KR101425484B1 - Engine's ignition coil - Google Patents

Abstract

The present invention relates to a spark plug having an input terminal portion connected to an external power source, a cylindrical primary spool detachably connected to the input terminal portion and hollowed from an upper end connected to an external power source to a lower end coupled with an ignition spark, A secondary coil wound around an outer circumferential surface of the secondary spool, and a secondary coil wound around an outer circumferential surface of the secondary spool, An insulating paper which is provided between the center core and the secondary spool and insulates the insulating core, and a buffer member filled between the center core and the insulating paper to alleviate thermal stress generated in the center core and the epoxy cured outside the center core during engine driving An ignition coil for an internal combustion engine is disclosed. According to the above configuration, it is possible to prevent the insulation deterioration and the output voltage drop of the center core provided in the ignition coil for the internal combustion engine and to prevent cracks from occurring in the epoxy filled between the respective members.

Description

[0001] The present invention relates to an ignition coil for an internal combustion engine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil for an internal combustion engine, and more particularly, to an ignition coil for an internal combustion engine that prevents insulation deterioration of a center core provided in an ignition coil for an internal combustion engine.

Generally, an internal combustion engine is an internal combustion engine that uses internal combustion engines to expand the combustion gas due to the combustion of fuel. Among such internal combustion engines, gasoline engines require separate ignition devices for the combustion of the fuel. The ignition apparatus includes an ignition plug which is combined with a combustion chamber of a gasoline engine and fires flame to compress a gas mixture in a combustion chamber of a gasoline engine, and a switching operation which is attached to the driver's seat to intermit the current of the ignition device circuit to start or stop the gasoline engine And an ignition coil which is operated in accordance with the switching operation of the ignition switch to induce a low voltage of the battery or the generator to a high voltage so that the spark plug sparks a strong flame.

In the ignition coil of the internal combustion engine as described above, it is necessary to combine the coils of the first and second spools for supporting the first and second coils in order to minimize the loss in the process of amplifying the voltage and inducing it to the high voltage.

In the ignition coil of the internal combustion engine, the center core provided inside the case is packaged in a resin insulating material such as an epoxy resin. The resin insulating material is filled between the respective members provided in the case to secure the insulation between the respective members and to maintain the stability of the respective members.

Since the center core is directly supplied with a high voltage, the heat generated in the engine of the internal combustion engine is directly transmitted to the center core, and the thermal stress is transmitted to the resin insulator by the difference in expansion coefficient of each member constituting the ignition coil of the internal combustion engine. do. As a result, cracks are generated in the resin insulating material, and the cracking of the resin insulating material lowers the degree of insulation of the ignition coil of the internal combustion engine and lowers the output voltage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to prevent an insulation drop and an output voltage drop of a center core provided in an ignition coil for an internal combustion engine.

It is another object of the present invention to prevent cracks from being generated in the epoxy due to a difference in stress caused by a difference in coefficient of linear expansion between the core and the epoxy.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

To achieve the above object, according to one aspect of the present invention, there is provided an ignition coil for an internal combustion engine including an input terminal connected to an external power source, and an ignition coil connected to the ignition spark from an upper end connected to the external power source, A secondary spool inserted into the hollow provided in the primary spool; a secondary spool wound around the secondary spool on the outer peripheral surface of the secondary spool; An insulating paper provided between the center core and the secondary spool and insulated therefrom; and an insulating paper filled between the center core and the insulating paper so that the center core and the epoxy And a buffer member for relieving the generated thermal stress.

According to the above configuration, it is possible to prevent the insulation deterioration and the output voltage drop of the center core provided in the ignition coil for the internal combustion engine and to prevent cracks from occurring in the epoxy filled between the respective members.

According to the above-mentioned problem solving means, the present invention prevents the direct contact between the center core and the epoxy filled in the outside of the center core by filling the buffer member between the center core and the insulating paper provided in the ignition coil for the internal combustion engine or by forming the insulating air layer It is possible to prevent cracks which may be caused by different linear expansion coefficients of the respective components such as the center core and the epoxy and to prevent the insulation breakdown of the ignition coil and the output voltage of the ignition coil from being lowered.

Further, according to the present invention, by filling a buffer member between the center core of the ignition coil for the internal combustion engine and the insulating paper provided on the outer circumferential surface of the center core, or by forming an insulating air layer, the thermal stress of the center core is sufficiently relaxed . As a result, cracking can be prevented from occurring in the insulating paper.

Further, the present invention has the effect that the center core can be doubly buried together with the insulating paper by the buffer member or the insulating air layer filled between the center core of the ignition coil for the internal combustion engine and the insulating paper provided on the outer circumferential surface of the center core.

1 is a sectional view showing an ignition coil for an internal combustion engine according to an embodiment of the present invention;
Figure 2 shows the central core of Figure 1;
Fig. 3 is a view showing a modification of the center core of Fig. 1; Fig.
Fig. 4 shows another modification of the center core of Fig. 1; Fig.

It should be understood that the specific details of the invention are set forth in the following description to provide a more thorough understanding of the present invention and that the present invention may be readily practiced without these specific details, It will be clear to those who have knowledge.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to FIGS. 1 to 4. FIG.

FIG. 1 is a cross-sectional view showing an ignition coil for an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is a view showing the center core of FIG.

 1 and 2, an ignition coil 100 for an internal combustion engine according to an embodiment of the present invention includes an input terminal unit 110, a primary spool 140, a primary coil 130, a secondary spool 160, A secondary coil 150, a center core 260, an insulating paper 220, and a buffer member 240.

The primary spool 140 may be detachably coupled to the input terminal 110 and may be formed in a hollow cylindrical shape extending from an upper end connected to an external power source to a lower end coupled with an ignition spark. The primary coil 130 is wound around the outer circumferential surface of the primary spool 140. The primary coil 130 is a device provided so that the input power can be smoothly circulated, and the shape of the primary coil 130 can be changed according to requirements required in the invention.

The secondary spool 160 may be inserted into the hollow of the primary spool 140 and may be formed in a cylindrical shape so that the center core 260 may be inserted therein. The secondary coil 150 may be wound on the outer circumferential surface of the secondary spool 160 to guide the circulation of the input power together with the primary coil 130.

The case 120 including the primary spool 140 and the secondary spool 160 may be provided on the outer surfaces of the primary spool 140 and the secondary spool 160. The case 120 may be detachably attached to the input terminal 110, Lt; / RTI >

A power outlet (not shown) may be provided for the input terminal unit 110, and a coupling unit (not shown) for coupling with the case 120 may be provided. .

The center core 260 is a cylindrical magnetic body in which a plurality of thin plate-shaped silicon steel plates having different widths are laminated along the diameter direction of the center core 260.

An insulating paper 220 may be provided between the center core 260 and the secondary spool 160. The insulating paper 220 may be formed of a material such as PP or PPE and is formed to be longer than the length of the central core 260 in the axial direction so that the center core 260 and the primary spool 140 and the secondary spool 160 To be insulated.

When the ignition coil 100 according to the above structure is formed, an epoxy (not shown) may be filled between the members. The epoxy can ensure the insulation between the members and maintain the stability of the members. Such an epoxy may be formed by filling an epoxy in a liquid state between respective members of the ignition coil 100 and curing when each member of the ignition coil 100 is assembled.

The insulating paper 220 may be formed by opening the upper and lower portions of the insulating paper 220 and inserting a buffer member 240 between the insulating paper 220 and the center core 260 after inserting the center core in one direction of the opening of the insulating paper 220. Can be filled.

The cushioning member 240 may be provided along the upper, lower, and outer peripheries of the center core 260, and more specifically, the upper, lower, and side portions of the center core 260. By providing the buffer member 240 around the center core 260 as described above, thermal stress generated in the edge region of the center core 260 when the ignition coil 100 of the internal combustion engine operates is transferred to the epoxy . This prevents cracks due to shrinkage and expansion of the center core 260 during the curing process of the epoxy

The buffer member 240 is provided between the center core 260 and the insulating paper 220 so that the insulating paper 220 and the buffer member 240 are insulated from the center core 260 and the epoxy .

FIG. 3 is a view showing a modified example of the center core of FIG. 1, and FIG. 4 is a view showing another modified example of the center core of FIG.

Before describing the drawings, the same reference numerals as those shown in Figs. 1 and 2 are denoted by the same reference numerals, and a detailed description thereof will be omitted.

3, an insulating air layer 280 may be formed between the center core 260 and the insulating paper 240, and the buffer member 240 may be filled on the upper and lower sides of the center core 260. FIG. The insulating air layer 280 may be a space for blocking the contact between the center core 260 and the insulating paper 240, such as the buffer member 240. As described above, the shock absorbing member 240 formed at the upper and lower portions between the center core 260 and the insulating paper 240 reduces the shrinkage expansion occurring at the upper and lower corners of the center core 260 as described above, Thereby preventing transmission. Similarly, the insulating air layer 280 formed between the center core 260 and the insulating paper 240 can also prevent the thermal stress generated from the outer wall of the center core 260 from being transmitted to the epoxy. This prevents cracks due to contraction and expansion of the center core 260 in the epoxy.

The cushioning member 240 includes an upper cushioning member 242 that extends from the upper side of the center core 260 to the outer periphery and is formed with a first extended surface 243 to be in contact with the upper inner surface of the insulating paper 240, And a lower cushioning member 244 formed to extend from the lower side of the lower surface 260 to the lower surface of the insulating paper 240 to form a second extended surface 245. At this time, the insulating paper 240 may be fixed to the first and second extended surfaces 243 and 245.

That is, the insulating air layer 280 is an empty space formed between the center core 260 and the insulating paper 240. Therefore, in order to fix the center core 260 and the insulating paper 240, the buffer member 240 is formed with first and second extended surfaces 243 and 245 in the outer circumferential direction from the upper side and the lower side of the center core 260, respectively do. The formed first and second extended surfaces 243 and 245 respectively support and fix the center core 260 circumscribing the upper and lower sides of the center core 260. At this time, the lengths of the first and second extended surfaces 243 and 245 may be formed to a minimum length to support and fix the center core 260.

The cushioning member 240 includes an upper cushioning member 242 provided on the upper side of the center core 260 and a lower cushioning member 244 provided on the lower side of the center core 260, And may be formed to be movable in the insulating air layer 280.

4, the buffer member 240 may be provided only on the upper side and the lower side of the center core 260. At this time, since the center core 260 is seated in the insulating air layer 280, the center core 260 can move upward, downward, leftward, or rightward in the insulating air layer 280. By placing the center core 260 in the insulating air layer 280 as described above, the thermal stress generated in the center core 260 is relaxed in the insulating air layer 280 and the secondary stress is relaxed in the insulating paper 220 Cracks can be prevented from occurring in the epoxy.

The cushioning member 240 or the insulating air layer 280 is provided between the center core 260 and the insulating paper 220 of the ignition coil 100 for the internal combustion engine as described above so that the thermal stress generated in the center core 260 It is possible to prevent the epoxy resin from being directly transferred to the epoxy, and also to relieve the stress caused by the insulating paper, the buffer member, the insulating air layer, and the like, and to prevent cracks from occurring in the epoxy.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

100: Ignition coil for internal combustion engine 110: Input terminal part
120: Case 130: Primary coil
140: primary spool 150: secondary coil
160: Secondary spool 220: Insulating paper
240: buffer member 242: upper buffer member
243: first extended surface 244: lower cushioning member
245: second extended surface 260: central coil
280: Insulating air layer

Claims (6)

An input terminal connected to an external power source;
A cylindrical primary spool detachably coupled to the input terminal portion and hollowed from an upper end connected to an external power source to a lower end coupled with an ignition spark;
A primary coil wound on the outer surface of the primary spool;
A secondary spool inserted into the hollow provided in the primary spool;
A secondary coil wound on the outer surface of the secondary spool;
A center core mounted within the secondary spool;
An insulating paper provided between the center core and the secondary spool for insulation;
A buffer member filled between the center core and the insulating paper to alleviate thermal stress generated in the center core and the epoxy when the engine is driven; / RTI >
The buffer member may be silicon (Si) or silicon rubber,
And a second core layer
And an insulating air layer is further formed between the insulating paper and the center core. delete The method according to claim 1,
The buffer member
And an outer periphery of the center core, and upper and lower sides of the center core. delete The method according to claim 1,
The buffer member
An upper cushioning member extending from an upper side of the central core to an outer periphery thereof and having a first extended surface to be in contact with an upper inner surface of the insulating paper,
And a lower cushioning member extending from the lower side of the center core to the outer periphery thereof and having a second extended surface to be in contact with the lower inner surface of the insulating paper,
And the insulating paper is fixed to the first and second extended surfaces. The method according to claim 1,
The buffer member
An upper cushioning member provided on the upper side of the center core,
And a lower cushioning member provided below the center core,
And the center core is movable in the insulating air layer.

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