EP0230811B1 - Zündspule mit geschlossenem magnetischem Kreis - Google Patents

Zündspule mit geschlossenem magnetischem Kreis Download PDF

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Publication number
EP0230811B1
EP0230811B1 EP19860402744 EP86402744A EP0230811B1 EP 0230811 B1 EP0230811 B1 EP 0230811B1 EP 19860402744 EP19860402744 EP 19860402744 EP 86402744 A EP86402744 A EP 86402744A EP 0230811 B1 EP0230811 B1 EP 0230811B1
Authority
EP
European Patent Office
Prior art keywords
ignition coil
winding
finger members
primary
primary winding
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 - Lifetime
Application number
EP19860402744
Other languages
English (en)
French (fr)
Other versions
EP0230811A2 (de
EP0230811A3 (en
Inventor
Francis Savelli
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.)
Valeo Electronique SA
Original Assignee
Valeo Electronique 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
Priority claimed from FR8601004A external-priority patent/FR2593962B1/fr
Priority claimed from FR8610663A external-priority patent/FR2602087B2/fr
Application filed by Valeo Electronique SA filed Critical Valeo Electronique SA
Publication of EP0230811A2 publication Critical patent/EP0230811A2/de
Publication of EP0230811A3 publication Critical patent/EP0230811A3/fr
Application granted granted Critical
Publication of EP0230811B1 publication Critical patent/EP0230811B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • 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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/025—Coils wound on non-magnetic supports, e.g. formers wound on coaxial arrangement of two or more formers

Definitions

  • the present invention relates to an ignition coil in particular for an internal combustion engine of a motor vehicle of the type comprising a generally laminated magnetic circuit consisting of a central core and a magnetic flux return circuit and several windings, one primary or inductor, the other secondary or induced, if it is an ignition coil with one or more outputs.
  • One of the terminals of the primary winding is connected to the direct current source of the motor vehicle, while the other is connected to mechanical or electronic switching means, such as, for example, breakers or transistors.
  • the voltage variations caused by power cuts to the primary winding cause flux variations in the magnetic circuit, which themselves induce a voltage in the secondary winding.
  • This secondary winding comprises a very high number of turns, which has the effect of obtaining in the secondary circuit a very high voltage, of the order of several thousand volts, making it possible to generate an electric arc at the electrodes of the spark plugs, igniting the oxidizing mixture contained in the cylinders of the engine block.
  • These ignition coils are of the central magnetic core type around which the primary and secondary windings are coaxially arranged, that is to say that the central magnetic core is housed inside the tubular hub of the coil carrying the winding.
  • primary said primary winding being housed itself inside the tubular hub of the coil carrying the secondary winding, the whole being housed in a housing produced by molding of plastic material.
  • Document DE-A-3 048 803 also discloses an ignition coil in which the coil of the secondary winding is fixed to the coil of the primary winding by holding means constituted by parts of rings formed at the ends axial of the winding of the primary winding.
  • the ignition coil which is the subject of the invention, with a closed circuit, consisting of a central core around which the primary and secondary windings are coaxially arranged, and of a magnetic flux return circuit, said windings being housed in a housing.
  • said reel comprising holding means capable of holding the secondary winding on and around the primary winding, and being characterized in that said holding means are formed in the middle part of the reel , said holding means defining a substantially maximum space at all points, in a given space, between said winding and the magnetic circuit.
  • the means for holding in lift consist of a plurality of radial fingers formed in one material with one of the coils and cooperate with cavities formed on the other coil, cavities in which said fingers are anchored.
  • the radial fingers are advantageously arranged approximately at middle of the edges of the tubular hub of the winding of the primary winding of apparent quadrangular section, formed on the tubular hub of the winding of the primary winding and protrude relative to the outside diameter of said winding.
  • the cavities in which the radial fingers are anchored are delimited by an elastically deformable wall.
  • the holding means comprise elastic tongues inclined alternately in symmetrically opposite directions, the distance "E" between the bearing ends of two consecutive tongues being approximately equal to the thickness " E1 "from the ends of the radial fingers.
  • Another embodiment consists in providing elastically deformable radial fingers.
  • the ignition coil represented in FIG. 1 has a central core 1, and a double magnetic flux return circuit 2 composed of two branches 3 and 4 in the shape of a U.
  • a useful air gap 6 is formed between the central magnetic core 1 and the double magnetic flux return circuit 2. This air gap 6 prevents temporary or permanent saturation of the magnetic circuit and reduces the inductance of the secondary circuit.
  • the joint planes of the two magnetic flux return circuits 3 and 4 are on the neutral line 7 of the magnetic circuit, where the magnetic flux is zero. Consequently, the parasitic air gaps formed by the junction of the two circuits magnetic return flow 3 and 4 in no way affect the proper functioning of the magnetic circuit.
  • indexing means 5 prevent the two branches 3 and 4 of the magnetic flux return circuit 2 from shifting one relative to the other, and, consequently, the air gap 6 would no longer be equal value in all its points. Indeed, the air gap 6 would have a different value between the central core 1 and the branch 3, and, between said central core 1 and the branch 4. This difference is in no way negligible compared to the value of the air gap 6 which is very weak.
  • a primary coil consisting of a plastic coil 10 and a wire 11 wound on said plastic coil 10 is arranged around the central core 1.
  • a secondary coil consists of a plastic coil 20 and a wire 21 wound around said plastic winding 20. The high voltage part of the winding 21 located near the end 20 a of the plastic winding 20, is held in lift around the primary winding 10.
  • the secondary coil 21 must be at a sufficient space from all metallic masses in order to avoid the ignition of an electric arc which would lead to a partial or total destruction of the ignition coil, rendering it unusable.
  • the secondary spool 20 is held in lift around the primary spool 10 by means of radial fingers 12 made integrally with the spool 10 and projecting with respect to the primary winding 11. These radial fingers 12 cooperate with latching means 13 formed on the secondary spool 20. These holding means are shown on a larger scale in FIG. 2.
  • a metal part 8 is molded so as to conform to the external shape of said magnetic flux return circuit 2 and comprises, when molded in, cooling ribs 19, increasing the surface of the metal part 8 in contact with the air thus favoring better heat exchange with it.
  • Fastening lugs 8 has integrally molded with said metal piece 8 is in contact with the metal support on which said ignition coil is fixed.
  • a plastic casing 30 is molded onto said metal part 8 and onto the secondary coil, thus improving the aesthetics of the ignition coil by preventing the magnetic circuit 2 from oxidizing.
  • resin 32 is poured, having the property of electrically isolating the various elements from one another and of joining them in the position which was initially given to them.
  • FIG. 3 shows in perspective the plastic spool 10 provided with its radial fingers 12.
  • Two slots 13 are provided on one of the blanks 19 of the spool, in order to accommodate the two ends of the wire constituting the primary winding 11.
  • FIG. 4 shows the same bobbin as that shown in FIG. 3, the radial fingers 12 being placed on the edges formed by the faces 10 a . Indeed, if the radial fingers 12 are placed on each of the 10 ′ faces of the spool 10, it turns out to be necessary to mold it using a mold with four drawers. If the radial fingers 12 are placed on the edge formed by the faces 10 a (as shown in FIG. 4), the mold necessary for the manufacture of the plastic reel 10 will have only two drawers, which will allow manufacturing at lower cost.
  • the cavities in which the radial fingers 12 are anchored are delimited by elastically deformable tongues 22 a and 22 b and are arranged opposite said radial fingers 12
  • the wire constituting the secondary winding 21 is wound before assembly, around the bobbin 20, one end 27 of the secondary winding 21 being connected to the plug 17 of the primary connector 14, the other end 28 of the wire constituting the secondary winding 21, being connected to the secondary output 24 of the ignition coil, by welding to the base of the metal spindle 25.
  • An appendix 23 forming an integral part of the secondary winding 20 serves as a support for fixing to the plastic chimney 26 of the secondary outlet 24.
  • Said support 23 of the chimney 26, like the means for holding in lift of the secondary reel 20 on and around the primary reel 10 fulfill their functions of provisional holding before casting the synthetic resin 32 inside a housing 30 produced by molding of plastic material, the housing 30 in which is placed the magnetic circuit-windings. After hardening of the synthetic resin 32, all the elements constituting the ignition coil are joined and electrically isolated from each other.
  • the housing being closed with a cover 33.
  • the primary connector 14 can be located, as desired by motor vehicle manufacturers, either on the upper part of the ignition coil, or on its lower part.
  • the high voltage output 24 must in all cases be located on the upper part of the ignition coil.
  • the elastically deformable tongues 22 a and 22 b are alternately directed in an opposite direction as shown in FIG. 6.
  • the distance "E” between the support ends of two successive elastic tongues 22 a and 22 b therefore in opposite directions, must be approximately equal to the thickness "E1" of the end of said fingers 12.
  • said fingers 12 snap between the ends of the tongues 22 a directed towards the bottom of the ignition coil and between the ends of the tabs 22 b directed towards the top of the ignition coil, defining the thickness "E".
  • the primary connector 14 is located on the lower part of the ignition coil.
  • the secondary winding 20 must therefore be mounted on and around the primary winding 10 by engaging said secondary winding 20 by its lower part.
  • the radial fingers 12 first come into contact with the tabs 22 b directed upwards.
  • These tabs 22 b retract elastically as the fingers 12 of the secondary coil 20 pass, which radial fingers 12 then come to bear against the elastic tabs 22 a directed downwards from the ignition coil.
  • the secondary spool 20 is thus maintained levitated on and around the primary spool 10 by the resilient tongues 22 has downwardly directed to the ignition coil, which bear on the radial fingers 12.
  • the embodiment shown in FIG. 7 essentially differs from the previous one in that the secondary coil 20 having to be mounted, in this case, on and around the primary coil 10 by engagement of said secondary coil 20 through its upper part.
  • Radial fingers 12 are initially in contact with the tabs 22 a downwardly directed. These tabs 22 a retract elastically with the passage of the fingers 12 of the secondary coil 20, which radial fingers 12 then come to bear against the elastic tabs 22 b directed towards the top of the ignition coil.
  • the elastic tabs 22 b directed towards the top of the ignition coil prevent any possible translation of the secondary coil 20 towards the upper part of the ignition coil during the pouring of the synthetic resin 32.
  • the radial fingers 12 can also be placed on the reel 20, while the elastic snap-fastening means 13 would be placed on the reel 10.
  • the radial fingers 12 could be elastic and snap into cavities provided on the other spool.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (8)

  1. Zündspule, insbesondere für einen Kraftfahrzeugverbrennungsmotor, mit in sich geschlossenem Stromkreis, bestehend aus einem zentralen Kern (1), um welchen herum koaxial die Primär- (11) und die Sekundärwicklung (21) angeordnet sind, und aus einem Rückfluß-Magnetkreis (2), wobei die genannten Wicklungen (11) und (21) in einem aus Kunststoff geformten Gehäuse (30) untergebracht sind, wobei die genannte Spule Haltevorrichtungen (12, 22a, 22b) umfaßt, welche geeignet sind, die Sekundärwicklung (21) auf der Primärwicklung (11) und um diese herum schwebend zu halten, und dadurch gekennzeichnet, daß die genannten Haltevorrichtungen (12, 22a, 22b) in den Mittelteil der Spule geformt sind, wobei die genannten Haltevorrichtungen (12, 22a, 22b) einen an allen Punkten merklich maximalen Platz in einem gegebenen Raum zwischen den genannten Wicklungen und dem Magnetkreis begrenzen.
  2. Zündspule gemäß Anspruch 1, dadurch gekennzeichnet, daS die Haltevorrichtungen aus einer Vielzahl radial angeordneter Finger (12) bestehen, die aus einem Stück mit einer der Spulen (10) oder (20) der Primär- (11) oder Sekundärwicklung (21) bestehen und mit in die andere Spule (10) oder (20) eingebrachten Vertiefungen zusammenwirken, Vertiefungen, in welchen sich die Enden der genannten Finger (12) elastisch festankern.
  3. Zündspule gemäß Anspruch 2, dadurch gekennzeichnet, daS die Radialfinger (12) auf der röhrenförmigen Habe der Spule (10) der Primärwicklung (11) angebracht sind und in Bezug auf den Außendurchmesser der genannten Wicklung (11) hervorstehen.
  4. Zündspule gemäß Anspruch 2, dadurch gekennzeichnet, daß die Vertiefungen durch eine elastisch verformbare Wand begrenzt werden.
  5. Zündspule gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Haltevorrichtungen aus einer Vielzahl radial angeordneter Finger (12) bestehen, die aus einem Stück mit einer der Spulen (10 oder 20) der Primär(11) oder Sekundärwicklung (21) bestehen und mit elastischen Zungen (22a) und (22b) zusammenwirken, welche abwechselnd in symmetrisch entgegengesetzten Richtungen geneigt sind, wobei die Entfernung "E" zwischen den Auflageenden von zwei aufeinanderfolgenden Zungen (22a) und (22b) annähernd gleich der Stärke "E1" der Enden der Radialfinger (12) ist.
  6. Zündspule gemäß Anspruch 4, dadurch gekennzeichnet, daß die Radialfinger (12) elastisch verformbar sind.
  7. Zündspule gemäß Anspruch 4, dadurch gekennzeichnet, daß die Radialfinger (12) annähernd in der Mitte der Außenflächen (10a) der röhrenförmigen Nabe der Spule (10) der Primärwicklung (11) mit viereckigem Querschnitt angeordnet sind.
  8. Zündspule gemäß Anspruch 4, dadurch gekennzeichnet, daß die Radialfinger (12) annähernd in der Mitte der Kanten der röhrenförmigen Nabe der Primärspule (10) der Primärwicklung (11) mit viereckigem Querschnitt angeordnet sind.
EP19860402744 1986-01-24 1986-12-10 Zündspule mit geschlossenem magnetischem Kreis Expired - Lifetime EP0230811B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8601004A FR2593962B1 (fr) 1986-01-24 1986-01-24 Bobine d'allumage a circuit ferme
FR8601004 1986-01-24
FR8610663A FR2602087B2 (fr) 1986-07-23 1986-07-23 Bobine d'allumage a circuit ferme
FR8610663 1986-07-23

Publications (3)

Publication Number Publication Date
EP0230811A2 EP0230811A2 (de) 1987-08-05
EP0230811A3 EP0230811A3 (en) 1988-07-27
EP0230811B1 true EP0230811B1 (de) 1992-06-03

Family

ID=26224984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860402744 Expired - Lifetime EP0230811B1 (de) 1986-01-24 1986-12-10 Zündspule mit geschlossenem magnetischem Kreis

Country Status (4)

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EP (1) EP0230811B1 (de)
BR (1) BR8700210A (de)
DE (1) DE3685573T2 (de)
ES (1) ES2033689T3 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3619984A1 (de) * 1986-06-13 1987-12-17 Bosch Gmbh Robert Zuendspule fuer zuendanlagen von brennkraftmaschinen
DE3741033A1 (de) * 1987-12-03 1989-06-15 Mitsubishi Electric Corp Hochspannungstransformator und verfahren zu seiner herstellung
FR2646550B1 (fr) * 1989-04-28 1994-03-04 Marchal Equip Automobiles Bobine d'allumage, en particulier pour moteur a combustion interne de vehicule automobile, et moyens de maintien de l'ensemble primaire dans le secondaire
DE4200821A1 (de) * 1992-01-15 1993-07-22 Bayer Ag Geschmacksmaskierte pharmazeutische mittel
IT1261293B (it) * 1993-03-24 1996-05-09 Magneti Marelli Spa Bobina di accensione e procedimento per la sua fabbricazione
JP3453792B2 (ja) * 1993-07-09 2003-10-06 三菱電機株式会社 内燃機関用点火コイル
EP1530225A3 (de) * 2003-11-06 2008-08-06 Tyco Electronics Belgium EC N.V. Elektrische Spulenanordnung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798060A (en) * 1928-08-09 1931-03-24 Scintilla Ag Ignition coil for battery-ignition apparatus
DE1029412B (de) * 1956-08-17 1958-05-08 Telefunken Gmbh Hochspannungstransformator fuer Fernsehempfaenger
JPS5693309A (en) * 1979-12-26 1981-07-28 Nippon Denso Co Ltd High-tension coil
FR2529375A1 (fr) * 1982-06-23 1983-12-30 Legrand Sa Dispositif electromagnetique tel que transformateur electrique, du genre comportant une carcasse en deux parties

Also Published As

Publication number Publication date
EP0230811A2 (de) 1987-08-05
DE3685573D1 (de) 1992-07-09
ES2033689T3 (es) 1993-04-01
BR8700210A (pt) 1987-12-01
EP0230811A3 (en) 1988-07-27
DE3685573T2 (de) 1993-02-04

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