WO2015150183A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
WO2015150183A1
WO2015150183A1 PCT/EP2015/056373 EP2015056373W WO2015150183A1 WO 2015150183 A1 WO2015150183 A1 WO 2015150183A1 EP 2015056373 W EP2015056373 W EP 2015056373W WO 2015150183 A1 WO2015150183 A1 WO 2015150183A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide sleeve
needle guide
needle
fuel
nozzle
Prior art date
Application number
PCT/EP2015/056373
Other languages
German (de)
English (en)
Inventor
Michael Kurz
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
Priority to EP15712356.3A priority Critical patent/EP3126663A1/fr
Publication of WO2015150183A1 publication Critical patent/WO2015150183A1/fr

Links

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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention relates to a fuel! Njektor according to the preamble of
  • the problem with fuel injectors of the type in which a control volume serving for moving an injection member or a nozzle needle is not diverted into a low pressure region is, on the one hand, to provide a relatively high opening force for opening the injection member when the injection member is lifted from its sealing seat , And on the other hand, in order to achieve the largest possible flow volume through at least one injection port to continue to ensure the largest possible stroke of the injection member.
  • the known fuel injector has an armature coupled to the injection member via a hydraulic translator, wherein the provision of differently sized effective areas of the armature and of the translator in conjunction with stop surfaces, which the
  • the invention has the object, a fuel injector according to the preamble of claim 1 such that on the one hand for lifting the injector from its sealing seat the highest possible opening force is achieved, and that on the other hand with an open injection member the highest possible Flow is achieved by at least one injection port formed on the injector.
  • a nozzle needle is disposed radially within a needle guide sleeve, that the needle guide sleeve is raised and lowered arranged in the injector that the
  • Needle guide sleeve in a lowered position forms a sealing seat in the direction of at least one injection port and in a raised position releases a flow of fuel in the direction of at least one injection port, and that the needle guide sleeve has a blind hole-shaped receptacle for the nozzle needle, wherein provided at the bottom of the receptacle a discharge bore is, which is closable by means of the nozzle needle by forming a sealing seat, and which is hydraulically connected to the at least one injection port.
  • Wrkharm arranged with the armature injection member or the nozzle needle and the nozzle needle radially surrounding the needle guide sleeve.
  • Energizing the armature or for injecting fuel into the combustion chamber of an internal combustion engine is achieved by such a structural design, a two-stage release of at least one injection port in
  • Injector housing instead.
  • the nozzle needle is raised within the needle guide sleeve, including a relatively small, acting in opening action on the nozzle needle force sufficient.
  • a first injection of fuel takes place via the outflow bore formed at the base of the needle guide sleeve into the at least one injection opening.
  • This relatively small injection quantity can by the defined movement of the nozzle needle in the
  • Needle guide sleeve to be controlled very accurately.
  • the actual, relatively large flow rate through the at least one injection port is subsequently achieved in a further movement of the needle guide sleeve, in which the
  • High-pressure chamber of the injector in the direction of at least one
  • High-pressure chamber hydraulically connected control chamber, and from there via the outflow bore into the at least one injection port passes or flows.
  • control chamber is arranged radially within a control chamber sleeve, which guides the needle guide sleeve radially, and that on the side facing away from the needle guide sleeve of the control chamber sleeve of the control chamber is limited by a throttle plate. Furthermore, it can be provided that the needle guide sleeve completely within a recess of a nozzle body of the injector arranged. Such a training allows a relatively short or
  • the needle guide sleeve with a portion within a recess of a nozzle body of the
  • Nozzle needle formed within the nozzle body recess may have a smaller diameter relative to the first-mentioned structural design.
  • As a result (for a given outer diameter of the nozzle body) increased wall thicknesses of the nozzle body and thus better strength values are achieved.
  • the background to this is that in the area of
  • Düsen stresses existing pressures can be more than 2000bar, so that the nozzle body is due to its relatively small outer diameter critical in terms of strength component.
  • the stroke of the needle guide sleeve can be adjusted in the latter structural design characterized in that the throttle plate rests with the interposition of a dial on the nozzle body.
  • Injector housing is guided radially, and that the injection member in an axial region between the needle guide sleeve and the armature in the
  • Injector housing is guided radially in the region of a through hole.
  • a nozzle chamber is formed which is hydraulically connected via a throttle to the high-pressure chamber.
  • the throttle causes the reduced with increasing stroke of the needle guide sleeve
  • Needle guide sleeve so that when each fully raised nozzle needle and needle guide sleeve, the discharge hole is open.
  • the flow cross-section in the direction of the at least one injection opening is seen as a whole increased or it will be particularly large
  • FIG. 1 shows a first fuel injector according to the invention in one
  • FIG. 5 each in simplified longitudinal sections of the fuel! Njektor according to FIG.
  • the illustrated in FIGS. 1 to 5 first inventive fuel!
  • the injector 10 is part of a common-rail injection system for injecting fuel into the combustion chamber of a not shown, in particular self-igniting internal combustion engine.
  • the injector 10 has a multi-part injector housing 11 with a nozzle body 12 facing the combustion chamber of the internal combustion engine.
  • the nozzle body 12 is followed on the side facing away from the combustion chamber in the axial direction, a holding body 13 at.
  • Nozzle locknut is axially clamped to the holding body 13.
  • the nozzle body 12 has a blind hole-shaped recess 15 in the
  • the holding body 13 facing bore portion 16 has the largest diameter.
  • the bore section 18 in turn widens to the bore portion 19 forming a nozzle chamber 22, which in turn merges into the bore hole section 20 forming a blind bore 23. From the blind hole 23 go more, in the nozzle body 12 as
  • the holding body 13 has on the nozzle body 12 side facing a blind hole-shaped recess 26 which forms a high pressure chamber 28 together with the recess 15 in the nozzle body 12.
  • the high-pressure chamber 28 is connected via a supply bore, not shown in the figures, to a high-pressure source (rail) for the fuel.
  • a high-pressure source for the fuel.
  • Recess 26 a through hole 29 for the radial guidance of an injection member 30 at.
  • the through hole 29 is again in a further recess 31 of the holding body 13 via.
  • the injection member 30 is connected to a disk-shaped in the embodiment directly anchor 32.
  • the armature 32 is part of a Magnetaktuators, which includes an embedded in the wall of the holding body 13 coil 33.
  • the coil 33 surrounds an annular return body 34 which is flush with the inner wall of the
  • Recess 31 closes. Furthermore, the actuator comprises a magnetic core 35 in the form of an inner pole, which cooperates with the end face of the armature 32 facing away from the injection member 30. Between the two recesses 26 and 31, a through hole 36 is also formed in the holding body 13, which connects the two recesses 26, 31 hydraulically with each other.
  • the injection member 30 is formed within the high-pressure chamber 28 in the form of a nozzle needle 38.
  • the nozzle needle 38 is guided within the recess 15 of the nozzle body 12 radially within a needle guide sleeve 40.
  • the needle guide sleeve 40 has a blind hole-shaped bore 41 with a plurality of different diameter sections for receiving the nozzle needle 38. From the bottom of the bore 41 is an outflow bore in the form of a flow restrictor 42, which opens into the region of the blind hole 23.
  • the needle guide sleeve 40 is guided radially in the region of the guide region 21 of the recess 15 of the nozzle body 12 and arranged in the longitudinal axis 43 of the injection member 30 in the direction of the double arrow 44 raised and lowered.
  • the needle guide sleeve 40 On the side facing away from the outflow throttle 42, the needle guide sleeve 40 has a sealing portion 45 which is enlarged in diameter and which is enclosed radially by a control chamber sleeve 46.
  • the control chamber sleeve 46 is disposed within the bore portion 16 of the recess 15 and is located under the axial intermediate position of a spring element 48 at the transition region between the two bore sections 16, 17 on the nozzle body 12.
  • the spring element 48 is formed, for example, by means of its recess such that a hydraulic connection between the two bore sections 16, 17 is made possible.
  • in the guide area 21 is still a
  • Closing throttle 49 is formed, which forms a hydraulic connection between the bore portion 17 and the nozzle chamber 22.
  • the control chamber sleeve 46 rests axially on a throttle plate 50 on the side facing away from the spring element 48 with its end face.
  • the throttle plate 50 is disposed within the recess 26 of the holding body 13 and is located with the control chamber sleeve 46 facing end surface on the nozzle body 12 at. On the control chamber sleeve 46 facing away from the end face of the throttle plate 50, this is subjected to a force in the direction of the nozzle body 12 by a compression spring 51, which is supported on the bottom of the recess 26 of the holding body 13.
  • the throttle plate 50 still has an opening 52, which forms a hydraulic connection between the two recesses 15, 26 of the high-pressure chamber 28.
  • the injection member 30 is radially surrounded by a Aufpresshülse 54.
  • the Aufpresshülse 54 is connected via a closing spring 55 in the form of a compression spring, which is also at the bottom of the recess 26 of the
  • Holding body 13 is supported, in the direction of the injection openings 24th
  • the injection member 30 and the nozzle needle 38, together with the armature 32, as well as the needle guide sleeve 40, in the direction of the double arrow 44 can be raised and lowered.
  • the injection member 30 and thus also the nozzle needle 38 is acted upon by the closing spring 55 within the needle guide sleeve 40 in its lowered position, wherein the nozzle needle 38 to form a sealing seat 57 at the bottom the bore 41 hydraulically closes the outflow throttle 42.
  • the needle guide sleeve 40 is also in its lowered position, in which this in the region of
  • a control chamber 60 is limited, via an inlet throttle 61, in the
  • Throttle plate 50 is formed, is hydraulically connected to the high-pressure chamber 28.
  • Fig. 2 shows the fuel injector 10 shortly after the energizing of the (not shown) coil 33.
  • a magnetic force F M builds up in the magnetic core 35, so that the armature 32 is moved together with the nozzle needle 38 against the pressing force of the closing spring 55 in the direction of the magnetic core 35.
  • the nozzle needle 38 lifts off from its sealing seat 57 so that fuel is injected from the control chamber 60 via the outflow throttle 42 into the region of the blind bore 23, and from there via the injection openings 24 into the combustion chamber of the internal combustion engine.
  • the size of the flow cross-sections through the injection openings 24 are substantially larger than the total
  • Control chamber 60 outflowing fuel, the pressure decreases in the
  • FIG. 3 shows the state in which the armature 32 or the nozzle needle 38 has already reached its maximum raised position.
  • the needle guide sleeve 40 is moved further in the direction of the armature 32. It is essential that during this further movement until the needle guide sleeve 40 rests on the throttle plate 50 side facing the throttle plate 50, the needle guide sleeve 40 undergoes a continuous reduction of the opening force. This is due to the effect that initially in the blind bore 23 of the combustion chamber pressure prevails, which is relatively low. By a given vote of the outflow throttle 42 and the inlet throttle 61 in the throttle plate 50, a certain pressure in the control chamber 60, so that over the above-described area ratio acting on the needle guide sleeve 40 in the opening direction force relatively high is.
  • Opening direction slows down. To counteract this effect, which is strongest just before reaching the throttle plate 50, is located in the
  • the energization of the coil 33 is interrupted. Thereby, the magnetic force F M is degraded to the magnetic core 35, and the armature 32 is due to the force acting in the closing direction of the closing spring
  • Needle guide sleeve 40 their downward movement in the closing direction.
  • the rule here is that the resultant force F s acting in the closing direction is initially the lowest.
  • the force of the closing spring 55 affects the force of the closing spring 55, and on the other hand, the pressure drop on the surface A Sa , which by the
  • Closing throttle 49 is caused.
  • Needle guide sleeve 40 takes place between the needle guide sleeve 40 and the armature 32 and the nozzle needle 38, no relative movement, that is, the sealing seat 57 remains closed.
  • the closing process ends with the placement of the needle guide sleeve 40 on the nozzle body 12 with simultaneous formation of the other sealing seat 58th
  • Fuel injector 10a differs from the fuel injector 10 in that the control chamber sleeve 46 is not subjected to force by means of the spring element 48 in the direction of the throttle plate 50, but by means of a closing element designed as a compression spring 65.
  • Such a design has the advantage that the required magnetic force F M for lifting the nozzle needle 38 is reduced by its sealing seat 57.
  • the throttle plate 50a is disposed entirely within the holding body 13. This makes it possible to provide the recess 15b in the nozzle body 12b, in particular in the region of the original bore sections 16, 17 of the recess 15 according to FIG. 1, with a reduced diameter.
  • the throttle plate 50b has a blind hole-shaped receptacle 66 for a piston-shaped end 67 of the
  • a through hole 68 is formed, which connects the high-pressure chamber 28 hydraulically with the recess 15b. Furthermore, a section 70 of
  • Needle guide sleeve 40b which has a constant diameter, disposed within the recess 15b. To adjust the stroke of the
  • Needle guide sleeve 40b is between the throttle plate 50b and the
  • Nozzle body 12b a shim 69 is arranged.
  • Injectors 10, 10a and 10b can be modified or modified in many ways without deviating from the inventive concept.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant (10 ; 10a ; 10b), comprenant un boîtier d'injecteur (11) dans lequel est formée une chambre à haute pression (28), un élément d'injection (30) qui peut être soulevé et abaissé, qui est disposé dans le boîtier d'injecteur (11) et qui se présente sous la forme d'une aiguille d'injecteur (38) servant à libérer et fermer au moins indirectement au moins un orifice d'injection (24) ménagé dans le boîtier d'injecteur (11), et un induit (32) qui est fonctionnellement relié à l'élément d'injection (30) et qui fait partie d'un actionneur magnétique. Selon l'invention, l'élément d'injection (30) est disposé radialement à l'intérieur d'une douille de guidage d'aiguille (40 ; 40b), la douille de guidage d'aiguille (40 ; 40b) est disposé de façon à pouvoir être soulevée et abaissée dans le boîtier d'injecteur (11), la douille de guidage d'aiguille (40 ; 40b) forme dans une position abaissée un siège d'étanchéité (58) en direction d'au moins un orifice d'injection (24) et libère dans une position soulevée un flux de carburant en direction d'au moins un orifice d'injection (24), et la douille de guidage d'aiguille (40 ; 40b) comporte un logement (41) en forme de trou borgne destiné à l'aiguille d'injecteur (38), au fond du logement (41) étant ménagé un trou d'évacuation (42) qui peut être fermé au moyen de l'aiguille d'injecteur (38) en formant un siège d'étanchéité (57) et qui est relié hydrauliquement à l'au moins un orifice d'injection (24).
PCT/EP2015/056373 2014-04-01 2015-03-25 Injecteur de carburant WO2015150183A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15712356.3A EP3126663A1 (fr) 2014-04-01 2015-03-25 Injecteur de carburant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014206210.1A DE102014206210A1 (de) 2014-04-01 2014-04-01 Kraftstoffinjektor
DE102014206210.1 2014-04-01

Publications (1)

Publication Number Publication Date
WO2015150183A1 true WO2015150183A1 (fr) 2015-10-08

Family

ID=52814964

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/056373 WO2015150183A1 (fr) 2014-04-01 2015-03-25 Injecteur de carburant

Country Status (3)

Country Link
EP (1) EP3126663A1 (fr)
DE (1) DE102014206210A1 (fr)
WO (1) WO2015150183A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015226514A1 (de) 2015-12-22 2017-06-22 Robert Bosch Gmbh Kraftstoffinjektor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021538A1 (de) * 2004-05-03 2005-12-08 Robert Bosch Gmbh Ventilvorrichtung zum Steuern von Flüssigkeiten
DE102005037956A1 (de) * 2005-08-11 2007-02-15 Robert Bosch Gmbh Geteiltes Einspritzventilglied mit Doppelsitz
WO2011051060A1 (fr) * 2009-10-26 2011-05-05 Robert Bosch Gmbh Dispositif d'injection de carburant
EP2426348A1 (fr) * 2010-09-07 2012-03-07 Robert Bosch GmbH Soupape d'injection de combustible
US20150060576A1 (en) * 2013-08-27 2015-03-05 Denso Corporation Fuel injector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10320491B4 (de) * 2003-05-08 2014-05-08 Volkswagen Ag Kraftstoffeinspritzventil für eine Brennkraftmaschine
DE102008055177A1 (de) * 2008-12-30 2010-07-01 Robert Bosch Gmbh Kraftstoff-Injektor
DE102009047559A1 (de) 2009-12-07 2011-06-09 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021538A1 (de) * 2004-05-03 2005-12-08 Robert Bosch Gmbh Ventilvorrichtung zum Steuern von Flüssigkeiten
DE102005037956A1 (de) * 2005-08-11 2007-02-15 Robert Bosch Gmbh Geteiltes Einspritzventilglied mit Doppelsitz
WO2011051060A1 (fr) * 2009-10-26 2011-05-05 Robert Bosch Gmbh Dispositif d'injection de carburant
EP2426348A1 (fr) * 2010-09-07 2012-03-07 Robert Bosch GmbH Soupape d'injection de combustible
US20150060576A1 (en) * 2013-08-27 2015-03-05 Denso Corporation Fuel injector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3126663A1 *

Also Published As

Publication number Publication date
DE102014206210A1 (de) 2015-10-01
EP3126663A1 (fr) 2017-02-08

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