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EP0878622B1 - Befestigungsflansch eines Einspritzventils - Google Patents

Befestigungsflansch eines Einspritzventils Download PDF

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Publication number
EP0878622B1
EP0878622B1 EP19980401167 EP98401167A EP0878622B1 EP 0878622 B1 EP0878622 B1 EP 0878622B1 EP 19980401167 EP19980401167 EP 19980401167 EP 98401167 A EP98401167 A EP 98401167A EP 0878622 B1 EP0878622 B1 EP 0878622B1
Authority
EP
European Patent Office
Prior art keywords
injector
cylinder head
fixing flange
connecting element
axially
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.)
Expired - Lifetime
Application number
EP19980401167
Other languages
English (en)
French (fr)
Other versions
EP0878622A1 (de
Inventor
Stéphane Cochet
Laurent Delaigue
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.)
Renault SAS
Original Assignee
Renault SA
Renault SAS
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 Renault SA, Renault SAS filed Critical Renault SA
Publication of EP0878622A1 publication Critical patent/EP0878622A1/de
Application granted granted Critical
Publication of EP0878622B1 publication Critical patent/EP0878622B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws

Definitions

  • the present invention relates to an arrangement for fixing a fuel injector on the cylinder head of an engine of a motor vehicle, and more particularly the flange of maintenance of the injector.
  • An engine cylinder head comprising an arrangement for attachment of an injector according to the preamble of claim 1 is known from document FR 2 670 534 A.
  • the injector propels fuel either directly into the cylinder or in an intake chamber where mixing takes place air / fuel.
  • the injector passes through a part of the breech.
  • the cylinder head housing in which is received the injector is substantially perpendicular to the face internal of the cylinder head.
  • the cylinder head housing provided for receive the injector is a stepped housing, which is relatively narrow for precise guidance of the body and more particularly from the injector nose.
  • the main problem is a sealing problem between the intake cavity, constituted either by the cylinder itself, either by its intake pipe, and the housing of the cylinder head designed to receive the body and nose of the injector.
  • the intake cavity constituted either by the cylinder itself, either by its intake pipe
  • the housing of the cylinder head designed to receive the body and nose of the injector.
  • the lower end of the injector body rests on a seal. Sealing is then ensured by the axial clamping of the injector towards the cylinder head and on the seal.
  • this device requires a perfectly axial force tightening the lower end of the injector body on the seal.
  • the cylinder head housing which accommodates the injector body is relatively narrow.
  • any non-axial force applied to the top of the injector body may damage part of the body located in the cylinder head housing, and in particular the injector nose.
  • any non-axial force on the upper body of the injector will tend to compress part of the joint while by raising the diametrically opposite part which cannot therefore more adequately ensure its role sealing.
  • a mounting flange injector consisting mainly of a lever, the part of which central has a hole which is crossed by the upper part the injector body, one end of which is in contact on a part of the external surface of the cylinder head, and of which the other end includes a threaded hole in which is placed a threaded rod, integral with the cylinder head, which receives a tightening nut.
  • the central part of the lever has a bump, generally in the shape of a cylinder portion, which takes axially supported on a flat face of the upper body of the injector.
  • the whole of this device thus forms a lever whose axis is produced by the free end of the bearing bearing on the cylinder head, and the force is applied by the screwing of the nut on the threaded rod, which has the effect of driving the central part including the hump.
  • the point of application of the force is on the top of the injector body through the central part of the bearing and more especially by the bump mentioned. Due to the shape cylindrical of the hump, the forces on the injector body are vertical. However, they are not strictly axial, the bump in the center of the landing being located on a circle whose center is the free end of the bearing resting on the surface of the cylinder head. The bump is therefore likely to be offset and no longer exert the forces on the very axis of the injector body.
  • a fixing flange rests on an elastic ring immobilized in a radial groove of a central part of the injector body and it is fixed axially by two screws tightened in the holes threaded from the cylinder head.
  • the present invention provides a new arrangement for fixing a injector which allows an axial distribution of the forces, especially when mounting the fixing screws on the flange holding the injector body.
  • FIGS. 1 to 3 show an injector 10 comprising a cylindrical body 12 of which a lower part 14 is engaged in a stepped housing 16 of a cylinder head 18.
  • the annular lower end face 20 of the end 14 of the body 12 of injector 10 rests on an annular seal seal 22, itself resting axially on a lower shoulder 17 of housing 16 of cylinder head 18.
  • the lower part 14 of the body 12 of the injector 10 is extended at its lower end by an injector nose 24, or injection nozzle, which is used to inject fuel into the cylinder or in its intake duct.
  • Storied accommodation 16 of the cylinder head 18 crosses it and opens downwards in an intake cavity 26 delimited in particular by a portion 28 of the internal face of the cylinder head 18.
  • the nose 24 injector 10 can inject fuel into the cavity intake.
  • the body 12 of the injector 10 substantially comprises in its central part a radial groove 30 in which is fixed an elastic ring 32.
  • On this ring 32 axially bears a flange 34 for fixing the injector 10 on the cylinder head 18.
  • This flange 34 maintains the body 12 of injector 10 to tighten it axially in support waterproof against the gasket 22.
  • the fixing flange 34 is crossed in its lateral parts by holes 36 of axial orientation which are crossed by screws 38 of holding the fixing flange 34.
  • the vertical position of the radial groove 30 relative to to a portion 40 of the external face 40 of the cylinder head 18 determines an axial clearance required for tightening, between the mounting flange 34 and cylinder head 18.
  • a flange of attachment 42 has a lower face 44 of spherical shape concave.
  • This spherical underside is complementary of the convex spherical upper face 48 of an element of connection 46, of generally tubular shape.
  • the spherical surfaces 44 and 48 which come to bear one on the other have a center which, as we can see more particularly in Figure 3, is located on the X-X axis of the injector 10.
  • the sphere which defines the surfaces 44 and 48 has a diameter of about sixty millimeters.
  • the fixing flange 42 with a spherical surface is, same as before, crossed in its center by the body 12 of the injector 10.
  • the internal wall 50 of the hole center of the spherical mounting flange 42 is shaped similar to an inverted truncated cone.
  • the lateral parts of the spherical fixing flange 42 are crossed axially by the holes which accommodate the clamping screws.
  • one of the clamping screws is changed. It is a shouldered screw 52 comprising a head 54 in axial support on the flat upper face 45 of the flange spherical attachment 42. This head 54 is extended by a first smooth axial section 56, itself extended by a threaded section 58 of smaller diameter. The second threaded section 58 is provided to be screwed a tapped hole in the cylinder head 18.
  • the difference in diameter between the two sections 56 and 58 of screw 52 defines an annular shoulder surface 60 which is supported on the external face 40 of the cylinder head 18.
  • Tightening is completed by at least a second screw 62, which is a conventional non-shouldered screw.
  • Shoulder screw 52 can, of course, be replaced by a conventional screw, similar to the second screw 62, to which is added a complementary element forming spacer and acting as a shoulder.
  • This additional element is then tubular, it is crossed axially on its entire length by the threaded part of the screw, on which it is tight, and it is in axial support on the lower part of the screw head 62.
  • the additional element is tightened between the head of the screw 62, and the external face 40 of the cylinder head 18.
  • This element can be made from a material arbitrary, rigid enough to withstand the force which is applied.
  • it can be made of plastic material, especially in polyamide.
  • This installation method is facilitated by the central hole of the spherical fixing flange 42, the wall 50 of which has a general shape of an inverted truncated cone that keeps a certain inclination of the spherical fixing flange 42 relative to the body 12 of the injector 10, without risking damage this last.
  • the length of the first smooth section 56 of the shouldered screw 52 in accordance with the vertical position of the elastic ring 32, defines the clearance required for tightening between the upper face 40 of the cylinder head 18 and the flange of ball mount 52.
  • the whole axial clamping allows a distribution of the equal tightness over the entire circumference of the seal 22, thus preventing any impurity from entering the housing 16 of cylinder head 18.
  • This tightening allows more eliminate the risk of the elastic ring 32 being expelled out of the radial groove 30, and to avoid any bending of the body 12 of injector 10 caused by other efforts qu'axiaux.
  • the elastic ring 32 immobilized in the radial groove 30 of the body 12 of the injector and the element link 46 can be replaced by another element of bond made of matter with the injector body and one of which part of the upper side would have a spherical shape.

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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)

Claims (7)

  1. Zylinderkopf (18) für einen Motor, mit einer Anordnung für die Befestigung eines Einspritzventils (10) für den Kraftstoff, wobei das Einspritzventil ein Gehäuse (12) aufweist, von dem ein Teil in Axialrichtung eine zylindrische Aussparung (16) im Zylinderkopf (18) durchsetzt, sodass eine Spitze (24) für das Einspritzen von Kraftstoff, die das untere axiale Ende (20) des Einspritzventils (10) verlängert, in einer Einlasskammer (26) für den Kraftstoff mündet, die durch eine Innenseite (28) des Zylinderkopfes (18) begrenzt wird, wobei das Einspritzventil (10) in Axialrichtung im Klemmsitz im Zylinderkopf (18) durch einen Befestigungsflansch (42) gehalten wird, der sich auf einem Verbindungselement (46) abstützt, welches fest mit dem Mittenabschnitt des Gehäuses (12) des Einspritzventils (10) verbunden ist und das in Axialrichtung zum Zylinderkopf (18) hin durch in Axialrichtung in den Zylinderkopf (18) eingeschraubte Schrauben beaufschlagt wird, wobei ein Axialspiel zwischen dem Befestigungsflansch (42) und einer Außenseite (40) des Zylinderkopfes (18) besteht und wobei eine Dichtung (22) vorgesehen ist, auf der sich in Axialrichtung das untere Ende (20) des Gehäuses (12) des Einspritzventils (10) abstützt zur Erzielung einer Abdichtung zwischen der Aussparung (16) für das Gehäuse (12) des Einspritzventils (10) und der Einlasskammer (26) für den Kraftstoff, die durch die Innenseite (28) des Zylinderkopfes (18) begrenzt wird, dadurch gekennzeichnet, dass die zueinander komplementären Kontaktflächen (44,46) des Befestigungsflansches (42) und des Verbindungselementes (46) kugelförmig ausgestaltet sind, dass das Verbindungselement (46) in Axialrichtung im wesentlichen in der Mitte des Gehäuses (12) des Einspritzventils angeordnet ist und dass das Gehäuse (12) des Einspritzventils eine Öffnung (50) im Befestigungsflansch durchsetzt, die im wesentlichen konisch ausgestaltet ist zum Erhalt eines Radialspiels zwischen dem Befestigungsflansch (42) und dem Gehäuse (12) des Einspritzventils (10) während des Einbaus des Flansches (42).
  2. Anordnung für die Befestigung eines Einspritzventils (10) nach Anspruch 1, dadurch gekennzeichnet, dass der Mittelpunkt der Kugel, die durch die Kontaktflächen (44,48) zwischen dem Befestigungsflansch (42) und dem Verbindungselement (46) definiert ist, auf der Achse des Einspritzventils (10) angeordnet ist um eine axiale Verteilung der Klemmkraft zu erzielen.
  3. Anordnung für die Befestigung eines Einspritzventils (10) nach Anspruch 2, dadurch gekennzeichnet, dass das Verbindungselement (46) zwischen dem Befestigungsflansch (42) und dem Einspritzventil (10) ein Einsatzteil ist, das am Gehäuse (12) des Einspritzventils (10) befestigt ist.
  4. Anordnung für die Befestigung eines Einspritzventils (10) nach Anspruch 3, dadurch gekennzeichnet, dass sich das Verbindungselement (46) in Axialrichtung und in Richtung der Klemmkraft auf einem elastischen Haltering (32) abstützt, der in einer radialen Nut (30) des Gehäuses (12) des Einspritzventils (10) festgelegt ist.
  5. Anordnung für die Befestigung eines Einspritzventils (10) nach Anspruch 4, dadurch gekennzeichnet, dass das Verbindungselement (46) zwischen dem Befestigungsflansch und dem Gehäuse (12) des Einspritzventils (10) eine im wesentlichen rohrförmige Gestalt aufweist, wobei es vom Gehäuse (12) des Einspritzventils durchsetzt wird, sowie mit einer kugelförmigen Oberfläche (48) versehen ist und auf seiner Unterseite eine Nut aufweist um sich auf dem elastischen Haltering (32) abzustützen.
  6. Anordnung für die Befestigung eines Einspritzventils (10) nach Anspruch 1, dadurch gekennzeichnet, dass das Verbindungselement (46) zwischen dem Befestigungsflansch (42) und dem Gehäuse (12) des Einspritzventils (10) einstückig mit dem Gehäuse (12) des Einspritzventils (10) hergestellt worden ist.
  7. Anordnung für die Befestigung eines Einspritzventils (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine der Schrauben (52) für die Halterung des Befestigungsflansches (42) eine gestufte Schraube ist, die einen Schraubenkopf (54) aufweist zur axialen Anlage am Flansch (42), an den sich ein erster axialer Abschnitt (56) des Schaubenkörpers anschließt, der durch einen zweiten mit einem Gewinde versehenen Endabschnitt (58) mit geringerem Durchmesser verlängert ist, wobei die beiden Abschnitte durch eine untere ringförmige Schulterfläche (60) begrenzt sind, die in Kontakt steht mit der Außenseite (40) des Zylinderkopfes (18) und dass die Länge des ersten Abschnitts das Axialspiel zwischen dem Zylinderkopf (18) und dem Befestigungsflansch (42) bestimmt.
EP19980401167 1997-05-16 1998-05-15 Befestigungsflansch eines Einspritzventils Expired - Lifetime EP0878622B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9706024A FR2763379B1 (fr) 1997-05-16 1997-05-16 Bride de fixation d'un injecteur
FR9706024 1997-05-16

Publications (2)

Publication Number Publication Date
EP0878622A1 EP0878622A1 (de) 1998-11-18
EP0878622B1 true EP0878622B1 (de) 2003-08-06

Family

ID=9506961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980401167 Expired - Lifetime EP0878622B1 (de) 1997-05-16 1998-05-15 Befestigungsflansch eines Einspritzventils

Country Status (3)

Country Link
EP (1) EP0878622B1 (de)
DE (1) DE69816906T2 (de)
FR (1) FR2763379B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209650A1 (de) 2015-05-27 2016-12-01 Bayerische Motoren Werke Aktiengesellschaft Kraftstoffinjektor

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1306311B1 (it) 1998-07-01 2001-06-04 Magneti Marelli Spa Sistema di accoppiamento tra testata del motore,iniettore e collettorecarburante .
FR2807110B1 (fr) * 2000-03-30 2002-06-07 Renault Agencement pour la fixation d'un porte-injecteur de carburant
DE10025984B4 (de) * 2000-05-25 2014-07-03 Continental Automotive Gmbh Spannmittel zum Einspannen eines Einspritzventils
EP1239147A3 (de) * 2001-03-09 2008-02-20 Robert Bosch Gmbh Düsenhalterbefestigung
DE10125440A1 (de) * 2001-05-25 2002-11-28 Bosch Gmbh Robert Befestigungseinrichtung eines Injektors einer Kraftstoffeinspritzeinrichtung an einer Brennkraftmaschine
EP1764501A1 (de) * 2005-09-15 2007-03-21 Delphi Technologies, Inc. Vorrichtung zur Befestigung eines Brennstoffeinspritzventils
EP2041412B1 (de) * 2006-07-18 2015-09-16 Continental Automotive Canada, Inc. Montagehilfen für leerlaufluftsteuerventils
DE102007050512A1 (de) * 2007-10-23 2009-04-30 Volkswagen Ag Brennkraftmaschine mit Kraftstoffinjektoren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB448089A (en) * 1935-10-28 1936-06-02 Saurer Ag Adolph Improvements in and relating to internal combustion engines operating with fuel injection
AT293792B (de) * 1968-07-02 1971-10-25 Tatra Np Anordnung zur Leckkraftstoffabführung von der Düse eines Einspritzventils in Schwerölmotoren
GB8402997D0 (en) 1984-02-04 1984-03-07 Lucas Ind Plc Ic engine
FR2670534A1 (fr) * 1990-12-12 1992-06-19 Peugeot Dispositif de fixation d'un injecteur.
DE4315233A1 (de) * 1993-05-07 1994-07-28 Daimler Benz Ag Direkteinspritzende Brennkraftmaschine mit einem im Zylinderkopf zwischen Gaswechselventilen angeordneten Kraftstoffeinspritzventil
DE4318434A1 (de) * 1993-06-03 1994-12-08 Opel Adam Ag Haltevorrichtung für ein Kraftstoffeinspritzventil eines Dieselmotors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209650A1 (de) 2015-05-27 2016-12-01 Bayerische Motoren Werke Aktiengesellschaft Kraftstoffinjektor

Also Published As

Publication number Publication date
FR2763379B1 (fr) 1999-07-16
FR2763379A1 (fr) 1998-11-20
DE69816906T2 (de) 2004-07-15
EP0878622A1 (de) 1998-11-18
DE69816906D1 (de) 2003-09-11

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