EP0051009B1 - Electromagnetic ball valve injector - Google Patents

Electromagnetic ball valve injector Download PDF

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Publication number
EP0051009B1
EP0051009B1 EP81401580A EP81401580A EP0051009B1 EP 0051009 B1 EP0051009 B1 EP 0051009B1 EP 81401580 A EP81401580 A EP 81401580A EP 81401580 A EP81401580 A EP 81401580A EP 0051009 B1 EP0051009 B1 EP 0051009B1
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EP
European Patent Office
Prior art keywords
ball
seat
core
injector
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81401580A
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German (de)
French (fr)
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EP0051009A1 (en
Inventor
Jacques Lecomte
Antonio Moretti
Pierre Bouthors
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Regie Nationale des Usines Renault
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Regie Nationale des Usines Renault
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Publication date
Application filed by Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
Priority to AT81401580T priority Critical patent/ATE11070T1/en
Publication of EP0051009A1 publication Critical patent/EP0051009A1/en
Application granted granted Critical
Publication of EP0051009B1 publication Critical patent/EP0051009B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0632—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a spherically or partly spherically shaped armature, e.g. acting as valve body
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • the manufacture of the pellet is much easier and more economical than the machining of the ends of the cores of the previous solutions.
  • the return spring then rests under a flange of the patch, the latter being applied directly to a smooth face of the soft iron core.

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

Abstract

An electromagnetically actuated injector, for the injection of fluid in internal combustion engines in particular, comprises a casing, a core located within the casing, an actuating coil surrounding the core, a fluid inlet passage, a chamber between the core and a cover. The injector contains a ball which cooperates with a seat to close the injection passage formed in the cover, said ball being attracted by the actuating coil against an elastic system mounted in front of the core and which urges the ball against its seat. The injector includes a disk interposed between the core and the ball, the disk surface facing the ball being coated with a thin layer of nonmagnetic material, a seat with a circular working surface, a funnel-shaped nozzle for automatic fluid-flow regulation, and an injection tip provided with spiral inclines to create a cone-shaped spray at the outlet of the injection nozzle. Application is to fuel injection in the internal combustion engines of automotive vehicles.

Description

La présente invention se rapporte à un injecteur à bille à commande électromagnétique, destiné à assurer l'injection de fluide, notamment de carburant dans les moteurs à combustion interne.The present invention relates to a ball injector with electromagnetic control, intended to ensure the injection of fluid, in particular fuel into internal combustion engines.

Un injecteur de ce type a déjà été décrit dans le brevet FR-A-2 166 734 et dans son addition n° 2211049.An injector of this type has already been described in patent FR-A-2,166,734 and in its addition No. 2211049.

On y décrit notamment un injecteur à commande électromagnétique pour l'injection de fluide notamment dans les moteurs à combustion interne, du type comprenant une cuirasse, un noyau logé à l'intérieur de la cuirasse, une bobine d'excitation entourant le noyau, un conduit d'arrivée de fluide, un logement compris entre couvercle et le noyau et dans lequel est prévue une bille d'obturation, par l'intermédiaire d'un siège, du conduit d'injection ménagé dans le couvercle, cette bille étant sollicitée par la bobine d'excitation à l'encontre d'un système élastique monté à l'avant du noyau et qui tend à repousser la bille contre son siège et une mince couche de métal non magnétique étant interposée entre le noyau et la bille. Dans cette réalisation, il est nécessaire d'usiner l'extrémité du noyau pour y loger, d'une part, le système élastique qui peut être un simple ressort hélicoïdal et, d'autre part, une pièce rapportée en matériau non magnétique pour éviter le collage la bille contre le noyau par magnétisme rémanent. Ces usinages ne présentent pas de difficultés particulières, mais ils augmentent notablement les coûts de fabrication de l'injecteur.It describes in particular an electromagnetically controlled injector for injecting fluid, especially in internal combustion engines, of the type comprising a breastplate, a core housed inside the breastplate, an excitation coil surrounding the core, a fluid inlet duct, a housing included between the cover and the core and in which a sealing ball is provided, by means of a seat, of the injection duct formed in the cover, this ball being urged by the excitation coil against an elastic system mounted at the front of the core and which tends to push the ball against its seat and a thin layer of non-magnetic metal being interposed between the core and the ball. In this embodiment, it is necessary to machine the end of the core to accommodate, on the one hand, the elastic system which can be a simple helical spring and, on the other hand, an insert made of non-magnetic material to avoid bonding the ball against the core by remanent magnetism. These machining operations do not present any particular difficulties, but they considerably increase the manufacturing costs of the injector.

Par ailleurs, malgré la force de rappel du ressort, l'étanchéité de la bille sur son siège n'est pas toujours réalisée avec une efficacité suffisante.Furthermore, despite the return force of the spring, the sealing of the ball on its seat is not always carried out with sufficient efficiency.

Enfin, il se produit des turbulences liées à des phénomènes de cavitation qui ont lieu habituellement sous le siège de l'injecteur lorsque le fluide atteint une température où il commence à se vaporiser. Le débit dans le conduit d'injection se trouve alors modifié en fonction de la température.Finally, turbulence occurs due to cavitation phenomena which usually take place under the seat of the injector when the fluid reaches a temperature where it begins to vaporize. The flow in the injection pipe is then modified as a function of the temperature.

Par ailleurs, le brevet US-A-3 731 880 décrit un injecteur à commande électromagnétique comportant un siège pour une bille d'obturation, réalisé en matière non magnétique. Ce siège présente une portée adaptée aux caractéristiques dimensionnelles de la bille et est muni d'une buse autorégulatrice de débit du fluide, à profil en forme d'entonnoir. Toutefois, cet injecteur ne permet pas de résoudre le problème du collage de la bille contre le noyau par magnétisme rémanent.Furthermore, US-A-3,731,880 describes an electromagnetic-controlled injector comprising a seat for a sealing ball, made of non-magnetic material. This seat has a range adapted to the dimensional characteristics of the ball and is provided with a self-regulating fluid flow nozzle, with a funnel-shaped profile. However, this injector does not solve the problem of sticking of the ball against the core by remanent magnetism.

Le but de la présente invention est d'éviter les principaux inconvénients ci-dessus mentionnés et de réaliser un injecteur à bille perfectionné du type décrit au brevet FR-A-2 166 736 que soit de fabrication plus facile et plus économique tout en améliorant ses caractéristiques de fonctionnement, notamment de débit et d'étanchéité.The object of the present invention is to avoid the main drawbacks mentioned above and to produce an improved ball injector of the type described in patent FR-A-2 166 736 that is easier and more economical to manufacture while improving its operating characteristics, in particular of flow and sealing.

Ce résultat est obtenu au moyen d'un injecteur du type précité, caractérisé en ce que la mince couche de métal non magnétique est constituée par un dépôt sur la face orientée vers la bille d'une pastille pleine en matériau magnétique, sollicitée contre le noyau par le système élastique, en ce que le siège, réalisé en métal non magnétique de grande dureté, présente une portée sphérique adaptée aux caractéristiques dimensionnelles de la bille et en ce que le siège loge en aval dela portée sphérique une buse autorégulatrice de débit de fluide, à profil en forme d'entonnoir se rétrécissant en direction de courant.This result is obtained by means of an injector of the aforementioned type, characterized in that the thin layer of non-magnetic metal consists of a deposit on the face facing the ball of a solid pellet of magnetic material, urged against the core by the elastic system, in that the seat, made of non-magnetic metal of high hardness, has a spherical bearing adapted to the dimensional characteristics of the ball and in that the seat accommodates downstream of the spherical bearing a self-regulating fluid flow nozzle , with funnel-shaped profile narrowing in the direction of the current.

La fabrication de la pastille est beaucoup plus aisée et plus économique que l'usinage des extrémités des noyaux des solutions antérieures. Le ressort de rappel repose alors sous une collerette de la pastille, cette dernière étant appliquée directement sur une face lisse du noyau en fer doux.The manufacture of the pellet is much easier and more economical than the machining of the ends of the cores of the previous solutions. The return spring then rests under a flange of the patch, the latter being applied directly to a smooth face of the soft iron core.

Le siège, également en matériau d'une très grande dureté, peut être usiné par différents procédés pour obtenir une portée sphérique assurant une étanchéité parfaite avec la bille. De préférence, on réalise cette portée par matriçage du siège directement avec une bille de mêmes caractéristiques dimensionnelles.The seat, also made of very hard material, can be machined by different processes to obtain a spherical seat ensuring perfect sealing with the ball. Preferably, this range is achieved by stamping the seat directly with a ball of the same dimensional characteristics.

La buse est en forme d'entonnoir, dont le profil est déterminé de façon empirique et permet un écoulement du fluide sans décollement aux parois quelle que soit la température, ce qui évite les turbulences et assure un débit constant et autorégulé.The nozzle is funnel-shaped, the profile of which is determined empirically and allows the fluid to flow without detachment from the walls whatever the temperature, which avoids turbulence and ensures a constant and self-regulating flow.

D'autres avantages et particularités apparaîtront dans la description qui suit de plusieurs modes et variantes de réalisation de l'invention, en référence au dessin annexé sur lequel:Other advantages and particularities will appear in the following description of several embodiments and variants of the invention, with reference to the appended drawing in which:

-La figure 1 représente en coupe un injecteur à alimentation par le noyau, équipé de certains perfectionnements selon l'invention,

  • - la figure 2 est un vue agrandie de la bille d'obturation sur son siège,
  • - la figure 3 est une coupe partielle selon la ligne III de la figure 1,
  • - la figure 4 est un second mode de réalisation à alimentation latérale par le nez de l'injecteur.
FIG. 1 represents in section an injector powered by the core, equipped with certain improvements according to the invention,
  • FIG. 2 is an enlarged view of the shutter ball on its seat,
  • FIG. 3 is a partial section along line III of FIG. 1,
  • - Figure 4 is a second embodiment with lateral supply through the nose of the injector.

On reconnaît sur la figure 1 un injecteur du type déjà décrit dans les brevets antérieurs précités et comprenant un boîtier en matériau magnétique dont une première partie forme la cuirasse 1, une deuxième partie forme le noyau 2 d'un électro-aimant et une troisième partie forme le couvercle 3 se terminant par le nez d'injection 4. Le noyau peut être réalisé dans la même masse que la cuirasse (figure 1), le couvercle 3 étant immobilisé sur la cuirasse par tout moyen d'assemblage connu, par exemple des goupilles 5, ou bien être rapporté directement sur le noyau par tout moyen d'assemblage, par exemple par vissage 6 (figure 4), le couvercle 3 faisant alors partie intégrante de la cuirasse 1.We recognize in Figure 1 an injector of the type already described in the aforementioned prior patents and comprising a housing of magnetic material of which a first part forms the breastplate 1, a second part forms the core 2 of an electromagnet and a third part forms the cover 3 ending with the injection nose 4. The core can be produced in the same mass as the breastplate (FIG. 1), the cover 3 being immobilized on the breastplate by any known means of assembly, for example pins 5, or be attached directly to the core by any assembly means, for example by screwing 6 (FIG. 4), the cover 3 then forming an integral part of the breastplate 1.

Dans la réalisation de la figure 1, l'alimentation du fluide se fait par l'intermédiaire de conduits 7, 8 traversant le noyau tandis que, sur la figure 4, le noyau 2 étant massif, l'alimentation du fluide est réalisée latéralement au niveau du nez 4 de l'injecteur, à travers un conduit 9 traversant le conduit d'admission 10 du moteur à combustion interne, pour des raisons qui seront expliquées par la suite.In the embodiment of FIG. 1, the supply of the fluid takes place via conduits 7, 8 passing through the core while, in FIG. 4, the core 2 being solid, the fluid is supplied laterally at the level of the nose 4 of the injector, through a conduit 9 passing through the intake conduit 10 of the internal combustion engine, for reasons which will be explained later.

Un logement 11 est formé dans le couvercle 3 pour y placer un clapet constitué d'une bille 12 en matériau magnétique poussée par un système élastique tel qu'un ressort hélicoïdal 13 contre un siège annulaire 14 en matériau non magnétique.A housing 11 is formed in the cover 3 to place a valve therein consisting of a ball 12 of magnetic material pushed by an elastic system such as a helical spring 13 against an annular seat 14 of non-magnetic material.

Sous l'action du champ magnétique créé par une bobine 15 alimentée en courant électrique par un conducteur d'amenée 16 et enroulée autor d'un support ou carcasse 17 de préférence en matière synthétique moulée, la bille 12 est appliquée contre l'extrémité du noyau 2, en opposition à la force de rappel du ressort 13, et le fluide s'écoule d'abord par un passage 18 prévu dans le logement (figure 3), puis à travers le siège 14 et par le conduit d'injection 19 traversant le nez et se terminant selon le cas par une buse d'injection 20 de forme et de caractéristiques appropriées au fonctionnement de l'injecteur, percée de un ou plusieurs orifices 21 de pulvérisation du fluide avec, éventuellement, un canal 22 de mise à la pression atmosphérique (figure 1).Under the action of the magnetic field created by a coil 15 supplied with electric current by a supply conductor 16 and wound automatically from a support or carcass 17 preferably made of molded synthetic material, the ball 12 is applied against the end of the core 2, in opposition to the return force of the spring 13, and the fluid flows first through a passage 18 provided in the housing (FIG. 3), then through the seat 14 and through the injection pipe 19 passing through the nose and ending, as the case may be, by an injection nozzle 20 of shape and characteristics suitable for the operation of the injector, pierced with one or more orifices 21 for spraying the fluid with, optionally, a channel 22 for setting atmospheric pressure (Figure 1).

L'étanchéité du circuit électrique par rapport au circuit fluidique est réalisée de façon connue, d'une part, au moyen d'une enveloppe synthétique 23 enrobant le bobinage et, d'autre part, par l'interposition de joints d'étanchéité 24, 25 comprimés entre la carcasse du bobinage et la cuirasse, le noyau ou le couvercle selon le montage adopté.The electrical circuit is sealed relative to the fluidic circuit in a known manner, on the one hand, by means of a synthetic envelope 23 coating the winding and, on the other hand, by the interposition of seals 24 , 25 tablets between the winding carcass and the breastplate, the core or the cover depending on the assembly adopted.

Le noyau pénétrant à l'intérieur de la carcasse du bobinage, la circulation du fluide, dans le cas d'une alimentation par le noyau, est facilitée par un conduit annulaire 26 réalisé par la différence des diamètres entre l'extrémité du noyau 2 et l'élargissement de l'alésage de la carcasse 17.The core penetrating inside the winding carcass, the circulation of the fluid, in the case of a supply by the core, is facilitated by an annular conduit 26 produced by the difference in diameters between the end of the core 2 and widening the bore of the carcass 17.

Conformément à une première caractéristique de l'invention (figure 2), on interpose une pastille pleine 27 en matériau magnétique de grande dureté entre le noyau 2 en fer doux et la bille 12, la face 28 de la pastille orientée vers la bille étant recouverte d'une couche mince de métal non magnétique pour éviter le collage avec la bille par effet magnétique rémanent.In accordance with a first characteristic of the invention (FIG. 2), a solid wafer 27 of magnetic material of high hardness is interposed between the core 2 of soft iron and the ball 12, the face 28 of the wafer oriented towards the ball being covered a thin layer of non-magnetic metal to prevent sticking with the ball by a residual magnetic effect.

La couche non magnétique peut être par exemple une couche de nickel déposée électro- lytiquement d'une épaisseur de préférence inférieure a 1/100e de mm. La grande dureté de l'acier employé pour la pastille permet d'éviter le matage provoqué par les attractions successives de la bille.The non-magnetic layer can be, for example, an electrolytically deposited nickel layer with a thickness preferably less than 1 / 100th of a mm. The high hardness of the steel used for the pellet avoids the matting caused by the successive attractions of the ball.

Le ressort de rappel 13 prend appui sous une collerette 29 de la pastille, cette dernière étant appliquée directement sur la face plane de l'extrémité du noyau 2.The return spring 13 is supported under a flange 29 of the patch, the latter being applied directly to the flat face of the end of the core 2.

Selon une autre caractéristique de l'invention, le siège annulaire 14, réalisé également en matériau non magnétique de grande dureté, présente une portée sphérique 30 adaptée aux caractéristiques dimensionnelles de la bille, portée qui peut être réalisée par tout moyen d'usinage connu mais de préférence par matriçage à froid. On obtient ainsi une étanchéité parfaite au moment de l'obturation du conduit d'injection par la bille.According to another characteristic of the invention, the annular seat 14, also made of non-magnetic material of great hardness, has a spherical bearing 30 adapted to the dimensional characteristics of the ball, bearing which can be produced by any known machining means but preferably by cold stamping. A perfect seal is thus obtained when the injection pipe is closed by the ball.

Selon une autre caractéristique, le siège 14 loge une buse 31 autorégulatrice de débit du fluide, à profil 32 en forme d'entonnoir, dont la géométrie déterminée de façon empirique peut être réalisée par différents procédés d'usinage mécaniques ou électromécaniques connus, sa finition étant obtenue de préférence par calibrage-matriçage. La buse 31 peut être rapportée à l'intérieur du siège 14 et, dans ce cas, les matériaux utilisés pour le siège et la buse peuvent être différents. On utilisera par exemple du laiton ou du bronze plus facile à travailler pour la buse, le siège restant en acier dur.According to another characteristic, the seat 14 houses a self-regulating fluid flow nozzle 31, with a profile 32 in the form of a funnel, the geometry of which is determined empirically and can be produced by various known mechanical or electromechanical machining processes, its finishing. being preferably obtained by calibration-stamping. The nozzle 31 can be attached to the inside of the seat 14 and, in this case, the materials used for the seat and the nozzle can be different. For example, brass or bronze, easier to work with, will be used for the nozzle, the seat remaining in hard steel.

La buse peut aussi être fabriquée dans la même pièce et donc avec le même métal que le siège.The nozzle can also be manufactured in the same part and therefore with the same metal as the seat.

Comme on l'a vu, le profil 32 de la buse permet de réguler le débit de fluide, c'est-à-dire de le rendre pratiquement indépendant de la température de l'injecteur. L'on sait, en effet, que des turbulences apparaissent sous le siège 14 de l'injecteur lorsque le fluide atteint une température où il commence à se vaporiser. La forme de la buse 31 empêche le décollement des veines de fluide sur les parois et supprime alors le phénomène de cavitation.As we have seen, the profile 32 of the nozzle makes it possible to regulate the fluid flow rate, that is to say to make it practically independent of the temperature of the injector. It is known, in fact, that turbulence appears under the seat 14 of the injector when the fluid reaches a temperature where it begins to vaporize. The shape of the nozzle 31 prevents the separation of the veins of fluid on the walls and therefore eliminates the phenomenon of cavitation.

Dans la variante de la figure 4 où l'injecteur est alimenté latéralement, outre la présence de la buse 31 autorégulatrice, il est possible de s'affranchir encore davantage des variations de température en créant une circulation du fluide d'alimentation 9 autor du nez 4 de l'injecteur, au niveau de la sortie de la buse 31, au moyen d'une chambre annulaire 33 ménagée entre le conduit d'admission 10 et le nez.In the variant of FIG. 4 where the injector is fed laterally, in addition to the presence of the self-regulating nozzle 31, it is possible to overcome even more temperature variations by creating a circulation of the supply fluid 9 autor of the nose 4 of the injector, at the outlet of the nozzle 31, by means of an annular chamber 33 formed between the intake duct 10 and the nose.

Cette réserve de fluide communique alors avec le logement 11 du clapet par un canal 34 percé dans le couvercle, le joint d'étanchéité 25 étant repoussé vers l'extérieur de l'axe de symétrie de l'injecteur et un autre joint 35 étant interposé entre le couvercle et le conduit d'admission.This reserve of fluid then communicates with the housing 11 of the valve by a channel 34 drilled in the cover, the seal 25 being pushed towards the outside of the axis of symmetry of the injector and another seal 35 being interposed between the cover and the intake duct.

Claims (5)

1. An electromagnetically controlled injector for injecting fluid in particular into internal combustion engines, of the type comprising a casing portion (1), a core portion (2) which is disposed within the casing portion, an energisation coil (15) around the core portion, a fluid intake conduit (7), a housing (11) which is disposed between a cover portion (3) and the core portion and in which there is disposed a closure ball (12) which, by means of a seat (14), closes off the injection conduit (19) provided in the cover portion, said ball being acted upon by the energisation coil against the force of a resilient system (13) which is mounted at the front of the core portion and which tends to urge the ball against its seat, and a thin layer of non-magnetic metall being interposed between the core portion (2) and the ball (12), characterised in that the thin layer of non-magnetic metal is formed by a deposit on the face (28) which is directed towards the ball of a solid pellet (27) of magnetic material, which is urged against the core portion by the resilient system (13), that the seat (14) which is made of very hard non-magnetic metal has a spherical bearing surface (30) adapted to the dimensional characteristics of the ball (12), and that the seat houses downstream of the spherical bearing surface a nozzle (31) which is self-regulating in respect of the flow of the fluid, being of a funnel-shaped configuration (32) which reduces in the direction of flow.
2. An injector according to claim 1 characterised in that the seat (14) and the nozzle (31) are made in one piece.
3. An injector according to either one of claims 1 and 2 characterised in that the cover portion (3) is extended on the injection side by a nose (4), the temperature of which is maintained at a constant value by the lateral feed (9) of the injector and by the circulation of the fluid within an annular chamber (33) provided between the intake conduit (10) and the injection nose (4).
4. An injector according to any one of claims 1 to 3 characterised in that the spherical bearing surface (30) of the seat (14) is produced by stamping.
5. An injector according to any one of claims 1 to 4 characterised in that finishing of the self-regulating nozzle (31) is produced by a calibration- stamping operation.
EP81401580A 1980-10-29 1981-10-13 Electromagnetic ball valve injector Expired EP0051009B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81401580T ATE11070T1 (en) 1980-10-29 1981-10-13 SOLENOID BALL INJECTION VALVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8023105 1980-10-29
FR8023105A FR2492894B1 (en) 1980-10-29 1980-10-29 BALL ELECTROMAGNETICALLY CONTROLLED INJECTOR

Publications (2)

Publication Number Publication Date
EP0051009A1 EP0051009A1 (en) 1982-05-05
EP0051009B1 true EP0051009B1 (en) 1985-01-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401580A Expired EP0051009B1 (en) 1980-10-29 1981-10-13 Electromagnetic ball valve injector

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US (1) US4427156A (en)
EP (1) EP0051009B1 (en)
JP (1) JPS57102555A (en)
AT (1) ATE11070T1 (en)
DE (1) DE3168069D1 (en)
FR (1) FR2492894B1 (en)

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Also Published As

Publication number Publication date
FR2492894B1 (en) 1985-06-07
DE3168069D1 (en) 1985-02-14
EP0051009A1 (en) 1982-05-05
FR2492894A1 (en) 1982-04-30
US4427156A (en) 1984-01-24
JPS57102555A (en) 1982-06-25
ATE11070T1 (en) 1985-01-15

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