JPH11260657A - Core in ignition coil and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core with a laminated structure, in which a given radius of the core is set surely, when a plurality of magnetic plates are laminated in a cylindrical shape, and also to provide its manufacturing method. SOLUTION: A core is made up of a plurality of plates M1 to M26 with differing widths A first core part 10a has an almost semicircular cross section, and in this case plates M1 to M26 are laminated in order of increasing width in the same cutting direction. A second core part 10b has an almost semicircular cross section, and plates M1 to M12 are laminated in order of decreasing width in the same direction. Each face with largest width face of the first and second core parts 10a and 10b is fitted to each other to form a laminated core with an almost circular cross section. Both end faces of the plates M1 to M26 in a width direction have burrs B1 and Bs, but these burrs B1 and B2 are not butted to each other when the plates M1 to M26 are laminated, and the Plates M1 to M26 are joined tightly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil core, and more particularly to an ignition coil core formed by laminating a plurality of magnetic plates to form a column.

[0002]

2. Description of the Related Art Recently, there has been a demand for further downsizing of an ignition coil for an internal combustion engine, and as a core structure thereof, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-335523,
2. Description of the Related Art A columnar core having a substantially circular cross section formed by laminating a plurality of magnetic steel plates having different widths is known. This publication aims to improve the voltage conversion efficiency and reduce the manufacturing cost, so that the space factor is 90% as a result.
The thickness and width of each of the plurality of magnetic steel plates are specified, and the number of stacked layers is specified.

[0003]

Problems to be Solved by the Invention JP-A-8-33 mentioned above
In the 5523 publication, a cutting step of cutting a steel sheet material to produce a ribbon material, a bundling step of bundling the ribbon material to produce a laminated material, a cutting step of cutting the bundled laminated material into a core material of a predetermined length, and A manufacturing process of an iron core material including a laser welding process of YAG laser welding the cut end of the iron core material is disclosed. In the publication, regarding a plurality of magnetic steel sheets, the thickness and width of each steel sheet are specified,
Although the number of stacks is specified, these values set the space factor to 9
If the target value of 0% is set, it is inevitably obtained, and it can be said that the target value is a design value which is necessarily determined from the size and shape of the target ignition coil.

[0004] Rather, in the manufacturing process of the iron core material, burrs are formed on each steel sheet when the steel sheet material is cut, and there is a concern that the diameter is increased due to the presence of burrs between the steel sheets when the respective steel sheets are laminated. . In the cutting step described in the publication, it is described that the steel sheet material is cut into a goodwill shape by the cutting rollers engaging with each other. Accordingly, burrs are formed in the cut portions at both ends of each ribbon material manufactured by this, and the burrs are in the opposite directions to each other in the adjacent ribbon materials. Then, in the bundling step, the ribbon material cut in a good shape is bound while twisting, and the ribbon material having the narrowest width is arranged on the outer side, and the ribbon material gradually increasing in width is sequentially arranged on the inner side. It is described that they are arranged and laminated by a bundling machine such that the widest ribbon material is located at the center.

As a result, the burrs formed at both ends of each ribbon material are laminated so as to face each other, and a gap is formed between the ribbon materials facing each other by the burrs. For this reason, it is difficult to form the laminated material to a predetermined diameter, and it is necessary to take measures such as setting a separate deburring step, which results in an increase in cost. In addition, as a post-process of the bundling step, the sheet cannot be conveyed only by the guide roller, so a separate conveying means is required, and a holding means after the lamination is also necessary.

In the above-mentioned cutting step, since a laminated material is manufactured by bundling ribbon materials obtained by cutting a steel plate material, a structure in which plate materials having different thicknesses are laminated cannot be formed. The upper limit of the space factor depends on one steel sheet material to be selected, and a significant improvement in the space factor cannot be expected due to the relationship with the number of laminated sheets. Furthermore, in the above-mentioned cutting step, it is described that the laminated material fixed to the die and the pressing die is subjected to shearing by a punch that moves in the radial direction. This may cause a problem that the end face becomes rough and burrs are formed on a part of the end face, which requires post-processing. Moreover, in order to cut a laminated material having a circular cross section by shearing, it is necessary to accurately grip the laminated material so that the shearing direction is perpendicular to the plate surface, which is not easy, which is a factor that increases costs. Become.

Therefore, the present invention provides an ignition coil core formed by laminating a plurality of magnetic plates to form a column.
An object of the present invention is to provide a core having a laminated structure that can be surely set to a predetermined diameter.

Another object of the present invention is to provide a method of manufacturing a core for an ignition coil in which a core having a substantially circular cross section having a predetermined diameter can be easily and inexpensively formed by laminating a plurality of magnetic plates. Make it an issue.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an ignition coil core in which a plurality of magnetic plates having different widths are laminated to form a columnar shape. A first plate having a substantially semicircular cross-section formed by cutting to form a plurality of magnetic plates having different widths, and laminating the plurality of plates in the same cutting direction in the order of increasing width of each plate;
And a second portion having a substantially semicircular cross-section formed by laminating the plurality of plate materials having the same cutting direction in the order of decreasing width of each plate material, and the second portion and the second First
Is a laminate having a substantially circular cross-section formed in contact with the surface of each maximum width.

[0010] The plurality of plate members may be configured so as to have mutually different plate thicknesses.

According to a third aspect of the present invention, there is provided a method of manufacturing a core for an ignition coil, comprising cutting a flat plate of a magnetic material to form a plurality of magnetic material strips having different widths. Each of the strips is cut to a predetermined length to form a plurality of magnetic plates having different widths, and the plurality of plates are arranged so that the cutting direction of each plate is the same, and the width of each plate is increased. In addition, the plate members may be stacked so that the cutting directions of the plate members are the same, and the plate members may be stacked in the order of decreasing width to form a laminate having a substantially circular cross section.

[0012] In the manufacturing method according to the third aspect, a band forming step of cutting a flat plate of the magnetic body to form a plurality of bands of a magnetic body having different widths; A band material winding step, and a band material cutting step of drawing out the plurality of band materials from the plurality of coils and cutting each to a predetermined length to form a plurality of magnetic material plate members having different widths, The plurality of plate members are arranged so that the cutting direction of each plate member is the same, and are stacked in the order of increasing the width of each plate member, and are arranged such that the cutting direction of each plate member is the same, and the width of each plate member is reduced. And a plate material laminating step of laminating them in this order to form a laminate having a substantially circular cross section.

Further, as a method of manufacturing a core for an ignition coil according to the present invention, a plurality of magnetic plates having different widths and thicknesses are obtained by cutting a plurality of flat plates of a plurality of magnetic materials having different thicknesses. Forming a plurality of strips of a magnetic body having different widths and thicknesses by cutting the plurality of strips into predetermined lengths, respectively, and cutting the plurality of strips in a cutting direction of each of the strips; Are arranged in the same order and stacked in the order of increasing the width of each plate, and arranged so that the cutting direction of each plate is the same and stacked in the order of decreasing the width of each plate. It may be formed on the body.

A manufacturing method according to a fourth aspect of the present invention is a strip material forming step of cutting a plurality of magnetic material strips having different thicknesses to form a plurality of magnetic material strips having different widths and thicknesses. A band winding step of winding the plurality of bands around a plurality of coils, and extracting the plurality of bands from the plurality of coils and cutting each of the plurality of bands to a predetermined length to form a plurality of bands having different widths and thicknesses. A strip cutting step for forming a magnetic material plate, and the plurality of plates are arranged so that the cutting direction of each plate is the same and stacked in the order of increasing width of each plate, and the cutting direction of each plate is changed. A plate material laminating step of arranging them so as to be identical and laminating them in the order of decreasing width of each plate material to form a laminate having a substantially circular cross section can be employed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an ignition coil core according to the present invention will be described below with reference to the drawings. FIG. 1 shows a laminated structure of an inner core as one embodiment of an ignition coil core of the present invention, and FIGS. 2 and 3 show an ignition coil for an internal combustion engine provided with the inner core of FIG. First, the overall configuration of the ignition coil for an internal combustion engine will be described. In FIG. 3, a housing 60 includes a lower case 61 and an upper case 6.
2 is a synthetic resin container-shaped housing to which the cylindrical upper end of the lower case 61 is fitted into the cylindrical lower end of the upper case 62. The upper end of the upper case 62 is a housing in which the igniter 8 is housed.

As shown in FIG. 3, the lower case 61 houses the primary coil 12 and the secondary coil assembly 20, and the outer core 30 is mounted inside the lower case 61. A high-voltage terminal is formed continuously at the lower end of the lower case 61, and the high-voltage terminal 7 is built in the terminal. A plug cap 70 formed of an insulating material (for example, rubber) into a cylindrical shape is provided outside the high-voltage terminal 7. Is installed.

The outer core 30 is made of a silicon steel plate as shown in FIG.
Is formed in a cylindrical shape, and is fitted inside the lower case 61 of the housing 60. The primary coil 12 is fitted in the lower case 61 with the winding wound in two or four layers. An insulating film 40 having a releasability from an insulating material such as an epoxy resin is provided so as to cover the inner surface of the primary coil 12 and extend in the axial direction above and below the primary coil 12.

As shown in FIG. 2 and FIG. 3, the secondary coil assembly 20 has a secondary coil 22 wound around a secondary bobbin 21, and the core assembly 1 is accommodated in a hollow portion of the secondary bobbin 21. A plurality of protrusions are formed on the inner surface of the lower end of the secondary bobbin 21, and the core assembly 1 is supported by these protrusions. The core assembly 1 includes a long cylindrical inner core 10, a pair of cylindrical permanent magnets (represented by 50) and a pair of elastic members (represented by 3) covered by a heat-shrinkable tube 2. Become composed.

As shown in FIG. 1, the inner core 10 is formed by cutting a flat plate of a silicon steel plate to form a plurality of plate members M1 to M26 having different widths (part of reference numerals are omitted in FIG. 1), and the cutting directions are the same. A first portion 10a having a substantially semi-circular cross section laminated in the order of increasing width of each plate material, and a second portion having a substantially semi-circular cross section laminated in the same cutting direction and decreasing width of each plate material. The first and second portions 10a and 10b are formed in a laminate having a substantially circular cross-section that abuts on the surface of the maximum width. Burrs B1 and B2 shown in FIG. 1 are formed at both ends of the plate materials M1 to M26 in the width direction at the time of cutting. However, since the widths of the respective plate materials are different, the burrs B1 , B2 do not abut against the plate surfaces of adjacent plate members. Therefore, the adjacent plate members are joined in a state of close contact without forming a gap due to the burrs B1 and B2.

As shown in FIG. 3, permanent magnets 50 are disposed on the inner core 10 having the above-described structure so as to contact the end faces of both ends in the axial direction, and an elastic member is provided on the outermost end. 3 is attached. A pair of permanent magnets 50
Are arranged so that the directions of the generated magnetic fluxes are the same direction and opposite to the direction of the magnetic flux formed in the inner core 10 when the primary coil 12 is energized, and the inner core 10, the permanent magnet 50, and the outer core 30 constitutes a magnetic circuit.

The secondary bobbin 21 is a resin cylindrical body having a plurality of flanges (represented by 21a) at predetermined intervals in the axial direction, and a plurality of flanges formed between these flanges 21a. The winding of the secondary coil 22 is wound in the annular groove section. As shown in FIG. 3, a secondary terminal 18 is supported on the upper end of the secondary bobbin 21, and the low voltage side of the secondary coil 22 is connected to this. That is, the secondary coil 2
The end on the low voltage side of the second winding is wound several times around the upper end of the secondary bobbin 21 and then wound around the base end of the secondary terminal 18. On the other hand, a secondary terminal 17 on the high-pressure side is mounted at the lower end of the secondary bobbin 21. Further, a connector portion is formed integrally with the upper case 62, and a plurality of connector terminals (represented by 63) are arranged in parallel with the connector portion. The base ends of these connector terminals 63 are connected to the igniter 8 so that the power supply to the primary coil 12 is intermittently controlled.

In manufacturing and assembling the ignition coil having the above configuration, first, an inner core 10 including a plurality of plate members M1 to M26 shown in FIG. 1 is formed by a method described later. Permanent magnets 50 are arranged at both ends of the inner core 10 in the axial direction, and the elastic member 3 is attached to the outermost end. The inner core 10, the permanent magnet 50 and the elastic member 3 are accommodated in the heat-shrinkable tube 2. Secondary terminals 17 and 18 are mounted on both ends of the secondary bobbin 21, and a secondary coil 22 is wound around the secondary bobbin 21,
The winding of the secondary coil 22 is electrically connected to the secondary terminals 17 and 18. Then, the core assembly 1 configured as described above is housed in the hollow portion of the secondary bobbin 21 to form the secondary coil assembly 20.

On the other hand, the outer core 30 is formed in a cylindrical shape from a silicon steel plate, and is press-fitted inside the lower case 61 of the housing 60. Further, the primary coil 12 is accommodated in the lower case 61, and the insulating film 40 is disposed inside the primary coil 12. Then, the secondary coil assembly 20 is housed in the housing 60 and the housing 6
When the high-voltage terminal 7 is press-fitted into the high-voltage terminal unit 0, it is electrically connected to the secondary terminal 17. Also,
The igniter 8 is housed in the upper case 62 of the housing 60, the winding end of the primary coil 12 is connected to the igniter 8, and the winding start is connected to the connector terminal 6.
3 is connected. Thus, the low voltage side of the winding of the secondary coil 22 is connected to the igniter 8 via the secondary terminal 18, and the high voltage side is connected to the high voltage terminal 7 via the secondary terminal 17.

The lower case 61 assembled as described above.
Is fitted to the upper case 62. Then, a gap in the housing 60 is filled with a thermoplastic insulating material such as an epoxy resin and cured, so that the insulating portion 13 is formed in the housing 60 as indicated by stippling in FIG. As a result, the primary coil 12 and the secondary coil 22 are impregnated and fixed, the electrical connection portion is appropriately insulated, and the electrical insulation that can withstand the output high voltage of the secondary coil 22 is secured.

Next, a method of manufacturing the inner core 10 will be described. FIG. 4 is a plan view showing an outline of this manufacturing process. In this embodiment, prior to the process of FIG. 4, a plurality of flat plates of magnetic material, that is, a plurality of strips having different widths are cut by cutting a silicon steel plate into strips. There is a band forming step (not shown) for forming S1 to S26, and a band winding step (not shown) for winding a plurality of bands S1 to S26 around a plurality of coils R1 to R26. Then, the plurality of strips S1 to S26 (partially omitted in FIG. 4) formed in the strip winding step are cut into predetermined lengths, respectively, and a plurality of plate materials M1 to M1 of the same length having different widths. A strip material cutting step of forming M26 and a plate material laminating step of laminating a plurality of plate materials M1 to M26 to form a laminate having a substantially circular cross section are performed. Welded by YL. The arrows in FIG. 4 indicate the transport direction of the plate materials M1 to M26 and the inner core 10, and the white arrows indicate the stacking order. That is, a plate member (eg, M2) located below is sequentially laminated on a plate member (eg, M1) located above in FIG.
Both end surfaces are laser-welded to form the inner core 10 located at the lowermost position.

FIGS. 5 to 11 show an example of an apparatus used for manufacturing the inner core 10 described above.
Separately, a plurality of silicon steel plates are cut into strips in a strip forming step to form a plurality of strips S1 to S26 having different widths. Further, in a strip winding step, these strips are respectively formed into a plurality of coils R1 to R26. It is wound. FIG. 5 shows the entire configuration of the manufacturing apparatus, FIG. 6 shows an apparatus used for a strip cutting process for forming a strip from a silicon steel sheet, that is, a strip, and FIG. Is shown. FIG.
FIG. 7 shows a strip cutting process for one coil R1 and a lamination process for one plate material M1. The remaining coils R2 to R26 and the plate materials M2 to M26 are processed in the same manner. 8 to 11 show the transport state in the laminating step, and the rightward direction in FIGS. 8 to 11 is shown in FIGS.
Corresponds to the bottom.

First, a transfer bar TB extends in the vertical direction of FIG. 5, and a coil R1, a feeder FD, a press device CT, a lifting device LD, LU, a rotary magazine RM, and a transfer device FT are perpendicular to the transfer bar TB. It is juxtaposed. Similarly, devices are arranged in parallel for the coils R2 to R26. Note that, in FIG. 5, the right coil R2 and the like are omitted, and devices subsequent to the coil R12 are also omitted. Each of the above devices will be described below with reference to FIGS.

In FIG. 6 relating to the strip cutting step, a strip S1 is shown.
The coil R1 around which is wound is supported rotatably by the support device ST, and the strip S1 is guided by the leveler LV, and is supplied to the press device CT by the feeder FD at predetermined intervals. The strip material S1 is cut into a predetermined length by the press device CT to form a plurality of plate materials M1.
D. When a predetermined amount of the plate material M1 is stocked, the elevating device LD descends, and the rotary magazine RM (FIG. 5)
) Is mounted on a turntable.

Then, by the rotation of the rotary magazine RM, the plate material M1 is transferred onto the lifting device LU shown in FIG.
The lifting of the lifting device LU and the horizontal movement of the transfer device FT (FIG. 5) cause the plate materials M1 to be carried one by one to the fixing jig BS as shown by the white arrows in FIG. 7, and both ends of the plate material M1 are fixed to the fixing jig BS. Are accommodated and supported in the recess BR. Fixing jig B
The recess BR of S is formed in a U-shape corresponding to the outer shape of the inner core 10 of the finished product as shown in FIG. 9, and the plate material M1 has the bottom surface of the recess BR at both ends as shown in FIGS. 8 and 9. It is supported by. On the other hand, a transfer bar TB is arranged below the plate material M1, and a chuck C1 shown in FIG. 9 and a chuck C2 shown in FIG. 11 are supported on the transfer bar TB. The transfer bar TB is driven back and forth and up and down as shown by arrows in FIGS. 9 and 11, and the plate material M is attached to the next adjacent fixing jig BS.
1 and the like are sequentially transferred.

That is, in FIG. 8 and FIG. 9, after the plate material M1 is supported by the fixing jig BS, the transfer bar TB
Is driven upward, the chuck C1 rises, and the plate material M1 is supported by the chuck C1. In this state, the next stage fixing jig BS
When the transfer bar TB is driven downward after moving to the right to the upper side, the plate material M1 is separated from the chuck C1 and is supported by the concave portion BR of the fixing jig BS of the next stage. Chuck C
1 is formed in a U-shape similar to the recess BR of the fixing jig BS as shown in FIG.

On the other hand, in FIGS. 10 and 11, for example, at the stage where the plate material M15 is supported by the fixing jig BS, the cross section of the laminate is in the process of being formed from a semicircle to a circle.
When the transfer is performed by the chuck C1 in FIGS. 8 and 9, the stacked shape is broken during the transfer operation, and it becomes difficult to maintain the plate surface of the stacked body horizontally. Therefore, at this stage, a chuck C2 having a gripping function configured to allow a pair of arms having a U-shaped concave portion to move toward and away from each other is used. That is, when the chuck C2 is driven from the open state shown by the solid line in the lower left part of FIG. 9 to the state shown by the two-dot chain line in the upper left part, the stacked body such as the plate material M15 is gripped from the left and right directions by the chuck C2. When the chuck C2 is driven from the gripping state shown by the two-dot chain line in the upper right part of FIG. 9 to the state shown by the two-dot chain line in the right middle part, the laminate such as the plate material M15 is released from the gripping state by the chuck C2. Are left on the fixing jig BS. In this manner, the plate materials M1 and the like are conveyed downward in FIG. 5 while being sequentially stacked.

As described above, in the present embodiment, a plurality of plate members M1 to M26 having different widths are formed separately from a plurality of band members S1 to S26 having different widths, and the respective plate members are separately and sequentially laminated. With such a configuration, the plate members can be laminated so that the burrs B1 and B2 of the plate members project in the same direction. Thus, as shown in FIG. 1, the first portions 10a having substantially semi-circular cross sections stacked in the order in which the burrs B1 and B2 project in the same direction and the width of each plate material increases.
And the second portion 10b having a substantially semi-circular cross-section that is stacked in the order in which the burrs B1 and B2 project in the same direction and the width of each plate material decreases, so that the inner core 10 can be formed easily and reliably. . In addition, as described above, the inner core 1 can be formed with a simple device without using an expensive progressive device.
Since 0 can be formed, the cost can be reduced. After the first portion 10a and the second portion 10b are separately formed, the inner core 10 may be formed by joining the surfaces having the maximum widths to each other.

FIG. 12 shows an end face of an inner core 10 according to another embodiment of the present invention. The plate thicknesses of the respective plates constituting the inner core 10 of the above-described embodiment are the same as those of this embodiment. In this case, the sheet thickness is different for each sheet material to improve the space factor. That is, a plurality of flat plates of a plurality of silicon steel plates having different plate thicknesses are cut into strips to form a plurality of strips having different widths and plate thicknesses, and these are cut to form a plurality of strips having the same lengths having different widths and plate thicknesses. The plate materials M1 to M26 are formed. In FIG. 12, the same reference numerals as those in FIG. 1 are used for the same reference numerals.

Then, in the same manner as in the above-described embodiment,
As shown in FIG. 12, the inner core 10 has a first portion 10a having a substantially semicircular cross section in the same cutting direction and stacked in the order of increasing the width of each plate, and the width of each plate decreases in the same cutting direction. Having a substantially semicircular cross-section stacked in the order
Is formed, and the first and second portions 10a, 10a,
10b are formed in a laminate having a substantially circular cross-section that abuts on each largest width surface. Also at this time, burrs B1 and B2 are formed at both ends in the width direction of the plate materials M1 to M26, respectively, at the time of cutting, but the burrs B1 and B2 do not abut on the plate surfaces of the adjacent plate materials, and are in close contact with each other. Joined. The inner core 10 of the present embodiment can also be formed by the same method as the manufacturing method of the above-described embodiment.
After the portions 10b are separately formed, the inner core 10 may be formed by joining the surfaces having the maximum widths to each other.

[0035]

Since the present invention is configured as described above, the following effects can be obtained. That is, in the ignition coil core according to the first aspect, since a plurality of magnetic plate members having different widths are stacked in a predetermined order with the same cutting direction of each plate member, the burrs protruding direction of each plate member. Are the same,
Each plate material is adhered and joined. Therefore, the core can be easily and reliably formed into a substantially circular cross section having a predetermined diameter.

Further, in the ignition coil core according to the second aspect, the space factor can be further increased because the ignition coil core is formed in a substantially circular cross section by a plurality of plate members having not only a width but also a plate thickness. , Further downsizing becomes possible.

In the method of manufacturing an ignition coil core according to a third aspect of the present invention, a plurality of plate members having different widths are arranged so that the cutting directions of the respective plate members are the same, and a substantially circular cross section is formed in a predetermined order. Since the burrs of the respective plate members project in the same direction and are closely bonded to each other, a core having a substantially circular cross section having a predetermined diameter can be easily and reliably formed. . In addition, since the core can be formed with a simple device without using an expensive progressive device, the cost can be reduced.

Further, when a plurality of plate members having different widths and plate thicknesses are used as in the method of manufacturing an ignition coil core according to the fourth aspect, the ignition coil core having a larger space factor can be obtained. Can be manufactured.

[Brief description of the drawings]

FIG. 1 is a plan view of an inner core according to an embodiment of an ignition coil core of the present invention.

2 is a cross-sectional view of an internal combustion engine ignition coil having an inner core according to one embodiment of the present invention, and is a cross-sectional view taken along line AA of FIG. 3;

FIG. 3 is a longitudinal sectional view of an internal combustion engine ignition coil including an inner core according to an embodiment of the present invention.

FIG. 4 is a plan view illustrating a manufacturing process of the inner core according to the embodiment of the present invention.

FIG. 5 is a plan view showing an overall configuration of a manufacturing apparatus provided for manufacturing an ignition coil core of the present invention.

FIG. 6 is a side view of an apparatus for performing a strip cutting step of forming a strip from a strip of silicon steel sheet in one embodiment of the present invention.

FIG. 7 is a side view showing an outline of an apparatus provided for a step of laminating plate materials in one embodiment of the present invention.

FIG. 8 is a plan view showing a transport state in the first half of the laminating step according to one embodiment of the present invention.

FIG. 9 is a side view showing a transport state in the first half of the laminating step according to the embodiment of the present invention.

FIG. 10 is a plan view showing a transport state in the latter half of the laminating step in one embodiment of the present invention.

FIG. 11 is a side view showing a transport state in the latter half of the laminating step in one embodiment of the present invention.

FIG. 12 is a plan view of an inner core according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 core assembly 10 inner core 12 primary coil 20 secondary coil assembly 21 secondary bobbin 22 secondary coil 30 outer core 50 permanent magnet 60 housing R1 to R26 coil S1 to S26 band material M1 to M26 plate material B1, B2 burr FD feeder CT press device LD, LU Lifting device TB Transfer bar C1, C2 Chuck BS Fixing jig

Claims (4)

[Claims] In an ignition coil core formed by laminating a plurality of magnetic plates having different widths to form a column, a plurality of magnetic plates having different widths are formed by cutting a flat plate of the magnetic material. A first semi-circular cross section formed by stacking the plurality of plate members having the same cutting direction in the order of increasing width of each plate member;
And a second portion having a substantially semicircular cross-section formed by laminating the plurality of plate materials having the same cutting direction in the order of decreasing width of each plate material, wherein the second portion and the first A core for an ignition coil, wherein the core is a laminated body having a substantially circular cross section formed by abutting each other on a plane having a maximum width. 2. The ignition coil core according to claim 1, wherein said plurality of plate members have mutually different plate thicknesses. 3. A plurality of magnetic material strips having different widths are formed by cutting a flat plate of the magnetic material, and the plurality of magnetic material strips are cut into predetermined lengths. Forming a plate,
The plurality of plate members are arranged so that the cutting direction of each plate member is the same, and are stacked in the order of increasing the width of each plate member, and are arranged so that the cutting direction of each plate member is the same, and the width of each plate member is reduced. A method for manufacturing a core for an ignition coil, comprising laminating in the order described above to form a laminate having a substantially circular cross section. 4. A plurality of magnetic material strips having different widths and thicknesses are formed by cutting flat plates of a plurality of magnetic materials having different thicknesses, and each of the plurality of strips is cut to a predetermined length. Forming a plurality of magnetic plates having different widths and thicknesses, and arranging the plurality of plates in such a manner that the cutting direction of each plate is the same and stacking the plates in the order of increasing width of each plate, A method for manufacturing a core for an ignition coil, comprising: arranging the plate members so that the cutting directions of the plate members are the same; and laminating the plate members in order of decreasing width to form a laminate having a substantially circular cross section.