EP0034955B1 - Zündspule für Verbrennungsmotoren - Google Patents
Zündspule für Verbrennungsmotoren Download PDFInfo
- 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
Links
Images
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.
Claims (7)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8003653A FR2476218A1 (fr) | 1980-02-20 | 1980-02-20 | Bobine d'allumage pour moteurs a combustion interne |
FR8003653 | 1980-02-20 | ||
FR8009742 | 1980-04-30 | ||
FR8009742A FR2481753A2 (fr) | 1980-04-30 | 1980-04-30 | Bobine d'allumage pour moteurs a combustion interne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0034955A1 EP0034955A1 (de) | 1981-09-02 |
EP0034955B1 true EP0034955B1 (de) | 1984-10-24 |
Family
ID=26221613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81400073A Expired EP0034955B1 (de) | 1980-02-20 | 1981-01-21 | Zündspule für Verbrennungsmotoren |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0034955B1 (de) |
DE (1) | DE3166748D1 (de) |
ES (1) | ES499553A0 (de) |
Families Citing this family (9)
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 (de) | 2007-06-08 | 2016-11-23 | ABB Technology Oy | Schutz permanenter Magneten in einem Gleichstrominduktor |
US8289117B2 (en) * | 2010-06-15 | 2012-10-16 | Federal-Mogul Corporation | Ignition coil with energy storage and transformation |
Citations (5)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2168919B3 (de) * | 1972-01-26 | 1974-03-15 | Ducellier & Cie |
-
1981
- 1981-01-21 DE DE8181400073T patent/DE3166748D1/de not_active Expired
- 1981-01-21 EP EP81400073A patent/EP0034955B1/de not_active Expired
- 1981-02-18 ES ES499553A patent/ES499553A0/es active Granted
Patent Citations (5)
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 |
---|---|
EP0034955A1 (de) | 1981-09-02 |
ES8200744A1 (es) | 1981-12-01 |
DE3166748D1 (en) | 1984-11-29 |
ES499553A0 (es) | 1981-12-01 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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17P | Request for examination filed |
Effective date: 19810925 |
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ITF | It: translation for a ep patent filed |
Owner name: SOCIETA' ITALIANA BREVETTI S.P.A. |
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