JP2009052453A - Attachment structure of ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment structure of an ignition coil for internal combustion engine that can perform smooth positioning in circumferential direction of the ignition coil for internal combustion engine and an engine, and can reliably and firmly prevent the immersion of liquid into the internal combustion engine. <P>SOLUTION: A male thread 441 is provided on an outer circumference of a fixing-tube section 44 provided protruding upward on a peripheral edge of a plug hole 42 of an engine head 41 for attaching an ignition coil 1 for internal combustion engine. A female thread 151 screwed into the male thread 441 is provided on an inner circumference of a fixed tube section 15 formed at a lower part of an insulating case 14 of the ignition coil 1 for internal combustion engine. By horizontally rotating the ignition coil 1 for internal combustion engine, the male thread 441 is screwed into the female thread 151, until an upper end of the fixing tube section 44 abuts against a packing 6 embedded into the bottom of an annular recessed section formed between the fixed tube section 15 at a lower part of an insulating case 14 and a high-pressure tower section 16, and the ignition coil 1 for internal combustion engine is attached to the engine 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an internal combustion engine ignition coil mounting structure for mounting an internal combustion engine ignition coil to an internal combustion engine (engine) such as an automobile, the internal combustion engine ignition coil and the engine can be positioned in the circumferential direction, and The present invention relates to an ignition coil mounting structure for an internal combustion engine that can prevent liquid from entering the internal combustion engine.

In general, as shown in FIG. 2, a conventional ignition coil 10 for an internal combustion engine includes an ignition coil body 11 that generates a high voltage, and a plug socket 21 that supplies a high voltage supplied from the ignition coil body 11 to the ignition plug 3. It consists of and.
The ignition coil body 11 has a cylindrical high voltage tower portion (not shown) having an open upper surface and a high voltage terminal accommodated in the lower portion, and a power connector portion 12 to which external signal lines, power lines, etc. are connected to the side portions. A coil, an iron core, and the like for generating a high voltage are accommodated in an insulating case 14 having a mounting flange 13 attached to the engine head 41 and filled with an insulating resin. The plug socket 21 is attached to a high-voltage tower portion below the insulating case 14 constituting the ignition coil body 11, and includes a rubber portion 22 made of an elastic body that insulates and seals a high voltage supplied from the ignition coil body 11, and an ignition plug. The boot part 23 made of an elastic body which is attached to the insulator part 3 and is insulated and sealed, and the boot part 23 and the rubber part 22 are mechanically connected, and the high voltage supplied from the ignition coil body 11 is supplied to the engine head. And an insulating pipe portion 24 having a conductor to be supplied to the spark plug 3 attached to 41.

  In the conventional internal combustion engine ignition coil 10, the plug socket 21 is inserted into the plug hole 42 of the engine head 41, and then the mounting flange 13 provided on the side of the insulating case 14 of the ignition coil body 11. Are attached to the engine 4 by fitting the mounting flange 13 and the mounting portion 43 of the engine head 41 with the bolt 5.

Here, the internal combustion engine ignition coil 10 can be attached to the engine 4 by screwing the ignition coil body 11 of the internal combustion engine ignition coil 10 and the plug hole 42 of the engine head 41 via a rotor. An internal combustion engine ignition coil 10 is proposed in Patent Document 1 below.
Japanese Patent No. 3498449

  In Patent Document 1, an ignition coil body having a plug socket that can be fitted to an ignition plug embedded in a plug hole of an engine head, an axial fixing mechanism that fixes the ignition coil body to the engine in the axial direction, and the shaft Structure of ignition coil for internal combustion engine provided with position adjustment mechanism for positioning ignition coil main body fixed by direction fixing mechanism in circumferential direction, and urging means (packing) sandwiched between ignition coil main body and engine It is shown. The axial direction fixing mechanism refers to a mechanism that screws the ignition coil body and the plug hole of the engine head via a rotor, and the position adjusting mechanism refers to an ignition coil for an internal combustion engine in the winding direction of the rotor. Is rotated over the first convex portion formed on the rotor, and when the ignition coil for the internal combustion engine rotates in the anti-screw winding direction of the rotor, the second convex portion is fitted to the first convex portion. The convex part is formed on the ignition coil for an internal combustion engine.

  As a result, the ignition coil for the internal combustion engine can be fixed to the engine without providing the mounting flange on the ignition coil body and the mounting portion on the engine head, thereby reducing the number of parts and reducing the cost. At the same time, it is possible to reduce the size of the internal combustion engine ignition coil by reducing the mounting area of the internal combustion engine ignition coil provided in the engine. Further, after the internal combustion engine ignition coil is fixed to the engine in the axial direction, the internal combustion engine ignition coil is rotated in the screw winding direction of the rotor, whereby the second convex portion formed on the internal combustion engine ignition coil is Since the first convex portion formed on the rotor is moved over, the circumferential position of the ignition coil for the internal combustion engine can be adjusted for each circumferential movement of the second convex portion overcoming the first convex portion. I can do it now.

  However, in the ignition coil for an internal combustion engine according to Patent Document 1, the position adjustment in the circumferential direction is adjusted by the second convex portion formed on the ignition coil body getting over the first convex portion formed on the rotor. Therefore, every time the second convex portion gets over the first convex portion, there is a problem that unnecessary vibration is applied to the internal combustion engine ignition coil and the internal combustion engine ignition coil may break down. Furthermore, the only mechanism for preventing water, foreign matter, etc. from entering the plug hole is the biasing means provided between the ignition coil body and the engine. When the inside of the ignition coil for an internal combustion engine is penetrated from the means, there is a possibility that the engine may be misfired, and there is a problem that a means for preventing the entry of water, foreign matter and the like more firmly is necessary.

  Therefore, the present invention has been proposed in view of the above circumstances, and can smoothly position the ignition coil for the internal combustion engine and the engine in the circumferential direction, and can prevent the liquid from entering the internal combustion engine reliably and firmly. An object of the present invention is to provide a mounting structure for an ignition coil for an internal combustion engine.

  In order to achieve the above object, the present invention is an internal combustion engine ignition coil mounting structure for mounting an internal combustion engine ignition coil to an internal combustion engine, and has a male screw portion on the outer periphery at the periphery of the plug hole of the internal combustion engine. A cylindrical portion is provided, and a fixed cylindrical portion having an internal thread portion to be screwed to the male screw portion is provided in an insulating case of the ignition coil for an internal combustion engine, and the female screw portion is screwed to the male screw portion. The internal combustion engine ignition coil is attached to the internal combustion engine.

  In the internal combustion engine ignition coil mounting structure, an annular elastic body is preferably interposed between the fixed cylinder portion and the insulating case and in the axial direction of the fixed cylinder portion.

  In the present invention, a fixed cylinder portion having a male screw portion on the outer periphery is provided on the periphery of the plug hole of the internal combustion engine, and a female screw portion to be screwed into the male screw portion of the fixed cylinder portion is provided in the insulating case of the ignition coil for the internal combustion engine. The fixed cylinder portion provided on the inner periphery is provided, the internal thread portion is screwed into the internal thread portion, and the internal combustion engine ignition coil is attached to the internal combustion engine, so that the internal combustion engine ignition coil is fixed to the internal combustion engine without rattling. In addition, the circumferential positioning can be performed smoothly. In particular, by providing a male screw part on the outer periphery of the fixed cylinder part of the internal combustion engine and a female screw part screwed to the male screw part on the inner periphery of the fixed cylinder part of the insulating case, the fixed cylinder part of the insulating case The internal combustion engine ignition coil can be fixed to the internal combustion engine in a state where the fixed cylinder portion of the internal combustion engine is covered, and the male screw portion is screwed into the female screw portion at a position higher than the upper end surface of the engine head. Therefore, it is possible to reliably prevent liquid, foreign matter and the like from entering the plug hole from the outside of the internal combustion engine.

  Furthermore, since the annular elastic body is interposed between the fixed cylinder part and the insulating case and in the axial direction of the fixed cylinder part, the circumferential positioning can be performed more smoothly. Furthermore, after fixing the ignition coil for the internal combustion engine to the internal combustion engine, it is possible to secure a tight seal between the fixed cylinder portion and the insulating case, so that liquid, foreign matter, etc. enter the plug hole from the outside of the internal combustion engine. This can be prevented more firmly.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view corresponding to a schematic partial cross-sectional view showing a main part of one embodiment of a mounting structure of an ignition coil for an internal combustion engine according to the present invention. 2 that are the same as or equivalent to those shown as the conventional example in FIG.

As shown in FIG. 1, the present invention is an internal combustion engine ignition coil 1 mounting structure for mounting an internal combustion engine ignition coil 1 to an internal combustion engine (engine 4).
First, a fixed cylinder portion 15 is formed outside the high-pressure tower portion 16 at a lower portion of the insulating case 14 constituting the ignition coil body 11 of the internal combustion engine ignition coil 1. The fixed cylinder portion 15 has a female screw portion 151 on the inner periphery. A packing 6 as an annular elastic body is embedded in the bottom of an annular recess formed between the inner periphery of the fixed cylindrical portion 15 below the insulating case 14 and the high-pressure tower portion 16.

  On the other hand, in the engine 4 to which the internal combustion engine ignition coil 1 is attached due to the mounting structure of the internal combustion engine ignition coil 1 according to the present invention, on the periphery of the plug hole 42 of the engine head 41 and above the upper end surface of the engine head 41. A fixed cylinder portion 44 is provided that protrudes toward the bottom. The fixed cylinder portion 44 has a male screw portion 441 on the outer periphery that is screwed into a female screw portion 151 formed on the inner periphery of the fixed cylinder portion 15 below the insulating case 14.

Next, a method of mounting the internal combustion engine ignition coil 1 to the engine 4 to which the internal combustion engine ignition coil 1 mounting structure according to the present invention is applied will be described.
First, the plug socket 21 of the internal combustion engine ignition coil 1 is inserted into the plug hole 42 of the engine head 41. Subsequently, the fixed cylinder portion 15 at the lower part of the insulating case 14 is placed on the fixed cylinder portion 44 provided at the periphery of the plug hole 42. Further, the internal combustion engine ignition coil 1 is rotated in the horizontal direction, the male screw portion 441 of the fixed cylinder portion 44 is screwed into the female screw portion 151 of the fixed cylinder portion 15, and the internal combustion engine ignition coil 1 is attached to the engine 4. . At this time, the internal combustion engine ignition is performed until the upper end of the fixed cylinder portion 44 comes into contact with the packing 6 embedded in the bottom of the annular recess formed by the fixed cylinder portion 15 and the high-pressure tower portion 16 below the insulating case 14. The coil 1 is rotated in the horizontal direction.

The internal combustion engine ignition coil 1 is slightly rotated in the horizontal direction for fine adjustment, and the screwing of the male screw portion 441 and the female screw portion 151 is slightly loosened or tightened, whereby the orientation of the internal combustion engine ignition coil 1 is adjusted. Are positioned in the circumferential direction so as to be directed to the auxiliary line direction of the plurality of signal lines and power supply lines provided in the engine 4 and connected to the power supply connector portion 12 of the ignition coil 1 for the internal combustion engine. Are connected to the power connector portion 12 of the ignition coil 1 for an internal combustion engine. Thus, the attachment of the internal combustion engine ignition coil 1 to the engine 4 is completed.
In addition, from the viewpoint of surely preventing liquid and foreign matter from entering, the male screw portion 441 and the female screw portion 151 are screwed to such an extent that the packing 6 and the upper end of the fixed cylinder portion 44 are in contact with each other and further twisted. It is preferable. Then, even after positioning in the circumferential direction, the packing 6 and the upper end of the fixed cylinder portion 44 are surely in contact with each other, so that the prevention of intrusion of liquid, foreign matter, etc. from the outside of the engine 4 into the plug hole 42 is strong. It becomes.

  Therefore, in the internal combustion engine ignition coil 1 mounting structure according to the present invention, the internal combustion engine ignition coil 1 can be fixed to the engine 4 without rattling. Further, as described above, the positioning in the circumferential direction can be performed by fine adjustment of slightly loosening or tightening the screwing of the male screw portion 441 and the female screw portion 151, so that the internal combustion engine ignition coil 1 and the engine 4 The positioning in the circumferential direction can be performed smoothly. In addition, the internal combustion engine ignition coil 1 is attached to the engine 4 in a state in which the fixed cylindrical portion 44 provided at the periphery of the plug hole 42 is covered by the fixed cylindrical portion 15 below the insulating case 14; Since the male screw portion 441 and the female screw portion 151 are screwed at a position higher than the upper end surface of the engine head 41, it is possible to reliably prevent liquid, foreign matter and the like from entering the plug hole 42 from the outside of the engine 4. be able to.

  Further, in a state where the internal combustion engine ignition coil 1 is fixed to the engine 4, an annular elasticity embedded in the bottom of an annular recess formed between the fixed cylindrical portion 15 and the high-pressure tower portion 16 below the insulating case 14. Since the packing 6 as a body is interposed between the fixed cylindrical portion 44 and the insulating case 14 and in the axial direction of the fixed cylindrical portion 44, the circumferential direction between the internal combustion engine ignition coil 1 and the engine 4 Positioning can be performed smoothly, and after the ignition coil 1 for the internal combustion engine is fixed to the engine 4, a tight seal between the fixed cylinder portion 44 and the insulating case 14 can be ensured. 4 It is possible to more firmly prevent liquid, foreign matter and the like from entering the plug hole 42 from the outside.

  Here, the packing 6 as an annular elastic body is not particularly limited as long as it can be molded into an annular shape and exhibits elasticity, and any elastic material such as rubber or elastomer can be applied.

  Further, the packing 6 as an annular elastic body is used for an internal combustion engine according to the present invention, instead of being embedded in the bottom of an annular recess formed between the high-pressure tower section 16 and the fixed cylinder section 15 below the insulating case 14. Depending on the mounting structure of the ignition coil 1, the engine head 41 to which the internal combustion engine ignition coil 1 is mounted may be provided at the upper end of the fixed cylinder portion 44 provided at the periphery of the plug hole 42. In the case of such an embodiment, the packing 6 provided at the upper end of the fixed cylinder portion 44 is the bottom of the annular recess formed between the high-pressure tower portion 16 below the insulating case 14 and the fixed cylinder portion 15. The internal combustion engine ignition coil 1 is rotated in the horizontal direction until the male screw portion 441 is screwed into the female screw portion 151 until it comes into contact with the female screw portion 151. Even in such an embodiment, the internal combustion engine ignition coil 1 and the engine 4 can be smoothly positioned in the circumferential direction, and liquid can be prevented from entering the engine 4 reliably and firmly. An internal combustion engine ignition coil mounting structure that can be provided can be provided.

  As mentioned above, although embodiment of this invention was explained in full detail, unless this invention deviates from the matter described in the claim, various design changes are performed without being limited to the said embodiment. It is possible.

It is explanatory drawing equivalent to the general | schematic fragmentary sectional view which shows the principal part of one Embodiment in the attachment structure of the ignition coil for internal combustion engines which concerns on this invention. It is a general | schematic fragmentary sectional view which shows the attachment structure between the conventional ignition coil for internal combustion engines, and an internal combustion engine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ignition coil for internal combustion engines 10 Conventional ignition coil for internal combustion engines 11 Ignition coil body 12 Power supply connector part 13 Mounting flange 14 Insulating case 15 Cylinder part 151 Female thread part 16 High-pressure tower part 21 Plug socket 22 Rubber part 23 Boot part 24 Insulating pipe part 3 Spark plug 4 Engine 41 Engine head 42 Plug hole 43 Mounting part 44 Fixed cylinder part 441 Male thread part 5 Bolt 6 Annular elastic body (packing)

Claims (2)

An internal combustion engine ignition coil mounting structure for mounting an internal combustion engine ignition coil to an internal combustion engine,
On the periphery of the plug hole of the internal combustion engine, a fixed cylinder portion having a male screw portion on the outer periphery is provided,
In the insulation case of the ignition coil for an internal combustion engine, a fixed cylinder portion having an internal thread portion screwed into the external thread portion on the inner periphery is provided,
The internal combustion engine ignition coil is attached to the internal combustion engine by screwing the female screw portion into the male screw portion.
A structure for mounting an ignition coil for an internal combustion engine. The internal combustion engine ignition coil mounting structure according to claim 1,
An annular elastic body is interposed between the fixed cylinder part and the insulating case and in the axial direction of the fixed cylinder part.
A structure for mounting an ignition coil for an internal combustion engine.

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