JP2010135483A - Ignition coil for internal combustion engines - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil that exhibits waterproof performance, without fail, irrespective of the structure of the upper end surface of a plug hole. <P>SOLUTION: The ignition coil includes a base end part 2 exposing from the plug hole HO; and a substantially cylindrical-shaped projecting part 3, projecting from the base end part 2 and inserted in the plug hole. A rain cover 1 is arranged at the bottom face of a connection part 3a that extends in a radial direction at the base end side of the projecting part 3 and seals up the upper surface of the plug hole HO. The rain cover 1 has a central opening CT and is structured to have a disk shaped part DSK having the predetermined thickness and broadening in the radial direction, and a lip part LIP that extends from the circumference of the disk-shaped part DSK to the upper surface of the plug hole. The lip part LIP has a lip body part LP1 slightly inclined inward in the radial direction, and a lip front edge part LP2 extendedly provided to the lip body part LP1 bent outward in the radial direction. The lip front edge part LP2 forms a flat contact surface, with the lower surface extended in the radial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ignition coil that is inserted into a plug hole of an internal combustion engine, and more particularly to an ignition coil that exhibits reliable waterproof performance regardless of the structure of the upper end surface of the plug hole.

  In general, an internal combustion engine such as an engine employs a system in which an ignition coil is inserted into a plug hole adjacent to a combustion chamber, and an ignition plug attached to the bottom of the plug hole is driven. This type of ignition coil incorporates a primary coil that receives battery voltage and a secondary coil that generates a high voltage when the current of the primary coil is interrupted. The primary coil and the secondary coil have almost the entire length inside the plug hole. There are roughly divided into a method of arranging (pencil type) and a method of arranging the entire primary coil and secondary coil outside the plug hole. However, in any case, an appropriate waterproof seal member (hereinafter referred to as a rain cover) is attached to the ignition coil so that water does not enter the plug hole.

  FIG. 4 shows an example of a pencil type ignition coil, which includes a primary coil L1 and a secondary coil L2, a cylindrical protrusion 20 in which a main part is inserted into a plug hole HO, and a primary coil. A substantially cylindrical base end portion 21 including a switching element SW for controlling the current L1 and exposed from the plug hole HO is shown.

  In the illustrated ignition coil, a connecting portion 20a exposed from the plug hole HO is provided at the uppermost portion of the protruding portion 20, and a fixing bolt that penetrates the connecting portion 20a in the vertical direction is screwed into the ignition coil. Is fixed to the engine block. However, in many cases, the connecting portion 21a (not shown) is extended on the same plane as the base end portion 21, and the entire protruding portion 20 is inserted into the plug hole HO. In the case of the illustrated example, the fixing bolt is disposed on the back side of FIG. 4 and is not illustrated, but here, a state immediately before fixing the ignition coil to the engine block is illustrated.

  In any case, when attaching the ignition coil, the rain cover 30 is attached immediately below the base end portion 21 or directly below the connecting portion 20a as shown in FIG. The rain cover 30 is made of an elastic body such as rubber, and includes a disk part DSK having a central opening corresponding to the outer diameter of the protruding part 20 and a lip part LIP extending in a cylindrical shape downward from the periphery of the disk part DSK. Broadly divided. In the disk portion DSK, a gas passage GS that communicates the inside and outside of the rain cover 30 is formed in a groove shape to prevent the inside of the plug hole from being airtight. Note that a gas passage GS having a sufficient distance is formed so that water does not enter from the outside to the plug hole.

By the way, the conventional rain cover 30 is thinned so that the tip of the lip LIP is inclined inward and easily elastically deformed. Corresponding to this inwardly deformed structure, the protrusion PR is formed in an annular shape around the upper end of the plug hole HO, and when the fixing bolt is tightened from the state of FIG. 4, the lip portion LIP Is further bent inward and comes into contact with the protrusion PR (for example, see Patent Document 1 and Patent Document 2).
Japanese Patent Laid-Open No. 08-162253 JP 2002-299004 A

  As described above, the conventional rain cover 30 is configured to function by being in contact with the ridge PR, so that there is a problem that the ignition coil restricts the configuration of the upper surface of the engine block.

  In addition, when the conventional ignition coil is mounted on an engine block that does not have the protrusion PR, appropriate waterproof performance may not be exhibited. For example, if the middle of the gas passage GS is clogged for some reason, if the inside of the plug hole HO becomes negative pressure, the waterproof performance cannot be exerted, and there is a possibility that the droplets on the upper part of the engine block are sucked. It was. That is, the tip of the lip portion LIP that is easily deformed is deformed inwardly in response to the negative pressure inside the plug hole HO. A gap is formed on the stop surface, and the ingress of droplets cannot be prevented.

  The present invention has been made in view of the above problems, and does not restrict the configuration of the upper surface of the engine block, and an ignition coil that exhibits reliable waterproof performance regardless of the structure of the upper end surface of the plug hole. The purpose is to provide.

  In order to achieve the above object, the invention according to claim 1 includes a spark plug in which a primary coil and a secondary coil that are electromagnetically coupled are incorporated, and a high voltage generated in the secondary coil is disposed in a plug hole. An ignition coil that is supplied to the plug hole, and includes a base end portion that is exposed from the plug hole, and a substantially cylindrical protrusion that protrudes from the base end portion and is inserted into the plug hole. Or an elastic seal member is disposed on the bottom surface of the connecting portion extending in the radial direction on the base end side of the protruding portion to seal the upper surface of the plug hole. A disc portion having a central opening corresponding to the outer diameter of the protruding portion, having a predetermined thickness and spreading in the radial direction, and a lip extending from the periphery of the disc portion toward the upper surface of the plug hole Part, and the lip part is configured as described above. A lip body portion that is inclined inwardly in the radial direction with respect to the axial direction of the protruding portion; and a lip tip portion that is bent radially outward and extends to the lip body portion, and the lip tip portion Is characterized in that the lower surface forms a flat contact surface extending in the radial direction.

  The contact surface has a suitable sealing performance even in the worst case where the pressing force of the lip tip when the ignition coil is mounted is the lowest and the plug hole is in the maximum negative pressure. Is set to maintain. Specifically, a frictional force that maintains the sealing performance is required even in the worst case, but when a normal elastic material is used, as an appropriate contact surface, the thickness of the lip main body portion is 1. It is preferable to set the width to 5 to 2.0 times. Note that the thickness of the lip body is preferably set to 0.5 to 0.6 times the thickness of the disk.

  In addition, in a state in which an ignition coil is mounted on the connecting portion using a fixture, the lip main body portion is preferably configured to be able to slightly bulge outward in the radial direction. With this configuration, the pressing force to the engine block at the time of assembly of the ignition coil is stored as the elastic force of the lip portion, which is caused by a dimensional error in manufacturing or assembly of the ignition coil or vibration during operation. Misalignment can be absorbed, and sealing performance can be maintained appropriately.

  In addition, since the inner space sealed by the elastic seal member tends to expand by slightly bulging outward in the radial direction, the elastic seal member is flexible even against sudden pressure fluctuations in the plug hole. Sealing performance can be maintained by elastic deformation.

  The invention according to claim 5 is an ignition coil that incorporates an electromagnetically coupled primary coil and secondary coil, and supplies a high voltage generated in the secondary coil to an ignition plug disposed in a plug hole. A base end portion exposed from the plug hole, and a substantially cylindrical projecting portion protruding from the base end portion and inserted into the plug hole, and a bottom surface of the base end portion or the projecting portion An elastic seal member is disposed on the bottom surface of the connecting portion extending in the radial direction on the base end side of the plug to seal the upper surface of the plug hole, and the elastic seal member corresponds to the outer diameter of the protruding portion. A disk portion having a central opening and having a predetermined thickness and extending in the radial direction; and a lip portion extending from the periphery of the disk portion toward the upper surface of the plug hole. The lip portion is a lip extending in the axial direction of the protruding portion. A main body part and a lip front end part that is bent inward in the radial direction and extends to the lip main body part, and an outer peripheral surface of the lip front end part is 25 ° to the upper surface of the plug hole. In a state where an inclined surface of 45 ° is formed and an ignition coil is mounted using a fixture at the connection portion, almost the entire outer peripheral surface is configured to contact the upper surface.

  According to the experiment of the present inventor, if the inclination angle of the outer peripheral surface of the lip tip is set to 25 ° to 45 °, as long as a normal elastic material is used, reliable sealing performance can be obtained even in the worst case described above. Has been confirmed to maintain. Also in the present invention, it is preferable that the lip main body portion is configured to be able to slightly bulge radially outward when the ignition coil is mounted.

  The invention according to claim 7 is an ignition coil including a primary coil and a secondary coil that are electromagnetically coupled, and supplying a high voltage generated in the secondary coil to a spark plug disposed in a plug hole. A base end portion exposed from the plug hole, and a substantially cylindrical projecting portion protruding from the base end portion and inserted into the plug hole, and a bottom surface of the base end portion or the projecting portion An elastic seal member is disposed on the bottom surface of the connecting portion extending in the radial direction on the base end side of the plug to seal the upper surface of the plug hole, and the elastic seal member corresponds to the outer diameter of the protruding portion. A disk portion having a central opening and having a predetermined thickness and extending in the radial direction; and a lip portion extending from the periphery of the disk portion toward the upper surface of the plug hole. The lip portion extends in the axial direction of the protruding portion. The inner and outer lip body portions formed in a heavy shape, and a lip tip portion that is bent inward in the radial direction and extends to the outer lip body portion. An inclined surface is formed with respect to the upper surface of the plug hole, and the outer peripheral surface is in contact with the upper surface in a state where an ignition coil is mounted on the connecting portion using a fixture.

  In the present invention, the sealing surface is formed in an inner and outer double, and the outer sealing surface is formed in an annular shape having a predetermined width, so that reliable sealing performance can be exhibited.

  According to an eighth aspect of the present invention, there is provided an ignition coil comprising a primary coil and a secondary coil that are electromagnetically coupled, and supplying a high voltage generated in the secondary coil to a spark plug disposed in a plug hole. A base end portion exposed from the plug hole, and a substantially cylindrical projecting portion protruding from the base end portion and inserted into the plug hole, and a bottom surface of the base end portion, or An elastic seal member is disposed on the bottom surface of the connecting portion extending in the radial direction on the base end side of the projecting portion to seal the upper surface of the plug hole, and the elastic seal member has an outer diameter of the projecting portion. A disc opening having a predetermined thickness and having a predetermined thickness, and a lip portion extending from the periphery of the disc portion toward the upper surface of the plug hole. The lip portion extends in the axial direction of the protruding portion. In the state where the lip main body portion and a lip tip portion that extends from the lip main body portion and branches inward and outward in the radial direction are attached to the connecting portion using a fixing coil, At least the outer side of the lip tip is configured to be elastically deformed in the extending direction.

  Also in the present invention, since the sealing surface is formed in an inner and outer double, and the outer sealing surface is formed in an annular shape having a predetermined width, reliable sealing performance can be exhibited.

  The invention according to claim 9 is an elastic seal member attached to any one of the above ignition coils.

  According to the above-described present invention, it is possible to realize an ignition coil that exhibits reliable waterproof performance regardless of the structure of the upper end surface of the plug hole without restricting the configuration of the upper surface of the engine block.

  Hereinafter, the present invention will be further described based on examples. FIG. 1B is an abbreviated illustration of an ignition coil CL equipped with a rain cover 1 having a unique shape, and the primary coil L1, the secondary coil L2, the switching element SW, and the like are omitted. . That is, in FIG. 1, only the main part of the present embodiment is shown, and the rain cover 1 fitted around the coil case CA is mainly illustrated.

  Specifically, FIG. 1A shows a plan view of the coil case CA, and FIG. 1C shows a central sectional view of the coil case CA. FIG. 1B shows a state in which the coil case CA with the rain cover 1 attached is inserted into the plug hole HO. FIG. 1E is a plan view of the rain cover 1, and FIG. ) Shows an AA cross-sectional view of FIG.

  As shown in FIG. 1B and FIG. 1C, the illustrated coil case CA has a rectangular cylindrical base end portion 2 with a built-in switching element SW, and projects from the base end portion 2 in a substantially cylindrical shape. The projecting portion 3 is configured to be roughly divided. The projecting portion 3 is divided into a connecting portion 3a having a contact flange FL provided on the bottom surface, a cylindrical case main body portion 3b, and a slightly small-diameter case distal end portion 3c from the proximal end side toward the distal end side. Only the case body 3b and the case tip 3c are inserted into the plug hole HO.

  A primary coil L1 and a secondary coil L2 are concentrically accommodated in the connecting portion 3a and the case main body portion 3b over the entire length in the axial direction, and an insulating rubber material is externally fitted to the case tip portion 3c. Note that, in a state of use inserted into the plug hole HO, a spark plug (not shown) is received in the case tip 3c of the coil case.

  As shown in FIG. 1C, the base end side of the cylindrical case body 3 b has a mounting part 4 having a slightly larger diameter than the other parts and an inclined part 5 that is expanded toward the mounting part 4. Is formed. And the level | step difference is formed in the connection location of the inclination part 5 and the mounting part 4, and the rain cover 1 guided to the mounting part 4 from the inclination part 5 is hold | maintained reliably.

  The connecting portion 3a is configured by extending the base end of the case main body portion 3b radially outwardly immediately below the base end portion 2, and a bolt hole BT is formed in a part thereof. A contact flange FL having a peripheral shape corresponding to the peripheral shape of the base end portion 2 is formed on the bottom surface of the connecting portion 3a. The contact flange FL forms a flat surface orthogonal to the case body 3b.

  When the ignition coil CL is mounted, the bolt inserted into the bolt hole BT of the connection portion 3a is tightened into the engine block. Then, corresponding to the case main body 3b being guided by the plug hole HO and going straight, the contact flange FL is also correctly lowered in the axial direction of the plug hole HO.

  The rain cover 1 is an elastic body such as a rubber material. As shown in FIGS. 1D and 1E, the rain cover 1 includes a disk part DSK having a central opening CT having the same diameter as the outer diameter of the case main body part 3b, and a disk part. It comprises a substantially cylindrical lip portion LIP extending downward from the periphery of the DSK. The outer diameter of the disk part DSK is smaller than the outer diameter of the contact flange FL, so that the entire disk part DSK is uniformly pressed by the flat surface of the contact flange FL. Yes.

  As shown in FIG. 1 (e), concave groove-like gas passages GS 1 and GS 2 are formed on the upper surface of the disk portion DSK of the rain cover 1 so as to communicate the inside and outside of the rain cover 1. The arrows in FIG. 1 (e) indicate the direction of air flow from the outside to the inside of the plug hole. After the gas passage GS1 is made a half turn through a parallel path, the gas passage GS2 is further turned halfway in the opposite direction. Thus, the plug hole HO is shown.

  The lip portion LIP of the rain cover 1 is provided with a lip body portion LP1 having a plate thickness W of about 50 to 60% of the thickness of the disk portion DSK, and is bent and extended radially outward from the lip body portion LP1. It is configured to be divided into a lip tip portion LP2. The lip body portion LP1 is inclined inward in the radial direction, while the lower surface of the lip tip portion LP2 forms a flat contact surface extending in the radial direction (see FIG. 1D). The lip contact surface is formed in an annular shape having a contact width D of about 1.5 to 2.0 times the thickness W of the lip main body LP1. Each of the dimensions described above is the lip tip portion LP2 even in the worst case in which the pressing force of the lip tip portion LP2 when the ignition coil CL is mounted is the lowest and the plug hole HO is in the maximum negative pressure state. Is a design value set to maintain an appropriate sealing performance.

  Then, when the ignition coil CL is mounted, when the contact flange FL is slightly lowered and presses the rain cover in the axial direction, the center portion of the lip main body portion LP1 slightly bulges outward and the lower surface of the lip tip portion LP2. As a whole, the entire upper surface of the engine block comes into strong contact. Therefore, even if part of the gas passages GS1 and GS2 is closed and the plug hole HO becomes negative pressure, the sealed state is reliably maintained by the contact resistance of the contact width D, so there is a risk of liquid ingress There is no.

  That is, since the pressing force to the engine block at the time of assembly of the ignition coil CL is stored as the elastic force of the elastically deformed lip body portion LP1, a dimensional error in manufacturing or assembly of the ignition coil CL, It is possible to absorb the misalignment due to the vibrations of the nozzle and maintain the sealing performance appropriately. Further, since the lip main body LP1 bulges slightly outward in the radial direction, the sealed internal space tends to be widened, and it is possible to effectively cope with a sudden pressure fluctuation in the plug hole HO.

  As described above, according to the present embodiment, a predetermined sealing performance is exhibited regardless of the structure of the upper end surface of the plug hole. Therefore, as long as this ignition coil CL is used, a protrusion is particularly provided on the upper surface of the plug hole. There is no need.

  Although the first embodiment of the present invention has been described above, it is not necessarily limited to the lip shape shown in FIG.

  FIG. 2 shows the rain cover 1 of the second embodiment that ensures a sufficient contact area while being pressed against the engine block. That is, the rain cover 1 is composed of a disk part DSK and a lip part LIP, as in the first embodiment, but the lip part LIP has a lip body part LP1 orthogonal to the disk part DSK, and a lip body part. It is characterized in that it is composed of a lip tip portion LP2 inclined inward from LP1.

  The plate thickness W of the lip body portion LP1 is set to about 50 to 60% of the thickness of the disk portion DSK, and the inclination angle θ between the outer peripheral surface of the lip tip portion LP2 and the upper end surface of the engine block is 25. It is set to about -45 degrees. Here, the inclination angle θ is determined in accordance with the elastic modulus of the material of the rain cover 1, the tightening distance at the time of mounting, etc. In any case, the lip tip portion LP2 of the lip tip portion LP2 is mounted in the mounted state of the ignition coil CL. The outer peripheral surface is configured to form a flat contact surface and to come into strong contact with the upper surface of the engine block.

  Therefore, reliable sealing performance can be exhibited in the second embodiment as well as in the first embodiment.

  FIG. 3A to FIG. 3C illustrate the rain cover 1 of the third embodiment. Each has a lip body portion LP1 orthogonal to the disk portion DSK, and is characterized in that when the ignition coil is mounted, the lip tip portion LP2 is elastically deformed to increase the contact area with the engine block.

  In the rain cover of FIG. 3 (a), two rows of lip body portions LP1a and LP1b are provided, and a lip tip portion LP2 extends only in the outer lip body portion LP1a. The lip tip portion LP2 is configured to be inclined inward, and when the ignition coil is mounted, a large continuous contact area can be secured between the outer surface of the lip tip portion LP2 and the tip surface of the inner lip body portion LP1b. It is like that.

  In addition, the rain cover of FIG. 3B includes an outer lip tip LP2a extending obliquely outward from the lip main body LP1, and an inner lip extending downward continuously from the lip main body LP1. And a tip portion LP2b. The outer lip tip portion LP2a is set slightly longer in the axial direction of the ignition coil than the inner lip tip portion LP2b. Therefore, when the ignition coil is mounted, a large contact area can be secured between the inner surface of the outer lip tip portion LP2a and the tip surface of the inner lip tip portion LP2b.

  On the other hand, in the rain cover of FIG. 3 (c), the outer lip tip portion LP2a extending obliquely outward from the lip main body portion LP1 and the inner side extending obliquely inward from the lip main portion LP1. And a lip tip portion LP2b. In this case, when the ignition coil is mounted, the outer lip tip portion LP2a and the inner lip tip portion LP2b extend outward and inward, thereby securing a large contact area. 1 to 3, the gas passage GS is formed in a double or triple manner, but is not particularly limited.

  As mentioned above, although the Example of this invention was described concretely, the concrete description content does not specifically limit this invention. In particular, the present invention is not limited to a pencil type ignition coil.

It is drawing explaining the ignition coil of a 1st Example. It is drawing explaining the ignition coil of a 2nd Example. It is drawing explaining the ignition coil of a 3rd Example. It is drawing explaining the ignition coil of a prior art example.

Explanation of symbols

HO Plug hole 2 Base end part 3 Protruding part 3a Connection part 1 Elastic seal member CT Central opening DSK Disk part LIP Lip part LP1 Lip body part LP2 Lip tip part

Claims (9)

An ignition coil that includes a primary coil and a secondary coil that are electromagnetically coupled and supplies a high voltage generated in the secondary coil to a spark plug disposed in the plug hole, the base coil exposed from the plug hole An end portion and a substantially cylindrical protruding portion that protrudes from the base end portion and is inserted into the plug hole, and is arranged in a radial direction on the bottom surface of the base end portion or on the base end side of the protrusion portion. An elastic seal member is arranged on the bottom surface of the extended connecting portion to seal the upper surface of the plug hole,
The elastic seal member has a central opening corresponding to the outer diameter of the projecting portion, has a predetermined thickness and spreads in a radial direction, and a peripheral edge of the disc portion toward the upper surface of the plug hole. And a lip portion that extends,
The lip portion has a lip main body portion that is inclined slightly inward in the radial direction with respect to the axial direction of the protruding portion, and a lip tip portion that is bent outward in the radial direction and extends to the lip main body portion. An ignition coil for an internal combustion engine, wherein the lip tip portion forms a flat contact surface with a lower surface extending in a radial direction.   2. The ignition coil according to claim 1, wherein the radial width of the contact surface is set to 1.5 to 2.0 times the thickness of the lip main body.   The ignition coil according to claim 1 or 2, wherein a thickness of the lip main body portion is set to 0.5 to 0.6 times a thickness of the disk portion.   The ignition according to any one of claims 1 to 3, wherein the lip main body portion is configured to be slightly bulged outward in the radial direction in a state where an ignition coil is mounted on the connection portion using a fixture. coil. An ignition coil that includes a primary coil and a secondary coil that are electromagnetically coupled and supplies a high voltage generated in the secondary coil to a spark plug disposed in the plug hole, the base coil exposed from the plug hole An end portion and a substantially cylindrical protruding portion that protrudes from the base end portion and is inserted into the plug hole, and is arranged in a radial direction on the bottom surface of the base end portion or on the base end side of the protrusion portion. An elastic seal member is arranged on the bottom surface of the extended connecting portion to seal the upper surface of the plug hole,
The elastic seal member has a central opening corresponding to the outer diameter of the projecting portion, has a predetermined thickness and spreads in a radial direction, and a peripheral edge of the disc portion toward the upper surface of the plug hole. And a lip portion that extends,
The lip portion has a lip body portion extending in the axial direction of the protruding portion, and a lip tip portion that is bent inward in the radial direction and extends to the lip body portion, and an outer peripheral surface of the lip tip portion Forms an inclined surface of 25 ° to 45 ° with respect to the upper surface of the plug hole,
An ignition coil for an internal combustion engine, characterized in that when the ignition coil is attached to the connecting portion using a fixture, substantially the entire outer peripheral surface is in contact with the upper surface.   The ignition coil according to claim 5, wherein the lip main body portion is configured to be able to slightly bulge radially outward when the ignition coil is mounted. An ignition coil that includes a primary coil and a secondary coil that are electromagnetically coupled and supplies a high voltage generated in the secondary coil to a spark plug disposed in the plug hole, the base coil exposed from the plug hole An end portion and a substantially cylindrical protruding portion that protrudes from the base end portion and is inserted into the plug hole, and is arranged in a radial direction on the bottom surface of the base end portion or on the base end side of the protrusion portion. An elastic seal member is arranged on the bottom surface of the extended connecting portion to seal the upper surface of the plug hole,
The elastic seal member has a central opening corresponding to the outer diameter of the projecting portion, has a predetermined thickness and spreads in a radial direction, and a peripheral edge of the disc portion toward the upper surface of the plug hole. And a lip portion that extends,
The lip portion includes inner and outer lip body portions formed in an inner and outer double extension extending in the axial direction of the projecting portion, and a lip tip bent radially inward and extending to the outer lip body portion. The outer peripheral surface of the lip tip portion forms an inclined surface with respect to the upper surface of the plug hole, and the outer peripheral surface is mounted in a state where an ignition coil is attached to the connecting portion using a fixture. An ignition coil for an internal combustion engine, characterized in that is configured to contact the upper surface. An ignition coil that includes a primary coil and a secondary coil that are electromagnetically coupled and supplies a high voltage generated in the secondary coil to a spark plug disposed in the plug hole, the base coil exposed from the plug hole An end portion and a substantially cylindrical protruding portion that protrudes from the base end portion and is inserted into the plug hole, and is arranged in a radial direction on the bottom surface of the base end portion or on the base end side of the protrusion portion. An elastic seal member is arranged on the bottom surface of the extended connecting portion to seal the upper surface of the plug hole,
The elastic seal member has a central opening corresponding to the outer diameter of the projecting portion, has a predetermined thickness and spreads in a radial direction, and a peripheral edge of the disc portion toward the upper surface of the plug hole. And a lip portion that extends,
The lip portion has a lip main body portion extending in the axial direction of the projecting portion, and a lip tip portion extending from the lip main body portion and branching inward and outward in the radial direction,
An internal combustion engine for an internal combustion engine characterized in that at least an outer side of the branched lip tip is elastically deformed in an extending direction in a state where an ignition coil is attached to the connecting part using a fixture. Ignition coil.   The elastic seal member with which the ignition coil in any one of Claims 1-8 is mounted | worn.

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