EP3507482A1 - Coil assembly - Google Patents

Coil assembly

Info

Publication number
EP3507482A1
EP3507482A1 EP17752157.2A EP17752157A EP3507482A1 EP 3507482 A1 EP3507482 A1 EP 3507482A1 EP 17752157 A EP17752157 A EP 17752157A EP 3507482 A1 EP3507482 A1 EP 3507482A1
Authority
EP
European Patent Office
Prior art keywords
hole
coil assembly
degassing
section
axial
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.)
Granted
Application number
EP17752157.2A
Other languages
German (de)
French (fr)
Other versions
EP3507482B1 (en
Inventor
Philippe Legrand
Bruno Bimbenet
Stéphanie LEFEVRE
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 Technologies IP Ltd
Original Assignee
Delphi Technologies IP Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP3507482A1 publication Critical patent/EP3507482A1/en
Application granted granted Critical
Publication of EP3507482B1 publication Critical patent/EP3507482B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M55/007—Venting means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • 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

Definitions

  • the present invention relates to a fuel injector and has particularly, but not exclusively, application to fuel injectors for supplying fuel under pressure to a combustion chamber of an internal combustion engine.
  • Fuel injection systems for modern internal combustion engines, particularly compression ignition engines, include a plurality of fuel injectors arranged to emit an atomized jet of high pressure fuel into a combustion chamber of the engine.
  • a fuel injector known to be used in such a system includes an injection needle.
  • the needle is slidable within the bore formed in a nozzle body and engageable with a seat to control the dispensing of fuel through one or more exit openings.
  • an actuator When at the beginning of the injection, an actuator is electrically powered to achieve the opening, which causes the movement of a frame and a valve member, also called valve stem by professionals.
  • the control rod is located in the low pressure chamber, the control rod then moves up against the action of a coil spring of the actuator.
  • the length of the spring is reduced and an oscillation propagates spiral turn and then propagates on the control rod and the oscillation thus goes back and forth creating disturbances of the fuel flow.
  • the propagation of the oscillation disturbs the displacement of the armature integral with the body of the control rod. Oscillations occur on the forces applied to close or open the control valve. This problem is explained by a disturbed displacement of the reinforcement caused by oscillations experienced by the spring. Moreover this problem will be solved by the present invention, which will be described later.
  • the present invention aims to solve the problem of displacement of the armature caused by oscillations experienced by the spring.
  • the invention consists of a coil assembly of an electromagnetic actuator adapted to be in a fuel injector.
  • the coil assembly includes a magnetic core extending along a major axis, a coil wound around the core, the coil being overmolded forming a cylindrical overmold and extending axially from a first transverse face to at a second surface 48.
  • the overmolded coil assembly further includes an axial blind hole extending inwardly of the coil assembly from the first surface at a distal end.
  • the blind hole is adapted to accommodate at least one spring to solicit a magnetic armature.
  • the coil assembly is further provided with a degassing hole traversing the core and overmolding from the blind axial hole to an axial outer cylindrical surface.
  • the degassing hole is formed in the magnetic core.
  • the degassing hole has a restriction arranged in a first proximal section of the blind axial hole.
  • the first section has a first diameter D62, a first length L62 with the following characteristics:
  • the degassing hole has a second section with a second diameter D64 at a proximal end of a return circuit and a second length L64:
  • the degassing hole is disposed proximal to the distal end of the axial blind hole.
  • the degassing hole is proximal to the first face of the coil.
  • a diameter D50b of the blind hole is smaller than a mean diameter D50a of the axial blind hole in which communicates the first section of the calibrated degassing hole.
  • the degassing hole makes an angle with the main axis between 80 degrees and 120 degrees. The angle can be 90 °.
  • an actuator of the fuel injector comprises the coil assembly as previously described.
  • a fuel injector comprises the actuator as described above.
  • a method of process fabrication of a coil assembly as previously described comprises the following steps:
  • the degassing hole can be achieved by the use of an insert during overmolding of the wire.
  • Figure 1 is a partial section of an injector
  • Figure 2 is an isometric view of a coil subassembly.
  • Figure 3 is an isometric view of a coil assembly
  • Figure 4 is a section of the degassing hole DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the injector 10 extends along a longitudinal axis X and comprises from bottom to top, in the conventional and nonlimiting sense of the figures, a nozzle assembly 12 comprising a valve element 14 or commonly called a needle 14 arranged in a body of nozzle 16, a control rod 34 arranged in a valve body 20, an actuator 22 arranged in an actuator body 24.
  • the needle 14 is arranged axially sliding in a longitudinal cylindrical bore 26 of the nozzle body between a closed position wherein the needle 14 is in contact with a nozzle body seat (not shown) and an open position where the needle 14 is spaced from the seat (not shown).
  • the injector 10 is provided with a fuel circulation circuit which makes it possible to supply high pressure fuel via a high pressure circuit from an inlet orifice arranged in an upper part of the injector. 10 to the injection holes (not shown) arranged in a lower part of the injector 10.
  • the electromagnetic actuator 22 comprises a set of fixed electrical coil 28, a movable magnetic armature 30 fixed and integral with a valve element 31 is commonly called control rod 34 moving towards the coil assembly 28 when it is electrically powered and an elastic device 32 permanently pushing the magnetic armature 30 to a position remote from the coil assembly 28.
  • the coil assembly 28 comprises a cylindrical overmolding 42 and a coil subassembly 43 comprising two ends 36, a core 38 and a coil 40 wound around the core 38. Both ends 36 extend along the main axis X to an upper end of the subassembly 43.
  • the coil 40 is overmolded forming the cylindrical overmolding 42.
  • the coil 40 extends axially from a first transverse face 46 extending axially to a second surface 48.
  • overmolded coil assembly 28 further includes an axial blind hole 50 extending inwardly of the coil assembly 28 from a first end 51 to a second end 52.
  • the blind hole 50 is adapted to accommodate at least two springs 54, 56 for biasing the magnetic armature 30.
  • the coil assembly 28 is further provided with a degassing hole 58 passing through the overmolding 42 from the blind axial hole 50 at an axial outer cylindrical surface 60.
  • the degassing hole 58 has a restriction arranged in a first section 62 proximal of the blind axial hole 50.
  • the restriction is a reduction in the diameter of the hole as placed in the passage of the fluid in movement it limits its flow or changes the pressure in the first portion 62 of the degassing hole.
  • the restriction also produces the necessary pressure drops of the fluid under pressure in a leakage return circuit 61.
  • the degassing hole 58 has a first section 62 having a first diameter D62, a first length L62 with the following characteristics:
  • the degassing hole 58 has a second section 64 with a second diameter D64 between the first section 62 and the transverse outer surface 60 of the leakage return circuit 61 and a second length L64:
  • the choice of the dimensions of the two sections 62, 64 allows a less turbulent flow towards the leakage return circuit 61.
  • the degassing hole 58 is disposed proximal to the distal second end 52. In other alternatives not shown the degassing hole 58 may be proximal to the first end 51 of the blind hole.
  • the degassing hole 58 makes an angle of 90 ° with the main axis X. In an alternative to the embodiment not shown, the degassing hole 58 can make an angle of between 80 degrees and 120 degrees with the main axis X .
  • the blind hole 50 extends along the longitudinal axis X.
  • the blind hole 50 has a first diameter D50a and a second diameter D50b.
  • the first diameter D50a is the average value of the diameter of the hole 50.
  • the second diameter D50b is smaller than the first average diameter D50a of the hole.
  • the elastic device 32 comprises two helical springs 54, 56 separated by a separator member 66 or pin 66. In other alternatives the elastic device 66 may comprise a single spring 54, 56.
  • the elastic device 32 is arranged in the axial blind hole 50. According to Figure 1, the first spring 54 is compressed between a first face 68 of the pin 66 and the second end 52 of the hole. The second spring 56 is compressed between the second face 69 of the pin and the electric armature 30.
  • the method of manufacturing the coil assembly 28 comprises the following steps:
  • the calibrated degassing hole 58 is thus formed in the magnetic part (38).
  • the degassing hole 58 may be made by laser technology or by any other means.
  • the shape of the degassing hole 58 may be round, square or conical or any other shape.
  • the overpressure in the axial hole 50 is suppressed by the degassing hole 58 which is fluid communication with the axial blind hole 50 through the first section 62 of the degassing hole and the second section 64 arranged in the extension of the first section 62 and between the first section 62 and a low pressure zone which communicates with the leakage return circuit 61 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Coil assembly (28) in a fuel injector (10) comprising: - a magnetic core (38); - a winding (40) wound around the core (38), the winding (40) being overmoulded and forming a cylindrical overmoulding (42); and - the overmoulded coil assembly (28) additionally comprising an axial blind hole (50) extending towards the interior of the coil assembly (28) from the first surface (51) to a distal end (52), the blind hole (50) being suitable for housing at least one spring (54, 56) for loading a magnetic armature (30). The coil assembly (28) is provided with a degassing hole (58) passing through the core (38) and the overmoulding (42) from the blind axial hole (50) to an axial outer cylindrical surface (60), the degassing hole (58) being provided in the magnetic core (38) and having a restriction that is arranged in a first section (62) that is proximal to the blind axial hole (50).

Description

ENSEMBLE DE BOBINE  SPOOL ASSEMBLY
DOMAINE TECHNIQUE TECHNICAL AREA
La présente invention concerne un injecteur de carburant et présente en particulier, mais non exclusivement une application à des injecteurs de carburant destinés à délivrer du carburant sous pression à une chambre de combustion d'un moteur à combustion interne. ARRIERE-PLAN TECHNOLOGIQUE DE L'INVENTION.  The present invention relates to a fuel injector and has particularly, but not exclusively, application to fuel injectors for supplying fuel under pressure to a combustion chamber of an internal combustion engine. BACKGROUND OF THE INVENTION
Des systèmes d'injection de carburant pour moteurs à combustion interne moderne, en particulier les moteurs à allumage par compression, comprennent une pluralité d'injecteurs de carburant agencés pour émettre un jet atomisé de carburant à haute pression dans une chambre de combustion du moteur.  Fuel injection systems for modern internal combustion engines, particularly compression ignition engines, include a plurality of fuel injectors arranged to emit an atomized jet of high pressure fuel into a combustion chamber of the engine.
Un injecteur de carburant connu pour être utilisé dans un tel système. Il comprend une aiguille d'injection. L'aiguille est glissante à l'intérieur de l'alésage formé dans un corps de buse et pouvant coopérer avec un siège pour commander la distribution de carburant à travers une ou plusieurs ouvertures de sortie.  A fuel injector known to be used in such a system. It includes an injection needle. The needle is slidable within the bore formed in a nozzle body and engageable with a seat to control the dispensing of fuel through one or more exit openings.
Lorsqu'au début de l'injection, un actionneur est alimenté électriquement pour réaliser l'ouverture, ce qui entraine le déplacement d'une armature et un élément de soupape, également appelé tige de vanne par les professionnels. La tige de commande est située dans la chambre à basse pression, la tige de commande se déplace alors vers le haut contre l'action d'un ressort de bobine de l'actionneur. A ce stade, la longueur du ressort est réduite et une oscillation se propage de spire en spire pour ensuite se propager sur la tige de commande et l'oscillation fait ainsi des allers retours créant des perturbations du flux de carburant. La propagation de l'oscillation vient perturber le déplacement de l'armature solidaire de l'organe de la tige de commande. Il se produit alors des oscillations sur les forces appliquées pour fermer ou ouvrir la soupape de commande. Ce problème s'explique par un déplacement perturbé de l'armature causé par des oscillations subies par le ressort. De plus ce problème sera résolu par la présente invention, qui va être décrite plus loin. When at the beginning of the injection, an actuator is electrically powered to achieve the opening, which causes the movement of a frame and a valve member, also called valve stem by professionals. The control rod is located in the low pressure chamber, the control rod then moves up against the action of a coil spring of the actuator. At this point, the length of the spring is reduced and an oscillation propagates spiral turn and then propagates on the control rod and the oscillation thus goes back and forth creating disturbances of the fuel flow. The propagation of the oscillation disturbs the displacement of the armature integral with the body of the control rod. Oscillations occur on the forces applied to close or open the control valve. This problem is explained by a disturbed displacement of the reinforcement caused by oscillations experienced by the spring. Moreover this problem will be solved by the present invention, which will be described later.
RESUME DE L'INVENTION SUMMARY OF THE INVENTION
La présente invention vise à résoudre le problème de déplacement de l'armature causé par les oscillations subies par le ressort. L'invention consiste en un ensemble de bobine d'un actionneur électromagnétique adapté pour être dans un injecteur de carburant. L'ensemble de bobine comprend un noyau magnétique s'étendant le long d'un axe principal, une bobinage enroulé autour du noyau, le bobinage étant surmoulé formant un surmoulage cylindrique et s'étendant axialement à partir d'une première face transverse jusqu'à une seconde surface 48. L'ensemble de bobine surmoulé comprend de plus un trou borgne axial s'étendant vers l'intérieur de l'ensemble de bobine à partir de la première surface à une extrémité distale. Le trou borgne est adapté pour loger au moins un ressort afin de solliciter une armature magnétique. L'ensemble de bobine est en outre muni d'un trou de dégazage traversant le noyau et le surmoulage à partir du trou axial borgne jusqu'à une surface cylindrique externe axiale. Le trou de dégazage est ménagé dans le noyau magnétique. Le trou de dégazage présente une restriction agencée dans un premier tronçon proximal du trou axial borgne. Le premier tronçon présente un premier diamètre D62, une première longueur L62 avec pour caractéristiques :  The present invention aims to solve the problem of displacement of the armature caused by oscillations experienced by the spring. The invention consists of a coil assembly of an electromagnetic actuator adapted to be in a fuel injector. The coil assembly includes a magnetic core extending along a major axis, a coil wound around the core, the coil being overmolded forming a cylindrical overmold and extending axially from a first transverse face to at a second surface 48. The overmolded coil assembly further includes an axial blind hole extending inwardly of the coil assembly from the first surface at a distal end. The blind hole is adapted to accommodate at least one spring to solicit a magnetic armature. The coil assembly is further provided with a degassing hole traversing the core and overmolding from the blind axial hole to an axial outer cylindrical surface. The degassing hole is formed in the magnetic core. The degassing hole has a restriction arranged in a first proximal section of the blind axial hole. The first section has a first diameter D62, a first length L62 with the following characteristics:
1 <L62/D62 < 8, de préférence 6.  1 <L62 / D62 <8, preferably 6.
Le trou de dégazage présente un deuxième tronçon avec un deuxième diamètre D64 à une extrémité proximale d'un circuit de retour et une deuxième longueur L64: The degassing hole has a second section with a second diameter D64 at a proximal end of a return circuit and a second length L64:
-0,06<D62/D64 < 0,02, de préférence D62/D64 = 0,04  -0.06 <D62 / D64 <0.02, preferably D62 / D64 = 0.04
-0,2<L62/L64<0,3, de préférence L62/L64 = 0,15.  -0.2 <L62 / L64 <0.3, preferably L62 / L64 = 0.15.
Le trou de dégazage est disposé proximale à l'extrémité distale du trou borgne axial.  The degassing hole is disposed proximal to the distal end of the axial blind hole.
Le trou de dégazage est proximal à la première face du bobinage. The degassing hole is proximal to the first face of the coil.
De plus un diamètre D50b du trou borgne est inférieur à un diamètre moyen D50a du trou borgne axial dans lequel communique le premier tronçon du trou de dégazage calibré. Le trou de dégazage fait un angle avec l'axe principal compris entre 80 degrés et 120 degrés. L'angle peut être de 90 °. In addition a diameter D50b of the blind hole is smaller than a mean diameter D50a of the axial blind hole in which communicates the first section of the calibrated degassing hole. The degassing hole makes an angle with the main axis between 80 degrees and 120 degrees. The angle can be 90 °.
De plus un actionneur de l'injecteur de carburant comprend l'ensemble de bobine telle que décrit précédemment. En outre un injecteur de carburant comprend l'actionneur telle que décrit précédemment.  In addition, an actuator of the fuel injector comprises the coil assembly as previously described. In addition, a fuel injector comprises the actuator as described above.
Un procédé de fabrication de procédé d'un ensemble de bobine telle que décrit précédemment comprend les étapes suivantes:  A method of process fabrication of a coil assembly as previously described comprises the following steps:
-enroulement du fil électrique sur un sous-ensemble puis;  winding the electrical wire on a subassembly then;
- enroulement du fil à une extrémité des bornes, puis;  winding the wire at one end of the terminals, then;
- mise en place des cabochons sur l'extrémité inférieure des bornes et soudage des cabochons puis;  - setting up the cabochons on the lower end of the terminals and welding the cabochons then;
- surmoulage de l'ensemble de bobine et ensuite;  over-molding the coil assembly and then;
-réaliser le premier tronçon du trou de dégazage dans le noyau magnétique puis ;  -realizing the first section of the degassing hole in the magnetic core then;
-réaliser le deuxième tronçon du trou de dégazage dans le surmoulage de l'ensemble de bobine.  -realizing the second section of the degassing hole in the overmolding of the coil assembly.
Le trou de dégazage peut être réalisé par l'utilisation d'une pièce rapportée au cours du surmoulage du fil.  The degassing hole can be achieved by the use of an insert during overmolding of the wire.
BREVE DESCRIPTION DES DESSINS BRIEF 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:  Other features, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given by way of non-limiting example:
Figure 1 est une coupe partielle d'un injecteur Figure 1 is a partial section of an injector
Figure 2 est une vue isométrique d'un sous ensemble de bobine.  Figure 2 is an isometric view of a coil subassembly.
Figure 3 est une vue isométrique d'un ensemble de bobine Figure 3 is an isometric view of a coil assembly
Figure 4 est une coupe du trou de dégazage DESCRIPTION DES MODES DE REALISATION PRÉFÉRÉS Figure 4 is a section of the degassing hole DESCRIPTION OF THE PREFERRED EMBODIMENTS
Pour faciliter et clarifier la description qui suit, l'orientation de haut en bas est choisi arbitrairement et, les mots et expressions tels que "ci-dessus, dessous, dessus, dessous, haut, bas ..." peuvent être utilisés sans aucune intention de limiter l'invention. To facilitate and clarify the description that follows, the high orientation in bottom is chosen arbitrarily and, words and phrases such as "above, below, above, below, up, down ..." may be used without any intention to limit the invention.
L'injecteur 10 s'étend selon un axe longitudinal X et comprend de bas en haut, selon le sens conventionnel et non limitatif des figures, un ensemble de buse 12 comprenant un élément de vanne 14 ou communément appelé aiguille 14 agencée dans un corps de buse 16, une tige de commande 34 agencé dans un corps de vanne 20, un actionneur 22 agencé dans un corps d'actionneur 24. L'aiguille 14 est agencée axialement coulissante dans un alésage 26 cylindrique longitudinal du corps de buse entre une position fermée dans laquelle l'aiguille 14 est en contact avec un siège de corps de buse (non représenté) et une position ouverte où l'aiguille 14 est écarté du siège (non représenté).  The injector 10 extends along a longitudinal axis X and comprises from bottom to top, in the conventional and nonlimiting sense of the figures, a nozzle assembly 12 comprising a valve element 14 or commonly called a needle 14 arranged in a body of nozzle 16, a control rod 34 arranged in a valve body 20, an actuator 22 arranged in an actuator body 24. The needle 14 is arranged axially sliding in a longitudinal cylindrical bore 26 of the nozzle body between a closed position wherein the needle 14 is in contact with a nozzle body seat (not shown) and an open position where the needle 14 is spaced from the seat (not shown).
Comme décrit dans la figure 1, l'injecteur 10 est pourvu d'un circuit de circulation de carburant qui permet d'amener du carburant haute pression via un circuit haute pression depuis un orifice d'entrée agencé dans une partie haute de l'injecteur 10 jusqu'aux trous d'injection (non représentés) agencés dans une partie basse de l'injecteur 10.  As described in FIG. 1, the injector 10 is provided with a fuel circulation circuit which makes it possible to supply high pressure fuel via a high pressure circuit from an inlet orifice arranged in an upper part of the injector. 10 to the injection holes (not shown) arranged in a lower part of the injector 10.
Un premier mode de réalisation est maintenant décrit en référence aux figures 1, 2 et 3. L' actionneur électromagnétique 22 comprend un ensemble de bobine 28 électrique fixe, une armature magnétique mobile 30 fixé et solidaire d'un élément de soupape 31 est appelé communément tige de commande 34 se déplaçant vers l'ensemble de bobine 28 lorsque celle-ci est électriquement alimentée et un dispositif élastique 32 repoussant en permanence l'armature magnétique 30 vers une position éloignée de l'ensemble de bobine 28.  A first embodiment is now described with reference to FIGS. 1, 2 and 3. The electromagnetic actuator 22 comprises a set of fixed electrical coil 28, a movable magnetic armature 30 fixed and integral with a valve element 31 is commonly called control rod 34 moving towards the coil assembly 28 when it is electrically powered and an elastic device 32 permanently pushing the magnetic armature 30 to a position remote from the coil assembly 28.
L'ensemble de bobine 28 comprend un surmoulage cylindrique 42 et un sous ensemble de bobine 43 comprenant deux extrémités 36, un noyau 38 et un bobinage 40 enroulé autour du noyau 38. Les deux extrémités 36 s'étendent le long de l'axe principal X vers une extrémité supérieure du sous ensemble 43. Le bobinage 40 est surmoulé formant le surmoulage cylindrique 42. Le bobinage 40 s'étend axialement à partir d'une première face transverse 46 se prolongeant axialement jusqu'à une seconde surface 48. L'ensemble de bobine surmoulé 28 comprend de plus un trou borgne axial 50 s 'étendant vers l'intérieur de l'ensemble de bobine 28 à partir d'une première extrémité 51 à une deuxième extrémité 52. Le trou borgne 50 est adapté pour loger au moins deux ressorts 54,56 pour solliciter l'armature magnétique 30. L'ensemble de bobine 28 est en outre muni d'un trou de dégazage 58 traversant le surmoulage 42 à partir du trou axial borgne 50 à une surface cylindrique externe axiale 60. Le trou de dégazage 58 présente une restriction agencée dans un premier tronçon 62 proximal du trou axial borgne 50. La restriction est une réduction du diamètre du trou telle que placé dans le passage du fluide en mouvement il limite son débit ou modifie la pression dans la première portion 62 du trou de dégazage. La restriction produit également des pertes de charge nécessaires du fluide sous pression dans un circuit de retour de fuite 61. The coil assembly 28 comprises a cylindrical overmolding 42 and a coil subassembly 43 comprising two ends 36, a core 38 and a coil 40 wound around the core 38. Both ends 36 extend along the main axis X to an upper end of the subassembly 43. The coil 40 is overmolded forming the cylindrical overmolding 42. The coil 40 extends axially from a first transverse face 46 extending axially to a second surface 48. overmolded coil assembly 28 further includes an axial blind hole 50 extending inwardly of the coil assembly 28 from a first end 51 to a second end 52. The blind hole 50 is adapted to accommodate at least two springs 54, 56 for biasing the magnetic armature 30. The coil assembly 28 is further provided with a degassing hole 58 passing through the overmolding 42 from the blind axial hole 50 at an axial outer cylindrical surface 60. The degassing hole 58 has a restriction arranged in a first section 62 proximal of the blind axial hole 50. The restriction is a reduction in the diameter of the hole as placed in the passage of the fluid in movement it limits its flow or changes the pressure in the first portion 62 of the degassing hole. The restriction also produces the necessary pressure drops of the fluid under pressure in a leakage return circuit 61.
Le trou de dégazage 58 présente un premier tronçon 62 ayant un premier diamètre D62, une première longueur L62 avec pour caractéristiques :  The degassing hole 58 has a first section 62 having a first diameter D62, a first length L62 with the following characteristics:
1 <L62/D62 < 8, de préférence 6.  1 <L62 / D62 <8, preferably 6.
Le choix de ces dimensions permet de réduire complètement les ondes de retour du fluide dans le trou borgne axial 50. The choice of these dimensions makes it possible to completely reduce the return waves of the fluid in the axial blind hole 50.
Le trou de dégazage 58 présente un deuxième tronçon 64 avec un deuxième diamètre D64 compris entre le premier tronçon 62 et la surface extérieure transverse 60 proximale du circuit de retour de fuite 61 et une deuxième longueur L64:  The degassing hole 58 has a second section 64 with a second diameter D64 between the first section 62 and the transverse outer surface 60 of the leakage return circuit 61 and a second length L64:
- 0,06<D62/D64 < 0,02, de préférence D62/D64 = 0,04 ;  0.06 <D62 / D64 <0.02, preferably D62 / D64 = 0.04;
- 0,2<L62/L64<0,3, de préférence L62/L64 = 0,15.  0.2 <L62 / L64 <0.3, preferably L62 / L64 = 0.15.
De même le choix des dimensions des deux tronçons 62,64 permet un écoulement moins turbulent vers le circuit de retour de fuite 61. Likewise, the choice of the dimensions of the two sections 62, 64 allows a less turbulent flow towards the leakage return circuit 61.
Le trou de dégazage 58 est disposé proximal à la deuxième extrémité 52 distale. Dans d'autres alternatives non représentées le trou de dégazage 58 peut être proximal à la première extrémité 51 du trou borgne. Le trou de dégazage 58 fait un angle de 90 ° avec l'axe principal X. Dans une alternative au mode de réalisation non représenté, le trou de dégazage 58 peut faire un angle compris entre 80 degrés et 120 degrés avec l'axe principal X. The degassing hole 58 is disposed proximal to the distal second end 52. In other alternatives not shown the degassing hole 58 may be proximal to the first end 51 of the blind hole. The degassing hole 58 makes an angle of 90 ° with the main axis X. In an alternative to the embodiment not shown, the degassing hole 58 can make an angle of between 80 degrees and 120 degrees with the main axis X .
Le trou borgne 50 s'étend le long de l'axe longitudinal X. le trou borgne 50 présente un premier diamètre D50a et un deuxième diamètre D50b. Le premier diamètre D50a est la valeur moyenne du diamètre du trou 50. Le deuxième diamètre D50b est inférieur au premier diamètre moyen D50a du trou. Le dispositif élastique 32 comprend deux ressorts hélicoïdaux 54, 56 séparés par un membre séparateur 66 ou pion 66. Dans d'autres alternatives le dispositif élastique 66 peut comprendre un seul ressort 54, 56. Le dispositif élastique 32 est agencé dans le trou borgne axial 50. Selon la figure 1, le premier ressort 54 est comprimé entre une première face 68 du pion 66 et la deuxième extrémité 52 du trou. Le deuxième ressort 56 est comprimé entre la deuxième face 69 du pion et l'armature électrique 30. The blind hole 50 extends along the longitudinal axis X. The blind hole 50 has a first diameter D50a and a second diameter D50b. The first diameter D50a is the average value of the diameter of the hole 50. The second diameter D50b is smaller than the first average diameter D50a of the hole. The elastic device 32 comprises two helical springs 54, 56 separated by a separator member 66 or pin 66. In other alternatives the elastic device 66 may comprise a single spring 54, 56. The elastic device 32 is arranged in the axial blind hole 50. According to Figure 1, the first spring 54 is compressed between a first face 68 of the pin 66 and the second end 52 of the hole. The second spring 56 is compressed between the second face 69 of the pin and the electric armature 30.
Le procédé de fabrication de l'ensemble de bobine 28 comprend les étapes suivantes:  The method of manufacturing the coil assembly 28 comprises the following steps:
- enroulement du fil électrique 44 sur un sous-ensemble 43 puis;  winding of the electric wire 44 on a subassembly 43 then;
- enroulement du fil 44 à une extrémité des bornes 36, puis;  winding the wire 44 at one end of the terminals 36, then;
- mise en place des cabochons 74 sur l'extrémité inférieure des bornes 34 et le soudage des cabochons 74 puis;  - Setting up the cabochons 74 on the lower end of the terminals 34 and welding the cabochons 74 then;
- Surmoulage de l'ensemble de bobine 28 et ensuite;  Overmolding the coil assembly 28 and then;
-réaliser le premier tronçon 62 du trou de dégazage 58 dans le noyau magnétique 38 puis ;  -realizing the first section 62 of the degassing hole 58 in the magnetic core 38 and;
-réaliser le deuxième tronçon 64 du trou de dégazage dans le surmoulage 42 de l'ensemble de bobine 28.  realizing the second section 64 of the degassing hole in the overmoulding 42 of the coil assembly 28.
Le trou de dégazage 58 calibré est ainsi ménagé dans la partie magnétique(38). Le trou de dégazage 58 peut être réalisé par technologie laser ou par tous autres moyens. La forme du trou de dégazage 58 peut être ronde, carrée ou conique ou tout autre formes.  The calibrated degassing hole 58 is thus formed in the magnetic part (38). The degassing hole 58 may be made by laser technology or by any other means. The shape of the degassing hole 58 may be round, square or conical or any other shape.
Dans ce chapitre nous allons décrire le fonctionnement de l'injecteur 10. In this chapter we will describe the operation of the injector 10.
Comme décrit dans la figure 1, lorsque l'actionneur 22 est électriquement alimenté les deux ressorts 54, 56 de l'actionneur sont comprimés par la pression sollicitée par l'armature 30, ainsi que la pression dans le trou axial borgne 50 augmente. Au cours de la phase d'ouverture de la tige de commande 34, les longueurs des ressorts 54, 56 sont réduites de sorte que le volume du trou axialAs described in Figure 1, when the actuator 22 is electrically powered the two springs 54, 56 of the actuator are compressed by the pressure urged by the armature 30, and the pressure in the blind axial hole 50 increases. During the opening phase of the control rod 34, the lengths of the springs 54, 56 are reduced so that the volume of the axial hole
50 est réduite de sorte que la pression augmente. L'armature 30, se déplaçant vers le haut, pousse le fluide dans le trou borgne axial 50 et l'onde créée dans le fluide se déplace vers le bas vers l'armature 30. L'onde créée dans le fluide perturbe alors la tige de commande 34. La surpression dans le trou axial 50 est supprimée par le trou de dégazage 58 qui est communication de fluide avec le trou borgne axial 50 par le premier tronçon 62 du trou de dégazage et par le deuxième tronçon 64 agencé dans le prolongement du premier tronçon 62 et compris entre le premier tronçon 62 et une zone de basse pression qui communique avec le circuit de retour de fuite 61. 50 is reduced so that the pressure increases. The armature 30, moving upwards, pushes the fluid into the axial blind hole 50 and the wave created in the fluid moves down towards the armature 30. The wave created in the fluid then disturbs the rod 34. The overpressure in the axial hole 50 is suppressed by the degassing hole 58 which is fluid communication with the axial blind hole 50 through the first section 62 of the degassing hole and the second section 64 arranged in the extension of the first section 62 and between the first section 62 and a low pressure zone which communicates with the leakage return circuit 61 .
Les références suivantes ont été utilisées dans la description The following references were used in the description
10 injecteur  10 injector
12 ensemble de buse  12 nozzle assembly
14 aiguille  14 needle
16 corps de buse  16 nozzle body
20 corps de vanne  20 valve bodies
22 actionneur  22 actuator
24 corps d'actonneur  24 body of the actor
26 trou borgne  26 one-eyed hole
28 ensemble de bobine  28 coil set
30 armature  30 frame
31 élément de soupape  31 valve element
32 dispositif élastique  32 elastic device
34 tige de commande  34 control rod
36 extrémité  36 end
38 noyau  38 core
40 bobinage  40 winding
42 surmoulage  42 overmolding
43 sous ensemble de bobinage  43 under winding set
44 fils de bobinage  44 winding wires
46 première surface du bobinage  46 first winding surface
48 deuxième surface du bobinage  48 second winding surface
50 trou borgne axial  50 axial blind hole
51 première extrémité  51 first end
52 deuxième extrémité  52 second end
54 premier ressort  54 first spring
56 deuxième ressort  56 second spring
58 trou de dégazage  58 degassing hole
60 surface extérieure transverse  60 transverse outer surface
61 circuit de retour  61 return circuit
62 premier tronçon  62 first stretch
64 deuxième tronçon  64 second section
66 membre séparateur/pion  66 separating member / pawn
68 première face du pion  68 first face of the pawn
69 deuxième face du pion  69 second face of the pawn
74 cabochon  74 cabochon
X axe longitudinal  X longitudinal axis

Claims

REVENDICATIONS: CLAIMS:
1. Ensemble de bobine (28) d'un actionneur électromagnétique (22) dans un injecteur de carburant (10), l'ensemble de bobine (28), comprenant: A coil assembly (28) of an electromagnetic actuator (22) in a fuel injector (10), the coil assembly (28), comprising:
- Un noyau magnétique (38) s'étendant le long d'un axe principal (X), A magnetic core (38) extending along a main axis (X),
- Une bobinage (40) enroulé autour du noyau (38), le bobinage (40) étant surmoulé formant un surmoulage cylindrique (42), et s'étendant axialement à partir d'une première face transverse (46) jusqu'à une seconde surface (48) , et- A coil (40) wound around the core (38), the coil (40) being overmolded forming a cylindrical overmoulding (42), and extending axially from a first transverse face (46) to a second surface (48), and
- L'ensemble de bobine surmoulé (28) comprenant de plus un trou borgne axial (50) s'étendant vers l'intérieur de l'ensemble de bobine (28) à partir de la première surface (51) à une extrémité distale (52), le trou borgne (50) étant adapté pour loger au moins un ressort (54, 56) pour solliciter une armature magnétique (30); - The overmoulded coil assembly (28) further comprising an axial blind hole (50) extending inwardly of the coil assembly (28) from the first surface (51) at a distal end ( 52), the blind hole (50) being adapted to accommodate at least one spring (54, 56) for biasing a magnetic armature (30);
caractérisé en ce que l'ensemble de bobine (28) est en outre muni d'un trou de dégazage (58) traversant le noyau (38) et le surmoulage (42) à partir du trou axial borgne (50) jusqu'à une surface cylindrique externe axiale (60), le trou de dégazage (58) ménagé dans le noyau magnétique (38) et présentant une restriction agencée dans un premier tronçon (62) proximal du trou axial borgne (50) et dans lequel le premier tronçon (62) présente un premier diamètre D62, une première longueur L62 avec pour caractéristiques : characterized in that the coil assembly (28) is further provided with a degassing hole (58) extending through the core (38) and overmoulding (42) from the blind axial hole (50) to a axial outer cylindrical surface (60), the degassing hole (58) formed in the magnetic core (38) and having a restriction arranged in a first section (62) proximal to the blind axial hole (50) and wherein the first section ( 62) has a first diameter D62, a first length L62 with characteristics:
1 <L62/D62 < 8, de préférence 6. 1 <L62 / D62 <8, preferably 6.
2. Ensemble de bobine (28) selon la revendication précédente, dans lequel le trou de dégazage (58) présente un deuxième tronçon (64) avec un deuxième diamètre2. coil assembly (28) according to the preceding claim, wherein the degassing hole (58) has a second section (64) with a second diameter
D64 à une extrémité (60) proximale d'un circuit de retour (61) et une deuxième longueur L64: D64 at a proximal end (60) of a return circuit (61) and a second length L64:
-0,06<D62/D64 < 0,02, de préférence D62/D64 = 0,04 -0.06 <D62 / D64 <0.02, preferably D62 / D64 = 0.04
-0,2<L62/L64<0,3, de préférence L62/L64 = 0,15. -0.2 <L62 / L64 <0.3, preferably L62 / L64 = 0.15.
3. Ensemble de bobine (28) selon l'une quelconque des revendications précédentes, dans lequel le trou de dégazage (58) est disposé proximal à l'extrémité distale (52) du trou borgne axial. The coil assembly (28) of any preceding claim, wherein the degassing hole (58) is disposed proximal to the distal end (52) of the axial blind hole.
4. Ensemble de bobine (28) selon l'une quelconque des revendications précédentes, dans lequel un diamètre D50b du trou borgne (50) est inférieur à un diamètre moyen D50a du trou borgne axial dans lequel communique le premier tronçon (62) du trou de dégazage calibré. A coil assembly (28) according to any one of the preceding claims, wherein a diameter D50b of the blind hole (50) is smaller than an average diameter D50a of the axial blind hole in which the first section (62) of the hole communicates. calibrated degassing.
5. Ensemble de bobine (28) selon l'une quelconque des revendications précédentes, dans lequel le trou de dégazage (58) fait un angle avec l'axe principal compris entre 80 degrés et 120 degrés. A coil assembly (28) according to any one of the preceding claims, wherein the degassing hole (58) is at an angle to the major axis of between 80 degrees and 120 degrees.
6. Ensemble de bobine (28) selon la revendication 5, dans lequel l'angle est de 90 °. The spool assembly (28) of claim 5, wherein the angle is 90 °.
7. Actionneur (22) de l'injecteur de carburant (10) comprenant l'ensemble de bobine (28) selon l'une quelconque des revendications précédentes. An actuator (22) of the fuel injector (10) comprising the coil assembly (28) according to any one of the preceding claims.
8. Injecteur de carburant (10) comprenant l'actionneur (22) selon la revendication 7. A fuel injector (10) comprising the actuator (22) according to claim 7.
9. Procédé de fabrication de procédé d'un ensemble de bobine (28) tel que défini dans l'une quelconque des revendications précédentes, comprenant les étapes suivantes: A process method of a coil assembly (28) as defined in any one of the preceding claims, comprising the steps of:
-enroulement du fil électrique (44) sur un sous-ensemble (43) puis;  winding the electric wire (44) onto a subassembly (43) then;
- enroulement du fil (44) à une extrémité des bornes (36), puis;  winding the wire (44) at one end of the terminals (36), then;
- mise en place des cabochons (74) sur l'extrémité inférieure des bornes (74) et soudage des cabochons (74) puis;  - Setting up the cabochons (74) on the lower end of the terminals (74) and welding the cabochons (74) then;
- surmoulage de l'ensemble de bobine (28) et ensuite;  over-molding of the coil assembly (28) and then;
-réaliser le premier tronçon (62) du trou de dégazage (58) dans le noyau magnétique 38 puis ; -réaliser le deuxième tronçon (64) du trou de dégazage dans le surmoulage (42) de l'ensemble de bobine (44). -realizing the first section (62) of the degassing hole (58) in the magnetic core 38 and; and making the second section (64) of the degassing hole in the over-molding (42) of the coil assembly (44).
10. Procédé tel que défini dans la revendication 9, dans lequel le trou de dégazage (58) est réalisé par l'utilisation d'une pièce rapportée au cours du surmoulage du fil. 10. The method as defined in claim 9, wherein the degassing hole (58) is made by use of an insert during overmolding of the wire.
EP17752157.2A 2016-09-01 2017-08-21 Coil assembly Active EP3507482B1 (en)

Applications Claiming Priority (2)

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FR1658148A FR3055370B1 (en) 2016-09-01 2016-09-01 COIL ASSEMBLY
PCT/EP2017/071046 WO2018041656A1 (en) 2016-09-01 2017-08-21 Coil assembly

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EP3507482B1 EP3507482B1 (en) 2020-07-22

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KR (1) KR102337017B1 (en)
CN (1) CN109790805B (en)
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EP3507482B1 (en) 2020-07-22
CN109790805B (en) 2021-03-16
FR3055370B1 (en) 2020-05-01
KR102337017B1 (en) 2021-12-09
US10995715B2 (en) 2021-05-04
CN109790805A (en) 2019-05-21
FR3055370A1 (en) 2018-03-02
WO2018041656A1 (en) 2018-03-08
US20190242344A1 (en) 2019-08-08

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