EP3144518B1 - Arrangement for mounting an injector on a yoke by resilient fitting in a fixing flange - Google Patents

Arrangement for mounting an injector on a yoke by resilient fitting in a fixing flange Download PDF

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Publication number
EP3144518B1
EP3144518B1 EP16187166.0A EP16187166A EP3144518B1 EP 3144518 B1 EP3144518 B1 EP 3144518B1 EP 16187166 A EP16187166 A EP 16187166A EP 3144518 B1 EP3144518 B1 EP 3144518B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
injector
clamp
arrangement according
flange
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
EP16187166.0A
Other languages
German (de)
French (fr)
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EP3144518A1 (en
Inventor
Etienne De Malet
Jean-François Moulin
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Renault SAS
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Renault SAS
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Publication of EP3144518A1 publication Critical patent/EP3144518A1/en
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Publication of EP3144518B1 publication Critical patent/EP3144518B1/en
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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
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M2200/851—Mounting of fuel injection apparatus provisions for adjusting the angular, rotational or axial position 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
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
    • 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
    • F02M2200/853—Mounting of fuel injection apparatus involving use of quick-acting mechanism, e.g. clips
    • 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 invention relates to an arrangement for mounting an injector on a cylinder head of a heat engine of a motor vehicle.
  • the publications CN204493052 U , KR100527700 B1 and CN204493051 U show arrangements for mounting an injector on a cylinder head of a heat engine of a motor vehicle.
  • an injector generally has a generally cylindrical shape elongated along a main axis.
  • the injector can also be arranged in a cylindrical injector holder.
  • injector will refer to a single injector or to an assembly formed by the injector and the injector holder, where appropriate.
  • the injector has a first lower section which is intended to extend inside the cylinder head to a free lower end.
  • the free lower end has an injection nozzle which opens into the combustion chamber of the heat engine.
  • the nozzle is controlled to release one or more jets of fuel into the combustion chamber. It is common for fuel jets to be emitted with an inclination relative to the axis of the injector.
  • the injector also has a second upper section which is intended to extend above the upper face of the cylinder head of the heat engine.
  • This second section includes connection means with fuel supply and return pipes. It also has electrical connectors for controlling the injector.
  • the flange is mounted on the injector by transverse engagement in the lateral notches.
  • the lower section of the injector thus equipped with the flange is then inserted into a well of the cylinder head.
  • the flange is fixed to the cylinder head, generally by means of a screw with an axis parallel to that of the injector.
  • the engine compartments are increasingly congested.
  • the cylinder head of the engine has an increasingly compact upper face.
  • the various components carried by the cylinder head, in particular the camshafts, must therefore be housed in an increasingly reduced space.
  • the injectors have a length such that the upper section of the injector protrudes above the cylinder head cover by means of an insertion hole.
  • the insertion orifice has a diameter substantially equal to the diameter of the lower section of the injector, and a seal is arranged between the cylinder head cover and the injector.
  • the upper section of the injectors has a larger overall diameter than the lower section. The injector must therefore be inserted into the cylinder head well after positioning the cylinder head cover by passing through the insertion hole.
  • the fixing flanges of the injectors are preferably fixed to the cylinder head, either directly or by means of a shaft support. cams which is itself fixed flat against the top face of the cylinder head. Fixing the flanges to the cylinder head cover would not make it possible to obtain a sufficiently precise hold in position because the cylinder head cover is generally formed by a thin sheet or plastic plate which is liable to vibrate relative to the cylinder head during the engine operation.
  • the fixing flanges being positioned on the cylinder head before positioning the cylinder head cover, they are difficult to access when inserting the injector into the well. It is then impossible to fit the fork of the flange on the injector.
  • the invention provides an arrangement for fixing an injector to a cylinder head cover when the flange is inaccessible when the injector is inserted into the cylinder head well.
  • the invention naturally makes it possible to resolve other technical problems, in particular if it is desired to change the order of the injector mounting operations, for example to simplify the mass production of heat engines.
  • the invention provides an arrangement according to claim 1.
  • a cylinder head 10 of a motor vehicle heat engine which is intended to be fixed against a horizontal upper face of a cylinder block (not shown) to close at least one longitudinal row of 12 combustion chambers.
  • the upper part of a combustion chamber 12 is notably visible to the figures 2 and 3 .
  • Each combustion chamber 12 in a row has a cylindrical shape with a vertical "A" axis.
  • the axes "A" of the combustion chambers 12 of a row are aligned in the same vertical longitudinal plane which will hereinafter be called “alignment plane P".
  • the cylinder head 10 has a planar upper face 14 which is hollowed out with various cavities to receive several parts such as intake valves and exhaust valves (not shown).
  • the upper face 14 of the cylinder head 10 is also intended to support two camshafts 16 of longitudinal "B" axis which extend symmetrically on either side of the "P" plane of alignment as shown in Figure figure 4 .
  • the camshafts 16 are mounted to rotate about their axis "B" on the cylinder head 10 by means of a support 18, sometimes designated by the term "beam". As shown in the figure 5 , this support 18 is in the form of a rectangular horizontal plate thick enough to have high rigidity. The support 18 is thus delimited vertically by a lower horizontal face 20 and by an upper horizontal face 22.
  • the alignment plane “P" here intersects the support 18 along its median longitudinal axis.
  • the support 18 comprises bearings (not shown) to receive the two camshafts 16 in rotation.
  • the support 18 further has recesses which allow valve stems (not shown) to come into contact with the cams of the camshaft 16 via pawls.
  • the lower face 20 of the support 18 is pressed against the upper face 14 of the cylinder head 10.
  • the support 18 thus positioned is rigidly fixed with the cylinder head 10.
  • the upper horizontal face 22 of the support 18 is fixed. perfectly fixed relative to the upper face 14 of the cylinder head 10 over its entire surface.
  • a component fixed against the upper face 22 of the support 18 remains positioned perfectly fixed relative to the cylinder head 10 even during operation of the engine.
  • a cylinder head cover 24 covers the upper face 22 of the support 18, as illustrated in figures 1 and 4 .
  • the cylinder head cover 24 is in the form of a thin sheet of which two longitudinal edges 26 are curved downwards so as to come into contact with the upper face 22 of the support while the central part of the cylinder head cover 24 is arranged at a distance above the upper face 22 of the support 18 to enable the two camshafts 16 to be housed in a free space reserved between the cylinder head 10 and the cylinder head cover 24.
  • the cylinder head cover 24 is thus fixed to the support 18 via its two longitudinal edges 26.
  • the central part of the cylinder head cover 24 is arranged at a distance above the cylinder head. It is therefore subject to vibrations relative to the cylinder head 10 when the engine is in operation.
  • the injector 28 shown in figures 2 and 3 has a generally cylindrical shape with a vertical main axis.
  • the injector 28 is intended to be arranged coaxially with the axis "A" of the associated chamber 12. It comprises a first section 30 of the lower injection end which is intended to be arranged under the cylinder head cover 24 and a second end section 32 upper which is intended to be arranged above the cylinder head cover 24.
  • the lower section 30 has a fuel injection nozzle 34 at its free lower end.
  • the lower section 30 has a stepped shape from its free lower end to its larger upper end of maximum diameter "D1".
  • a lower part of this section 30 is intended to be inserted into a well 36 of the cylinder head 10 until a lower shoulder 38 bears axially against a seat 40 of the well 36.
  • the well 36 extends upwards. so as to pass through the support 18.
  • a washer is generally interposed between the shoulder 38 and the seat 40 to allow the height adjustment of the jets and to guarantee the seal.
  • the upper section 32 of the injector 28 has a larger radial size than the lower section 30.
  • This upper section 32 comprises means for connection with a reserve of pressurized fuel as well as electrical connectors to allow the control of the emission of the fuel jets.
  • the cylinder head cover 24 has an insertion orifice 41 of complementary shape to an upper end part of the lower section 30.
  • a seal is interposed radially between the lower section 30 and the cylinder head cover 24 to ensure the sealing of the space delimited between the cylinder head cover 24 and the cylinder head 10.
  • the upper section 32 and the lower section 30 cannot be dismantled with respect to each other or at least they must be mounted together prior to mounting the injector 28 on the cylinder head 10. Due to the radial size of the section 32 greater than the diameter of the insertion orifice 41, the injector 28 is necessarily inserted vertically into the well 36 after the cylinder head cover 24 has been positioned.
  • the injector 28 must be held firmly relative to the cylinder head 10 to prevent it from lifting from its seat 40 in reaction to the emission of a fuel jet and / or to the pressure exerted in operation. in the combustion chamber. Further, the injector 28 must also be angularly indexed so that the fuel jets are emitted in a predetermined direction.
  • the lower injection section 30 comprises an upper fixing portion comprising at least two lateral notches 42 opposite transversely, as illustrated in FIGS. figures 2 and 5 .
  • Each notch 42 is formed by a longitudinal groove, the bottom 44 of which forms a flat.
  • Each notch 42 is delimited vertically by a lower horizontal face 46 and by an upper horizontal face 48.
  • a fixing flange 50 is intended to cooperate with these notches 42 in order to hold and index the injector 28.
  • a flange 50 is in particular visible to figures 6 and 7 .
  • the flange 50 has a first front part in the form of a rigid fork 52.
  • the fork 52 has a horizontal section in the shape of a "U" whose opening is directed longitudinally forward.
  • the fork 52 thus comprises two longitudinal arms 54, the rear ends of which are linked by a half-ring 56.
  • the two longitudinal arms 54 of the fork 52 are spaced transversely by a distance greater than the largest diameter "D1" of the lower section 30 of the injector 28 so that said lower section 30 is able to slide axially between the arms 54.
  • the flange 50 also comprises a rear fixing part 58 which has the shape of a longitudinal sleeve which extends rearwardly from the half-ring 56.
  • This fixing part 58 is intended to be fixed to the cylinder head 10 by means of a single screw 60 with a vertical axis which is illustrated in figures 3 and 4 .
  • the fixing part 58 is crossed by an orifice 62 for the passage of the screw 60.
  • the flange 50 is arranged on the upper face 22 of the support 18 so that the fork 52 is in coincidence with the well 36.
  • a bore 63 is made through the support 18 and in the cylinder head 10 to receive the screw 60 for fixing the cylinder head. the flange 50.
  • two retaining elements 66 are each mounted to slide transversely in an associated arm 54. Each retaining element 66 is intended to be inserted into an associated lateral notch 42 to maintain the injector 28 vertically in position against its seat 40, as shown in figure 2 .
  • the two retaining elements 66 are identical by symmetry with respect to a median longitudinal vertical plane of the flange 50. Each retaining element 66 comprises a free internal transverse end 65 which is turned towards the injector 28.
  • each arm 54 has in its internal face 67 turned towards the opposite arm 54, a housing 68.
  • each housing 68 crosses transversely. the arm 54 to open into the outer face 70 of the arm.
  • the housing 68 here has a cylindrical shape with a transverse axis.
  • the two retaining elements 66 are mounted to slide transversely between a separated position (not shown) in which they are separated by a distance greater than the largest diameter "D1" of the injection section and a close position, illustrated in figures 2 , 6 , 7 and 8 , to which they are elastically recalled and in which each retaining element 66 is capable of being fitted transversely in the associated lateral notch 42.
  • each holding element 66 is here retracted transversely at least in part inside the housing 68, while in the close position, the holding elements 66 extend towards each other in projection transversely with respect to the associated arm 54.
  • each housing 68 has, at its internal mouth which opens into the internal face 67 of the arm, a flange 72 which reduces the section of the cylindrical housing 68. As shown in the figure 8 , an external transverse face of this rim 72 is intended to stop the associated retaining element 66 in the close position by cooperation with an associated abutment face 74 of the retaining element 66.
  • the retaining elements 66 are inserted into the associated housing 68 by its external mouth which opens into the outer face 70 of the arm 54.
  • a closing screw 76 closes the outer mouth of the housing 68.
  • the elastic return of the retaining elements 66 towards their close position is here achieved by interposing an elastic member in the housing 68 between the closing screw 76 and the associated retaining element 66.
  • the elastic member is here formed by a spring 80 mounted pre-stressed in compression. The prestressing force can advantageously be adjusted by acting on the closing screw 76.
  • each retaining element 66 is bevelled so as to form a ramp 82 directed vertically upwards.
  • This ramp 82 automatically controls the sliding of the retaining elements 66 towards their separated position by contact with the injector 28 during the vertical insertion downwards of the injection section 30 between the arms 54.
  • the retaining elements 66 thus operate in the manner of a door latch bolt. swinging.
  • Each retaining element 66 and the associated housing 68 generally have a cylindrical shape of revolution. To ensure that the ramp 82 is always oriented upwards, there is provided means for locking the element 66 in rotation relative to its housing 68.
  • the element 66 of holding is provided with a transverse groove 83 in its cylindrical face, here facing downwards, as illustrated in figure 9 .
  • a pin 84 is arranged so as to emerge vertically protruding from an inner cylindrical face of the housing 68 in order to penetrate into the groove 83 to block the element 66 for maintaining it in rotation during its sliding.
  • each retaining element 66 has an internal end face 86 which extends longitudinally, here reduced to the cut of a longitudinal edge. , which is intended to be pressed over its entire length against the bottom of the notch 42 of the injector.
  • the flange 50 is intended to be held in position by the loose screw 60 thus allowing limited pivoting of the flange 50 on the cylinder head 10. This makes it possible to facilitate the insertion of the injector 28 into the flange 50 and make up for any faulty positioning of the flange, in particular a fault in perpendicularity.
  • the upper periphery of the passage orifice 62 advantageously has the shape of a concave bowl 88. while a compensation washer 90 having a lower face of complementary convex shape. The washer 90 is interposed between the head of the fixing screw 60 and the flange 50 so that its convex face is received in the cup 88.
  • an elastic return member 92 is interposed between the yoke 10 and the fork 52.
  • This is a cylindrical spring which is arranged around the well 36 and which has a diameter greater than that of the lower section of the injector 28.
  • This spring is for example inserted into a counterbore 94 which is produced around the well 36 and which opens into the upper face of the support 18. This counterbore 94 keeps the spring 92 in position.
  • the elastic return member 92 also makes it possible to prevent sagging of the flange 50 during the insertion of the injector 28.
  • the retaining elements 66 When mounting the fixing flange 50, the retaining elements 66 are first of all inserted into their associated housing 68 through the external mouth. Then, the spring 80 is inserted into the housing 68 in the same way. Finally, the closing screws 76 are screwed to plug the external mouth of the housing, while allowing the springs 80 to be pre-stressed so as to elastically return the retaining elements 66 to their close position.
  • the elastic return member 92 is inserted into the counterbore 94. Then, the flange 50 is positioned longitudinally between the two camshafts 16 so that the fork 52 is in coincidence. with the well 36 and so that the passage orifice 62 is in coincidence with the bore 63. The elastic return member 92 is thus interposed between the fork 52 and the cylinder head 10.
  • the fixing screw 60 is inserted into the passage opening 62 and screwed into the bore 63, without however being tightened so as to allow the limited pivoting of the flange 50 relative to the cylinder head 10. This will subsequently facilitate the insertion of the injector 28 into the well 36.
  • a third step “E3” for mounting the cylinder head cover 24 is initiated.
  • the cylinder head cover 24 is positioned and fixed to the cylinder head 10 by covering the flange 50 as well as the camshafts 16.
  • a fourth step “E4” for inserting the injector 28 is carried out.
  • the lower section 30 of the injector 28 is inserted vertically downwards into the hole 41 for inserting the cylinder head cover 24.
  • the lower section 30 then passes between the arms 54 of the fork 52 in pressing the ramp 84 of the retaining elements 66. This automatically causes the sliding of the holding elements 66 towards their separated position against the elastic return force allowing the insertion of the injector 28 between the arms 54 of the fork 52 to continue.
  • the insertion continues until the injector 28 is resting on its seat 40.
  • the fork 52 is simultaneously pushed upwards to its fixing position by the spring 92.
  • the side notches 42 of the injector 28 are then at the level of the retaining elements 66 and the retaining elements 66 are then free to be fitted elastically in the lateral notches 42.
  • the fixing screw 60 is tightened to rigidly fix the flange 50 on the cylinder head 10.
  • an access passage 96 is provided in the cylinder head cover 24 for inserting a tool such as a torque wrench.
  • the access passage 96 is plugged with a plug 98 in a sealed manner during a sixth plugging step “E6”.
  • Each retaining element 66 comprises a lower horizontal stop face 100 which blocks the upward vertical sliding of the injector 28 by cooperation with the lower face 46 of the lateral notch 42 to keep the injector 28 resting against its seat. 40. The injector 28 can therefore no longer be withdrawn vertically.
  • planar face 86 at the end of the retaining element 66 makes it possible to prevent the rotation of the injector 28 about its axis "A".
  • the fixing screw 60 is completely unscrewed by passing a tool through the passage 96 for accessing the cylinder head cover 24. Then the cylinder head cover 24 is itself removed. The assembly formed by the cylinder head cover 24, the flange 50 and the injector 28 is then withdrawn from the cylinder head 10. An operator can then access the flange 50 thus making it possible to remove it by sliding longitudinally relative to the injector. 28.
  • the injector 28 can then be extracted from the orifice 41 for inserting the cylinder head cover 24 by vertical sliding upwards.
  • the arrangement made according to the state of the art thus makes it possible to position the flange 50 on the cylinder head 10 before the injector 28 is inserted into the well 36. This allows in particular to easily fix the injector 28 when the flange 50 is not accessible.

Description

DOMAINE TECHNIQUE DE L'INVENTIONTECHNICAL FIELD OF THE INVENTION

L'invention concerne un agencement pour le montage d'un injecteur sur une culasse de moteur thermique de véhicule automobile.The invention relates to an arrangement for mounting an injector on a cylinder head of a heat engine of a motor vehicle.

L'invention concerne plus particulièrement un agencement pour le montage d'un injecteur sur une culasse de moteur thermique d'un véhicule automobile, l'injecteur présentant un axe principal vertical et comportant un tronçon d'extrémité inférieure d'injection qui est destiné à être inséré dans un puits de la culasse, le tronçon d'injection comportant au moins deux encoches latérales opposées transversalement, l'agencement comportant une bride de fixation qui comporte :

  • deux éléments de maintien qui sont destinés à être insérés dans les encoches latérales pour maintenir l'injecteur verticalement dans le puits ;
  • une partie de fixation qui est destinée à être fixée à la culasse.
The invention relates more particularly to an arrangement for mounting an injector on a cylinder head of a heat engine of a motor vehicle, the injector having a vertical main axis and comprising a lower injection end section which is intended for be inserted in a well of the cylinder head, the injection section comprising at least two lateral notches opposite transversely, the arrangement comprising a fixing flange which comprises:
  • two retaining elements which are intended to be inserted into the lateral notches to maintain the injector vertically in the well;
  • a fixing part which is intended to be fixed to the cylinder head.

ARRIERE PLAN TECHNIQUE DE L'INVENTIONTECHNICAL BACKGROUND OF THE INVENTION

Il est connu d'équiper les moteurs thermiques de véhicules automobiles avec des injecteurs de carburant. Ces injecteurs permettent de doser la quantité de carburant injectée dans une chambre de combustion du moteur et de synchroniser très précisément le moment et la durée de chaque injection avec la position d'un piston coulissant dans la chambre de combustion.It is known practice to equip thermal engines of motor vehicles with fuel injectors. These injectors make it possible to measure the quantity of fuel injected into a combustion chamber of the engine and to synchronize very precisely the moment and duration of each injection with the position of a sliding piston in the combustion chamber.

Les publications CN204493052 U , KR100527700 B1 et CN204493051 U montrent des agencements pour le montage d'un injecteur sur une culasse de moteur thermique d'un véhicule automobile.The publications CN204493052 U , KR100527700 B1 and CN204493051 U show arrangements for mounting an injector on a cylinder head of a heat engine of a motor vehicle.

De manière connue, un injecteur présente généralement une forme globalement cylindrique allongée selon un axe principal. L'injecteur peut aussi être disposé dans un porte-injecteur de forme cylindrique. Dans la suite de la description et dans les revendications, le terme "injecteur" se rapportera à un injecteur seul ou à un ensemble formé par l'injecteur et le porte-injecteur le cas échéant.In known manner, an injector generally has a generally cylindrical shape elongated along a main axis. The injector can also be arranged in a cylindrical injector holder. In the remainder of the description and in the claims, the term “injector” will refer to a single injector or to an assembly formed by the injector and the injector holder, where appropriate.

L'injecteur présente un premier tronçon inférieur qui est destiné à s'étendre à l'intérieur de la culasse jusqu'à une extrémité inférieure libre. L'extrémité inférieure libre comporte une buse d'injection qui débouche dans la chambre à combustion du moteur thermique. La buse est commandée pour libérer un ou plusieurs jets de carburant dans la chambre de combustion. Il est courant que les jets de carburant soient émis avec une inclinaison par rapport à l'axe de l'injecteur.The injector has a first lower section which is intended to extend inside the cylinder head to a free lower end. The free lower end has an injection nozzle which opens into the combustion chamber of the heat engine. The nozzle is controlled to release one or more jets of fuel into the combustion chamber. It is common for fuel jets to be emitted with an inclination relative to the axis of the injector.

L'injecteur présente aussi un deuxième tronçon supérieur qui est destinée à s'étendre au-dessus de la face supérieure de la culasse du moteur thermique. Ce deuxième tronçon comporte des moyens de raccordement avec des conduites d'alimentation et de retour de carburant. Il comporte aussi des connecteurs électriques pour permettre la commande de l'injecteur.The injector also has a second upper section which is intended to extend above the upper face of the cylinder head of the heat engine. This second section includes connection means with fuel supply and return pipes. It also has electrical connectors for controlling the injector.

Dans le cas d'un moteur thermique à injection directe, c'est-à-dire dans lequel les jets de carburant sont émis directement dans la chambre de combustion, le positionnement de l'injecteur par rapport à la chambre de combustion doit être extrêmement précis afin que chaque jet de carburant soit émis dans une direction précise. Ceci implique de maintenir en position l'injecteur par rapport à la culasse.In the case of a heat engine with direct injection, that is to say in which the fuel jets are emitted directly into the combustion chamber, the positioning of the injector relative to the combustion chamber must be extremely precise so that each jet of fuel is emitted in a precise direction. This involves keeping the injector in position relative to the cylinder head.

Ceci est fait selon l'état de la technique en prévoyant une bride présentant une extrémité en forme de fourchette qui vient s'engager transversalement dans des encoches latérales de l'injecteur. Des bras de la fourchette coopèrent avec les encoches pour maintenir axialement l'injecteur en position dans la culasse.This is done according to the state of the art by providing a flange having a fork-shaped end which engages transversely in the lateral notches of the injector. Arms of the fork cooperate with the notches to axially maintain the injector in position in the cylinder head.

Afin d'empêcher la rotation de l'injecteur par rapport à la fourche, il est connu de prévoir des méplats en fond d'encoche. Ces méplats coopèrent avec les bras de la fourchette pour assurer l'indexage en rotation de l'injecteur.In order to prevent the injector from rotating relative to the fork, it is known to provide flats at the bottom of the notch. These flats cooperate with the arms of the fork to ensure the rotational indexing of the injector.

Dans les brides de fixation réalisées selon l'état de la technique, la bride est montée sur l'injecteur par emboîtement transversal dans les encoches latérales. Le tronçon inférieur de l'injecteur ainsi équipé de la bride est ensuite inséré dans un puits de la culasse. Puis la bride est fixée à la culasse, généralement au moyen d'une vis d'axe parallèle à celui de l'injecteur.In the fixing flanges produced according to the state of the art, the flange is mounted on the injector by transverse engagement in the lateral notches. The lower section of the injector thus equipped with the flange is then inserted into a well of the cylinder head. Then the flange is fixed to the cylinder head, generally by means of a screw with an axis parallel to that of the injector.

Un tel agencement de fixation réalisé selon l'état de la technique est tout à fait satisfaisant lorsque la bride est accessible pour permettre la fixation de l'injecteur.Such a fixing arrangement produced according to the state of the art is entirely satisfactory when the flange is accessible to allow the fixing of the injector.

Or, les compartiments moteurs sont de plus en plus encombrés. Dans ce contexte, on cherche à réduire l'encombrement du moteur. De ce fait, la culasse du moteur présente une face supérieure de plus en plus compacte. Les différents composants portés par la culasse, notamment les arbres à cames, doivent donc être logés dans un espace de plus en plus réduit.However, the engine compartments are increasingly congested. In this context, we seek to reduce the size of the engine. As a result, the cylinder head of the engine has an increasingly compact upper face. The various components carried by the cylinder head, in particular the camshafts, must therefore be housed in an increasingly reduced space.

Dans ce contexte, on a proposé une conception de moteur dans laquelle le pourtour du couvre-culasse est agencé à distance au-dessus de la culasse. Le couvre-culasse doit être fixé de manière étanche à la culasse pour éviter que de l'huile de lubrification des composants mobiles portés par la culasse ne sorte à l'extérieur de l'espace délimité entre la culasse et le couvre-culasse. Cette étanchéité permet aussi d'éviter que lesdits composants mobiles soient encrassés par des particules extérieures.In this context, an engine design has been proposed in which the circumference of the cylinder head cover is arranged remotely above the cylinder head. The cylinder head cover must be fixed in a sealed manner to the cylinder head to prevent lubricating oil from the moving components carried by the cylinder head escaping outside the space defined between the cylinder head and the cylinder head cover. This sealing also makes it possible to prevent said moving components from becoming clogged with external particles.

Les injecteurs présentent une longueur telle que le tronçon supérieur de l'injecteur dépasse au-dessus du couvre-culasse à la faveur d'un orifice d'insertion. Afin de pouvoir préserver l'étanchéité du couvre-culasse, l'orifice d'insertion présente un diamètre sensiblement égal au diamètre du tronçon inférieur de l'injecteur, et un joint est agencé entre le couvre-culasse et l'injecteur.The injectors have a length such that the upper section of the injector protrudes above the cylinder head cover by means of an insertion hole. In order to be able to preserve the tightness of the cylinder head cover, the insertion orifice has a diameter substantially equal to the diameter of the lower section of the injector, and a seal is arranged between the cylinder head cover and the injector.

Le tronçon supérieur des injecteurs présente un diamètre global plus important que le tronçon inférieur. L'injecteur doit donc être inséré dans le puits de la culasse après le positionnement du couvre-culasse en passant à travers l'orifice d'insertion.The upper section of the injectors has a larger overall diameter than the lower section. The injector must therefore be inserted into the cylinder head well after positioning the cylinder head cover by passing through the insertion hole.

En outre, pour permettre un maintien en position précis de l'injecteur par rapport à la culasse, les brides de fixation des injecteurs sont de préférence fixées à la culasse, soit directement, soit par l'intermédiaire d'un support d'arbres à cames qui est lui-même fixé à plat contre la face supérieure de la culasse. La fixation des brides au couvre-culasse ne permettrait pas d'obtenir un maintien en position suffisamment précis car le couvre-culasse est généralement formé par une plaque en tôle fine ou en matière plastique qui est susceptible de vibrer par rapport à la culasse pendant le fonctionnement du moteur.In addition, to enable the injector to be kept in precise position relative to the cylinder head, the fixing flanges of the injectors are preferably fixed to the cylinder head, either directly or by means of a shaft support. cams which is itself fixed flat against the top face of the cylinder head. Fixing the flanges to the cylinder head cover would not make it possible to obtain a sufficiently precise hold in position because the cylinder head cover is generally formed by a thin sheet or plastic plate which is liable to vibrate relative to the cylinder head during the engine operation.

Cependant, les brides de fixation étant positionnées sur la culasse avant le positionnement du couvre-culasse, elles sont difficilement accessibles lors de l'insertion de l'injecteur dans le puits. Il est alors impossible d'emboîter la fourchette de la bride sur l'injecteur.However, the fixing flanges being positioned on the cylinder head before positioning the cylinder head cover, they are difficult to access when inserting the injector into the well. It is then impossible to fit the fork of the flange on the injector.

L'invention propose un agencement pour la fixation d'un injecteur sur un couvre-culasse lorsque la bride est inaccessible au moment de l'insertion de l'injecteur dans le puits de culasse.The invention provides an arrangement for fixing an injector to a cylinder head cover when the flange is inaccessible when the injector is inserted into the cylinder head well.

L'invention permet bien entendu de résoudre d'autres problèmes techniques, notamment si l'on souhaite changer l'ordre des opérations de montage d'injecteur, par exemple pour simplifier la fabrication en série des moteurs thermiques.The invention naturally makes it possible to resolve other technical problems, in particular if it is desired to change the order of the injector mounting operations, for example to simplify the mass production of heat engines.

BREF RESUME DE L'INVENTIONBRIEF SUMMARY OF THE INVENTION

Pour résoudre notamment ces problèmes, l'invention propose un agencement selon la revendication 1.In order to solve these problems in particular, the invention provides an arrangement according to claim 1.

Selon d'autres caractéristiques de l'agencement selon l'invention :

  • les éléments de maintien comportent une face inférieure de butée qui bloque le coulissement vertical vers le haut de l'injecteur par rapport à la bride lorsque les éléments de maintien sont emboîtés dans les encoches latérales ;
  • chaque élément de maintien comporte une face plane d'extrémité libre qui s'étend longitudinalement pour bloquer la rotation de l'injecteur par contact avec un fond plan de l'encoche ;
  • la partie de fixation de la bride est susceptible d'être fixée sur la culasse par l'intermédiaire d'une vis d'axe vertical ;
  • une rondelle de compensation à rotule est interposée entre une tête de la vis et la bride pour permettre un pivotement de la bride par rapport à la culasse lorsque la vis n'est pas serrée ;
  • un organe de rappel élastique travaillant en compression est interposé entre la fourchette de la bride et la culasse afin de permettre un maintien avec mouvement limité de la bride en position sur la culasse avant la fixation de la bride sur la culasse ;
  • un couvre-culasse est agencé au-dessus de la culasse, la bride étant interposée entre la culasse et le couvre-culasse, le couvre-culasse comportant un orifice d'insertion de l'injecteur qui est agencé en coïncidence avec le puits ;
  • le couvre-culasse comporte un passage d'accès à la partie de fixation de la bride ;
  • la bride est fixée à la culasse par l'intermédiaire d'un support d'arbres à cames qui est lui-même fixé directement sur la culasse.
According to other characteristics of the arrangement according to the invention:
  • the retaining elements comprise a lower abutment face which blocks the upward vertical sliding of the injector relative to the flange when the retaining elements are fitted into the lateral notches;
  • each retaining element comprises a flat free end face which extends longitudinally to block the rotation of the injector by contact with a flat bottom of the notch;
  • the fixing part of the flange is capable of being fixed to the cylinder head by means of a screw with a vertical axis;
  • a ball joint compensation washer is interposed between a head of the screw and the flange to allow pivoting of the flange relative to the cylinder head when the screw is not tight;
  • an elastic return member working in compression is interposed between the fork of the flange and the cylinder head in order to allow a holding with limited movement of the flange in position on the cylinder head before fixing the flange on the cylinder head;
  • a cylinder head cover is arranged above the cylinder head, the flange being interposed between the cylinder head and the cylinder head cover, the cylinder head cover comprising an orifice for inserting the injector which is arranged in coincidence with the well;
  • the cylinder head cover has an access passage to the fixing part of the flange;
  • the flange is fixed to the cylinder head by means of a camshaft support which is itself fixed directly to the cylinder head.

L'invention propose aussi un procédé de mise en œuvre de l'agencement réalisé selon les enseignements de l'invention, caractérisé en ce qu'il comporte successivement les étapes suivantes :

  • une première étape de positionnement la bride sur la culasse avec interposition de l'organe de rappel élastique entre la fourchette et la culasse ;
  • une deuxième étape de maintien en position de la bride au moyen d'une vis non serrée de manière à conserver un pivotement limité de la bride par rapport à la culasse ;
  • une troisième étape de montage du couvre-culasse sur la culasse ;
  • une quatrième étape d'insertion du tronçon d'injection dans l'orifice d'insertion du couvre-culasse et dans le puits de la culasse jusqu'à emboîtement élastique des éléments de maintien dans les encoches latérales ;
  • une cinquième étape de fixation rigide de la bride sur la culasse qui consiste à serrer la vis en passant un outil adapté par le passage d'accès ;
  • une sixième étape (E6) de bouchage au cours de laquelle le passage (96) d'accès est rebouché de manière étanche avec un bouchon (98).
The invention also proposes a method for implementing the arrangement produced according to the teachings of the invention, characterized in that it successively comprises the following steps:
  • a first step of positioning the flange on the cylinder head with the interposition of the elastic return member between the fork and the cylinder head;
  • a second step of maintaining the flange in position by means of a loose screw so as to maintain a limited pivoting of the flange relative to the cylinder head;
  • a third step of mounting the cylinder head cover on the cylinder head;
  • a fourth step of inserting the injection section into the insertion orifice of the cylinder head cover and into the cylinder head well until the retaining elements engage resiliently in the side notches;
  • a fifth step of rigid fixing of the flange on the cylinder head which consists in tightening the screw by passing a suitable tool through the access passage;
  • a sixth plugging step (E6) during which the access passage (96) is sealed with a plug (98).

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

D'autres caractéristiques et avantages de l'invention apparaitront au cours de la lecture de la description détaillée qui va suivre pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une vue en perspective qui représente une culasse qui est recouverte d'un couvre-culasse et qui est équipée d'un injecteur monté selon un agencement réalisé selon les enseignements de l'invention ;
  • la figure 2 est une vue en coupe transversale axiale selon le plan de coupe 2-2 de la figure 1 qui représente l'injecteur monté dans la culasse au moyen d'une bride réalisée selon les enseignements de l'invention ;
  • la figure 3 est une vue en coupe longitudinale axiale selon le plan de coupe 3-3 de la figure 1 qui représente l'injecteur monté dans la culasse au moyen d'une bride réalisée selon les enseignements de l'invention ;
  • la figure 4 est une vue en coupe transversale axiale selon le plan de coupe 4-4 de la figure 1 qui représente les moyens de fixation de la bride sur la culasse ;
  • la figure 5 est une vue en perspective qui représente l'injecteur monté sur un support d'arbre à cames équipant la culasse de la figure 1 par l'intermédiaire d'une bride réalisée selon les enseignements de l'invention ;
  • la figure 6 est une vue en perspective à plus grande échelle qui représente la bride de fixation de l'injecteur réalisée selon les enseignements de l'invention ;
  • la figure 7 est une vue de dessus qui représente la bride de la figure 6 ;
  • la figure 8 est une vue en coupe selon le plan de coupe 8-8 de la figure 7 qui représente les éléments de maintien montés coulissants dans des bras de la bride ;
  • la figure 9 est une vue en coupe selon le plan de coupe 9-9 de la figure 8 qui représente des moyens de blocage en rotation des éléments de maintien de la bride ;
Other characteristics and advantages of the invention will become apparent on reading the detailed description which follows, for the understanding of which reference is made to the appended drawings in which:
  • the figure 1 is a perspective view which shows a cylinder head which is covered with a cylinder head cover and which is equipped with an injector mounted according to an arrangement made according to the teachings of the invention;
  • the figure 2 is an axial cross-sectional view along the section plane 2-2 of the figure 1 which represents the injector mounted in the cylinder head by means of a flange produced according to the teachings of the invention;
  • the figure 3 is a view in axial longitudinal section along the section plane 3-3 of the figure 1 which represents the injector mounted in the cylinder head by means of a flange produced according to the teachings of the invention;
  • the figure 4 is an axial cross-sectional view along the section plane 4-4 of the figure 1 which represents the means of fixing the flange on the cylinder head;
  • the figure 5 is a perspective view which shows the injector mounted on a camshaft support fitted to the cylinder head of the figure 1 by means of a flange produced according to the teachings of the invention;
  • the figure 6 is a perspective view on a larger scale which shows the fixing flange of the injector produced according to the teachings of the invention;
  • the figure 7 is a top view showing the flange of the figure 6 ;
  • the figure 8 is a sectional view along section 8-8 of the figure 7 which shows the retaining elements slidably mounted in the arms of the flange;
  • the figure 9 is a sectional view along section 9-9 of the figure 8 which represents means for blocking in rotation the retaining elements of the flange;

DESCRIPTION DETAILLEE DES FIGURESDETAILED DESCRIPTION OF THE FIGURES

Dans la suite de la description, des éléments présentant une structure identique ou des fonctions analogues seront désignés par des mêmes références.In the remainder of the description, elements having an identical structure or similar functions will be designated by the same references.

Dans la suite de la description, on adoptera à titre non limitatif des orientations longitudinale dirigée d'arrière en avant, verticale dirigée de bas en haut et transversale dirigée de gauche à droite. Ces orientations sont utilisées uniquement à titre de repère géométrique pour simplifier la compréhension de la description et des revendications. La direction verticale est de ce fait indépendante de la direction de la gravité. Un plan horizontal est défini comme étant orthogonal à la direction verticale.In the remainder of the description, longitudinal orientations directed from rear to front, vertical directed from bottom to top and transverse directed from left to right will be adopted without limitation. These orientations are used only as a geometric reference to simplify the understanding of the description and the claims. The vertical direction is therefore independent of the direction of gravity. A horizontal plane is defined as being orthogonal to the vertical direction.

Le terme "interne" sera utilisé pour désigner un élément de la fourchette 52 tourné vers l'espace embrassé par les bras 54 de la fourchette 52, tandis que le terme "externe" sera utilisé pour désigner des éléments tournés vers une direction opposée.The term "internal" will be used to denote an element of the fork 52 facing the space embraced by the arms 54 of the fork 52, while the term "external" will be used to denote elements facing in an opposite direction.

On a représenté à la figure 1 une culasse 10 de moteur thermique de véhicule automobile qui est destinée à être fixée contre une face supérieure horizontale d'un bloc-cylindres (non représenté) pour fermer au moins une rangée longitudinale de chambres 12 de combustion. La partie supérieure d'une chambre 12 de combustion est notamment visible aux figures 2 et 3.We represented at the figure 1 a cylinder head 10 of a motor vehicle heat engine which is intended to be fixed against a horizontal upper face of a cylinder block (not shown) to close at least one longitudinal row of 12 combustion chambers. The upper part of a combustion chamber 12 is notably visible to the figures 2 and 3 .

Chaque chambre 12 de combustion d'une rangée présente une forme cylindrique d'axe "A" vertical. Les axes "A" des chambres 12 de combustion d'une rangée sont alignés dans un même plan longitudinal vertical qui sera par la suite appelé "plan d'alignement P".Each combustion chamber 12 in a row has a cylindrical shape with a vertical "A" axis. The axes "A" of the combustion chambers 12 of a row are aligned in the same vertical longitudinal plane which will hereinafter be called "alignment plane P".

La culasse 10 comporte une face 14 supérieure plane qui est creusée de diverses cavités pour recevoir plusieurs pièces telles que des soupapes d'admission et des soupapes d'échappement (non représentées).The cylinder head 10 has a planar upper face 14 which is hollowed out with various cavities to receive several parts such as intake valves and exhaust valves (not shown).

La face 14 supérieure de la culasse 10 est aussi destinée à supporter deux arbres 16 à cames d'axe "B" longitudinal qui s'étendent symétriquement de part et d'autre du plan "P" d'alignement comme cela est représenté à la figure 4.The upper face 14 of the cylinder head 10 is also intended to support two camshafts 16 of longitudinal "B" axis which extend symmetrically on either side of the "P" plane of alignment as shown in Figure figure 4 .

Les arbres 16 à cames sont montés rotatifs autour de leur axe "B" sur la culasse 10 par l'intermédiaire d'un support 18, parfois désigné par le terme "poutre". Comme représenté à la figure 5, ce support 18 se présente sous la forme d'une plaque horizontale rectangulaire suffisamment épaisse pour présenter une rigidité élevée. Le support 18 est ainsi délimité verticalement par une face 20 horizontale inférieure et par une face 22 horizontale supérieure. Le plan "P" d'alignement coupe ici le support 18 selon son axe longitudinal médian.The camshafts 16 are mounted to rotate about their axis "B" on the cylinder head 10 by means of a support 18, sometimes designated by the term "beam". As shown in the figure 5 , this support 18 is in the form of a rectangular horizontal plate thick enough to have high rigidity. The support 18 is thus delimited vertically by a lower horizontal face 20 and by an upper horizontal face 22. The alignment plane "P" here intersects the support 18 along its median longitudinal axis.

Le support 18 comporte des paliers (non représentés) pour recevoir à rotation les deux arbres 16 à cames. Le support 18 présente en outre des évidements qui permettent à des queues de soupape (non représentées) de venir en contact avec les cames de l'arbre 16 à cames par l'intermédiaire de linguets.The support 18 comprises bearings (not shown) to receive the two camshafts 16 in rotation. The support 18 further has recesses which allow valve stems (not shown) to come into contact with the cams of the camshaft 16 via pawls.

La face 20 inférieure du support 18 est plaquée contre la face 14 supérieure de la culasse 10. Le support 18 ainsi positionné est fixé de manière rigide avec la culasse 10. De cette manière, la face 22 horizontale supérieure du support 18 est parfaitement fixe par rapport à la face 14 supérieure de la culasse 10 sur toute sa surface. Ainsi, un composant fixé contre la face 22 supérieure du support 18 demeure positionné de manière parfaitement fixe par rapport à la culasse 10 même pendant le fonctionnement du moteur.The lower face 20 of the support 18 is pressed against the upper face 14 of the cylinder head 10. The support 18 thus positioned is rigidly fixed with the cylinder head 10. In this way, the upper horizontal face 22 of the support 18 is fixed. perfectly fixed relative to the upper face 14 of the cylinder head 10 over its entire surface. Thus, a component fixed against the upper face 22 of the support 18 remains positioned perfectly fixed relative to the cylinder head 10 even during operation of the engine.

Un couvre-culasse 24 recouvre la face 22 supérieure du support 18, comme cela est illustré aux figures 1 et 4. Le couvre-culasse 24 se présente sous la forme d'une tôle fine dont deux bords 26 longitudinaux sont recourbés vers le bas de manière à venir en contact avec la face 22 supérieure du support tandis que la partie centrale du couvre-culasse 24 est agencée à distance au-dessus de la face 22 supérieure du support 18 pour permettre de loger les deux arbres 16 à cames dans un espace libre réservé entre la culasse 10 et le couvre-culasse 24. Le couvre-culasse 24 est ainsi fixé au support 18 par l'intermédiaire de ses deux bords 26 longitudinaux.A cylinder head cover 24 covers the upper face 22 of the support 18, as illustrated in figures 1 and 4 . The cylinder head cover 24 is in the form of a thin sheet of which two longitudinal edges 26 are curved downwards so as to come into contact with the upper face 22 of the support while the central part of the cylinder head cover 24 is arranged at a distance above the upper face 22 of the support 18 to enable the two camshafts 16 to be housed in a free space reserved between the cylinder head 10 and the cylinder head cover 24. The cylinder head cover 24 is thus fixed to the support 18 via its two longitudinal edges 26.

La partie centrale du couvre-culasse 24 est agencée à distance au-dessus de la culasse. Elle est de ce fait sujette à des vibrations par rapport à la culasse 10 lorsque le moteur est en fonctionnement.The central part of the cylinder head cover 24 is arranged at a distance above the cylinder head. It is therefore subject to vibrations relative to the cylinder head 10 when the engine is in operation.

Des injecteurs 28 sont agencés sur la culasse 10. Pour des raisons de clarté des dessins, on a représenté aux figures un seul injecteur 28 agencé sur la culasse 10. On comprendra néanmoins qu'un tel moteur comporte plusieurs injecteurs 28 dont chacun est associé à une chambre 12 de combustion. Tous les injecteurs 28 du moteur sont identiques et ils sont agencés de manière similaire sur la culasse 10.Injectors 28 are arranged on the cylinder head 10. For reasons of clarity of the drawings, there is shown in the figures a single injector 28 arranged on the cylinder head 10. It will nevertheless be understood that such an engine comprises several injectors 28 each of which is associated with a combustion chamber 12. All the injectors 28 of the engine are identical and they are arranged in a similar manner on the cylinder head 10.

L'injecteur 28 représenté aux figures 2 et 3 présente une forme globalement cylindrique d'axe principal vertical. L'injecteur 28 est destiné à être agencé coaxialement avec l'axe "A" de la chambre 12 associée. Il comporte un premier tronçon 30 d'extrémité inférieure d'injection qui est destiné à être agencé sous le couvre-culasse 24 et un deuxième tronçon 32 d'extrémité supérieure qui est destiné à être agencé au-dessus du couvre-culasse 24.The injector 28 shown in figures 2 and 3 has a generally cylindrical shape with a vertical main axis. The injector 28 is intended to be arranged coaxially with the axis "A" of the associated chamber 12. It comprises a first section 30 of the lower injection end which is intended to be arranged under the cylinder head cover 24 and a second end section 32 upper which is intended to be arranged above the cylinder head cover 24.

Le tronçon 30 inférieur comporte une buse 34 d'injection de carburant à son extrémité inférieure libre. Le tronçon 30 inférieur présente une forme étagée depuis son extrémité inférieure libre jusqu'à son extrémité supérieure plus large de diamètre "D1" maximal. Une partie inférieure de ce tronçon 30 est destinée à être insérée dans un puits 36 de la culasse 10 jusqu'à ce qu'un épaulement 38 inférieur soit en appui axial contre un siège 40 du puits 36. Le puits 36 se prolonge vers le haut de manière à traverser le support 18. Bien que cela ne soit pas représenté aux figures, une rondelle est généralement interposée entre l'épaulement 38 et le siège 40 pour permettre le réglage en hauteur des jets et pour garantir l'étanchéité.The lower section 30 has a fuel injection nozzle 34 at its free lower end. The lower section 30 has a stepped shape from its free lower end to its larger upper end of maximum diameter "D1". A lower part of this section 30 is intended to be inserted into a well 36 of the cylinder head 10 until a lower shoulder 38 bears axially against a seat 40 of the well 36. The well 36 extends upwards. so as to pass through the support 18. Although this is not shown in the figures, a washer is generally interposed between the shoulder 38 and the seat 40 to allow the height adjustment of the jets and to guarantee the seal.

Le tronçon 32 supérieur de l'injecteur 28 présente un encombrement radial plus important que le tronçon 30 inférieur. Ce tronçon 32 supérieur comporte des moyens de raccordement avec une réserve de carburant sous pression ainsi que des connecteurs électrique pour permettre la commande de l'émission des jets de carburant.The upper section 32 of the injector 28 has a larger radial size than the lower section 30. This upper section 32 comprises means for connection with a reserve of pressurized fuel as well as electrical connectors to allow the control of the emission of the fuel jets.

Le couvre-culasse 24 comporte un orifice 41 d'insertion de forme complémentaire d'une partie d'extrémité supérieure du tronçon 30 inférieur. Un joint d'étanchéité est interposé radialement entre le tronçon 30 inférieur et le couvre-culasse 24 pour garantir l'étanchéité de l'espace délimité entre le couvre-culasse 24 et la culasse 10.The cylinder head cover 24 has an insertion orifice 41 of complementary shape to an upper end part of the lower section 30. A seal is interposed radially between the lower section 30 and the cylinder head cover 24 to ensure the sealing of the space delimited between the cylinder head cover 24 and the cylinder head 10.

Dans le mode de réalisation représenté aux figures, le tronçon 32 supérieur et le tronçon 30 inférieur sont indémontables l'un par rapport à l'autre ou tout au moins ils doivent être montés ensemble préalablement au montage de l'injecteur 28 sur la culasse 10. Du fait de l'encombrement radial du tronçon 32 supérieur au diamètre de l'orifice 41 d'insertion, l'injecteur 28 est nécessairement inséré verticalement dans le puits 36 après que le couvre-culasse 24 ait été positionné.In the embodiment shown in the figures, the upper section 32 and the lower section 30 cannot be dismantled with respect to each other or at least they must be mounted together prior to mounting the injector 28 on the cylinder head 10. Due to the radial size of the section 32 greater than the diameter of the insertion orifice 41, the injector 28 is necessarily inserted vertically into the well 36 after the cylinder head cover 24 has been positioned.

Par ailleurs, l'injecteur 28 doit être maintenu fermement par rapport à la culasse 10 pour éviter qu'il ne se soulève de son siège 40 en réaction à l'émission d'un jet de carburant et/ou à la pression exercée en fonctionnement dans la chambre de combustion. En outre, l'injecteur 28 doit aussi être indexé angulairement pour que les jets de carburant soient émis dans une direction prédéterminée.Furthermore, the injector 28 must be held firmly relative to the cylinder head 10 to prevent it from lifting from its seat 40 in reaction to the emission of a fuel jet and / or to the pressure exerted in operation. in the combustion chamber. Further, the injector 28 must also be angularly indexed so that the fuel jets are emitted in a predetermined direction.

Pour permettre le maintien et l'indexation de l'injecteur 28, le tronçon 30 inférieur d'injection comporte une portion supérieure de fixation comportant au moins deux encoches 42 latérales opposées transversalement, comme cela est illustré aux figures 2 et 5. Chaque encoche 42 est formée par une rainure longitudinale dont le fond 44 forme un méplat. Chaque encoche 42 est délimitée verticalement par une face 46 horizontale inférieure et par une face 48 horizontale supérieure.To allow the maintenance and indexing of the injector 28, the lower injection section 30 comprises an upper fixing portion comprising at least two lateral notches 42 opposite transversely, as illustrated in FIGS. figures 2 and 5 . Each notch 42 is formed by a longitudinal groove, the bottom 44 of which forms a flat. Each notch 42 is delimited vertically by a lower horizontal face 46 and by an upper horizontal face 48.

Une bride 50 de fixation est destinée à coopérer avec ces encoches 42 pour maintenir et indexer l'injecteur 28. Une telle bride 50 est notamment visible aux figures 6 et 7. La bride 50 comporte une première partie avant en forme de fourchette 52 rigide. La fourchette 52 présente une section horizontale en forme de "U" dont l'ouverture est dirigée longitudinalement vers l'avant. La fourchette 52 comporte ainsi deux bras 54 longitudinaux dont les extrémités arrière sont liées par un demi-anneau 56.A fixing flange 50 is intended to cooperate with these notches 42 in order to hold and index the injector 28. Such a flange 50 is in particular visible to figures 6 and 7 . The flange 50 has a first front part in the form of a rigid fork 52. The fork 52 has a horizontal section in the shape of a "U" whose opening is directed longitudinally forward. The fork 52 thus comprises two longitudinal arms 54, the rear ends of which are linked by a half-ring 56.

Les deux bras 54 longitudinaux de la fourchette 52 sont écartés transversalement d'une distance supérieure au plus grand diamètre "D1" du tronçon 30 inférieur de l'injecteur 28 de manière que ledit tronçon 30 inférieur soit susceptible de coulisser axialement entre les bras 54.The two longitudinal arms 54 of the fork 52 are spaced transversely by a distance greater than the largest diameter "D1" of the lower section 30 of the injector 28 so that said lower section 30 is able to slide axially between the arms 54.

La bride 50 comporte aussi une partie 58 arrière de fixation qui présente une forme de manche longitudinal qui s'étend vers l'arrière depuis le demi-anneau 56. Cette partie 58 de fixation est destinée à être fixée à la culasse 10 par l'intermédiaire d'une unique vis 60 d'axe vertical qui est illustrée aux figures 3 et 4. A cet effet, la partie 58 de fixation est traversée par un orifice 62 de passage de la vis 60.The flange 50 also comprises a rear fixing part 58 which has the shape of a longitudinal sleeve which extends rearwardly from the half-ring 56. This fixing part 58 is intended to be fixed to the cylinder head 10 by means of a single screw 60 with a vertical axis which is illustrated in figures 3 and 4 . For this purpose, the fixing part 58 is crossed by an orifice 62 for the passage of the screw 60.

La bride 50 est agencée sur la face 22 supérieure du support 18 de manière que la fourchette 52 soit en coïncidence avec le puits 36. Un perçage 63 est réalisé à travers le support 18 et dans la culasse 10 pour recevoir la vis 60 de fixation de la bride 50.The flange 50 is arranged on the upper face 22 of the support 18 so that the fork 52 is in coincidence with the well 36. A bore 63 is made through the support 18 and in the cylinder head 10 to receive the screw 60 for fixing the cylinder head. the flange 50.

Pour permettre le maintien en position de l'injecteur 28 dans le puits 36 après que la bride 50 ait été positionnée sur le support 18, deux éléments 66 de maintien sont montés coulissants transversalement chacun dans un bras 54 associé. Chaque élément 66 de maintien est destiné à être inséré dans une encoche 42 latérale associée pour maintenir l'injecteur 28 verticalement en position contre son siège 40, comme cela est représenté à la figure 2.To allow the injector 28 to be maintained in position in the well 36 after the flange 50 has been positioned on the support 18, two retaining elements 66 are each mounted to slide transversely in an associated arm 54. Each retaining element 66 is intended to be inserted into an associated lateral notch 42 to maintain the injector 28 vertically in position against its seat 40, as shown in figure 2 .

Les deux éléments 66 de maintien sont identiques par symétrie par rapport à un plan vertical longitudinal médian de la bride 50. Chaque élément 66 de maintien comporte une extrémité 65 transversale interne libre qui est tournée vers l'injecteur 28.The two retaining elements 66 are identical by symmetry with respect to a median longitudinal vertical plane of the flange 50. Each retaining element 66 comprises a free internal transverse end 65 which is turned towards the injector 28.

Pour le montage de chaque élément 66 de maintien dans le bras 54 associé, chaque bras 54 présente dans sa face 67 interne tournée vers le bras 54 opposé, un logement 68. Pour permettre le montage des éléments 66 de maintien, chaque logement 68 traverse transversalement le bras 54 pour déboucher dans la face 70 externe du bras. Le logement 68 présente ici une forme cylindrique d'axe transversal.For mounting each holding element 66 in the associated arm 54, each arm 54 has in its internal face 67 turned towards the opposite arm 54, a housing 68. To allow the mounting of the holding elements 66, each housing 68 crosses transversely. the arm 54 to open into the outer face 70 of the arm. The housing 68 here has a cylindrical shape with a transverse axis.

Les deux éléments 66 de maintien sont montés coulissant transversalement entre une position écartée (non représentée) dans laquelle ils sont écartés d'une distance supérieure au plus grand diamètre "D1" du tronçon d'injection et une position rapprochée, illustrée aux figures 2, 6, 7 et 8, vers laquelle ils sont rappelés élastiquement et dans laquelle chaque élément 66 de maintien est susceptible d'être emboîté transversalement dans l'encoche 42 latérale associée.The two retaining elements 66 are mounted to slide transversely between a separated position (not shown) in which they are separated by a distance greater than the largest diameter "D1" of the injection section and a close position, illustrated in figures 2 , 6 , 7 and 8 , to which they are elastically recalled and in which each retaining element 66 is capable of being fitted transversely in the associated lateral notch 42.

Ainsi, en position écartée, chaque élément 66 de maintien est ici rétracté transversalement au moins en partie à l'intérieur du logement 68, tandis qu'en position rapprochée, les éléments 66 de maintien s'étendent l'un vers l'autre en saillie transversalement par rapport au bras 54 associé.Thus, in the separated position, each holding element 66 is here retracted transversely at least in part inside the housing 68, while in the close position, the holding elements 66 extend towards each other in projection transversely with respect to the associated arm 54.

Pour éviter que les éléments 66 de maintien ne tombent de leur logement 68, chaque logement 68 présente, au niveau de son embouchure interne qui débouche dans la face 67 interne du bras, un rebord 72 qui diminue la section du logement 68 cylindrique. Comme représenté à la figure 8, une face transversale externe de ce rebord 72 est destinée à arrêter l'élément 66 de maintien associé en position rapprochée par coopération avec une face 74 de butée associée de l'élément 66 de maintien.To prevent the retaining elements 66 from falling from their housing 68, each housing 68 has, at its internal mouth which opens into the internal face 67 of the arm, a flange 72 which reduces the section of the cylindrical housing 68. As shown in the figure 8 , an external transverse face of this rim 72 is intended to stop the associated retaining element 66 in the close position by cooperation with an associated abutment face 74 of the retaining element 66.

Lors de leur montage les éléments 66 de maintien sont insérés dans le logement 68 associé par son embouchure externe qui débouche dans la face 70 externe du bras 54. Pour maintenir l'élément 66 de maintien dans son logement 68, une vis 76 de fermeture ferme l'embouchure externe du logement 68.During their assembly, the retaining elements 66 are inserted into the associated housing 68 by its external mouth which opens into the outer face 70 of the arm 54. To maintain the retaining element 66 in its housing 68, a closing screw 76 closes the outer mouth of the housing 68.

En outre, le rappel élastique des éléments 66 de maintien vers leur position rapprochée est ici réalisé par interposition d'un organe élastique dans le logement 68 entre la vis 76 de fermeture et l'élément 66 de maintien associé. L'organe élastique est ici formé par un ressort 80 monté précontraint en compression. L'effort de précontrainte peut avantageusement être réglé en agissant sur la vis 76 de fermeture.In addition, the elastic return of the retaining elements 66 towards their close position is here achieved by interposing an elastic member in the housing 68 between the closing screw 76 and the associated retaining element 66. The elastic member is here formed by a spring 80 mounted pre-stressed in compression. The prestressing force can advantageously be adjusted by acting on the closing screw 76.

L'extrémité 65 interne de chaque élément 66 de maintien est biseautée de manière à former une rampe 82 dirigée verticalement vers le haut. Cette rampe 82 permet de commander automatiquement le coulissement des éléments 66 de maintien vers leur position écartée par contact avec l'injecteur 28 lors de l'insertion verticale vers le bas du tronçon 30 d'injection entre les bras 54. Les éléments 66 de maintien fonctionnent ainsi à la manière d'un pêne demi-tour de porte battante.The internal end 65 of each retaining element 66 is bevelled so as to form a ramp 82 directed vertically upwards. This ramp 82 automatically controls the sliding of the retaining elements 66 towards their separated position by contact with the injector 28 during the vertical insertion downwards of the injection section 30 between the arms 54. The retaining elements 66 thus operate in the manner of a door latch bolt. swinging.

Chaque élément 66 de maintien et le logement 68 associé présentent globalement une forme cylindrique de révolution. Pour garantir que la rampe 82 soit toujours orientée vers le haut, il est prévu des moyens de blocage en rotation de l'élément 66 de maintien par rapport à son logement 68. Dans le mode de réalisation représenté aux figures, l'élément 66 de maintien est muni d'une rainure 83 transversale dans sa face cylindrique, ici tourné vers le bas, comme illustré à la figure 9. Une goupille 84 est agencée de manière à déboucher verticalement en saillie par rapport à une face cylindrique intérieure du logement 68 afin de pénétrer dans la rainure 83 pour bloquer l'élément 66 de maintien en rotation lors de son coulissement.Each retaining element 66 and the associated housing 68 generally have a cylindrical shape of revolution. To ensure that the ramp 82 is always oriented upwards, there is provided means for locking the element 66 in rotation relative to its housing 68. In the embodiment shown in the figures, the element 66 of holding is provided with a transverse groove 83 in its cylindrical face, here facing downwards, as illustrated in figure 9 . A pin 84 is arranged so as to emerge vertically protruding from an inner cylindrical face of the housing 68 in order to penetrate into the groove 83 to block the element 66 for maintaining it in rotation during its sliding.

Par ailleurs, pour permettre l'indexage angulaire de l'injecteur 28 par rapport à la culasse 10, chaque élément 66 de maintien présente une face 86 d'extrémité interne qui s'étend longitudinalement, ici réduite à la tailler d'une arête longitudinale, qui est destinée à être appuyée sur toute sa longueur contre le fond de l'encoche 42 de l'injecteur.Moreover, to allow the angular indexing of the injector 28 relative to the cylinder head 10, each retaining element 66 has an internal end face 86 which extends longitudinally, here reduced to the cut of a longitudinal edge. , which is intended to be pressed over its entire length against the bottom of the notch 42 of the injector.

Durant l'insertion de l'injecteur 28 dans la culasse 10, la bride 50 est destinée à être maintenue en position par la vis 60 non serrée permettant ainsi un pivotement limité de la bride 50 sur la culasse 10. Ceci permet de faciliter l'insertion de l'injecteur 28 dans la bride 50 et rattraper un éventuel défaut de positionnement de la bride, notamment un défaut de perpendicularité.During the insertion of the injector 28 into the cylinder head 10, the flange 50 is intended to be held in position by the loose screw 60 thus allowing limited pivoting of the flange 50 on the cylinder head 10. This makes it possible to facilitate the insertion of the injector 28 into the flange 50 and make up for any faulty positioning of the flange, in particular a fault in perpendicularity.

Ce pivotement limité de la bride 50 est avantageusement guidé par une liaison de type rotule avec la vis 60 de fixation. Pour ce faire, le pourtour supérieur de l'orifice 62 de passage présente avantageusement une forme de cuvette 88 concave tandis qu'une rondelle 90 de compensation présentant une face inférieure de forme convexe complémentaire. La rondelle 90 est interposée entre la tête de la vis 60 de fixation et la bride 50 de manière que sa face convexe soit reçue dans la cuvette 88.This limited pivoting of the flange 50 is advantageously guided by a ball joint type connection with the fixing screw 60. To do this, the upper periphery of the passage orifice 62 advantageously has the shape of a concave bowl 88. while a compensation washer 90 having a lower face of complementary convex shape. The washer 90 is interposed between the head of the fixing screw 60 and the flange 50 so that its convex face is received in the cup 88.

Cependant, du fait de ce pivotement limité, la fourchette 52 de la bride 50 est susceptible de descendre au-dessous du niveau des encoches 42 de l'injecteur 28 après son insertion dans le puits 36. Pour garantir que la fourchette 52 occupera sa position verticale permettant l'emboîtement dans les encoches 42 malgré ce mouvement limité de la bride 50, un organe 92 de rappel élastique est interposé entre la culasse 10 et la fourchette 52. Il s'agit ici d'un ressort cylindrique qui est agencé autour du puits 36 et qui présente un diamètre supérieur à celui du tronçon inférieur de l'injecteur 28. Ce ressort est par exemple inséré dans un lamage 94 qui est réalisé autour du puits 36 et qui débouche dans la face supérieure du support 18. Ce lamage 94 permet de maintenir le ressort 92 en position. L'organe 92 de rappel élastique permet aussi de prévenir l'affaissement de la bride 50 lors de l'insertion de l'injecteur 28.However, due to this limited pivoting, the fork 52 of the flange 50 is liable to drop below the level of the notches 42 of the injector 28 after it is inserted into the well 36. To ensure that the fork 52 will occupy its position vertical allowing the fitting into the notches 42 despite this limited movement of the flange 50, an elastic return member 92 is interposed between the yoke 10 and the fork 52. This is a cylindrical spring which is arranged around the well 36 and which has a diameter greater than that of the lower section of the injector 28. This spring is for example inserted into a counterbore 94 which is produced around the well 36 and which opens into the upper face of the support 18. This counterbore 94 keeps the spring 92 in position. The elastic return member 92 also makes it possible to prevent sagging of the flange 50 during the insertion of the injector 28.

Lors du montage de la bride 50 de fixation, les éléments 66 de maintien sont tout d'abord insérés dans leur logement 68 associé par l'embouchure externe. Puis, le ressort 80 est inséré dans le logement 68 de la même manière. Enfin, les vis 76 de fermeture sont vissées pour boucher l'embouchure externe du logement, tout en permettant de précontraindre les ressorts 80 de manière à rappeler élastiquement les éléments 66 de maintien vers leur position rapprochée.When mounting the fixing flange 50, the retaining elements 66 are first of all inserted into their associated housing 68 through the external mouth. Then, the spring 80 is inserted into the housing 68 in the same way. Finally, the closing screws 76 are screwed to plug the external mouth of the housing, while allowing the springs 80 to be pre-stressed so as to elastically return the retaining elements 66 to their close position.

On décrit maintenant un procédé de fixation de l'injecteur 28 sur la culasse 10. Préalablement à la fixation de l'injecteur 28, le support 18 et les composants mobiles, notamment les arbres 16 à cames sont agencés sur la face 14 supérieure de la culasse 10.A method of fixing the injector 28 to the cylinder head 10 will now be described. Prior to the fixing of the injector 28, the support 18 and the moving components, in particular the camshafts 16, are arranged on the upper face 14 of the cylinder head. cylinder head 10.

Lors d'une première étape "E1" de positionnement, l'organe 92 de rappel élastique est inséré dans le lamage 94. Puis, la bride 50 est positionnée longitudinalement entre les deux arbres 16 à cames de manière que la fourchette 52 soit en coïncidence avec le puits 36 et de manière que l'orifice 62 de passage soit en coïncidence avec le perçage 63. L'organe 92 de rappel élastique est ainsi interposé entre la fourchette 52 et la culasse 10.During a first positioning step "E1", the elastic return member 92 is inserted into the counterbore 94. Then, the flange 50 is positioned longitudinally between the two camshafts 16 so that the fork 52 is in coincidence. with the well 36 and so that the passage orifice 62 is in coincidence with the bore 63. The elastic return member 92 is thus interposed between the fork 52 and the cylinder head 10.

Puis, lors d'une deuxième étape "E2" de maintien en position, la vis 60 de fixation est insérée dans l'orifice 62 de passage et vissé dans le perçage 63, sans toutefois être serrée de manière à permettre le pivotement limité de la bride 50 par rapport à la culasse 10. Ceci permettra par la suite de faciliter l'insertion de l'injecteur 28 dans le puits 36.Then, during a second step "E2" for maintaining in position, the fixing screw 60 is inserted into the passage opening 62 and screwed into the bore 63, without however being tightened so as to allow the limited pivoting of the flange 50 relative to the cylinder head 10. This will subsequently facilitate the insertion of the injector 28 into the well 36.

Après le positionnement de la bride 50, une troisième étape "E3" de montage du couvre-culasse 24 est déclenchée. Durant cette étape, le couvre-culasse 24 est positionné et fixé à la culasse 10 en recouvrant la bride 50 ainsi que les arbres 16 à cames.After the positioning of the flange 50, a third step “E3” for mounting the cylinder head cover 24 is initiated. During this step, the cylinder head cover 24 is positioned and fixed to the cylinder head 10 by covering the flange 50 as well as the camshafts 16.

Ensuite, une quatrième étape "E4" d'insertion de l'injecteur 28 est réalisée. Au cours de cette étape, le tronçon 30 inférieur de l'injecteur 28 est inséré verticalement vers le bas dans l'orifice 41 d'insertion du couvre-culasse 24. Le tronçon 30 inférieur passe ensuite entre les bras 54 de la fourchette 52 en appuyant sur la rampe 84 des éléments 66 de maintien. Ceci provoque automatiquement le coulissement des éléments 66 de maintien vers leur position écartée à l'encontre de l'effort de rappel élastique permettant de poursuivre l'insertion de l'injecteur 28 entre les bras 54 de la fourchette 52.Then, a fourth step “E4” for inserting the injector 28 is carried out. During this step, the lower section 30 of the injector 28 is inserted vertically downwards into the hole 41 for inserting the cylinder head cover 24. The lower section 30 then passes between the arms 54 of the fork 52 in pressing the ramp 84 of the retaining elements 66. This automatically causes the sliding of the holding elements 66 towards their separated position against the elastic return force allowing the insertion of the injector 28 between the arms 54 of the fork 52 to continue.

L'insertion se poursuit jusqu'à ce que l'injecteur 28 soit en appui sur son siège 40. La fourchette 52 est simultanément repoussée vers le haut jusqu'à sa position de fixation par le ressort 92. Les encoches 42 latérales de l'injecteur 28 sont alors au niveau des éléments 66 de maintien et les éléments 66 de maintien sont alors libres d'être emboîtés élastiquement dans les encoches 42 latérales.The insertion continues until the injector 28 is resting on its seat 40. The fork 52 is simultaneously pushed upwards to its fixing position by the spring 92. The side notches 42 of the injector 28 are then at the level of the retaining elements 66 and the retaining elements 66 are then free to be fitted elastically in the lateral notches 42.

Enfin, lors d'une cinquième étape "E5" de fixation rigide, la vis 60 de fixation est serrée pour fixer rigidement la bride 50 sur la culasse 10. A cet effet, et comme représenté à la figure 3, un passage 96 d'accès est ménagé dans le couvre-culasse 24 pour insérer un outil tel qu'une clé dynamométrique.Finally, during a fifth step "E5" of rigid fixing, the fixing screw 60 is tightened to rigidly fix the flange 50 on the cylinder head 10. For this purpose, and as shown in figure 3 , an access passage 96 is provided in the cylinder head cover 24 for inserting a tool such as a torque wrench.

Après serrage de la vis 60 de fixation, le passage 96 d'accès est rebouché avec un bouchon 98 de manière étanche lors d'une sixième étape "E6" de bouchage.After tightening the fixing screw 60, the access passage 96 is plugged with a plug 98 in a sealed manner during a sixth plugging step “E6”.

Chaque élément 66 de maintien comporte une face 100 horizontale inférieure de butée qui bloque le coulissement vertical vers le haut de l'injecteur 28 par coopération avec la face 46 inférieure de l'encoche 42 latérale pour maintenir l'injecteur 28 en appui contre son siège 40. L'injecteur 28 ne peut donc plus être retiré verticalement.Each retaining element 66 comprises a lower horizontal stop face 100 which blocks the upward vertical sliding of the injector 28 by cooperation with the lower face 46 of the lateral notch 42 to keep the injector 28 resting against its seat. 40. The injector 28 can therefore no longer be withdrawn vertically.

En outre, la face 86 plane en bout d'élément 66 de maintien permet d'empêcher la rotation de l'injecteur 28 autour de son axe "A".In addition, the planar face 86 at the end of the retaining element 66 makes it possible to prevent the rotation of the injector 28 about its axis "A".

Pour le démontage de l'injecteur 28, la vis 60 de fixation est totalement dévissée en passant un outil par le passage 96 d'accès du couvre-culasse 24. Puis le couvre-culasse 24 est lui-même démonté. L'ensemble formé par le couvre-culasse 24, la bride 50 et l'injecteur 28 est alors retiré de la culasse 10. Un opérateur peut alors accéder à la bride 50 permettant ainsi de la retirer par coulissement longitudinal par rapport à l'injecteur 28.To remove the injector 28, the fixing screw 60 is completely unscrewed by passing a tool through the passage 96 for accessing the cylinder head cover 24. Then the cylinder head cover 24 is itself removed. The assembly formed by the cylinder head cover 24, the flange 50 and the injector 28 is then withdrawn from the cylinder head 10. An operator can then access the flange 50 thus making it possible to remove it by sliding longitudinally relative to the injector. 28.

L'injecteur 28 peut alors être extrait de l'orifice 41 d'insertion du couvre-culasse 24 par coulissement vertical vers le haut.The injector 28 can then be extracted from the orifice 41 for inserting the cylinder head cover 24 by vertical sliding upwards.

L'agencement réalisé selon l'état de la technique permet ainsi de positionner la bride 50 sur la culasse 10 avant que l'injecteur 28 ne soit inséré dans le puits 36. Ceci permet notamment de fixer facilement l'injecteur 28 lorsque la bride 50 n'est pas accessible.The arrangement made according to the state of the art thus makes it possible to position the flange 50 on the cylinder head 10 before the injector 28 is inserted into the well 36. This allows in particular to easily fix the injector 28 when the flange 50 is not accessible.

Cela permet aussi de simplifier le montage des injecteurs 28 même lorsque les brides 50 sont encore accessibles en éliminant l'étape d'assemblage de la bride avec l'injecteur préalablement au positionnement simultané de la bride et de l'injecteur sur la culasse.This also makes it possible to simplify the assembly of the injectors 28 even when the flanges 50 are still accessible by eliminating the step of assembling the flange with the injector prior to the simultaneous positioning of the flange and the injector on the cylinder head.

Claims (10)

  1. Arrangement for mounting an injector (28) on a cylinder head (10) of the combustion engine of a motor vehicle, the injector (28) having a vertical main axis (A) and comprising a lower end injection portion (30) which is intended to be inserted into a well (36) in the cylinder head (10), the injection portion (30) comprising at least two transversely opposed lateral notches (42), the arrangement comprising a fixing clamp (50) which comprises:
    - a fixing part (58) which is intended to be fixed to the cylinder head (10),
    - two retaining elements (66) in the shape of cylinders of revolution which are intended to be inserted in the lateral notches (42) so as to hold the injector (28) vertically in the well (36) ;
    - a rigid fork (52) which comprises two transversely separated longitudinal arms (54) between which the injection portion (30) is able to slide axially
    wherein the two retaining elements (66) are mounted with the ability to move transversely between a parted position in which they are parted by a distance greater than the largest diameter (D1) of the injection portion (30) and a closer-together position towards which they are elastically returned and in which each retaining element (66) is capable of being fitted transversely into the associated lateral notch (42),
    characterized in that each retaining element (66) is mounted with the ability to slide transversely in an associated arm (54) and has a face (82) in the form of a ramp facing axially upwards so that as it is inserted vertical into the well (36), the injection portion (30) between the arms (54) presses on the ramps (82) of the retaining elements (66) in order to make them slide towards their parted position.
  2. Arrangement according to Claim 1, characterized in that the retaining elements (66) have a lower abutment face (100) which blocks the upwards vertical sliding of the injector (28) with respect to the clamp (50) when the retaining elements (66) are fitted into the lateral notches (42).
  3. Arrangement according to either one of Claims 1 and 2, characterized in that each retaining element (66) comprises a planar free-end face (86) which extends longitudinally to block the rotation of the injector (28) by contact with a flat bottom (44) of the notch (42) .
  4. Arrangement according to any one of the preceding claims, characterized in that the fixing part (58) of the clamp (50) is capable of being fixed to the cylinder head (10) by means of a screw (60) of vertical axis.
  5. Arrangement according to the preceding claim, characterized in that a spherical levelling washer (90) is interposed between a head of the screw (60) and the clamp (50) in order to allow the clamp (50) to pivot with respect to the cylinder head (10) when the screw (60) is not tightened, notably in order to allow a perpendicularity defect to be corrected.
  6. Arrangement according to any one of the preceding claims, characterized in that an elastic return member (92) working in compression is interposed between the fork (52) of the clamp (50) and the cylinder head (10) so as to allow the clamp (50) to be held in position on the cylinder head (10) with limited movement before the clamp (50) is fixed to the cylinder head (10).
  7. Arrangement according to any one of the preceding claims, characterized in that a cylinder head cover (24) is arranged over the cylinder head (10), the clamp (50) being interposed between the cylinder head (10) and the cylinder head cover (24), the cylinder head cover (24) comprising an orifice (41) for the insertion of the injector which orifice is arranged to coincide with the well (36).
  8. Arrangement according to the preceding claim, characterized in that the cylinder head cover (24) comprises a passage (96) providing access to the fixing part (58) of the clamp (50).
  9. Arrangement according to any one of the preceding claims, characterized in that the clamp (50) is fixed to the cylinder head via a support (18) for a cam shaft (16), which support is itself fixed directly to the cylinder head (10).
  10. Method for fixing an injector (28) to a cylinder head (10) employing the arrangement according to Claim 9 taken in combination with Claims 4 to 6, characterized in that it comprises the following successive steps:
    - a first step (E1) of the positioning the clamp (50) on the cylinder head (10) with the interposition of the elastic return member (92) between the fork (52) and the cylinder head (10);
    - a second step (E2) of holding the clamp (50) in position by means of a screw (60) that is not yet tightened, so as to maintain limited pivoting of the clamp (50) with respect to the cylinder head (10);
    - a third step (E3) of mounting of the cylinder head cover (24) on the cylinder head (10);
    - a fourth step (E4) of inserting the injection portion (30) into the insertion orifice (41) in the cylinder head cover (24) and into the well (36) in the cylinder head (10) until the retaining elements (66) are fitted elastically into the lateral notches (42);
    - a fifth step (E5) of rigidly fixing the clamp (50) to the cylinder head (10) and which consists in tightening the screw (60) by passing a suitable tool through the access passage (96);
    - a sixth step (E6) of plugging, during which the access passage (96) is re-sealed using a plug (98) .
EP16187166.0A 2015-09-17 2016-09-05 Arrangement for mounting an injector on a yoke by resilient fitting in a fixing flange Active EP3144518B1 (en)

Applications Claiming Priority (1)

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FR1558738A FR3041386B1 (en) 2015-09-17 2015-09-17 "ARRANGEMENT FOR MOUNTING AN INJECTOR ON A CYLINDER HEAD BY ELASTIC SOCKET IN A FIXING FLANGE"

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EP3144518A1 EP3144518A1 (en) 2017-03-22
EP3144518B1 true EP3144518B1 (en) 2020-11-04

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GB2621889A (en) * 2022-08-26 2024-02-28 Borgwarner Luxembourg Operations Fuel pump assembly

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FR3041386A1 (en) 2017-03-24
FR3041386B1 (en) 2020-05-01
EP3144518A1 (en) 2017-03-22

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