EP3215732B1 - Anti-rotation device of a fuel lance - Google Patents

Anti-rotation device of a fuel lance Download PDF

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Publication number
EP3215732B1
EP3215732B1 EP15804329.9A EP15804329A EP3215732B1 EP 3215732 B1 EP3215732 B1 EP 3215732B1 EP 15804329 A EP15804329 A EP 15804329A EP 3215732 B1 EP3215732 B1 EP 3215732B1
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EP
European Patent Office
Prior art keywords
lance
bore
tubular member
fuel
rotation device
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
EP15804329.9A
Other languages
German (de)
French (fr)
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EP3215732A1 (en
Inventor
Emmanuel Autret
Fabrizio A. Bonfigli
Julien NOURISSON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi International Operations Luxembourg SARL
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Delphi International Operations Luxembourg SARL
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Publication of EP3215732A1 publication Critical patent/EP3215732A1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and 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
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws

Definitions

  • the present invention relates to an anti-rotation device used in a fuel lance supplying a fuel injector at high pressure.
  • a fuel pump supplies high pressure fuel to each engine cylinder by means of a dedicated fuel injector.
  • the fuel injector is mounted in a bore in a cylinder head and a fuel lance is used to provide a fluid connection between the injector and the supply conduit from the fuel pump.
  • a fuel lance 10 comprises a tubular member 22 having a first end 46 adapted to cooperate with the seat 16 of an injector 12, and a second end 48 which is formed to define a frustoconical seat 24.
  • a fixing nut 26 is located partially within one end of a bore 20, the fixing nut 26 having an inner end region 28 adapted to cooperate with the seat 24.
  • the fixing nut 26 comprises an external threaded region 30.
  • the threading 30 is arranged to cooperate with screw threads formed in the end 48 of the bore 20.
  • the inner end 28 of the fastener nut 26 cooperates with the seat 24 of the tubular member 22 by applying a compressive force against the tubular member 22 to form a joint. sealing both between the tubular member 22 and the seat 16 of the injector 12 and between the nut 26 and the tubular member 22.
  • the tubular member 22 and the fixing nut 26 each comprise axially extending passages which together define a flow path.
  • the fuel is able to flow through the lance to fuel 10 to the supply passage 18 of the injector 12 from a high pressure fuel pipe 34 fixed to the fastening nut 26 via a standard attachment tube 36.
  • the bore of the fixing nut 26 extends axially and comprises a larger diameter region which receives a slot filter element 38 arranged to filter undesirable particles from the fuel flow to the injector 12 .
  • the yoke 14 has a passage 42 which communicates with the bore 20, the passage 42 allowing the low pressure fuel to flow from the injector 12 through the bore 20 to a low pressure fuel tank (not described ).
  • the fixing nut 26 comprises a proximal recess of the threaded region 30 which positions an annular sealing element 32 arranged to form a fluid-tight seal between the fixing nut 26 and the wall of the cylinder head 14 defining the bore. 20.
  • Another type of assembly is known to US 6,199,539 B1 .
  • a problem arises about the device of the high-pressure fuel supply is that the seal between the fuel lance and the injection nozzle requires the tightening of a fixing screw in the cylinder head and the transfer of the load the screw towards the fuel lance. This mechanism also causes the rotation of parts and the generation of unwanted particles in the form of debris, which could lead to fuel contamination and component wear.
  • the invention consists of an anti-rotation device for the fuel lance to prevent its rotation inside the cylinder head and thus better transmit the desired load.
  • the present invention aims to solve the problems mentioned above by proposing a simple and easy assembly solution.
  • the invention proposes an anti-rotation device for a fuel lance.
  • the lance is adapted to be arranged in a bore extending through a cylinder head from an inlet port to a well for receiving a fuel injector.
  • the lance is adapted to allow high-pressure fuel to flow from an inlet mouth of the lance to the outlet mouth of the lance cooperating with the inlet mouth of the fuel injector.
  • the fuel lance includes a nut intended to be screwed into an inlet port of the bore and a tubular member compressed between said nut and the injector.
  • the lance further comprises anti-rotation device adapted to prohibit the rotation of the tubular member when the nut is screwed.
  • the anti-rotation device is an elastic element deforming from the beginning of the rotation of the nut so as to lock between the tubular member and the inner wall of the bore and thus to prohibit the rotation of the tubular member.
  • the elastic element is able to be arranged between the lance and the bore.
  • the elastic element is a torsion spring wound in a cylindrical helix around the tubular member.
  • the torsion spring comprises a lug at one end, the lug anchored in a groove formed in the proximal bore of the inlet mouth of the bore.
  • a second embodiment is characterized in that the elastic element is a double torsion spring wound in a cylindrical helix around the tubular member.
  • the double torsion spring comprises two lugs respectively at each end, the two lugs anchored in the groove of the bore.
  • the fuel lance further comprises anti-rotation device as described in the various embodiments.
  • An internal combustion engine further comprises an injector fed by the fuel lance as previously described in the various embodiments.
  • the fuel lance 100 is arranged in a long bore 102 drilled in a high engine 104 also called cylinder head.
  • the fuel lance 100 extends from an inlet port 116 to a well 108 provided to receive a fuel injector 110.
  • the fuel lance 100 comprises a tubular member 118 arranged in the long bore 102, a fastener nut 112 cooperating with the tubular member 118 and an anti-rotation device 120 mounted on the tubular member.
  • the tubular member 118 extends along the long bore 102 from the inlet 116 of the yoke 104 to an outlet 122 of the yoke 104 opening into the well 108.
  • the tubular member 118 comprises an inlet mouth 106 and an outlet mouth 124.
  • the inlet mouth 106 has an end 142 in male spherical shape whose apex is sliced.
  • the outlet mouth 124 has a male spherical surface.
  • the outlet mouth 124 cooperates with an inlet mouth 126 of the injector 110 having a female conical surface.
  • the tubular member 118 is cylindrical in shape.
  • the tubular member 118 comprises a groove 128 proximal to the inlet port 116 of the breech 104 to receive an anti-rotation device 120.
  • the fixing nut 112 is mounted on the inlet mouth 106 of the tubular member 118 proximal to the inlet port 116 of the cylinder head 104.
  • the nut 112 is located partially outside the orifice 116.
  • the fixing nut 112 comprises a recess for receiving a seal 130.
  • the seal 130 is arranged to form a fuel seal between the fixing nut 112 and the surface of the cylinder head 104 defining the long bore 102.
  • the seal 130 is distal from the outlet mouth 124 of the lance 100 in contact with the injector 110. As illustrated in FIG.
  • the fixing nut 112 comprises an externally threaded region 138 which is arranged to cooperate with the screw threads formed in the inlet orifice 116 of the cylinder head 104.
  • the nut 112 internally comprises a bore, one end 115 of which distal cone shape of the tubular member 118 and a female cone-shaped end 140.
  • the inner end 140 of the fixing nut 112 facing the inside of the long bore 102 cooperates with the inlet mouth 106 of the tubular member 118.
  • the cone of the inner end 140 is in axial compression against the end 142.
  • the anti-rotation device 120 is an elastic element that deforms from the beginning of the rotation of the fixing nut 112.
  • the elastic element is arranged between the lance 100 and the bore 102.
  • the anti-rotation device 120 is mounted around the groove 128 of the tubular member 118 at a distance proximal to the inlet mouth 106.
  • the anti-rotation device 120 is in contact with a groove 132 formed in the bore 102 of the cylinder head 104.
  • the anti-rotation device 120 is a torsion spring wound in cylindrical helix around the tubular member 118.
  • the spring 120 is in contact with both the groove 128 on an outer surface of the tubular member 118 and the groove 132 in the tubular member 118. Bore 102.
  • the torsion spring 120 includes a lug 134 at one end.
  • the pin 134 is anchored in the groove 132 of the bore 102, which means that the pin is inserted into the groove and that it can rotate in the groove about the main axis A.
  • the spring 120 has two positions, a first position released when the spring 120 is at rest, a second position constrained when applying a tightening torque.
  • the winding direction of the torsion spring 120 is on the right that is to say that the helix rises to the right.
  • the following data is given by way of example to illustrate the first embodiment.
  • the length of the fuel lance is substantially equal to 100 mm.
  • the length of the fixing nut is substantially equal to 55 mm with a diameter substantially equal to 22 mm.
  • the diameter of the bore 102 is substantially equal to 12 mm.
  • the spring is of length substantially equal to 12 mm with a number of turns of 5.
  • the winding to the right of the spring 120 serves to screw the fuel lance 100.
  • the anti-rotation device 120 is a double spring wound on the tubular element 118.
  • the torsion spring 120 wound in a cylindrical helix is provided with two lugs 134, 136 respectively located at the two ends of the spring 120.
  • first lug 134 is anchored in the groove 132 of the bore 102 and the second lug 136 is anchored in the groove 132 of the bore 102 distal of the first lug 134.
  • the two lugs 134, 136 are anchored which means that they are inserted into the groove and that they can rotate about the main axis A.
  • the spring 120 has two positions, a first position released when the spring 120 is at rest, a second position constrained when applying a torque of tightening or loosening.
  • the spring 120 has two opposite windings.
  • the two windings may have either an identical number of turns or a different number of turns.
  • the angular stiffnesses of the two windings may be identical or different.
  • the direction of one of the two windings of the spring 120 is on the right for the screwing of the fuel lance 100 and the direction of the other winding is on the left for the unscrewing of the fuel lance 100.
  • the following data is given in FIG. as an example to illustrate the second embodiment.
  • the length of the fuel lance is substantially equal to 100 mm.
  • the length of the fixing nut is substantially equal to 55 mm with a diameter substantially equal to 22 mm.
  • the diameter of the bore 102 is substantially equal to 12 mm.
  • the double spring 120 has a length substantially equal to 23 mm with a total number of turns of 10 turns, 5 turns in a winding direction of the spring 120 and 5 turns in the other direction of winding.
  • the winding on the right of the double spring 120 serves to screw the fuel lance 100 and the winding on the left serves to unscrew the fuel lance 100. If the screwing of the fuel lance 100 is chosen in the opposite direction of the clockwise then the thread is on the left so the double torsion spring 120 has a first winding direction to the left of the double spring 120 for screwing and a second winding direction to the right of the double spring 120 for the unscrewing of the fuel lance 100.
  • the torsion spring 120 rotates about its main axis A in the screwing direction until the contact between the pin 134 and the groove 132 of the bore 102 in the cylinder head 104.
  • the spring 120 is tightened around the tubular element 118 during the rotation of the nut 112 by compressing until blocking the rotation of the tubular element 118.
  • the spring 120 remains tight on the tubular member 118 and the lug 134 remains in contact with the groove 132.
  • the double torsion spring 120 initiates the rotation about its main axis A until the contact between the pin 134 and the groove 132 of the bore 102 in the cylinder head 104.
  • the spring 120 is tightened around the tubular element 118 with one of the turns of the coil during the rotation of the nut 112 by compressing itself and the spring 120 blocks the rotation of the tubular element 118. stopping of the screwing takes place, the spring 120 remains tight on the tubular element 118 and the lug 134 remains in contact with the groove 132.
  • the torsion spring 120 loosens around the tubular member 118 for the winding on the right while the winding on the left will gradually tighten on the tubular member 118 through the contact between the pin 136 and the groove 132 of the bore 102 in the cylinder head 104 until to block the rotation of the tubular member 118.
  • the nut 112 can be loosened without rotation of the tubular member 118 and the generation of undesirable particles will be avoided also loosening.
  • the elastic member 120 is mounted by threading it around the tubular member 118 through the end 106 to the groove 128 of the tubular member 118 proximal to the end 106 receiving the tubular member 118. Fixing nut 112. The elastic element 120 is mounted tightly on the tubular element 118. Then the fuel lance 100 is mounted in the bore 102 of the yoke 104, the end 124 of which opens into an outlet orifice 122, cooperating with the inlet mouth 126 of the injector 110 having a female cone. When mounting the nut 112 on the fuel lance 100, the nut 112 is screwed into the threaded zone 138 of the bore 102.
  • the inner end 140 of the nut 112 comes into contact with the end 142 of the inlet mouth 106 of the tubular element 118.
  • the fixing nut 112 is screwed into the bore 102, the fuel lance 100 starts to rotate around its main axis A until the anti-rotation device 120 comes to prohibit the rotation of the tubular member 118 when the nut 112 is screwed.
  • the elastic member 120 is then clamped onto the tubular member 118 and blocks its rotation. Then the fastener nut 112 receives the fuel conduit through the inlet port 115 and is not shown in the figures.
  • the double torsion spring 120 when dismounting the lance to fuel, the double torsion spring 120 avoids the rotation of the tubular member 118 through the second winding whose winding direction is left. In the unscrewing step, the double torsion spring 120 has the first right-facing winding which loosens from the tubular member 118 and the second left-handed winding which tightens over the tubular member 118 until the spur. 136 abuts the groove 132 and blocks the rotation of the tubular member 118.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention concerne un dispositif anti rotation utilisé dans une lance à carburant alimentant à haute pression un injecteur de carburant.The present invention relates to an anti-rotation device used in a fuel lance supplying a fuel injector at high pressure.

ARRIERE-PLAN TECHNOLOGIQUE DE L'INVENTIONBACKGROUND OF THE INVENTION

Dans un moteur à combustion interne une pompe à carburant alimente en carburant à haute pression chaque cylindre du moteur au moyen d'un injecteur à carburant dédié. Typiquement l'injecteur de carburant est monté dans un alésage réalisé dans une culasse de cylindre et une lance à carburant est utilisé pour fournir un raccordement de fluide entre l'injecteur et le conduit d'alimentation provenant de la pompe à carburant.In an internal combustion engine a fuel pump supplies high pressure fuel to each engine cylinder by means of a dedicated fuel injector. Typically the fuel injector is mounted in a bore in a cylinder head and a fuel lance is used to provide a fluid connection between the injector and the supply conduit from the fuel pump.

Ce type d'assemblage est connu d' EP0974749 et montré dans la figure 1. Une lance à carburant 10 comprend un membre tubulaire 22 ayant une première extrémité 46 adaptée pour coopérer avec le siège 16 d'un injecteur 12, et une deuxième extrémité 48 qui est formée pour définir un siège tronconique 24. Un écrou de fixation 26 se trouve partiellement à l'intérieur d'une extrémité d'un alésage 20, l'écrou de fixation 26 comprenant une région d'extrémité intérieure 28 adaptée pour coopérer avec le siège 24.This type of assembly is known to EP0974749 and shown in the figure 1 . A fuel lance 10 comprises a tubular member 22 having a first end 46 adapted to cooperate with the seat 16 of an injector 12, and a second end 48 which is formed to define a frustoconical seat 24. A fixing nut 26 is located partially within one end of a bore 20, the fixing nut 26 having an inner end region 28 adapted to cooperate with the seat 24.

L'écrou de fixation 26 comprend une région filetée externe 30. Le filetage 30 est agencé pour coopérer avec des filets de vis formés dans l'extrémité 48 de l'alésage 20. En utilisation l'écrou de fixation 26 est fixé à l'intérieur de l'extrémité 48 de l'alésage 20. L'extrémité intérieure 28 de l'écrou de fixation 26 coopère avec le siège 24 de l'élément tubulaire 22 en appliquant une force de compression contre le membre tubulaire 22 pour former un joint d'étanchéité à la fois entre le membre tubulaire 22 et le siège 16 de l'injecteur 12 et entre l'écrou 26 et le membre tubulaire 22.The fixing nut 26 comprises an external threaded region 30. The threading 30 is arranged to cooperate with screw threads formed in the end 48 of the bore 20. In use the fixing nut 26 is fixed to the The inner end 28 of the fastener nut 26 cooperates with the seat 24 of the tubular member 22 by applying a compressive force against the tubular member 22 to form a joint. sealing both between the tubular member 22 and the seat 16 of the injector 12 and between the nut 26 and the tubular member 22.

Le membre tubulaire 22 et l'écrou de fixation 26 comprennent chacun des passages s'étendant axialement et qui définissent ensemble un chemin d'écoulement. Le carburant est en mesure de s'écouler à travers la lance à carburant 10 jusqu'au passage d'alimentation 18 de l'injecteur 12 à partir d'un tuyau de carburant à haute pression 34 fixé à l'écrou de fixation 26 par l'intermédiaire d'un tube standard de fixation 36. Comme illustré sur la figure 1, l'alésage de l'écrou de fixation 26 s'étend axialement et comprend une région de plus grand diamètre qui reçoit un élément de filtre à fente 38 agencé pour filtrer les particules indésirables venant de l'écoulement de carburant vers l'injecteur 12.The tubular member 22 and the fixing nut 26 each comprise axially extending passages which together define a flow path. The fuel is able to flow through the lance to fuel 10 to the supply passage 18 of the injector 12 from a high pressure fuel pipe 34 fixed to the fastening nut 26 via a standard attachment tube 36. As illustrated on the figure 1 the bore of the fixing nut 26 extends axially and comprises a larger diameter region which receives a slot filter element 38 arranged to filter undesirable particles from the fuel flow to the injector 12 .

La culasse 14 comporte un passage 42 qui communique avec l'alésage 20, le passage 42 permettant au carburant à basse pression de s'écouler de l'injecteur 12 à travers l'alésage 20 vers un réservoir de carburant à basse pression (non décrit). L'écrou de fixation 26 comprend un évidement proximale de la région filetée 30 qui positionne un élément d'étanchéité annulaire 32 agencé pour former un joint étanche aux fluides entre l'écrou de fixation 26 et la paroi de la culasse 14 définissant l'alésage 20. Un autre type d'assemblage est connu de US 6 199 539 B1 .The yoke 14 has a passage 42 which communicates with the bore 20, the passage 42 allowing the low pressure fuel to flow from the injector 12 through the bore 20 to a low pressure fuel tank (not described ). The fixing nut 26 comprises a proximal recess of the threaded region 30 which positions an annular sealing element 32 arranged to form a fluid-tight seal between the fixing nut 26 and the wall of the cylinder head 14 defining the bore. 20. Another type of assembly is known to US 6,199,539 B1 .

Un problème se pose au sujet du dispositif de l'alimentation de carburant à haute pression est que l'étanchéité entre la lance à carburant et la buse d'injection nécessite le serrage d'une vis de fixation dans la culasse et le transfert de la charge de la vis vers la lance à carburant. Ce mécanisme entraîne en outre la rotation des pièces et la génération de particules indésirables sous forme de débris, ce qui pourrait conduire à la contamination du carburant et à l'usure des composants.A problem arises about the device of the high-pressure fuel supply is that the seal between the fuel lance and the injection nozzle requires the tightening of a fixing screw in the cylinder head and the transfer of the load the screw towards the fuel lance. This mechanism also causes the rotation of parts and the generation of unwanted particles in the form of debris, which could lead to fuel contamination and component wear.

Pour résoudre ce problème, l'invention consiste en un dispositif anti rotation pour la lance à carburant afin d'empêcher sa rotation à l'intérieur de la culasse et ainsi mieux transmettre la charge voulue.To solve this problem, the invention consists of an anti-rotation device for the fuel lance to prevent its rotation inside the cylinder head and thus better transmit the desired load.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

La présente invention vise à résoudre les problèmes mentionnés précédemment en proposant une solution simple et facile d'assemblage.The present invention aims to solve the problems mentioned above by proposing a simple and easy assembly solution.

Dans ce but, l'invention propose un dispositif anti-rotation d'une lance à carburant. La lance est apte à être agencée dans un alésage s'étendant au travers d'une culasse de cylindre depuis un orifice d'entrée jusqu'à un puits prévu pour recevoir un injecteur de carburant. La lance est adaptée pour permettre à du carburant à haute pression de circuler depuis une bouche d'entrée de la lance jusqu'à la bouche de sortie de la lance coopérant avec la bouche d'entrée de l'injecteur de carburant. La lance à carburant comprend un écrou destiné à être vissé dans un orifice d'entrée de l'alésage et un membre tubulaire comprimé entre le dit écrou et l'injecteur. La lance comprend de plus le dispositif anti rotation apte à interdire la rotation du membre tubulaire lorsque l'écrou est vissé. Le dispositif anti rotation est un élément élastique se déformant dès le début de la rotation de l'écrou de sorte à se bloquer entre le membre tubulaire et la paroi interne de l'alésage et ainsi à interdire la rotation du membre tubulaire. De plus l'élément élastique est apte à être agencé entre la lance et l'alésage. Dans un premier mode de réalisation, l'élément élastique est un ressort de torsion enroulé en hélice cylindrique autour du membre tubulaire. De plus le ressort de torsion comprend un ergot à une extrémité, l'ergot ancré dans une rainure pratiqué dans l'alésage proximale de la bouche d'entrée de l'alésage. Un second mode de réalisation est caractérisé en ce que l'élément élastique est un double ressort de torsion enroulé en hélice cylindrique autour du membre tubulaire. Le double ressort de torsion comprend deux ergots respectivement à chaque extrémité, les deux ergots ancrés dans la rainure de l'alésage. La lance à carburant comprend de plus le dispositif anti rotation tel que décrit dans les différents modes de réalisation. Un moteur à combustion interne comprend de plus un injecteur alimenté par la lance à carburant telle que décrit précédemment dans les différents modes de réalisation.For this purpose, the invention proposes an anti-rotation device for a fuel lance. The lance is adapted to be arranged in a bore extending through a cylinder head from an inlet port to a well for receiving a fuel injector. The lance is adapted to allow high-pressure fuel to flow from an inlet mouth of the lance to the outlet mouth of the lance cooperating with the inlet mouth of the fuel injector. The fuel lance includes a nut intended to be screwed into an inlet port of the bore and a tubular member compressed between said nut and the injector. The lance further comprises anti-rotation device adapted to prohibit the rotation of the tubular member when the nut is screwed. The anti-rotation device is an elastic element deforming from the beginning of the rotation of the nut so as to lock between the tubular member and the inner wall of the bore and thus to prohibit the rotation of the tubular member. In addition, the elastic element is able to be arranged between the lance and the bore. In a first embodiment, the elastic element is a torsion spring wound in a cylindrical helix around the tubular member. In addition the torsion spring comprises a lug at one end, the lug anchored in a groove formed in the proximal bore of the inlet mouth of the bore. A second embodiment is characterized in that the elastic element is a double torsion spring wound in a cylindrical helix around the tubular member. The double torsion spring comprises two lugs respectively at each end, the two lugs anchored in the groove of the bore. The fuel lance further comprises anti-rotation device as described in the various embodiments. An internal combustion engine further comprises an injector fed by the fuel lance as previously described in the various embodiments.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, et en regard des dessins annexés, donnés à titre d'exemple non limitatif et sur lesquels:

  • Figure 1 est une vue en coupe d'une lance à carburant connu.
  • Figure 2 est une vue en coupe de l'ensemble lance à carburant-injecteur selon l'invention.
  • Figure 3 est une vue en coupe du dispositif anti rotation avec un ressort de torsion selon l'invention.
  • Figure 4 est une vue en coupe du dispositif anti rotation avec un double ressort selon l'invention.
  • Figure 5 est une vue en coupe du membre tubulaire et de l'écrou de fixation.
  • Figure 6 est une vue en coupe selon l'axe VI représenté sur la figure 5.
Other features, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the accompanying drawings, given by way of non-limiting example and in which:
  • Figure 1 is a sectional view of a known fuel lance.
  • Figure 2 is a sectional view of the fuel-injector lance assembly according to the invention.
  • Figure 3 is a sectional view of the anti-rotation device with a torsion spring according to the invention.
  • Figure 4 is a sectional view of the anti-rotation device with a double spring according to the invention.
  • Figure 5 is a sectional view of the tubular member and the fixing nut.
  • Figure 6 is a sectional view along the axis VI shown in FIG. figure 5 .

DESCRIPTION DES MODES DE REALISATION PREFERESDESCRIPTION OF THE PREFERRED EMBODIMENTS

Comme illustré dans la figure 2, la lance à carburant 100 est agencée dans un alésage long 102 percé dans un haut moteur 104 appelé aussi culasse de cylindre. La lance à carburant 100 s'étend depuis un orifice d'entrée 116 jusqu'à un puits 108 prévu pour recevoir un injecteur de carburant 110.As illustrated in figure 2 , the fuel lance 100 is arranged in a long bore 102 drilled in a high engine 104 also called cylinder head. The fuel lance 100 extends from an inlet port 116 to a well 108 provided to receive a fuel injector 110.

La lance à carburant 100 comprend un membre tubulaire 118 agencé dans l'alésage long 102, un écrou de fixation 112 coopérant avec le membre tubulaire 118 et un dispositif anti rotation 120 monté sur le membre tubulaire.The fuel lance 100 comprises a tubular member 118 arranged in the long bore 102, a fastener nut 112 cooperating with the tubular member 118 and an anti-rotation device 120 mounted on the tubular member.

Le membre tubulaire 118 s'étend le long de l'alésage long 102 depuis l'orifice d'entrée 116 de la culasse 104 jusqu'à un orifice de sortie 122 de la culasse 104 débouchant dans le puits 108. Le membre tubulaire 118 comprend une bouche d'entrée 106 et une bouche de sortie 124. Comme illustré dans la figure 5, la bouche d'entrée 106 a une extrémité 142 en forme sphérique male dont le sommet est tranché. La bouche de sortie 124 a une surface de forme sphérique male. La bouche de sortie 124 vient coopérer avec une bouche d'entrée 126 de l'injecteur 110 ayant une surface de forme conique femelle. Le membre tubulaire 118 est de forme cylindrique. Le membre tubulaire 118 comprend une gorge 128 proximale de l'orifice d'entrée 116 de la culasse 104 pour recevoir un dispositif anti rotation 120.The tubular member 118 extends along the long bore 102 from the inlet 116 of the yoke 104 to an outlet 122 of the yoke 104 opening into the well 108. The tubular member 118 comprises an inlet mouth 106 and an outlet mouth 124. As shown in FIG. figure 5 the inlet mouth 106 has an end 142 in male spherical shape whose apex is sliced. The outlet mouth 124 has a male spherical surface. The outlet mouth 124 cooperates with an inlet mouth 126 of the injector 110 having a female conical surface. The tubular member 118 is cylindrical in shape. The tubular member 118 comprises a groove 128 proximal to the inlet port 116 of the breech 104 to receive an anti-rotation device 120.

Dans la figure 2, l'écrou de fixation 112 est monté sur la bouche d'entrée 106 du membre tubulaire 118 proximale de l'orifice d'entrée 116 de la culasse 104. L'écrou 112 se trouve partiellement à l'extérieur de l'orifice d'entrée 116. Comme illustré dans la figure 5, l'écrou de fixation 112 comprend un évidement pour recevoir un joint 130. Le joint 130 est agencé pour former une étanchéité au carburant entre l'écrou de fixation 112 et la surface de la culasse 104 délimitant l'alésage long 102. Le joint 130 est distal de la bouche de sortie 124 de la lance 100 en contact avec l'injecteur 110. Comme illustré dans la figure 5, l'écrou de fixation 112 comprend une région filetée extérieurement 138 qui est agencée pour coopérer avec les filets de vis formées dans l'orifice d'entrée 116 de la culasse 104. L'écrou 112 comprend intérieurement un alésage dont une extrémité 115 en forme de cône distale du membre tubulaire 118 et une extrémité 140 en forme de cône femelle. L'extrémité intérieure 140 de l'écrou de fixation 112 orienté vers l'intérieur de l'alésage long 102 coopère avec la bouche d'entrée 106 du membre tubulaire 118. Le cône de l'extrémité intérieure 140 est en compression axiale contre l'extrémité 142.In the figure 2 , the fixing nut 112 is mounted on the inlet mouth 106 of the tubular member 118 proximal to the inlet port 116 of the cylinder head 104. The nut 112 is located partially outside the orifice 116. As illustrated in the figure 5 , the fixing nut 112 comprises a recess for receiving a seal 130. The seal 130 is arranged to form a fuel seal between the fixing nut 112 and the surface of the cylinder head 104 defining the long bore 102. The seal 130 is distal from the outlet mouth 124 of the lance 100 in contact with the injector 110. As illustrated in FIG. figure 5 , the fixing nut 112 comprises an externally threaded region 138 which is arranged to cooperate with the screw threads formed in the inlet orifice 116 of the cylinder head 104. The nut 112 internally comprises a bore, one end 115 of which distal cone shape of the tubular member 118 and a female cone-shaped end 140. The inner end 140 of the fixing nut 112 facing the inside of the long bore 102 cooperates with the inlet mouth 106 of the tubular member 118. The cone of the inner end 140 is in axial compression against the end 142.

Le dispositif anti rotation 120 est un élément élastique se déformant dès le début de la rotation de l'écrou de fixation 112. L'élément élastique est agencé entre la lance 100 et l'alésage 102. Le dispositif anti rotation 120 est monté autour de la gorge 128 du membre tubulaire 118 à une distance proximale de la bouche d'entrée 106. Le dispositif anti rotation 120 est en contact avec une rainure 132 pratiquée dans l'alésage 102 de la culasse 104 du cylindre.The anti-rotation device 120 is an elastic element that deforms from the beginning of the rotation of the fixing nut 112. The elastic element is arranged between the lance 100 and the bore 102. The anti-rotation device 120 is mounted around the groove 128 of the tubular member 118 at a distance proximal to the inlet mouth 106. The anti-rotation device 120 is in contact with a groove 132 formed in the bore 102 of the cylinder head 104.

Dans un premier mode de réalisation illustré dans la figure 3, le dispositif anti rotation 120 est un ressort de torsion enroulé en hélice cylindrique autour du membre tubulaire 118. Le ressort 120 est en contact à la fois avec la gorge 128 pratiquée sur une surface extérieure du membre tubulaire 118 et la rainure 132 pratiquée dans l'alésage 102. Le ressort de torsion 120 comprend un ergot 134 à une extrémité. Comme illustré dans la figure 6, l'ergot 134 est ancré dans la rainure 132 de l'alésage 102, ce qui signifie que l'ergot est inséré dans la rainure et qu'il peut exercer une rotation dans la rainure autour de l'axe principal A. Le ressort 120 présente deux positions, une première position relâchée quand le ressort 120 est au repos, une deuxième position contrainte quand on applique un couple de torsion de serrage. Le sens d'enroulement du ressort de torsion 120 est à droite c'est-à-dire que l'hélice monte à droite. Les données suivantes sont données à titre d'exemple pour illustrer le premier mode de réalisation. La longueur de la lance à carburant est sensiblement égale à 100 mm. La longueur de l'écrou de fixation est sensiblement égale à 55 mm avec un diamètre sensiblement égale à 22 mm. Le diamètre de l'alésage 102 est sensiblement égal à 12 mm. Le ressort est de longueur sensiblement égale à 12 mm avec un nombre de spires de 5. L'enroulement à droite du ressort 120 sert au vissage de la lance à carburant 100.In a first embodiment illustrated in the figure 3 the anti-rotation device 120 is a torsion spring wound in cylindrical helix around the tubular member 118. The spring 120 is in contact with both the groove 128 on an outer surface of the tubular member 118 and the groove 132 in the tubular member 118. Bore 102. The torsion spring 120 includes a lug 134 at one end. As illustrated in figure 6 , the pin 134 is anchored in the groove 132 of the bore 102, which means that the pin is inserted into the groove and that it can rotate in the groove about the main axis A. The spring 120 has two positions, a first position released when the spring 120 is at rest, a second position constrained when applying a tightening torque. The winding direction of the torsion spring 120 is on the right that is to say that the helix rises to the right. The following data is given by way of example to illustrate the first embodiment. The length of the fuel lance is substantially equal to 100 mm. The length of the fixing nut is substantially equal to 55 mm with a diameter substantially equal to 22 mm. The diameter of the bore 102 is substantially equal to 12 mm. The spring is of length substantially equal to 12 mm with a number of turns of 5. The winding to the right of the spring 120 serves to screw the fuel lance 100.

Dans un deuxième mode de réalisation illustré dans la figure 4, le dispositif anti rotation 120 est un double ressort enroulé sur l'élément tubulaire 118. Le ressort de torsion 120 enroulé en hélice cylindrique est doté de deux ergots 134,136 respectivement situés aux deux extrémités du ressort 120. Le premier ergot 134 est ancré dans la rainure 132 de l'alésage 102 et le second ergot 136 est ancré dans la rainure 132 de l'alésage 102 distale du premier ergot 134. Les deux ergots 134, 136 sont ancrés ce qui signifie qu'ils sont insérés dans la rainure et qu'ils peuvent tourner autour de l'axe principal A. Le ressort 120 présente deux positions, une première position relâchée quand le ressort 120 est au repos, une deuxième position contrainte quand on applique un couple de torsion de serrage ou de desserrage. Le ressort 120 présente deux enroulements opposés. Les deux enroulements peuvent avoir soit un nombre de spires identique, soit un nombre différent de spires. De même, les raideurs angulaires des deux enroulements peuvent être identiques ou différentes. Le sens d'un des deux enroulements du ressort 120 est à droite pour le vissage de la lance à carburant 100 et le sens de l'autre enroulement est à gauche pour le dévissage de la lance à carburant 100. Les données suivantes sont données à titre d'exemple pour illustrer le second mode de réalisation. La longueur de la lance à carburant est sensiblement égale à 100 mm. La longueur de l'écrou de fixation est sensiblement égale à 55 mm avec un diamètre sensiblement égale à 22 mm. Le diamètre de l'alésage 102 est sensiblement égal à 12 mm. Le double ressort 120 a une longueur sensiblement égale à 23 mm avec un nombre de spires total de 10 spires, 5 spires dans un sens d'enroulement du ressort 120 et 5 spires dans l'autre sens d'enroulement. L'enroulement à droite du double ressort 120 sert au vissage de la lance à carburant 100 et l'enroulement à gauche sert au dévissage de la lance à carburant 100. Si le vissage de la lance à carburant 100 est choisi dans le sens inverse des aiguilles d'un montre alors le pas de vis est à gauche ainsi le double ressort de torsion 120 présente un premier sens d'enroulement à gauche du double ressort 120 pour le vissage et un deuxième sens d'enroulement à droite du double ressort 120 pour le dévissage de la lance à carburant 100.In a second embodiment illustrated in the figure 4 the anti-rotation device 120 is a double spring wound on the tubular element 118. The torsion spring 120 wound in a cylindrical helix is provided with two lugs 134, 136 respectively located at the two ends of the spring 120. first lug 134 is anchored in the groove 132 of the bore 102 and the second lug 136 is anchored in the groove 132 of the bore 102 distal of the first lug 134. The two lugs 134, 136 are anchored which means that they are inserted into the groove and that they can rotate about the main axis A. The spring 120 has two positions, a first position released when the spring 120 is at rest, a second position constrained when applying a torque of tightening or loosening. The spring 120 has two opposite windings. The two windings may have either an identical number of turns or a different number of turns. Likewise, the angular stiffnesses of the two windings may be identical or different. The direction of one of the two windings of the spring 120 is on the right for the screwing of the fuel lance 100 and the direction of the other winding is on the left for the unscrewing of the fuel lance 100. The following data is given in FIG. as an example to illustrate the second embodiment. The length of the fuel lance is substantially equal to 100 mm. The length of the fixing nut is substantially equal to 55 mm with a diameter substantially equal to 22 mm. The diameter of the bore 102 is substantially equal to 12 mm. The double spring 120 has a length substantially equal to 23 mm with a total number of turns of 10 turns, 5 turns in a winding direction of the spring 120 and 5 turns in the other direction of winding. The winding on the right of the double spring 120 serves to screw the fuel lance 100 and the winding on the left serves to unscrew the fuel lance 100. If the screwing of the fuel lance 100 is chosen in the opposite direction of the clockwise then the thread is on the left so the double torsion spring 120 has a first winding direction to the left of the double spring 120 for screwing and a second winding direction to the right of the double spring 120 for the unscrewing of the fuel lance 100.

Dans le premier mode de réalisation, lors du vissage de l'écrou 112, le ressort de torsion 120 tourne autour de son axe principal A dans le sens de vissage jusqu'au contact entre l'ergot 134 et la rainure 132 de l'alésage 102 dans la culasse 104. Le ressort 120 se resserre autour de l'élément tubulaire 118 lors de la rotation de l'écrou 112 en se comprimant jusqu'à bloquer la rotation de l'élément tubulaire 118. Dès l'arrêt du vissage le ressort 120 reste serré sur le membre tubulaire 118 et l'ergot 134 reste en contact avec la rainure 132.In the first embodiment, during the screwing of the nut 112, the torsion spring 120 rotates about its main axis A in the screwing direction until the contact between the pin 134 and the groove 132 of the bore 102 in the cylinder head 104. The spring 120 is tightened around the tubular element 118 during the rotation of the nut 112 by compressing until blocking the rotation of the tubular element 118. As soon as the screwing is stopped, the spring 120 remains tight on the tubular member 118 and the lug 134 remains in contact with the groove 132.

Dans le second mode de réalisation, lors du vissage de l'écrou 112, le double ressort de torsion 120 amorce la rotation autour de son axe principal A jusqu'au contact entre l'ergot 134 et la rainure 132 de l'alésage 102 dans la culasse 104. Le ressort 120 se resserre autour de l'élément tubulaire 118 avec un des enroulements de spire lors de la rotation de l'écrou 112 en se comprimant et le ressort 120 bloque la rotation l'élément tubulaire 118. Lorsque l'arrêt du vissage a lieu, le ressort 120 reste serré sur l'élément tubulaire 118 et l'ergot 134 reste en contact avec la rainure 132. Si il y a dévissage de l'écrou de fixation 112, le ressort de torsion 120 se desserre autour du membre tubulaire 118 pour l'enroulement à droite tandis que l'enroulement à gauche va se resserrer progressivement sur le membre tubulaire 118 grâce au contact entre l'ergot 136 et la rainure 132 de l'alésage 102 dans la culasse 104 jusqu'à bloquer la rotation du membre tubulaire 118. Ainsi l'écrou 112 pourra être desserré sans rotation du membre tubulaire 118 et la génération de particules indésirables sera évitée aussi au desserrage.In the second embodiment, during the screwing of the nut 112, the double torsion spring 120 initiates the rotation about its main axis A until the contact between the pin 134 and the groove 132 of the bore 102 in the cylinder head 104. The spring 120 is tightened around the tubular element 118 with one of the turns of the coil during the rotation of the nut 112 by compressing itself and the spring 120 blocks the rotation of the tubular element 118. stopping of the screwing takes place, the spring 120 remains tight on the tubular element 118 and the lug 134 remains in contact with the groove 132. If there is unscrewing of the fixing nut 112, the torsion spring 120 loosens around the tubular member 118 for the winding on the right while the winding on the left will gradually tighten on the tubular member 118 through the contact between the pin 136 and the groove 132 of the bore 102 in the cylinder head 104 until to block the rotation of the tubular member 118. Thus the nut 112 can be loosened without rotation of the tubular member 118 and the generation of undesirable particles will be avoided also loosening.

Pour assembler la lance à carburant 100, l'élément élastique 120 est monté en l'enfilant autour du membre tubulaire 118 par l'extrémité 106 jusqu'à la gorge 128 de l'élément tubulaire 118 proximale de l'extrémité 106 recevant l'écrou de fixation 112. L'élément élastique 120 est monté de manière serré sur l'élément tubulaire 118. Ensuite la lance à carburant 100 est montée dans l'alésage 102 de la culasse 104 dont l'extrémité 124 débouche dans un orifice de sortie 122, coopérant avec la bouche d'entrée 126 de l'injecteur 110 ayant un cône femelle. Lors du montage de l'écrou 112 sur la lance à carburant 100, l'écrou 112 est vissé dans la zone filetée 138 de l'alésage 102. L'extrémité intérieure 140 de l'écrou 112 vient en contact avec l'extrémité 142 de la bouche d'entrée 106 de l'élément tubulaire 118. Lors du vissage de l'écrou de fixation 112 dans l'alésage 102, la lance à carburant 100 commence à tourner autour de son axe principal A jusqu'à ce que le dispositif anti rotation 120 vienne interdire la rotation du membre tubulaire 118 lorsque l'écrou 112 est vissé. L'élément élastique 120 est alors serré sur l'élément tubulaire 118 et bloque sa rotation. Ensuite l'écrou de fixation 112 reçoit le conduit à carburant dans par l'orifice d'entrée 115 et qui n'est pas représenté dans les figures.To assemble the fuel lance 100, the elastic member 120 is mounted by threading it around the tubular member 118 through the end 106 to the groove 128 of the tubular member 118 proximal to the end 106 receiving the tubular member 118. Fixing nut 112. The elastic element 120 is mounted tightly on the tubular element 118. Then the fuel lance 100 is mounted in the bore 102 of the yoke 104, the end 124 of which opens into an outlet orifice 122, cooperating with the inlet mouth 126 of the injector 110 having a female cone. When mounting the nut 112 on the fuel lance 100, the nut 112 is screwed into the threaded zone 138 of the bore 102. The inner end 140 of the nut 112 comes into contact with the end 142 of the inlet mouth 106 of the tubular element 118. When the fixing nut 112 is screwed into the bore 102, the fuel lance 100 starts to rotate around its main axis A until the anti-rotation device 120 comes to prohibit the rotation of the tubular member 118 when the nut 112 is screwed. The elastic member 120 is then clamped onto the tubular member 118 and blocks its rotation. Then the fastener nut 112 receives the fuel conduit through the inlet port 115 and is not shown in the figures.

Pour le second mode de réalisation, lors du démontage de la lance à carburant, le double ressort de torsion 120 permet d'éviter la rotation du membre tubulaire 118 par le biais du second enroulement dont le sens d'enroulement est à gauche. A l'étape du dévissage, le double ressort de torsion 120 a le premier enroulement orienté à droite qui se desserre du membre tubulaire 118 et le second enroulement orienté à gauche qui se resserre sur le membre tubulaire 118 jusqu'à ce que l'ergot 136 vienne en butée dans la rainure 132 et bloque la rotation du membre tubulaire 118.For the second embodiment, when dismounting the lance to fuel, the double torsion spring 120 avoids the rotation of the tubular member 118 through the second winding whose winding direction is left. In the unscrewing step, the double torsion spring 120 has the first right-facing winding which loosens from the tubular member 118 and the second left-handed winding which tightens over the tubular member 118 until the spur. 136 abuts the groove 132 and blocks the rotation of the tubular member 118.

Claims (8)

  1. Anti-rotation device (120) of a fuel lance (100), the lance (100) being able to be arranged in a bore (102) which extends through a cylinder head (104), from an intake orifice (116) to a pit (108) which is provided in order to receive a fuel injector (110), the lance (100) being designed to allow high-pressure fuel to circulate from an intake mouth (106) of the lance to the outlet mouth (124) of the lance (100) cooperating with the intake mouth (126) of the fuel injector (110), the fuel lance (100) comprising a nut (112) which is designed to be screwed into an intake orifice (116) in the bore (102), and a tubular member (118) compressed between said nut (112) and the injector (110), the lance (100) additionally comprising the anti-rotation device (120) which can prevent the rotation of the tubular member (118) when the nut (112) is screwed,
    characterized in that:
    the anti-rotation device (120) is a resilient element which is deformed as soon as rotation of the nut (112) begins, such as to be blocked between the tubular member (118) and the inner wall of the bore (102), and thus prevent the rotation of the tubular member (118).
  2. Anti-rotation device (120) according to the preceding claim, characterized in that the resilient element can be arranged between the lance (100) and the bore (102).
  3. Anti-rotation device (120) according to either of the preceding claims, characterized in that the resilient element is a torsion spring (120) which is wound in a cylindrical helix around the tubular member.
  4. Anti-rotation device (120) according to Claim 3, characterized in that the torsion spring (120) comprises a lug (134) at one end, the lug (134) being anchored in a groove (132) provided in the proximal bore (102) in the intake orifice (116) of the bore (102).
  5. Anti-rotation device (120) according to either of Claims 1 to 2, characterized in that the resilient element is a double torsion spring (120) wound in a cylindrical helix around the tubular member (118).
  6. Anti-rotation device (120) according to Claim 5, characterized in that the double torsion spring (120) comprises two lugs (134, 136) respectively at each end, the two lugs (134, 136) being anchored in the groove (132) in the bore (102).
  7. Fuel lance (100) comprising an anti-rotation device (120) according to any one of the preceding claims.
  8. Internal combustion engine comprising an injector (110) supplied by a fuel lance (100) according to Claim 7.
EP15804329.9A 2014-11-07 2015-11-06 Anti-rotation device of a fuel lance Active EP3215732B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1460771A FR3028296B1 (en) 2014-11-07 2014-11-07 DEVICE FOR ANTI ROTATION OF A FUEL LANCE
PCT/EP2015/075919 WO2016071496A1 (en) 2014-11-07 2015-11-06 Anti-rotation device of a fuel lance

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EP3215732A1 EP3215732A1 (en) 2017-09-13
EP3215732B1 true EP3215732B1 (en) 2019-01-09

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US (1) US10125731B2 (en)
EP (1) EP3215732B1 (en)
JP (1) JP6673607B2 (en)
KR (1) KR102381694B1 (en)
CN (1) CN107076079B (en)
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CN111577499B (en) * 2020-04-26 2021-11-05 安徽航瑞航空动力装备有限公司 Oil inlet device of side oil inlet oil injector and engine

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WO2016071496A1 (en) 2016-05-12
JP6673607B2 (en) 2020-03-25
KR20170080634A (en) 2017-07-10
KR102381694B1 (en) 2022-04-01
FR3028296A1 (en) 2016-05-13
JP2017534020A (en) 2017-11-16
US10125731B2 (en) 2018-11-13
CN107076079A (en) 2017-08-18
CN107076079B (en) 2019-07-16
EP3215732A1 (en) 2017-09-13
FR3028296B1 (en) 2016-11-11
US20170321642A1 (en) 2017-11-09

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