FR2700224A1 - Anti-parasitic distributor cap for motor car - Google Patents

Anti-parasitic distributor cap for motor car Download PDF

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Publication number
FR2700224A1
FR2700224A1 FR9300080A FR9300080A FR2700224A1 FR 2700224 A1 FR2700224 A1 FR 2700224A1 FR 9300080 A FR9300080 A FR 9300080A FR 9300080 A FR9300080 A FR 9300080A FR 2700224 A1 FR2700224 A1 FR 2700224A1
Authority
FR
France
Prior art keywords
head
distributor
plastic
thermoplastic material
cap
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.)
Pending
Application number
FR9300080A
Other languages
French (fr)
Inventor
Heritier-Best Pierre
Coste Laurent
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.)
Sagem SA
Original Assignee
Sagem Allumage SA
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 Sagem Allumage SA filed Critical Sagem Allumage SA
Priority to FR9300080A priority Critical patent/FR2700224A1/en
Publication of FR2700224A1 publication Critical patent/FR2700224A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
    • F02P7/021—Mechanical distributors
    • F02P7/025—Mechanical distributors with noise suppression means specially adapted for the distributor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6598—Shield material
    • H01R13/6599—Dielectric material made conductive, e.g. plastic material coated with metal

Abstract

The distributor cap (1) is made up of a non-conducting plastic moulded inner (3) with flat base (4) coming into contact with the distributor (2). The cap has upper isolating pillars (5) for electrical connections.The cap is partially covered with a plastic conducting moulding (9) covering the base, to the top of the cap but leaving the upper surface open. A metal insert (8) ensures electrical connection of the outer to earth.

Description

PROCEDE DZANTIPARASITAGE ET TETE ANTIPARASITEE
DE DISTRIBUTEUR DE VEHICULE AUTONOBILE
La présente invention concerne un procédé d'antiparasitage et une tête antiparasitée de distributeur de véhicule automobile.DZANTIPARASITAGE PROCESS AND PEST CONTROL HEAD
OF AUTONOMOUS VEHICLE DISTRIBUTOR
The present invention relates to an anti-interference method and an anti-interference head of a motor vehicle distributor.

Les distributeurs sont, dans les véhicules automobiles, les organes visant à distribuer cycliquement aux différentes bougies d'allumage la haute tension destinée à former, entre les électrodes de ces bougies, l'étincelle provoquant l'inflammation des gaz combustibles dans les cylindres.Distributors are, in motor vehicles, the organs intended to distribute cyclically to the different spark plugs the high voltage intended to form, between the electrodes of these spark plugs, the spark causing the ignition of combustible gases in the cylinders.

Les têtes de ces distributeurs comportent un contact rotatif formant commutateur pour relier successivement à une source de haute tension les câbles d'alimentation des bougies. Des champs électromagnétiques parasites importants sont générés au niveau de ces têtes de distributeur, qu'il est donc important d'antiparasiter afin d'en éviter les nuisances.The heads of these distributors include a rotary contact forming a switch for successively connecting the spark plug power cables to a high voltage source. Significant stray electromagnetic fields are generated at these dispenser heads, which is therefore important to suppress in order to avoid nuisance.

Jusqu'à présent cet antiparasitage a été réalisé à l'aide d'une coquille moulée en matière plastique conductrice que l'on venait rapporter par dessus la tête de distributeur. Pour permettre sa mise en place, cette coquille était généralement réalisée en plusieurs parties assemblées au moment du montage sur la tête de distributeur.So far this interference suppression has been achieved using a molded shell of conductive plastic which was brought over the distributor head. To allow its installation, this shell was generally made of several parts assembled at the time of mounting on the dispenser head.

Il en résulte un coût important, tant pour la fabrication de la coquille que pour son installation et sa connexion à la masse.This results in a significant cost, both for the manufacture of the shell and for its installation and connection to ground.

La présente invention vise à pallier cet inconvénient. The present invention aims to overcome this drawback.

A cet effet, l'invention a tout d'abord pour objet un procédé d'antiparasitage de la tête d'un distributeur de véhicule automobile, caractérisé par le fait qu'il consiste à surmouler au moins une partie de ladite tête à l'aide d'une matière thermoplastique conductrice, et à relier ladite matière thermoplastique à la masse.To this end, the invention firstly relates to a method of suppressing the head of a motor vehicle distributor, characterized in that it consists in overmolding at least part of said head with the using a conductive thermoplastic material, and connecting said thermoplastic material to ground.

Le procédé de surmoulage selon l'invention permet de réaliser l'antiparasitage à moindre coût. En outre, il est aisé par ce procédé de limiter au minimum nécessaire la surface de la tête de distributeur recouverte par la matière d'antiparasitage. Il est ainsi possible d'économiser sur la quantité de matière utilisée.The overmolding process according to the invention makes it possible to achieve interference suppression at a lower cost. In addition, it is easy by this method to limit to the minimum necessary the surface of the dispenser head covered by the suppressor material. It is thus possible to save on the quantity of material used.

Dans un mode de réalisation particulier appliqué à une tête de distributeur en matière plastique comportant au moins un insert métallique de fixation surmoulé par ladite matière plastique, la liaison à la masse de la matière d'antiparasitage s'effectue par surmoulage par ladite matière thermoplastique d'une partie de l'insert dépassant de ladite matière plastique.In a particular embodiment applied to a plastic distributor head comprising at least one metal fixing insert overmolded by said plastic material, the bonding to ground of the interference-suppressing material is effected by overmolding by said thermoplastic material d 'a part of the insert protruding from said plastic.

Plus aucune opération de connexion du revêtement d'antiparasitage à la masse n'est ainsi nécessaire.There is no longer any need to connect the interference suppression coating to earth.

L'invention a également pour objet une tête de distributeur antiparasitée, caractérisée par le fait qu'elle comporte un surmoulage en matière thermoplastique conductrice.The invention also relates to an antiparasitic dispenser head, characterized in that it comprises an overmolding in conductive thermoplastic material.

Cette matière présente de préférence une résistivité inférieure à 100 A m, par exemple de l'ordre de 60-n-.m. This material preferably has a resistivity of less than 100 A m, for example of the order of 60-n-.m.

Une telle tête, réalisée en matière plastique, peut notamment comporter au moins un insert métallique de fixation dont une partie est surmoulée par ladite matière plastique et une autre partie est surmoulée par ladite matière thermoplastique conductrice.Such a head, made of plastic, may in particular comprise at least one metal fixing insert, part of which is molded by said plastic material and another part is molded by said conductive thermoplastic material.

On décrira maintenant à titre d'exemple non limitatif un mode de réalisation particulier de l'invention, en référence à la figure unique annexée représentant, vue de côté partiellement en coupe axiale, une tête de distributeur selon l'invention.A particular embodiment of the invention will now be described by way of nonlimiting example, with reference to the single appended figure representing, seen from the side partially in axial section, a dispenser head according to the invention.

Cette figure représente une tête 1 de distributeur destinée à être fixée sur un corps de distributeur 2.This figure represents a distributor head 1 intended to be fixed to a distributor body 2.

La tête 1 est formée pour l'essentiel d'une jupe cylindrique 3, fermée à sa partie supérieure, et comportant à sa partie inférieure, autour de son ouverture, un flasque de montage 4, destiné à venir en contact avec le distributeur 2. A sa partie supérieure, la tête 1 comprend de façon connue des manchons 5 d'isolement des connexions électriques haute tension, non représentées.The head 1 is essentially formed by a cylindrical skirt 3, closed at its upper part, and comprising at its lower part, around its opening, a mounting flange 4, intended to come into contact with the distributor 2. At its upper part, the head 1 comprises in known manner sleeves 5 for isolating the high voltage electrical connections, not shown.

Les parties 3, 4 et 5 de la tête 1 sont réalisées d'une seule pièce par moulage.Parts 3, 4 and 5 of the head 1 are made in one piece by molding.

Lors de ce moulage, des inserts métalliques 6 destinés au passage des boulons de fixation de la tête, ont une partie 7 de leur longueur surmoulée dans le flasque 4, et une partie 8 dépassante. During this molding, metal inserts 6 intended for the passage of the head fixing bolts, have a part 7 of their length overmolded in the flange 4, and a protruding part 8.

La tête ainsi réalisée en matière thermoplastique ou thermodurcissable est ensuite surmoulée à l'aide d'une matière thermoplastique conductrice 9, en incluant dans ce surmoulage les parties 8 des inserts 6 dépassant du flasque 4.  The head thus produced in thermoplastic or thermosetting material is then overmolded using a conductive thermoplastic material 9, including in this overmolding the parts 8 of the inserts 6 protruding from the flange 4.

Le revêtement surmoulé 9 étant réalisé en matière conductrice assure donc l'antiparasitage de la tête 1, la mise à la masse de ce revêtement étant effectuée par l'intermédiaire des inserts métalliques 8 et des moyens de fixation en contact avec ces inserts (vis traversantes,...).The overmolded coating 9 being made of conductive material therefore ensures the interference suppression of the head 1, the grounding of this coating being effected by means of the metal inserts 8 and fixing means in contact with these inserts (through screws , ...).

Les zones de la surface de la tête 1 qui doivent être recouvertes du revêtement 9 sont déterminées expérimentalement de manière à assurer un niveau convenable d'antiparasitage, tout en utilisant le moins possible de matière conductrice de surmoulage. The areas of the surface of the head 1 which are to be covered with the coating 9 are determined experimentally so as to ensure a suitable level of interference suppression, while using as little as possible of conductive molding material.

Claims (5)

REVENDICATIONS 1. Procédé d'antiparasitage de la tête d'un distributeur de véhicule automobile, caractérisé par le fait qu'il consiste à surmouler au moins une partie de ladite tête (1) à l'aide d'une matière thermoplastique conductrice (3), et à relier ladite matière thermoplastique à la masse.1. A method of suppressing the head of a motor vehicle distributor, characterized in that it consists in overmolding at least part of said head (1) using a conductive thermoplastic material (3) , and to connect said thermoplastic material to ground. 2. Procédé selon la revendication 1, pour une tête en matière plastique comportant au moins un insert métallique (6) de fixation surmoulé par ladite matière plastique formant la tête, dans lequel ladite liaison à la masse de la matière d'antiparasitage s'effectue par surmoulage par ladite matière thermoplastique d'une partie (8) de l'insert dépassant de ladite matière plastique formant la tête.2. Method according to claim 1, for a plastic head comprising at least one metal insert (6) for fixing overmolded by said plastic material forming the head, in which said connection to the ground of the interference suppressing material takes place by overmolding by said thermoplastic material a part (8) of the insert projecting from said plastic material forming the head. 3. Tête de distributeur antiparasitée, caractérisée par le fait qu'elle comporte un surmoulage (9) en matière thermoplastique conductrice. 3. Antiparasitic distributor head, characterized in that it comprises an overmolding (9) made of conductive thermoplastic material. 4. Tête de distributeur selon la revendication 3, dans laquelle la matière thermoplastique conductrice présente une résistivité inférieure à l00#.m. 4. Dispenser head according to claim 3, in which the conductive thermoplastic material has a resistivity of less than 100 # .m. 5. Tête de distributeur en matière plastique selon l'une quelconque des revendications 3 et 4, comportant au moins un insert métallique (6) de fixation dont une partie (7) est surmoulée par ladite matière plastique formant la tête et une autre partie (8) est surmoulée par ladite matière thermoplastique conductrice. 5. Plastic distributor head according to any one of claims 3 and 4, comprising at least one metal insert (6) for fixing, a part (7) of which is overmolded by said plastic material forming the head and another part ( 8) is overmolded by said conductive thermoplastic material.
FR9300080A 1993-01-07 1993-01-07 Anti-parasitic distributor cap for motor car Pending FR2700224A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9300080A FR2700224A1 (en) 1993-01-07 1993-01-07 Anti-parasitic distributor cap for motor car

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9300080A FR2700224A1 (en) 1993-01-07 1993-01-07 Anti-parasitic distributor cap for motor car

Publications (1)

Publication Number Publication Date
FR2700224A1 true FR2700224A1 (en) 1994-07-08

Family

ID=9442869

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9300080A Pending FR2700224A1 (en) 1993-01-07 1993-01-07 Anti-parasitic distributor cap for motor car

Country Status (1)

Country Link
FR (1) FR2700224A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056957A1 (en) * 1981-01-22 1982-08-04 Nissan Motor Co., Ltd. Distributor for an internal combustion engine
FR2522071A1 (en) * 1982-02-19 1983-08-26 Mitsubishi Electric Corp DISPENSER FOR REMOVING ELECTROMAGNETIC WAVES FROM AN INTERNAL COMBUSTION ENGINE
DE3329647A1 (en) * 1983-08-17 1985-02-28 Robert Bosch Gmbh, 7000 Stuttgart INSULATING CAP CAPING TO COVER A DISTRIBUTOR
EP0311468A1 (en) * 1987-10-07 1989-04-12 Sagem Allumage Distribution rotor for an ignition distributor of an internal-combustion engine of an automotive vehicle
EP0375926A2 (en) * 1988-12-24 1990-07-04 Robert Bosch Gmbh Noise-suppressing shielding, in particular for an ignition distributor cap
DE4118388A1 (en) * 1991-06-05 1992-01-23 Tech Wissenschaftliche Ges Thi Composite with electrically insulating mouldable material on side - and electrically conductive material contg. carbon, black on opposite side of polyvinyl chloride

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056957A1 (en) * 1981-01-22 1982-08-04 Nissan Motor Co., Ltd. Distributor for an internal combustion engine
FR2522071A1 (en) * 1982-02-19 1983-08-26 Mitsubishi Electric Corp DISPENSER FOR REMOVING ELECTROMAGNETIC WAVES FROM AN INTERNAL COMBUSTION ENGINE
DE3329647A1 (en) * 1983-08-17 1985-02-28 Robert Bosch Gmbh, 7000 Stuttgart INSULATING CAP CAPING TO COVER A DISTRIBUTOR
EP0311468A1 (en) * 1987-10-07 1989-04-12 Sagem Allumage Distribution rotor for an ignition distributor of an internal-combustion engine of an automotive vehicle
EP0375926A2 (en) * 1988-12-24 1990-07-04 Robert Bosch Gmbh Noise-suppressing shielding, in particular for an ignition distributor cap
DE4118388A1 (en) * 1991-06-05 1992-01-23 Tech Wissenschaftliche Ges Thi Composite with electrically insulating mouldable material on side - and electrically conductive material contg. carbon, black on opposite side of polyvinyl chloride

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