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EP1913252B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1913252B1
EP1913252B1 EP06777975.1A EP06777975A EP1913252B1 EP 1913252 B1 EP1913252 B1 EP 1913252B1 EP 06777975 A EP06777975 A EP 06777975A EP 1913252 B1 EP1913252 B1 EP 1913252B1
Authority
EP
European Patent Office
Prior art keywords
sealing body
fuel injection
valve
injection valve
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.)
Active
Application number
EP06777975.1A
Other languages
German (de)
English (en)
Other versions
EP1913252A1 (fr
Inventor
Ferdinand Reiter
Christof Vogel
Chris Louis
Gerald Scheday
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 EP1913252A1 publication Critical patent/EP1913252A1/fr
Application granted granted Critical
Publication of EP1913252B1 publication Critical patent/EP1913252B1/fr
Active 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
    • F02M51/0664—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
    • F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injection valve which comprises a core surrounded by a magnetic coil, an armature, by means of which a valve seat with a fixed valve seat cooperable by means of a welded to the anchor connection pipe, a tubular intermediate metal part, with its one end facing the armature end the core and at its other end to a tubular connecting part by welding is tightly connected, and at least one of the magnetic coil spanning bow-shaped guide member which is connected with its valve closing body facing the end with the connecting part and at its other end to the core by welding.
  • the welding of two overlapping components of the fuel injection valve takes place in a cross-sectional reduction of one of the two parts to be welded.
  • a disadvantage of the fuel injection valve known from the above document is in particular that the preparation of the connections between the individual components of the fuel injection valve complicated and thus time consuming and costly is. Furthermore, the welded areas are thermally stressed and thereby lose their strength and flexural rigidity, which can lead to significant resonances due to differently strong housing parts and associated noise during operation of the fuel injection valve. Furthermore, causes a molded-in below the suction pipe side seal support ring that contact points between the housing and the valve sleeve are not reliably sealed, which can lead to problems due to poor sealing in particular during turbo operation of the internal combustion engine.
  • a fuel injection valve which has a magnetic coil which cooperates with an acted upon by a return spring armature, which forms an axially movable valve member together with a valve needle.
  • a valve closing body is provided, which forms a sealing seat with a valve seat body.
  • No sealing body is provided between the magnetic coil and a valve housing, but a square-shaped stop ring.
  • This stop ring is inserted between a downstream end portion of the fixed inner pole and an end portion of the valve housing.
  • the tail of the inner pole and the end portion of the valve housing are formed so flange that an annular space is formed, in which the stop ring can be used accurately. In this case, the in FIG.
  • EP1797313 discloses another fuel injector having a cross-sectionally quadrangular elastomeric sealing body between the bobbin and a radially extending shoulder of the valve housing.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that between the valve body, a valve sleeve and a solenoid reliable sealing by a fuel-resistant elastomer is axially possible.
  • This seal is preferably made of rubber in cross-section square sealing body, which has the advantage that the sealing body used is simple and inexpensive.
  • Another advantage is that the sealing body within the fuel injector has only a small footprint, which is additionally reduced by the fact that the sealing body is clamped and pressed in the installed state after installation.
  • the sealing body is introduced in the region between an underside of a coil carrier receiving the magnetic coil, an outer circumferential surface of a valve sleeve and a radially extending shoulder of the valve housing. Im completely When installed, the sealing body largely fills this receiving area and guarantees safe and reliable sealing through its direct physical contact with these valve components.
  • the sealing body ultimately has an elliptical or egg-shaped cross-section in the compressed state.
  • the coil carrier can ideally have on its underside a circumferential collar or a plurality of nubs distributed over the circumference, which delimit the receiving region of the sealing body radially outwards.
  • FIG. 1 a schematic section through an embodiment of an inventively designed fuel injection valve
  • FIG. 2 a schematic partial section through the inventively designed fuel injection valve in the region of the section IV in FIG. 1 with a not yet pressed sealing body
  • FIG. 3 an enlarged view of the sealing body in cross section
  • FIG. 4 a schematic partial section through the inventively designed fuel injection valve in the region of the section IV in FIG. 1 with a pressed after installation in the installed state sealing body.
  • FIG. 1 shows a schematic sectional view of a longitudinal section through an embodiment of an inventively designed fuel injector 1, which is particularly suitable for injecting fuel into a not shown suction manifold of an internal combustion engine.
  • the fuel injection valve 1 comprises a solenoid coil 2 which is wound on a bobbin 3.
  • the bobbin 3 is in a cup-shaped valve housing 4, which serves as a magnet pot of the electromagnetic circuit, encapsulated.
  • the bobbin 3 is penetrated by a valve sleeve 5, which is designed tubular.
  • a valve sleeve 5 On the outflow side of an arranged in the valve sleeve 5 inner pole 6, an armature 7 is arranged, which is connected to a valve needle 8.
  • the valve needle 8 is in operative connection with a ball-shaped in the exemplary embodiment valve closing body 10 which forms a sealing seat with a valve seat body 11. Downstream of the sealing seat, at least one injection orifice 13 is formed, from which the fuel is injected into the suction pipe, not shown.
  • the armature 7 is acted upon in the resting state of the fuel injection valve 1 by a return spring 14 with a force such that the fuel injection valve 1 is held closed by the pressure of the valve closing body 10 on the valve seat body 11.
  • the return spring 14 is disposed in a recess 15 of the armature 7 and the inner pole 6 and is brought by an adjusting sleeve 16 to bias.
  • a cup-shaped filter element 17 is preferably pressed into the valve sleeve 5.
  • the fuel which is supplied via a central fuel supply 18, flows through the fuel injection valve 1 through a supply pipe 24, the recess 15 and flows to the valve seat body 11 and the injection orifice 13.
  • the fuel injection valve 1 is provided in the region of the central fuel supply 18 with a seal 19. Another seal 20 seals the connection, not shown, between the fuel injection valve 1 and the intake manifold.
  • the solenoid coil 2 is energized via a line from an electrical current which can be supplied via an electrical plug contact 21.
  • the plug-in contact 21 is part of an electrical connector plug 22 made of plastic, which can be molded with a plastic extrusion on the valve housing 4, on the valve sleeve 5 and on the supply pipe 24.
  • the Brennscherinspritzventill 1 is closed as soon as the magnetic coil 2 exciting current is turned off and the magnetic field is reduced so far that the return spring 14, the armature 7 deprives the inner pole 6, whereby the valve needle 8 moves in the outflow direction and the valve closing body 10 touches on the valve seat body 11 ,
  • valve sleeve 5 is designed tubular. Between valve housing 4, coil support 3 and valve sleeve 5 according to the invention a sealing body 25 made of an elastomeric material, preferably made of rubber, is provided, which constitutes a reliable sealing of the valve sleeve 5 relative to the valve housing 4.
  • FIG. 2 shows a schematic partial section through the inventively designed fuel injector 1 in the region of the section IV in FIG. 1 with a not yet pressed sealing body 25.
  • the sealing body 25 is square-shaped and trapezoidally similar in cross-section. The installation of the sealing body 25 is carried out such that the sealing body 25 is inserted into the region between a bottom 27 of the bobbin 3, an outer circumferential surface 28 of the valve sleeve 5 and a radially extending shoulder 29 of the valve housing 4. While the valve housing 4 is already fastened or held on the valve sleeve 5, the coil carrier 3 with the magnetic coil 2 is pushed into the valve housing 4 only after the introduction of the sealing body 25. At this time, the sealing body 25 is in an unstressed state with a annular contour and a rectangular cross-section, as in FIG. 3 is shown before.
  • the sealing body 25 With an inner side 30 of the sealing body 25 is located on the outer surface 28 of the valve sleeve 5, wherein the inner side 30 and the lateral surface 28 are not exactly parallel.
  • the sealing body 25 rather extends with its inner side 30 slightly inclined to the longitudinal axis of the fuel injection valve 1 and thus inclined to the lateral surface 28 of the valve sleeve 5 and the outer side 31 of the sealing body 25. Therefore, the cross section of the sealing body 25 also describes no ideal trapezoid, but he has only close to this form.
  • the bobbin 3 facing upper side 32 of the sealing body 25 extends obliquely inclined to the longitudinal axis of the fuel injection valve 1, e.g.
  • the edges of the sealing body 25 are e.g. rounded, the radii of all rounded edges may be different.
  • the bobbin 3 has on its underside 27 a radially encircling collar 12 which is arranged radially outside of the sealing body 25 and which rests in a clamped state of the sealing body 25 on the shoulder 29 of the valve housing 4 ( FIG. 4 ).
  • a plurality of knobs may also be mounted radially symmetrically on the underside 27 of the coil carrier 3.
  • the time is finally reached at which the bobbin 3 touches with its bottom 27 for the first time the sealing body 25 at its highest point and in FIG. 2 is shown.
  • This highest point of the sealing body 25 is in the (rounded) edge region of the transition from the top 32 to the outside 31. From this point on, the sealing body 25 is deformed in the further assembly.
  • FIG. 4 shows a schematic partial section through the inventively designed fuel injector 1 in the region of the section IV in FIG. 1 with a compressed after installation in the installed state sealing body 25.
  • the elastomeric material of the sealing body 25 moves largely radially outward.
  • the material differs slightly in other directions, so that an optimal seal with the sealing body 25 according to the invention can be achieved.

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

Claims (9)

  1. Soupape d'injection de carburant (1) avec une bobine magnétique (2), qui coopère avec un induit (7) soumis à un ressort de rappel (14), et qui forme avec un pointeau (8) une partie de soupape mobile axialement, dans laquelle il est prévu sur le pointeau (8) un corps de fermeture de soupape (10), qui forme avec un corps de siège de soupape (11) un siège étanche, dans laquelle un corps d'étanchéité (25) de section transversale quadrangulaire, qui se compose d'un matériau élastomère résistant au carburant, en particulier de caoutchouc, est inséré entre la bobine magnétique (2) et un corps de soupape (4), dans laquelle le corps de soupape (4) comprend un épaulement s'étendant radialement (29), qui soutient la bobine magnétique (2) et le corps d'étanchéité (25) est glissé dans la région entre un côté inférieur (27) d'un support de bobine (3) et l'épaulement s'étendant radialement (29) du corps de soupape (4), caractérisée en ce que le corps d'étanchéité (25) possède, dans l'état monté et serré, une section transversale en forme d'ellipse ou d'oeuf.
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que le corps d'étanchéité (25) entoure en forme d'anneau et possède dans l'état détendu une section transversale d'allure trapézoïdale.
  3. Soupape d'injection de carburant selon la revendication 2, caractérisée en ce que le corps d'étanchéité (25) a un côté intérieur (30), un côté extérieur (31), un côté supérieur (32) et un côté inférieur (33), dans laquelle la plus grande extension axiale du corps d'étanchéité (25) se situe entre les transitions du côté extérieur (31) vers le côté supérieur (32) et le côté inférieur (33).
  4. Soupape d'injection de carburant selon la revendication 2 ou 3, caractérisée en ce que le côté intérieur (30) et le côté extérieur (31) ne sont pas parallèles l'un à l'autre.
  5. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que les arêtes du corps d'étanchéité (25) sont arrondies.
  6. Soupape d'injection de carburant selon la revendication 5, caractérisée en ce que les rayons des arêtes arrondies du corps d'étanchéité (25) sont différents.
  7. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que le corps d'étanchéité (25) est inséré dans la région entre un côté inférieur (27) d'un support de bobine (3) recevant la bobine magnétique (2), une surface latérale extérieure (28) d'une douille de soupape (5) et un épaulement s'étendant radialement (29) du corps de soupape (4).
  8. Soupape d'injection de carburant selon la revendication 7, caractérisée en ce que le support de bobine (3) présente sur son côté inférieur (27) un collet périphérique (12) ou plusieurs bosses réparties sur la périphérie, qui limitent radialement vers l'extérieur la région de réception du corps d'étanchéité (25).
  9. Soupape d'injection de carburant selon la revendication 8, caractérisée en ce que le corps d'étanchéité (25) est serré, dans l'état entièrement monté, entre le côté inférieur (27) du support de bobine (3), le collet (12) ou les bosses du support de bobine (3), la surface latérale extérieure (28) de la douille de soupape (5) et l'épaulement (29) du corps de soupape (4) avec un contact matériel avec ces composants.
EP06777975.1A 2005-08-04 2006-07-26 Soupape d'injection de carburant Active EP1913252B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005037319A DE102005037319A1 (de) 2005-08-04 2005-08-04 Brennstoffeinspritzventil
PCT/EP2006/064660 WO2007014887A1 (fr) 2005-08-04 2006-07-26 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1913252A1 EP1913252A1 (fr) 2008-04-23
EP1913252B1 true EP1913252B1 (fr) 2017-09-13

Family

ID=37003371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06777975.1A Active EP1913252B1 (fr) 2005-08-04 2006-07-26 Soupape d'injection de carburant

Country Status (5)

Country Link
US (1) US8770498B2 (fr)
EP (1) EP1913252B1 (fr)
JP (1) JP4741670B2 (fr)
DE (1) DE102005037319A1 (fr)
WO (1) WO2007014887A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4897728B2 (ja) * 2008-03-18 2012-03-14 株式会社ケーヒン 電磁式燃料噴射弁
DE102009000872B4 (de) * 2009-02-16 2018-05-30 Robert Bosch Gmbh Einspritzventil
DE102012204305A1 (de) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Dicht umspritztes Bauelement und Verfahren zum Erstellen eines solchen Bauelements
EP2940286A1 (fr) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Filtre d'injecteur de carburant

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003269290A (ja) * 2002-03-19 2003-09-25 Denso Corp 燃料噴射弁
EP1797313A1 (fr) * 2004-09-29 2007-06-20 Robert Bosch Gmbh Soupape d'injection de carburant

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003227C1 (en) * 1990-02-03 1991-01-03 Robert Bosch Gmbh, 7000 Stuttgart, De EM fuel injection valve for IC engine - has two overlapping parts welded together as narrowed section of one part
JP2521825Y2 (ja) * 1991-02-28 1997-01-08 愛三工業株式会社 燃料噴射装置
JPH0849624A (ja) * 1994-06-01 1996-02-20 Zexel Corp 電磁式燃料噴射弁の燃料侵入防止装置
US5918818A (en) * 1996-05-22 1999-07-06 Denso Corporation Electromagnetically actuated injection valve
JPH1144275A (ja) 1997-07-03 1999-02-16 Zexel Corp 燃料噴射装置用ソレノイドバルブ
DE19744739A1 (de) * 1997-10-10 1999-04-15 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19808067A1 (de) * 1998-02-26 1999-09-02 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil
JPH11280592A (ja) * 1998-03-25 1999-10-12 Unisia Jecs Corp フューエルインジェクタ
JP3945357B2 (ja) * 2002-09-18 2007-07-18 株式会社デンソー 燃料噴射装置
DE10332348A1 (de) * 2003-07-16 2005-02-03 Robert Bosch Gmbh Brennstoffeinspritzventil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003269290A (ja) * 2002-03-19 2003-09-25 Denso Corp 燃料噴射弁
EP1797313A1 (fr) * 2004-09-29 2007-06-20 Robert Bosch Gmbh Soupape d'injection de carburant

Also Published As

Publication number Publication date
DE102005037319A1 (de) 2007-02-08
EP1913252A1 (fr) 2008-04-23
WO2007014887A1 (fr) 2007-02-08
JP2009508030A (ja) 2009-02-26
JP4741670B2 (ja) 2011-08-03
US20090179091A1 (en) 2009-07-16
US8770498B2 (en) 2014-07-08

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