EP0072266B1 - Procédé d'obtention d'une bobine à circuit magnétique fermé et à aimant permanent pour l'allumage de moteurs à combustion - Google Patents

Procédé d'obtention d'une bobine à circuit magnétique fermé et à aimant permanent pour l'allumage de moteurs à combustion Download PDF

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Publication number
EP0072266B1
EP0072266B1 EP19820401174 EP82401174A EP0072266B1 EP 0072266 B1 EP0072266 B1 EP 0072266B1 EP 19820401174 EP19820401174 EP 19820401174 EP 82401174 A EP82401174 A EP 82401174A EP 0072266 B1 EP0072266 B1 EP 0072266B1
Authority
EP
European Patent Office
Prior art keywords
strips
permanent magnet
magnetic circuit
process according
coil
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
EP19820401174
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0072266A1 (fr
Inventor
Pierre Peghaire
Jean Batifoulier
Jean Marie Pierret
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.)
Ducellier et Cie
Original Assignee
Ducellier et Cie
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 Ducellier et Cie filed Critical Ducellier et Cie
Publication of EP0072266A1 publication Critical patent/EP0072266A1/fr
Application granted granted Critical
Publication of EP0072266B1 publication Critical patent/EP0072266B1/fr
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H01F27/2455—Magnetic cores made from sheets, e.g. grain-oriented using bent laminations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F29/146—Constructional details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

Definitions

  • the invention relates to a method for obtaining a coil with a closed magnetic circuit and a permanent magnet for the ignition of internal combustion engines, in particular of motor vehicles, coil comprising a primary winding and a secondary winding surrounding at least one of the branches of the magnetic circuit.
  • This magnetic circuit consists of strips, of sheet metal, of different lengths, stacked on each other and folded so as to form a closed circuit, without magnetic seal, circuit in which is placed a permanent magnet with a surface larger than the section. of said circuit which further comprises elements for deriving the flux created by the primary winding.
  • an ignition coil with a closed magnetic circuit comprising a permanent magnet magnetized in the direction of its thickness so that the magnetic flux it generates is opposite to the flux produced by the primary winding of said coil.
  • This ignition coil provides a significant improvement over a coil without a permanent magnet, due to the fact that the use - of a large part of the hysteresis cycle, due to the presence of the permanent magnet, allows to reduce the dimensions.
  • Another drawback of this circuit is that the performance of the coil is conditioned in part by the quality of the magnetic seal located in the center of the branch surrounded by the primary and secondary windings and in the plane of the permanent magnet - magnetic circuit joint.
  • This quality which intervenes in the reluctance of the magnetic circuit is dependent on the differences in thickness of the permanent magnet disposed opposite the branch surrounded by the windings, which differences in thickness are inherent in any mass production.
  • a magnetic circuit overcomes these drawbacks.
  • This circuit consisting on the one hand of sheet metal portions, cut in the shape of L, of 1 and of U is assembled so as to form a closed circuit comprising a permanent magnet in the branch opposite to the branch surrounded by the windings.
  • This permanent magnet magnetized in the direction of its thickness, is arranged in the same way as in French patents 1 041 524, 1 048 081 and German DE-A-1 464 202, that is to say not perpendicular to the section of the magnetic circuit.
  • This arrangement makes it possible to increase the surface of the magnet and thus the flux emitted by this magnet, without increasing the section of the sheets constituting the magnetic circuit, hence a space requirement and a reduced weight.
  • a flow diversion circuit created by the primary winding a circuit of the type described in French patent 2 168 919, allows the use of a permanent magnet with a low coercive field, inexpensive and available in large quantities.
  • This branch circuit in this exemplary embodiment advantageously consists of plates, of mild steel sheet, arranged, by means of an insulating material, at a predetermined distance, on either side of the planes defining the thickness of the branch in which the magnet is placed.
  • this magnetic circuit has the drawback of having a magnetic seal arranged, in this example, at one end of the branch surrounded by the primary and secondary windings.
  • This essential magnetic seal in order to be able to place the pre-wound windings on one of the branches, when these circuits consist of sheets cut in the shape of an E, L or U, increases the reluctance of the circuit, which must be compensated by an increase. of the surface of the permanent magnet, hence a non-optimum dimensioning of the ignition coil.
  • the invention overcomes this drawback and to this end relates to a process for obtaining a closed circuit coil with a permanent magnet, for the ignition of internal combustion engines, coil comprising a primary winding and a secondary winding. surrounding, at least, one branch of the magnetic circuit made up of strips of sheet metal, of different lengths stacked on each other and folded so as to form a closed magnetic circuit in which is placed a permanent magnet of which the largest surfaces S1 are more important than section S2 of said cir baked, ignition coil comprising a metal fixing flange and a half-shell enclosing the magnetic circuit over half its thickness, flange serving as a circuit for diverting the flux created by the primary winding, characterized in that the magnetic circuit consisting of a single stack of sheet metal strips, of different lengths, is shaped, by folding, to close it on the surfaces S1 of the permanent magnet, after the windings are placed on the branch around which they are arranged.
  • This method has the advantage that it is thus possible to reduce the dimensions of the magnetic circuit of the ignition coil to the maximum compatible with the required ignition characteristics, which makes it possible to reduce the weight of said coil and thus responds to the trend. current weight reduction of motor vehicles in order to reduce fuel consumption.
  • the ignition coil shown in Figures 1 and 2 comprises a primary winding 1 and a secondary winding 2 surrounding a branch of the magnetic circuit 3 consisting of strips 4 of mild steel sheet. These strips of different lengths are stacked on each other with a predetermined longitudinal offset and folded so as to form a closed magnetic circuit in which is placed a permanent magnet 5 whose surfaces S1 are larger than the section S2 of said circuit.
  • the ignition coil comprises elements for diverting the flux created by the primary winding 1, when it is energized.
  • These bypass elements consist in this embodiment of a flange 6, made of mild steel sheet, which U-shaped flange, has extensions 6a, 6b, which allow the fixing of the coil on the motor vehicle. .
  • a screw 7 keeps pressed half-shells 8 against each other in which the magnetic circuit 3 is enclosed.
  • These half shells 8, of molded insulating material maintain at a predetermined distance d, the metal flange 6, on either side of the planes defining the thickness E (see FIG. 2) of the magnetic circuit 3, in the zone where is arranged the permanent magnet 5.
  • the windings 1 and 2 previously wound around insulating supports 9 and 10 are placed in a box 11, made of plastic.
  • the primary winding 1 and secondary 2 are connected by one of their ends to a terminal 12, supply from the on-board battery of the vehicle (not shown).
  • the winding 1 is connected by its other end to a terminal 13 ensuring the connection with a mechanical or electronic breaker (not shown) the winding 2 being connected to a terminal 14 for output of the secondary voltage.
  • the strips 4 are first folded, at right angles, using appropriate tools on either side of the housing 11 so as to form a U, after which the portion 4a and then the portion 4b are also folded at a right angle to come to be applied to the surfaces S1 of the permanent magnet 5, which at this stage of manufacture is materialized by a removable tool.
  • the permanent magnet 5 is positioned in place of the removable tool.
  • a first half-shell 8 encloses the magnetic circuit 3 over half of its thickness E, thus maintaining the portions 4a, 4b in contact with the surfaces S1 of the permanent magnet, after which the second half-shell 8 is positioned, then the flange 6, the screw 7 now pressed, one against the other, said shells.
  • the branch 4b, around which the windings 1 and 2 are arranged is shaped so as to have a substantially circular shape (see FIG. 4) so as to have a cylindrical zone on which the primary winding 1 is wound, after interposition of an insulating coating between this cylindrical zone and the winding.
  • the insulating coating in this exemplary embodiment is produced according to a well-known technique which consists in spraying an insulating material, such as an epoxy resin, in the form of powder on the cylindrical zone previously heated.
  • the powder thus applied melts and thus forms a continuous layer of approximately 0.2 to 0.3 millimeter thick.
  • This second embodiment makes it possible, for certain applications, to improve the exchanges between the magnetic circuit 3 and the primary winding 1, the magnetic circuit serving to evacuate the heat produced by the winding during the operation of the ignition coil.
  • the substantially circular shape (see fig. 4) is obtained after total stacking of the strips 4 and introduction of this stacking of strips, in an appropriate device (not shown) comprising a matrix, concave, in two parts and a punch also in two parts.
  • the strips 4 are in contact with the surfaces S1, of the permanent magnet 5, by means of a transverse camber 16 produced at each of the ends of the strips 4.
  • This embodiment makes it possible, if the required characteristics allow it, to dispense with the milling or broaching operation, which the first embodiment requires, an embodiment in which all the biased surfaces, obtained by milling or pinouts are in contact with the surfaces S1 of the permanent magnet, which eliminates parasitic air gaps.
  • the inner strip 4d and the outer strip 4e have a length such that, after folding, they respectively cover one of the surfaces S1 of the permanent magnet 5 and that they are in contact with the other strips by the transverse edge 17 of said strips .
  • the strips 4 have a length such that, after folding, the internal strip 4d and the external strip 4e respectively cover one of the surfaces S1 of the permanent magnet 5, the other strips 4 not covering, relative to the internal strips 4d and external 4th, that a fraction of the previous bands.
  • the permanent magnet 5 can be positioned, in its longitudinal direction, by means of the inner 4d and outer 4e bands, the end 18 of which is bent at right angles as shown in FIGS. 5, 6, 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP19820401174 1981-08-06 1982-06-25 Procédé d'obtention d'une bobine à circuit magnétique fermé et à aimant permanent pour l'allumage de moteurs à combustion Expired EP0072266B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8115259A FR2511184A1 (fr) 1981-08-06 1981-08-06 Procede d'obtention d'une bobine a circuit magnetique ferme et a aimant permanent pour l'allumage de moteur a combustion interne
FR8115259 1981-08-06

Publications (2)

Publication Number Publication Date
EP0072266A1 EP0072266A1 (fr) 1983-02-16
EP0072266B1 true EP0072266B1 (fr) 1986-04-30

Family

ID=9261235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820401174 Expired EP0072266B1 (fr) 1981-08-06 1982-06-25 Procédé d'obtention d'une bobine à circuit magnétique fermé et à aimant permanent pour l'allumage de moteurs à combustion

Country Status (4)

Country Link
EP (1) EP0072266B1 (enrdf_load_stackoverflow)
DE (1) DE3270848D1 (enrdf_load_stackoverflow)
ES (1) ES8306285A1 (enrdf_load_stackoverflow)
FR (1) FR2511184A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2531752A1 (fr) * 1982-08-11 1984-02-17 Ducellier & Cie Procede d'obtention d'une bobine a circuit magnetique ferme et a aimant permanent pour l'allumage de moteurs a combustion interne
DE3505367A1 (de) * 1985-02-15 1986-08-28 Daimler-Benz Ag, 7000 Stuttgart Zuendspule fuer brennkraftmaschinen
KR900016610A (ko) * 1988-04-26 1990-11-14 미쓰다 가쓰시게 내연기관용 점화코일 일체형 배전기
CA3152995A1 (en) * 2019-09-03 2021-03-11 Nippon Steel Corporation Wound core

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2236316A (en) * 1939-08-18 1941-03-25 Chicago Transformer Corp Induction coil
DE1464202A1 (de) * 1962-02-23 1969-05-22 Licentia Gmbh Permanentvormagnetisiertes induktives Element
FR1482818A (fr) * 1964-09-08 1967-06-02 Csf Perfectionnement aux bobines d'allumage pour moteurs à explosions
FR1533644A (fr) * 1967-08-04 1968-07-19 Lucas Industries Ltd Noyau feuilleté, notamment pour bobine d'allumage et son procédé de fabrication

Also Published As

Publication number Publication date
EP0072266A1 (fr) 1983-02-16
FR2511184B1 (enrdf_load_stackoverflow) 1984-06-29
ES514781A0 (es) 1983-05-01
FR2511184A1 (fr) 1983-02-11
DE3270848D1 (en) 1986-06-05
ES8306285A1 (es) 1983-05-01

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