-17
RU2555066C2 (ru) 2015-07-10
RU2012143687A (ru) 2014-04-20
EP2547895A1 (de) 2013-01-23

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