JP2576071B2 - Ignition coil device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil device for an internal combustion engine, and more particularly to an ignition coil device in which an ignition coil is arranged on a cylinder head of the internal combustion engine to shorten the distance from an ignition plug. It is about.

[0002]

2. Description of the Related Art A conventional ignition coil device for an internal combustion engine of this type is disclosed in Japanese Utility Model Laid-Open No. 2-115969.

FIG. 6 is a cross-sectional view showing an installation state of an ignition coil device for an internal combustion engine described in this conventional publication.

[0004] As shown in the figure, a support cylinder 51 of the ignition coil device has a joint terminal 52 built in along the axis and is inserted into a plug hole H of an internal combustion engine from above. Lower cap 53 provided at the lower end of support cylinder 51
Is fitted to the ignition plug P in the plug hole H, and
The upper cap 54 provided at the upper end of the support cylinder 51 positions the support cylinder 51 by bringing its outer periphery into contact with the inner circumference of the plug hole H, and the integrally formed flange 55 is connected to the plug on the cylinder head C. Abut around the hole H,
The watertightness inside and outside the plug hole H is maintained. Support tube 51
A coil tower 56 is connected to the upper cap 54, and an ignition coil 57 supported on the coil tower 56 is
Coil terminal 58 in coil tower 56 and support cylinder 5
1 and the ignition plug P through the joint terminal 52 to supply an ignition current to the ignition plug P.

An air vent hole 59 is formed vertically on one side of the flange portion 55 of the upper cap 54, and an air vent groove 60 is formed on the outer periphery of the upper cap 54 corresponding to the air vent hole 59. The inside of the plug hole H and the upper part of the cylinder head C communicate with each other through the air vent hole 59 and the air vent groove 60.
When the support cylinder 51 is inserted into the plug hole H,
When the air in the plug hole H is thermally expanded due to the operation of the internal combustion engine, surplus air is discharged outside through the air vent hole 59 and the air vent groove 60.

By the way, the demand for downsizing of the internal combustion engine has been rapidly increasing in recent years, and accordingly, the space that can be allocated to the ignition coil device has been steadily reduced. In the above-described ignition coil device, since the ignition coil 57 supported on the coil tower 56 protrudes largely upward, it is impossible to further reduce the installation space, and further saves space. As a public technical bulletin issued by Nippon Denso Co., Ltd., issued on January 15, 1990,
The one described in reference number 69-198 has been proposed.

FIG. 7 is a cross-sectional view showing an installation state of an ignition coil device for an internal combustion engine described in the related art.

As shown in the figure, this ignition coil device
By fixing the ignition coil 71 directly on the cylinder head C of the internal combustion engine, the height of the protrusion upward is reduced to save space. A fitting portion 72 protrudes from the lower surface of the ignition coil 71 so as to face the plug hole H. A rubber packing 73 is fitted over the fitting portion 72 so that the holder 74 can be detached downward. Has been prevented. Packing 73
Is held down from above by the lower surface of the ignition coil 71, and its outer periphery is brought into close contact with the inner periphery of the plug hole H to maintain watertightness inside and outside the plug hole H. One side of the ignition coil 71 and the packing 73 is provided with air vent holes 75 and 76 corresponding to each other.
Are formed vertically, and the inside of the plug hole H and the upper part of the cylinder head C communicate with each other through the air vent holes 75 and 76,
As in the case of the above-described ignition coil device, excess air in the plug hole H is appropriately discharged to the outside.

The outer periphery of the fitting portion 72 and the packing 73
Are formed in a rectangular cross section corresponding to each other, and the fitting portion 7 is formed only when the air vent holes 75 and 76 are aligned.
The packing 73 can be fitted to the outside of the casing 2, and as a result, care is taken to prevent the occurrence of assembly failure due to the mismatch between the air vent holes 75 and 76. In this ignition coil device, a high-pressure tower 77 projecting downward from a fitting portion 72 of the ignition coil 71 is directly connected to the ignition plug P via a plug cap 78.

On the other hand, apart from the above two types of ignition coil devices, there is proposed an ignition coil device shown in FIG. 8 as a type in which the ignition coil is directly fixed on the cylinder head C.

FIG. 8 is a sectional view showing an installation state of the conventional ignition coil device for an internal combustion engine. As shown in the figure, an upper part of a rubber high-pressure joint 83 is fitted on a high-pressure tower 82 projecting from the lower surface of the ignition coil 81, and a joint terminal built in the high-pressure joint 83 along the axis. 84 is the ignition coil 81 and the plug hole H
Are electrically connected to a spark plug (not shown). At the upper end of the high-pressure joint 83, a seal flange 85 is integrally formed,
An annular outer seal lip 86 formed on the outer periphery of the lower surface of the seal flange 85 abuts on the cylinder head C, and extends downward on the inner periphery of the lower surface of the seal flange 85. The seal lip 87 abuts on the inner periphery of the plug hole H, and the seal lips 86 and 87 maintain watertightness inside and outside the plug hole H.

Here, compared with the outer peripheral side seal lip 86 which merely abuts on the cylinder head C to maintain watertightness, the inner peripheral side seal lip 87 is elastically deformed while the plug hole H of the high pressure joint 83 is formed. Greater flexibility is required because it is necessary to allow insertion / removal into the interior. Therefore, in this ignition coil device, sufficient flexibility is imparted by forming a gap 88 in the inner periphery of the inner peripheral side seal lip 83, and the high-pressure joint 83 is inserted with a small operating force.
It is designed to be detachable.

The above-mentioned ignition coil device is intended for an internal combustion engine having a relatively large-diameter plug hole H which has a room for forming a gap 88 in the inner periphery of the inner peripheral side seal lip 87. For example, in a DOHC type internal combustion engine in which the valve scissor angle is narrowed, the diameter of the plug hole H is required to be small, so that there is no room for forming the gap 88. Therefore,
For example, an ignition coil device shown in FIG. 9 has been proposed for an internal combustion engine having such a small-diameter plug hole H.

FIG. 9 is a sectional view showing an installation state of another conventional ignition coil device for an internal combustion engine.

As shown in the drawing, this ignition coil device
Instead of the above-described inner peripheral side seal lip 87, a seal lip 91 is formed so as to protrude from the entire outer periphery of the high-pressure joint 83, and insertion and detachment of the high-pressure joint 83 are performed while compressively deforming the seal lip 91 in the radial direction. It is.

[0016]

In the conventional ignition coil device described in the published technical report shown in FIG. 7, both the outer periphery of the fitting portion 72 of the ignition coil 71 and the inner periphery of the packing 73 have a rectangular cross section. By forming it in a shape, the packing 7
When fitting 3 outside, it is prevented that both air vent holes 75 and 76 do not match, resulting in an assembly failure. However, by taking this measure, it is necessary to adjust the angle of the packing 73 with respect to the fitting portion 72 at the time of assembling, which has been a factor of complicating the assembling work. In addition, both the ignition coil device described in this published technical report and the ignition coil device described in the publication shown in FIG. At the time of receiving water, the water is immersed in the plug hole H through the air vent holes 59 and 75, and the high-voltage coupling portion between the support cylinder 51 and the high-pressure tower 77 and the ignition plug P is insulated and ignition failure occurs. Could be.

[0017]

On the other hand, in the ignition coil device for the small-diameter plug hole H shown in FIG. 9, the high-pressure joint 83 is inserted into and removed from the plug hole H by compressing and deforming the seal lip 91 in the radial direction as described above. Is tolerated. However, since the seal lip 91 is a solid body and the flexibility is not enhanced by utilizing the gap 88 as in the inner peripheral side seal lip 87 shown in FIG. 8, it is difficult to compress and deform.
Therefore, if the outer diameter of the seal lip 91 is set to be large and the inner circumference of the plug hole H is strongly pressed in order to ensure the sealing performance against the plug hole H, the high pressure joint 8
A considerable amount of operating force is required when inserting / removing the 3 and there is a possibility that the maintainability of the internal combustion engine may be reduced.

Such a problem is caused by the seal lip 9
Not limited to 1, but also occurs, for example, when the support cylinder 51 is positioned in the plug hole H around the outer periphery of the upper cap 54 as in the ignition coil device shown in FIG. That is, if the outer diameter of the upper cap 54 is set large and strongly pressed against the inner periphery of the plug hole H in order to secure the positioning of the support cylinder 51 with respect to the plug hole H, the A considerable amount of operating force is required when inserting and removing the device.

The present invention has been made in view of the above-mentioned problems of the prior art.
Air passage communicating between the inside and outside of the plug hole.
Assembling of the seal part by making sure that it communicates while
Adjustment operation to increase the degree of freedom in direction and match the air passage
The purpose is to simplify the assembly work as unnecessary
You. Further, the present invention provides a combination of an ignition coil and a high-pressure joint.
Adjustment to increase the degree of freedom in the mounting direction and match the air passage
Aims to simplify assembly work by eliminating operation
And Also, the present invention provides an ignition coil and a high-pressure joint.
The degree of freedom in the assembly direction of the air and match the air passage
Adjustment is not required to facilitate assembly work
In addition, prevent water from entering the plug hole from the air passage.
aimed to. The present invention also provides an ignition coil and a high-pressure jog.
Increase the degree of freedom in the assembly direction with the
Simplifies assembly work by eliminating the need for adjustment operations
And even if the plug hole has a small diameter,
Controllability and positioning, and with a light operating force
Insertion / removal operation can be performed, and thus the internal combustion engine
Coil of an internal combustion engine that can improve the maintainability of the engine
It is an object of the present invention to provide a control device.

[0021]

According to the first aspect of the present invention,
In order to achieve the above object, a cylinder head of an internal combustion engine is provided.
It is mounted on the top and conducts with the spark plug in the plug hole
An ignition coil device for an internal combustion engine,
Has insulation properties with the pressure contact part located outside the upper opening of the
Made of an elastic material that is
Is provided rotatably, and the cylinder head
It is interposed between the periphery of the opening of the plug hole and the pressure contact part.
A seal portion, and the press contact portion includes the seal portion and
Coil side that connects the contact surface and the outside of the plug hole
A passage is formed, and the seal portion is in contact with the pressure contact portion.
Seal-side passage communicating the surface to be sealed with the inside of the plug hole
Is formed, and the contact between the press contact portion and the seal portion is further increased.
On the surface, an angle permissible groove having a predetermined radius around the axis is provided.
The coil side passage and the seal side passage are formed
The technical means that they are communicated through the angle tolerance groove
adopt.

According to the second aspect of the present invention, the above object is achieved.
For this purpose, a plug formed in the cylinder head of the internal combustion engine
Inside the plug hole to be fixed to the opening of the hole
Ignition coil with a high-pressure tower protruding toward
And a plug hole made of an elastic material having an insulating property.
The ignition coil is inserted and arranged in the
To be rotatable around the shaft center
Connect the inner end to the spark plug in the plug hole
Ignition coil with joint terminal built in along the heart
A high-pressure joint for conducting the spark plug and the spark plug;
The cylinder head is formed integrally with the outer end of the joint.
Between the ignition coil and the ignition coil.
The pressed surface is pressed against the cylinder head with the formed pressure surface.
And a sealing flange abutting around the plug hole.
Centering on the axis of the pressed surface of the seal flange
An opening is formed on a predetermined radius to communicate with the inside of the plug hole.
A joint-side air vent passage through which
And the center of the axis of the pressure contact surface of the ignition coil is
One end communicates with the predetermined radius and the other end
A coil-side air vent passage communicating with the outside of the hole;
Either the pressure contact surface of the seal or the pressure contact surface of the seal flange
On the other hand, an angle formed at the predetermined radius around the axis is
And a technical means of providing a degree-permissible groove. Claim
In the invention described in Item 3, in order to achieve the above object, the invention
3. The configuration according to claim 2, wherein the coil-side air vent passage is
A shielding member is provided just above the end outside the plug hole.
Employ the technical means that they are Claim 4
According to the present invention, in order to achieve the above-mentioned object, the present invention relates to claim 2 or claim 3.
The high pressure tower of the high pressure joint according to any of the preceding claims.
On the outer periphery near the outer end that fits outside, and on the inner periphery of the plug hole.
An abutting portion that abuts with elasticity is projected, and the high-pressure joy
On the inner circumference of the plant and / or the outer circumference of the high pressure tower.
Escape part is provided corresponding to the contact part to form a deformation allowable space.
Adopt the technical means that

[0023]

According to the first aspect of the present invention, the plug hole
The pressure contact part located outside the upper opening and on the cylinder head
A seal portion is interposed between the plug hole and the periphery of the opening of the plug hole.
To prevent water from entering the plug hole.
You. Moreover, the inside of the plug hole and the outside
Communication through the shaft side passage, the angle allowable groove and the coil side passage
Is done. Here, the angle allowable groove is formed between the pressure contact portion and the seal portion.
A predetermined radius centered on the mounting axis of the seal on the contact surface
The seal is formed around the axis.
Even if it rotates, the communication between the seal side passage and the coil side passage is maintained.
Be held.

According to the second aspect of the present invention, the ignition coil
When fitting the outside of the high-pressure joint to the high-pressure tower
The air bleed passage on the contact side matches the air bleed passage on the coil side.
Even if not, both air passages must be
The ignition coil and the high-pressure
The direction of assembly with the
The adjustment operation for matching the passages is not required. Further claims
According to the invention described in the third aspect, the opening of the coil-side air vent passage
Is shielded from above by the shielding member, so the cylinder head
Even if the ground is wet, the coil side air vent passage for rainwater etc.
There is very little chance of infiltrating into. Claim 4
According to the invention of the invention, the inner peripheral side of the high-pressure joint and the high-pressure tower
High pressure join, because only a relief is formed on the outer peripheral side of
There is almost no need to increase the outer diameter of the
Outer diameter reduced enough to insert into holes
It is possible. And to the plug hole of the high pressure joint
The contact part changes the deformation allowable space on the inner peripheral side when inserting or removing
Since it is compressed and deformed in the radial direction while
The resistance at the time of sliding contact on the inner circumference of the tool is reduced.

[0025]

【Example】

 <First Embodiment> A first embodiment of the present invention will be described below.

FIG. 1 is a sectional view showing an installation state of an ignition coil device for an internal combustion engine according to a first embodiment of the present invention, and FIG. 2 is an ignition coil of an ignition coil device for an internal combustion engine according to the first embodiment of the present invention. FIG. 3 is an exploded perspective view of a high-pressure joint and a high-pressure joint. FIG. 3 is a sectional view taken along the line XX of FIG.

As shown in the figure, the ignition coil 1 of the ignition coil device is made of synthetic resin, and has a main body 2 as a shielding member having an upper rectangular box shape, a lower disc-shaped holding plate 3 and a main body 2 having a lower disk shape. A connecting portion 4 connects the holding plate 3 and the holding plate 3, and a cylindrical high-pressure tower 5 protruding downward at the center of the lower surface of the holding plate 3. A pair of mounting portions 6 protrude from the side surface of the main body 2, and the ignition coil 1 is fixed on a cylinder head C of the internal combustion engine via bolts (not shown) via these mounting portions 6. It faces a plug hole H formed in the head C. A rubber high-pressure joint 7 extending up and down is inserted and arranged in the plug hole H. An upper cap 8 integrally formed on the upper end of the high-pressure joint 7 elastically fits over the high-pressure tower 5 of the ignition coil 1. , Lower cap 9 integrally formed at the lower end
Is the ignition plug P installed at the bottom in the plug hole H
Is elastically fitted to the outside.

A joint terminal 10 is built in the high-pressure joint 7 along the axis. The upper end of the joint terminal 10 is connected to a connection terminal 5 a in the high-pressure tower 5, and the lower end of the joint terminal 10 is connected to a terminal spring 1.
1 is connected to the terminal P1 of the ignition plug P.
A coil (not shown) wound around the core 12 in the main body 2 of the ignition coil 1 conducts with the ignition plug P via the joint terminal 10 and supplies an ignition current to the ignition plug P. The high-pressure tower 5, high-pressure joint 7, and spark plug P of the ignition coil 1 are located on the same axis L, and the upper cap 8 and the lower cap 9
Are externally fitted to the high-pressure tower 5 and the spark plug P so as to be freely assembled around the axis L. That is,
The high-pressure joint 7 can be installed at any angle around the axis L.

At the open end of the upper cap 8 of the high-pressure joint 7, a disk-shaped sealing flange 13 is integrally formed. The sealing flange 13 is interposed between the cylinder head C and the holding plate 3 of the ignition coil 1. I have. The press-contact surface 3a of the lower surface of the pressing plate 3 is pressed against the press-contact surface 13a of the upper surface of the seal flange 13 from above, and as a result, an annular seal lip 13b formed on the outer peripheral edge of the lower surface of the seal flange 13 is attached to the cylinder head C. It contacts the periphery of the upper plug hole H to maintain watertightness inside and outside the plug hole H.

On the radius r from the axis L of the seal flange 13, a small-diameter joint-side air vent hole 14 is vertically penetrated, and similarly, on the radius r from the axis L of the holding plate 3 of the ignition coil 1. The coil-side air vent 15 having the same diameter as the joint-side air vent 14 is provided vertically. Also,
An annular angle-permissible groove 16 having a radius r around the axis L is formed on the press-contact surface 3a of the holding plate 3.
Communicates with the coil side air vent hole 15. Here, as described above, since the joint-side air vent hole 14 is also located at the radius r from the axis L, the angle tolerance is set regardless of the assembly angle of the high-pressure joint 7 with respect to the high-pressure tower 5 about the axis L. The groove 16 always corresponds to the joint side air vent hole 14.

On the side surface of the connecting portion 4 of the ignition coil 1,
A rib 17 having a rectangular cross section for connecting the main body 2 and the holding plate 3
A rectangular communication window 18 is formed in the upper portion of one side surface of the rib portion 17 adjacent to the lower surface of the main body 2 and the side surface of the connecting portion 4. Here, the portions surrounding the two side surfaces in the communication window 18 in the rib portion 17 are respectively defined by the shielding walls 1.
7a and 17b. The coil-side air vent hole 15 extends upward in the rib portion 17 from the holding plate 3 side, opens into the communication window 18, and opens toward the outside through the communication window 18. The opening of the coil-side air vent hole 15 in the communication window 18 is shielded from above by the main body 2 and is closed by the connecting portion 4 and the shielding walls 17a and 17b.
It is shielded from the side.

On the other hand, on the outer periphery of the upper cap 8 of the high-pressure joint 7, a positioning ridge 19 as a contact portion is formed so as to surround the entire periphery, and the outer periphery of the positioning ridge 19 is self-elastic. The high pressure joint 7 is positioned at the center of the plug hole H by being pressed against the inner periphery of the plug hole H. One side of the positioning ridge 19 is formed with an air vent groove 20 for communicating vertically in the plug hole H, and the lower part in the plug hole H is formed with the air vent groove 20, the joint side air vent hole 14, It communicates with the upper part of the cylinder head C through the allowable groove 16, the coil-side air vent hole 15, and the communication window 18, so that the air in the plug hole H can be discharged.

In the inner periphery of the upper cap 8, at a height corresponding to the positioning ridge 19, an annular escape groove 21 as an escape portion is provided so as to surround the high-pressure tower 5 of the ignition coil 1.
The relief groove 21 forms a deformable space 22 having a semicircular cross section on the outer periphery of the high-pressure tower 5.
When the positioning ridge 19 is compressed and deformed in the radial direction when the positioning ridge 19 is inserted into the plug hole H, the deformation permissible space 22 is deformed accordingly, thereby allowing the positioning ridge 19 to be compressed and deformed. . That is, the positioning protrusion 19 is given sufficient flexibility by the action of the deformation allowable space 22. Here, as is apparent from FIG. 1, the upper cap 8 of the high-pressure joint 7 has only the relief groove 21 formed on the inner periphery,
There is almost no need to increase the outer diameter, and the outer diameter can be reduced to such an extent that it can be sufficiently inserted even into a small-diameter plug hole H.

The above-mentioned relief groove 21 is an undercut in terms of molding, but is formed by so-called forcible removal in which the product is forcibly pulled out of the molding die after vulcanization molding of the upper cap 8.

Next, a procedure for mounting the ignition coil device configured as described above on an internal combustion engine will be described.

Prior to the mounting operation, first, the upper cap 8 of the high-pressure joint 7 is externally fitted to the high-pressure tower 5 of the ignition coil 1 in order to connect the ignition coil 1 and the high-pressure joint 7.
Accordingly, the high-pressure tower 5 is held inside by the elastic force of the upper cap 8, and the joint terminal 10 of the high-pressure joint 7 is connected to the connection terminal 5a in the high-pressure tower 5.
And both members 1 and 7 are combined. At this time, the pressure contact surface 13 of the seal flange 13 of the high pressure joint 7
a is in contact with the pressing surface 3a of the holding plate 3 of the ignition coil 1,
The joint side air vent hole 14 is made to correspond to the angle allowable groove 16 on the press contact surface 3a side. Here, the upper cap 8 of the high-pressure joint 7 is fitted around the high-pressure tower 5 of the ignition coil 1 so that the upper cap 8 can be freely assembled around the axis L. In many cases, the phases of the coil-side air vents 15 do not match, but even in such a case, the joint-side air vents 14 are not provided with the angle-allowing grooves 16.
Through the coil-side air vent hole 15 through the hole. That is, when the high-pressure joint 7 is connected to the ignition coil 1, there is no need to perform an adjusting operation for matching the air vent holes 14 and 15, and the upper cap 8 of the high-pressure joint 7 for the high-pressure tower 5 of the ignition coil 1 is not required. Can be combined without considering the angle of assembly.

Next, while holding the combined ignition coil 1 and high pressure joint 7, the high pressure joint 7 is inserted into the plug hole H of the internal combustion engine. Therefore, the lower cap 9 of the high-pressure joint 7 is externally fitted to the ignition plug P, the internal terminal spring 11 is connected to the terminal P1 of the ignition plug P, and the ignition plug P is connected to the ignition coil 1 through the joint terminal 10. Conducted with the coil. Further, the outer periphery of the positioning protrusion 19 of the high-pressure joint 7 is pressed against the inner periphery of the plug hole H by its own elasticity, and the high-pressure joint 7 is positioned at the center in the plug hole H.

The positioning ridge 19 when it is inserted into the plug hole H is compressed and deformed in the radial direction while deforming the deformable space 22 on the inner peripheral side. Gives sufficient flexibility. Accordingly, the resistance when the positioning ridge 19 slides on the inner periphery of the plug hole H is extremely small, and the high-pressure joint 7 can be inserted with a small operating force. Conversely, when the high-pressure joint 7 is detached from the plug hole H, the positioning protrusions 19 are also required.
Since the sliding contact resistance is small, it can be executed with a light operating force.

Thereafter, the mounting portion 6 of the main body 2 of the ignition coil 1
Is fixed on the cylinder head C with bolts, the press contact surface 3a of the ignition coil 1 presses against the press contact surface 13a of the seal flange 13 of the high pressure joint 7 from above, and the seal flange 13
Abuts around the plug hole H on the cylinder head C. As a result, watertightness inside and outside the plug hole H is maintained by the seal lip 13b, and the mounting operation of the ignition coil device is completed.

The plug hole H of the high-pressure joint 7
The excess air in the plug hole H is removed by the air vent groove 20, the joint-side air vent hole 14,
6. Since the air is discharged above the cylinder head C through the coil side air vent hole 15 and the communication window 18, the plug hole H
There is no possibility that the air will be compressed in the inside and hinder the insertion operation of the high-pressure joint 7. Also, after mounting the ignition coil device,
Even when the air in the plug hole H thermally expands with the operation of the internal combustion engine, the excess air is discharged above the cylinder head C, so that the internal pressure of the plug hole H increases and various types of ignition coil devices are provided. There is no danger of adverse effects.

On the other hand, when the vehicle is running on rainy weather or the like, there is a case where the water above the cylinder head C is wetted by rainwater that has entered the engine room. Here, in the ignition coil device of the present embodiment, the opening of the coil-side air vent hole 15 in the communication window 18 is shielded from above by the main body 2 of the ignition coil 1, and the connecting portion 4 and the shielding walls 17a, 17b are provided. , And there is almost no possibility that rainwater or the like will enter the coil-side air vent hole 15 even if it is wet from any direction. Since the water can be prevented except in the opening direction of the communication window 18 as described above, it is desirable to install the ignition coil device so that the communication window 18 is oriented in a direction in which the possibility of the water being wetted is least. .

As described above, the ignition coil device for the internal combustion engine of the first embodiment is fixed to the opening of the plug hole H formed in the cylinder head C of the internal combustion engine. And an upper cap 8 which is inserted and arranged in the plug hole H so that the upper cap 8 can be freely attached to the high-pressure tower 5 of the ignition coil 1 around an axis L. At the same time, the lower cap 9 is connected to the ignition plug P in the plug hole H,
A rubber high-pressure joint 7 for conducting the ignition coil 1 and the ignition plug P at a joint terminal 10 built in along the axis L, and an upper cap 8 of the high-pressure joint 7
And is interposed between the cylinder head C and the ignition coil 1. The pressure contact surface 3a formed on the holding plate 3 of the ignition coil 1 presses the contact surface 13a against the cylinder head C side. And a seal flange 13 for bringing the seal lip 13b into contact with the periphery of the plug hole H;
And a joint-side air vent hole 14 vertically provided on a radius r about the axis L of the ignition coil 3, and vertically extending on a radius r about the axis L of the holding plate 3 of the ignition coil 1. Being
A coil-side air vent hole 15 that opens into a communication window 18 formed in the ignition coil 1; and an angle-allowing groove 16 formed in the press-contact surface 3a of the ignition coil 1 in an annular shape with a radius r around the axis L. The body 2 of the ignition coil 1, the connecting portion 4, and the shielding walls 17 a, 17 b are located immediately above and three sides of the opening of the coil-side air vent 15 in the communication window 18. This configuration corresponds to the first aspect of the present invention.

Therefore, the high-pressure tower 5 of the ignition coil 1
When externally fitting the upper cap 8 of the high-pressure joint 7 to
Even if the joint-side air vent hole 14 and the coil-side air vent hole 15 do not match, the two air vent holes 14 and 15 surely communicate with each other via the angle allowable groove 16 formed on the same radius r. Therefore, the direction of assembly of the ignition coil 1 and the high-pressure joint 7 is eliminated, so that an adjustment operation for matching the air vent holes 14 and 15 is not required, and the assembly operation can be facilitated.

Further, the opening of the coil-side air vent hole 15 is shielded from above by the main body 2 of the ignition coil 1 and is shielded from three sides by the connecting portion 4 and the shielding walls 17a and 17b. Even when the head C gets wet,
There is almost no possibility that rainwater or the like enters the coil side air vent hole 15. Therefore, it is possible to prevent the ignition failure of the ignition plug P due to the infiltration into the plug hole H, thereby improving the reliability of the internal combustion engine.

On the other hand, in the ignition coil device of the internal combustion engine of the first embodiment, a positioning ridge 19 is formed on the outer peripheral side of the upper cap 8 of the high-pressure joint 7 so as to elastically contact the inner periphery of the plug hole H. At the same time, an annular relief groove 21 is formed on the inner peripheral side of the upper cap 8 so as to form a deformable space 22 having a semicircular cross section in correspondence with the positioning ridge 19.
This configuration corresponds to the second aspect of the present invention.

Therefore, since the escape groove 21 is only formed on the inner periphery of the upper cap 8, there is almost no need to increase the outer diameter, and the outer diameter is small enough to be inserted into the small-diameter plug hole H. The diameter can be reduced. When the high-pressure joint 7 is inserted into or detached from the plug hole H, the positioning ridge 19 is moved to the deformation allowable space 22 on the inner peripheral side.
Is deformed in the radial direction while deforming, so that the resistance at the time of sliding the inner periphery of the plug hole H becomes extremely small.

Therefore, even if the diameter of the plug hole H is small, it is possible to perform the insertion / removal operation with a light operating force while sufficiently securing the positioning of the high-pressure joint 7 by the positioning ridge 19. As a result, the maintainability of the internal combustion engine can be improved.

<Second Embodiment> A second embodiment of the present invention will be described below.

FIG. 4 is a sectional view showing an installed state of an ignition coil device for an internal combustion engine according to a second embodiment of the present invention, and FIG. 5 is an ignition coil of an ignition coil device for an internal combustion engine according to the second embodiment of the present invention. FIG. 4 is an exploded perspective view of a high pressure joint. The overall configuration of the ignition coil device of the present embodiment is the same as that of the above-described ignition coil device of the first embodiment, except for the relationship between the joint-side air vent hole 31 and the angle allowable groove 32 and the deformation. Because of the structure of the permissible space 36, differences will be mainly described.

As shown in the drawing, in the ignition coil device of the present embodiment, a pair of joint side air vent holes 31 penetrate 180 degrees from the axis L of the seal flange 13 of the high pressure joint 7 at a radius r. Have been. An arc-shaped angle permissible groove 32 having a radius r is formed on the press-contact surface 3a of the ignition coil 1 over a region of 180 degrees around the axis L, and the angle permissible groove 32 is the same as in the first embodiment. In addition, it communicates with one coil side air vent hole 33 formed in the holding plate 3. Therefore, the angle-allowing groove 32 always corresponds to one of the joint-side air vent holes 31 irrespective of the assembling angle about the axis L of the high-pressure joint 7 with respect to the high-pressure tower 5.

On the other hand, a step 34 is formed on the inner periphery of the upper cap 8 of the high-pressure joint 7 at a height corresponding to the lower edge of the positioning ridge 19 on the outer periphery. It has a large diameter. A step 35 is formed on the outer periphery of the high-pressure tower 5 of the ignition coil 1 at a height corresponding to the upper edge of the positioning ridge 19 when the high-pressure joint 7 is assembled. Has a smaller diameter. Therefore, a deformation allowable space 36 having a substantially rectangular cross section is formed corresponding to the height of the positioning ridge 19 due to the difference between the upper and lower positions of the two step portions 34 and 35. In the present embodiment, a relief portion is formed by the two step portions 34 and 35.

As is apparent from the figure, since these steps 34 and 35 do not become undercuts when the high-pressure joint 7 and the high-pressure tower 5 are formed, they are not forcibly removed as in the first embodiment. The deformation allowable space 36 can be formed.

As described above, the ignition coil device of the present embodiment is configured, so that the upper cap 8 of the high-pressure joint 7 is externally fitted to the high-pressure tower 5 of the ignition coil 1 as in the first embodiment. Even if the joint side air vent hole 31 and the coil side air vent hole 33 do not match, both air vent holes 31,
33 communicates reliably via the angle-allowing groove 32 formed on the same radius r. Therefore, the direction of assembly between the ignition coil 1 and the high-pressure joint 7 is eliminated, and both air vent holes 3 are formed.
This eliminates the need for an adjustment operation for matching the positions 1 and 33, thereby facilitating the assembling work.

Further, since only the step portions 34 and 35 are formed on the inner periphery of the upper cap 8 and the outer periphery of the high-pressure tower 5, the outer diameter can be reduced to such an extent that the small-diameter plug hole H can be sufficiently inserted. When the high-pressure joint 7 is inserted into or removed from the plug hole H, the positioning ridge 19 is radially compressed and deformed while deforming the deformation-permitting space 36 on the inner peripheral side. The resistance when sliding the inner periphery of the hole H is extremely small. Therefore, even if the plug hole H has a small diameter, it is possible to perform the insertion / removal operation with a light operating force while sufficiently securing the positioning of the high-pressure joint 7 by the positioning ridge 19. The maintainability of the internal combustion engine can be improved.

The angle allowable groove of the first embodiment is formed as an annular angle allowable groove 16 formed on the press-contact surface 3a of the ignition coil 1. The angle allowable groove of the second embodiment is a 180-degree circular. Although it is configured as an arc-shaped angle-allowing groove 32, the present invention is not limited to this, and is not limited to this, regardless of the mounting angle of the high-pressure joint 7 with respect to the high-pressure tower 5. Air vent hole 1
What is necessary is just to be able to make the 4, 4 and 31 and the coil side air vent holes 15 and 33 communicate. So, for example,
These angle-allowing grooves 16 and 32 may be formed on the pressure-contact surface 13 a of the seal flange 13 on the high-pressure joint 7 side. In addition, as for the formation length, in addition to the annular shape and the 180-degree arc shape, for example, it may be formed in a 90-degree arc shape, and the corresponding air vent holes may be formed in four places at 90-degree intervals. Even in this case, the joint-side air vent and the coil-side air vent can always be communicated via the angle-allowing groove.

The contact portions of the first and second embodiments are formed as positioning protrusions 19 for positioning the high-pressure joint 7 in the plug hole H. However, the present invention is not limited to this, but is formed on the outer periphery of the high-pressure joint 7 and elastically presses against the inner periphery of the plug hole H to insert / remove the high-pressure joint 7 into / from the plug hole H. The purpose is not limited as long as flexibility is required at that time. Therefore, for example, as in the ignition coil device shown in FIG. 9 described in the related art, a seal lip is formed so as to protrude from the entire outer periphery of the high-pressure joint 7, and the relief groove 21 is provided on the inner peripheral side of the seal lip. Alternatively, the deformation allowable spaces 22 and 36 may be formed by the step portions 34 and 35 to ensure the flexibility of the seal lip.

Further, the relief portion of the first embodiment is formed by a relief groove 2 formed on the inner periphery of the upper cap 8 of the high-pressure joint 7.
1 and the relief portion of the second embodiment is configured as a step portion 34 formed on the inner periphery of the upper cap 8 and a step portion 35 formed on the outer periphery of the high-pressure tower 5,
When the present invention is implemented, the present invention is not limited to this, and flexibility is imparted to the contact portions such as the positioning ridge 19 and the seal lip formed on the outer peripheral side of the upper cap 8 of the high-pressure joint 7. Whatever is possible is possible. Therefore, for example, it may be configured as a relief groove formed on the outer periphery of the high-pressure tower 5.

In the embodiment described above, the ignition coil
The holding plate 3 of the screw 1 is located outside the upper opening of the plug hole
The seal flange 13 is configured as
It is configured as a control unit.

【The invention's effect】 As described above, the invention of claim 1
According to the above, even if the seal is rotated about the axis,
The communication between the coil side passage and the coil side passage is maintained, and the plug
Communication inside and outside the hall is maintained. In this way, the seal
The degree of freedom in the mounting direction is increased, and the air passages
Simplifies assembly work by eliminating the need for adjustment operations
Can be. An ignition coil for an internal combustion engine according to the invention of claim 2.
The device is installed outside the high pressure joint on the high pressure tower of the ignition coil.
When fitting the end to the outside, remove the air from the joint side and the coil side.
Both air passages have the same radius even if the air vent passage does not match
Is reliably communicated through the angle-allowing groove formed in the groove. late
The direction of assembly between the ignition coil and the high-pressure joint is eliminated
No adjustment operation is needed to match both air vent passages
And the assembling work can be facilitated. Claim 3
According to the described invention, in addition to the effect of the invention of claim 2,
And the opening of the coil side air vent passage is upward with the shielding member
When the cylinder head gets wet due to more shielding
However, there is no possibility
rare. Therefore, due to flooding in the plug hole
Prevents ignition failure of the spark plug, and thus the internal combustion engine
The reliability of Seki can be improved.

An ignition coil for an internal combustion engine according to a fourth aspect of the present invention.
Is installed on the inner periphery of the high-pressure joint and the outer periphery of the high-pressure tower.
Small-diameter plug hole because only a relief is formed on the side
Outside the high-pressure joint so that it can be inserted
The diameter can be reduced. And the plug of the high pressure joint
The abutment part can be deformed on the inner peripheral side when inserting or removing from the hole.
Because it is compressed and deformed in the radial direction while deforming the container space,
Resistance when sliding the inner periphery of the plug hole is reduced.
Therefore, even if the plug hole has a small diameter,
Inserting with a light operating force after ensuring sealing and positioning
Operation can be performed.
Maintainability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an installation state of an ignition coil device for an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of an ignition coil and a high-pressure joint of the ignition coil device for the internal combustion engine according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line XX of FIG. 1 showing a coil-side air vent hole of the ignition coil device for the internal combustion engine according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing an installation state of an ignition coil device for an internal combustion engine according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of an ignition coil and a high-pressure joint of an ignition coil device for an internal combustion engine according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing an installed state of an ignition coil device for an internal combustion engine described in a conventional publication.

FIG. 7 is a cross-sectional view showing an installed state of an ignition coil device for an internal combustion engine described in a conventional published technical report.

FIG. 8 is a sectional view showing an installation state of a conventional ignition coil device for an internal combustion engine.

FIG. 9 is a sectional view showing an installation state of another conventional ignition coil device for an internal combustion engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ignition coil 2 Main body (shielding member) 3a Pressure contact surface 5 High pressure tower 7 High pressure joint 13 Seal flange 13a Pressure contact surface 14, 31 Joint side air vent 15, 33 Coil side air vent 16, 32 Angle permissible groove 19 Positioning ridge (Abutment part) 21 Escape groove (Escape part) 22, 36 Deformation allowable space 34, 35 Step part (Escape part) C Cylinder head H Plug hole P Spark plug

Claims (4)

(57) [Claims] Claims: 1. An engine mounted on a cylinder head of an internal combustion engine.
Of the internal combustion engine that communicates with the spark plug in the plug hole
In the ignition coil device, a pressure contact portion located outside an upper opening of the plug hole
And an elastic material having an insulating property,
It is provided rotatable about the axis, and
Between the periphery of the opening of the plug hole on the pad and the pressure contact portion.
A seal portion interposed therebetween, and the press contact portion has a surface in contact with the seal portion and the plastic portion.
A coil-side passage communicating with the outside of the hole is formed, and the seal portion has a surface in contact with the press contact portion and the plug.
A seal-side passage communicating with the inside of the through hole is formed, and a contact surface between the press contact portion and the seal portion is provided with the seal passage.
An angle-allowing groove having a predetermined radius around the axis is formed,
The coil side passage and the seal side passage define the angle allowable groove.
Ignition of an internal combustion engine characterized in that it is in communication with
Coil device. 2. A fixed to an opening portion of the plug hole formed in a cylinder head of an internal combustion engine Rubeku, an ignition coil that protrudes form the high voltage tower as buy directed in the plug hole, an elastic material having an insulating property The outer end is rotatably fitted around the axis with respect to the high-pressure tower of the ignition coil, and the inner end is connected to the ignition plug in the plug hole. , a high pressure joints for conducting the ignition coil spark plug joint terminal having a built-in along the axis, are integrally formed on the outer end of the high pressure joint, is interposed between said ignition coil and on the cylinder head A sealing flange formed by pressing a surface to be pressed against the cylinder head side with a pressing surface formed on the ignition coil and abutting around the plug hole; Is opened and formed on a predetermined radius about the axis of the pressed surface of the joint side air disconnect passage communicating with the said plug hole, provided in the ignition coil, the axis of the pressing surface of said ignition coil One end communicates with the predetermined radius centered on
And a coil side air disconnect passage and the other end communicates with outside the plug hole, to either the contact face or the contact face of the sealing flange of the ignition coil, formed on the predetermined radius about the axis ignition coil device for an internal combustion engine, characterized in that it comprises a angular allowing groove. 3. The plug hose of the coil side air vent passage.
A shielding member is provided just above the outer edge of the tool.
3. The ignition coil for an internal combustion engine according to claim 2, wherein
apparatus. 4. An external fitting to a high-pressure tower of the high-pressure joint.
On the outer circumference near the outer end to provide elasticity on the inner circumference of the plug hole.
The contact portion that comes into contact with the
The abutting portion is provided on the inner peripheral side and / or the outer peripheral side of the high-pressure tower.
A relief part that forms a deformation allowable space corresponding to
The ignition core according to claim 2 or 3, wherein:
Device.