EP0511062A1 - Method for sealing a device such as an induction coil - Google Patents

Method for sealing a device such as an induction coil Download PDF

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Publication number
EP0511062A1
EP0511062A1 EP92401090A EP92401090A EP0511062A1 EP 0511062 A1 EP0511062 A1 EP 0511062A1 EP 92401090 A EP92401090 A EP 92401090A EP 92401090 A EP92401090 A EP 92401090A EP 0511062 A1 EP0511062 A1 EP 0511062A1
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EP
European Patent Office
Prior art keywords
overmolding
sealing
coil
induction coil
mold
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
EP92401090A
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German (de)
French (fr)
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EP0511062B1 (en
Inventor
Pierre Héritier-Best
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
Publication of EP0511062A1 publication Critical patent/EP0511062A1/en
Application granted granted Critical
Publication of EP0511062B1 publication Critical patent/EP0511062B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12Insulating of windings
    • H01F41/127Encapsulating or impregnating

Definitions

  • the present invention relates to a method of sealing a part such as an induction coil and a mold for the implementation of this method.
  • Induction coils used for example in the automotive industry, are generally overmolded, after their manufacture, using a plastic material intended to give it its final dimensions and appearance.
  • the present invention aims to overcome these drawbacks by providing in particular a method making it possible to ensure leaktight protection for any part, including or not a winding, in particular induction coils, sensors or connector elements.
  • the present invention firstly relates to a method of sealing a part such as an induction coil, characterized in that an overmolding of the part is carried out, for example by soaking followed by baking, using a thermosetting vinyl resin.
  • the part is coated with a waterproof layer, for example a few tenths of a millimeter thick.
  • a second overmolding is preferably carried out with a plastic material, in known manner.
  • the finished part is entirely coated with the plastic material of the second overmolding, the sealing being thus practically absolute, even in the case where parts of the original part remained visible after the first overmolding.
  • connection wires exit from the finished part the sealing at their exit is carried out in a known manner using a cable gland.
  • the second overmolding can also have the aim of giving the finished part the desired appearance and dimensions. It will be noted in this regard that the invention is particularly well suited to sealing parts in which the distance of the internal elements from the faces of the finished part is not critical to a few tenths of a millimeter near the thickness of the layer of vinyl resin.
  • the present invention also relates to a mold for the aforementioned second overmolding, this mold comprising fingers projecting inward for centering the part molded by said synthetic resin.
  • FIG. 1 represents a coil comprising a coil 1, made of plastic, and on which a coil 2 is wound.
  • thermosetting vinyl resin such as for example the resin sold under the brand Plastisol, by the company PPG Industries (France) S.A.
  • the part is first brought to a temperature of, for example, between 140 and 160 degrees C.
  • the resin in which the part is soaked is at a temperature, for example, of between 28 and 30 degrees C, its viscosity being then about 35 poises.
  • Immersion into and out of the soaking tank is carried out slowly, if possible slowing down on the horizontal parts.
  • the actual soaking can for example last a few seconds or a few tens of seconds, after which the part is removed and drained, and preferably pre-dried before cooking, for a few tens of minutes.
  • the part thus coated with vinyl resin is then subjected to cooking, for for example twenty minutes, at a temperature of the order of 160 to 170 degrees C.
  • the part is coated with a layer of hardened resin 3, of thickness for example between 3 and 8 / 10ths of a millimeter.
  • the coil has been quenched vertically by gripping it by its end 1 ′, up to the level of the plane P.
  • the coil coated with its insulating layer 3 is then placed in a mold 5 to undergo a second overmolding with any suitable plastic material.
  • This final overmolding allows the already waterproof product to withstand the various chemical and mechanical stresses, and to respect the required dimensional tolerances.
  • the mold 5 has fingers 6, projecting inwardly, and resting on the layer 3, to ensure the centering of the part. This arrangement naturally supposes that variations in the position of the coil of a few tenths of a millimeter with respect to the surfaces of the final part are allowed, due to variations in the thickness of the waterproof vinyl layer 3.
  • FIG. 2 represents another coil 7, produced according to the invention.
  • This coil comprises, as before, a coil 1 on which a coil 2 is wound, the assembly being coated with the waterproof vinyl layer 3.
  • FIG. 2 also shows the final overmolding layer 8, produced in a mold such as the mold 5, and giving the part its appearance and its final dimensions.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Induction Heating (AREA)
  • Insulating Of Coils (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Abstract

Method for sealing a device such as an induction coil and mould for carrying out the method. The subject of the invention is a method for sealing a device such as an induction coil. For this purpose, the device is shrouded in a heat-settable vinyl resin (3). <IMAGE>

Description

La présente invention concerne un procédé d'étanchéification d'une pièce telle qu'une bobine d'induction et un moule pour la mise en oeuvre de ce procédé.The present invention relates to a method of sealing a part such as an induction coil and a mold for the implementation of this method.

Les bobines d'induction, utilisées par exemple dans l'industrie automobile, sont généralement surmoulées, après leur fabrication, à l'aide d'une matière plastique destinée à lui donner ses cotes et son aspect définitifs.Induction coils, used for example in the automotive industry, are generally overmolded, after their manufacture, using a plastic material intended to give it its final dimensions and appearance.

Jusqu'à présent, ce surmoulage était réalisé directement sur la bobine, éventuellement après application d'un vernis de maintien du bobinage. L'inconvénient de ce procédé résidait dans le fait qu'il est pratiquement impossible de réaliser une bonne étanchéité entre la pièce, notamment dans ses parties en matière plastique, et le surmoulage, des infiltrations d'humidité pouvant par conséquent toujours se produire à ces interfaces. Ces défauts d'étanchéité étaient principalement localisés au niveau des doigts de centrage de la pièce dans le moule, ces doigts faisant saillie, par exemple du bobineau de la bobine, pour venir en contact avec les parois du moule.Until now, this overmolding has been carried out directly on the reel, possibly after application of a winding holding varnish. The disadvantage of this process lay in the fact that it is practically impossible to achieve a good seal between the part, in particular in its plastic parts, and the overmolding, infiltration of humidity which can therefore always occur at these interfaces. These leaks were mainly located at the centering fingers of the part in the mold, these fingers protruding, for example from the spool of the coil, to come into contact with the walls of the mold.

La présente invention vise à pallier ces inconvénients en fournissant notamment un procédé permettant d'assurer une protection étanche à toute pièce, comprenant ou non un bobinage, en particulier des bobines d'induction, des capteurs ou des éléments de connectique.The present invention aims to overcome these drawbacks by providing in particular a method making it possible to ensure leaktight protection for any part, including or not a winding, in particular induction coils, sensors or connector elements.

A cet effet, la présente invention a tout d'abord pour objet un procédé d'étanchéification d'une pièce telle qu'une bobine d'induction, caractérisé par le fait que l'on réalise un surmoulage de la pièce, par exemple par trempage suivi d'une cuisson, à l'aide d'une résine vinylique thermodurcissable.To this end, the present invention firstly relates to a method of sealing a part such as an induction coil, characterized in that an overmolding of the part is carried out, for example by soaking followed by baking, using a thermosetting vinyl resin.

Il résulte de la mise en oeuvre de ce procédé, que la pièce est revêtue d'une couche étanche, par exemple de quelques dixièmes demillimètres d'épaisseur.It follows from the implementation of this method that the part is coated with a waterproof layer, for example a few tenths of a millimeter thick.

Dans le cas notamment où la pièce d'origine n'est pas entièrement revêtue de la couche étanche, par exemple aux emplacements auxquels elle est saisie lors du trempage, on réalise de préférence un deuxième surmoulage avec une matière plastique, de manière connue.In the case in particular where the original part is not entirely coated with the waterproof layer, for example at the locations at which it is gripped during the soaking, a second overmolding is preferably carried out with a plastic material, in known manner.

Dans ces conditions, la pièce finie est entièrement revêtue de la matière plastique du deuxième surmoulage, l'étanchéité étant ainsi pratiquement absolue, même dans le cas où des parties de la pièce d'origine restaient apparentes après le premier surmoulage.Under these conditions, the finished part is entirely coated with the plastic material of the second overmolding, the sealing being thus practically absolute, even in the case where parts of the original part remained visible after the first overmolding.

Dans le cas où des fils de connection sortent de la pièce finie, l'étanchéification au niveau de leur sortie est réalisée de manière connue à l'aide d'un presse-étoupe.In the case where connection wires exit from the finished part, the sealing at their exit is carried out in a known manner using a cable gland.

Le deuxième surmoulage peut également avoir pour but de donner à la pièce finie l'aspect et les dimensions souhaités. On remarquera à ce sujet que l'invention est particulièrement bien adaptée à l'étanchéification de pièces dans lesquelles la distance des éléments internes aux faces de la pièce finie ne sont pas critiques aux quelques dixièmes de millimètres près de l'épaisseur de la couche de résine vinylique.The second overmolding can also have the aim of giving the finished part the desired appearance and dimensions. It will be noted in this regard that the invention is particularly well suited to sealing parts in which the distance of the internal elements from the faces of the finished part is not critical to a few tenths of a millimeter near the thickness of the layer of vinyl resin.

La présente invention à également pour objet un moule pour le deuxième surmoulage précité, ce moule comportant des doigts en saillie vers l'intérieur pour le centrage de la pièce surmoulée par ladite résine synthétique.The present invention also relates to a mold for the aforementioned second overmolding, this mold comprising fingers projecting inward for centering the part molded by said synthetic resin.

On décrira maintenant, à titre d'exemple non limitatif, des modes de réalisation particuliers de l'invention en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue axiale d'une bobine revêtue d'une protection étanche selon l'invention, représentée schématiquement dans le moule du deuxième surmoulage et,
  • la figure 2 est une vue partielle, en perspective et en coupe, d'une bobine réalisée conformément à la présente invention.
We will now describe, by way of nonlimiting example, particular embodiments of the invention with reference to the appended drawings in which:
  • FIG. 1 is an axial view of a coil coated with a waterproof protection according to the invention, shown diagrammatically in the mold of the second overmolding and,
  • Figure 2 is a partial view, in perspective and in section, of a coil produced in accordance with the present invention.

La figure 1 représente une bobine comprenant un bobineau 1, réalisé en matière plastique, et sur lequel est enroulé un bobinage 2.FIG. 1 represents a coil comprising a coil 1, made of plastic, and on which a coil 2 is wound.

La bobine ainsi réalisée, est trempée dans une résine vinylique thermodurcissable, telle par exemple que la résine commercialisée sous la marque Plastisol, par la Société PPG Industries (France) S.A.The coil thus produced is dipped in a thermosetting vinyl resin, such as for example the resin sold under the brand Plastisol, by the company PPG Industries (France) S.A.

A cet effet, la pièce est tout d'abord portée à une température comprise par exemple entre 140 et 160 degrés C. La résine dans laquelle la pièce est trempée est à une température comprise par exemple entre 28 et 30 degrés C, sa viscocité étant alors d'environ 35 poises.To this end, the part is first brought to a temperature of, for example, between 140 and 160 degrees C. The resin in which the part is soaked is at a temperature, for example, of between 28 and 30 degrees C, its viscosity being then about 35 poises.

L'immersion et la sortie du bac de trempage s'effectue lentement avec si possible un ralentissement sur les parties horizontales.Immersion into and out of the soaking tank is carried out slowly, if possible slowing down on the horizontal parts.

Le trempage proprement dit peut par exemple durer quelques secondes ou quelques dizaines de secondes, après quoi la pièce est retirée et égouttée, et de préférence préséchée avant cuisson, pendant quelques dizaines de minutes.The actual soaking can for example last a few seconds or a few tens of seconds, after which the part is removed and drained, and preferably pre-dried before cooking, for a few tens of minutes.

La pièce ainsi enduite de résine vinylique est alors soumise à une cuisson, pendant par exemple vingt minutes, à une température de l'ordre de 160 à 170 degrés C.The part thus coated with vinyl resin is then subjected to cooking, for for example twenty minutes, at a temperature of the order of 160 to 170 degrees C.

Il en résulte que la pièce est revêtue d'une couche de résine durcie 3, d'épaisseur comprise par exemple entre 3 et 8/10ème de millimètres.As a result, the part is coated with a layer of hardened resin 3, of thickness for example between 3 and 8 / 10ths of a millimeter.

Dans le cas représenté au dessin, la bobine a été trempée verticalement en la saisissant par son extrémité 1′, jusqu'au niveau du plan P.In the case shown in the drawing, the coil has been quenched vertically by gripping it by its end 1 ′, up to the level of the plane P.

Les seuls défauts d'étanchéité ne peuvent donc se produire qu'au niveau de ce plan.The only leaks can therefore only occur at this plane.

On remarque par ailleurs que la face 4 du bobineau, qui n'a pas été immergée, reste fonctionnelle et adaptable. Ceci est particulièrement utile dans le cas de connections ou de la face active d'un capteur.We also note that the face 4 of the reel, which has not been submerged, remains functional and adaptable. This is particularly useful in the case of connections or the active face of a sensor.

La bobine revêtue de sa couche isolante 3 est ensuite placée dans un moule 5 pour y subir un deuxième surmoulage par toute matière plastique convenable. Ce surmoulage définitif permet au produit, déjà étanche, de résister aux diverses sollicitations chimiques et mécaniques, et de respecter les tolérances dimensionnelles exigées.The coil coated with its insulating layer 3 is then placed in a mold 5 to undergo a second overmolding with any suitable plastic material. This final overmolding allows the already waterproof product to withstand the various chemical and mechanical stresses, and to respect the required dimensional tolerances.

On remarque sur la figure 1 que le moule 5 comporte des doigts 6, en saillie vers son intérieur, et en appui sur la couche 3, afin d'assurer le centrage de la pièce. Cet agencement suppose bien entendu que l'on admette des fluctuations de position de la bobine de quelques dixième de millimètres par rapport aux surfaces de la pièce définitive, du fait des variations d'épaisseur de la couche vinylique étanche 3.Note in Figure 1 that the mold 5 has fingers 6, projecting inwardly, and resting on the layer 3, to ensure the centering of the part. This arrangement naturally supposes that variations in the position of the coil of a few tenths of a millimeter with respect to the surfaces of the final part are allowed, due to variations in the thickness of the waterproof vinyl layer 3.

La figure 2 représente une autre bobine 7, réalisée selon l'invention.FIG. 2 represents another coil 7, produced according to the invention.

Cette bobine comprend, comme précédemment, un bobineau 1 sur lequel est enroulé un bobinage 2, l'ensemble étant revêtu de la couche vinylique étanche 3.This coil comprises, as before, a coil 1 on which a coil 2 is wound, the assembly being coated with the waterproof vinyl layer 3.

Cette figure 2 montre également la couche de surmoulage définitif 8, réalisée dans un moule tel que le moule 5, et donnant à la pièce son aspect et ses cotes définitives.This FIG. 2 also shows the final overmolding layer 8, produced in a mold such as the mold 5, and giving the part its appearance and its final dimensions.

Claims (5)

Procédé d'étanchéification d'une pièce telle qu'une bobine d'induction, caractérisé par le fait que l'on réalise un surmoulage de la pièce à l'aide d'une résine vinylique thermodurcissable (3).Method for sealing a part such as an induction coil, characterized in that an overmolding of the part is carried out using a thermosetting vinyl resin (3). Procédé selon la revendication 1, dans lequel ledit surmoulage est réalisé par trempage.The method of claim 1, wherein said overmolding is performed by dipping. Procédé selon l'une quelconque des revendications 1 et 2, dans lequel le surmoulage est suivi d'une cuisson.Method according to either of Claims 1 and 2, in which the overmolding is followed by baking. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel la pièce surmoulée par ladite résine vinylique subit un deuxième surmoulage à l'aide d'une matière plastique (8).Method according to any one of claims 1 to 3, in which the part overmolded by said vinyl resin is subjected to a second overmolding using a plastic material (8). Moule pour réaliser le deuxième surmoulage selon la revendication 4, caractérisé par le fait qu'il comporte des doigts (6) en saillie vers l'intérieur pour le centrage de la pièce surmoulée par ladite résine synthétique.Mold for producing the second overmolding according to claim 4, characterized in that it comprises fingers (6) projecting inwardly for centering the part overmolded by said synthetic resin.
EP92401090A 1991-04-25 1992-04-17 Method for sealing a device such as an induction coil Expired - Lifetime EP0511062B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9105120 1991-04-25
FR919105120A FR2675943B1 (en) 1991-04-25 1991-04-25 PROCESS FOR SEALING A PART SUCH AS AN INDUCTION COIL AND MOLD FOR IMPLEMENTING THE PROCESS.

Publications (2)

Publication Number Publication Date
EP0511062A1 true EP0511062A1 (en) 1992-10-28
EP0511062B1 EP0511062B1 (en) 1996-07-17

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EP92401090A Expired - Lifetime EP0511062B1 (en) 1991-04-25 1992-04-17 Method for sealing a device such as an induction coil

Country Status (5)

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EP (1) EP0511062B1 (en)
JP (1) JPH05124114A (en)
AT (1) ATE140558T1 (en)
DE (1) DE69212208T2 (en)
FR (1) FR2675943B1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB678936A (en) * 1948-10-20 1952-09-10 Westinghouse Electric Int Co Improvements in or relating to the treating of electrical windings with insulating varnishes
GB916100A (en) * 1960-01-20 1963-01-16 Ass Elect Ind Improvements relating to insulating coatings on metals
CA737883A (en) * 1966-07-05 Chrysler Corporation Coil coating method
US3352711A (en) * 1959-12-01 1967-11-14 Gen Electric Method of making electrical coils
DE1270884B (en) * 1962-03-14 1968-06-20 Bosch Gmbh Robert Process for the production of an ignition coil for ignition systems of internal combustion engines over-molded with synthetic resin
US3504431A (en) * 1966-09-27 1970-04-07 Gen Electric Method of manufacturing insulated electrical members
FR2243509A1 (en) * 1973-09-06 1975-04-04 Siemens Ag Method for insulating and encapsulating electrical windings - involves turning winding on its axis and plunging it into insulating and rapid hardening medium
GB2112258A (en) * 1981-12-21 1983-07-13 Robert Stanley Ruffini Inductor coating therefor and method of applying the coating
US4983669A (en) * 1988-03-07 1991-01-08 Aristech Chemical Corporation Thermosetting composition from maleimide, olefinic monomer and unsaturated polyester

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6113611A (en) * 1984-06-29 1986-01-21 Mitsubishi Electric Corp Manufacture of insulated coil

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA737883A (en) * 1966-07-05 Chrysler Corporation Coil coating method
GB678936A (en) * 1948-10-20 1952-09-10 Westinghouse Electric Int Co Improvements in or relating to the treating of electrical windings with insulating varnishes
US3352711A (en) * 1959-12-01 1967-11-14 Gen Electric Method of making electrical coils
GB916100A (en) * 1960-01-20 1963-01-16 Ass Elect Ind Improvements relating to insulating coatings on metals
DE1270884B (en) * 1962-03-14 1968-06-20 Bosch Gmbh Robert Process for the production of an ignition coil for ignition systems of internal combustion engines over-molded with synthetic resin
US3504431A (en) * 1966-09-27 1970-04-07 Gen Electric Method of manufacturing insulated electrical members
FR2243509A1 (en) * 1973-09-06 1975-04-04 Siemens Ag Method for insulating and encapsulating electrical windings - involves turning winding on its axis and plunging it into insulating and rapid hardening medium
GB2112258A (en) * 1981-12-21 1983-07-13 Robert Stanley Ruffini Inductor coating therefor and method of applying the coating
US4983669A (en) * 1988-03-07 1991-01-08 Aristech Chemical Corporation Thermosetting composition from maleimide, olefinic monomer and unsaturated polyester

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 158 (E-409)(2214) 6 Juin 1986 & JP-A-61 013 611 ( MITSUBISHI DENKI ) *

Also Published As

Publication number Publication date
EP0511062B1 (en) 1996-07-17
ATE140558T1 (en) 1996-08-15
DE69212208T2 (en) 1997-02-20
DE69212208D1 (en) 1996-08-22
FR2675943A1 (en) 1992-10-30
JPH05124114A (en) 1993-05-21
FR2675943B1 (en) 1994-10-21

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