KR100478171B1 - Ignition Device for Internal Combustion Engines - Google Patents

Abstract

The present invention relates to an ignition device housed in a cylinder head cover of an internal combustion engine and a plug opening formed by the cylinder head. The side core has a slit between two horizontally extending sidewall ends. The lateral core consists of two oriented silicon steel sheets and comprises one selected from a laminate structure each having a slit between two horizontally extending sidewall ends, the plurality of slits being aligned at substantially the same position. The slit prevents one turn short of the magnetic flux of the side core so that a predetermined secondary voltage higher than the engine required secondary voltage is obtained. The receiving body includes an independent and individual igniter receiving unit, and an independent and individual coil receiving unit, the igniter receiving unit and the coil receiving unit are combined.

Description

Ignition apparatus for internal combustion engines

The present invention relates to an ignition device for an internal combustion engine, and more particularly to a cylindrical ignition device for an internal combustion engine that is housed in a plug opening of an internal combustion engine.

The present invention relates to a cylindrical ignition device for an internal combustion engine comprising a cylindrical side core having a slit between vertical sidewall ends, wherein the side core with a slit comprises: a sheet of oriented silicon steel sheet, a sheet of non-oriented silicon steel sheet; , A laminated structure composed of at least two of a oriented silicon steel sheet and a non-oriented silicon steel sheet, and a laminated structure of at least two oriented silicon steel sheets.

The present invention relates to a cylindrical ignition device for an internal combustion engine having an accommodating body composed of an igniter case part and a coil case part, wherein the accommodating body is an independent and separate igniter accommodating part accommodating the igniter case part with a connector, It includes a separate coil housing.

The present invention relates to a sealing structure of an ignition device for an internal combustion engine, in particular a cylindrical ignition device housed in a plug opening of an internal combustion engine.

In a conventional ignition device for an internal combustion engine, for example, as disclosed in Japanese Patent Application Laid-Open No. 228,011 / 1990, the side core of the ignition device multiplexes one non-oriented silicon steel sheet to the outer case of the ignition device. And by lamination. The lateral core comprises a non-oriented silicon steel sheet having a grade of 6.5 weight percent silicon, the non-oriented silicon steel sheet having a sheet thickness of 0.1 mm.

However, in the above-described conventional ignition device, the ignition device requires a lot of time to spirally manufacture the side cores, which makes the ignition device for the internal combustion engine expensive.

In addition, the side core structure of the above-described conventional ignition device is completely multiplely overlapped with the entire outer circumference of the outer case. In other words, the side core structure forms no gap or space at all on the outer circumference of the outer case in the horizontal direction of the outer circumference of the outer case.

As a result, the conventional ignition apparatus has a low secondary voltage, cannot obtain the required secondary voltage along the circumference, and cannot reliably generate sparks in the internal combustion engine.

In the above-described conventional ignition device, regardless of the material or length of the cylinder head cover or cylinder head of the internal combustion engine in which the plug opening for receiving the ignition device is formed, the side core is wound to have substantially the same cross-sectional area as the center core.

Further, in the aforementioned Japanese Patent Application Laid-Open No. 228,101 / 1990, the ignition device has two magnets provided on both ends of the center core. These magnets generate magnetic flux in the magnetic path in a direction opposite to the magnetic flux generated by the primary coil. As a result, the ignition device for an internal combustion engine becomes expensive.

The conventional cylindrical ignition device for an internal combustion engine has an outer case and an igniter case part (IC package type unit), the main body of the cylindrical ignition device is realized as an integral body, the connector is integrally formed with the igniter case part and the upper part of the igniter case part. Are arranged adjacent to.

In the above-described conventional ignition device, when the ignition device body is an ignition device of the type that is housed in the plug opening (typically, 23 to 25 mm in diameter), due to the size problem, the outer case of the igniter accommodation portion has a plug opening. Protrude to the top of the. The outer case of the igniter compartment also has a complicated stepped portion.

As a result, the accuracy of the cylindrical dimension of the coil housing cannot be secured, or the overall length of the ignition device becomes long because the connector is arranged on the upper part of the igniter case.

In addition, since the ignition device is arranged adjacent to the combustion chamber of the internal combustion engine, the environmental temperature in the plug opening reaches up to 150 ° C. Therefore, the ignition apparatus needs to cope with harsh heat resistant environmental conditions.

On the other hand, with regard to the connector structure, the connector needs to counteract the impact force. This impact force is applied at the time of installation, installation or maintenance of the ignition device.

Therefore, the ignition device needs to correspond to a connector having different specifications according to the type of internal combustion engine and the type of control device.

In a conventional ignition device for an internal combustion engine, the sealing structure of the ignition device has a sealing rubber member that prevents leakage of water from the plug opening to the cylinder head cover of the internal combustion engine. The sealing rubber member is completely received inside the plug opening, and the receiving rubber portion of the sealing rubber member seals in the radial direction of the plug opening.

It is an object of the present invention to provide an ignition device for an internal combustion engine, through which the effective magnetic flux of the central core portion can most effectively pass.

Another object of the present invention is to provide an ignition apparatus for an internal combustion engine in which stray capacitance generated between the secondary coil and the side core can be reasonably canceled.

It is a further object of the present invention to provide an ignition device for an internal combustion engine in which the thickness or length of the side core can vary depending on the material and length of the cylinder head or cylinder head cover of the internal combustion engine in which the plug opening for receiving the ignition device is formed. will be.

It is a further object of the present invention to provide an ignition apparatus for an internal combustion engine, in which the number or thickness of the magnets inserted at one or both ends of the central core can vary, as a result of which a low cost ignition apparatus for the internal combustion engine can be obtained. will be.

It is yet another object of the present invention to provide an ignition device for an internal combustion engine in which the ignition device can cope with actual environmental conditions or various required connector specifications.

Another object of the present invention is to provide an ignition device for an internal combustion engine, in which an ignition device having an extremely high reliability can be obtained.

A further object of the present invention is to provide an ignition apparatus for an internal combustion engine, in which slip-off between the sealing rubber member and the plug opening can be reliably prevented.

According to the present invention, an ignition device for an internal combustion engine includes a silicon steel sheet arranged around a center core, a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, an outer case, and an outer circumference of the outer case. It comprises a side core made by using a primary coil and a secondary coil is arranged between the central core and the outer case, the ignition device is received in the plug opening formed by the cylinder head cover and the cylinder head of the internal combustion engine.

The side core has a slit between the two horizontally extending sidewall ends, and the slit prevents a one-turn short of the magnetic flux of the side core so that a predetermined secondary voltage higher than the engine required secondary voltage is obtained. do.

For the above-mentioned object, according to the present invention, when both the cylinder head cover and the cylinder head of the internal combustion engine are made of aluminum material, the side core is, for example, one piece having a sheet thickness of 0.3 to 0.5 mm. The silicon steel sheet or one non-oriented silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm is rounded in a substantially tubular shape.

For the above purpose, according to the present invention, when both the cylinder head cover and the cylinder head of the internal combustion engine are made of aluminum material, the side cores are, for example, two sheets each having a plate thickness of 0.3 to 0 5 mm, respectively. Or one non-oriented silicon steel sheet having a total sheet thickness of 0.6 mm or more by stacking three oriented silicon steel sheets in a substantially tubular shape, or having a plate thickness of 0.3 to 0.5 mm, and 0.3 to 0.5 mm, respectively. At least one sheet of oriented silicon steel sheet having a sheet thickness was laminated in a substantially tubular shape to have a total sheet thickness of 0.6 mm or more.

In both cases described above, the upper end of the side core is positioned substantially the same as the upper end of the cylinder head cover, or lower than the upper end of the central core.

If the cylinder head of the internal combustion engine is made of aluminum material and the cylinder head cover of the internal combustion engine is made of thermoplastic PVC material (e.g. polypropylene, nylon 6, nylon 66, nylon 12, etc.), the side core is For example, one oriented silicon steel sheet having a plate thickness of 0.3 to 0.5 mm or one non-oriented silicon steel sheet having a plate thickness of 0.3 to 0.5 mm is formed in a round shape in a substantially tubular shape.

If the cylinder head of the internal combustion engine is made of aluminum material and the cylinder head cover of the internal combustion engine is made of thermoplastic synthetic resin material (such as polypropylene, nylon 6, nylon 66, nylon 12, etc.), the side core is an example For example, two or three oriented silicon steel sheets each having a plate thickness of 0.3 to 0.5 mm are roundly laminated in a tubular shape and have a total plate thickness of 0.6 mm or more, or 1 having a plate thickness of 0.3 to 0.5 mm. Each non-oriented silicon steel sheet and at least one oriented silicon steel sheet each having a sheet thickness of 0.3 to 0.5 mm are roundly laminated in a substantially tubular shape to have a total sheet thickness of 0.6 mm or more.

In both cases described above, the upper end of the side core is positioned substantially the same as the upper end of the cylinder head, or the upper end of the side core is positioned lower than the upper end of the center core.

The cylinder head of the internal combustion engine is made of aluminum material, the cylinder head cover of the internal combustion engine is made of thermoplastic synthetic resin material (such as polypropylene, nylon 6, nylon 66, nylon 12, etc.), and the iron plug tube is flame retardant When press-fitted into the plug opening of the engine, the side core is roughly a single oriented silicon steel sheet having a plate thickness of 0.3 to 0.5 mm or one non-oriented silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm, for example. It is formed by rounding it in a tubular shape.

The cylinder head of the internal combustion engine is made of aluminum material, the cylinder head cover of the internal combustion substrate is made of thermoplastic synthetic resin material (such as polypropylene, nylon 6, nylon 66, nylon 12, etc.), and the iron plug tube is flame retardant When pressure-inserted into the plug opening of the engine, the side core has a total plate thickness of 0.6 mm or more by stacking two or three oriented silicon steel sheets each having a plate thickness of 0.3 to 0.5 mm in a round shape in a substantially tubular shape, or Or a total thickness of 0.6 mm or more by laminating one non-oriented silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm and at least one oriented silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm in a substantially tubular shape. Has

In both cases described above, the upper end of the side core is located approximately equal to the upper end of the higher side of the upper end of the cylinder head and the upper end of the steel plug tube, or lower than the upper end of the center core.

The magnet generates a magnetic flux in the magnetic path in a direction opposite to the magnetic flux generated by the primary coil, and the magnet is provided at either or both ends of the central core.

When both the cylinder head and the cylinder head cover are made of aluminum material, a magnetic flux of good efficiency can be generated by inserting magnets at both ends of the side core.

When the cylinder head is made of aluminum material and the cylinder head cover is made of thermoplastic synthetic resin material, a magnetic flux of good efficiency can be generated by inserting a magnet at either end of the center core.

In the case described above, a magnetic flux of better efficiency can be generated by inserting a magnet into the center core on the cylinder head side made of aluminum than on the cylinder head cover side made of thermoplastic synthetic resin material, thereby obtaining an inexpensive ignition device for an internal combustion engine. .

According to the present invention, an ignition device for an internal combustion engine includes a central core, a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, an outer case, and a side core arranged around an outer periphery of the outer case. And an accommodating main body for accommodating the igniter case portion and the coil case portion, the igniter case portion having a connector arranged electrically and in close proximity, wherein the primary coil and the secondary coil are arranged between the center core and the outer case.

The receiving body includes an independent and individual igniter receiving unit, and an independent and individual coil receiving unit, the igniter receiving unit and the coil receiving unit are combined.

According to the present invention, an ignition device for an internal combustion engine includes a central core, a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, an outer case, and a side core arranged around an outer periphery of the outer case. And an accommodating main body accommodating the igniter case part and the coil case part, and a sealing member for sealing the periphery of the inner and outer surfaces of the plug opening portion of the internal combustion engine, wherein the igniter case part has an electrically connected and closely arranged connector, 1 The primary coil and the secondary coil are arranged between the center core and the outer case.

The accommodating body includes an independent and individual igniter accommodating portion and an independent and individual coil accommodating portion, the igniter accommodating portion accommodates the igniter case portion at the portion where the sealing member is fitted, and the igniter accommodating portion and the coil accommodating portion are combined.

The above object of the present invention is achieved by an ignition device for an internal combustion engine including an igniter portion having an electrically connected and closely arranged connector, a coil case portion, and an accommodating main body accommodating the igniter portion and the coil case portion.

The ignition device for an internal combustion engine comprises a receiving body having two parts, which are composed of independent and individual coil housings and independent and individual igniter housings. The coil accommodating portion houses the coil case portion and is inserted into a standardized plug opening of the internal combustion engine, and the igniter accommodating portion has a connector accommodating the igniter casing portion and arranged on the outer surface of the plug opening and connectable to other connectors having different specifications.

The coil receiver and the igniter receiver are integrally coupled at the coupling portion.

Further, another basic feature of the present invention is an igniter portion having an electrically connected and closely arranged connector, a coil case portion, an accommodating body accommodating the igniter portion and a coil case portion, and an internal combustion engine inserted into the accommodating body. An ignition device for an internal combustion engine comprising a sealing body to block the environment inside and outside the plug opening.

The ignition device for an internal combustion engine includes a receiving body having two parts consisting of an independent and separate igniter receiving portion and an independent and individual coil receiving portion at the portion where the sealing body is fitted. The coil accommodating portion houses the coil case portion and is inserted into the plug opening, and the igniter accommodating portion accommodates the igniter casing portion and is arranged on the outer surface of the plug opening, and has a connector connectable to other connectors having different specifications.

The coil receiver and the igniter receiver are integrally coupled at the coupling portion.

According to the present invention, the ignition device may correspond to the difference in the actual mounted environmental conditions or various required connector specifications.

According to the present invention, an ignition device for an internal combustion engine includes a central core, a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, an outer case, and a side core arranged around an outer periphery of the outer case. The primary coil and the secondary coil are arranged between the central core and the outer case, the ignition device is received in the plug opening and the plug tube formed by the cylinder head cover and the cylinder head of the internal combustion engine, the spark plug is Arranged under the plug opening, the ignition device further includes an inner cylindrical portion inserted into the plug opening and a sealing rubber member inserted into the inner cylindrical portion of the ignition apparatus to prevent penetration of water into the plug opening.

The sealing rubber member comprises a flange portion and a conical portion, the flange portion of the sealing rubber member has a radially extending surface, the extending surface contacting the tip portion of the cylinder head cover from the axial direction, which can be bent axially and radially Of the sealing rubber member can be tapered in the direction of the spark plug to guide the sealing rubber member when the cone of the sealing rubber member is inserted into the plug tube.

In the following, an embodiment of an ignition device for an internal combustion engine according to the present invention will be described with reference to Figs.

Fig. 1 is a sectional view showing an embodiment of an ignition device for an internal combustion engine according to the present invention, and Fig. 2 is a horizontal sectional view showing an ignition device for an internal combustion engine.

The ignition device (ignition coil) 10 for an internal combustion engine is mainly a primary bobbin 11, a primary coil 12, a secondary bobbin 13, a secondary coil 14, an outer case 15, and an epoxy resin material. A member 16, a central core (open core) 17, a side core (outer iron core) 18, and a flexible epoxy resin material member 19 are included.

The ignition device (ignition coil) 10 includes a magnet 20, a high voltage terminal 21, a spring member 22, a rubber boot member 23, and a pre-ignition ignition prevention high voltage arranged at the lower end of the primary bobbin 11. It further includes a diode 24, a sealing rubber member 25 and an igniter unit 30.

The igniter unit 30 includes a box-shaped metal base 36 made of copper or aluminum, and a power transmission chip 31 and a composite IC circuit 38 are provided on the metal base 36. The igniter terminal 32 is bonded to the terminal stand 37 integrally formed on the metal base 36 using the adhesive 39. The igniter terminal 32 is connected to the primary coil terminal 33 and the connector side terminal 35. The igniter unit 30 has a connector 34.

The center core 17 is arranged at the center of the ignition device 10, and this center core 17 is made by laminating oriented silicon steel sheets under a pressing operation. The primary bobbin 11 is fitted around the outer periphery of the central core 17, and the primary coil 12 composed of enameled wire or the like is wound in a circular shape around the outer periphery of the primary bobbin 11.

The secondary bobbin 13 is disposed inside the primary bobbin 11. The plurality of divided secondary coils 14 are wound around the secondary bobbin 13 at predetermined intervals. The outer case 15 is disposed around the outer periphery of the primary bobbin 11.

The outer case 15 includes an igniter case portion 15a and a coil case portion 15b, and the coil case portion 15b has a vertically extending protruding member 15b1 at an outer portion thereof. The side core 18 is arranged outside the coil case portion 15b of the outer case 15.

Fig. 3A is a perspective view showing the inner sheet of the side core of the ignition device for an internal combustion engine according to the present invention, and Fig. 3B is a perspective view showing the outer sheet of the side core of the ignition device for an internal combustion engine according to the present invention.

The side core 18 includes a structure laminated with two silicon steel plates 18a and 18b of an inner silicon steel plate 18a and an outer silicon steel plate 18b. Each of the two silicon steel sheets 18a and 18b is manufactured using one oriented silicon steel sheet.

The inner sheet 18a of the side core 18 is manufactured using a sheet of oriented silicon steel sheet having a sheet thickness of 0.35 mm. The inner sheet 18a is formed in a substantially tubular shape with vertically extending slits 18a1. This inner sheet 18a is disposed around the outer periphery of the outer case 15, and the protruding member 15b1 of the coil case portion 15b is located in the slit 18a1 of the inner sheet 18a. The protruding member 15b1 of the coil case part 15b does not necessarily have to be provided on the coil case part.

The outer sheet 18b of the side core 18 is manufactured using one sheet of oriented silicon steel sheet having a sheet thickness of 0.35 mm. The outer sheet 18b is formed in a substantially tubular shape with vertically extending slits 18b1. This outer sheet 18b is stacked and superimposed on the outer periphery of the inner sheet 18a.

Thus, the laminate structure of the side core has an overall sheet thickness of 0.7 mm including the inner sheet 18a. The outer sheet 18b is disposed around the outer periphery of the outer case 15, and the protruding member 15b1 of the coil case portion 15b is located in the slit 18b1 of the outer sheet 18b.

That is, in the above embodiment of the ignition device 10 according to the present invention, the laminated structure of the side core 18 composed of the inner sheet 18a and the outer sheet 18b is the inner sheet 18a having the slit 18a1. Gaps (spaces) g are formed between the vertical sidewall ends of the shell) and between the vertical sidewall ends of the outer sheet 18b with the slit 18b1.

The slit 18a1 of the inner sheet 18a forming the gap g and the slit 18b1 of the outer sheet 18b forming the gap g are formed by the protruding members 15b1 of the coil case part 15b. Electrically separated, the slits 18a1 and 18b1 of the side core 18 prevent one turn short of magnetic flux.

Regarding the oriented silicon steel sheet and the non-oriented steel sheet used for the side core 18 of the ignition device 10, the plate thickness of the commercial silicon steel sheet provided has four types of 0.23 mm, 0.3 mm, 0.35 mm and 0.5 mm. have.

In particular, in the present invention, one sheet of silicon steel sheet of 0.5 mm plate thickness can be used as one sheet structure, and a laminate structure made of two silicon steel sheets of 0.35 mm plate thickness (0.7 mm overall sheet thickness) is used. Can be.

The primary bobbin 11 is manufactured using a thermoplastic synthetic resin material such as, for example, modified polyphenylene oxide (hereinafter referred to as "modified PPO" or the like).

In order to prevent the occurrence of dielectric breakdown in which electric field concentration occurs by peeling off the epoxy resin material member 16 for insulating between the primary bobbin 11 and the high voltage after the thermal shock test, the above-described primary bobbin is made of the epoxy resin material member. Considering the adhesiveness of (16), it is prepared using modified PPO.

Since the ignition apparatus 10 for internal combustion engines by this invention is provided in the plug opening part of an internal combustion engine, it is preferable to use modified PPO which has a heat distortion temperature of 150 degreeC or more as a material for the primary bobbin 11.

Fig. 4A is a side view showing a primary bobbin structure provided with grooves or notches of an ignition device for an internal combustion engine according to the present invention, and Fig. 4B is a plan view showing a primary bobbin provided with grooves in Fig. 4A.

In addition, as shown in Figs. 4A and 4B, two vertically extending grooves (notches) 11a and 11b are provided on the primary bobbin 11, and each of the grooves 11a and 11b is a primary coil. It has a depth of 0.1-0.5 mm so that the winding part of 12 may easily permeate the epoxy resin material member 16 for high voltage insulation.

The primary coil 12 is wound around the enamel wire having a diameter of 0.3 to 1.0 mm in a total of about 100 to 300 times. This enamel line is laminated and wound in several layers wound several times each layer.

The secondary bobbin 13 is made of a thermoplastic synthetic resin material (for example, modified PPO or the like), and the secondary coil 14 is wound on the secondary bobbin 13. The secondary bobbin 13 is disposed between the central core 17 and the secondary coil 14, and the secondary bobbin 13 serves to insulate the high voltage generated in the secondary coil 14.

Here, since the center core 17 floats away from the ground portion GND, the center core 17 has an intermediate potential of the voltage generated in the secondary coil 14. In order to insulate the potential difference between the central core 17 and the secondary coil 14, the secondary bobbin 14 has a thickness of 0.5 to 1.2 mm.

In addition, in order to prevent electric field concentration between the secondary coil 14 and the central core 17, a flexible epoxy resin material member 19 is vacuum-injected inside the secondary bobbin 13. The secondary coil 14 is formed using an enamel wire having a wire diameter of 0.03 to 0.06 mm, and is dividedly wound around 10,000 to 30,000 times as a whole.

The outer case 15 is manufactured using a thermoplastic synthetic resin material (for example, polybutylene terephthalate ("PBT" in the text) or polyphenylene sulfide ("PPS" in the text)) and the like.

The outer case 15 described above has a gate on the high voltage side and can prevent the generation of voids on the high voltage side. The central core 17 is laminated under pressing operation with a oriented silicon steel sheet having a sheet of 0.2 to 0.7 mm thickness.

In the case where the ignition device (ignition coil) 10 is mounted on the plug opening of the internal combustion engine, the magnet 20 provided on the lower side of the side core 18 and the center core 17 is effective in the center core 17. It is arranged to pass the magnetic flux Øx as much as possible and to reasonably dissipate the stray capacitance C generated between the secondary coil 14 and the side core 18.

As shown in Fig. 5, when the ignition device 10 is mounted on the plug opening of the internal combustion engine, the effective magnetic flux Øx is the magnetic flux Ø1 of the side core 18 portion of the internal combustion engine and the magnetic flux of the plug opening. Separated by (Ø0).

By the magnetic flux Ø0 of the plug opening of the internal combustion engine, when the head cover having one turn shot of the internal combustion engine is made of aluminum material, the thickness of the side core 18 and the ignition device (ignition coil) 10 The relationship between the secondary voltages of is expressed as

Øx ≒ Ø1 + Ø0

V ₂ ≒ N x dØx / dt

V _{2 '} ≒ N xd (Øx- Ø0) / dt

Here, V ₂ is the secondary voltage of the single ignition device, V _{2 ′} is the secondary voltage of the ignition device mounted on the internal combustion engine.

In the above embodiment of the ignition device 10 according to the present invention, the side core 18 is formed by laminating two oriented silicon steel sheets each having a plate thickness of 0.35 mm, and having a total plate thickness of 0.7 mm. Since 18) is formed on the outer case 15, the engine required secondary voltage can be solved as a result.

FIG. 6 shows the relationship between the length of the side core 18 and the secondary voltage of the ignition device 10 when the cylinder head and the cylinder head cover of the internal combustion engine are made of aluminum material.

As shown in Fig. 6, it is preferable to position the upper end of the side core 18, for example, above the upper end of the cylinder head cover of the internal combustion engine in which the plug portion is formed.

That is, specifically, the upper end of the side core 18 is positioned above the upper end of the cylinder head cover, or the upper end of the side core 18 is positioned about 10 mm lower than the upper end of the cylinder head cover.

In the above-described configuration, since the secondary voltage V1 of the ignition device 10 is larger than the engine required secondary voltage V2 required by the engine, an ignition device (ignition coil) for reliably igniting the internal combustion engine ( Good flame conditions in 10) can be obtained.

Fig. 7 is a sectional view showing an ignition device for an internal combustion engine according to the present invention, wherein the cylinder head and cylinder head cover of the internal combustion engine are made of aluminum material.

In Fig. 7, the aluminum cylinder head 41a and the aluminum cylinder head cover 42a form a plug opening 43a for accommodating the ignition device (ignition coil) 10. The spark plug 44a is arranged at the bottom of the ignition device 10.

When the upper end 18c of the side core 18 is equal to or higher than the upper end 42a1 of the cylinder head cover 42a of the internal combustion engine, the secondary voltage of the ignition device 10 does not change.

However, when the upper end 18c of the side core 18 is lower than the upper end 42a1 of the cylinder head cover 42a of the internal combustion engine, the secondary voltage of the ignition device 10 is lowered.

A notch (slit 18a or slit 18b) is provided on at least one portion of the outer circumference of the side core 18 described above, which notch 18a or 18b can prevent one turn short.

Here, when the cylinder head 41a and the cylinder head cover 42a are manufactured using an aluminum material, the side cores 18 are two or three oriented silicon steel sheets each having a plate thickness of 0.3 to 0.5 mm. Is formed by roundly laminating a tubular shape so that the side cores 18 formed in the laminated structure have a total plate thickness of 0.6 mm or more.

The upper end 18c of the side core 18 is located approximately equal to the upper end 42a1 of the cylinder head cover 42a, or is located below the upper end 17a of the center core 17.

Fig. 8 is a sectional view showing an ignition device for an internal combustion engine according to the present invention in which the cylinder head of the internal combustion engine is made of aluminum material and the cylinder head cover is made of thermoplastic synthetic resin material.

In Fig. 8, the cylinder head 41b made of aluminum and the cylinder head cover 42b made of thermoplastic synthetic resin form a plug opening 43b which houses the ignition device (ignition coil) 10. The spark plug 44b is arranged at the bottom of the ignition device 10.

When the cylinder head 41b is made of aluminum material and the cylinder head cover 42b is made of thermoplastic synthetic resin material (e.g., polypropylene, nylon 6, nylon 66, nylon 12, etc.), The side core 18 is formed in a tubular round shape with one or two oriented silicon steel sheets each having a plate thickness of 0.3 to 0.5 mm, so that the side core 18 is formed by one directional sheet or 0.6 It is formed by a laminated structure having a total plate thickness of at least mm.

The upper end 18c of the side core 18 is located approximately the same as the upper end 41b1 of the cylinder head 41b or lower than the upper end 17a of the center core 17.

Fig. 9 is a sectional view showing an ignition device for an internal combustion engine according to the present invention in which the cylinder head is made of aluminum material, the cylinder head cover is made of thermoplastic synthetic resin material, and the iron plug tube is inserted into the plug opening for receiving the ignition device. to be.

In Fig. 9, the cylinder head 41c made of aluminum and the cylinder head cover 42c made of thermoplastic synthetic resin form a plug opening 43c for accommodating an ignition device (ignition coil) 10. The iron plug tube 45 is mounted on the cylinder head 41c and covers the ignition device 10. The spark plug 44c is arranged at the bottom of the ignition device 10.

The cylinder head 41c is made of aluminum material, the cylinder head cover 42c is made of thermoplastic synthetic resin material (e.g., polypropylene, nylon 6, nylon 66, nylon 12, etc.), and the iron plug tube ( When 45 is press-inserted into the plug opening 43c of the internal combustion engine, the side core 18 roughly pipes one non-oriented silicon steel sheet or two oriented silicon steel sheets having a plate thickness of 0.3 to 0.5 mm. Formed by laminating roundly in shape, for example, the side core 18 is formed of one non-oriented silicon steel sheet having a plate thickness of 0.5 mm, or formed of a laminated structure having a total plate thickness of 0.6 mm or more.

The upper end 18c of the side core 18 is positioned approximately equal to the upper end of the higher side of the upper end 41c1 of the cylinder head 41c and the upper end 45a of the steel plug tube 45, or the center core ( It is located lower than the upper end 17a of the 17).

Various ways of installing the magnet 20 in the central core 17 will be described with reference to FIGS. 10A, 10B and 10C.

As shown in FIG. 10A, a magnet 20a is provided at the upper end of the center core 17. As shown in FIG. This magnet 20a generates magnetic flux in the direction opposite to the magnetic flux formed by the primary coil 12.

As shown in Fig. 10B, a magnet 20b is provided at the lower end of the center core 17. Figs. This magnet 20b generates magnetic flux in the direction opposite to the magnetic flux formed by the primary coil 12.

As shown in Fig. 10C, two magnets 20c and 20d are provided at the upper end and the lower end of the center core 17. Figs. These magnets 20c and 20d generate a magnetic flux in the direction opposite to the magnetic flux formed by the primary coil 12.

When both the cylinder head and the cylinder head cover are made of aluminum material, by inserting the magnets 20c and 20d at both ends of the center core 17 as shown in Fig. 10C, a magnetic flux of good efficiency can be generated.

On the other hand, when the cylinder head is made of aluminum material and the cylinder head cover is made of thermoplastic synthetic resin material, as shown in Figs. 10A or 10B, the magnet 20a or the magnet ( By inserting 20b), magnetic flux of good efficiency can be generated.

In this case, better magnetic flux can be generated by inserting the magnet 20a or the magnet 20b on one side of the aluminum cylinder head than on one side of the thermoplastic synthetic cylinder head cover of the central core 17. And thus a low cost ignition device 10 for use in an internal combustion engine can be obtained.

Further, in the case of the conventional ignition device, the installation position of the ignition coil cannot be located lower than the upper end of the center core.

11 is a cross-sectional view showing another embodiment of an ignition device for an internal combustion engine according to the present invention in which the installation position of the ignition device is lower than the upper end of the center core.

However, according to the present invention, as shown in Fig. 11, the installation position 46 of the ignition device (ignition coil) 10 can be lower than the upper end 17a of the center core 17.

As a result, the ignition device 10 can be installed in an internal combustion engine having a short distance from the installation position of the spark plug to the installation position 46 of the ignition device 10.

These components are concentrically positioned from the inner side of the ignition device 10 to the central core 17, the secondary coil 14, the primary coil 12, the outer case 15, and the side core 18 in turn. have.

These coil portions are inserted into the outer case 15 and insulate high voltage by an insulating layer 16 made of epoxy resin material or the like. As an epoxy resin, it is better than the glass transition point and glass transition temperature of 120 to 162 ° C after curing to improve thermal shock resistance (such as repeated tests of -40 ° C and 130 ° C) and high voltage withstanding characteristic under high temperature. An epoxy resin material 16 having a thermal expansion coefficient of 10 to 50 x 10 ^E-6 is used as an average value in the low temperature range.

12 is an explanatory diagram showing a heat flow generated in the ignition device for an internal combustion engine according to the present invention.

In the cylindrical ignition device 10 accommodated in the plug openings 43 (43a, 43b, 43c), the biggest problem is how the heat from the primary coil 12 causes the air outside the plug opening 43 of the internal combustion engine. Is it possible to release it?

Heat is generated in the primary coil 12 and the secondary coil 14. Generally, the heat generation amount of the secondary coil 14 is less than half of the heat generation amount of the primary coil 12, and the sum of the power losses in the primary coil 12 and the secondary coil 14 is less than approximately 4W. .

The heat described above is transferred to the air from the epoxy resin material 16 through the center core 17 into the air as shown in FIG. 12 and through the side core 18 and the epoxy resin material 16 through the side core 18. From the air flow into the air B.

For the reasons described above, when the relationship between heat (power loss), temperature rise in the primary coil 12, and ambient temperature around the outer circumference of the plug opening is expressed by thermal resistance, the thermal resistance of the ignition device is about 15 ° C /. W.

When the top of the plug opening is cooled by air, the thermal resistance of the ignition device 10 is about 5 ° C./W to 10 ° C./W.

As a result, the ignition apparatus 10 is comprised with the structure which has the epoxy resin material 16 excellent in thermal conductivity.

The high voltage generated in the secondary coil 14 is supplied to the spark plugs 44 (44a, 44b, 44c) through the high voltage terminal 21, the spring member 22 and the like. The part into which the spark plug 44 is inserted is insulated by a rubber boot 23 such as a silicon rubber member or the like.

Fig. 13 is a circuit diagram showing the structure of an igniter unit of the igniter case portion of the outer case of the ignition device for an internal combustion engine according to the present invention.

As shown in Fig. 13, the single chip igniter 50 provided on the upper portion of the coil portion is an insulation type bipolar transistor 51 (hereinafter referred to as " IGBT ") and the current limiting circuit 52 And an input register 53. The IGBT 51 includes a main insulated dipole transistor (main-IGBT) 54 and an auxiliary dipole transistor (auxiliary-IGBT) 55.

A current sensing load 56 is provided between the auxiliary-IGBT 55 and the ground portion GND. A two-way polysilicon Zener diode 57 is inserted between the gate and the collector of the IGBT 51, which diode 57 is configured to have excellent temperature characteristics. This diode 57 also clamps the primary voltage to 350 to 450 volts.

The bleeder resistor 58 is inserted between the input portion and the ground portion GND, and the contact current of the input signal connection portion is larger than 1 k ?. Sufficient connection reliability can be obtained even by soldering the terminal by Sn soldering.

In the above-described single chip igniter 50, as shown in Fig. 1, the metal base made of copper or aluminum for heat radiation is bonded by silicon adhesive at the lower part of the heat sink on the side to which the IGBT 51 is bonded. .

The IGBT 51 and the terminals are connected by aluminum wire and molded from an epoxy resin material to form a TO-3P type or a TO-220 type.

14 is a graph showing a comparative example of secondary voltages of respective internal combustion engines having different thicknesses of the side cores of the ignition apparatus for the internal combustion engine according to the present invention.

As can be seen from Fig. 14, according to this embodiment of the ignition device, even the internal combustion engine with the iron plug tube and the internal combustion engine with the aluminum cylinder head cover, the ignition device can obtain the required secondary voltage required. have.

The thickness and length of the side cores can vary depending on the material or the length of the cylinder head or cylinder head cover of the plug opening of the internal combustion engine.

In addition, the number or thickness of the magnets inserted into one or both ends of the central core can be varied, and as a result, a low-cost ignition device for an internal combustion engine can be obtained.

Fig. 15 is a sectional view showing a state where an embodiment of an ignition device for an internal combustion engine is mounted on an internal combustion engine.

One embodiment of the cylindrical ignition device 70 for an internal combustion engine according to the present invention is mounted on an internal combustion engine, as shown in FIG.

As shown in FIG. 16, the ignition device 70 has an outer case (receiving portion) 71 and a side core 72. As shown in FIG. The outer case 71 is provided with an igniter case part 71a (igniter accommodating part) and a coil case part 71b (coil accommodating part).

The internal combustion engine has a cylinder head 73 and a cylinder head cover 74. The spark plug 76 protrudes and is fixed to the combustion chamber of an internal combustion engine.

The ignition device 70 for the internal combustion engine is fixed to the cylinder head cover 74 by an installation bolt 80 via an installation portion 71h provided on the igniter case portion 71a. The coil case 71b of the ignition device 70 for the internal combustion engine is inserted into the plug opening 75.

This plug opening 75 is drilled on the cylinder head 73 and the cylinder head cover 74 which easily receive thermal energy generated in the combustion chamber. As a result, the coil case part 71b needs high heat resistance, such as about 710 degreeC.

The hole diameter and the hole depth of the plug opening 75 into which the coil case portion 71b is inserted are normalized to a predetermined rule for a predetermined kind of internal combustion engine.

Now, the igniter case portion 71a and coil case portion 71b constituting the outer case 71 of this embodiment of the ignition device 70 will be described with reference to FIGS. 16, 17, and 18. FIG.

16 is a perspective view showing an embodiment of an igniter case portion and a coil case portion of the ignition device for an internal combustion engine according to the present invention. Figure 17 is a perspective view showing one embodiment of an igniter case of the ignition device for an internal combustion engine according to the present invention. 18 is a perspective view showing one embodiment of a coil case of the ignition device for an internal combustion engine according to the present invention.

In Fig. 17, the igniter case portion 71a, which also functions as the connector 79, is formed of a PBT resin material to secure the impact strength and the dimensional accuracy required as the connector 79.

In particular, the connector 79, which also functions as the igniter case portion 71a, has various embodiments to correspond to other connectors having different specifications, and various kinds of igniter case portions 71a are manufactured.

Since the connector 79 fitting into another connector has a complicated shape, the connector 79 is manufactured by a slide molding process. Therefore, in order to manufacture the igniter case portion 71a which also functions as the connector 79, the igniter case portion 71a needs a material characteristic having excellent moldability.

As described above, when the outer case 71 is integrally formed as disclosed in the prior art, it is difficult to standardize the igniter case portion 71a having the connector 79 corresponding to other connectors having different specifications.

Therefore, as shown in Figs. 16, 17, and 18, the outer case portion 71 includes an independent and individual igniter case portion 71a and an independent and individual coil case portion 71b. Moreover, in order to integrate the igniter case part 71a and the coil case part 71b, the igniter case part 71a has the engaging part (namely, fitting part) with the coil case part 71b.

The fall prevention step part 71c and the rotation stop prevention and positioning protrusion part 71e are provided in the above-mentioned engagement part. In addition, the part which accommodates the igniter case 78 etc. as an igniter case part 71a forms a cup (inner box) form.

On the other hand, as shown in Fig. 18, the coil case portion 71b is inserted into the plug opening 75 standardized as described above. The coil case portion 71b is formed of a PPS resin material in consideration of heat resistance and the like.

The coil case 71b may be formed of a mixed resin material in which a modified polyphenylene oxide resin material ("modified PPO" or "modified PPO resin material") is blended with a PPS resin material as a compounding agent, for example, about 20%. have.

As a result, the engaging portion (i.e., fitting portion) is provided on the igniter case portion 71a to integrate the coil case portion 71b. The fall prevention step part 71d and the rotation stop prevention and positioning notch part 71f are provided in the above-mentioned engagement part.

Here, in order to take advantage of the standardization of the plug opening 75, the external dimensions of the coil case part 71b (for example, the diameter D20 of the stepped part 71d, the ignition, according to the dimensions of the plug opening 75 defined). Diameter d21 and overall length of the device case body can be unified. Therefore, the coil case part 71b can be shared.

In addition, the diameter D20 of the stepped part 71d has the same dimension as the diameter D20 of the stepped part 71c shown in FIG. In particular, the diameter D20 of the step portion 71c is the same as the diameter of the igniter case portion 71a manufactured in another form so as to correspond to other connectors D20 having different specifications. The diameter D20 of the stepped portion 71c is unified to utilize the standardization of the plug opening 75.

19 is a cross-sectional view showing a state in which an embodiment of both the coil case portion and the igniter case portion is integrally coupled at the coupling portion in accordance with the present invention in the coupling portion of the coil case portion and the igniter case portion.

The outer case 71 composed of the igniter case portion 71a and the coil case portion 71b has two parts to correspond to the difference in environmental conditions actually mounted and various connector specifications required.

However, in order to finally use it as the ignition apparatus 70 for an internal combustion engine, the igniter case part 71a and the coil case part 71b must be integrated integrally in a fitting part.

Therefore, the igniter case portion 71a and the coil case portion 71b are fitted at the engaging portion, that is, at the step portion 71c of the igniter case portion 71a and at the step portion 71d of the coil case portion 71b. Are combined at the fitting.

In other words, at the engaging portion (i.e., fitting portion) corresponding to the portion corresponding to the vicinity of the upper surface of the plug opening 75 for storing or inserting the igniter case portion 71a and the coil case portion 71b in the internal combustion engine. The igniter case part 71a and the coil case part 71b are fitted together and integrally coupled.

Specifically, in the case of the embodiment shown in Fig. 19, an adhesive 82 is applied to the V-shaped groove 71g provided on the joining portion. The joining portion is joined by gluing. That is, the joining portion is joined. In this case, the protrusion part 71e and the notch part 71f are engaged, and the rotation direction is fixed.

As described above, the outer case 71 according to the embodiment of the present ignition device includes an independent and individual igniter case portion 71a and an independent and individual coil case portion 71b. The above-described igniter case portion 71a is formed in various forms so as to correspond to other connectors having different specifications.

The coil case portion 71b described above has a standardized outline (diameter and full length) corresponding to the standardized plug opening 75. The igniter case portion 71a and the coil case portion 71b are coupled at the fitting portion.

In addition, the connection between the connector 79 and the axial direction of the coil case part 71b (that is, the axial direction of the plug opening 75) at the engagement surface (that is, the fitting surface) of the two step portions 71c and 71d. Orthogonality between directions (direction perpendicular to the hole axial direction of the plug opening 75) and between the axial center of the coil case portion 71b and the center of the installation portion 71h provided on the igniter case portion 71a. The dimensional accuracy of the distance of can be secured.

In other words, the contact surface of the two stepped portions 71c and 71d is perpendicular to the longitudinal axial direction of the coil case portion 71b (that is, the hole axial direction of the plug opening 75) and the coil case portion ( And a contact surface located concentrically with the axial center of 71b). Therefore, in the engaging portion, both of the stepped portions 71c and 71d can be fitted and strongly joined without deformation.

Table 1

Table 1 evaluates the required characteristics of the coil case portion 71b and the igniter case portion 71a to be used for the igniter case portion 71a which also functions as a material and a connector 79 for use in the coil case portion 71b. This is a table of materials for each location.

In Table 1, for the material for use in the coil case 71b and the connector 79, all the characteristic items required for each use, the order of excellent material properties, and the order of the required degree are expressed by?,?,? The results are shown.

That is, the required characteristics of the coil case portion 71b inserted into the plug opening 75 for accommodating the coil unit are mainly heat resistance and voltage resistance.

On the other hand, the required characteristics of the igniter case portion 71a which accommodates the igniter unit 78 and emphasizes the function as the connector 79 are mainly impact strength and chemical resistance.

As described above, each of the materials of the igniter case portion 71a and the coil case portion 71b, which are the outer case 71, have different required characteristics.

Therefore, the coil case 71b and the connector 79 (that is, the igniter case 71a) are preferably divided into two and integrally coupled structures, which will be understood from Table 1.

The material for satisfying the required characteristics of the connector 79 is, for example, a PBT resin material. On the other hand, the material which satisfies the required characteristic of the coil case part 71b is a PPS resin material or the mixed resin material of PPS and modified PPO, for example.

Here, when using a PPS resin material, it is necessary to consider about adhesiveness (or adhesiveness). That is, peeling may occur because of poor adhesion between the insulating epoxy resin material for filling and sealing and the coil case portion 71b, which may cause defects and possibly cause ignition failure.

Therefore, in order to ensure long-term insulation of the ignition device 70, it is necessary to maintain the adhesion between the epoxy resin material and the coil case portion 71b.

Specifically, it is desirable that thermal stress at -40 ° C and 130 ° C, such as the temperature environmental conditions of the internal combustion engine, be applied alternately and repeatedly so that no peeling occurs over 300 cycles.

When the PPS resin material was used alone as the material of the coil case part 71b, occurrence of peeling was confirmed in less than 300 cycles depending on the use conditions.

On the other hand, since the modified PPO has good adhesion to the epoxy resin material for insulation, the modified PPO is generally used as the material of the secondary coil of the ignition device. However, since the modified PPO is poor in chemical resistance, the modified PPO is not suitable for the part where the object is exposed to the outside atmosphere.

As described above, the sealing rubber member 77 as a sealing member inserted near the upper surface of the plug opening 75 of the internal combustion engine isolates the outside of the plug opening 75 from the inner environment.

In addition to preventing the penetration of water, the above-mentioned sealing rubber member 77 plays an important role of not exposing the coil case portion 71b to the outside atmosphere. Therefore, there is a possibility that the modified PPO can be used for the coil case portion 71b.

In the present specification, with respect to the material for the coil case portion 71b, the following mixed materials can be used. The mixed material includes a PPS resin material having excellent heat resistance, good chemical resistance and excellent voltage resistance, and a modified PPO having excellent adhesion to an epoxy resin material for insulation.

For example, the PPS resin material becomes the base material, and about 20% of the modified PPO is mixed with the PPS resin material, and thus, the coil case portion 71b is used by using a mixed material having the characteristics of the PPS resin material and the modified PPO. ) Is manufactured.

That is, as a material for the coil case part 71b, mixing the base material which has the material characteristic of the outstanding heat resistance and the withstand voltage, and the compounding agent which has the outstanding adhesive material characteristic with respect to the insulating resin material for insulating a coil part is carried out. desirable. Moreover, it is preferable to form the mixed material using the material characteristic which each resin material has.

In other words, it is possible to use the function of the sealing rubber member 77 to isolate the external and internal environment of the plug opening 75.

That is, the ignition device 70 used in the internal combustion engine includes an igniter portion having a connector 79 electrically connected and arranged in close proximity, a coil case portion 71b, a housing body 71 accommodating the igniter portion and the coil portion. ) 71a, 71b.

The housing main body 71 has two parts composed of a coil housing 71b and an igniter housing 71a. The coil accommodating portion 71b accommodates the coil portion and is inserted into the standard plug opening 75 of the internal combustion engine.

The igniter accommodating part 71a has the connector 79 which accommodates an igniter part, is located outside of a plug opening part, and is connected to the other connector which has a different specification. The coil accommodating portion 71b and the igniter accommodating portion 71a are integrally coupled at the engaging portion.

In particular, when an allowable range exists within the required environmental specification, it is possible to manufacture the coil case portion 71b and the igniter case portion 71a with the same material.

In this case, each of the coil case portion 71b and the igniter case portion 71a is formed separately, and an extrusion of a molding form suitable for the mold parting line direction, the injection gate position, and the respective shapes. Molding conditions, such as push-out pin position of the mold form, may be appropriately set.

Therefore, the defects caused by molding are reduced, and the advantage of manufacturing a case excellent in the squareness and dimensional accuracy described above can be sufficiently utilized. These advantages can extend the scope of use.

In this embodiment, it is preferable to use a PPS resin material in which heat resistance, chemical resistance and voltage resistance are well balanced in comparison with other resin materials.

In summary, the basic feature of the present invention is that, as the outer main body, the housing main body 71 includes two parts composed of the coil case part 71b and the igniter case part 71a.

The coil case part 71b functions as a coil accommodating part, and the coil case part 71b is inserted into the plug opening 75 which mainly receives the coil part and standardizes the hole diameter of the internal combustion engine.

The igniter case portion 71a functions as an igniter accommodating portion, and has a connector 79 which mainly receives the igniter portion and is connected to another connector having different specifications. The coil case portion 71b and the igniter case portion 71a are integrally coupled at the coupling portion.

That is, the housing main body 71 makes a boundary between the inside and the outside of the plug opening 75 of the internal combustion engine having different environmental requirements, which is determined according to the environment in which the housing main body 71 is disposed, so that It includes two parts composed of an igniter accommodating portion 71a located outside and a coil accommodating portion 71b inserted into the plug opening 75.

The coil housing 71b and the igniter housing 71a include components and are integrally coupled at the coupling portion.

Moreover, the coil case part 71b which accommodates an ignition apparatus main body, and the igniter case part 71a which functions as a connector 79, and accommodates the igniter unit 78 are isolate | separated.

The coil case part 71b is manufactured by using the synthetic resin material which has the outstanding heat resistance, the outstanding voltage resistance, and the outstanding adhesiveness with the resin material for coil insulation.

Fig. 20 is a cross-sectional view showing a state in which the coil case part and the igniter case part are integrally combined in the coupling part of the coil case part and the igniter case part according to another embodiment of the present invention.

As shown in Fig. 20, the coil case part 71b has an extension part (expansion part) extended by extending the step part 71d of the coil case part 71b along the bottom part of the igniter case part 71a.

Since the deployment is present, the squareness and the dimensional accuracy described above are improved. In particular, since the contact surface is expanded, the stability of the bond is obtained at the joint.

Since the deployment portion of the coil case portion 71b having excellent heat resistance covers the igniter case portion 71a, the heat resistance of the bottom portion of the igniter case portion 71a facing the cylinder head cover 74 and the like of the internal combustion engine can be improved. .

That is, even when the igniter case portion 71a made of a synthetic resin material having slightly poor heat resistance is used, the portion facing the cylinder head cover 74 or the like of the internal combustion engine provided outside the plug opening 75 is maximum. Advantages can be obtained corresponding to harsh environmental conditions reaching temperatures of 130 ° C.

The fixing between the coil case portion 71b and the igniter case portion 71a is a method of joining with an adhesive 82, a method of injecting and fixing using an epoxy resin material for filling insulation, a coil case portion 71b and an igniter case. After manufacturing the portion 71a in advance, it may be performed by a method of integrally molding and fixing the portion 71a. Any method can be used.

Fig. 21 is a sectional view showing a state in which the coil case part and the igniter case part are integrally combined in the coupling part of the coil case part and the igniter case part according to another embodiment of the present invention.

That is, this figure shows sectional drawing of the state in the shaping | molding of both cases according to the method of shaping and fixing integrally mentioned above.

In Fig. 21, the cross section has a left slide metal mold 83a1 and a right slide metal mold 83a2 for forming the metal mold and the core mold 83b, and an arrow shows the movable sliding direction of each mold.

In the case of the integral mold, one of the steps 71c or 71d is buried relative to the other side case to be integrally molded. As a result, the buried staircase serves as a takeout prevention or rotation stop prevention, and in one process during the molding process, the joining (joining) and the takeout prevention or rotation stop prevention are effectively achieved.

As described above, the igniter case portion 71a and the coil case portion 71b, which house the igniter unit 78 and the like and function as the connector 79, are molded separately. Thus, a cylindrical ignition device 70 for an internal combustion engine that satisfies the characteristics required for each of the connector 79 and the coil case portion 71b is obtained.

Further, the igniter case is formed such that the connector 79 extends in the transverse direction of the igniter unit 78, that is, the connector 79 extends in a direction perpendicular to the hole axial direction of the plug opening 75 of the internal combustion engine. The part 71a is located.

Therefore, the overall length in the longitudinal direction of the ignition device 70 for the internal combustion engine is shortened, thereby improving the space efficiency.

In addition, in general, the ignition device 70 is connected to a control device with other connectors having different specifications. Other connectors have different connector orientations and installation positions, and these connectors have different shapes corresponding to each internal combustion engine.

According to the present invention, the above correspondence can be performed by changing the dimensions of only the igniter case portion 71a side. Therefore, the common use of the igniter case portion 71a and the coil case portion 71b is achieved, standardization of components is realized, and an inexpensive ignition device for an internal combustion engine can be obtained.

According to the present invention, since the most appropriate dimensions and materials can be selected in accordance with the required specifications (characteristics), the strength and dimensional accuracy of the connector 79 of the ignition device 70 for the internal combustion engine and the coil portion can be selected. Durability is improved.

In addition, in the case of manufacture of the ignition device 70 for an internal combustion engine having various specifications, it can respond according to the change of only the igniter case part 71a, and common use of the coil case part 71b and the igniter case part 71a can be achieved. Can be.

Thus, for example, in the case of the cylindrical ignition device 70, the overall length is short, the dimensional accuracy and strength of the connector 79 is excellent, the thermal shock resistance and voltage resistance is excellent, the durability and reliability of the internal combustion engine ignition The device 70 can be obtained.

Next, a sealing rubber member and a sealing structure having the sealing rubber member of the ignition device for an internal combustion engine according to the present invention will be described.

Fig. 22 is a sectional view showing a sealing rubber member of the ignition device for an internal combustion engine according to the present invention, and Fig. 23 is a sectional view showing a sealing structure with a sealing rubber member of an ignition device for an internal combustion engine according to the present invention.

22 and 23, the structure and operation of one embodiment of the sealing rubber member and the sealing structure will be described.

As shown in Fig. 23, one embodiment of the ignition device 90 includes a coil case portion 91, a side core 92 having a plurality of hemispherical protrusions 92a, and a sealing rubber member 95. Include. The internal combustion engine has a plug tube 93 and a cylinder head cover 94.

In FIG. 23, D is the outer diameter of the inner cylinder of the ignition device 90, D9 is the inner diameter of the cylinder head cover 94, D5 is the inner diameter of the plug tube 93, and D4 is the protrusion of the side core 92. In FIG. It is the outer diameter of 92a.

As shown in Fig. 23, the sealing rubber member 95 has a conical portion 95a having an inner diameter D1, a stepped portion 95b, and an inner cylindrical portion having an inner diameter D2 and an outer diameter D3. 95c, a flange portion 95d forming a radially extending surface, an upper end portion 95e, a recessed portion 95f, and an outer cylindrical portion 95g. The stepped portion 95b is dimensioned such that D1 < D < D2, and the recessed portion 95f is provided on the flange portion 95d.

The sealing rubber member 95 having the above-described structure is press-inserted and fixed to the inner cylindrical portion of the ignition device 90.

Since the sealing rubber member 95 has a stepped portion 95b dimensioned such that D1 < D < D2, the pressure-in dimensional tolerance at the side of the cone portion 95a can be large. have.

That is, in the inner cylindrical portion 95c having the inner diameter D2 of the sealing rubber member 95, the inner diameter D2 of the inner cylindrical portion 95c is larger than the outer diameter D of the inner cylindrical portion of the ignition device 90. . Thus, the sealing rubber member 95 can be easily inserted into the inner cylindrical portion of the ignition device 90.

On the other hand, in the cone portion 95a having the inner diameter D1 of the sealing rubber member 95, the thickness of the cone portion 95a to be press-inserted can be completely fixed.

Further, since the pressure insertion dimension tolerance in the conical portion 95a of the sealing rubber member 95 becomes large, the pressure insertion force can also be large, and the ignition device 90 is connected to the plug tube 93 of the plug opening. When stored, turn-up of the conical portion 95a of the sealing rubber member 95 is prevented.

On the other hand, when the ignition device 90 is accommodated in the plug tube 93 of the plug opening, the inclined surface of the conical portion 95a of the sealing rubber member 95 serves as a guide member.

That is, in a state where the sealing rubber member 95 is inserted into the inner cylindrical portion of the ignition device 90, the sealing rubber member 95 has a cone portion 95a and a conical tip portion 95s of the cone portion 95a. . The cone portion 95a having the conical tip portion 95s has a tapered shape in which the outer diameter is gradually reduced toward the tip portion at the side of the spark plug.

The outer circumferential surface of the outer diameter D3 of the inner cylindrical portion 95c of the sealing rubber member 95 is in a non-contact state D3 < D9). Thus, the sealing rubber member 95 can be easily inserted into the plug opening.

The protrusion 92a of the side core 92 forming the inner cylinder portion has a protruding shape protruding toward all or a part of the outer circumference of the cylinder portion of the ignition device 90.

The tip portion 95s of the conical portion 95a of the sealing rubber member 95 becomes the tip portion on the spark plug side of the sealing rubber member 95 inserted into the inner cylindrical portion of the ignition device 90. The protrusion 92a of the side core 92 is located closer to the spark plug than the conical tip 95s of the cone 95a of the sealing rubber member 95.

The outer diameter D4 of the protrusion 92a of the side core 92 has a dimensional relationship of D <D4 <D5. The outer diameter of the conical tip portion 95s of the inserted sealing rubber member 95 is formed to be smaller than the outer diameter D4 of the protrusion 92a of the side core 92. Thus, overturning of the sealing rubber member 95 is prevented.

That is, with the sealing rubber member 95 inserted into the inner cylindrical portion of the ignition device 90, the conical tip portion 95s of the sealing rubber member 95 is the rear portion of the protrusion 92a of the side core 92. Is located in.

Thus, when the ignition device 90 is inserted into the plug opening and the plug tube 93, the flipping of the sealing rubber member 95 is prevented. The protrusion 92a of the side core 92 serving as the inner cylindrical portion may be provided on the coil case portion 91.

On the other hand, in the sealing rubber member 95 of this embodiment of the ignition device 90 according to the present invention as shown in Fig. 22, when the ignition device 90 is inserted into the plug opening, The flange portion 95d forming the radially extending surface is in contact with the tip portion 94a of the cylinder head cover 94.

By the above state, a sealing structure having the sealing rubber member 95 of the ignition device 90 can be formed. Thus, penetration of water into the cylinder head cover 94 can be prevented.

That is, as described above, at the tip portion 94a in the plug opening, a scatter is generated about 1 mm in the axial direction.

However, when the flange portion 95d of the sealing rubber member 95 comes into contact with the tip portion 94a of the cylinder head cover 94 and is press-inserted, the flange portion 95d of the sealing rubber member 95 deforms, and Penetration can be prevented.

The extended surface formed on the flange portion 95d described above and extending in the radial direction indicates the extended surface extending in the radial direction of the inner cylindrical portion of the ignition device 90.

Even when the tip portion 94a of the cylinder head cover 94 is shifted by about 1 mm in the radial direction, the extended surface always contacts the displaced tip portion 94a of the cylinder head cover 94. Therefore, the ignition apparatus 90 which has the outstanding sealing property can be obtained.

The necessary range of the extended surface of the flange portion 95d of the sealing rubber member 95 can completely compensate for the positional shift of the plug opening, that is, the front end portion (outer cylindrical end portion) 94a of the cylinder head cover 94. This is a range in which the deviation in the radial direction can be prevented.

For example, the range is larger than the range having the entire dimension of the end dimension of the tip portion 94a of the cylinder head cover in addition to the maximum misaligned dimension.

On the other hand, the inclined cone portion 95a of the sealing rubber member 95 serves as a guide member when the inner cylindrical portion of the ignition device 90 is inserted into the plug opening and the plug tube 93. Thus, the alignment between the cylindrical portion of the ignition device 90 and the plug tube 93 is well established.

Therefore, the maximum misalignment dimension must be compensated between the plug opening formed by the cylinder head cover 94 and the sealing rubber member 95. Therefore, the extended surface of the sealing rubber member 95 can compensate for the position shift and can also serve as a sealing function.

The sealing structure of the ignition device according to the invention is illustrated by an ignition device in which the internal combustion engine has a plug tube in addition to the cylinder head and cylinder head cover of the internal combustion engine.

However, the above-described sealing structure according to the present invention may be used with an ignition device in which the internal combustion engine has a cylinder head and a cylinder head cover and does not have a plug tube.

1 is a cross-sectional view of one embodiment of an ignition device for an internal combustion engine according to the present invention;

2 is a horizontal sectional view of an ignition device for an internal combustion engine;

3A is a perspective view of an inner sheet of a side core of an ignition device for an internal combustion engine according to the present invention;

Fig. 3B is a perspective view of the outer sheet of the side core of the ignition device for an internal combustion engine according to the present invention.

Figure 4a is a side view of the primary bobbin structure provided with a groove or notch of the ignition device for an internal combustion engine according to the present invention.

4B is a plan view of the primary bobbin provided with the grooves of FIG. 4A.

Fig. 5 is a flowchart of the magnetic flux when the ignition device for the internal combustion engine according to the present invention is mounted on the internal combustion engine.

Fig. 6 is a diagram showing the relationship between the length of the side core and the secondary voltage of the ignition device for an internal combustion engine according to the present invention.

Fig. 7 is a sectional view of an ignition device for an internal combustion engine according to the present invention, wherein the cylinder head and cylinder head cover of the internal combustion engine are made of aluminum material.

Fig. 8 is a sectional view of the ignition device for an internal combustion engine according to the present invention, wherein the cylinder head of the internal combustion engine is made of aluminum material and the cylinder head cover is made of thermoplastic synthetic resin material.

Fig. 9 is a sectional view of the ignition device for an internal combustion engine according to the present invention, wherein the cylinder head of the internal combustion engine is made of aluminum material, the cylinder head cover is made of thermoplastic synthetic resin material, and the iron plug tube is inserted into the plug opening of the internal combustion engine.

Fig. 10A is a perspective view of an example of the positional relationship between the center core and the magnet of the ignition device for an internal combustion engine according to the present invention, wherein the magnet is located above the center core;

Fig. 10B is a perspective view of another example of the positional relationship between the center core and the magnet of the ignition device for an internal combustion engine according to the present invention, wherein the magnet is located below the center core;

Fig. 10C is a perspective view of another example of the positional relationship between the center core and two magnets of the ignition device for an internal combustion engine according to the present invention, in which two magnets are positioned above and below the center core;

Figure 11 is a sectional view of another embodiment of an ignition device for an internal combustion engine according to the present invention, wherein the installation position of the ignition device is located lower than the upper end of the center core.

12 is an explanatory diagram showing a heat flow generated in the ignition device for an internal combustion engine according to the present invention;

Fig. 13 is a circuit diagram of the igniter unit structure of the igniter case portion of the outer case of the ignition device for an internal combustion engine according to the present invention.

Fig. 14 is a graph showing a comparative example of secondary voltages of respective internal combustion engines having different thicknesses of the side cores of the ignition apparatus for the internal combustion engine according to the present invention.

Fig. 15 is a sectional view showing a state where an embodiment of an ignition device for an internal combustion engine according to the present invention is mounted on an internal combustion engine.

Figure 16 is a perspective view of one embodiment of an igniter case portion and a coil case portion of the ignition device for an internal combustion engine according to the present invention.

Figure 17 is a perspective view of one embodiment of an igniter case portion of the ignition device for an internal combustion engine according to the present invention.

Figure 18 is a perspective view of one embodiment of a coil case part of the ignition device for an internal combustion engine according to the present invention.

Fig. 19 is a sectional view showing a state in which the coil case part and the igniter case part are integrally coupled at the coupling part of the coil case part and the igniter case part of the embodiment of the ignition device for an internal combustion engine according to the present invention.

20 is a cross-sectional view showing a state in which the coil case part and the igniter case part are integrally coupled at the coupling part of the coil case part and the igniter case part of another embodiment of the ignition device for an internal combustion engine according to the present invention.

Fig. 21 is a cross-sectional view showing a state in which the coil case part and the igniter case part are integrally coupled at the coupling part of the coil case part and the igniter case part in still another embodiment of the ignition device for an internal combustion engine according to the present invention.

Fig. 22 is a sectional view of the sealing rubber member of the ignition device for an internal combustion engine according to the present invention.

Fig. 23 is a sectional view of a sealing structure using a sealing rubber member of the ignition device for an internal combustion engine according to the present invention.

<Explanation of symbols for main parts of drawing>

10: ignition device

11: primary bobbin

12: primary coil

13: secondary bobbin

14: secondary coil

15: outer case

17: center core

18: side core

20: magnet

25: sealing member

30: igniter unit

32: igniter terminal

Claims (24)

With a core core, The primary coil wound around the primary bobbin, The secondary coil wound around the secondary bobbin, With outer case, A side core arranged around an outer circumference of the outer case and made using a silicon steel sheet, The primary coil and the secondary coil are arranged between the central core and the outer case, The ignition device is housed in a plug opening formed by a cylinder head cover and a cylinder head of an internal combustion engine, The side core has two horizontally extending sidewall ends size slit, the slit preventing one turn short of the magnetic flux of the side core, whereby a predetermined secondary voltage higher than the engine required secondary voltage is obtained. . 2. The oriented core of claim 1, wherein the side core is a sheet of oriented silicon steel sheet having a slit between two horizontally extending sidewall ends, or a sheet of non-oriented silicon having a slit between two horizontally extending sidewall ends. Ignition device for an internal combustion engine comprising a steel sheet. The internal combustion engine of claim 1, wherein the side core comprises a laminate structure consisting of two or more oriented silicon steel plates each having a slit between two horizontally extending sidewall ends, the plurality of slits being aligned at the same position. Ignition device. 2. The sheet of claim 1, wherein the side core comprises at least one non-oriented silicon steel sheet having a slit between two horizontally extending sidewall ends and at least one oriented silicon steel sheet having a slit between two horizontally extending sidewall ends. And a slit of said one sheet of non-oriented silicon steel sheet and said slit of said at least one sheet of oriented silicon steel sheet being aligned at the same position. 2. The sheet of oriented silicon steel according to claim 1, wherein when both the cylinder head and the cylinder head cover are made of aluminum material, the side cores each have a sheet thickness of two or three sheets having a sheet thickness of 0.3 mm to 0.5 mm. Is formed to have a total plate thickness of 0.6 mm or more in a tubular round shape, and each oriented silicon steel sheet has slits between two horizontally extending side wall ends, and the plurality of slits are aligned in the same position. Device. 6. An ignition device for an internal combustion engine as set forth in claim 5, wherein an upper end of said side core is positioned equal to an upper end of said cylinder head cover or lower than an upper end of said center core. 2. The sheet core according to claim 1, wherein when the cylinder head is made of aluminum material and the cylinder head cover is made of thermoplastic synthetic resin material, the side cores each have two sheets having a plate thickness of 0.3 mm to 0.5 mm, or Three oriented silicon steel sheets are roundly stacked in a tubular shape to have a total plate thickness of 0.6 mm or more, and each oriented silicon steel sheet has slits between two horizontally extending side wall ends, and the plurality of slits are in the same position. Ignition device for internal combustion engines arranged on. 8. The ignition device according to claim 7, wherein the upper end of the side core is positioned equal to the upper end of the cylinder head cover or lower than the upper end of the center core. The sheet core according to claim 1, wherein when the iron plug tube is press-inserted into the plug opening of the internal combustion engine, the side core has a slit between two horizontally extending side wall ends and has a sheet thickness of 0.3 mm to 0.5 mm. A non-oriented steel sheet or an ignition device for an internal combustion engine, formed by roundly laminating a directional steel sheet having a slit between two horizontally extending side wall ends and having a sheet thickness of 0.3 mm to 0.5 mm in a tubular shape. 10. The ignition device according to claim 9, wherein the upper end of the side core is positioned equal to the upper end of the cylinder head cover or lower than the upper end of the center core. 6. The sheet of claim 5, wherein when the iron plug tube is press-inserted into the plug opening of the internal combustion engine, the side core has a slit between two horizontally extending side wall ends and has a sheet thickness of 0.3 mm to 0.5 mm. A non-oriented steel sheet or an ignition device for an internal combustion engine, formed by roundly laminating a directional steel sheet having a slit between two horizontally extending side wall ends and having a sheet thickness of 0.3 mm to 0.5 mm in a tubular shape. 12. The internal combustion engine according to claim 11, wherein an upper end of the side core is positioned equal to an upper end of a higher side of the upper end of the cylinder head cover or the upper end of the steel plug tube, and lower than an upper end of the center core. Ignition device. The ignition device for an internal combustion engine according to claim 1, wherein a magnet for generating a magnetic flux in a direction opposite to the magnetic flux formed by said primary coil is provided at either or both ends of said center core. With a core core, The primary coil wound around the primary bobbin, The secondary coil wound around the secondary bobbin, With outer case, A side core arranged around an outer circumference of the outer case, An accommodating body accommodating an igniter case portion having a connector disposed in close proximity and a coil case portion, The primary coil and the secondary coil are arranged between the center core and the outer case, The receiving body includes an independent and individual igniter receiving unit and an independent and individual coil receiving unit, The igniter housing and the coil housing is coupled to the ignition device for an internal combustion engine. With a core core, The primary coil wound around the primary bobbin, The secondary coil wound around the secondary bobbin, With outer case, A side core arranged around an outer circumference of the outer case, An accommodating body accommodating an igniter case portion and a coil case portion having an electrically arranged connector; A sealing member for blocking an environment inside and outside the plug opening of the internal combustion engine, The primary coil and the secondary coil are arranged between the center core and the outer case, The receiving body includes an independent and individual igniter receiving unit and an independent and individual coil receiving unit, The igniter accommodating part accommodates the igniter case part at a portion at which the sealing member is fitted. An ignition device for an internal combustion engine is coupled to the igniter housing and the coil housing. The said coil accommodating part is formed using the mixed material, The said mixed material is a compounding agent which has a material characteristic with strong adhesiveness with the resin material for insulation to insulate the said coil part, An ignition device for an internal combustion engine in which a base resin material having strong heat resistance and strong withstand voltage is mixed. The method of claim 16, wherein the base resin material is a polyphenylene sulfide resin material, And said compounding agent is a modified polyphenylene oxide resin material. The ignition device for an internal combustion engine according to claim 14 or 15, wherein the coil accommodating portion is formed using a polyphenylene sulfide resin material. The coupling part between the igniter accommodating portion and the coil accommodating portion has a contact surface perpendicular to the axial direction of the coil accommodating portion and another contact surface concentric with an axial center of the coil accommodating portion. Ignition device for internal combustion engine having. 16. The ignition device for internal combustion combustion as claimed in claim 14 or 15, wherein the coupling between the igniter accommodating portion and the coil accommodating portion is coupled in such a manner that the igniter accommodating portion is integrally formed with a prefabricated coil accommodating portion. With a core core, The primary coil wound around the primary bobbin, The secondary coil wound around the secondary bobbin, With outer case, A side core arranged around an outer circumference of the outer case, A spark plug arranged below the plug opening, The primary coil and the secondary coil are arranged between the center core and the outer case, The ignition device is housed in a plug opening and a plug tube formed by a cylinder head cover and a cylinder head of an internal combustion engine, and includes an inner cylindrical portion inserted into the plug opening, and an inlet of the ignition device to prevent water from penetrating into the plug opening. And a sealing rubber member inserted into and fixed to the inner cylindrical portion. The sealing rubber member includes a flange portion and a cone portion, The flange portion of the sealing rubber member has a radially extending surface, The extended surface is in contact with the tip portion of the cylinder head cover from the axial direction, can be bent in the axial direction and can prevent the radial deviation, And the cone portion of the sealing rubber member forms a taper in the direction of the spark plug to guide the sealing rubber member when the cone portion of the sealing rubber member is inserted into the plug tube. The ignition device for an internal combustion engine according to claim 21, wherein the flange portion of the sealing rubber member has a space portion, and the space portion of the sealing rubber member can prevent axial bending and deformation expansion in the flange portion of the sealing rubber member. . The method of claim 21, The inner cylinder of the ignition device has one or more protrusions, The protruding portion of the sealing rubber member is formed closer to the spark plug side than the conical tip side of the conical portion of the sealing rubber member, The protruding portion of the sealing rubber member has an outer diameter larger than the outer diameter of the conical tip portion of the conical portion of the sealing rubber member. The method of claim 21, The cylindrical portion has an outer diameter (D), The sealing rubber member has a conical tip portion having an inner diameter D1, an inner cylindrical portion having an inner diameter D2, and a step portion for forming respective inner dimension sizes having a relationship of D1 &lt; D &lt; D2. Ignition device for an internal combustion engine further comprising.

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