FR2476218A1 - IC engine ignition coil winding - is on magnetic circuit branch with junction inclined at angle to permanent magnet - Google Patents

IC engine ignition coil winding - is on magnetic circuit branch with junction inclined at angle to permanent magnet Download PDF

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Publication number
FR2476218A1
FR2476218A1 FR8003653A FR8003653A FR2476218A1 FR 2476218 A1 FR2476218 A1 FR 2476218A1 FR 8003653 A FR8003653 A FR 8003653A FR 8003653 A FR8003653 A FR 8003653A FR 2476218 A1 FR2476218 A1 FR 2476218A1
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FR
France
Prior art keywords
branch
permanent magnet
magnetic circuit
branches
circuit
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
FR8003653A
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French (fr)
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FR2476218B1 (en
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
Application filed by Ducellier et Cie filed Critical Ducellier et Cie
Priority to FR8003653A priority Critical patent/FR2476218A1/en
Priority to EP81400073A priority patent/EP0034955B1/en
Priority to DE8181400073T priority patent/DE3166748D1/en
Priority to ES499553A priority patent/ES499553A0/en
Publication of FR2476218A1 publication Critical patent/FR2476218A1/en
Application granted granted Critical
Publication of FR2476218B1 publication Critical patent/FR2476218B1/fr
Granted 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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • 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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

The device has a laminated closed magnetic circuit (1) containing a permanent magnet (2), with north and south-seeking poles adjacent to its larger faces (2a,2b), embedded in one branch (3). A prim. winding (4) and a sec. winding (5) surround a narrower branch (6) comprising part of the laminations which make up a half-branch (3a). The magnetic junction (7) at one end of that branch (6) forms an acute angle (alpha) with the plane of the permanent- magnet pole faces (2a,2b) adjacent to the half-branches (3a,3b). The latter are of unequal length so that some of their laminations cover the ends of the wound branch (6) on either side of the prim. and sec. windings. The permanent magnet has max. surface area in a magnetic circuit of reduce bulk and weight. The dimensions of the magnet do not depend on those of the wound branch. The angled magnetic junction at one end of the wound branch takes up the mfg. tolerances.

Description

Bobine d'allumaie pour moteur à combustion interne.Ignition coil for internal combustion engine.

La présente invention concerne une bobine d'allumage pour mo tueur à combustion interne, notamment de véhicule automobile, bobine comportant un circuit magnétique fermé consitué a une pluralité de tôles, circuit magnétique dans lequel est disposé dans l'une des branches un aimant permanent, un enroulement primaire et un enroulement secondaire entourant une autre des branches. The present invention relates to an ignition coil for an internal combustion killer, in particular for a motor vehicle, coil comprising a closed magnetic circuit made up of a plurality of sheets, magnetic circuit in which a permanent magnet is placed in one of the branches, a primary winding and a secondary winding surrounding another of the branches.

De telles bobines travaillant sur une grande partie du cycle d'hystérésis du circuit magnétique apportent une amélioration notable des caractéristiques par rapport aux bobines classiques à circuit ouvert qui n'utilisent qu'une portion du cycle. Such coils working on a large part of the hysteresis cycle of the magnetic circuit bring a significant improvement in characteristics compared to conventional open circuit coils which use only a portion of the cycle.

On connait un mode de réalisation d'une bobine à circuit magnétique fermé, mode de réalisation dans lequel un aimant permanent est disposé perpendiculairement aux flux circulant dans le circuit, l'aimant permanent étant aimanté dans le sens de son épaisseur de façon que le flux magnétique qu'il engendre soit opposé au flux produit par l'enroulement primaire lorsqu'il est alimenté. An embodiment of a coil with a closed magnetic circuit is known, an embodiment in which a permanent magnet is arranged perpendicular to the fluxes circulating in the circuit, the permanent magnet being magnetized in the direction of its thickness so that the flux magnetic that it generates is opposite to the flow produced by the primary winding when it is supplied.

Cet aimant permanent est situé dans la branche opposée à la branche entourée par les enraulements primaire et secondaire. This permanent magnet is located in the branch opposite to the branch surrounded by the primary and secondary hydraulics.

L'un des inconvénients de ce circuit constitué de deux pièces en forme de U disposées en regard, est que les dimensions de l'ai- mant permanent, hormis son épaisseur, sont fonction de la section du circuit magnétique. Ceci implique que tout accroissement du volume de l'aimant, dans le but de disposer d'un champ magnétique de l'aimant, plus important conduit à un accroissement de la sec tison du circuit donc à un accroissement de poids et de coût. One of the drawbacks of this circuit consisting of two U-shaped parts arranged facing each other, is that the dimensions of the permanent magnet, apart from its thickness, depend on the section of the magnetic circuit. This implies that any increase in the volume of the magnet, with the aim of having a magnetic field of the magnet, which is greater, leads to an increase in the sec tison of the circuit, therefore to an increase in weight and cost.

Un autre inconvénient de ce circuit est que les performances de la bobine sont conditionnees an partie, par la qualité du joint rnagnétique situé au centre de la branche entourée des enroulements primaire et secondaire et parallèlement au plan de joint aimant pen1ltnentXclrcuit magnétique
Cette qualité qui intervient dans la réluctance du circuit est dépendante des différences d'épaisseur de l'aimant permanent disposé a 1lGPPO9de la branche entourant les enroulements, lesquelles différences d'épaisseur sont inhérentes à toute fabrication de grande série. Another disadvantage 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 parallel to the magnetic joint plane pen1ltnentXclrcuit
This quality which intervenes in the reluctance of the circuit is dependent on the differences in thickness of the permanent magnet disposed at 1lGPPO9de the branch surrounding the windings, which differences in thickness are inherent in any mass production.

Dans ce mode de réalisation pour pallier cet inconvénient, des éléments ferro-magnétiques chevauchant ledit joint sont appliqués contre les pièces en U, mais ceci conduit à un accroissement du poids du cuivre constituant les enroulements, en raison du fait que l'on accroit ainsi la section de la branche sur laquelle sont disposés les enroulements. In this embodiment to overcome this drawback, ferromagnetic elements overlapping said seal are applied against the U-shaped parts, but this leads to an increase in the weight of the copper constituting the windings, due to the fact that it thus increases the section of the branch on which the windings are arranged.

La présente invention a pour but de remédier à ces inconvénients et concerne à cet effet une bobine d'allumage comportant un circuit magnétique, constitué d'une pluralité de tales, et un aimant permanent disposé dans l'une des branches dudit circuit, caractériséeen ce que ledit circuit comporte, au moins, un joint magnétique disposé selon un plan formant un angle aigu ttavec le plan des faces de l'aimant permanent adjacentes audit circuit. The object of the present invention is to remedy these drawbacks and to this end relates to an ignition coil comprising a magnetic circuit, consisting of a plurality of blades, and a permanent magnet disposed in one of the branches of said circuit, characterized in that that said circuit comprises, at least, a magnetic seal arranged along a plane forming an acute angle ttwith the plane of the faces of the permanent magnet adjacent to said circuit.

Selon l'invention la branche sur laquelle sont disposés l'en- roulement primaire et l'enroulement secondaire est d'épaisseur inférieure à l'épaisseur des autres branches du circuit magnétique. According to the invention, the branch on which the primary winding and the secondary winding are arranged is of thickness less than the thickness of the other branches of the magnetic circuit.

Au moins un joint magnétique est disposé à 11 une des extrémités de la branche entourée des enroulements primaire et secon dire.  At least one magnetic seal is placed at one of the ends of the branch surrounded by the primary and second windings.

La branche dans laquelle est situé l'aimant permanent est composee de demi-branches dont les parties adjacentes à l'aimant ont, selon le plan des tales qui composent lesdites demi-branches, la forme d'un trapèze rectangle. The branch in which the permanent magnet is located is made up of half-branches, the parts of which adjacent to the magnet have, in the plane of the tales which make up said half-branches, the shape of a rectangular trapezoid.

Un fraction des tôles, constituant les demi-branches recouvre de part et d'autre des enroulements, les extrémités de la branche sur laquelle sont disposés ies enroulements. A fraction of the sheets, constituting the half-branches covers on either side of the windings, the ends of the branch on which the windings are arranged.

La description qui va suivre en regard des dessins annexés, donnés à titre d'exemple non limitatif, fera mieux comprendre comment L'invention peut etre réalisée. The description which follows with reference to the appended drawings, given by way of nonlimiting example, will make it easier to understand how the invention can be implemented.

La figure 1 est une vue de dessus en coupe partielle d'une bobine d'allumage selon 11 invention.  Figure 1 is a top view in partial section of an ignition coil according to the invention.

La figure 2 est une vue de côté de cette bobine. Figure 2 is a side view of this coil.

Selon un mode de réalisation préféré de l'invention, la bobine d'allumage selon l'invention (voir figure 1) comporte un circuit magnétique fermé 1, constitué d'une pluralité de tales. Un aimant permanent 2, aimanté dans le sens de son épais saut est disposé dans une branche 3 dudit circuit 1.  According to a preferred 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 blades. A permanent magnet 2, magnetized in the direction of its thick jump is placed in a branch 3 of said circuit 1.

Un enroulement primaire 4 et un enroulement secondaire 5 entourent la branche 6 laquelle branche 6 est dans cet exemple de réalisation, constitué d'une fraction des tales constituant la demi-branche 3a, formant avec la demi-branche 3b la branche 3. A primary winding 4 and a secondary winding 5 surround the branch 6 which branch 6 is in this embodiment, consisting of a fraction of the tales constituting the half-branch 3a, forming with the half-branch 3b the branch 3.

L'épaisseur E' de la bronche 6 (voir figure 2) est, dans cet exemple de réalisation inférieure de deux fois environ à l'épaissaur E de la branche 3. The thickness E ′ of the bronchus 6 (see FIG. 2) is, in this exemplary embodiment, approximately twice less than the thickness E of the branch 3.

Un joint magnétique 7 (voir figure 1) est prévu à l'une des extrémités de la branche 6, lequel joint 7 est disposé selon un plan formant un angle aigu eR avec le plan des faces 2a et 2b de l'aimant permanent 2 adjacentes aux demi-bronches 3a et 3b. A magnetic seal 7 (see FIG. 1) is provided at one end of the branch 6, which seal 7 is arranged in a plane forming an acute angle eR with the plane of the adjacent faces 2a and 2b of the permanent magnet 2 to the half-bronchi 3a and 3b.

Les demi branches 3a et 3b ont en vue de dessus (voir fig.l) l'allure d'un trapèze rectangle dans leurs parties adjacentes aux faces 2a et 2b de l'aimant permanent. The half branches 3a and 3b have a top view (see fig.l) the shape of a rectangular trapezoid in their parts adjacent to the faces 2a and 2b of the permanent magnet.

Conformément à l'invention les demi-branches 3a et 3b sont consituées de tôles d'inégales longueurs ,.t *.;;; ;.  In accordance with the invention, the half-branches 3a and 3b are made up of sheets of unequal length, .t *. ;;; ;.

de manière qu'une fraction de ces tales recouvre, de part et d'autre des enroulements primaire 4 et secondaire 5, les extrémités de la branche 6. so that a fraction of these tales covers, on either side of the primary 4 and secondary 5 windings, the ends of the branch 6.

De par sa configuration particulière, telle que l'on vient de la décrire, ce circuit magnétique permet d'éliminer les inconvénients cités de l'art antérieur, par le fait qu'il est prévu un aimant permanent de grande surface dans un circuit magnétique dont le poids et l'encombrement ont été réduits au maximum,compatibles avec les performances de la bobine d'allumage. Due to its particular configuration, as just described, 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.

D'autre part la forte épaisseur E des demi branches dans lesquelles est disposé l'aimant permanent autorise une réduction importante du périmètre du circuit magnétique et corrélativement un encombrement réduit de la bobine d'allumage. On the other hand 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.

De même il n'y a plus dépendance entre les dimensions de l'aimant et les dimensions de la branche entourée par les enroulements primaire et secondaire. Similarly, there is no longer any dependence between the dimensions of the magnet and the dimensions of the branch surrounded by the primary and secondary windings.

Enfin le joint magnétique situé à l'une des extrémités de la branche entourée par les enroulements primaire et secondaire, et formant un angle aigutt avec le plan des faces adjacentes à l'aimont permanent absorbe les différences d'épaisseur de l'aimant permanent dues aux tolérances de fabrication: et également les tolérances de découpage des tôles constituant le circuit magnétique.  Finally the magnetic seal located at one end of the branch surrounded by the primary and secondary windings, and forming a sharp angle with the plane of the faces adjacent to the permanent magnet absorbs the differences in thickness of the permanent magnet due manufacturing tolerances: and also the cutting tolerances of the sheets constituting the magnetic circuit.

Claims (5)

R E V E N D I C A T I O N S REVE NDlCATl o SR E V E N D I C A T I O N S REVE NDlCATl o S 1.- Bobine d'allumage pour moteurs à combustion interne, bobine comportant un circuit magnétique fermé constitué d'une pluralité de tôles, un aimant permanent disposé dans l'une des branches dudit circuit, un enroulement primaire et un enroulement secondaire entourant une autre des branches, cara,ctérisée en ce que le circuit magnétique (1) comporte au-moins un joint magnétique (7) disposé selon un plan formant un angle aigu t avec le plan des faces (2a et 2b) de l'aimant permanent (2) adjacentes audit circuit(17.  1.- Ignition coil for internal combustion engines, coil comprising a closed magnetic circuit consisting of a plurality of sheets, a permanent magnet disposed in one of the branches of said circuit, a primary winding and a secondary winding surrounding another branches, cara, ctérisée in that the magnetic circuit (1) comprises at least one magnetic seal (7) arranged in a plane forming an acute angle t with the plane of the faces (2a and 2b) of the permanent magnet ( 2) adjacent to said circuit (17. 2. Bobine selon la revendication 1, caractérisée en ce que la branche (6) sur laquelle sont disposés l'enroulement primaire (4) et l'enroulement secondaire (5) est d'épaisseur E' inférieure à l'épaisseur E de la branche (3) du circuit magnétique. 2. Coil according to claim 1, characterized in that the branch (6) on which the primary winding (4) and the secondary winding (5) are arranged is of thickness E 'less than the thickness E of the branch (3) of the magnetic circuit. 3.- Bobine selon l'une des revendications 1 et 2,caractérisée en ce que le joint magnétique (7) est disposé à l'une des extrémités de la branche (6) sur laquelle sont disposés l'enroulement primaire (4) et l'enroulement secondaire (5),  3.- Coil according to one of claims 1 and 2, characterized in that the magnetic seal (7) is disposed at one end of the branch (6) on which are disposed the primary winding (4) and the secondary winding (5), 4.- Bobine selon l'une des revendications 1,2,3, caractérisée en ce que la branche(3) dans laquelle est disposé l'aimant permanent est composée de demi-branches (3a, -3b) dont les parties adjacentes à l'aimant permanent (2) ont, selon le plan des tôles qui composent lesdites demi-branches, la forme d'un trapèze rectangle. 4.- Coil according to one of claims 1,2,3, characterized in that the branch (3) in which is placed the permanent magnet is composed of half-branches (3a, -3b) whose parts adjacent to the permanent magnet (2) have, in the plane of the sheets which make up said half-branches, the shape of a rectangular trapezoid. 5.- Bobine selon les revendications 2 et 4, caractérisée en ce qu'une fraction des tôles constituant les demi-branches (3a et recouvre, de part et d'autre des enroulements primaires (4) et secondaire (5), les extrémités de la branche (6) sur laquelle sont disposés lesdits enroulements0  5.- Coil according to claims 2 and 4, characterized in that a fraction of the sheets constituting the half-branches (3a and covers, on either side of the primary windings (4) and secondary (5), the ends of the branch (6) on which said windings are arranged0
FR8003653A 1980-02-20 1980-02-20 IC engine ignition coil winding - is on magnetic circuit branch with junction inclined at angle to permanent magnet Granted FR2476218A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR8003653A FR2476218A1 (en) 1980-02-20 1980-02-20 IC engine ignition coil winding - is on magnetic circuit branch with junction inclined at angle to permanent magnet
EP81400073A EP0034955B1 (en) 1980-02-20 1981-01-21 Ignition coil for internal-combustion engines
DE8181400073T DE3166748D1 (en) 1980-02-20 1981-01-21 Ignition coil for internal-combustion engines
ES499553A ES499553A0 (en) 1980-02-20 1981-02-18 IMPROVEMENTS IN IGNITION SYSTEMS FOR ENGINES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8003653A FR2476218A1 (en) 1980-02-20 1980-02-20 IC engine ignition coil winding - is on magnetic circuit branch with junction inclined at angle to permanent magnet

Publications (2)

Publication Number Publication Date
FR2476218A1 true FR2476218A1 (en) 1981-08-21
FR2476218B1 FR2476218B1 (en) 1984-10-19

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FR8003653A Granted FR2476218A1 (en) 1980-02-20 1980-02-20 IC engine ignition coil winding - is on magnetic circuit branch with junction inclined at angle to permanent magnet

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FR (1) FR2476218A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2531751A1 (en) * 1982-08-11 1984-02-17 Ducellier & Cie IGNITION COIL FOR INTERNAL COMBUSTION ENGINE

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1048081A (en) * 1951-04-23 1953-12-18 Philips Nv Device comprising a ferromagnetic circuit closed by a magnetizing body
FR66586E (en) * 1954-06-16 1957-04-16 App Marchal Soc D Expl Const D Transformer called ignition <<coil>>
FR1251026A (en) * 1959-03-13 1961-01-13 Ignition coil
DE1464202A1 (en) * 1962-02-23 1969-05-22 Licentia Gmbh Permanently biased inductive element
FR2168919A3 (en) * 1972-01-26 1973-09-07 Ducellier & Cie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1048081A (en) * 1951-04-23 1953-12-18 Philips Nv Device comprising a ferromagnetic circuit closed by a magnetizing body
FR66586E (en) * 1954-06-16 1957-04-16 App Marchal Soc D Expl Const D Transformer called ignition <<coil>>
FR1251026A (en) * 1959-03-13 1961-01-13 Ignition coil
DE1464202A1 (en) * 1962-02-23 1969-05-22 Licentia Gmbh Permanently biased inductive element
FR2168919A3 (en) * 1972-01-26 1973-09-07 Ducellier & Cie

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2531751A1 (en) * 1982-08-11 1984-02-17 Ducellier & Cie IGNITION COIL FOR INTERNAL COMBUSTION ENGINE
WO1984000843A1 (en) * 1982-08-11 1984-03-01 Ducellier & Cie Ignition coil for internal combustion engines
US4546753A (en) * 1982-08-11 1985-10-15 Ducellier & Cie Ignition coil for internal combustion engines

Also Published As

Publication number Publication date
FR2476218B1 (en) 1984-10-19

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