EP1625601A2 - Procede de fabrication d'une bobine d'allumage individuel et bobine ainsi obtenue - Google Patents
Procede de fabrication d'une bobine d'allumage individuel et bobine ainsi obtenueInfo
- Publication number
- EP1625601A2 EP1625601A2 EP04742782A EP04742782A EP1625601A2 EP 1625601 A2 EP1625601 A2 EP 1625601A2 EP 04742782 A EP04742782 A EP 04742782A EP 04742782 A EP04742782 A EP 04742782A EP 1625601 A2 EP1625601 A2 EP 1625601A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- tubular body
- winding
- primary
- secondary 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 51
- 239000003989 dielectric material Substances 0.000 claims abstract description 16
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- 238000005470 impregnation Methods 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 5
- 229920001187 thermosetting polymer Polymers 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000000470 constituent Substances 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/122—Insulating between turns or between winding layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
Definitions
- the present invention relates to the technical field of internal combustion thermal engines and more particularly to spark ignition engines.
- the invention relates more particularly to ignition systems in which each spark plug is equipped with a unitary coil for transforming electrical energy capable of supplying it, from a low voltage electrical energy source, an energy high voltage necessary for the production of an ignition spark between the electrodes of such a spark plug inside the combustion chamber of the cylinder.
- an ignition coil comprises a tubular body or secondary coil carcass, made of a dielectric material and internally comprising a central magnetic core and on its external face a secondary winding.
- One of the terminals of the secondary winding is connected to means of electrical cooperation with the connection terminal of the spark plug.
- This secondary coil-tubular body assembly is inserted into a primary tubular carcass on the external face of which is wound a primary winding connected to a low voltage connector.
- the primary winding is surrounded by a magnetic cylinder ensuring the closure of the flow with the magnetic core.
- this coil thus formed or a part of the constituent parts is impregnated with a dielectric resin during a vacuum casting operation.
- Such an ignition coil is intended to be inserted into a well arranged in the cylinder head and at the bottom of which is housed a spark plug.
- Such coils are subjected to high temperatures and vibrations and must have an optimized insulation in a volume of limited diametrical size.
- this type of coil has a relatively large number of constituent parts, the assembly of which must be carried out in a precise and careful manner to guarantee the reliability of the coil. In the same direction, the assembly of these different parts requires fitting areas which create interfaces capable of breaking the dielectric insulation favoring the flow of high voltage.
- the impregnation made under vacuum requires large passage sections to allow the relatively viscous resin to flow by gravity between the various component parts before atmospheric pressure is restored around the coil and that it compacts the resin towards areas that are still empty.
- the polymerization of the resins used for this type of application requires gelation and polymerization ovens in which the coils must remain for several hours.
- the nesting of the various constituent parts and of the resin poses problems of mechanical stresses, in particular during thermal cycles, due to the differences in expansion coefficient of the materials present.
- patent EP 0 843 394 proposes to produce an ignition coil not comprising a primary tubular carcass. Indeed, a dielectric resin which coats the secondary coil is used, after hardening, for the winding of the primary winding.
- a primary tubular carcass makes the winding operation of the primary winding difficult.
- such an ignition coil does not provide a solution to the problem associated with the presence of interfaces capable of breaking the dielectric insulation favoring the high voltage path.
- the drawbacks mentioned above relating to the use of resins remain intact for such an ignition coil.
- the present invention therefore aims to remedy the drawbacks set out above by proposing a new technique for producing an integrated individual ignition coil, designed to facilitate manufacturing operations while ensuring safe and effective dielectric isolation. between the various constituent parts.
- Another object of the invention is to propose a method making it possible to obtain a new integrated individual ignition coil designed to present an optimized insulation in a reduced diametral size.
- the method comprises the following steps: - winding of a secondary winding on a tubular body of secondary coil,
- the method is characterized in that it comprises a step of overmolding the tubular body assembly (11) secondary winding (15) by a dielectric material ensuring an impregnation of the secondary winding and the formation of on the one hand a tubular body of primary coil (21) adapted to allow during a subsequent step, the winding of the primary winding (23), and on the other hand, a connection end piece (21 ⁇ ) to a spark plug extending the tubular body of primary coil (21) at one of its ends.
- the method consists during the overmolding step, in ensuring the formation of a tubular body of primary coil, provided at the opposite end of that equipped with the end piece, with means suitable for receive low voltage electrical connections.
- the method according to the invention consists, during the overmolding step, in sealing the bore of the tubular body of secondary coil.
- the method according to the invention also includes a step of mounting a magnetic core inside the bore of the tubular body of secondary coil.
- the method according to the invention also includes a step of mounting a cylinder for looping the magnetic flux with the magnetic core, mounted outside the primary winding.
- the method consists in ensuring the step of overmolding, by the injection under pressure inside a mold, of a thermosetting dielectric material.
- Another object of the invention is to provide a coil comprising at least one tubular body of secondary coil carrying on its external face, a secondary winding and a tubular body of a dielectric material overmolded on the secondary winding also ensuring the impregnation of the secondary winding, the overmolded tubular body being extended at one end by a nozzle suitable for connection to a spark plug.
- the overmolded tubular body comprises, at its opposite end from that provided with the end piece, means adapted to receive low voltage electrical connections.
- the integrated ignition coil according to the invention comprises a molded tubular body carrying on its external surface a primary winding outside of which is mounted a cylinder for looping the magnetic flux with a magnetic core inserted inside the body tubular.
- Figure 1 is a longitudinal sectional view of an embodiment of an integrated ignition coil according to the invention.
- FIGS 2, 3 and 4 are views in longitudinal section showing different characteristic steps of the manufacturing process of an ignition coil according to the invention.
- the ignition coil 1 is intended to provide the individual electrical supply of a spark plug 2 of a heat engine represented simply schematically and located at the bottom of a well 3 of a cylinder head 4 of such an engine.
- the coil designated as a whole by the reference 1, is intended to be mounted to be interposed between the spark plug 2 and an ignition system known to those skilled in the art, capable of controlling the coil in order to generate a current high voltage by spark plug 2.
- FIG. 2 illustrate different characteristic steps of the manufacturing process of an ignition coil 1 according to the invention.
- the coil 1 comprises a carcass or a tubular body of secondary coil 11 made of a dielectric material, for example in a thermoplastic or thermosetting material.
- this secondary carcass 11 is produced by molding, by the injection of a thermoplastic or thermosetting material.
- This tubular carcass 11 has a central bore 12 of longitudinal axis x intended to receive a magnetic core 13 constituted for example by a laminated mass oriented along the longitudinal axis x.
- the secondary carcass 11 is delimited by an external face of revolution 14 intended to receive a secondary winding 15 having a low voltage end 16 located in relation to an end portion 17 of the secondary carcass 11 and a high voltage end 18 located at a portion terminal 19 of the secondary carcass 11, located opposite the other terminal part 17.
- the method consists in then implementing a step of overmolding the secondary carcass 11 - secondary winding 15 assembly, with a dielectric material ensuring an impregnation of the secondary winding 15 and the formation of a carcass or a tubular body of primary coil 21 adapted to allow, during a subsequent step, the winding of a primary winding 23.
- the method according to the invention thus consists in ensuring injection under pressure in an overmolding mold, of a dielectric material, preferably thermosetting.
- a dielectric material provides impregnation of the turns of the secondary winding 15 as well as a high-voltage insulation function for the secondary coil.
- this dielectric material is carried out so as to obtain a primary carcass 21 serving as a support for the primary coil.
- This primary carcass 21 thus extends concentrically with the secondary carcass 11 and outside the secondary winding 15 along at least the entire length of the secondary winding taken along the axis x.
- this overmolding step is taken advantage of so that the primary carcass 21 has conformations to assume additional functions such as mechanical assembly and / or electrical connection. - - . ..
- the method consists in ensuring during this overmolding step, the formation of a primary carcass 21 extending at one end, by a nozzle 21 1 for connection to a spark plug coming from fit inside the end piece 21 ⁇ .
- the end piece 21 ⁇ incorporates electrical connection means in order to constitute a stud high voltage 25 of the ignition coil.
- the high voltage pad 25 is formed by a high voltage tab on which is mounted a spring.
- an extension 21 2 can thus constitute a low voltage connector.
- the bore 12 of the secondary carcass 11 is closed so as to subsequently allow the mounting of the magnetic core.
- the method according to the invention then aims to implement a step of mounting a cylinder 26 for looping the magnetic flux with the magnetic core 13, mounted outside the primary winding 23.
- the manufacturing method according to the invention reduces the number of components of an ignition coil thus facilitating assembly operations. This reduction in the number of parts makes it possible to eliminate the interfaces and consequently the breakdown faults between the high voltage pad 25 and the loop cylinder 26, and between the high voltage pad 25 and the primary winding 23.
- this magnetic core 13 can expand freely as a function of the temperature without causing cracking of the secondary carcass 11.
- the invention is not limited to the examples described and shown since various modifications can be made without departing from its scope.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Disintegrating Or Milling (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0306132A FR2855317B1 (fr) | 2003-05-22 | 2003-05-22 | Procede de fabrication d'une bobine d'allumage individuel et bobine ainsi obtenue |
| PCT/FR2004/001239 WO2004107372A2 (fr) | 2003-05-22 | 2004-05-19 | Procede de fabrication d'une bobine d'allumage individuel et bobine ainsi obtenue |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1625601A2 true EP1625601A2 (fr) | 2006-02-15 |
| EP1625601B1 EP1625601B1 (fr) | 2010-12-29 |
Family
ID=33396653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04742782A Revoked EP1625601B1 (fr) | 2003-05-22 | 2004-05-19 | Procede de fabrication d'une bobine d'allumage individuel et bobine ainsi obtenue |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20070006858A1 (fr) |
| EP (1) | EP1625601B1 (fr) |
| CN (1) | CN1795519A (fr) |
| AT (1) | ATE493743T1 (fr) |
| DE (1) | DE602004030782D1 (fr) |
| FR (1) | FR2855317B1 (fr) |
| WO (1) | WO2004107372A2 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008053677A (ja) * | 2006-07-26 | 2008-03-06 | Denso Corp | 点火コイル |
| FR2905527B1 (fr) * | 2006-09-05 | 2014-10-10 | Valeo Sys Controle Moteur Sas | Bloc de connexion basse tension d'un dispositif d'allumage, procede d'assemblage d'un tel dispositif et dispositif d'allumage assemble selon le procede. |
| CN102522194B (zh) * | 2011-12-12 | 2013-09-11 | 陕西宝成航空仪表有限责任公司 | 变压器式传感器线圈的阶梯绕制方法 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4831995A (en) * | 1987-04-08 | 1989-05-23 | Societe A Responsabilite Limitee: L'electricfil Industrie | Integrated ignition-transformer assembly for the cylinder of a controlled ignition heat engine |
| JPH08213258A (ja) * | 1994-12-06 | 1996-08-20 | Nippondenso Co Ltd | 内燃機関用点火コイル |
| US5870012A (en) * | 1995-12-27 | 1999-02-09 | Toyo Denso Kabushiki Kaisha | Engine ignition coil device |
| JPH10199737A (ja) * | 1996-11-18 | 1998-07-31 | Matsushita Electric Ind Co Ltd | 内燃機関の点火コイル装置 |
| FR2762442B1 (fr) * | 1997-04-17 | 1999-07-09 | Electricfil | Bobine d'allumage pour l'alimentation d'une bougie de moteur thermique |
| JP3727764B2 (ja) * | 1997-09-30 | 2005-12-14 | 株式会社日立製作所 | エンジン用点火コイル装置及びその製造方法 |
| DE19805628C2 (de) * | 1998-02-12 | 2001-09-20 | Beru Ag | Zündspulen und ihre Herstellung |
| US6216679B1 (en) * | 1999-07-27 | 2001-04-17 | Delphi Technologies, Inc. | Ignition coil for an internal combustion engine |
| US6809621B2 (en) * | 2001-05-31 | 2004-10-26 | Denso Corporation | Internal combustion engine ignition coil, and method of producing the same |
-
2003
- 2003-05-22 FR FR0306132A patent/FR2855317B1/fr not_active Expired - Fee Related
-
2004
- 2004-05-19 WO PCT/FR2004/001239 patent/WO2004107372A2/fr not_active Ceased
- 2004-05-19 CN CN200480014032.1A patent/CN1795519A/zh active Pending
- 2004-05-19 US US10/557,546 patent/US20070006858A1/en not_active Abandoned
- 2004-05-19 DE DE602004030782T patent/DE602004030782D1/de not_active Expired - Lifetime
- 2004-05-19 AT AT04742782T patent/ATE493743T1/de not_active IP Right Cessation
- 2004-05-19 EP EP04742782A patent/EP1625601B1/fr not_active Revoked
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004107372A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE602004030782D1 (de) | 2011-02-10 |
| FR2855317A1 (fr) | 2004-11-26 |
| ATE493743T1 (de) | 2011-01-15 |
| WO2004107372A2 (fr) | 2004-12-09 |
| FR2855317B1 (fr) | 2008-09-26 |
| US20070006858A1 (en) | 2007-01-11 |
| EP1625601B1 (fr) | 2010-12-29 |
| WO2004107372A3 (fr) | 2005-07-14 |
| CN1795519A (zh) | 2006-06-28 |
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