EP2108081B1 - Fixation de douille élastique - Google Patents

Fixation de douille élastique Download PDF

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Publication number
EP2108081B1
EP2108081B1 EP07847920A EP07847920A EP2108081B1 EP 2108081 B1 EP2108081 B1 EP 2108081B1 EP 07847920 A EP07847920 A EP 07847920A EP 07847920 A EP07847920 A EP 07847920A EP 2108081 B1 EP2108081 B1 EP 2108081B1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
expansion sleeve
injector according
lateral surface
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.)
Not-in-force
Application number
EP07847920A
Other languages
German (de)
English (en)
Other versions
EP2108081A1 (fr
Inventor
Juergen Hanneke
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 EP2108081A1 publication Critical patent/EP2108081A1/fr
Application granted granted Critical
Publication of EP2108081B1 publication Critical patent/EP2108081B1/fr
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
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00

Definitions

  • Out DE 196 50 865 A1 is a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, known as a common rail high-pressure accumulator injection system. About the prevailing in the control chamber fuel pressure under the influence of a stroke movement of a valve piston is controlled with an injection port of the injection valve is opened or closed.
  • the solenoid valve comprises an electromagnet, a movable armature and a valve member moved in the direction of flow with the armature and acted upon by a valve closing spring, which cooperates with the valve seat of the solenoid valve and thus controls the fuel drain from the control chamber.
  • fuel injectors are fastened to the cylinder head, for example by means of a clamping claw or the like, depending on the configuration of the cylinder head of the engine manufacturer.
  • a fastening device for fastening a fuel injection valve in a cylinder head is known, wherein the fastening device is in the form of a hold-down sleeve.
  • the injector body of the fuel injector with a hydraulic line for acting on a hydraulic fluid, a pressure piston and an expansion bushing. If the pressure piston is screwed into the injector body, the hydraulic fluid stored in the conduit system for the tension medium is released displaced the tension line system. As a result of the displaced fluid, the expansion bushing, which has at least one pocket-shaped, thin-walled, formed area, is deformed and the thin-walled design of the hydraulic fluid makes it possible to elastically deform the wall of the expansion bushing. At the expansion sleeve two pocket-shaped thin-walled areas are preferably formed, which are seen in the axial direction of the expansion sleeve, arranged one above the other.
  • the two pocket-shaped areas ensure that the injector body of the fuel injector centered evenly to the center of its receiving bore in the cylinder head area. If the pressure on the expansion region, ie the thin-walled region of the expansion bush further increased by further screwing the pressure piston in the injector body, results in a radial strain of the expansion sleeve in the bore of the cylinder head, since the outer sides of the expansion sleeve to the inner walls of the receiving bore of the cylinder apply relevant fuel injector in the cylinder head of the internal combustion engine. This radial tension can be increased to such an extent by further displacement of hydraulic fluid from the tension line system formed in the injector body that the axial force, which results from the combustion pressure and acts on the fuel injector, can easily be sustained.
  • a release of the inventively proposed compound of the fuel injector is achieved in that the pressure piston which acts on the tension line system for the hydraulic medium in the injector body of the fuel injector is unscrewed from the injector body and thereby a pressure relief of the tension line system in which the hydraulic fluid is stored, takes place. If the formation of two pocket-shaped, thin-walled regions on the expansion bushing is not possible, for example due to lack of space, then the radial prestressing force can be made by forming a radial prestressing region by utilizing a second guidance of the fuel injector in the region of the nozzle tightening nut.
  • FIG. 1 The representation according to FIG. 1 the inventively proposed fuel injector, embedded in a receiving bore on the cylinder head of an internal combustion engine, can be seen.
  • FIG. 1 shows a cylinder head 10 shown cut, in which a receiving bore 12 extends.
  • the receiving bore 12 has a bore inner wall 14 and a first bore portion 16 and a second bore portion 18.
  • the first bore portion 16 is formed in a larger compared to the second bore portion 18 diameter in the material of the cylinder head 10 above a combustion chamber of the internal combustion engine.
  • the fuel injector 20 includes a holding body 22; the axis of the fuel injector 20 is designated by reference numeral 24.
  • the fuel injector 20 includes a nozzle retaining nut 26, whose lateral surface is designated by reference numeral 28.
  • a Dehnbuchse 30 in the untensioned state 64 On the lateral surface 28 of the holding body 22 of the fuel injector 20 is shown in the illustration FIG. 1 a Dehnbuchse 30 in the untensioned state 64.
  • the expansion sleeve 30 is preferably stoffschtüssig connected to the on the lateral surface 28 of the holding body 22 of the fuel injector 22 at a first joint 32 and at a second joint 34.
  • first joint 32 and the second joint 34 By forming the first joint 32 and the second joint 34 as cohesive joints, a pressure-tight attachment of the bushing 30 is achieved on the lateral surface 28 of the holding body 22.
  • a tensioning line 50 extends in the holding body 22 of the fuel injector 20, a tensioning line 50 extends.
  • the tension line 50 comprises a blind hole 58 and a parallel to the axis 24 of the fuel injector 20 extending channel 60, which opens at an orifice point 62 in the lateral surface 28 of the holding body 22.
  • the tensioning line 50 which comprises at least the above-listed components, is filled with a hydraulic fluid.
  • the tensioning line 50 opens on the one hand at the mouth 62 of the lateral surface 28 of the holding body 22 of the fuel injector 20;
  • the tensioning line 50 as shown in FIG FIG. 1 a pressure piston 48 designed, for example, as a grub screw or the like.
  • the pressure piston 48 may be accommodated, for example, in the form of the grub screw mentioned in the blind hole 58 of the tensioning line 50.
  • the pressure piston 48 comprises a sealing element 56, by means of which the escape of hydraulic fluid from the tensioning line 50 to the environment is prevented.
  • the pressure piston 48 is in an indicated by reference numeral 72 unscrewed position 72 that is, the end face of the pressure piston 48 is located in the lateral surface of the holding body 22 of the fuel injector 20th
  • the two pocket-shaped recesses 40 and 42 as shown in FIG FIG. 1 lie, seen in the axial direction, parallel to the axis 24 of the holding body 22nd
  • expansion sleeve 30 has an inner side 38 which is located at a small distance from the lateral surface 28 of the holding body 22 and an overflow of the hydraulic fluid, for example, from the designated by reference numeral 42 second pocket-shaped recess via an annular gap between the Inside 38 and the lateral surface 28 in the first pocket-shaped recess 40 allowed. This ensures that when the hydraulic fluid exits at the outlet point 62, the entire inner side 38 of the expansion bushing 30 fastened to the lateral surface 28 is acted upon by hydraulic fluid.
  • the fuel injector 20 has a guide surface 68 underneath the holding body 22 on the nozzle clamping nut 26.
  • the guide surface 68 serves to guide or center the fuel injector 20 within the receiving bore 12 when this is made shorter for space and installation reasons and the expansion sleeve 30 within the first bore portion 16 only one of the pocket-shaped recesses 40 or 42 has.
  • the solution proposed by the invention following by pressurizing the expansion sleeve 30 with a pocket-shaped recess 40 or 42, a fixing and centering of the fuel injector 20 can be achieved in the receiving bore 12, because by the guide surface 68 on the circumference of the nozzle lock nut 26th whose centering is ensured in the receiving bore 12.
  • the pressure piston 48 is shown in the screwed into the blind hole 58 state 70.
  • the pressure piston 48 is screwed by the stroke in the blind hole 58. Due to this fact, the stored in the tensioning line 50 hydraulic fluid is displaced from the blind hole 48 via the channel 60 and exits at the mouth point 62 on the lateral surface 28 of the holding body 22 within the expansion sleeve 30.
  • a second clamping force 46 acts in the region of the first pocket-shaped recess 40 of the expansion sleeve 30 by the deformation in the radial direction outwardly a first clamping force F 1 and by the deformation of the wall of the expansion sleeve 30 in the second pocket-shaped recess 42, a second clamping force 46 (F 2nd ).
  • the clamping forces 44 and 46 (F 1 , F 2 ) acting in the radial direction produce a holding force acting in the axial direction with which the fuel injector 20 with its holding body 22 is fixed in the receiving bore 12 of the cylinder head 10.
  • an axial holding force can be generated, which counteracts the pressure force acting in the combustion chamber of the internal combustion engine and exceeds them so far that the fuel injector 22 reliably and sealed by the fixed to the lateral surface 28 of the holding body 22 expansion sleeve 30 remains fixed in the receiving bore 12 of the cylinder head 10.
  • the in the region of the first pocket-shaped recess 40, acting in the radial direction clamping force 44 (F 1 ) also acts as a seal, so that the expansion sleeve 30 in addition to the bias of the fuel injector 20 in the receiving bore 12 also assumes a sealing, so that additional sealing elements omitted can.
  • a pocket-shaped recess 40 or 42 may be provided.
  • the generation of a clamping force F 1 or F 2 is sufficient to fix the holding body 22 of the fuel injector 22 in the receiving bore 12, when the fuel injector 20 with its formed on the nozzle retaining nut 26 guide surface 68 in the second bore portion 18 of the receiving bore 12 in Cylinder head 10 remains guided.
  • the expansion sleeve 30 can be clamped in the radial direction within the receiving bore 12.
  • This radial tension according to the clamping forces 44 and 46 can be increased by the hydraulic fluid so that it can easily resist the axial force resulting from the combustion pressure.
  • Loosening of the connection can be achieved by moving the pressure piston 48 out of the blind bore 58 of the tensioning line 50 and with an associated pressure relief of the expansion bush 30. If the conditions in the region of the receiving bore 12 do not permit a second embodiment of two pocket-shaped recesses 40, 42, the fuel injector 20 can be guided and centered by means of the guide surface 68 formed on the nozzle clamping nut 26.

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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)
  • Fuel-Injection Apparatus (AREA)

Claims (10)

  1. Injecteur de carburant (20) comprenant un corps de retenue (22) et un écrou de serrage de buse (26), caractérisé en ce que l'injecteur de carburant (20) présente une douille extensible (30) pouvant être sollicitée par un fluide hydraulique, avec laquelle l'injecteur de carburant (20) est fixé, assujetti et centré dans un alésage de réception (12) d'une culasse (10), la douille extensible (30) étant disposée dans l'alésage de réception (12) de la culasse (10).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la douille extensible (30) est fixée sur une surface d'enveloppe (28) d'un corps de retenue (22) de l'injecteur de carburant (20).
  3. Injecteur de carburant selon la revendication 2, caractérisé en ce que la douille extensible est fixée au niveau d'un premier point d'assemblage (32) et d'un autre point d'assemblage (34) par engagement par liaison de matière sur la surface d'enveloppe (28) du corps de retenue (22).
  4. Injecteur de carburant selon la revendication 1, caractérisé en ce qu'au moins un évidement en forme de poche (40, 42) est réalisé sur un côté intérieur (38) de la douille extensible (30).
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce que l'épaisseur de paroi de la douille extensible (30) est réduite dans le matériau de la douille extensible (30) dans la région de l'au moins un évidement en forme de poche (40, 42).
  6. Injecteur de carburant selon la revendication 1, caractérisé en ce qu'une conduite de serrage (50) pour un fluide hydraulique est réalisée dans le corps de retenue (22) de l'injecteur de carburant (20).
  7. Injecteur de carburant selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que la conduite de serrage (50) présente un alésage borgne ainsi qu'un canal (60), qui débouche au niveau d'un point d'embouchure (62) de la surface d'enveloppe (28) à l'intérieur de la région de la surface d'enveloppe (28) entourée par la douille extensible (30).
  8. Injecteur de carburant selon la revendication 1, caractérisé en ce qu'un piston de compression (48) sollicitant en pression ou détendant en pression le fluide hydraulique est reçu dans la conduite de serrage (50).
  9. Injecteur de carburant selon la revendication 8, caractérisé en ce que le piston de compression (48) est réalisé sous forme de vis sans tête et présente au moins un élément d'étanchéité (56).
  10. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'écrou de serrage de buse (26) de l'injecteur de carburant (20) sert de surface de guidage (68) pour centrer et guider l'injecteur de carburant (20) lorsque l'alésage de réception dans la culasse (10) est réalisé avec une longueur axiale raccourcie.
EP07847920A 2007-01-10 2007-12-06 Fixation de douille élastique Not-in-force EP2108081B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007001549A DE102007001549A1 (de) 2007-01-10 2007-01-10 Dehnhülsenbefestigung
PCT/EP2007/063447 WO2008083883A1 (fr) 2007-01-10 2007-12-06 Fixation de douille élastique

Publications (2)

Publication Number Publication Date
EP2108081A1 EP2108081A1 (fr) 2009-10-14
EP2108081B1 true EP2108081B1 (fr) 2011-09-14

Family

ID=39031007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07847920A Not-in-force EP2108081B1 (fr) 2007-01-10 2007-12-06 Fixation de douille élastique

Country Status (6)

Country Link
US (1) US7992544B2 (fr)
EP (1) EP2108081B1 (fr)
JP (1) JP2010515854A (fr)
AT (1) ATE524652T1 (fr)
DE (1) DE102007001549A1 (fr)
WO (1) WO2008083883A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8015717B2 (en) * 2008-11-05 2011-09-13 The Boeing Company Variable shaft sizing for measurement targets
US9976527B1 (en) * 2017-01-13 2018-05-22 Caterpillar Inc. Fuel injector assembly having sleeve for directing fuel flow
US11200670B2 (en) * 2020-05-05 2021-12-14 International Business Machines Corporation Real-time detection and correction of shadowing in hyperspectral retinal images

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03177605A (ja) * 1989-12-07 1991-08-01 Japan Steel Works Ltd:The 摩擦式クランプ装置
JP3058339B2 (ja) * 1990-07-23 2000-07-04 株式会社東芝 ダイナミック型半導体記憶装置
DE19650865A1 (de) 1996-12-07 1998-06-10 Bosch Gmbh Robert Magnetventil
DE19808068A1 (de) * 1998-02-26 1999-09-02 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19962968A1 (de) * 1999-12-24 2001-06-28 Bosch Gmbh Robert Ausgleichselement
JP2001329931A (ja) * 2000-05-23 2001-11-30 Nissan Motor Co Ltd 内燃機関のインジェクタ支持構造
DE10055641A1 (de) * 2000-11-10 2002-06-13 Siemens Ag Dichtelement zum Anordnen zwischen einem Injektor und einem Zylinderkopf und Injektor und Zylinderkopf mit einem solchen Dichtelement
DE10108467A1 (de) 2001-02-22 2002-09-05 Bosch Gmbh Robert Befestigungsvorrichtung
DE10122256A1 (de) * 2001-05-08 2002-11-21 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für Brennkraftmaschinen, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
ITTO20010787A1 (it) * 2001-08-03 2003-02-03 Rft Spa Gruppo di iniezione provvisto di tenuta, per un motore a combustione interna.
DE10145988A1 (de) * 2001-09-18 2003-05-08 Siemens Ag Befestigungsanordnung zur Befestigung von Injektoren an einem Zylinderkopf
DE10358913A1 (de) * 2003-12-16 2005-09-01 Robert Bosch Gmbh Brennstoffeinspritzventil
FR2890123B1 (fr) * 2005-08-29 2007-11-23 Peugeot Citroen Automobiles Sa Dispositif de fixation d'au moins un injecteur sur une culasse et moteur a combustion interne comprenant un tel dispositif
DE102006018194B4 (de) * 2006-04-19 2010-06-10 Winkelmann Powertrain Components Gmbh & Co. Kg Vorrichtung zur Befestigung eines Einspritzventils in einer Ventilaufnahme einer Brennkraftmaschine
EP1862669B1 (fr) * 2006-06-01 2010-03-03 Continental Automotive GmbH Dispositif de compensation et arrangement de culasse

Also Published As

Publication number Publication date
DE102007001549A1 (de) 2008-07-17
ATE524652T1 (de) 2011-09-15
US20100043756A1 (en) 2010-02-25
WO2008083883A1 (fr) 2008-07-17
US7992544B2 (en) 2011-08-09
JP2010515854A (ja) 2010-05-13
EP2108081A1 (fr) 2009-10-14

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