EP0617438A1 - Zündspule und Verfahren zu ihrer Herstellung - Google Patents

Zündspule und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0617438A1
EP0617438A1 EP94104250A EP94104250A EP0617438A1 EP 0617438 A1 EP0617438 A1 EP 0617438A1 EP 94104250 A EP94104250 A EP 94104250A EP 94104250 A EP94104250 A EP 94104250A EP 0617438 A1 EP0617438 A1 EP 0617438A1
Authority
EP
European Patent Office
Prior art keywords
container
bobbin
insulating material
electrical
magnetic core
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.)
Withdrawn
Application number
EP94104250A
Other languages
English (en)
French (fr)
Inventor
Alessandro Leone
Francesco Morini
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.)
Industrie Magneti Marelli SRL
Marelli Europe SpA
Original Assignee
Industrie Magneti Marelli SRL
Magneti Marelli SpA
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 Industrie Magneti Marelli SRL, Magneti Marelli SpA filed Critical Industrie Magneti Marelli SRL
Publication of EP0617438A1 publication Critical patent/EP0617438A1/de
Withdrawn legal-status Critical Current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
    • 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
    • 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 use, in particular, in an internal combustion engine having an ignition system with electronic distribution.
  • the invention relates to an ignition coil of the so-called "plug-top” type, that is, the type which is intended to be mounted directly on a respective spark plug and which comprises a substantially tank-shaped insulating container in which coaxial primary and secondary windings are supported, the empty spaces in the container being filled with an electrically insulating material which is poured therein in the liquid state and then hardened, and a magnetic core having at least one arm extending through the primary and secondary windings.
  • plug-top the type which is intended to be mounted directly on a respective spark plug and which comprises a substantially tank-shaped insulating container in which coaxial primary and secondary windings are supported, the empty spaces in the container being filled with an electrically insulating material which is poured therein in the liquid state and then hardened, and a magnetic core having at least one arm extending through the primary and secondary windings.
  • Coils of this type have the disadvantage that they have insufficient protection for the plates of the magnetic cores, since these are disposed outside the container. For this reason, the pack of plates of the magnetic core is subject to corrosion and may have the typical noisiness of magnetic cores of this type.
  • the object of the present invention is to provide a coil which enables all the problems indicated above to be solved in a satisfactory manner.
  • this object is achieved by virtue of an ignition coil, characterized in that the container and the magnetic core are substantially covered by a second insulating material which is applied in the liquid state and then hardened.
  • An ignition coil formed according to the present invention can pass a salt-fog resistance test (400 hours) and at the same time is less noisy than the coils normally produced.
  • the reduction in components and the manufacturing method of the present invention enable an ignition coil of low cost and complexity to be produced.
  • Figures 1 and 2 show a support element 1 which is made of insulating material and is intended to house the bobbins of the windings, and which terminates in a high-tension conduit for connection to a plug.
  • the high-tension socket 2 a diode 10 with a lead forced into the high-tension socket 2, a seat 10c for a flange of the primary bobbin and two cradle-like supports 10a and 10b for the secondary winding bobbin can be distinguished.
  • Figure 3 shows the bobbin 3 of the primary winding 12c, this bobbin also being made of insulating material, for example, plastics material.
  • the two ends of the winding 12c are connected to two metal electrical supply terminals 12 and 13 fixed to a flange 14 of the primary bobbin 3.
  • the supply terminals 12 and 13 may be fixed by the hot upsetting of four pins projecting from the flange 14 or of the edges of a seat, also formed on the flange 14.
  • the terminals 12 and 13 also have two regions 12a, 13a (visible in Figure 5) which project from the plastics material of the flange 14 so that the electrical or ultrasound welding to the terminals 12b and 13b of the primary winding 12c can be carried out.
  • Three holes 14a, 14b and 14c are also formed in the flange 14 and serve for the oriented fitting of the bobbin 4 carrying the secondary winding 4a.
  • a wire for connecting the pack of plates constituting the magnetic core 7 to earth may also be welded to the negative terminal, for example, the terminal 12a.
  • Figure 4 shows the bobbin 3 of the primary winding 12c on which the bobbin 4 of the secondary winding 4a is fitted.
  • the secondary winding 4a has two electrical terminals 16 and 17; the terminal 16 is fixed to the negative terminal 12 of the primary winding 12c by electrical welding after the three pins 15a, 15b and 15c of the bobbin 4 of the secondary winding 4a have been force-fitted in an oriented manner in the respective holes 14a, 14b and 14c of the flange 14 of the bobbin 3 of the primary winding 12c.
  • Figure 6 shows the primary and secondary bobbins 3, 4 fitted on the support element 1.
  • the flange 14 of the primary bobbin 3 is force-fitted in the seat 10c of the support element 1 and the flanges 17a and 17b of the secondary bobbin 4 bear on the cradle-like seats 10a and 10b of the support element 1.
  • the remaining free lead of the diode 10 is electrically or ultrasonically welded to the remaining free high-tension terminal 17 of the secondary winding 4a.
  • Figure 7 is a side view of the assembly of Figure 6 in which the square-sectioned hole 26 for housing the central portion of the magnetic core 7 of the coil can be noted.
  • Figure 8 shows the magnetic core 7 constituted by two preassembled and substantially "E"-shaped half-packs of plates 24 and 25.
  • Figures 9 and 10 show the assembly of Figure 7 inserted in a container 5 and subsequently completed by the magnetic core 7.
  • the container 5 has a circular groove 19 which engages the toroidal portion 18 of the support element 1, and grooves 21a and 21b with horizontal axes which engage homologous toroidal projections 20a and 20b of the primary bobbin 3 (visible in Figure 10).
  • These toroidal portions 18, 20a, 20b and the corresponding grooves 19, 21a, 21b ensure that there is no leakage to the exterior during the pouring of the resin into the container 5, which operation will be described below.
  • the container 5 and the primary bobbin 3 may also be connected by ultrasound welding.
  • the upper edge 22 of the container 5 reaches the level of the upper edge 23 of the flange 14 of the primary bobbin 3.
  • the magnetic core 7 is formed by fitting the two preassembled half-packs of plates 24 and 25 together.
  • the central portions 28 of the half-packs 24 and 25 are fitted symmetrically and with slight interference in the seat 26 in the primary bobbin 3.
  • the half-packs 24 and 25 are kept with their ends pressed against each other and are joined in the regions 27 of the outer arms which are in contact by TIG or laser welding.
  • the half-packs 24 and 25 also have two holes 29 and 30 in diagonally opposite positions for the mounting of the coil on the internal combustion engine.
  • the container 5 is then filled with two-part epoxy resin which, after polymerization, forms a single insulating block which also protects the primary and secondary windings from moisture and other atmospheric agents.
  • Figures 11 and 12 show the complete coil B constituted by the assembly shown in Figures 9 and 10, covered with resin R (for example, PBT filled with elastomers).
  • resin R for example, PBT filled with elastomers.
  • the terminals 12 and 13 of the coil B and the points 29 and 30 for attachment to the internal combustion engine are protected by the resin covering R.
  • This covering is formed with the use of a die, the cavity of which follows the external surface of the coil, leaving a space of about 1 mm.
  • the die can form the cable terminal 31 for the terminals 12 and 13 which is thus integral with the covering.
  • Figure 13 shows an alternative embodiment of the assembly of Figures 4 and 5 which has a further high-tension output 32 fixed to a bracket 33 which engages the flange 17a of the bobbin 4 and the flange 14 of the bobbin 3.
  • the high-tension output 32 has a high-tension socket and a diode similar to the high-tension socket 2 and the diode 10 of the support element 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Insulating Of Coils (AREA)
EP94104250A 1993-03-24 1994-03-18 Zündspule und Verfahren zu ihrer Herstellung Withdrawn EP0617438A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930200 1993-03-24
ITTO930200A IT1261293B (it) 1993-03-24 1993-03-24 Bobina di accensione e procedimento per la sua fabbricazione

Publications (1)

Publication Number Publication Date
EP0617438A1 true EP0617438A1 (de) 1994-09-28

Family

ID=11411297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94104250A Withdrawn EP0617438A1 (de) 1993-03-24 1994-03-18 Zündspule und Verfahren zu ihrer Herstellung

Country Status (2)

Country Link
EP (1) EP0617438A1 (de)
IT (1) IT1261293B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105144318A (zh) * 2013-04-10 2015-12-09 金刚石电机株式会社 点火线圈

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195811A (ja) * 1983-04-20 1984-11-07 Nippon Denso Co Ltd 内燃機関用同時点火コイル
EP0230811A2 (de) * 1986-01-24 1987-08-05 Valeo Electronique Zündspule mit geschlossenem magnetischem Kreis
DE9114575U1 (de) * 1990-12-27 1992-01-16 Industrie Magneti Marelli S.P.A., Mailand/Milano Zündspule für einen Verbrennungsmotor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195811A (ja) * 1983-04-20 1984-11-07 Nippon Denso Co Ltd 内燃機関用同時点火コイル
EP0230811A2 (de) * 1986-01-24 1987-08-05 Valeo Electronique Zündspule mit geschlossenem magnetischem Kreis
DE9114575U1 (de) * 1990-12-27 1992-01-16 Industrie Magneti Marelli S.P.A., Mailand/Milano Zündspule für einen Verbrennungsmotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 56 (E - 302)<1779> 12 March 1985 (1985-03-12) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105144318A (zh) * 2013-04-10 2015-12-09 金刚石电机株式会社 点火线圈
EP2985771A4 (de) * 2013-04-10 2016-12-21 Diamond Electric Mfg Zündspule
US10056185B2 (en) 2013-04-10 2018-08-21 Diamond Electric Mfg. Co., Ltd. Ignition coil realizing a closed magnetic circuit and higher efficiency
CN105144318B (zh) * 2013-04-10 2018-10-23 金刚石电机株式会社 点火线圈
CN109585146A (zh) * 2013-04-10 2019-04-05 金刚石电机株式会社 内燃机用点火线圈
CN109585146B (zh) * 2013-04-10 2021-12-07 金刚石捷歩拉电机株式会社 内燃机用点火线圈

Also Published As

Publication number Publication date
IT1261293B (it) 1996-05-09
ITTO930200A1 (it) 1994-09-24
ITTO930200A0 (it) 1993-03-24

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