JP3430652B2 - Ignition device for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine such as an ignition coil in a vehicle engine.

[0002]

2. Description of the Related Art An ignition device for an internal combustion engine is a device for igniting an air-fuel mixture in a cylinder of an internal combustion engine. The device is generally an ignition coil, a distributor, a high tension cord, a spark plug and these. It consists of a voltage and current control unit applied to the. In particular, since the ignition coil is a component that generates a high voltage for discharging with a spark plug, it is required to have excellent electric insulation.

Conventionally, the coil case in the above ignition coil is made of the following resin for the purpose of preventing metal inserts such as cores, cracks caused by press fitting, and cracks caused by thermal stress due to a difference in linear expansion with other parts. It is proposed to make. That is, this resin is a material in which a rubber block copolymer or the like is mixed with a polyester resin to improve impact resistance (Japanese Patent Publication No. 58-47419).
issue).

[0004]

In recent years, it has been required to impart flame retardancy to the material of the ignition coil case for the purpose of preventing fire and the like. However, when a flame retardant is added to the above-mentioned material to make it a flame-retardant material, the impact strength, elongation at break, etc. are lower than before the addition, resulting in a material with poor mechanical properties.

Therefore, when the ignition coil case is made of the flame-retardant material, the thickness of the case is increased in order to supplement the mechanical characteristics and shock resistance, and inserts such as cores and press-fitting are eliminated as much as possible. It is forced to change the structure such as doing. As a result, the ignition coil itself becomes large, and the degree of freedom of the shape decreases, which causes problems.

Incidentally, the coil case described above is disclosed in Japanese Patent Laid-Open No. 3-2.
It is also possible to use a polyester-based material having excellent impact resistance shown in No. 50044. However, it cannot be said that the above materials also have sufficient performance in terms of flame retardancy, apart from impact resistance.

In view of the above problems, the present invention is to provide an ignition device for an internal combustion engine, which is made of a synthetic resin component having excellent mechanical properties and flame retardancy.

[0008]

The present invention relates to a synthetic resin part used in an ignition device for an internal combustion engine, wherein the synthetic resin part is (A).
100 parts by weight of an aromatic polyester resin (weight part, the same applies hereinafter), and 3 to 150 parts of a block copolymer (B) derived from an aromatic alkenyl compound and a diene monomer.
(C) Epoxy group- or oxazolinyl group-containing olefin polymer 3 to 120 parts, and (D) flame retardant 8 to 130
An ignition device for an internal combustion engine, characterized in that it is made of a resin composition comprising

The components (A) to (D) will be described below. The aromatic polyester resin as the component (A) is a polyester having an aromatic ring as a chain unit of a polymer, and is a polycondensation containing an aromatic dicarboxylic acid and a diol (or an ester-forming derivative thereof) as main components. It is a polymer or copolymer obtained by the reaction.

Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, naphthalene-2,5-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, biphenyl 2,2. ′ -Dicarboxylic acid, biphenyl 3,3′-dicarboxylic acid, biphenyl-4,4′-dicarboxylic acid, diphenyl ether-4,4′-dicarboxylic acid, diphenylmethane-4,4′-dicarboxylic acid, diphenylsulfone-4,4 ′ -Dicarboxylic acid, diphenylisopropylidene-4,4′-dicarboxylic acid, 1,2-bis (phenoxy) ethane-4,4′-dicarboxylic acid, anthracene-
2,5-dicarboxylic acid, anthracene-2,6-dicarboxylic acid, P-terphenylene-4,4'-dicarboxylic acid, pyridine-2,5-dicarboxylic acid and the like can be mentioned.
Of the above aromatic dicarboxylic acids, terephthalic acid is most preferable.

The above aromatic dicarboxylic acids may be used as a mixture of two or more kinds. If it is a small amount, an aliphatic dicarboxylic acid such as adibic acid, azelaic acid, dodecanedioic acid, sebacic acid, etc., together with the aromatic dicarboxylic acid,
One or more alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid can be mixed.

Examples of the above diols include aliphatic diols, alicyclic diols, and a mixture of both. Examples of the aliphatic diol include ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, neopentyl glycol, 2-methylpropane-1,3-diol, diethylene glycol and triethylene glycol. Examples of the alicyclic diol include cyclohexane-1,4-dimethanol.

If the amount is small, the molecular weight is 400-6.
One or more 000 long chain diols may be copolymerized.
Examples of the long chain diol include polyethylene glycol,
Examples thereof include poly-1,3-propylene glycol and polytetramethylene glycol.

The aromatic polyester resins obtained by reacting the above aromatic dicarboxylic acid and diol are listed below. That is, as the polymer of the aromatic polyester resin, polyethylene terephthalate (PET), polypropylene terephthalate, polybutylene terephthalate (PBT), polyethylene naphthalate, polybutylene naphthalate, polyethylene-1,2-bis (phenoxy) ethane is used. Examples include -4,4'-dicarboxylate and polycyclohexanedimethanol terephthalate.

Examples of the above-mentioned aromatic polyester resin copolymers include polyethylene isophthalate / terephthalate, polybutylene terephthalate / isophthalate, polybutylene terephthalate / decane dicarboxylate and the like. Among the above polymers and copolymers, polyethylene terephthalate and polybutylene terephthalate are preferable as the component (A), and polybutylene terephthalate is particularly preferable.

Next, the block copolymer derived from the aromatic alkenyl compound and the diene monomer as the component (B) is of the type shown in the following (a) and (b). (A) ABA type or ABA 'type copolymer or a combination thereof (b) AB type diblock copolymer.

Here, A and A'are blocks derived from an aromatic alkenyl compound, for example, a comonomer such as styrene, α-methylstyrene, vinylxylene, vinylnaphthalene, or a mixture thereof. Also, B
Is a block derived from a diene monomer such as butadiene, chlorobutadiene, isoprene, a comonomer such as 1,3-pentadiene, 2,3-dimethylbutadiene, or a mixture thereof.

Next, the ABA type or ABA 'type copolymer in the component (a) is composed of three blocks which are directly bonded to each other, or an aromatic alkenyl compound and a diene type monomer which constitute the blocks. Is a so-called "tapered" type block copolymer bonded to each other via the random copolymer, or a radial teleblock type copolymer of an aromatic alkenyl compound and a diene monomer.

The AB type diblock copolymer in the component (b) is composed of two blocks which are directly bonded to each other, or is composed of an aromatic alkenyl compound and a diene monomer. It is a taper type die block copolymer which is bonded to each other through a random copolymer.

Specific preferred examples of the block copolymer of component (a) include styrene-ethylene-butadiene-styrene block copolymer and styrene-butadiene-
Examples thereof include a styrene block copolymer and a styrene-isoprene-styrene block copolymer. Further, preferred specific examples of the block copolymer of the component (b) include a styrene-ethylene-propylene block copolymer and a styrene-butadiene block copolymer.

In the block copolymer of the component (B), the block derived from the diene-based monomer may be hydrogenated. The block copolymer may be modified with, for example, an acid compound in order to improve compatibility (interfacial adhesion) with the polyester.

Next, the epoxy group- or oxazolinyl group-containing olefin polymer, which is the component (C), is a copolymer of an epoxy group- or oxozalinyl group-containing unsaturated monomer and an olefin monomer. Examples of the epoxy group- or oxazolinyl group-containing unsaturated monomer include the following. Preferred examples of the epoxy group-containing unsaturated monomer include glycidyl methacrylate, glycidyl acrylate, vinyl glycidyl ether, hydroxyalkyl (meth) acrylate glycidyl ether, polyalkylene glycol (meth) acrylate glycidyl ether, and glycidyl itaconate. To be

Next, a preferred oxazolinyl group-containing unsaturated monomer is represented by the following formula (Formula 1). Z in the equation
Is a substituent containing a polymerizable double bond.

[0024]

[Chemical 1]

As the above-mentioned substituent Z, the following (formula 2)
The substituent represented by the formula (Chem. 8) is preferable. Formula (2) above
In the formula (8), R is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group. Examples of the alkyl group include methyl group, i- and n-propyl group, and butyl group.

[0026]

[Chemical 2]

[0027]

[Chemical 3]

[0028]

[Chemical 4]

[0029]

[Chemical 5]

[0030]

[Chemical 6]

[0031]

[Chemical 7]

[0032]

[Chemical 8]

Among the oxazonyl group-containing unsaturated monomers in the above formulas (Chemical formula 1) to (Chemical formula 8), vinyl oxazoline represented by the following formula (Chemical formula 9) is most preferable. R in the formula is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an alkoxy group, and is most preferably a hydrogen atom or a methyl group, as in the formulas (Formula 2) to (Formula 8). Is.

[0034]

[Chemical 9]

As the olefinic monomer copolymerizable with the unsaturated monomer containing an epoxy group or an oxazolinyl group, ethylene, propylene, 1-butyne, 1-pentene, 4-methyl-1-pentene, 1- Hexen, 1-
Α-Olefins such as octene, 1-decene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene.

In addition to the above α-olefin, a small amount of diene component, unsaturated carboxylic acid and its derivative, aromatic vinyl monomer such as styrene, vinyl cyanide monomer such as acrylonitrile are copolymerized. It doesn't matter. The diene components include butadiene, isoprene, 1,4
-Hexadiene, 5-ethylidene-2-norbornene,
5-vinyl-2-norbornene and the like can be mentioned.

As the unsaturated carboxylic acid and its derivative, vinyl acetate, acrylic acid (salt), methacrylic acid (salt), acrylic acid ester, methacrylic acid ester, (anhydrous) maleic acid, maleic acid ester, 2 -Norbornene-5,6-dicarboxylic acid (anhydride). Further, the olefin polymer as the component (C) may have both an epoxy group and an oxazolinyl group.

Next, the flame retardant in the component (D) is preferably a brominated flame retardant. Examples of the brominated flame retardant include brominated epoxy, brominated polycarbonate, brominated bisphenol, brominated diphenyl ether and the like. The above-mentioned brominated flame retardant has the advantage of exhibiting a flame retardant effect even if added in a small amount.

As the flame retardant, it is also preferable to use an inorganic flame retardant together with a bromine flame retardant. Examples of the inorganic flame retardant include antimony trioxide, aluminum hydroxide, magnesium hydroxide and the like. These inorganic flame retardants have the advantage of increasing the effects of the above-mentioned brominated flame retardants.

In this case, it is preferable to add 20 to 100 parts of the inorganic flame retardant to 100 parts of the bromine flame retardant. Also, as a brominated flame retardant, brominated epoxy,
When using brominated polycarbonate, antimony trioxide is added as an inorganic flame retardant.

Next, the contents of the components (A) to (D) in the resin composition will be described. First,
The amount of the block copolymer as the component (B) is preferably 3 to 150 parts with respect to 100 parts (parts by weight) of the aromatic polyester resin as the component (A). When the amount of the component (B) is less than 3 parts, the impact resistance of the resin composition may decrease. On the other hand, if the amount is more than 150 parts, the mechanical properties of the resin composition may be significantly deteriorated. The upper limit of the content of component (B) is preferably 70 parts.

Next, with respect to 100 parts of the component (A),
The amount of the olefin polymer as the component (C) is preferably 3 to 120 parts. When the amount of the component (C) is less than 3 parts, the impact resistance of the resin composition may decrease. On the other hand, when it is more than 120 parts, the mechanical properties of the resin composition may be significantly deteriorated. In addition,
The upper limit of the content of the component (B) is preferably 70 parts. Further, it is also preferable that the components (B) and (C) are both 3 to 70 parts with respect to 100 parts of the component (A).
In this case, there is an advantage that the balance of impact resistance and mechanical properties is improved.

Next, with respect to 100 parts of the component (A),
The flame retardant of the component (D) is preferably 8 to 130 parts. When the amount of the component (D) is less than 8 parts, the flame retardancy of the resin composition may not be exhibited. On the other hand, 1
When it is more than 30 parts, there arises a problem that impact resistance and mechanical properties are remarkably deteriorated.

The flame retardant may be used in a low range of 28 to 32 parts, for example, 30 parts. The amount of the flame retardant mixed may be 8 to 130 parts as described above, but it is 2 due to the trade-off between flame retardancy and mechanical properties such as impact resistance.
The range of about 0 to 50 parts is particularly desirable. That is, 49 parts emphasize the flame retardancy and 30 parts emphasize the impact resistance. Both of them satisfy the flame retardancy and impact resistance required as a synthetic resin component in an internal combustion engine ignition device.

It is also possible to add substances other than the above-mentioned components (A) to (D) to the resin composition to the extent that the mechanical properties are not impaired. Examples of the above-mentioned additive substances include pigments and dyes, glass fibers and carbon fibers which are reinforcing agents, carbon black which is a filler, minerals and the like, heat resistance agents, antioxidants, fluidity improving agents and antistatic agents. To be

Next, the synthetic resin parts in the ignition device will be described as an example. That is, the ignition device is an ignition coil in an automobile engine, and the synthetic resin component in the ignition coil is a coil case. There are various forms of the coil case, but for example, there is one that integrally has a high-voltage tower to which a high tension cord is connected. Further, there is one having a central core and an outer peripheral core which are press-fitted therein (FIG. 1). Also,
In addition to this, there is also a coil case in which the high-voltage tower is a separate unit.

The above resin composition contains the above-mentioned various components, and the mechanical properties and impact resistance are greatly improved.
In addition, a flame retardant is also included in the above various components. Therefore, the ignition coil made of the above resin composition has flame retardancy, but satisfies the conditions of mechanical characteristics and impact resistance required for the ignition coil. Therefore, as described above, it is possible to press-fit the parts into the inside thereof, the ignition coil can be easily miniaturized, and the degree of freedom of the shape is high.

Incidentally, the connector, the coil bobbin, and the high-voltage tower which is a separate body from the coil case in the ignition coil can be made of the above synthetic resin parts. Further, examples of the ignition device include a distributor, a high tension cord, and the like other than the ignition coil, and synthetic resin parts thereof can be made of the above resin component.

[0049]

The present invention is an ignition device for an internal combustion engine, wherein a synthetic resin part of the ignition device is made of the resin composition of the above-mentioned components (A) to (D). There is.

Since the resin composition contains the specific component (D), it has excellent flame retardancy.
Further, since the component (B) and the component (C) are contained, mechanical properties and impact resistance are greatly improved. Therefore, the decrease in strength caused by the addition of the flame retardant is compensated for, and the composition has flame retardancy and mechanical properties at the same time.

Therefore, the synthetic resin part manufactured from the above resin composition can be made thin, and the insert can be easily press-fitted. Therefore, the ignition device using the above-mentioned synthetic resin parts can be easily miniaturized and has a high degree of freedom in shape. Therefore, it is possible to manufacture an igniter having excellent flame retardancy without changing the specifications of the igniter as seen when using a conventional synthetic resin part made of a flame-retardant material.

As described above, the present invention can provide an ignition device for an internal combustion engine, which is made of synthetic resin parts having excellent mechanical properties and flame retardancy.

[0053]

【Example】

Example 1 An ignition device for an internal combustion engine of the present invention will be described with reference to FIGS. 1 and 2. The ignition device of this example is an ignition coil integrated with a high-pressure tower used in an automobile engine. As shown in FIG. 1 and FIG. 2, the ignition coil 1 of this example comprises a coil case 11 and a coil boot 19 provided below the coil case 11, and the coil case 11 is connected to a high tension cord 8. It integrally has a high-voltage tower 12 for operating.

The coil case 11 has a central core 116 and an outer peripheral core 117 which are press-fitted therein. Around the central core 116, the primary coil 111 and the secondary coil 1 wound around the coil bobbins 113 and 114.
12 are arranged. In addition, reference numeral 115 is a connector,
Reference numeral 128 is an insulating encapsulating resin. 2 is shown in FIG.
FIG. 3 is a perspective view of the ignition coil shown in FIG. 1, in which a metal insert 18 for coil mounting is provided on the outer surface of the coil case 11. 1 is a sectional view taken along the line AA of FIG.

Next, an electrode 120 for attaching the high tension cord 8 is provided inside the high voltage tower 12, and the electrode 120 is connected to the coil through a metal terminal pin 129 and a connection plate 127. It is connected to the secondary coil 112 in the case 11. The cord 80 of the high tension cord 8 extends to the spark plug of another cylinder.

Next, inside the coil boot 19,
A spring 193 for connecting to the engine ignition plug 99 is provided, and the spring 193 is connected to the secondary coil 112 in the coil case 11 via the conductive metal pipe 192, the metal terminal pin 191 and the connection plate 198. It is connected to the.

The plug 99 is inserted into a plug hole 90 in the cylinder head 9 of the engine, and the tip 99 of the plug has a combustion chamber 91 of the engine.
It is arranged to project.

Next, in the ignition coil 1, the coil case 11, the high pressure tower 12, the coil boot 19, the coil bobbins 113 and 114, and the connector 115 are the synthetic resin parts according to the present invention. The synthetic resin parts are all made of a resin composition including the following components (A) to (D).

(A) 100 parts of polybutylene terephthalate as an aromatic polyester resin (parts by weight, the same applies hereinafter). (B) 12 parts of styrene / ethylene / butadiene / styrene block copolymer as a block copolymer derived from an aromatic alkenyl compound and a diene monomer.

(C) 10 parts of glycidyl methacrylate-modified polyethylene as an olefin polymer containing an epoxy group or an oxazolinyl group. (D) 30 parts of brominated epoxy as a brominated flame retardant in combination with antimony trioxide as an inorganic flame retardant. Further, in addition to the components (A) to (D), the resin composition contains 73 parts of glass fiber as a reinforcing material.

The operation and effect of this example will be described below. The coil case 11 in the ignition coil 1 of this example is
It is made of a resin composition comprising the components (A) to (D) described above. Therefore, the resin composition has excellent flame retardancy. Also, the mechanical properties are greatly improved. Therefore, the decrease in strength caused by the addition of the flame retardant is compensated for, and the composition has flame retardancy and mechanical properties at the same time. Therefore, the synthetic resin component manufactured from the above resin composition has high strength, can be made thin, and can easily press-fit the insert.

Therefore, in the coil case of this example,
There is no risk of cracks or the like accompanying the press-fitting of the central core and outer peripheral core. Also, the wall thickness of the coil case can be reduced. Therefore, the ignition coil of this example is excellent in flame retardancy and, in addition, its shape and size are the same as those of the conventional ignition coil.

Therefore, according to this example, it is possible to provide an ignition device for an internal combustion engine, which is made of synthetic resin parts having excellent mechanical properties and flame retardancy.

Example 2 In this example, a resin composition forming a synthetic resin part of an ignition device for an internal combustion engine will be described with reference to Tables 1 and 2 together with Comparative Examples for the performance of the sample according to the present invention. First,
Table 1 shows the components of the resin compositions of Samples 1 and 2, and Comparative Examples C1 to C4. In the table, PBT is polybutylene terephthalate, which is the aromatic polyester resin as the component (A) described above.

In the block copolymer and the modified block copolymer, the former is a styrene / ethylene / butadiene / styrene block copolymer and the latter is a maleic anhydride modified styrene / ethylene / butadiene / styrene block copolymer, It is the block copolymer of the component (B) described above.

The modified PE and modified EEA are glycidyl methacrylate modified polyethylene in the former and glycidyl methacrylate modified ethylene / ethyl acrylate in the latter, and are the above-mentioned olefinic polymers of the component (C). is there. The bromine-based flame retardant is a brominated epoxy that also uses antimony trioxide as an inorganic flame retardant and is the flame retardant of component (D) described above. Further, glass fiber as a reinforcing material is added to the above-mentioned samples and comparative examples.

Next, the contents of the above components in Table 1 will be described. All of the above contents are based on 100 parts by weight of PBT. Sample 1 comprises 100 parts by weight of PBT, 12 parts by weight of block copolymer, 10 parts by weight of modified PE, 49 parts by weight of brominated flame retardant, and 73 parts by weight of glass fiber. The same applies to Sample 2 and Comparative Examples C1 to C4. However, Comparative Examples C1, C2 and C4 do not contain a brominated flame retardant.

Next, the manufacturing method of the sample and the comparative example will be described. First, all the components (A) to (D) are premixed with a ribbon mixer to prepare a premix. Extruding the above premix in an extruder at 260 ° C,
Pellet. The obtained pellets are dried at 120 ° C. for 4 hours and then injection-molded at 255 ° C., which are used as samples and comparative examples.

The performance evaluation of the above-mentioned samples and comparative examples is carried out by measuring the Izod impact strength which is impact resistance, the tensile strength which is mechanical property and the high voltage insulation life. Also,
The results of the above measurements are shown in Table 2. The Izod impact strength is ASTM D256, and the tensile strength is ASTM D
638.

The high voltage insulation life is the same as that of the ignition coil of the first embodiment except that the samples 1 and 2 and the comparative examples C1 to C4 are used.
It is measured by mounting a coil case made of, and performing an ignition coil high voltage endurance test on the ignition coil. Then, in the above durability test, the judgment was made based on the life of the through leak in the high-voltage tower of the coil case. In addition, regarding the above-mentioned life, in Table 2, ○ is shown for those that can maintain the insulation performance for a sufficiently long time, and × is shown for those that can maintain the insulation performance for only a short time. In addition, △ is marked for those in between.

The above measurement results will be described below with reference to Table 2. First, the Izod impact strength usually required in the coil case is preferably 10 kgcm / cm or more. As shown in Table 2, the samples 1 and 2 and the comparative examples C1 and C2 satisfy this requirement. Further, Comparative Example C2 has the highest Izod impact strength. Samples 1 and 2 contain a flame retardant and satisfy the Izod impact strength value required for the coil case.

However, the above Comparative Examples C1 and C2 do not contain a flame retardant, and cannot be said to satisfy the property of flame retardance required for the ignition coil. In addition, Comparative Example 3
Contains a flame retardant, but its Izod impact strength is low and is not suitable for coil cases. Comparative Example C4 does not contain a flame retardant and has a low Izod impact strength, so that it is not suitable for a coil case. Therefore, the samples of the present invention are superior to the comparative examples in terms of Izod impact strength.

The tensile strength required for the coil case is preferably 1100 kg / cm ² or more. Table 2
As shown in FIG. 5, the samples 1 and 2 and the comparative example C1 satisfy this requirement. Sample 1 has the highest tensile strength. Samples 1 and 2 contain flame retardant,
It also satisfies the tensile strength required for the coil case.

However, the above Comparative Examples C1 and C2 do not contain a flame retardant and cannot be said to satisfy the properties required for the ignition coil. Comparative Example C3 contains a flame retardant, but has a low tensile strength value and is not suitable for a coil case. Comparative Example C4 does not contain a brominated flame retardant and has a low tensile strength, so it is not suitable for a coil case. Therefore, the sample of the present invention is superior to the comparative example also in tensile strength.

Further, the high voltage insulation life is excellent in Samples 1 and 2 and Comparative Examples C1 and C2, short in Comparative Example C3, and intermediate in Comparative Example C4. Therefore, the samples 1 and 2 according to the present invention are not only excellent in mechanical properties, but also excellent in insulation life, which is an electrically insulating property. As described above, the resin compositions of Samples 1 and 2 of this example and the coil cases produced from the resin compositions have flame retardancy, excellent mechanical properties, and electrical insulation.

In each of Samples 1 and 2 in Example 2 described above, 49 parts of the flame retardant was mixed.
The range may be as low as about 8 to 32 parts, for example, 30 parts as in the first embodiment. As the amount of flame retardant mixed,
As described above, the content may be 8 to 130 parts, but the range of about 20 to 50 parts is particularly desirable from the trade-off between flame resistance and mechanical properties such as impact resistance. Therefore, 49 parts emphasize the flame retardancy and 30 parts emphasize the impact resistance. Both of them satisfy the flame resistance and impact resistance required for the ignition coil case.

[0077]

[Table 1]

[0078]

[Table 2]

Embodiment 3 As shown in FIG. 3, this embodiment is a high-voltage tower integrated ignition coil 2 having a shape different from that of Embodiment 1. As shown in the figure, the ignition coil 2 is composed of a coil case 21 integrated with a high-voltage tower 22, a connector 215 is provided on a side surface of the coil case 21, and is press-fitted below the coil case 21. A core 28 is provided.

Further, inside the coil case 21, as in the first embodiment, primary coils, secondary coils, coil bobbins of these coils, etc. are provided. Note that reference numeral 280 is a stopper for installing the ignition coil. The coil case 21 is a synthetic resin part made of the same resin composition as in Example 1. Others are the same as those of the first embodiment, and the same effect as that of the first embodiment can be obtained.

Fourth Embodiment As shown in FIG. 4, this embodiment is a high pressure tower separate type ignition coil 3 different from the first embodiment. As shown in the figure, the ignition coil 3 is composed of a coil case 31 which is separate from the high-voltage tower 32, and a connector 315 is provided on the coil case 31. Further, in the inside of the coil case 31, as in the first embodiment, a primary coil, a secondary coil, and coil bobbins of these are provided. Reference numeral 38 is a metal insert. The coil case 31 is a synthetic resin part made of the same resin composition as in Example 1. Others are similar to those of the first embodiment, and similar effects can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an ignition coil for an automobile engine according to a first embodiment.

FIG. 2 is a perspective view of an ignition coil for an automobile engine according to the first embodiment.

FIG. 3 is a perspective view of an ignition coil for an automobile engine according to a third embodiment.

FIG. 4 is a perspective view of an automobile engine ignition coil according to a fourth embodiment.

[Explanation of symbols]

1. ． ． Ignition coil, 11. ． ． Coil case, 111. ． ． Primary coil, 112. ． ． Secondary coil, 115. ． ． connector, 116. ． ． Central core, 117. ． ． Outer core, 12. ． ． High voltage tower, 19. ． ． Coil boots, 8. ． ． High tension cord, 99. ． ． plug,

Continuation of front page (56) Reference JP-A-5-214209 (JP, A) JP-A-3-250044 (JP, A) JP-A-3-100371 (JP, A) JP-A-3-20351 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08L 23/00-23/36 C08L 53/02 C08L 67/00-67/02

Claims (6)

(57) [Claims] 1. A synthetic resin component for use in an ignition device for an internal combustion engine, wherein the synthetic resin component comprises (A) 100 parts (parts by weight, the same hereinafter) of an aromatic polyester resin, and (B) an aromatic alkenyl compound and 3-150 parts of a block copolymer derived from a diene monomer, and (C) an epoxy group- or oxazolinyl group-containing olefin polymer 3-
An ignition device for an internal combustion engine, which is made of a resin composition comprising 120 parts and (D) 8 to 130 parts of a flame retardant. 2. The ignition device for an internal combustion engine according to claim 1, wherein the ignition device is an ignition coil, and the synthetic resin component is a coil case. 3. The ignition device for an internal combustion engine according to claim 2, wherein the coil case integrally has a high pressure tower for connecting a high tension cord. 4. The ignition device for an internal combustion engine according to claim 2, wherein the coil case has a central core and an outer peripheral core that are press-fitted or inserted. 5. The method according to any one of claims 1 to 4,
The ignition device for an internal combustion engine, wherein the flame retardant is a brominated flame retardant. 6. The method according to any one of claims 1 to 4,
The ignition device for an internal combustion engine, wherein the flame retardant is a brominated flame retardant or an inorganic flame retardant.