EP0034955B1 - Bobine d'allumage pour moteurs à combustion interne - Google Patents

Bobine d'allumage pour moteurs à combustion interne Download PDF

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Publication number
EP0034955B1
EP0034955B1 EP81400073A EP81400073A EP0034955B1 EP 0034955 B1 EP0034955 B1 EP 0034955B1 EP 81400073 A EP81400073 A EP 81400073A EP 81400073 A EP81400073 A EP 81400073A EP 0034955 B1 EP0034955 B1 EP 0034955B1
Authority
EP
European Patent Office
Prior art keywords
branch
ignition coil
permanent magnet
coil according
branches
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
EP81400073A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0034955A1 (fr
Inventor
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
Priority claimed from FR8003653A external-priority patent/FR2476218A1/fr
Priority claimed from FR8009742A external-priority patent/FR2481753A2/fr
Application filed by Ducellier et Cie filed Critical Ducellier et Cie
Publication of EP0034955A1 publication Critical patent/EP0034955A1/fr
Application granted granted Critical
Publication of EP0034955B1 publication Critical patent/EP0034955B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • 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 present invention relates to an ignition coil for an internal combustion engine, in particular for a motor vehicle, coil comprising a closed magnetic circuit consisting of a plurality of sheets which, by assembly, form a rectangular frame with branches of rectangular cross section, of which one has a permanent magnet and the opposite branch of which is surrounded by a primary winding and a secondary winding.
  • Another drawback of this circuit is that the performance of the coil is conditioned in part by the quality of the magnetic junction located at the center of the branch surrounded by the primary and secondary windings and parallel to the plane of the permanent magnet-magnetic circuit joint.
  • the object of the present invention is to remedy these drawbacks and to this end relates to an ignition coil for internal combustion engines, comprising a closed magnetic circuit consisting of a plurality of sheets which by assembly form a rectangular frame with branches of section rectangular right, a permanent magnet arranged between two half-branches which define a branch, a primary winding and a secondary winding surrounding an opposite branch, characterized in that the magnetic circuit comprises at least one magnetic junction disposed at one of the ends of the branch along a plane forming an acute angle with the plane of the faces of the permanent magnet adjacent to the circuit, and in that the thickness of the branch on which the primary winding and the secondary winding are arranged is less than l thickness of the other branches of the magnetic circuit.
  • Figure 1 is a top view in partial section of an ignition coil according to a first embodiment of the invention.
  • Figure 2 is a side view of this coil.
  • Figure 3 is a top view in partial section of an ignition coil according to a second embodiment of the invention.
  • the ignition coil according to the invention (see FIG. 1) comprises a closed magnetic circuit 1, made up of a plurality of sheets.
  • a permanent magnet 2 magnetized in the direction of its thickness is placed in a branch 3 of said circuit 1.
  • a primary winding 4 and a secondary winding 5 surround the branch 6 which branch 6 is in this embodiment, made up of a fraction of the sheets constituting the half-branch 3a, forming with the half-branch 3b, the branch 3.
  • the thickness E ′ of the branch 6 (see FIG. 2) is, in this example of embodiment less than approximately twice the thickness E of the branch 3.
  • a magnetic junction 7 (see Figure 1) is provided at one end of the branch 6, and is arranged in a plane forming an acute angle a with the plane of the faces 2a and 2b of the permanent magnet 2 adjacent to the half -branches 3a and 3b.
  • the half-branches 3a and 3b consist of sheets of unequal lengths so that a fraction of these sheets covers, on either side of the primary 4 and secondary 5 windings, the ends of the branch 6.
  • this magnetic circuit eliminates the drawbacks cited from the prior art, by the fact that a large surface permanent magnet is provided in a magnetic circuit whose weight and dimensions have been reduced to the maximum, compatible with the performance of the ignition coil.
  • the large thickness E of the half branches in which the permanent magnet is arranged allows a significant reduction in the perimeter of the magnetic circuit and correspondingly a reduced size of the ignition coil.
  • the magnetic junction located at one end of the branch surrounded by the primary and secondary windings, and forming an acute angle a with the plane of the faces adjacent to the permanent magnet absorbs the differences in thickness of the permanent magnet due to manufacturing tolerances and also the cutting tolerances of the sheets constituting the magnetic circuit.
  • This first embodiment has the drawback, however, that the flow reversal created in the branch surrounded by the primary and secondary windings by the current flowing in the primary winding requires the use of a magnet having a very coercive field. high so as to avoid demagnetization when the flux is reversed.
  • a magnetic circuit of this kind is known, in particular from document FR-A-2 168 919; but its design has the drawback of having a space requirement and therefore a weight which is too great due to the fact that the portion of deflection of the flux produced by the primary winding actually constitutes an independent circuit.
  • the second embodiment of the magnetic circuit according to the invention aims to remedy this drawback.
  • an air gap F of predetermined value is created between the half branch 3a and the half branch 3b by a spoiler 3c forming a projection at one of the ends of the half branch 3b.
  • the air gap F is located in the extension of the magnet 2 at its face 2b.
  • Another air gap F 'of predetermined value is created between the edge of the sheets, of the half branch 3b, constituting the small base 3d, of the portion of said half branch, having a top view of the shape of a trapezoid rectangle and edge 3e, sheets of half-branch 3a.
  • the ignition coil may, depending on the required performance, such as for example a strong choke, have a magnetic circuit comprising either the air gap F or the air gap F ', or else comprise both the air gaps F and F'.
  • the particular configuration of the magnetic circuit, according to this second embodiment ensures that despite the use for reasons of economy and supply, permanent magnets of large surface area and low coercive field, the weight and size of the ignition coil have been reduced to the maximum compatible with the required performance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP81400073A 1980-02-20 1981-01-21 Bobine d'allumage pour moteurs à combustion interne Expired EP0034955B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8003653 1980-02-20
FR8003653A FR2476218A1 (fr) 1980-02-20 1980-02-20 Bobine d'allumage pour moteurs a combustion interne
FR8009742A FR2481753A2 (fr) 1980-04-30 1980-04-30 Bobine d'allumage pour moteurs a combustion interne
FR8009742 1980-04-30

Publications (2)

Publication Number Publication Date
EP0034955A1 EP0034955A1 (fr) 1981-09-02
EP0034955B1 true EP0034955B1 (fr) 1984-10-24

Family

ID=26221613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400073A Expired EP0034955B1 (fr) 1980-02-20 1981-01-21 Bobine d'allumage pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0034955B1 (es)
DE (1) DE3166748D1 (es)
ES (1) ES8200744A1 (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810625A1 (de) * 1988-03-29 1989-10-19 Vogt Electronic Ag Schaltnetztrafo
FR2778490B1 (fr) * 1998-05-11 2000-07-28 Sagem Bobine d'allumage pour moteur a combustion interne
FR2812024B1 (fr) * 2000-07-18 2003-04-04 Peugeot Citroen Automobiles Sa Actionneur de soupapes de moteurs a combustion interne
FR2812025B1 (fr) * 2000-07-20 2003-01-24 Peugeot Citroen Automobiles Sa Actionneur electromagnetique de soupape de moteur a combustion interne
FR2819623B1 (fr) * 2001-01-17 2003-07-04 Sagem Bobine d'allumage pour moteur a combustion interne
DE10159112A1 (de) * 2001-12-01 2003-06-18 Hella Kg Hueck & Co Zündtransformator für eine Gasentladungslampe in einem Kraftfahrzeug
FR2839580B1 (fr) * 2002-05-10 2008-08-22 Johnson Contr Automotive Elect Bobine d'allumage a aimant permanent a court-circuit magnetique
EP2001028B1 (en) * 2007-06-08 2016-11-23 ABB Technology Oy Protection of permanent magnets in a DC-inductor
US8289117B2 (en) * 2010-06-15 2012-10-16 Federal-Mogul Corporation Ignition coil with energy storage and transformation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1041524A (fr) * 1951-04-23 1953-10-23 Philips Nv Dispositif comportant un circuit ferromagnétique à prémagnétisation variable
FR1048081A (fr) * 1951-04-23 1953-12-18 Philips Nv Dispositif comportant un circuit ferromagnétique ferme par un corps magnétisant
FR66586E (fr) * 1954-06-16 1957-04-16 App Marchal Soc D Expl Const D Transformateur dit <<bobine>> d'allumage
DE1464202A1 (de) * 1962-02-23 1969-05-22 Licentia Gmbh Permanentvormagnetisiertes induktives Element
DE2226289A1 (de) * 1971-05-11 1973-01-04 Tdk Electronics Co Ltd Vormagnetisierter magnetkern

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2168919B3 (es) * 1972-01-26 1974-03-15 Ducellier & Cie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1041524A (fr) * 1951-04-23 1953-10-23 Philips Nv Dispositif comportant un circuit ferromagnétique à prémagnétisation variable
FR1048081A (fr) * 1951-04-23 1953-12-18 Philips Nv Dispositif comportant un circuit ferromagnétique ferme par un corps magnétisant
FR66586E (fr) * 1954-06-16 1957-04-16 App Marchal Soc D Expl Const D Transformateur dit <<bobine>> d'allumage
DE1464202A1 (de) * 1962-02-23 1969-05-22 Licentia Gmbh Permanentvormagnetisiertes induktives Element
DE2226289A1 (de) * 1971-05-11 1973-01-04 Tdk Electronics Co Ltd Vormagnetisierter magnetkern

Also Published As

Publication number Publication date
DE3166748D1 (en) 1984-11-29
ES499553A0 (es) 1981-12-01
EP0034955A1 (fr) 1981-09-02
ES8200744A1 (es) 1981-12-01

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