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Ignition coil

A technology for ignition coils and coils, which is applied to transformers, electrical components, induction energy storage devices, etc., and can solve problems such as reduced bending strength of ignition coils

Inactive Publication Date: 2010-05-26
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the vibration of the engine, the bending load is further applied to the ignition coil, and thus, the bending strength of the ignition coil is further reduced

Method used

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  • Ignition coil
  • Ignition coil
  • Ignition coil

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0032] refer to Figures 1 to 6 The first embodiment is described.

[0033] Such as figure 1 As shown in , the ignition coil 1 includes a coil portion 2 composed of a primary coil 21 and a secondary coil 22 . One axial end of the coil portion 2 on the D1 side is assembled to the connector housing 3 via a cylindrical fitting member 4 . The connector housing 3 includes a connector portion 32 and a flange portion 33 . A central core 23 made of a magnetic material is disposed radially inside the primary coil 21 and the secondary coil 22 . An outer core 24 made of a magnetic material is disposed radially outside of the primary coil 21 and the secondary coil 22 .

[0034] The connector housing 3 has a fitting hole 31 . The fitting member 4 has an outer edge on the D1 side. This outer edge of the fitting member 4 is fitted into the fitting hole 31 . The fitting member 4 has an inner edge on the D2 side. This inner edge of the fitting member 4 on the D2 side is fitted to the o...

no. 2 example

[0053] refer to Figures 7 to 11 A second embodiment is described.

[0054] Such as Figure 7 As shown, the outer edge of the fitting member 4 is fitted into the fitting hole 31 formed in the connector housing 3 . The outer core 24 is fitted onto the inner edge of the fitting member 4 . According to the embodiment, the elastic member 52 is embedded in the fitting member 4 . The elastic member 52 is formed of a material having a Young's modulus smaller than that of the thermoplastic resin constituting the fitting member 4 .

[0055] The fitting member 4 made of thermoplastic resin is cylindrical, that is, annular in cross section. A fitting portion 43 is formed on the other axial end of the fitting member 4 on the D2 side. The outer edge of the fitting portion 43 is fitted into the fitting hole 31 of the connector housing 3 . The inner edge of the fitting portion 43 is fitted to the outer core 24 . A support portion 44 is formed on the axial end of the fitting member 4 o...

no. 3 example

[0067] refer to Figures 12 to 16 A third embodiment is described.

[0068] refer to Figure 12 , the outer edge of the fitting member 4 on the D1 side is fitted into the fitting hole 31 formed in the connector housing 3 . The inner edge of the other axial end of the fitting member 4 on the D2 side is fitted to the outer core 24 . The fitting member 4 and the connector housing 3 are fitted together in the first fitting area A1. The fitting member 4 and the outer core 24 are fitted together in the second fitting area A2. The assembly areas A1 , A2 are defined offset with respect to the axial direction D of the ignition coil 1 . In this structure, the assembly areas A1, A2 are far away from each other with respect to the axial direction D, and thus do not overlap each other in the axial direction D.

[0069] The fitting member 4 made of thermoplastic resin is formed in a cylindrical shape. A housing fitting portion 41 is formed on the axial end of the fitting member 4 on t...

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PUM

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Abstract

An ignition coil includes a coil portion that has a primary coil, a secondary coil, and an outer core. The outer core is arranged on a radially outer side of both the primary coil and the secondary coil. A fitting member, which is in a substantially cylindrical shape, has an inner periphery via which the fitting member is fitted to the outer core. A connector case has a fit hole via which the connector case is fitted to an outer periphery of the fitting member. The connector case connects with an axial end of the coil portion via the fitting member. The fitting member includes an embedded member that is at least partially embedded in the fitting member. The embedded member is formed of a material that is different in Young's modulus from a material constructing the fitting member.

Description

technical field [0001] The present invention relates to ignition coils. Background technique [0002] An ignition coil of an internal combustion engine includes a primary coil formed by winding an electric wire around a primary coil spool and a secondary coil formed by winding an electric wire around a secondary coil spool. The primary coil is positioned coaxially with respect to the secondary coil. [0003] A central core made of magnetic material is placed radially inside the primary and secondary coils. An outer core made of a magnetic material is placed radially outside the primary and secondary coils. In this structure, the magnetic path is defined by the central core and the outer core. A thermosetting resin such as epoxy resin is filled into the gap formed in the ignition coil. [0004] Rod ignition coils include primary coils, secondary coils, center cores, outer cores, etc. The coil portion of the rod type ignition coil is placed in the spark plug hole of the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/12F02P3/02
Inventor 中本清稔佐藤美孝
Owner DENSO CORP