JP2008041799A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the secondary coil bobbin of an ignition coil which supplies a high voltage to the ignition plug of an internal combustion engine of an automobile etc; to generate a spark discharge. <P>SOLUTION: The secondary coil is wound on a bobbin in layers in its circumferential direction. The secondary coil is wound on the bobbin in layers by flanges in its circumferential direction. The flanges are provided on both the ends of the secondary coil and a part of the secondary coil between its ends, and molded in one piece with the bobbin. A slit is alternately provided on the flanges to make the adjacent secondary coils open to each other. The secondary coil is wound on a section of the bobbin separated by the flanges, then wound on a next section passing through the slit, and then wound on the last section of the bobbin. The flanges are provided to make the adjacent second coils open to each other, so that an insulating filling resin member penetrates into gaps between the secondary coils through the open part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ignition coil for an internal combustion engine in which an insulating filling resin member easily penetrates between secondary coils of an ignition coil that supplies a high voltage to an ignition plug of an internal combustion engine in an automobile or the like and generates a spark discharge. is there.

  FIG. 4 is a view for explaining a coil bobbin of an ignition coil for an internal combustion engine in a conventional example. In FIG. 4, the coil bobbin 41 is partitioned by flanges 421, 422, 423,. The coil bobbin 41 is provided with slits 431 and 432 for the coil to pass to the next layer. The coil bobbin 41 has a slit in a portion that cannot be seen in the figure. FIG. 5 (a) is a view showing a state in which a secondary coil is wound around a coil bobbin of an ignition coil for an internal combustion engine in a conventional example. (B) is a cross-sectional view taken along line EE of (a), and (c) is ( It is FF sectional drawing of a). 5, secondary coils 451, 452, 453,..., 45n are wound around the coil bobbin 41 shown in FIG.

  In (b), which is a cross-sectional view taken along the line EE in FIG. 5 (a), the secondary coils 451 to 45n are wound around a region partitioned by the flanges 421 to 42n. In FIG. 5A, which is a cross-sectional view taken along the line FF in FIG. 5A, the secondary coils 451 to 45n are free from wrinkles in the regions adjacent to the slits 431 and 432.

Further, in the ignition coil for an internal combustion engine described in Japanese Patent Application Laid-Open No. 2003-229318, a flange formed on the circumference of the bobbin is provided with a low slit having a different height. Further, the ignition coil for an internal combustion engine described in Japanese Patent Application Laid-Open No. 2005-286156 is provided with a groove across a flange of a bobbin around which a secondary coil is wound.
JP 2003-229318 A JP 2005-286156 A

  In the ignition coil for an internal combustion engine described in Japanese Patent Laid-Open No. 2003-229318, the mechanical strength and impregnation are improved by lowering the slit in consideration of the mechanical strength of the bobbin. Further, the ignition coil for an internal combustion engine described in Japanese Patent Application Laid-Open No. 2005-286156 simplifies the molds and reduces the number of molds and the number of times the molds are pulled out.

  In the case of FIG. 5C, the insulating filling resin member not shown is easy to fill from the slits 431 and 432 between the secondary coils. However, in the case of FIG. 5 (b), since the secondary coil is always sandwiched between the flanges 421 to 42n, there is a problem that the insulating filling resin member is difficult to penetrate between the secondary coils. It was.

  In order to solve the above-described problems, the present invention provides a coil bobbin having a shape such that the secondary coil wire is not sandwiched between the ridges and the ridges. It is an object of the present invention to provide an ignition coil for an internal combustion engine that can penetrate between the two. Another object of the present invention is to provide an ignition coil for an internal combustion engine that can achieve the mechanical strength and the permeability of the insulating filling resin member at the same time.

(First invention)
An ignition coil for an internal combustion engine according to a first aspect of the invention includes an iron core-coil assembly including a primary coil and a secondary coil wound around each bobbin, and an iron core that is magnetically coupled to each of the coils, and the iron core- An insulating case that houses a control circuit including a power switch that generates a high voltage by conducting and interrupting current in the coil assembly and the primary coil based on an ignition signal, and the iron core-coil combination in the insulating case A secondary coil that houses the three-dimensional body and the control circuit, and includes at least an insulating filling resin member that is filled and solidified therein, and is wound in the circumferential direction of the bobbin to form a plurality of layers; A plurality of scissors that are respectively provided between both ends of the plurality of secondary coils wound in the circumferential direction and formed integrally with the bobbin; Provided alternately in each of the flange, characterized in that side the adjacent secondary coils are at least composed of a slit provided as open.

(Second invention)
In the ignition coil for an internal combustion engine of the second invention, the rod and the slit of the first invention have the same circumferential width.

(Third invention)
In the ignition coil for an internal combustion engine of the third invention, the slits of the first invention or the second invention are alternately provided in each of the plurality of saddles, and one side or both sides of the secondary coil are opened. It is characterized by.

(Fourth invention)
In the ignition coil for an internal combustion engine according to a fourth aspect, the slits according to the first to third aspects have a circumferential width wider than the width of the flange.

  According to the present invention, since one side of the secondary coil wound around the coil bobbin is a slit and both sides of the secondary coil are not sandwiched between the hooks, the insulating filling resin member can be easily interposed between the coils. A highly reliable ignition coil for an internal combustion engine that penetrates and does not deteriorate in insulation due to aging with respect to a high voltage can be obtained.

  According to the present invention, by alternately providing ridges and slits on the coil bobbin, both sides of the secondary coil are prevented from being sandwiched between ridges, so that the insulating filling resin member penetrates into the coil from one slit portion. As a result, the ignition coil for an internal combustion engine having high insulating properties could be obtained.

  According to the present invention, by appropriately changing the gap between the flange and the slit of the coil bobbin, the insulating filling resin member easily penetrates into the inside of the coil, and the strength as a small ignition coil for an internal combustion engine is increased. It can be held sufficiently.

  According to the present invention, by providing the coil bobbin ridges and slits at appropriate intervals, the permeability of the insulating filling resin member between the coils is improved, and a filling failure does not occur.

(First invention)
An ignition coil for an internal combustion engine according to a first aspect of the invention includes an iron core-coil assembly including a primary coil and a secondary coil wound around each bobbin, and an iron core that is magnetically coupled to each of the coils, and the iron core- An insulating case that houses a control circuit including a power switch that generates a high voltage by conducting and interrupting current in the coil assembly and the primary coil based on an ignition signal, and the iron core-coil combination in the insulating case The housing and the control circuit are housed, and at least an insulating filling resin member filled inside and solidified is provided.

  The secondary coil is wound in the circumferential direction of the bobbin so as to form a plurality of layers. The secondary coil is wound in a circumferential direction of the bobbin so as to form a plurality of layers by a plurality of scissors. The flange is provided between and at both ends of the secondary coil, and is formed integrally with the bobbin. The slits are alternately provided in each of the plurality of ridges, and are provided so that adjacent sides of the secondary coil are opened. After the secondary coil is wound, it is wound in the same manner in the next layer across the slit and reaches the last layer. Since the adjacent side of the secondary coil is opened in the plurality of scissors, the insulating filling resin member easily penetrates between the coils from this portion, and the insulation is not broken even by a high voltage, and the reliability is high. improves.

(Second invention)
The soot and the slit in the ignition coil for the internal combustion engine of the second invention are divided into 90 degrees, 60 degrees, and 30 degrees, for example. When the ridge is provided with a slit every 90 degrees, four ridges and four slits are integrally formed on the bobbin with the same circumferential width, and a slit is formed on the other side of the ridge. ing. The number of the ridges and slits and the angle to be divided are not particularly limited, and can be any number.

(Third invention)
The slits in the ignition coil for an internal combustion engine according to the third aspect of the invention can be provided alternately in each of the plurality of soots and can be opened on both sides of the secondary coil. That is, a part of the slit is provided so that both sides of the secondary coil that are adjacent to each other are opened, so that the insulation-filled resin member is not prevented from penetrating into the coil due to the presence of the ridge.

(Fourth invention)
The slit in the ignition coil for an internal combustion engine according to the fourth aspect of the invention is shaped so that the circumferential width is wider than the width of the flange. That is, since the circumferential length of the plurality of ridges is shorter than the circumferential length of the slit, more insulating filling resin member can penetrate into the coil from this portion.

  FIG. 1 is a perspective view for explaining a coil bobbin in an internal combustion engine ignition coil according to a first embodiment of the present invention. FIG. 2 (a) is a view showing a state in which a secondary coil is wound around a coil bobbin of an ignition coil for an internal combustion engine in the first embodiment of the present invention, and (b) is a cross-sectional view taken along line AA in (b). (C) is a cross-sectional view taken along line BB of (A). In FIG. 1 and FIG. 2, the coil bobbin 11 is formed by forming a plurality of ridges on a cylindrical body 111 in layers. The coil bobbin 11 is formed with flanges 121, 122, 123 at the left end in FIG. 1, and a secondary coil 23 (FIG. 2 (b) between the flanges 121, 122, 123 and the flanges 141, 142,. B) is wound.

  Further, as shown in FIG. 2A, a secondary coil 24 is wound between the flanges 141, 142,... And the flanges 161,. Similarly, the secondary coils 25, 26, and 27 (see FIG. 2B) are wound around the coil bobbin 11 by the scissors. In the first embodiment of FIG. 2, the ridges and slits are formed so as to be alternately provided by 60 degrees. For example, as shown in FIG. 2 (B), in the cross section along line A-A in FIG. 2 (A), the rod 122, the secondary coil 23, the slit 151, the secondary coil 24, the rod 161, the secondary coil 25, The slit 181, the secondary coil 26, the flange 201, the secondary coil 27, and the slit 211 are alternately arranged. The secondary coils 23 to 27 are configured so that there is always a ridge on one side and a slit on the other side. Therefore, the secondary coils 23 to 27 can improve the insulation of the ignition coil because the insulating filling resin member easily penetrates from the slit-free slit side.

  As shown in FIG. 2 (c), in the cross section taken along line BB in FIG. 2 (a), the slit 131, the secondary coil 23, the flange 141, the secondary coil 24, the slit 171, the secondary coil 25,鍔 191, secondary coil 26, slit 202, secondary coil 27, and 鍔 221 are alternately provided. Similarly to the above, the secondary coils 23 to 27 are configured such that there is a ridge on one side and a slit on the other side, and the positions of the ridge and the slit are opposite to those in FIG. In the position. Accordingly, either one of the secondary coils 23 to 27 becomes a slit-free slit side, and the insulation-filled resin member can easily penetrate from this portion, so that the insulation of the ignition coil can be improved.

  FIGS. 3 (a) to (d) are for explaining a coil bobbin in an ignition coil for an internal combustion engine according to a second embodiment of the present invention, and (a) is for explaining a coil bobbin in the second embodiment. It is a perspective view, (B) is a perspective view showing a state where a secondary coil is wound around a coil bobbin, (C) is a cross-sectional view taken along the line CC of (B), and (D) is a DD of (B). It is line sectional drawing. In FIG. 3A, the coil bobbin 31 has a plurality of ridges formed in layers on a cylindrical body 311. The ridges in one layer are formed alternately with slits. The wrinkles in the next layer are similarly formed alternately with the slits, and at the same time, the secondary coil 371 has a structure that is not sandwiched between the wrinkles.

  The second embodiment includes a portion where the secondary coils 371 to 375 are sandwiched between the flange and the slit, and a portion where both sides of the secondary coils 371 to 375 are formed of slits. For example, FIG. 3B is a cross-sectional view taken along the line CC in FIG. 3B. Both sides of the secondary coil are not sandwiched between the slits 32 to 37 by the scissors. That is, the said structure can permeate | transmit the said insulation filling resin member from the both sides of a secondary coil. However, if the number of the ridges is too small, it also affects the mechanical strength of the coil bobbin 31. Therefore, it is desirable to determine the number of ridges and slits or the positions where the slits are provided in consideration of this point. .

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example. The present invention can be modified in various ways without departing from the scope of the claims. For example, a well-known or well-known thing can be employ | adopted for the ignition coil for internal combustion engines in this example, the material of a coil bobbin, the secondary coil winding method, etc. Further, the number and width of the ridges and slits of the present invention can be arbitrarily changed depending on the size, capacity, etc. of the ignition coil.

It is a perspective view for demonstrating the coil bobbin in the ignition coil for internal combustion engines which is 1st Example of this invention. (Example 1) (A) is a figure which shows the state which wound the secondary coil around the coil bobbin of the ignition coil for internal combustion engines in 1st Example of this invention, (b) is the sectional view on the AA line of (a), ) Is a cross-sectional view taken along the line BB of FIG. (A) to (d) are for explaining a coil bobbin in an internal combustion engine ignition coil according to a second embodiment of the present invention, and (a) is a perspective view for explaining a coil bobbin in the second embodiment. (B) is a perspective view showing a state in which a secondary coil is wound around a coil bobbin, (c) is a cross-sectional view taken along line CC of (b), and (d) is a cross-sectional view taken along line DD of (b). FIG. (Example 2) It is a figure for demonstrating the coil bobbin of the ignition coil for internal combustion engines in a prior art example. (A) is a figure which shows the state which wound the secondary coil around the coil bobbin of the ignition coil for internal combustion engines in a prior art example, (b) is the EE sectional view taken on the line (a), (c) is (a). It is the FF sectional view taken on the line.

Explanation of symbols

11 ... Coil bobbin 111 ... Tube 121, 122, 123, 141, 142, 161, 191, 192, 201, 221, 222 ... 鍔 131, 132, 133, 151, 171, 181, 202, 211 ... Slit 23, 24, 25, 26, 27 ... Secondary coil 31 ... Coil bobbin 311 ... Cylindrical body 321, 341, 361 ... ３２ 32, 33, 34, 35, 36, 37 ... Slit 371, 372, 373, 374, 375 ... Secondary coil

Claims (4)

An iron core-coil assembly comprising a primary coil and a secondary coil wound around each bobbin, and an iron core magnetically coupled to each of the coils;
An insulating case that houses a control circuit including a power switch that generates a high voltage by performing energization and interruption of current in the iron core-coil assembly and the primary coil based on an ignition signal;
The iron core-coil assembly and the control circuit are housed in the insulating case, and filled and solidified with an insulating filling resin member;
In an internal combustion engine ignition coil comprising at least
A secondary coil wound in the circumferential direction of the bobbin so as to form a plurality of layers;
A plurality of scissors which are respectively provided between both ends of the plurality of secondary coils wound in the circumferential direction and formed integrally with the bobbin;
A slit provided alternately to each of the plurality of scissors and provided so that adjacent sides of the secondary coil are opened;
An ignition coil for an internal combustion engine, comprising at least   The ignition coil for an internal combustion engine according to claim 1, wherein the flange and the slit have the same circumferential width.   3. The internal combustion engine according to claim 1, wherein the slits are alternately provided in each of the plurality of eaves, and one side or both sides of the secondary coil are opened. Ignition coil.   The ignition coil for an internal combustion engine according to any one of claims 1 to 3, wherein the slit has a circumferential width wider than a width of the flange.

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