JP4332571B2 - Ignition device for internal combustion engine - Google Patents

Description

The present invention relates to an ignition device for an internal combustion engine, and in particular, a circle housed in a plug hole portion of an engine.
The present invention relates to a sealing device inside and outside a plug hole of a cylindrical ignition device.

In a conventional ignition device for an internal combustion engine, a coil portion is mounted in a cylindrical case housed in a plug hole as disclosed in JP-A-2-228011.

JP-A-2-22811

In this prior art, there is no description about the seal inside and outside the plug hole.

An object of the present invention is to prevent the intrusion of water into a plug hole in connection with a member that forms a plug hole by attaching a seal rubber to the outer periphery of a coil case portion housed in the plug hole. Is.

The above-mentioned object has a configuration in which the seal rubber has an inner cylindrical portion that is attached to the cylindrical coil case portion, a flange portion that extends in the radial direction, and an outer cylindrical portion that is formed on the outer peripheral portion of the surface. This is achieved by forming a large diameter portion in contact with the inner diameter portion of the plug hole on the outer periphery of the end portion of the cylindrical portion on the spark plug side.

  According to the present invention, it is possible to prevent water from entering the plug hole.

An embodiment of an ignition device for an internal combustion engine according to the present invention will be described below 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 of the ignition device for an internal combustion engine.

An internal combustion engine ignition device (ignition coil) 10 mainly includes a primary bobbin 11, a primary coil 12, a secondary bobbin 13, a secondary coil 14, an exterior case 15, an epoxy resin member 16, a center core (open magnetic circuit core) 17, A side core (exterior iron core) 18 and a flexible epoxy resin member 19 are included.

  The internal combustion engine ignition device (ignition coil) 10 includes a magnet 20, a high-voltage terminal 21, a spring 22, a rubber boot member 23, a high-pressure diode 24 for preventing premature ignition, a seal rubber member 25, and an igniter. The unit 30 is configured.

  The igniter unit 30 has a metal base 36 made of copper or aluminum press-molded in a box shape, and the metal base 36 has a power transistor chip 31 and a hybrid IC circuit 36. The igniter terminal 32 is fixed to a terminal block 37 formed integrally with the metal base 36 through an 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 disposed at the center of the ignition device 10, and the center core 17 is configured by press laminating directional silicon steel plates. The primary bobbin 11 is fitted on the outer periphery of the center core 17, and a secondary coil 12 such as an enamel wire is wound around the primary bobbin 11. The secondary bobbin 13 is disposed outside the primary bobbin 11. The divided secondary coil 14 is wound around the secondary coil 13 at a predetermined interval. The outer case 15 is wound around the outer periphery of the secondary bobbin 13.

  The exterior case 15 includes an igniter case portion 15a and a coil case portion 15b, and the coil case portion 15b has a protruding portion 15b1 extending perpendicularly to the outside. The side core 18 is disposed outside the coil case portion 15 b of the outer case 15.

3A is a perspective view of the inner side core of the internal combustion engine ignition device of the present invention, and FIG.
FIG. 3 is a perspective view of an outer side core of the ignition device for an internal combustion engine of the present invention.

  The side core 18 has a laminated structure of two silicon steel plates 18a and 18b, an inner silicon steel plate (inner side core) 18a and an outer silicon steel plate (outer side core) 18b. The two silicon steel plates 18a and 18b are each made of a single directional silicon steel plate. The inner silicon steel plate 18a of the side core 18 is made of one directional silicon steel plate having a thickness of 0.35 mm. The inner silicon steel plate 18a has a slit 18a1 extending vertically, and is formed by being rolled into a substantially tubular shape. The inner silicon steel plate 18 a is fitted to the outer periphery of the outer case 15, and the slit 18 a 1 of the inner silicon steel plate 18 a is positioned at the protruding portion 15 b 1 of the coil case portion 15 b of the outer case 15. Note that the protrusion 15b1 of the coil case 15b is not necessarily provided on the exterior case 15.

  The outer silicon steel plate 18b of the side core 18 is made of one directional silicon steel plate having a thickness of 0.35 mm. The outer silicon steel plate 18b has a slit 18b1 extending vertically and is formed in a substantially tubular shape. The outer silicon steel plate 18b is laminated and stacked on the outer periphery of the inner silicon steel plate 18a. Therefore, the laminated structure of the side core 18 is composed of the inner silicon steel plate 18a and the outer silicon steel plate 18b, and has a total thickness of 0.7 mm. The slit 18b1 of the outer silicon steel plate 18b is positioned between the protrusions 15b1 of the coil case portion 15b of the exterior case 15.

  In the ignition device 10 of the above-described embodiment of the present invention, the laminated structure of the side core 18 composed of the inner silicon steel plate 18a and the outer silicon steel plate 18b is between the vertical side wall ends of the inner silicon steel plate 18a having the slit 18a1. A gap (space) g is formed between the end of the vertical side wall of the outer silicon steel plate 18b having a slit 18b1.

  The slit 18a1 of the inner silicon steel plate 18a and the slit 18b1 of the outer silicon steel plate 18b forming the gap g are electrically insulated and separated by the protrusion 15b1 of the coil case portion 15b. The side core 18 having the slit 18a1 and the slit 18a1 prevents a short turn of the magnetic flux.

  Regarding the directional silicon steel plate and the non-oriented silicon steel plate used as the side core 18 of the ignition device 10, there are generally four types of thicknesses of silicon steel plates sold on the market, and these are 0. There are 23mm, 0.3mm, 0.35mm and 0.5mm plate thickness types. In particular, in the present invention, as the side core 18, as an example, a silicon steel plate used as a single sheet can be suitably used with a thickness of 0.5 mm. As a laminated structure of silicon steel sheets used as two or three sheets, A plate having a thickness of 0.35 mm (total thickness of 0.7 mm or 1.05 mm) can be preferably used.

  The primary bobbin 11 is made by molding with a thermoplastic synthetic resin (for example, modified polyphenylene oxide (hereinafter referred to as “modified PPO”)). A primary coil 12 is wound around the primary bobbin 11.

  The primary bobbin 11 is bonded to the epoxy resin member 16 in order to prevent the electric field concentration from occurring due to peeling of the epoxy resin member 16 for insulating the high voltage from the primary bobbin 11 after the thermal shock test, thereby causing dielectric breakdown. Molding with modified PPO considering the properties. Considering that the internal combustion engine ignition device 10 of the present invention is mounted in the plug hole portion of the engine, it is better to use a material having a heat deformation temperature of the modified PPO as the primary bobbin 11 of 150 ° C. or higher.

  4A is a perspective view of a primary bobbin having a groove (notch) of the ignition device for an internal combustion engine of the present invention, and FIG. 4B is a plan view of the primary bobbin having the groove of FIG. It is.

  As shown in FIGS. 4A and 4B, the primary bobbin 11 has a depth of 0.1 to 0.5 mm so that the winding portion of the primary coil 12 is easily impregnated with the epoxy resin member 16 for high voltage insulation. Grooves (notches) 11a and 11b are provided. The primary coil 12 is formed by laminating and winding an enameled wire of about 0.3 to 1.0 mm several tens of times per layer, a total of about 100 to 300 times over several layers. A secondary coil 14 is wound around a secondary bobbin 13 formed by molding with a thermoplastic synthetic resin (for example, modified PPO). The secondary bobbin 13 is disposed between the center core 17 and the secondary coil 14 and also serves to insulate the high voltage generated in the secondary coil 14.

  Here, since the center core 17 is floating from the ground (GND), it becomes an intermediate potential of the voltage generated in the secondary coil 14. In order to insulate the potential difference between the center core 17 and the secondary coil 14, the thickness of the secondary bobbin 13 is set to 0.5 to 1.2 mm, and further, electric field concentration between the secondary coil 14 and the center core 17 is prevented. Next, the flexible epoxy resin member 19 is vacuum-injected inside the secondary bobbin 13. The secondary coil 14 is divided and wound a total of about 10,000 to 30,000 times using an enameled wire having a wire diameter of about 0.03 to 0.06 mm.

  The outer case 15 is made of a thermoplastic synthetic resin (for example, polybutylene terephthalate (hereinafter referred to as “PBT”), polyphenylene sulfide (hereinafter referred to as “PPS”), etc. The outer case 15 is formed on the high-pressure side. The center core 17 is formed by press laminating silicon steel plates having a thickness of 0.2 to 0.7 mm.

  The side core 18 and the magnet 20 disposed below the center core 17 are arranged so that the effective magnetic flux φx of the center core portion can be best utilized when the ignition device 10 is mounted in the plug hole portion of the engine. 14 and the side core 18 are arranged so that the stray capacitance C generated between them can be reduced reasonably.

  FIG. 5 is a diagram showing the flow of magnetic flux when the internal combustion engine ignition device of the present invention is mounted on an engine.

As shown in FIG. 5, when the ignition device 10 is mounted on the plug hole portion of the engine, the effective magnetic flux φx of the center core 17 portion is the magnetic flux φ ₁ of the side core portion 18 and the magnetic flux φ ₀ of the plug hole portion 43 of the engine. Divided into The relationship between the thickness of the side core 18 and the secondary voltage of the engine when the one-turn short cylinder head cover is made of aluminum is shown by the magnetic flux φ ₀ of the engine plug hole 43 as follows.

φx ≒ φ ₁ + φ ₀
V2≈Nxdφx / dt
V2′≈Nxd (dφx + φ ₀ ) / dt
Here, V2 is a secondary voltage in the case of a single ignition device, and V2 ′ is a secondary voltage of the ignition device when mounted on the engine.

  According to the ignition device 10 of the above embodiment of the present invention, the side core 18 is formed by stacking two directional silicon steel plates having slits with a plate thickness of 0.35 mm so as to have a total plate thickness of 0.7 mm. It is possible to obtain a predetermined secondary voltage that is higher than the required engine secondary voltage and thus clear the required engine secondary voltage.

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

  As shown in FIG. 6, for example, the upper end of the side core is preferably positioned higher than the upper end of the cylinder head of the engine in which the plug hole is formed. Specifically, the upper end of the side core is positioned higher than the upper end of the cylinder head of the engine, or the upper end of the side core is positioned 10 mm higher than the upper end of the cylinder head of the engine. With the above configuration, since the secondary voltage (V1) of the ignition device 10 is higher than the engine required secondary voltage (V2) required by the engine, the ignition device 10 can reliably ignite the engine.

  FIG. 7 is a cross-sectional view of the ignition device for an internal combustion engine of the present invention when both the cylinder head and the cylinder head cover of the engine are made of aluminum.

  As shown in FIG. 7, the aluminum cylinder head 41 a and the aluminum cylinder head cover 42 a form a plug hole portion 43 a that houses the ignition device 10. The spark plug 44 a is disposed at the lower part 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, 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, the secondary voltage of the ignition device 10 decreases. At least one place on the circumference of the side core 18 is provided with a notch (cut, slit 18a or 18b) for preventing one-turn short circuit.

  When the cylinder head 41a and the cylinder head cover 42a are both made of aluminum, the side core 18 is formed by rolling a silicon steel plate having a thickness of 0.3 to 0.5 mm into a tubular shape and stacking two or more sheets to a thickness of 0.6 mm or more. The upper end 18c of the cylinder 18 is set to the same extent as the upper end 42a1 of the cylinder head cover 42a or below the upper end 17a of the center core 17.

  FIG. 8 is a cross-sectional view of the ignition device for an internal combustion engine of the present invention when the cylinder head of the engine is made of aluminum and the cylinder head cover is made of a thermosetting resin.

  As shown in FIG. 8, the cylinder head 41 b made of aluminum and the cylinder head cover 42 b made of thermosetting resin form a plug hole portion 43 b that houses the ignition device 10. The spark plug 44b is disposed in the lower part of the ignition device 10.

  When the cylinder head 41b is made of aluminum and the cylinder head cover 42b is made of a thermoplastic synthetic resin (for example, polypropylene, nylon 6, nylon 66, nylon 12, etc.), the side core 18 is made of a silicon steel plate having a thickness of 0.3 to 0.5 mm. Two to three sheets are rolled up into a tubular shape with a thickness of 0.6 mm or more, and the upper end 18c of the side core 18 is set to the same extent as the upper end 41b1 of the cylinder head 41b or below the upper end 17a of the center core 17.

  When the cylinder head and cylinder head cover are both made of aluminum and an iron plug tube is press-fitted into the plug hole of the engine, the side core is rolled by rolling a silicon steel plate having a thickness of 0.3 to 0.5 mm into a tubular shape. The stack thickness is 0.6 mm or more, and the upper end of the side core is the same as the upper end of the cylinder head cover or below the upper end of the center core.

  FIG. 9 is a cross-sectional view of the internal combustion engine ignition device according to the present invention in which the cylinder head of the engine is made of aluminum, the cylinder head cover is made of thermosetting resin, and the iron plug tube is housed in the plug hole portion of the engine. FIG.

  As shown in FIG. 9, the cylinder head 41 c made of aluminum and the cylinder head cover 42 c made of thermosetting resin form a plug hole portion 43 c that houses the ignition device 10. The spark plug 44 c is disposed at the lower part of the ignition device 10.

  The cylinder head 41c is made of aluminum and the cylinder head cover 42c is made of a thermoplastic synthetic resin (for example, polypropylene, nylon 6, nylon 66, nylon 12, etc.), and an iron plug tube 45 is press-fitted into the plug hole 43c of the engine. When the side core 18 is formed, a silicon steel plate having a thickness of 0.3 to 0.5 mm is rolled into a tubular shape so that the thickness of one or two sheets is 0.6 mm or more, and the upper end 18c of the side core 18 is connected to the upper end 41c1 of the cylinder head 41c. The upper end 45a of the iron plug tube 45 is approximately the same as the higher upper end, or is lower than the upper end 17a of the center core 17.

FIG. 10 (a) is a diagram showing the positional relationship between the center core and the magnet of the ignition device for an internal combustion engine of the present invention in which the magnet is located above the center core, and FIG. 10 (b) is the present invention in which the magnet is located below the center core. FIG. 4C is a diagram showing the positional relationship between the center core and the magnet of the internal combustion engine ignition device of FIG. 1, and FIG. 8C is a diagram showing the positional relationship between the center core and the magnet of the ignition device for the internal combustion engine of the present invention in which two magnets are located at the upper and lower portions of the center core. It is.

  As shown in FIGS. 10A, 10 </ b> B, and 10 </ b> C, a magnet that generates a magnetic flux in the opposite direction to the magnetic flux formed by the primary coil 12 in one end of the center core 17 or both ends of the center core 17 in the magnetic path. 20 (20a, 20b, 20c0, 20d).

  When both the cylinder head 41a and the cylinder head cover 42a are made of aluminum, the magnet 20 can generate magnetic flux more efficiently if the magnets (20c, 20d) are attached to both ends of the center core 17.

When the cylinder head 41b or 41c is made of aluminum and the cylinder head cover 42b or 42c is made of a thermoplastic synthetic resin, a magnetic flux can be efficiently generated simply by attaching the magnet 20 (20a or 20b) to one end of the center core 17. it can. In this case, the magnet 20 (20a or 20b) generates magnetic flux more efficiently when mounted on the aluminum cylinder heads 41b and 41c than when mounted on the thermoplastic synthetic resin cylinder head covers 42b and 42c of the center core 17. be able to.

FIG. 11 is a cross-sectional view showing another embodiment of the ignition device for an internal combustion engine of the present invention when the mounting position of the ignition device is positioned lower than the upper end of the center core.

In the conventional ignition device, the mounting position of the coil could not be lowered from the upper end of the center core. However, in the present invention, the mounting position 46 of the ignition device 10 can be lowered from the upper end 17a of the center core 17 as shown in FIG. Therefore, it can be attached to an engine having a short distance from the ignition plug 44 (44a, 44b, 44c) to the attachment position 46 of the ignition device 10.

  The components of the ignition device 10 of the present invention are arranged concentrically in the order of the center core 17, the secondary coil 14, the primary coil 12, the outer case 15, and the side core 18 from the inside. These coil portions are inserted into the outer case 15 to insulate the high voltage with an insulating layer such as an epoxy resin member 16.

The epoxy resin member 16 has a glass transition point after curing of 120 to 162 ° C. in order to improve thermal shock resistance (such as a repeated test at −40 ° C. and 130 ° C.) and high voltage resistance at high temperatures. A thermal expansion coefficient having an average value of 10 to 50 × 10 ⁻⁶ in the temperature range below the glass transition point is used. In the cylindrical ignition device 10 accommodated in the plug hole portion 43, the biggest problem is how to release the heat generated by the primary coil 11 to the air outside the plug hole portion 43.

  FIG. 12 is an explanatory view showing the flow of heat generated by the internal combustion engine ignition device of the present invention.

  Heat generated in the primary coil 12 and the secondary coil 14 (usually, the heat generation of the secondary coil 14 is less than half of the heat generation of the primary coil 12, and the total power loss of the primary coil 12 and the secondary coil 14 is about 4 W or less. 12), there is a heat flow A that escapes from the epoxy resin member 16 through the center core 17 into the air and a heat flow B that escapes from the epoxy resin member 16 through the side core 18 into the air.

  For this reason, when the relationship between the heat (power loss), the temperature rise of the primary coil 12 and the ambient temperature outside the plug hole portion 43 is expressed by thermal resistance, it is about 15 ° C./W (the upper portion of the plug hole portion 43 is caused by wind. In the case of cooling, a structure using an epoxy resin member 16 having good thermal conductivity such as approximately 5 ° C./W to 10 ° C./W is employed. The high voltage generated in the secondary coil 14 is supplied to the spark plug 44 through the high voltage terminal 21, the spring 22 and the like. The portion where the spark plug 44 is inserted is insulated by a rubber boot member 23 such as silicon rubber.

FIG. 13 is a circuit diagram of an igniter case unit of the outer case of the ignition device for the internal combustion engine of the present invention.

As shown in FIG. 13, the one-chip igniter 50 installed on the upper portion of the coil section is composed of an insulated gate bipolar transistor (hereinafter referred to as “IGBT”) 51, a current limiting circuit 52, and an input resistor 53. The IGBT 51 is composed of a main IGBT 54 and a sub IGBT 55. The current detection load 56 is provided between the emitter of the sub IGBT 55 and the ground (GND).

A bidirectional polysilicon Zener diode 57 made of polysilicon having excellent temperature characteristics is inserted between the gate and collector of the IGBT 51, and the primary voltage is clamped at 350 to 450V. A bleeder resistor 58 is inserted between the input and ground (GND), the contact current of the input signal connection portion is set to 1 mA or more, and sufficient connection reliability can be obtained even if the terminal plating is tin plating. .

In the one-chip igniter 50, a heat-dissipating copper or aluminum metal plate is bonded to the lower part of the heat sink on the side to which the IGBT 51 is bonded with a silicon adhesive, and the IGBT 51 and the terminal are connected with an aluminum wire and made of epoxy resin. Molded TO-3P or TO-220 type.

  Hereinafter, another embodiment of the present invention will be described with reference to the drawings.

FIG. 14 is a sectional view showing the configuration of an internal combustion engine ignition device according to an embodiment of the present invention. In the figure, a primary coil 102 is wound around a primary bobbin 101. A secondary coil 104 is wound around the secondary bobbin 103. The primary coil 102 is obtained by laminating enameled wires. The secondary coil 104 is divided and wound.

  The coil case 105 b is disposed outside the secondary coil 104. The center core 107 is disposed inside the primary bobbin 101, and is formed by press laminating silicon steel plates. The side core 108 is disposed outside the coil case 105b that houses the secondary coil 104, and is formed by rolling a thin silicon steel plate into a tubular shape. In order to prevent a short turn of the magnetic flux, at least one place on the circumference of the side core 108 is provided with a cut 108a. In order to magnetically couple the center core 107 and the side core 108 to form a closed magnetic circuit, the low voltage side core 1018 is disposed on the low voltage side of the secondary coil 104, and the high voltage side core 109 is disposed on the high voltage side of the secondary coil 104.

  The upper portion of the low-pressure side core 1018 is covered with an elastic member 1012 such as flexible epoxy resin or rubber. As a result, the insulating epoxy resin 106 as an insulating resin for insulating the secondary coil 104, the center core 107, and the low-voltage side core 1018 can be isolated. The high-pressure core 109 is accommodated in a pocket portion 103 a provided in the secondary bobbin 103 and is isolated by an insulating epoxy resin 106. A part of the closed magnetic circuit core has a core gap, and the core gap includes a magnet 1010 that generates a magnetic flux in a direction opposite to the magnetic flux formed by the primary coil 102 in the magnetic path. The coil part is comprised from the above components.

The coil portion is press-fitted and accommodated in a coil case 105b integrally formed of a synthetic resin having heat resistance and voltage resistance such as polyphenylene sulfide resin (hereinafter, abbreviated as PPS or PPS resin). The insulating epoxy resin 106 is filled and insulated from a high voltage and fixed. In order to shorten the overall length of the ignition device as much as possible, the high voltage generated in the secondary coil 104 has a high voltage diode 1017, a high voltage terminal 1013, and a spring 1014 for preventing premature ignition arranged in a direction perpendicular to the longitudinal direction. Is supplied to a spark plug, which will be described later. The portion where the spark plug is inserted is a rubber boot 1015 such as silicon rubber.
Insulate with. An annular seal rubber 1016 for preventing water from entering the plug hole from the outside of the plug hole is provided at a portion in contact with the cylinder head cover, that is, a portion corresponding to the vicinity of the upper surface of the plug hole of the internal combustion engine. The coil case 105b as a storage body is fitted and inserted. Therefore, it can be said that the seal rubber 1016 as the seal body isolates the environment inside and outside the plug hole.

On the other hand, the igniter unit arranged close to the upper part of the coil unit is an igniter unit 1020.
And a power transistor chip 1021. In other words, the igniter unit 1020 has a power transistor chip 1021 and a hybrid IC circuit 1028 built in a copper or aluminum metal base 1026 press-molded into a box shape, and a silicon gel 1029 is incorporated in the metal base 1026. Is filled. The metal base 1026 is fixed to a terminal block 1027 that integrally supports the igniter-side terminal 1022 with a thermoplastic synthetic resin or the like with a silicon adhesive.

The igniter case 105a that accommodates the igniter portion is integrally formed of a thermoplastic synthetic resin such as polybutylene terephthalate resin (hereinafter abbreviated as PBT or PBT resin) that also serves as the connector 1024. The igniter case 105a is filled with an insulating epoxy resin 106, and the igniter unit 1020 and the like are insulated and fixed. Also,
The coil part, the igniter part, and the connector side terminal 1025 of the connector 1024 are electrically connected by welding the igniter side terminal 1022 to the primary coil terminal 1023 and the connector side terminal 1025.

  Next, a detailed configuration of the internal heat engine ignition device will be described with reference to FIG.

  FIG. 15 is a development view of main components in the embodiment of FIG.

The center core 107 is pressed and laminated integrally with the low-pressure side core 1018. Center core 107 to which magnet 1010 is attached and low-pressure side core 1018
The T-shaped core made of is accommodated inside the primary bobbin 1. The primary bobbin 101 including the T-shaped core is press-fitted into the secondary bobbin 103 via the press-fitting portion 101c. The secondary bobbin 103 has a pocket portion 103a for accommodating the high-pressure side core 109 inserted from the radial direction. After the high-pressure side core 109 is enclosed in the pocket portion 103a, the secondary bobbin 103 is press-fit into the coil case 105b via the press-fit portion 103c. Fixed.

The coil portion is formed by the fitting structure of the primary bobbin 101 and the secondary bobbin 103, the secondary bobbin 103 and the coil case 105b, the pocket insertion structure of the high-pressure side core 109, and the filling structure of the insulating epoxy resin 106. Fixed. A cylindrical side core 108 that is disposed outside the coil case 105b to form an outer closed magnetic path has a cut 108a that extends in the axial direction and can be expanded in the circumferential direction. It can be easily inserted into.

FIG. 16 is a sectional view showing a state in which the embodiment of FIG. 14 is mounted on an internal combustion engine. A cylindrical internal combustion engine ignition device according to an embodiment of the present invention is mounted on an internal combustion engine as shown in FIG. 1039 is a cylinder head cover of the internal combustion engine, and 1030 is a cylinder head.

The spark plug 1032 is fixed so as to protrude into the combustion chamber of the cylinder head 1030. The internal combustion engine ignition device is fixed to the cylinder head cover 1039 with a mounting bolt 1031 through a mounting portion 105h provided in the igniter case 105a. The coil case 105b of the internal combustion engine ignition device is inserted into the plug hole 1040 formed in the cylinder head 1030 and the cylinder head cover 1039, which is susceptible to heat energy generated in the combustion chamber, and thus has a high heat resistance of about 150 ° C. It is what is required.

  And the plug hole 1040 (hole diameter and depth) into which the coil case 105b is inserted is standardized by a predetermined rule with respect to a predetermined type of internal combustion engine.

  Next, an igniter case 105a and a coil case 105b as exterior cases will be described with reference to FIGS.

FIG. 17 is a bird's-eye view of an igniter case according to an embodiment of the present invention. FIG. 18 is a bird's-eye view of a coil case according to an embodiment of the present invention.

In FIG. 17, an igniter case 105a that also serves as a connector 1024 is formed of PBT resin from the viewpoint of ensuring impact strength and dimensional accuracy required for the connector 1024. In particular, the connector 1024 that is also used as the igniter case 105a takes various forms in order to correspond to a mating connector having different specifications, and various igniter cases 105a are manufactured. And since the connector 1024 fitted to the mating connector has a complicated shape, it is slide-molded. Therefore, the igniter case 105a that also serves as the connector 1024 is required to have a material characteristic of good moldability.

Thus, it can be said that it is difficult to standardize the igniter case 105a having the connector 1024 corresponding to the mating connector having different specifications, in a structure in which the igniter case 105a is integrally formed as in the case of the prior art.

Therefore, as shown in FIGS. 17 and 18, the exterior case is divided into two parts, an igniter case 105a and a coil case 105b. Then, a coupling portion (that is, a fitting portion) with the coil case 105b to be integrated with the igniter case 105a is provided, and a stepped portion 105c for preventing removal and a protrusion for positioning and preventing rotation are provided at the coupling portion. A portion 105e is provided. Further, a portion in which an igniter unit 1020 as an igniter portion is accommodated is formed in a cup (inner box) shape.

On the other hand, in FIG. 18, the coil case 105b inserted into the standardized plug hole 1040 as described above is formed of PPS resin from the viewpoint of heat resistance. Alternatively, it is formed of a mixed resin in which, for example, about 20 (%) is blended with a PPS resin as will be described later using a modified polyphenylene oxide resin (hereinafter abbreviated as modified PPO or modified PPO resin) as a compounding agent.

  As shown in the figure, the coil case 105b is provided with a coupling portion (that is, a fitting portion) with the igniter case 105a for integration, and the coupling portion is provided with a stepped portion 105d for preventing removal and a rotation stopper. The prevention / positioning notch 105f is formed at the same time. Here, in order to make use of the standardization of the plug hole 1040, the outer dimensions of the coil case 105b (for example, the diameter φD of the stepped portion 105d, the diameter φd of the case main body, the total length L, corresponding to the dimensions of the prescribed plug hole 1040) Etc.) and the coil case 105b is shared.

Further, the diameter φD of the stepped portion 105c shown in FIG. 17 fitted to the diameter φD of the stepped portion 105d.
Have the same dimensions. In particular, the diameter φD of the stepped portion 105c is the same for each igniter case 105a manufactured in a different shape so as to correspond to the mating connector of different specifications, and the plug hole 1040 Unified to take advantage of standardization.

FIG. 19 is a cross-sectional view showing a state in which the coil case and the igniter case according to one embodiment of the present invention are joined together in a joint portion.

The igniter case 105a and the coil case 105b are divided into two parts so as to be able to cope with differences in environmental conditions to be mounted and various required connector specifications. Must be.

Accordingly, the stepped portion 105c of the igniter case 105a and the stepped portion 105d of the coil case 105b, which correspond to the two parts, are coupled together. In other words, both are fitted and integrally coupled at a coupling portion (that is, a fitting portion) corresponding to a portion corresponding to the vicinity of the upper surface of the plug hole of the internal combustion engine to be inserted.

Specifically, in the case of the embodiment of FIG. 19, an adhesive 1033 is applied to the V-shaped groove 105g provided in the joint portion, and the joint portion is joined by bonding, that is, joined. At this time, the protrusion 105e and the notch 105f mesh with each other to fix the rotation direction.

As described above, the outer case according to the present embodiment has standardized outer dimensions corresponding to the igniter case 105a formed in various shapes and corresponding to the standardized plug hole 1040 in order to correspond to mating connectors of different specifications. Coil case 105b having (diameter and total length)
The igniter case 105a and the coil case 105b are integrally coupled at the two parts.

  Furthermore, the coupling surface (that is, the mating surface) of both stepped portions 105c and 105d is the axial direction of the coil case 105b (that is, the hole axis direction of the plug hole 1040) and the connection direction of the connector 1024 (the hole axis of the plug hole). (Perpendicular to the direction) and the “dimensional accuracy” of the distance between the axis of the coil case 105b and the center of the mounting portion 105h provided in the igniter case 105a. In other words, the joint between the two stepped portions 105c and 105d has a contact surface perpendicular to the longitudinal axial direction of the coil case 105b (that is, the hole axial direction of the plug hole 1040), and the coil case 105b. And a contact surface that is concentric with each other, and is fitted and firmly joined so that there is no backlash at the joint.

Table 1 summarizes the materials used for the coil case and the materials used for the igniter case that also serves as a connector from the required characteristics. For materials that can be used as coil cases or connectors, for each characteristic item required for use, the evaluation is indicated by double circles, ○, △ in the order in which superior material properties are presented and in the order of requirements. Shows the results.

  That is, the required characteristics of the coil case that accommodates the coil portion and is inserted into the plug hole are mainly heat resistance and voltage resistance. The required characteristics of the igniter case, which is located outside the plug hole and accommodates the igniter portion but whose function as a connector is regarded as important, are mainly impact strength and chemical resistance.

  Thus, the required characteristics differ with respect to the materials of the igniter case 105a and the coil case 105b as the exterior case. Therefore, it can be understood from this table that the coil case and the connector (that is, the igniter case) are desirably divided into two and joined together.

For example, PBT resin is a material that satisfies the required characteristics as a connector.
Moreover, it can be said that as a material satisfying the required characteristics as the coil case, there is a PPS resin or a mixed resin of PPS and modified PPO.

  Here, in using the PPS resin, it is necessary to consider adhesion (or adhesiveness). That is, the adhesion between the insulating epoxy resin 106 to be filled and the coil case 105b is poor, and if it is peeled off, it becomes a defect and may cause an ignition error.

  Therefore, in order to ensure the long-term insulation of the coil, it is necessary to maintain the adhesion between them for a long time. Specifically, it is desired that thermal stresses of −40 ° C. and 130 ° C., which are equivalent to the temperature environmental conditions of the internal combustion engine, are alternately applied repeatedly so that peeling does not occur for 300 cycles or more. And when PPS resin was used independently as a material of the coil case 105b, it turned out that it may peel in less than 300 cycles depending on use conditions.

  On the other hand, the modified PPO is generally used as a material for the secondary coil 104 of the ignition device because it has good adhesion to the insulating epoxy resin 106. However, because of its poor chemical resistance, it is not suitable for use in places exposed to the outside air.

  By the way, as described above, the seal rubber 1016 as a seal body inserted into a portion corresponding to the vicinity of the upper surface of the plug hole of the internal combustion engine is used to isolate the environment inside and outside the plug hole. It can be seen that the coil case 105b plays an important role in that it is not exposed to the outside air. Therefore, there is a possibility that the modified PPO can be used for the coil case 105b.

  Therefore, for the coil case 105b, a mixed material of a PPS resin excellent in heat resistance, chemical resistance and voltage resistance and a modified PPO excellent in adhesion between the insulating epoxy resin 106 to be filled and sealed, such as a PPS group. About 20 (%) of modified PPO is mixed with the material, and it is a mixed material that takes advantage of each characteristic.

  That is, in the coil case 105b, a base material resin having excellent heat resistance and voltage resistance is mixed with a compounding agent having material characteristics excellent in adhesion to the insulating resin for insulating the coil portion. It can be said that it is desirable to be formed from a mixed material that takes advantage of the excellent material properties of the resin.

  In other words, it is possible to effectively use the function of the seal rubber 1016 to isolate the inside and outside environment of the plug hole. That is, an ignition device for an internal combustion engine according to the present invention includes an igniter portion and a coil portion having connectors that are electrically connected and arranged close to each other, a housing body that houses the igniter portion and the coil portion, and a fitting body that fits into the housing body. And a seal body that isolates the environment inside and outside the plug hole of the internal combustion engine into which the storage body is inserted, and the storage body is a coil at a portion (including the vicinity) where the seal body is inserted. The coil storage part is divided into two parts, the coil storage part that is inserted into the plug hole and the igniter storage part that contains the igniter part and is connected to the mating connector of different specifications outside the plug hole. It can be said that the portion and the igniter storage portion are integrally coupled at a portion divided into two.

By the way, if the required environmental specifications have an allowable range, the coil case 105b and the igniter case 105a can be made of the same material. In this case, since the two parts are separately formed, the molding conditions such as the mold splitting direction, injection gate position, push pin position, etc. can be appropriately set according to each shape. It is possible to make full use of the advantages that the above-described case having few defects and excellent in “squareness” and “dimensional accuracy” can be manufactured. This advantage widens the range of use. For this example, it can be said that a PPS resin having a better balance of heat resistance, chemical resistance and voltage resistance than other resins is desirable.

Summarizing the above, the feature of the present embodiment is that the housing as an exterior case is mainly used as a coil housing portion that is inserted into a plug hole of an internal combustion engine in which a coil portion is housed and a hole diameter and the like are standardized. The coil case 105b and the igniter case 105a as an igniter storage part that mainly has an igniter part and has a connector that mates with a mating connector of different specifications outside the plug hole are divided into two parts. The coil case 105b and the igniter It can be said that the case 105a is integrally coupled by bonding or the like at the two divided portions.

In other words, the storage body includes a coil storage portion inserted into the plug hole and a plug, with the internal and external positions of the plug hole of the internal combustion engine having different specifications for the environment determined from the environment in which the storage body is disposed, It can be said that the igniter storage part located outside the hole is divided into two parts and the two parts are combined.

In addition, the coil case that houses the coil body and the igniter case that also serves as a connector and houses the igniter are separated, and the coil case is made of a synthetic resin excellent in heat resistance, voltage resistance, adhesion to the coil insulating resin, etc. It can be said that

FIG. 20 is a cross-sectional view showing a state where the coil case and the igniter case according to another embodiment of the present invention are joined together at the joint portion. As shown in FIG. 20, the coil case 105 b has a configuration in which a stepped portion 105 d of the coil case 105 b is expanded and extended along the bottom of the igniter case 105 a (extension portion). By having an extension part,
The above-mentioned “perpendicularity” and “dimensional accuracy” can be improved, and the contact surface becomes large, so that the stability of fitting at the coupling portion can be obtained. Further, since the extended portion of the coil case 105b having excellent heat resistance covers the igniter case 105a, the heat resistance of the bottom portion of the igniter case 105a facing the cylinder head cover 1039 of the internal combustion engine can be improved.

  That is, even if the igniter case 205a using a synthetic resin having a slightly inferior heat resistance is used, it is possible to cope with severe heat-resistant environmental conditions where the maximum temperature is about 130 ° C. at the part facing the cylinder head cover 2039 of the internal combustion engine outside the plug hole. There are advantages that can be made.

  Further, the coil case 205b and the igniter case 205a are fixed by a method of joining with an adhesive 2033, a method of simultaneously casting and fixing with an insulating epoxy resin 206 to be filled, and a coil case 205b and an igniter case 205a. Are separately manufactured in advance, and then integrally molded and fixed, and any method is possible.

  FIG. 29 is a cross-sectional view showing a state in which the coil case and the igniter case according to another embodiment of the present invention are joined together at a joint portion. That is, it is a view showing a state of the case during molding in the method of integrally molding and fixing described above in a cross section.

  In the figure, 2034a is a left and right slide mold of the mold, 2034b is a core mold, and an arrow is a movable slide direction of each mold. In the case of integral molding, if one of the stepped portion 205c and the stepped portion 205d is configured to be embedded in the other case to be integrally molded, the embedded stepped portion is prevented from coming off or stopped. This is also effective because it can be used for prevention and can be prevented from joining (joining) and coming off or preventing rotation in one step of molding.

  As described above, the coil case 205b and the igniter case 205a that accommodates the igniter unit 2020 and the like and also serves as the connector 2024 are separately molded, so that the cylindrical shape satisfying the characteristics required for the connector and the coil case respectively. An ignition device for an internal combustion engine can be provided.

  Further, if the shape of the igniter case 205a is arranged such that the connector 2024 extends in the lateral direction of the igniter unit 2020, that is, the connector 2024 extends in a direction perpendicular to the hole axial direction of the plug hole of the internal combustion engine, The overall length in the vertical direction of the ignition device can be shortened, and space efficiency can be improved.

  In general, the ignition device is connected to a control device or the like having a mating connector with a different specification. However, the connector orientation or mounting position of the mating connector is different, and the shape of the ignition device is different for each internal combustion engine. It is a connector. According to the present invention, the above correspondence can be dealt with by changing the dimensions only on the igniter case 205a side, so that the coil case 205b side can be shared, the parts can be standardized, and the ignition for the internal combustion engine can be made inexpensively. This is effective in terms of providing a device.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 22 is a partial sectional view showing an internal combustion engine ignition device according to an embodiment of the present invention. The internal combustion engine ignition device of FIG. 22 is shown attached to the internal combustion engine. 23 is a bird's-eye view showing the internal combustion engine ignition device of FIG. 24 is a bird's eye view showing a part of the internal combustion engine and the internal combustion engine ignition device of FIG. The configuration of the internal combustion engine ignition device according to the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 23, the external appearance of a cylindrical ignition device (hereinafter abbreviated as “ignition device”) 2040 of the present embodiment includes a case 201, a side core 202, a rubber boot 203, and a seal rubber 204. Returning to FIG. 22, in the ignition device 2040, the coil portion 2020 is housed in the coil case 201 a of the cylindrical case 201. An annular seal rubber 204 is provided in the coil case 201a on the side in contact with the cylinder head cover 206 (inserted and inserted), and a rubber boot 203 is provided in the coil case 201a on the side in contact with the spark plug 209. . The upper end portion 204 e of the seal rubber 204 is in contact with the lower surface of the case 201 on the side in contact with the cylinder head cover 206. And the side core 202 has the protrusion part 202a in the outer peripheral surface. In addition, although the cylindrical part said by a present Example mainly corresponds to the coil case 201a, it is called a cylindrical part including the lower surface of the case 201 which the seal rubber 204 contact | abuts for convenience.

  On the other hand, a plug hole into which the coil case 201a as the cylindrical portion of the ignition device is inserted in the axial direction is provided in the cylinder head cover 206 and the plug tube 207. As shown in FIGS. 22 and 24, the plug hole of the cylinder head cover 206 has a bank-shaped tip portion, in other words, a circular tubular shape. Further, the plug hole of the plug tube 207 is a circular tube, the diameter of the circular tube is smaller than the circular tube of the cylinder head cover 206, and the tip of the plug tube 207 as the end of the inner circular tube is It is arranged at a lower position that is recessed from the tip of the cylinder head cover 206 as the end of the outer circular tube.

  In other words, the plug hole of the internal combustion engine of the present embodiment is a concentric double circular tube in which the end of the inner circular tube is recessed from the end of the outer circular tube, and the spark plug 209 is provided at the bottom of the plug hole. It can be said that it has a housing structure.

  When the inner diameter of the plug hole of the cylinder head cover 206 is φD9 and the outer diameter of the cylindrical portion of the ignition device (that is, the portion corresponding to the coil case 201a and the side core 202) is φD, the clearance is generally φD9−φD = 2. The thickness necessary for the seal rubber 204 to bend cannot be sufficiently secured. In particular, the inner diameter φD5 of the plug hole of the plug tube 207 has a relationship of φD9> φD5, and the gap is about φD5-φD = ˜2 (mm), and it is more difficult to ensure the seal rubber 204 to bend.

  On the other hand, since the cylinder head cover 206 and the engine block 208 are manufactured separately, generally, the plug hole of the cylinder head cover 206 and the plug hole of the plug tube 207 attached to the engine block 208 are “displaced”. . That is, as a “deviation” between both plug holes, a variation dimension of about 1 (mm) occurs both in the radial direction and in the axial direction. Even when the plug hole positions of the cylinder head cover 206 and the plug tube 207 are shifted as described above, the seal rubber 204 must form a seal structure.

  By the way, as shown in FIG. 22, the ignition device is electrically connected to the ignition plug 209 and then fixed to the cylinder head 206 via the screw 205. When the screw 205 is tightened, a reaction force of the seal rubber 204 is generated in the seal portion where the seal rubber 204 and the cylinder head cover 206 abut in the direction opposite to the insertion direction of the ignition device.

  Next, the seal structure of the seal rubber according to the present invention will be described.

  FIG. 25 is a cross-sectional view showing a seal rubber according to an embodiment of the present invention. 26 is a cross-sectional view showing a seal structure of an internal combustion engine ignition device using the seal rubber of FIG. The configuration and operation of this embodiment will be described. Also in this embodiment, the outer diameter of the cylindrical portion of the ignition device is φD, the inner diameter of the plug hole of the cylinder head cover 206 is φD9, and the inner diameter of the plug hole of the plug tube 207 is φD5.

  As shown in FIG. 25, the seal rubber 204 includes a conical portion 204a having an inner diameter φD1, an inner cylindrical portion 204c having an inner diameter φD2 and an outer diameter φD3, and a stepped portion 204b having a dimensional relationship of φD1 <φD <φD2. The flange portion 204d that forms a surface extending in the radial direction, the above-described upper end portion 204e, the recessed portion 204f provided in the flange portion 204d, and the outer cylindrical portion 204g. The seal rubber 204 is press-fitted and fixed to the cylindrical portion of the ignition device (that is, the coil case 201a or the side core 202).

When the seal rubber 204 has the stepped portion 204b having a relationship of φD1 <φD <φD2, the press-fitting allowance on the conical portion 204a side can be increased.

  That is, since the inner cylindrical portion 204c having the inner diameter φD2 is larger than the outer diameter φD of the cylinder portion of the ignition device, the sealing rubber 204 can be easily fitted into the cylindrical portion, and the conical portion 204a having the inner diameter φD1 There is an advantage that a sufficient thickness for press-fitting the portion 204a can be secured. Further, since the press-fitting allowance of the conical portion 204a can be increased, the pressure input is increased, and there is an advantage that the conical portion 204a is prevented from being turned over when the ignition device is inserted into the plug hole of the plug tube 207.

  On the other hand, the tapered surface of the conical portion 204a serves as a guide when the ignition device is inserted into the plug tube 207. That is, the seal rubber 204 has a conical portion 204a and a conical tip portion 204s that are tapered so that the outer diameter gradually decreases toward the tip end in the direction of the spark plug 209 in the state of being inserted into the cylindrical portion. . Further, the outer peripheral surface of the inner cylindrical portion 204c of the seal rubber 204 is not in contact with the inner peripheral surface of the inner diameter (φD9) of the plug hole of the cylinder head cover 206 (φD3 <φD9). It is also easy to insert into the plug hole.

By the way, the protruding portion 202a provided on the side core 202 as the cylindrical portion has a shape protruding partly or entirely around the outer periphery of the cylindrical portion, and a cone that is the tip of the seal rubber 204 fitted and inserted into the cylindrical portion on the ignition plug side. From the aforementioned conical tip 204s of the portion 204a, the spark plug 209
It is formed at a close part. The outer diameter φD4 of the protruding portion 202a has a dimensional relationship such that φD <φD4 <φD5, and the outer diameter of the conical tip portion 204s of the inserted seal rubber 204 is smaller than the outer diameter φD4 of the protruding portion 202a. Has been. Thereby, the sealing rubber 204 can be prevented from being turned up.

  That is, in a state where the seal rubber 204 is inserted into the cylindrical portion of the ignition device, the conical tip portion 204s of the seal rubber 204 is hidden behind the projection 202a (outer diameter φD4) and the conical tip portion 204s of the 204 is turned up. Will be prevented. The protrusion 202a may be provided on the coil case 201a as a cylindrical portion.

On the other hand, in the seal rubber 204 of this embodiment, when the ignition device is inserted into the plug hole as shown in FIG. 26, the tip end portion 206a of the cylinder head cover 206 and the seal rubber 204
A seal structure is formed by contact with the flange portion 204d that forms a surface extending in the radial direction. Then, water intrusion into the cylinder head cover 206 is prevented.

That is, as described above, the tip end portion 206a as a plug hole has a variation dimension of about 1 mm in the axial direction. However, the flange portion 204d of the seal rubber 204 abuts on the tip end portion 206a of the cylinder head cover 206 and moves in the axial direction. When it is pressed, it is deformed in the axial direction and sealed, so that flooding and the like are prevented.

  The extending surface extending in the radial direction formed on the flange portion 204d refers to a surface extending and expanding in the radial direction of the cylindrical portion (that is, the plug hole) of the ignition device, and the distal end portion 206a in the radial direction. This means that even if the displacement is about 1 mm, the extending surface always comes into contact with the distal end portion 206a of the cylinder head cover 206 that has been displaced. Therefore, the width of the extending surface of the flange portion 204d is large enough to absorb the displacement of the plug hole, in other words, in the radial direction of the tip portion 206a (outer circular tube end portion) that comes into contact. It must be wide enough to escape. For example, the width is at least larger than the end portion dimension of the tip end portion 206a and the maximum “deviation” dimension.

On the other hand, as described above, the tapered conical portion 204 a serves as a guide when the cylindrical portion of the ignition device 2040 is inserted into the plug hole of the plug tube 207. “Centering” will take precedence. Therefore, it is necessary to absorb the maximum “deviation” dimension between the plug hole of the cylinder head cover 206 and the seal rubber 204. In order for the above-described extending surface of the seal rubber 204 to perform the sealing function while absorbing the positional deviation. It will be essential.

As described above, the feature of the present invention is that the cylindrical portion inserted in the plug hole in the axial direction so as to be connected to the spark plug at the bottom of the plug hole and the tip end portion of the plug hole are brought into contact with the plug hole. And a sealing rubber fitted into the cylindrical portion so as to prevent water intrusion of the cylindrical ignition device, wherein the sealing rubber is in contact with the tip portion from the axial direction, is sufficiently bent in the axial direction and has a diameter. The position of the plug hole generated in the axial direction and / or the radial direction due to having a seal structure that can escape in the direction (for example, a flange portion on which a extending surface extending in the radial direction is formed) A cylindrical igniter capable of absorbing the deviation and reliably preventing the flooding is provided.

In other words, another feature of the present invention is that the seal rubber inserted into the plug hole of the concentric double tube structure in which the end portion of the inner circular tube is recessed from the end portion of the outer circular tube is the end portion of the outer circular tube. A cone having a flange portion formed with a surface extending in the radial direction of the cylindrical portion so as to prevent water intrusion into the plug hole and a tapered surface that contacts the inside of the inner circular tube and guides the seal rubber And having a part. If the seal rubber has such a configuration, the flange portion is pressed in the axial direction by abutting the end of the outer circular tube and deformed in the axial direction to absorb the axial displacement of the plug hole, and The extending surface of the buttocks also absorbs the displacement in the radial direction of the plug hole, so that the displacement of the seal rubber and the plug hole is securely sealed, and a highly reliable ignition device for internal heat engines with excellent waterproofness is obtained. Provided.

In the above configuration, it is preferable that the outer peripheral surface of the inner cylindrical portion 204c of the seal rubber is not in contact with the inner peripheral surface of the outer plug hole circular tube because it is easy to insert the seal rubber into the plug hole. .

Since the variation is sufficiently absorbed as described above, the reaction force of the seal rubber 204 generated in the axial direction when the ignition device is fixed to the cylinder head 206 via the screw 205 is reduced. There is an advantage that distortion in the axial direction added to the mounting position is reduced, and deformation of the case 1 is prevented.

Furthermore, another feature of the present invention is that the tip portion 206a is contacted from the axial direction between the lower surface of the case 1 as a cylindrical portion (strictly, a portion forming a part of the cylindrical portion) and the flange portion 204d. The gap 2040 is intentionally formed so as to allow the bulge of the flange portion 204d that is in contact and bent and deformed in the axial direction to escape. The gap 2030 serves as an axial escape portion of the seal rubber 204, and the escape portion sufficiently absorbs the axial variation, so that the seal can be surely performed.

Two examples of the intentionally formed gap 2030 are shown. That is,
In FIG. 26, the gap 2030 in the left figure is an example formed between the lower surface of the case 201 and the recessed portion 204f provided in the flange portion 204d. And the gap 2030 in the right figure
Shows an example formed between a case recess 201 f provided on the lower surface of the case 201 and a flange 204 d without a recess of the seal rubber 204. By the way, although the seal | sticker increases reliably with the space | gap 2030, it cannot be overemphasized that there is no space | gap 2030 and it is possible to use the sufficiently flexible seal rubber 204.

  Next, another embodiment will be described.

  FIG. 27 is a cross-sectional view showing a seal rubber according to another embodiment of the present invention.

FIG. 28 is a cross-sectional view showing a seal structure of an internal combustion engine ignition device using the seal rubber of FIG.

This embodiment mainly corresponds to the case where the seal structure cannot be formed by being sufficiently bent in the axial direction as shown in FIGS. 25 and 26, and an example of a structure in which the seal is bent greatly in the radial direction. Is shown.

As shown in FIG. 27, the seal rubber 204 has a dimensional relationship of φD7 <φD <and a mountain-shaped conical portion 204a having an outer diameter φD8 and an inner diameter φD6 and both tapered surfaces, an inner cylindrical portion 204c having an inner diameter φD7. It comprises a stepped portion 204b having φD6, a flange portion 204d, an upper end portion 204e, a recessed portion 204f provided in the flange portion 204d, and an outer cylindrical portion 204g.

  And it is inserted and fixed to the cylindrical part of an ignition device.

  It is obvious that the radial thickness t of the inner cylindrical portion 204c is preferably in the following relationship. (ΦD7 + 2t) <φD9 The stepped portion 204b has a relationship of φD7 <φD <φD6. The inner cylindrical portion 204c can be press-fitted and the conical portion 204a has a thickness at the conical portion 204a. Even when the seal rubber 204 is increased, the seal rubber 204 is easily inserted into the cylindrical portion of the ignition device, and therefore, the thickness of the conical portion 204a can be sufficiently secured.

  In the seal rubber 204 of the present embodiment, the conical portion 204a abuts on the inner side of the plug hole of the cylinder head cover 206 (the portion of the inner diameter φD9), and the conical portion 204a is deformed to form a seal structure. Inundation is prevented.

That is, since the radial variation occurs at the distal end portion 206a of the cylinder head cover 206 as described above, the conical portion 204a has a dimensional relationship such that φD8> φD9. When the sealing rubber 204 is inserted into the plug hole, the conical portion 204a of the sealing rubber 204 is pressed inward and deformed, thereby absorbing radial variations. At this time, in this embodiment, a gap 2030 is formed as a relief portion. Since the gap 2030 further increases and sufficiently absorbs radial variations, it can be reliably sealed as in the above-described embodiment.

In addition, since it is set as the dimension structure which the clearance gap which consists of ((phi) D6- (phi) D) of the step part 204b shown in FIG. 25 previously holds, the space | gap 2030 of a present Example is formed.

  In other words, the conical portion 204a as a chevron-shaped conical portion having both tapered surfaces abuts against the inner surface of the plug hole of the cylinder head cover 206 during insertion to form a deflection in the radial direction while guiding the seal rubber 204. It can be said that it is possible to seal reliably because the gap dimension that occurs in the direction is absorbed and the gap that can absorb the deflection is formed inside, and the fluctuation dimension that occurs in the axial direction is sufficiently absorbed.

  28, in the case of the left-side image, the conical portion 204a of the seal rubber 204 is placed inside the plug hole of the cylinder head cover 206 in a state where the tip end portion 206a of the cylinder head cover 206 is not in contact with the flange portion 204d of the seal rubber 204. In this example, a left-side gap 2030 is formed.

  On the other hand, the gap 2030 in the right figure is formed at two places between the conical portion 204a of the seal rubber 204 and the inside of the plug hole of the cylinder head cover 206, and between the lower surface of the case 201 and the recessed portion 204f of the seal rubber 204. The example which is formed is shown. That is, in the case of the right diagram, an example in which the above-described two embodiments are applied simultaneously is shown.

In other words, the sealing rubber according to the present invention forms an extending surface in the radial direction that is wide enough to bend in the axial direction by abutting the tip of the plug hole from the axial direction and to escape the radial deviation of the distal end. And a taper that forms a gap in the radial direction while abutting against the inner surface of the plug hole at the time of insertion and guiding the seal rubber while inserting, and forming a gap capable of absorbing the deflection. It can be said that it has the chevron cone part which has a surface.

  As described above, by forming a seal structure that is sufficiently radially bent in the seal rubber portion of the ignition device, it is possible to absorb a positional deviation from the plug hole that is generated in the axial direction and / or the radial direction. 25, similarly to the embodiment shown in FIG. 26, a cylindrical igniter capable of reliably preventing flooding is provided.

  The embodiments shown in FIGS. 25 and 26 are suitable when the gap between φD9 and φD is very narrow. The embodiment shown in FIGS. 27 and 28 is more suitable for the case where there is a margin in the gap between φD9 and φD than in the case of FIGS.

The problems to be solved by the present embodiment and the characteristic effects of the configuration of the embodiment are summarized as follows.

A conventional ignition device for an internal combustion engine is disclosed in Japanese Patent Application Laid-Open No. 2-228011.
A) A non-oriented silicon steel sheet having a width longer than the outer peripheral length of the outer case is attached to the outside of the ignition device.
It is composed of spiral side cores stacked in multiple on the mounting case. Side core is about
It is made of a non-oriented silicon steel plate having a thickness of 0.1 mm containing 6.5% by weight of silicon. However,
In the above conventional ignition device, it takes a long time to manufacture the spiral side core.
In short, this resulted in an expensive ignition device.

In addition, the side core of the conventional igniter multiplexes the entire outer periphery of the outer case and completely
Surrounded by. In other words, this side core has a gap (empty
(Between) is not formed at all.

Therefore, the secondary voltage obtained with the conventional ignition device having the above side core configuration is low,
Depending on the conventional igniter, the required secondary voltage is higher than the secondary voltage required by the engine.
In some cases, the ignition device could not reliably ignite the engine.

In a conventional ignition device, an engine chassis having a plug hole portion for housing the ignition device.
Regardless of the material or length of the Linda head or cylinder head cover, the side core is the center core.
It is wound so as to have a cross-sectional area of the same level.

Furthermore, in the conventional ignition device, it is formed by primary coils at both ends of the center core.
Because it has a magnet that generates a magnetic flux in the opposite direction to the generated magnetic flux in the magnetic path, it is expensive.
It was an ignition device for an internal combustion engine.

An object of the present embodiment is to provide an internal combustion engine ignition device that can utilize the effective magnetic flux of the center core portion most efficiently when the ignition device is mounted in the plug hole portion of the engine. An object of the present invention is to provide an internal combustion engine ignition device that can reasonably reduce stray capacitance generated between a secondary coil and a side core.

It is another object of the present invention to provide an ignition device for an internal combustion engine in which the thickness and length of the side core can be changed depending on the material and length of the cylinder head and cylinder head cover of the plug hole portion of the engine. It is another object of the present invention to provide an internal combustion engine ignition device capable of changing the number and thickness of magnets inserted into one end of the center core or both ends of the center core.

In order to achieve the above object, in this embodiment, a center core, a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, an outer case, and silicon disposed on the outer periphery of the outer case It consists of a steel-made side core, and the primary coil and the secondary coil are an ignition device for an internal combustion engine disposed between the center core and the outer case, and this ignition device is formed by at least a cylinder head and a cylinder head cover of the engine. In the one housed in the plug hole portion, the side core has a slit for preventing a one-turn short circuit so as to obtain a predetermined secondary voltage higher than the required secondary voltage of the engine.

When both the cylinder head and cylinder head cover are made of aluminum, the side core
For example, a directional silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm or a non-oriented silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm is rolled into a tube.

When both the cylinder head and cylinder head cover are made of aluminum, the side core
For example, two or three directional films having a thickness of 0.3 to 0.5 mm and a total thickness of 0.6 mm or more.
It has a base steel plate or one non-oriented silicon steel plate and at least one plate thickness of 0.3 to 0.5 mm.
It is formed by rolling a silicon steel plate made of grain-oriented silicon steel plate and having a total thickness of 0.6 mm or more into a tubular shape. This
In this case, the upper end of the side core is the same as the upper end of the cylinder head cover, or the center
It is below the upper end of the core.

The cylinder head is made of aluminum and the cylinder head cover is made of thermoplastic synthetic resin (for example,
For example, polypropylene, nylon 6, nylon 66, nylon 12, etc.)
Is formed, for example, by rolling a directional silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm or a nondirectional silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm into a tubular shape. . In this case, the upper end of the side core is approximately the same as the upper end of the cylinder head cover or below the upper end of the center core.

When the cylinder head is made of aluminum and the cylinder head cover is made of a thermoplastic synthetic resin (for example, polypropylene, nylon 6, nylon 66, nylon 12, etc.), the side core has a thickness of, for example, 0.3 to 0.5 mm. Two or three directional silicon steel plates having a total thickness of 0.6 mm or more, or one non-oriented silicon steel plate having a thickness of 0.3 to 0.5 mm and a thickness of 0.3 to 0.5 mm. A silicon steel plate made of at least one grain-oriented silicon steel plate and having a total thickness of 0.6 mm or more is rounded into a tubular shape. In this case, the upper end of the side core is approximately the same as the upper end of the cylinder head cover or below the upper end of the center core.

The cylinder head is made of aluminum and the cylinder head cover is made of thermoplastic synthetic resin (for example,
Polypropylene, nylon 6, nylon 66, nylon 12, etc.)
When an iron plug tube is press-fitted into the plug hole, the side core is
A directional silicon steel sheet having a sheet thickness of 0.3 to 0.5 mm or a sheet thickness of 0.3 to 0.5 mm.
It is formed by rolling a non-oriented silicon steel sheet into a tubular shape. In this case, the upper end of the side core
The upper end of the solder head and the upper end of the steel plug tube are the same as the upper end of the higher
Or below the upper end of the center core.

The cylinder head is made of aluminum and the cylinder head cover is made of thermoplastic synthetic resin (for example,
Polypropylene, nylon 6, nylon 66, nylon 12, etc.)
When an iron plug tube is press-fitted into the plug hole, the side core is, for example, a plate
Two or three directional silicon steels having a thickness of 0.3 to 0.5 mm and a total thickness of 0.6 mm or more, or
One non-oriented silicon steel sheet having a plate thickness of 0.3 to 0.5 mm and a small number having a plate thickness of 0.3 to 0.5 mm.
A silicon steel plate with a total thickness of 0.6 mm or more made of at least one grain-oriented silicon steel plate is rolled up into a tubular shape.
Made. In this case, the upper end of the side core is connected to the upper end of the cylinder head and the steel plug tube.
The upper end of the core is the same as the upper end of the higher one, or lower than the upper end of the center core.
The

At one end of the center core or both ends of the center core, the magnetic flux formed by the primary coil and
A magnet that generates a magnetic flux in the opposite direction in the magnetic path is installed. Cylinder head and cylinder head
When both lid covers are made of aluminum, magnets are attached to both ends of the center core
However, the magnetic flux can be generated efficiently. Cylinder head is made of aluminum and cylinder
If the head cover is made of thermoplastic synthetic resin, attach a magnet to one end of the center core.
The magnetic flux can be generated efficiently simply by In this case, the magnet is the center core
Cylinder made of thermoplastic resin rather than mounted on the cylinder head cover side
A magnetic flux can be generated more efficiently by mounting on the head side.

According to the present embodiment, the side core has a slit that prevents a one-turn short circuit of the magnetic flux, and a predetermined secondary voltage that is equal to or higher than the required secondary voltage of the engine can be obtained. When mounted, it is possible to provide an internal combustion engine ignition device that can utilize the effective magnetic flux of the center core most efficiently. Further, it is possible to provide an internal combustion engine ignition device that can reasonably reduce the stray capacitance generated between the secondary coil and the side core.

Depending on the material and length of the cylinder head and cylinder head cover of the engine plug hole
Change the thickness and length of the side core, and one end of the center core or both
Providing an inexpensive internal combustion engine ignition device by changing the number and thickness of magnets at the end
it can.

Furthermore, according to the present embodiment, a reliable seal structure can be formed even when the positional relationship between the seal rubber and the plug hole is shifted in the radial direction, the axial direction, or both directions. There is an effect that can be prevented.

The embodiments described in the examples are summarized as follows.

[Embodiment 1]
Center core, primary coil wound around primary bobbin, secondary coil wound around secondary bobbin
, An outer case, and a side core made of silicon steel plate disposed on the outer periphery of the outer case,
The primary coil and the secondary coil are disposed between the center core and the outer case.
An ignition device for an internal combustion engine, the ignition device comprising at least a cylinder head and a cylinder of the engine
In what is housed in the plug hole part formed with the head cover,
The side core has a slit for preventing a short turn of magnetic flux, and the engine
An internal combustion engine ignition device characterized in that a predetermined secondary voltage equal to or greater than the required secondary voltage is obtained.

[Embodiment 2]
In Embodiment 1, the ignition device for an internal combustion engine, wherein the side core is formed of one of a directional silicon steel plate having a slit and a non-directional silicon steel plate having a slit.

[Embodiment 3]
In Embodiment 1, the side core has a laminated structure of at least two directional silicon steel plates, each directional silicon steel plate has a slit, and these slits are aligned at substantially the same position. An ignition device for an internal combustion engine.

[Embodiment 4]
In Embodiment 1, the side core has a laminated structure of at least one non-oriented silicon steel plate having a slit and at least one directional silicon steel plate having a slit, and the side core is made of the at least one non-oriented silicon steel plate. An ignition device for an internal combustion engine, wherein the slit and the slit of the at least one grain-oriented silicon steel sheet are aligned at substantially the same position.

[Embodiment 5]
In Embodiment 1, when both the cylinder head and the cylinder head cover are made of aluminum, the side core is formed by rolling two or three directional silicon steel plates having a plate thickness of 0.3 to 0.5 mm into a substantially tubular shape. An internal combustion engine ignition device characterized in that a total plate thickness is 0.6 mm or more, each directional silicon steel plate has slits, and these slits are aligned at substantially the same position.

[Embodiment 6]
In an embodiment 5, the ignition device for an internal combustion engine, wherein the upper end of the side core is approximately the same as the upper end of the cylinder head or lower than the upper end of the center core.

[Embodiment 7]
In Embodiment 1, when the cylinder head is made of aluminum and the cylinder head cover is made of a thermoplastic synthetic resin, the side core is made of two or three directional silicon steel plates each having a thickness of 0.3 to 0.5 mm. An ignition device for an internal combustion engine, characterized in that each directional silicon steel sheet has slits and these slits are aligned at substantially the same position.

[Embodiment 8]
In an embodiment 7, the ignition device for an internal combustion engine, wherein the upper end of the side core is approximately the same as the upper end of the cylinder head or below the upper end of the center core.

[Embodiment 9]
In Embodiment 1, when an iron plug tube is press-fitted into the plug hole portion of the engine, the side core is a non-oriented silicon steel sheet or slit having a thickness of 0.3 to 0.5 mm having a slit. An ignition device for an internal combustion engine, characterized by comprising a directional silicon steel sheet having a thickness of 0.3 to 0.5 mm.

[Embodiment 10]
In an embodiment 9, the ignition device for an internal combustion engine, wherein the upper end of the side core is approximately the same as the upper end of the cylinder head cover or below the upper end of the center core.

[Embodiment 11]
In Embodiment 5, when an iron plug tube is press-fitted into the plug hole portion of the engine, the side core is a single non-oriented silicon steel plate or slit having a thickness of 0.3 to 0.5 mm having a slit. An ignition device for an internal combustion engine, characterized by comprising a directional silicon steel sheet having a thickness of 0.3 to 0.5 mm.

[Embodiment 12]
In an eleventh embodiment, the upper end of the side core is equal to or higher than the upper end of the upper end of the cylinder head and the upper end of the iron plug tube, or is lower than the upper end of the center core. Engine ignition device.

[Embodiment 13]
The ignition device for an internal combustion engine according to the first embodiment, wherein a magnet that generates a magnetic flux in a direction opposite to the magnetic flux formed by the primary coil in a magnetic path is provided at at least one end of the center core.

[Embodiment 14]
An igniter portion and a coil portion having connectors that are electrically connected and arranged in close proximity;
In an ignition device for an internal combustion engine comprising a igniter part and a storage body that houses the coil part,
The housing accommodates the coil portion and is standardized in a plug hole of an internal combustion engine.
The coil storage part to be inserted and the igniter part are accommodated and are different from each other outside the plug hole.
Divided into two parts: an igniter housing having the connector connected to the mating connector of the specification
And
The coil storage portion and the igniter storage portion are integrally coupled at the two divided portions.
An ignition device for an internal combustion engine.

[Embodiment 15]
An igniter portion and a coil portion having connectors that are electrically connected and arranged in close proximity;
A storage body for storing the igniter part and the coil part, and the storage body inserted by being inserted into the storage body
And a sealing body that isolates the environment inside and outside the plug hole of the internal combustion engine,
The storage body accommodates the coil portion at the portion where the seal body is fitted and inserted.
A coil housing portion to be inserted into the lug hole and the igniter portion for accommodating the plug hole;
An igniter storage portion having the connector connected to a mating connector of different specifications outside
Divided into two,
The coil storage portion and the igniter storage portion are integrally coupled at the two divided portions.
An ignition device for an internal combustion engine.

[Embodiment 16]
In Embodiment 14 or Embodiment 15, the coil housing portion has a material characteristic excellent in adhesion to an insulating resin that insulates the coil part on a base resin having a material characteristic excellent in heat resistance and voltage resistance. An ignition device for an internal combustion engine, wherein the ignition device is formed of a mixed material obtained by mixing a compounding agent having the same.

[Embodiment 17]
In Embodiment 16, the base resin is a polyphenylene sulfide resin, and the compounding agent is a modified polyphenylene oxide resin.

[Embodiment 18]
The ignition device for an internal combustion engine according to the fourteenth or fifteenth embodiment, wherein the coil housing portion is made of polyphenylene sulfide resin.

[Embodiment 19]
In Embodiment 14 or Embodiment 15, the coupling portion between the coil housing portion and the igniter housing portion is concentric with the contact surface perpendicular to the axial direction of the coil housing portion and the axis of the coil housing portion. An ignition device for an internal combustion engine, comprising:

[Embodiment 20]
In the fourteenth embodiment or the fifteenth embodiment, the coupling between the coil housing portion and the igniter housing portion is performed by integrally forming the igniter housing portion with the previously formed coil housing portion. Ignition device for internal combustion engine.

[Embodiment 21]
The end of the inner tube is a concentric double tube that is recessed from the end of the outer tube.
A cylindrical portion inserted in the axial direction into a plug hole of an internal combustion engine containing a lug, and the plug
A seal rubber fitted into the cylindrical portion to prevent water intrusion into the hole,
The seal rubber can be bent in the axial direction by contacting the end of the outer circular tube from the axial direction and
A flange portion having an extending surface formed in the radial direction, with an area capable of escaping the radial deviation of the side circular tube end portion,
In order to guide the seal rubber in contact with the inner circular tube at the time of insertion, the spark plug
An internal combustion engine characterized by having a conical portion tapered toward the direction
Ignition device.

[Embodiment 22]
In an embodiment 21, the igniter for an internal combustion engine, wherein the flange portion is formed between the cylindrical portion so as to allow the bulge of the flange portion which is bent and deformed in the axial direction to escape.

[Embodiment 23]
In Embodiment 21, the cylindrical portion has a protrusion formed at a portion closer to the spark plug than the conical tip portion of the conical portion and having an outer diameter smaller than the outer diameter of the conical tip portion. Ignition device for internal heat engine.

[Embodiment 24]
In Embodiment 21, Embodiment 22 or Embodiment 23, the seal rubber includes the conical portion including the conical tip portion and having an inner diameter φD1, an inner cylindrical portion having an inner diameter φD2, and each inner diameter dimension is φD1 <φD <. An ignition device for an internal combustion engine comprising a stepped portion having a relationship of φD2.

Where φD is the outer diameter of the cylindrical portion.

[Embodiment 25]
Axial to the plug hole of an internal combustion engine with a circular tubular tip and containing a spark plug at the bottom
A cylindrical portion inserted in the direction and inserted into the cylindrical portion so as to prevent water from entering the plug hole.
An internal combustion engine ignition device comprising a sealing rubber,
The seal rubber contacts the tip portion from the axial direction and can be bent in the axial direction.
A buttock with an extending surface formed in the radial direction, which is wide enough to escape the radial shift;
When inserted, it abuts against the inner surface of the plug hole to guide the seal rubber and flex in the radial direction.
And has both tapered surfaces forming a gap inside which can absorb the deflection.
An ignition device for an internal combustion engine, characterized by having an angle cone.

The present invention can be used for a cylindrical ignition device having a side core having a slit. The side core having a slit is composed of one directional silicon steel sheet, one non-directional silicon steel sheet, a laminated structure composed of at least two directional silicon steel sheets and non-directional silicon steel sheets, or at least two directional silicon sheets. It is comprised from one selected from the laminated structure which consists of a steel plate.

1 is a cross-sectional view showing an embodiment of an ignition device for an internal combustion engine of the present invention. The horizontal sectional view of the ignition device for internal-combustion engines. (A) is a perspective view of the inner side core of the ignition device for internal combustion engines of this invention, (b) is a perspective view of the outer side core of the ignition device for internal combustion engines of this invention. FIG. 5A is a perspective view of a primary bobbin having a groove (notch) of the ignition device for an internal combustion engine of the present invention, and FIG. 5B is a plan view of the primary bobbin having the groove of FIG. The figure which shows the flow of the magnetic flux at the time of mounting the ignition device for internal combustion engines of this invention in an engine. FIG. 3 is a diagram showing the relationship between the length of the side core of the ignition device for an internal combustion engine of the present invention and the secondary voltage of the engine. Sectional drawing of the ignition device for internal combustion engines of this invention in case both the cylinder head and cylinder head cover of an engine are the products made from aluminum. Sectional drawing of the ignition device for internal combustion engines of this invention in case the cylinder head of an engine is a product made from aluminum and a cylinder head cover is made from a thermosetting resin. Sectional drawing of the ignition device for internal combustion engines of this invention in case the cylinder head of an internal combustion engine is made from aluminum, a cylinder head cover is made from a thermosetting resin, and an iron plug tube is accommodated in the plug hole part of an engine. (A) is a positional relationship diagram of the center core and the magnet of the ignition device for an internal combustion engine of the present invention in which the magnet is positioned above the center core, and (b) is an internal combustion engine of the present invention in which the magnet is positioned below the center core (C) is a positional relationship diagram of the center core and magnet of the internal combustion engine ignition device of the present invention in which two magnets are positioned at the upper part and the lower part of the center core. Sectional drawing which shows the other Example of the ignition device for internal combustion engines of this invention when the attachment position of an ignition device is located lower than the upper end of a center core. Explanatory drawing which shows the flow of the heat | fever which generate | occur | produced with the ignition device for internal combustion engines of this invention. The circuit diagram of the igniter case unit of the exterior case of the ignition device for internal combustion engines of this invention. It is sectional drawing which shows the structure of the ignition device for internal combustion engines of one Example by this invention. It is an expanded view of the main components of the Example of FIG. It is sectional drawing of the state mounted in the internal combustion engine in the Example of FIG. It is a bird's-eye view of the igniter case of one Example by this invention. It is a bird's-eye view of the coil case of one Example by this invention. It is sectional drawing which shows the state which both couple | bonded integrally in the coupling | bond part of the coil case and igniter case of one Example by this invention. It is sectional drawing which shows the state which couple | bonded together in the coupling | bond part of the coil case and igniter case of other Examples by this invention. It is sectional drawing which shows the state which couple | bonded together both in the coupling | bond part of the coil case and igniter case of another Example by this invention. 1 is a partial cross-sectional view showing an internal combustion engine ignition device according to an embodiment of the present invention. It is a bird's-eye view which shows the ignition device for internal combustion engines of FIG. It is a bird's-eye view which shows a part of ignition device for internal combustion engines of FIG. 22, and an internal combustion engine. It is sectional drawing which shows the seal rubber of one Example by this invention. It is sectional drawing which shows the seal structure of the ignition device for internal combustion engines using the seal rubber of FIG. It is sectional drawing which shows the seal rubber of the other Example by this invention. It is sectional drawing which shows the seal structure of the ignition device for internal combustion engines using the seal rubber of FIG.

Explanation of symbols

11 ... Primary bobbin, 12 ... Primary coil, 13 ... Secondary bobbin, 14 ... Secondary coil, 15 ...
Outer case, 17 ... center core, 18 ... side core, 18a ... inner silicon steel plate, 18a1,
18b1 ... slit, 18b ... outer silicon steel plate, 20 ... magnet, 41 ... cylinder head, 42 ... cylinder head cover, 43 ... plug hole, 44 ... spark plug, 4205 ...
Iron plug tube.

Claims (11)

A cylindrical coil case portion that houses an ignition coil that is inserted into the plug hole of the internal combustion engine in the axial direction, and a seal rubber that is inserted into the cylindrical coil case portion so as to seal the plug hole from the outside,
The seal rubber has an inner cylindrical portion attached to the cylindrical coil case portion, a flange portion extending in the radial direction, and an outer cylindrical portion formed on an outer peripheral portion of the flange portion.
An outer peripheral surface portion that contacts the inner diameter portion of the plug hole and an inner peripheral surface portion that contacts the outer peripheral surface of the cylindrical coil case are formed at the end portion of the inner cylindrical portion of the seal rubber on the spark plug side. and,
And on the outer periphery of the cylindrical coil case part, a cylindrical side core having a slit along the axial direction is mounted,
On the upper part of the cylindrical coil case part, an igniter storage case part is provided,
The ignition device for an internal combustion engine, wherein a gap between an upper end surface of the seal rubber and a lower end surface of the igniter storage case portion is sealed with the seal rubber . In claim 1,
The inner peripheral surface portion of the inner cylindrical portion of the seal rubber is formed by a small diameter portion that abuts on the outer peripheral surface of the cylindrical coil case and extends outward when inserted into the cylindrical coil case portion. Ignition device for internal combustion engine. In claim 1,
The outer peripheral surface portion of the inner cylindrical portion of the seal rubber abuts on the inner diameter portion of the plug hole and bends inward, whereby the inner peripheral surface portion of the inner cylindrical portion contacts the outer peripheral surface of the cylindrical coil case portion. An ignition device for an internal combustion engine, wherein the ignition device is deformed so as to contact. In any one of claims 1 to 3,
The ignition device for an internal combustion engine, wherein the plug hole is formed in a plug tube. In any one of claims 1 to 3,
An ignition device for an internal combustion engine, wherein the plug hole is formed in a cylinder head. What is described in claim 4,
An inner diameter (D1) of the inner peripheral portion is formed smaller than an outer diameter of the cylindrical coil case portion in a state before being attached to the cylindrical coil case portion, and the outer peripheral portion is larger in diameter than an inner diameter portion of the plug hole. An ignition device for an internal combustion engine, characterized in that In any one of claims 1 to 3,
When the thickness of the portion of the inner cylindrical portion extending to the plug side from the position of the flange portion is t and the inner diameter of the inner cylindrical portion in the portion where the thickness is t is D7, the plug side of the inner cylindrical portion is The inner diameter D8 at the end has a relationship of D7 <D8 <D7 + 2t, and the outer diameter D9 of the inner cylindrical portion of the portion where the inner diameter is D8 is formed larger than the inner diameter of the plug hole. An ignition device for an internal combustion engine. In any one of claims 1 to 7,
An ignition device for an internal combustion engine, wherein the outer peripheral portion is formed by a chevron cone having both tapers. In any one of claims 1 to 8,
The flange portion is formed as an extending surface that extends in the radial direction, has a bending portion that is bent in the axial direction, and a gap that can escape the swelling of the flange portion that is bent and deformed in the axial direction is formed between the cylindrical portion and the cylindrical portion. An ignition device for an internal combustion engine characterized by being formed. 9. The outer peripheral surface of the cylindrical coil case according to claim 8, wherein an outer diameter smaller than an outer diameter of the chevron cone part is formed on a portion closer to a spark plug side end than a cone tip part of the chevron cone part. An ignition device for an internal combustion engine having a protrusion. In any of claims 8 or 10,
The seal rubber includes the conical portion including the tip of the cone and having an inner diameter φD6, an inner cylindrical portion having an inner diameter φD7, and a stepped portion in which the inner diameter dimensions have a relationship of φD7 <φD <φD6. (However, (phi) D is an outer diameter of a cylindrical coil case part) The internal combustion engine ignition device characterized by the above-mentioned.

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