EP1884657A1 - Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne - Google Patents

Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne Download PDF

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Publication number
EP1884657A1
EP1884657A1 EP06016348A EP06016348A EP1884657A1 EP 1884657 A1 EP1884657 A1 EP 1884657A1 EP 06016348 A EP06016348 A EP 06016348A EP 06016348 A EP06016348 A EP 06016348A EP 1884657 A1 EP1884657 A1 EP 1884657A1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
tubular portion
fixing device
force
cylinder head
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.)
Granted
Application number
EP06016348A
Other languages
German (de)
English (en)
Other versions
EP1884657B1 (fr
Inventor
Gianbattista Fischetti
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE200660007839 priority Critical patent/DE602006007839D1/de
Priority to EP20060016348 priority patent/EP1884657B1/fr
Publication of EP1884657A1 publication Critical patent/EP1884657A1/fr
Application granted granted Critical
Publication of EP1884657B1 publication Critical patent/EP1884657B1/fr
Expired - Fee Related 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • 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

Definitions

  • the invention relates to a fixing device for fixing a fuel injector in a cylinder head of a combustion engine.
  • Fuel injectors are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose fuel into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine. Fuel can be supplied to the internal combustion engine by the fuel injector that comprises the fixing device. The fuel injectors can be coupled to the cylinder head of the internal combustion engine in different manners.
  • the coupling of the fuel injectors to the cylinder heads needs to be very precise to get a correct injection angle.
  • the object of the invention is to create a fixing device for fixing a fuel injector in a cylinder head of a combustion engine which is simply to be manufactured and which facilitates a reliable and precise coupling between the fuel injector and the cylinder head of the combustion engine.
  • the object of the invention is to create a force introduction arrangement to ensure the precise fixing of the fuel injector in the cylinder head of the combustion engine.
  • a fixing device for fixing a fuel injector in a cylinder head of a combustion engine comprising a tubular portion including a central longitudinal axis, the tubular portion being designed to engage the fuel injector and to be rigidly coupled to the fuel injector, and projections being formed in one piece with the tubular portion and being bent away to extend from tubular portion outwards in radial direction.
  • the projections comprise at least two force receiving areas and are arranged and designed to receive a retaining force in the force receiving areas.
  • the retaining force is acting in the direction of the central longitudinal axis to retain the fuel injector in the cylinder head, two of the force receiving areas are substantially opposing each other radially relative to the central longitudinal axis, and the projections are formed to follow directly the tubular portion in the direction of the retaining force.
  • the fixing device has a high robustness against mechanical stress, in particular the projections have a high robustness against permanent retaining forces. Furthermore, the fixing device is highly flexible in particular in radial direction due to a recess in the tubular portion caused by bending the projections away from the tubular portion. As the projections are formed to follow directly the tubular portion in the direction of the retaining force the force introduction via the force receiving areas into the projections causes only a small mechanical stress to the projections.
  • the tubular portion comprises a first axial end and a second axial end which are designed to be completely attachable to the fuel injector.
  • At least one of the first axial end and the second axial end is circumferentially closed.
  • the invention is distinguished by a fuel injector comprising a fixing device.
  • the invention is distinguished by a force introduction arrangement comprising a fuel injector and a force exerting device which is arranged and designed to exert the retaining force to the force receiving areas.
  • the force exerting device is a spring. By this it is possible to exert the retaining force to the force receiving areas by a simple structured element.
  • Figure 1 shows an internal combustion engine 22, with an intake air tract 10, a motor block 12, a cylinder head 14 and an exhaust gas tract 16.
  • a combustion chamber 20 is arranged in the motor block 12 .
  • the cylinder head 14 comprises a fuel injector 18 and a sparking plug 19.
  • a fixing device 30 enables the fixing of the fuel injector 18 to the cylinder head 14 of the combustion engine 22.
  • the fuel injector 18 (figures 2 and 3) comprises an injector coupling portion 24 and a valve assembly 27.
  • the injector coupling portion 24 is designed to be coupled to a highpressure fuel chamber of the internal combustion engine 22, the fuel is stored under high pressure, for example, under the pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine.
  • the injector coupling portion 24 is designed to be coupled to an electrical supply to actuate a not shown actuator unit of the fuel injector 18.
  • the valve assembly 27 comprises a valve body 26 with a central longitudinal axis L and a not shown cavity which is axially led through the valve body 26.
  • the valve assembly 27 further comprises a not shown valve needle taken in the cavity of the valve body 26.
  • the fixing device 30 comprises a tubular portion 32 extending in the direction of the central longitudinal axis L.
  • the tubular portion 32 of the fixing device 30 has an inner surface 40 in which the fuel injector 18 with an outer surface 42 is arranged.
  • the tubular portion 32 of the fixing device 30 engages the fuel injector 18 and is rigidly coupled to the fuel injector 18.
  • the coupling between the fuel injector 18 and the fixing device 30 can be realized by welding, but it may also be carried out by another adequate coupling method.
  • the fixing device 30 further comprises projections 36 which are in one piece with the tubular portion 32.
  • the projections 36 are bent away from the tubular portion 32 and extend outwards in radial direction from the tubular portion 32.
  • the projections 36 have force receiving areas 38.
  • a retaining force F can be applied to the force receiving areas 38 of the projections 36 to fix the fuel injector 18 in a recess 15 of the cylinder head 14 (figure 3).
  • the projections 36 follow the tubular portion 32 directly in the direction of the retaining force F.
  • the fixing device 30 comprises a protrusion 48 being in one piece with the tubular portion 32.
  • the protrusion 36 extends outwards in radial direction from the tubular portion 32. It is designed to serve as an orientation element to define the relative angular position of the fuel injector 18 relative to the cylinder head 14 during the assembly of the fuel injector 18 and the fixing device 30 with the cylinder head 14.
  • Figure 4 shows a first embodiment of the fixing device 30 with a first axial end 44 and a second axial end 46. Furthermore, the fixing device 30 has two circumferential ends 56 extending between the first axial end 44 and the second axial end 46. As the fixing device 30 has a gap 60 between the two circumferential ends 56 the axial ends 44, 46 of the fixing device 30 are open in circumferential direction. As they are formed continuously over a large extension in circumferential direction it is possible to attach the first axial end 44 as well as the second axial end 46 in one piece to the fuel injector 18. Therefore, a good coupling of the tubular portion 32 to the fuel injector 18 may be obtained, for preferably by applying a single weld seam between the outer surface 42 of the fuel injector 18 and each of the axial ends 44, 46 of the fixing device 30.
  • the tubular portion 32 further comprises recesses 50 by bending the projections 36 relative to the tubular portion 32.
  • the recesses 50 enable a high flexibility of the fixing device 30 in particular in the radial direction. This high flexibility is preferred in order to obtain a good coupling of the fixing device 30 to the fuel injector 18.
  • the first axial end 44 and the second axial end 46 of the fixing device 30 are circumferentially closed.
  • the tubular portion 42 of figure 5 comprises joint elements 58 so that the first axial end 44 and the second axial end 46 are circumferentially closed.
  • Figure 6 shows a force introduction arrangement 52 with a section of the fuel injector 18 and a force exerting device 54.
  • the force exerting device 54 is arranged to exert the retaining force F to the force receiving areas 38 of the fixing device 30.
  • the force exerting device 54 is a fork spring with two arms 70.
  • the force exerting device 54 is firmly coupled to the cylinder head 14 by a screw 72 thereby enabling an exertion of the retaining force F from the two arms 70 of the force exerting device 54 to the force receiving areas 38 of the fixing device 30.
  • the fuel injector 18 is inserted into the fixing device 30.
  • the fixing device 30 is clamped together.
  • the first axial end 44 and the second axial end 46 of the tubular portion 32 are in contact with the outer surface 42 of the fuel injector 18 thereby enabling a fixed coupling of the fixing device 30 to the fuel injector 18 preferably by welding.
  • the fuel injector 18 with the fixing device 30 is inserted into the recess 15 of the cylinder head 14 with the support of the protrusion 48 which allows orienting the fuel injector 18 relative to the cylinder head 14. Additionally, the force exerting device 54 is arranged in a way that the two arms 70 of the force exerting device 54 are in contact with the projections 36. Consequently, the retaining force F from the two arms 70 of the force exerting device 54 is transmitted to the force receiving areas 38 of the fixing device 30. By this the fuel injector 18 can be fixed in a secure manner in the recess 15 of the cylinder head 14 even if large forces exert on the fuel injector 18 in opposite direction to the retaining force F.
  • the fixing device 30 is very robust against mechanical stress in particular in the area between the bent projections 36 and the tubular portion 32. By this a high lifetime of the fixing device 30 can be obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20060016348 2006-08-04 2006-08-04 Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne Expired - Fee Related EP1884657B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200660007839 DE602006007839D1 (de) 2006-08-04 2006-08-04 Befestigungsvorrichtung zur Befestigung eines Brennstoffeinspritzventils an einem Zylinderkopf einer Brennkraftmaschine
EP20060016348 EP1884657B1 (fr) 2006-08-04 2006-08-04 Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060016348 EP1884657B1 (fr) 2006-08-04 2006-08-04 Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP1884657A1 true EP1884657A1 (fr) 2008-02-06
EP1884657B1 EP1884657B1 (fr) 2009-07-15

Family

ID=37663223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060016348 Expired - Fee Related EP1884657B1 (fr) 2006-08-04 2006-08-04 Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP1884657B1 (fr)
DE (1) DE602006007839D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008101748A1 (fr) * 2007-02-19 2008-08-28 Robert Bosch Gmbh Injecteur avec corps supplémentaire
EP1998038A1 (fr) * 2007-05-31 2008-12-03 Continental Automotive GmbH Dispositif de fixation pour fixer un injecteur de combustible dans un tête de cylindre d'un moteur à combustion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB448173A (en) * 1935-02-18 1936-06-03 Bosch Robert Improvements in or relating to fastening devices for fuel-injection nozzles
JPH1182241A (ja) * 1997-09-01 1999-03-26 Nissan Motor Co Ltd 内燃機関における燃料噴射弁取付装置
US6116219A (en) * 1997-04-10 2000-09-12 Automobiles Peugeot Device for fixing a fuel injector on an internal combustion engine cylinder head
US6170467B1 (en) * 1997-05-20 2001-01-09 Automobiles Peugeot Device for fixing a fuel injector on an internal combustion engine cylinder head, and method for fixing said injector
DE10356856A1 (de) 2003-12-05 2005-07-07 Siemens Ag Injektor für die Kraftstoffeinspritzung mit einer Spannvorrichtung zum Einbau in einem Zylinderkopf einer Brennkraftmaschine sowie Spannvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB448173A (en) * 1935-02-18 1936-06-03 Bosch Robert Improvements in or relating to fastening devices for fuel-injection nozzles
US6116219A (en) * 1997-04-10 2000-09-12 Automobiles Peugeot Device for fixing a fuel injector on an internal combustion engine cylinder head
US6170467B1 (en) * 1997-05-20 2001-01-09 Automobiles Peugeot Device for fixing a fuel injector on an internal combustion engine cylinder head, and method for fixing said injector
JPH1182241A (ja) * 1997-09-01 1999-03-26 Nissan Motor Co Ltd 内燃機関における燃料噴射弁取付装置
DE10356856A1 (de) 2003-12-05 2005-07-07 Siemens Ag Injektor für die Kraftstoffeinspritzung mit einer Spannvorrichtung zum Einbau in einem Zylinderkopf einer Brennkraftmaschine sowie Spannvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008101748A1 (fr) * 2007-02-19 2008-08-28 Robert Bosch Gmbh Injecteur avec corps supplémentaire
EP1998038A1 (fr) * 2007-05-31 2008-12-03 Continental Automotive GmbH Dispositif de fixation pour fixer un injecteur de combustible dans un tête de cylindre d'un moteur à combustion

Also Published As

Publication number Publication date
EP1884657B1 (fr) 2009-07-15
DE602006007839D1 (de) 2009-08-27

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