EP1998038B1 - Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors - Google Patents

Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors Download PDF

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Publication number
EP1998038B1
EP1998038B1 EP20070010814 EP07010814A EP1998038B1 EP 1998038 B1 EP1998038 B1 EP 1998038B1 EP 20070010814 EP20070010814 EP 20070010814 EP 07010814 A EP07010814 A EP 07010814A EP 1998038 B1 EP1998038 B1 EP 1998038B1
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EP
European Patent Office
Prior art keywords
fuel injector
fixing device
axial end
tubular portion
force receiving
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
EP20070010814
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English (en)
French (fr)
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EP1998038A1 (de
Inventor
Mario D'onofrio
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
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP20070010814 priority Critical patent/EP1998038B1/de
Priority to DE200760007739 priority patent/DE602007007739D1/de
Priority to EP10001914A priority patent/EP2199592B1/de
Publication of EP1998038A1 publication Critical patent/EP1998038A1/de
Application granted granted Critical
Publication of EP1998038B1 publication Critical patent/EP1998038B1/de
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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
    • 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, according to the preamble of claim 1 and to a fuel injector.
  • 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.
  • WO 02/068815 A discloses a fixing device according to the preamble of claim 1.
  • 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 fixing device for fixing a fuel injector in a cylinder head of a combustion engine comprisis a tubular portion including a central longitudinal axis, the tubular portion being designed to engage the fuel injector and to be rigidly coupable to the fuel injector, a supporting element with a first axial end and a second axial end, the second axial end having a larger radial distance to the central longitudinal axis than the first axial end, and the first axial end being rigidly coupled to the tubular portion, a force receiving element extending outwards in radial direction relative to the central longitudinal axis from an inner coupling section to an outer coupling section, the inner coupling section being designed to be rigidly coupable to the fuel injector and the outer coupling section being rigidly coupled to the supporting element.
  • the supporting element is arranged and designed to receive a retaining force.
  • the retaining force acts in the direction of the central longitudinal axis to retain the fuel injector in the cylinder head, and the supporting element follows the force receiving element in the direction of the retaining force and is designed to transfer the retaining force from the force receiving element to the tubular portion.
  • the force receiving element can have a high robustness against mechanical stress, in particular a high robustness against a permanent retaining force.
  • the force receiving element can be constructed with a small amount of material.
  • a compact construction is possible.
  • a good transfer of the retaining force from the force receiving element via the supporting element to the tubular portion is possible.
  • the first axial end of the supporting element and the second axial end of the supporting element are arranged on an axis forming an angle of 45° with the central longitudinal axis.
  • the force receiving element and the supporting element are formed in one piece with the tubular portion.
  • the force receiving element, the supporting element and the tubular portion can be formed from a single sheet of one material.
  • the invention is distinguished by a fuel injector comprising a respective fixing device.
  • 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 ( figure 3 ) comprises an injector coupling portion 24 and a valve assembly 27.
  • the injector coupling portion 24 is designed to be coupled to a high-pressure 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.
  • An embodiment of the fixing device 30 shown in figure 2 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 supporting elements 38 which are in one piece with the tubular portion 32.
  • the tubular portion 32 follows the supporting elements 38 directly in the direction of the retaining force F.
  • the supporting elements 28 extend outward from the tubular portion 32 from a first axial end 48 to a second axial end 50.
  • the second axial end 50 has a larger distance from the central longitudinal axis L than the first axial end 48.
  • the supporting elements 38 are coupled to force receiving elements 36.
  • a retaining force F can be applied to the force receiving elements 36 to fix the fuel injector 18 in a recess 15 of the cylinder head 14 ( figure 3 ).
  • the tubular portion 32 of the fixing device 30 has a first axial end 44 and a second axial end 46.
  • the fixing device 30 has a recess 56 in axial direction 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, 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 tubular portion 32 of the fixing device 30.
  • the force receiving elements 36 extend outwards in radial direction relative to the central longitudinal axis L from an inner coupling section 52 to an outer coupling section 54.
  • the outer coupling section 54 of the force receiving element 36 is an outer end of the force receiving element 36.
  • the outer coupling section 54 of the force receiving element 36 can also be a central section of the force receiving element 36.
  • the inner coupling section 52 of the force receiving element 36 is formed in a manner that it can be rigidly coupled to the fuel injectior 18.
  • the coupling of the inner coupling section 52 to the fuel injector 18 is realised by welding, but it may also be carried out by another adequate coupling method.
  • the supporting element 38 and the force receiving element 36 are a one-piece element.
  • the force receiving element 36 and the supporting element 38 are rigidly coupled with each other via the outer coupling section 54 of the force receiving element 36.
  • the supporting element 38 is following the force receiving element 36 in the direction of the retaining force F. This allows the retaining force F to be transferred from the force receiving element 36 via the supporting element 38 to the tubular portion 32.
  • the inner end 48 and the outer end 50 of the supporting 38 are arranged on an axis A.
  • the axis A is forming an angle ALPHA of about 45° with the central longitudinal axis L.
  • the radial and the axial extension of the fixing device 30 can be optimized. If the angle ALPHA is less than 45° this would result in a longer size of the fuel injector 18 as the force receiving elements 36 should have a minimal radial extension being sufficient that a force exerting device can be in proper engagement with the force receiving elements 36 to exert the retaining force F. On the other hand, if the angle ALPHA is larger than 45° the transfer of the retaining force F from the force receiving element 36 to the supporting element 38 is small.
  • FIG 4 shows another embodiment of the fixing device 30, wherein each of the projections comprises one of the force receiving elements 36 and one of the supporting elements 38.
  • 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 a protrusion which allows orienting the fuel injector 18 relative to the cylinder head 14. Additionally, a force exerting device is arranged in a way that it is in contact with the force receiving elements 36. Consequently, the retaining force F from the force exerting device is transmitted to the force receiving elements 36 and the supporting elements 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 supporting elements 38 and the tubular portion 32 or the projections 34 and the tubular portion 32. By this a high lifetime of the fixing device 30 can be obtained.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Claims (4)

  1. Befestigungsvorrichtung (30) zum Befestigen eines Kraftstoffinjektors (18) in einem Zylinderkopf (14) einer Brennkraftmaschine (22), umfassend
    einen rohrförmigen Bereich (32), der eine zentrale Längsachse (L) aufweist, während der rohrförmige Bereich (32) gestaltet ist, um mit dem Kraftstoffinjektor (20) in Eingriff zu stehen und starr an den Kraftstoffinjektor (18) koppelbar zu sein,
    ein kraftaufnehmendes Element (36), das sich auswärts in radialer Richtung in Bezug auf die zentrale Längsachse (L) von einem inneren Abschnitt (52) zu einem äußeren Abschnitt (54) erstreckt, gekennzeichnet durch
    ein Unterstützungselement (38) mit einem ersten axialen Ende (48) und einem zweiten axialen Ende (50), während das zweite axiale Ende (50) einen größeren radialen Abstand in Bezug auf die zentrale Längsachse (L) als das erste axiale Ende (48) aufweist und das erste axiale Ende (48) starr an den rohrförmigen Bereich (32) gekoppelt ist,
    der innere Abschnitt (52) und der äußere Abschnitt (54) des kraftaufnehmenden Elements (36) sind Koppelabschnitte (52; 54) und
    der innere Koppelabschnitt (52) ist gestaltet, um starr an den Kraftstoffinjektor (18) koppelbar zu sein und der äußere Koppelabschnitt (54) ist starr an das Unterstützungselement (38) gekoppelt.
  2. Befestigungsvorrichtung (30) gemäß Anspruch 1, während das erste axiale Ende (48) des Unterstützungselements (38) und das zweite axiale Ende (50) des Unterstützungselements (38) auf einer Achse (A) angeordnet sind, die einen Winkel (ALPHA) von 45° mit der zentralen Längsachse (L) bildet.
  3. Befestigungsvorrichtung (30) gemäß einem der vorhergehenden Ansprüche, während das kraftaufnehmende Element (36) und das Unterstützungselement (38) einstückig mit dem rohrförmigen Bereich (32) ausgebildet sind.
  4. Kraftstoffinjektor (18), umfassend eine Befestigungsvorrichtung (30) gemäß einem der vorhergehenden Ansprüche.
EP20070010814 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors Active EP1998038B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20070010814 EP1998038B1 (de) 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors
DE200760007739 DE602007007739D1 (de) 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors
EP10001914A EP2199592B1 (de) 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070010814 EP1998038B1 (de) 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP10001914.0 Division-Into 2010-02-24

Publications (2)

Publication Number Publication Date
EP1998038A1 EP1998038A1 (de) 2008-12-03
EP1998038B1 true EP1998038B1 (de) 2010-07-14

Family

ID=39106097

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20070010814 Active EP1998038B1 (de) 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors
EP10001914A Active EP2199592B1 (de) 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10001914A Active EP2199592B1 (de) 2007-05-31 2007-05-31 Befestigungsvorrichtung zum Befestigen einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors

Country Status (2)

Country Link
EP (2) EP1998038B1 (de)
DE (1) DE602007007739D1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011075057A1 (de) * 2011-05-02 2012-11-08 Robert Bosch Gmbh Brennstoffverteiler und System mit einem Brennstoffeinspritzventil
EP2860388B1 (de) * 2013-10-10 2017-07-26 Continental Automotive GmbH Brennstoffeinspritzvorrichtung für einen Verbrennungsmotor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705990A1 (de) * 1997-02-17 1998-08-20 Bosch Gmbh Robert Montagevorrichtung zur Montage eines Brennstoffeinspritzventils
DE10108467A1 (de) * 2001-02-22 2002-09-05 Bosch Gmbh Robert Befestigungsvorrichtung
DE10109408A1 (de) * 2001-02-28 2002-09-05 Bosch Gmbh Robert Befestigungsvorrichtung
DE10151004A1 (de) 2001-10-16 2003-06-18 Volkswagen Ag Haltevorrichtung für Einspritzventile in einer Kraftstoffeinspritzanlage von Verbrennungsmotoren
DE602006007839D1 (de) * 2006-08-04 2009-08-27 Continental Automotive Gmbh Befestigungsvorrichtung zur Befestigung eines Brennstoffeinspritzventils an einem Zylinderkopf einer Brennkraftmaschine

Also Published As

Publication number Publication date
EP2199592A1 (de) 2010-06-23
EP1998038A1 (de) 2008-12-03
EP2199592B1 (de) 2011-10-12
DE602007007739D1 (de) 2010-08-26

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