CN105513778B - Internal combustion engine ignition coil - Google Patents

Internal combustion engine ignition coil Download PDF

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Publication number
CN105513778B
CN105513778B CN201510649044.1A CN201510649044A CN105513778B CN 105513778 B CN105513778 B CN 105513778B CN 201510649044 A CN201510649044 A CN 201510649044A CN 105513778 B CN105513778 B CN 105513778B
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China
Prior art keywords
iron core
mentioned
igniter
periphery
molded item
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Expired - Fee Related
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CN201510649044.1A
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Chinese (zh)
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CN105513778A (en
Inventor
秋本克德
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Denso Corp
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Denso Corp
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Abstract

Internal combustion engine ignition coil has: primary coil, secondary coil, central core, periphery iron core, iron core molded item, igniter, shell and potting resin.Iron core molded item is made of resin, and the outline border of periphery iron core is formed around covering periphery iron core.The igniter pocket for configuring igniter is formed in the lateral surface of iron core molded item.The incised notch portion that a part for the lateral surface for making periphery iron core is exposed is formed at the position opposite with igniter pocket of the lateral surface of iron core molded item.Igniter configures in igniter pocket via incised notch portion and a part of opposed of the lateral surface of periphery iron core.

Description

Internal combustion engine ignition coil
Technical field
The present invention relates to the ignition coils for making spark plug generate igniting spark in internal combustion engine.
Background technique
Ignition coil is configured to, the assembly as made of the assembling of primary coil, secondary coil, central core and periphery iron core Configuration is in shell.In addition, the intracorporal gap of the shell of ignition coil is filled by potting resin and is formed.In addition, matching in shell It is equipped with igniter, which is provided with the switching circuit for carrying out energization and power-off to primary coil.The big multi-configuration of igniter Coil part side and for will be near the connector portion of ignition coil and external electrical connections.
For example, describing following ignition coil in patent document 1: primary coil, secondary coil, central core, outer In shell, the intracorporal gap of shell is filled by insulation fixing resin for Zhou Tiexin and igniter configuration.In addition, also describing at this In ignition coil, makes a side for being provided with heat sink for igniter and be relatively configured outside the iron core of periphery.
Patent document 1: No. 4978497 bulletins of Japanese Patent No.
But in the previous ignition coil of patent document 1 etc., igniter is configured at the intracorporal space of shell.Therefore, do not have There is the positioning appropriate of igniter, needs to carry out the positioning of igniter using fixture etc. in ignition coil assembling.
Further, since heating and the cooling cycle of engine and each constituent part in ignition coil is expanded and is shunk repeatedly When, it may be easy the position concentrated using the corner iso-stress of such as igniter as starting point, tortoise occurs in insulation fixing resin It splits.In some cases, the cracking not only insulation fixing resin in, it is also possible to develop to shell.It is accommodated in and sets in igniter In the case where the incorporating section for being placed in shell, the development of the cracking may similarly occur.
In addition, also being needed sometimes in the case where being electrically connected the terminal of igniter by welding etc. for carrying out igniter Positioning fixture etc..
Summary of the invention
Present invention has been made in view of the above circumstances, it is intended that providing a kind of group that can be improved ignition coil The internal combustion engine ignition coil of the thermal diffusivity of dress property and durability and igniter.
One embodiment of the present invention, internal combustion engine ignition coil have: being configured to the primary coil of same heart shaped in interior periphery And secondary coil;Central core configures the inner circumferential in above-mentioned primary coil and above-mentioned secondary coil;Cricoid periphery iron core, ring Around above-mentioned primary coil and above-mentioned secondary coil;The iron core molded item of resin covers around the periphery iron core, it is outer to form this The outline border of Zhou Tiexin;Igniter forms the switching circuit for carrying out energization and power-off to above-mentioned primary coil;Shell, in receiving State primary coil, above-mentioned secondary coil, above-mentioned central core, above-mentioned periphery iron core, above-mentioned iron core molded item and above-mentioned igniter; And potting resin, fill the intracorporal gap of the shell.In addition, one embodiment of the present invention, in the outside of above-mentioned iron core molded item Face is formed with the igniter pocket for configuring above-mentioned igniter.Above-mentioned iron core molded item lateral surface with above-mentioned igniter pocket Opposite position is formed with the incised notch portion that a part for the lateral surface for making above-mentioned periphery iron core is exposed.
Above-mentioned igniter is opposed to configuration across one of above-mentioned incised notch portion and the above-mentioned lateral surface of above-mentioned periphery iron core and exists In above-mentioned igniter pocket.
The effect of invention:
In above-mentioned internal combustion engine ignition coil, it is used to mitigate the iron core of the stress of potting resin in covering periphery iron core Molded item forms the igniter pocket for configuring igniter.Also, the igniter of igniter pocket is configured at via being formed in iron core The incised notch portion of the lateral surface of molded item and it is a part of opposed with the lateral surface of periphery iron core.Thereby, it is possible to be easy to carry out a little Positioning of the firearm relative to primary coil, secondary coil, central core and periphery iron core.Also, by the terminal of igniter and its When his terminal electrical connection, the positioning of igniter can easily be done.
In addition, by by igniter configuration in the integrated iron core molded item of periphery iron core, can by igniter with Primary coil, secondary coil, central core, periphery iron core and iron core molded item integrally assemble.Also, pass through the assembly Configuration can easily be done the assembling and electrical connection of igniter in shell.
Igniter is a part of opposed with the lateral surface of periphery iron core via the incised notch portion for being formed in iron core molded item.By This, can will dissipate from the heat that the igniter as heating part generates to the excellent periphery iron core of heat conductivity.In addition, thus It can be improved the thermal diffusivity of igniter.
In turn, by the way that the configuration of iron core molded item between igniter and potting resin, can be mitigated answering for potting resin Power, so that potting resin is not likely to produce cracking.Alternatively, the cracking generated in potting resin is enabled to be not easy in potting resin Middle development.
In the case that entirety around igniter is filled resin encirclement, cracking is easy development in potting resin.With This is opposite, by the way that by igniter configuration, in igniter pocket, iron core molded item is configured in around igniter.As a result, due to Iron core molded item and act on potting resin stress reduce so that the cracking generated in potting resin is not easy to develop to shell Body.
Therefore, according to above-mentioned internal combustion engine ignition coil, the assemblability and durability, Yi Jidian of ignition coil be can be improved The thermal diffusivity of firearm.
Detailed description of the invention
Fig. 1 is the cross section explanatory diagram indicated inside the ignition coil of embodiment.
Fig. 2 is the perspective view for indicating the iron core molded item of covering periphery iron core of embodiment.
Fig. 3 is the perspective view for indicating the state by ignition coil assembling of embodiment.
Fig. 4 is the explanatory diagram for indicating another iron core molded item of covering periphery iron core of embodiment.
Fig. 5 is the cross section explanatory diagram for indicating another iron core molded item of covering periphery iron core of embodiment.
Fig. 6 is the perspective view for indicating the iron core molded item of covering periphery iron core of embodiment.
Specific embodiment
Illustrate the embodiment of internal combustion engine ignition coil referring to the drawings.
(embodiment)
As shown in Figure 1, the internal combustion engine ignition coil 1 (hereinafter referred to as ignition coil 1) of this example has: primary coil 21, secondary coil 22, central core 5, periphery iron core 6, iron core molded item (core mold) 7, igniter 4, shell 11 and filling Resin 13.Primary coil 21 and secondary coil 22 are located at interior periphery and are configured to same heart shaped.Central core 5 is configured primary The inner circumferential of coil 21 and secondary coil 22.Periphery iron core 6 is formed around the ring-type of primary coil 21 and secondary coil 22.Iron core Molded item 7 is made of the elastomer of thermoplasticity or Thermocurable.In addition, iron core molded item 7 cover periphery iron core 6 around and The outline border of periphery iron core 6 is formed, and mitigates the stress from potting resin 13.
Igniter 4 is formed by molded item (mold) resin 42 of circuit portion 41 and covering circuit portion 41,41 shape of circuit portion At the switching circuit for carrying out energization and power-off to primary coil 21.Shell 11 is made of thermoplastic resin.In addition, shell 11 Accommodate primary coil 21, secondary coil 22, central core 5, periphery iron core 6, iron core molded item 7 and igniter 4.Potting resin 13 It is made of heat-curing resin.In addition, potting resin 13 fills the gap in shell 11, each constituent part is insulated and fixed.
As shown in Fig. 2, the lateral surface 701 in iron core molded item 7 is formed with the igniter pocket 72 for configuring igniter 4. At the position opposite with igniter pocket 72 of the lateral surface 701 of iron core molded item 7, it is formed with the lateral surface 61 for making periphery iron core 6 A part expose incised notch portion 73A.As shown in Figure 1, Figure 3, igniter 4 via incised notch portion 73A and periphery iron core 6 lateral surface 61 a part of opposed and configure in igniter pocket 72.
Hereinafter, referring to Fig.1~Fig. 6 illustrates the ignition coil 1 of this example.
As shown in Figure 1, the configuration of ignition coil 1 is in each cylinder of engine.In addition, ignition coil 1 is for making to be configured at The spark plug of the consent of each cylinder generates spark.Primary coil 21, secondary coil 22, center iron in the ignition coil 1 of this example Core 5, periphery iron core 6, iron core molded item 7, igniter 4, shell 11 etc. are configured in the outside of consent.In addition, in ignition coil 1 It is provided with linking part 12, the linking part 12 configuration is connect in consent and with spark plug.
As shown in Figure 1, Figure 3, multiple electromagnetic steel plates with soft magnetism are laminated and shape for central core 5 and periphery iron core 6 At.Primary coil 21 is wound on the periphery of a spool 31 in the section for four square tube shapes being rounded down.Secondary coil volume 22 It is wound on the periphery of the secondary spool 32 in the section for four square tube shapes being rounded down.Periphery iron core 6 and iron core molded item 7 are formed as The cubic ring-shaped of outer corners rounded corner.Multiple electromagnetic steel plates of central core 5 and periphery iron core 6 are constituted in periphery iron core 6 Perforation direction L on be laminated.
As shown in Figure 1, an end face of central core 5 is across the permanent magnet 51 and periphery iron core for generating flux in reverse bias 6 medial surface 62 is opposed.In addition, the other end of central core 5 is opposed with the medial surface 62 of periphery iron core 6.Iron core molded item 7 By the elastomer of 6 mould-forming of periphery iron core is formed.When by elastomer by periphery 6 mould-forming of iron core, igniter pocket 72 are integrally formed with iron core molded item 7.
As shown in Figure 1, a spool 31 has the canister portion 311 of winding primary coil 21 and is connected with the end of canister portion 311 Connector portion 312.The multiple terminals 313 engaged with multiple terminals 43 in igniter 4 are provided in connector portion 312.Two Secondary spool 32 has the canister portion 321 of winding secondary coil 22.It is configured in the periphery of central core 5 and winds the one of primary coil 21 Secondary spool 31.In addition, configuring the secondary spool 32 for winding secondary coil 22 in the periphery of a spool 31.In turn, a secondary volume A part of the connector portion 312 of axis 31 is chimeric with the chimeric incised notch portion 113 for being formed in shell 11, constitutes one of shell 11 Point.
As shown in Fig. 2, a part of the lateral surface 701 in iron core molded item 7, makes the one of the lateral surface 61 of periphery iron core 6 Part is exposed, and is formed for configuring igniter 4 and the incised notch portion 73A opposed with lateral surface 61.In addition, in iron core molded item 7 A part of medial surface 702 is formed with a part and permanent magnet 51 or center iron for making the medial surface 62 of periphery iron core 6 The opposed incised notch portion 73B in the other end of core 5.
In addition, igniter pocket 72, on the lateral surface 701 of iron core molded item 7, the unilateral side on perforation direction L, which has, to be used for It is inserted into the opening portion 721 of igniter 4.In addition, the opening portion 721 of the igniter pocket 72 can also be in the two sides shape of perforation direction L At with breakthrough status formation igniter pocket 72.
As shown in Fig. 2, the open end 74 in the upside of iron core molded item 7, is formed with and adds the thickness of iron core molded item 7 Big protrusion 741.The protrusion 741 of this example is formed in opening for the upside in addition to the low pressure side of iron core molded item 7 point other than Mouth end face 74.The protrusion 741 also has other than having the effect of inhibiting the cracking generation of potting resin 13 and reduces shell The effect of the loading of the 11 interior potting resins 13 filled and the stress for reducing potting resin 13.In addition, protrusion 741 The open end 75 of the downside of iron core molded item 7 can be formed in.
As shown in figure 3, the formation of perforation direction L towards the shell 11 of periphery iron core 6 and iron core molded item 7 has opening portion 111 opening direction.Shell 11 has the incorporating section 112 of square shape, to store the iron core molded item with cubic ring-shaped 7.The opposite side that shell 11 is formed with the side of linking part 12 in ignition coil 1 has opening portion 111.Configuration in shell 11 The protruding parts 114 of the igniter pocket 72 of cored molded item 7 are more protruded outward than being located at the position of its left and right.Also, point Firearm pocket 72 is inserted into protruding parts 114 and is positioned.
As shown in figure 3, in the periphery of central core 5, configuration has wound primary coil 21 when carrying out the assembling of ignition coil 1 A spool 31.In addition, having wound the secondary spool 32 of secondary coil 22 in the configuration of the periphery of a spool 31, assembling is formed Tooth preparation 15.Then, which is configured into the inner circumferential in the periphery iron core 6 covered by iron core molded item 7, formation group Fill body.In addition, before and after it will assemble Tooth preparation 15 and be configured to periphery iron core 6, in the igniter pocket 72 in iron core molded item 7 Igniter 4 is configured, keeps igniter 4 opposed with the lateral surface 61 of periphery iron core 6.Then, by assembly configuration in shell 11.This When, assembly is inserted into the incorporating section 112 of shell 11 from the opening portion of shell 11 111 along the perforation direction L of periphery iron core 6. Then, the gap into shell 11 injects the potting resin 13 being made of heat-curing resin and makes its solidification, forms ignition lead Enclose main part.Then, linking part 12 is installed to ignition coil main part, forms ignition coil 1.
As shown in Fig. 2, igniter pocket 72 is formed in the outside of the low-pressure side positioned at secondary coil 22 in iron core molded item 7 Face 701.The center in outer side 701 can be set in igniter pocket 72.In addition, igniter pocket 72 also can be set on the outside The position deviated to the left and right in face 701.
In addition, as shown in figure 4, the corner 722 of igniter pocket 72 and the boundary of igniter pocket 72 and iron core molded item 7 Portion 723 can also be formed as curved.In this case, igniter pocket 72 is from the portion outstanding of lateral surface 701 of iron core molded item 7 The entirety divided is smoothly formed, to avoid the starting point that cracking occurs is formed.Thereby, it is possible to effectively inhibit in potting resin 13 Cracking occurs.
In addition, as shown in Figure 1, the inside of the molded item resin 42 in igniter 4, can also be arranged in circuit portion 42 and radiate Plate 44.Heat sink 44 can expose on the surface of igniter 4, opposed with the lateral surface 61 of periphery iron core 6.Thereby, it is possible into one Step improves the thermal diffusivity of igniter 4.
In addition, be embedded in as shown in figure 5, can also be formed in a part of the lateral surface 61 of periphery iron core 6 for igniter 4 Iron core incised notch portion 63.In this case, a part configuration of igniter 4 can reduce in the iron core incised notch portion 63 of periphery iron core 6 The whole shared space in ignition coil 1 of iron core molded item 7 including igniter 4 and periphery iron core 6, can be realized The miniaturization of ignition coil 1.
In addition, as shown in fig. 6, can also iron core molded item 7 lateral surface 701 and downside open end 75 at least The one rectangular protrusion 76 at for being located in iron core molded item 7 in the incorporating section 112 of shell 11.In this case, can It is easy to carry out insertion and positioning of the iron core molded item 7 to the incorporating section of shell 11 112.
In addition it is also possible to be formed in the incised notch portion 73B for configuration center iron core 5 of the medial surface 702 of iron core molded item 7 For carrying out the protrusion 77 of the positioning of central core 5.
In the ignition coil 1 of this example, formed in the iron core molded item 7 of covering periphery iron core 6 for configuring igniter 4 Igniter pocket 72.Also, it is configured at the cutting across the lateral surface 701 for being formed in iron core molded item 7 of igniter 4 of igniter pocket 72 Scarce portion 73A is a part of opposed with the lateral surface 61 of periphery iron core 6.Thereby, it is possible to be easy to carry out igniter 4 relative to primary The positioning of coil 21, secondary coil 22, central core 5 and periphery iron core 6.Also, by the terminal of igniter 4 43 and connector portion When 312 terminal 313 is electrically connected, the positioning of igniter 4 can easily be done.
In addition, by by igniter 4 configuration with the integrated iron core molded item 7 of periphery iron core 6, can be by igniter 4 It is integrally assembled with primary coil 21, secondary coil 22, central core 5, periphery iron core 6 and iron core molded item 7 and forms assembling Body.Also, by the way that assembly configuration in shell 11, can easily be done the assembling and electrical connection of igniter 4.
In addition, igniter 4 across the incised notch portion 73A and periphery iron core 6 for being formed in iron core molded item 7 lateral surface 61 one Part is opposed.The periphery iron core 6 that thereby, it is possible to keep the heat generated from the igniter 4 as heating part excellent to heat conductivity Dissipation, can be improved the thermal diffusivity of igniter 4.
In addition, potting resin 13 can be mitigated by configuring iron core molded item 7 between igniter 4 and potting resin 13 Stress so that potting resin 13 is not likely to produce cracking, or the cracking generated in potting resin 13 is made to be not easy to set in filling Develop in rouge 13.
In addition, cracking is held in potting resin 13 in the case that the entirety around igniter 4 is surrounded by potting resin 13 Easily development.In contrast, in the ignition coil of this example 1, by the way that by the configuration of igniter 4, in igniter pocket 72, iron core is molded Part 7 configures around igniter 4.The stress for being acted on potting resin 13 due to iron core molded item 7 as a result, is reduced, filling The cracking generated in resin 13 is not easy to develop to shell 11.
Therefore, according to the ignition coil of this example 1, the assemblability and durability and igniter of ignition coil 1 be can be improved 4 thermal diffusivity.

Claims (5)

1. a kind of internal combustion engine ignition coil, which is characterized in that have:
The primary coil and secondary coil of same heart shaped are configured in interior periphery;
Central core configures the inner circumferential in above-mentioned primary coil and above-mentioned secondary coil;
Cricoid periphery iron core, around above-mentioned primary coil and above-mentioned secondary coil;
The iron core molded item of resin covers around the periphery iron core, forms the outline border of the periphery iron core;
Igniter forms the switching circuit for carrying out energization and power-off to above-mentioned primary coil;
Shell accommodates above-mentioned primary coil, above-mentioned secondary coil, above-mentioned central core, above-mentioned periphery iron core, above-mentioned iron core molding Part and above-mentioned igniter;And
Potting resin fills the intracorporal gap of the shell,
It is formed with the igniter pocket for configuring above-mentioned igniter in the lateral surface of above-mentioned iron core molded item,
At the position opposite with above-mentioned igniter pocket of the lateral surface of above-mentioned iron core molded item, being formed with makes above-mentioned periphery iron core The incised notch portion that a part of lateral surface is exposed,
Above-mentioned igniter is configured across above-mentioned incised notch portion and a part of opposed of the above-mentioned lateral surface of above-mentioned periphery iron core upper It states in igniter pocket.
2. internal combustion engine ignition coil as described in claim 1, which is characterized in that
Above-mentioned periphery iron core and above-mentioned iron core molded item are formed as cubic ring-shaped, and the periphery iron core and the iron core molded item pass through Logical direction has the opening direction of opening portion towards the formation of above-mentioned shell,
At least unilateral side of the above-mentioned igniter pocket on the above-mentioned lateral surface of above-mentioned iron core molded item in above-mentioned perforation direction, which has, opens Oral area.
3. internal combustion engine ignition coil as claimed in claim 1 or 2, which is characterized in that
The boundary portion of the corner of above-mentioned igniter pocket and the igniter pocket and above-mentioned iron core molded item is formed as curved.
4. internal combustion engine ignition coil as claimed in claim 3, which is characterized in that
The iron core incised notch portion for the insertion of above-mentioned igniter is formed in a part of the above-mentioned lateral surface of above-mentioned periphery iron core.
5. internal combustion engine ignition coil as claimed in claim 1 or 2, which is characterized in that
The iron core incised notch portion for the insertion of above-mentioned igniter is formed in a part of the above-mentioned lateral surface of above-mentioned periphery iron core.
CN201510649044.1A 2014-10-10 2015-10-09 Internal combustion engine ignition coil Expired - Fee Related CN105513778B (en)

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JP2014209314A JP6409484B2 (en) 2014-10-10 2014-10-10 Ignition coil for internal combustion engine
JP2014-209314 2014-10-10

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CN105513778B true CN105513778B (en) 2018-12-14

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JP6424689B2 (en) * 2015-03-16 2018-11-21 株式会社デンソー Ignition coil for internal combustion engine
CN108630417B (en) * 2017-03-24 2022-03-01 金刚石捷歩拉电机株式会社 Ignition coil for internal combustion engine
JP7101804B2 (en) * 2018-10-25 2022-07-15 三菱電機株式会社 Ignition coil
JP7484600B2 (en) 2020-09-10 2024-05-16 株式会社デンソー Ignition coil for internal combustion engine

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CN105513778A (en) 2016-04-20
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Granted publication date: 20181214