JP5664283B2 - Ignition coil for internal combustion engine and method of manufacturing the same - Google Patents

Description

  The present invention relates to an ignition coil for an internal combustion engine used for generating a spark in a combustion chamber in an internal combustion engine such as an automobile engine and a method for manufacturing the same.

  An ignition coil used for an internal combustion engine includes a primary coil and a secondary coil in a core composed of a central core and an outer core, and a high voltage is applied to the secondary coil due to a change in magnetic flux when the energization to the primary coil is interrupted. Induces an electromotive force. Thereby, a spark is generated in the spark plug connected to the ignition coil.

In recent years, in order to improve the output voltage of the ignition coil, a magnetic bias is applied to the central core to increase the amount of magnetic flux change and increase the voltage induced in the secondary coil. A coil is disclosed (Patent Document 1).
The ignition coil is formed by embedding components such as a core in a filler in a case in order to prevent core rust.

JP 2001-196248 A

  However, when assembling the ignition coil, if the magnet body is assembled in the course of assembling the component parts, metal foreign matter such as iron powder may be attached to the magnet body during the manufacturing process. In that case, the magnetic attractive force of the magnet body is strong, and it is difficult to remove the metal foreign matter by air blow or the like. Moreover, if a magnet body is assembled | attached to a core, a core will also be magnetized by a magnet body and there exists a possibility that a metal foreign material may adhere also to a core. Then, in the filling material injection step after the assembly of the component parts into the case, the metallic foreign matter adhering to the magnet body and the like diffuses throughout the filling material as the filling material is injected. As a result, the voltage of the ignition coil may leak internally.

To solve this problem, the assembly of the magnet body is performed after assembling components other than the magnet body and removing metal foreign objects by air blow or the like, immediately before filling the filler into the case. It is conceivable to reduce the possibility of mixing in the metal foreign matter by performing the work.
However, when the assembly of the magnet body is inserted and arranged in a magnetic circuit between the outer core and the central core in the core, the magnet body is attracted to the outer core or the central core, and the magnet body is Hard to insert. And if it inserts forcibly, it will be easy to insert in the state in which the magnet body inclined diagonally, and there also exists a possibility that a crack may arise in a magnet body.

  The present invention has been made in view of the above problems, and provides an ignition coil for an internal combustion engine that can prevent internal leakage of a voltage due to mixing or diffusion of a metal foreign object and can smoothly assemble a magnet body, and a method for manufacturing the same. It is something to be offered.

A first invention comprises a central core made of a soft magnetic material,
A primary coil and a secondary coil in which the central core is arranged penetrating on the inner peripheral side;
The pair of opposed portions formed with opposed surfaces facing the pair of end surfaces at both ends of the central core in the penetrating direction are connected to the pair of opposed portions, and on the outer peripheral side of the primary coil and the secondary coil. An outer peripheral core made of a soft magnetic material integrally provided with a connecting portion to be arranged;
A magnet body disposed between at least one of the end surfaces of the central core and the facing surface of the outer peripheral core;
A guide member made of an insulator that guides the magnet body so as to surround the magnet body from three directions orthogonal to the penetrating direction;
Between the guide member, the end surface, and the facing surface, an accommodation recess having an opening that is open in a direction orthogonal to the penetrating direction and in which the connecting portion is not disposed is formed.
One of the end portion of the central core and the facing portion of the outer peripheral core facing each other across the housing recess protrudes in the opening direction of the housing recess with respect to the other and the end surface or the facing have a protruding portion with a slide surface serving as a surface flush,
In the ignition coil for an internal combustion engine, the end portion or the facing portion provided with the projecting portion is engaged with the guide member .

A second invention comprises a central core made of a soft magnetic material,
A primary coil and a secondary coil in which the central core is arranged penetrating on the inner peripheral side;
The pair of opposed portions formed with opposed surfaces facing the pair of end surfaces at both ends of the central core in the penetrating direction are connected to the pair of opposed portions, and on the outer peripheral side of the primary coil and the secondary coil. An outer peripheral core made of a soft magnetic material integrally provided with a connecting portion to be disposed; and a clearance formed between at least one end face of the central core and the opposing surface of the outer core. And a guide member made of an insulator that guides so as to surround from three directions orthogonal to each other, and between the guide member, the end surface, and the facing surface, a direction orthogonal to the penetration direction, Forming a sub-assembly in which an accommodation recess having an opening that opens in a direction in which the connecting portion is not disposed,
One of the end portion of the central core and the facing portion of the outer peripheral core facing each other across the housing recess protrudes in the opening direction of the housing recess with respect to the other, and the end surface or the facing It has a protrusion with a slide surface that is flush with the surface,
The end portion or the facing portion provided with the protruding portion is engaged with the guide member,
In placing the magnet body through the opening in the housing recess in the sub-assembly,
A part of one surface of the magnet body is brought into surface contact with the slide surface of the protrusion,
Next, the magnet body is slid toward the side opposite to the opening direction along the end face or the opposed face that is flush with the slide surface, and the magnet body is inserted and disposed in the housing recess. A feature of the present invention resides in a method of manufacturing an ignition coil for an internal combustion engine.

  In the ignition coil for an internal combustion engine according to the first aspect of the present invention, the accommodating recess having the opening is formed between the guide member, the end surface of the central core, and the facing surface of the outer peripheral core. Thus, when assembling the ignition coil, after assembling the primary coil, secondary coil, central core, outer peripheral core, and guide member, that is, in the final stage of assembling the ignition coil, the magnet body is assembled. Is possible. That is, in the final stage of assembling the ignition coil, the magnet body can be inserted into the housing recess through the opening. Therefore, it is possible to prevent the metallic foreign matter adhering to the magnet body or the like from being mixed or diffused into the ignition coil.

The ignition coil protrudes in the opening direction of the housing recess with respect to the other of the end of the central core and the facing portion of the outer core facing each other across the housing recess. And a protrusion having a slide surface that is flush with the end surface or the facing surface.
Thus, when the magnet body is inserted, one surface of the tip of the magnet body is brought into surface contact with the slide surface of the protrusion, and the magnet body is slid along the slide surface toward the opposite side of the opening direction. Can be made. Therefore, the magnet body can be inserted and disposed in the housing recess while being in a state parallel to the end surface and the facing surface. Thereby, the said magnet body can be smoothly inserted and arranged in the said accommodation recessed part. And the crack of the said magnet body can be prevented.

In the method for manufacturing an ignition coil for an internal combustion engine according to a second aspect of the invention, the central core, the primary coil, the secondary coil, the outer peripheral core, and the guide member are assembled to each other, and the guide member and the above A sub-assembly is formed between the end surface and the facing surface. The sub-assembly includes an accommodation recess including an opening that is open in a direction perpendicular to the penetrating direction and in which the connecting portion is not disposed.
Thus, when assembling the ignition coil, after assembling the sub-assembly,
The magnet body can be assembled. That is, in the final stage of assembling the ignition coil, the magnet body can be inserted into the housing recess through the opening. Therefore, it is possible to prevent the metallic foreign matter adhering to the magnet body or the like from being mixed or diffused into the ignition coil.

In addition, the sub-assembly has the protruding portion at either one of the end portion of the central core and the facing portion of the outer peripheral core. Then, when the magnet body is inserted and arranged in the housing recess from the opening, a part of one surface of the magnet body is brought into surface contact with the slide surface of the protrusion, and then the end surface or The magnet body is slid along the facing surface toward the side opposite to the opening direction.
Accordingly, the magnet body can be inserted and disposed in the housing recess while being in a state parallel to the end surface and the facing surface. Thereby, the said magnet body can be smoothly inserted and arranged in the said accommodation recessed part. And the crack of the said magnet body can be prevented.

  As described above, according to the present invention, it is possible to provide an internal combustion engine ignition coil and a method for manufacturing the same that can prevent internal leakage of a voltage due to the mixing or diffusion of a metal foreign object and can smoothly assemble a magnet body. .

Sectional drawing seen from the front of the ignition coil in Example 1. FIG. FIG. 3 is a bottom view of a subassembly in the ignition coil according to the first embodiment. FIG. 3 is a cross-sectional view of the sub assembly viewed from the front according to the first embodiment. 3 is a perspective view of a guide member in Embodiment 1. FIG. FIG. 3 is a perspective view of an outer peripheral core in the first embodiment. Sectional drawing seen from the front of the ignition coil arrange | positioned in the plug hole of the engine in Example 1. FIG. Explanatory drawing by the cross section of the arrangement | positioning process of the magnet body of a sub assembly in Example 1. FIG. Sectional drawing of the subassembly after arrangement | positioning of the magnet body in Example 1. FIG. Explanatory drawing by the cross section of the arrangement | positioning process to the case of a sub assembly in Example 1. FIG. The perspective view of the outer periphery core in Example 2. FIG. Sectional drawing seen from the front of the sub assembly in Example 2. FIG. Sectional drawing of the ignition coil which formed the protrusion part in the edge part side of the center core in Example 3. FIG.

  1st invention WHEREIN: The said outer periphery core is good also as a frame shape which has the said 2 connection part which connects the said pair of opposing part in each both ends, for example, and a pair of said opposing part is each one end. The shape which has one said connection part connected in may be sufficient. That is, it is only necessary that a closed magnetic path can be formed by the central core and the outer peripheral core.

  The opening direction of the housing recess is a direction perpendicular to the direction in which the connecting portion is disposed, the facing portion of the outer peripheral core includes the protruding portion, and the outer core extends in the opening direction. It preferably has a shape with a constant height (claim 2). In this case, the protruding portion can be easily formed by, for example, assembling the outer peripheral core and the central core in an offset state without providing a portion protruding from the other portion at the opposing portion of the outer peripheral core. can do.

  The guide member is preferably formed integrally with a connector portion for electrically connecting the primary coil to the outside. In this case, the number of parts can be reduced, and the manufacturing cost of the ignition coil can be reduced.

  2nd invention WHEREIN: The opening direction of the said accommodation recessed part is a direction orthogonal to the direction where the said connection part is arrange | positioned, The said opposing part of the said outer periphery core is equipped with the said protrusion part, The said outer periphery core is the following. It is preferable to have a shape in which the height in the opening direction is constant. In this case, the protruding portion can be easily formed by, for example, assembling the outer peripheral core and the central core in an offset state without providing a portion protruding from the other portion at the opposing portion of the outer peripheral core. can do.

  The guide member is preferably integrally formed with a connector portion for electrically connecting the primary coil to the outside. In this case, the number of parts can be reduced, and the manufacturing cost of the ignition coil can be reduced.

Example 1
An ignition coil for an internal combustion engine according to an embodiment of the present invention and a manufacturing method thereof will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the ignition coil 1 of the present example includes a central core 21 and an outer peripheral core 24 made of a soft magnetic material, and a primary coil 22 and a secondary coil in which the central core 21 is arranged to penetrate on the inner peripheral side. 23.

  The outer peripheral core 24 connects the pair of facing portions 242 and the pair of facing portions 242 respectively formed with facing surfaces 241 facing the pair of end surfaces 211 at both end portions 212 of the central core 21 in the penetrating direction, and the primary coil 22 and A connecting portion 243 disposed on the outer peripheral side of the secondary coil 23 is integrally provided.

The magnet body 3 is disposed between at least one end surface 211 of the central core 21 and the facing surface 241 of the outer peripheral core 24.
The ignition coil 1 includes a guide member 4 made of an insulator that guides the magnet body 3 so as to surround the magnet body 3 from three directions orthogonal to the penetrating direction.
The central core 21, the outer peripheral core 24, the primary coil 22, the secondary coil 23, the magnet body 3, and the guide member 4 are provided in the case 11.

  As shown in FIGS. 1 and 2, an opening that opens in a direction perpendicular to the penetrating direction and where the connecting portion 243 is not disposed is provided between the guide member 4, the end surface 211, and the facing surface 241. An accommodation recess 40 having 41 is formed.

  As shown in FIGS. 1 and 2, one of the end portion 212 of the central core 21 and the facing portion 242 of the outer peripheral core 24 facing each other with the housing recess 40 interposed therebetween A protruding portion 5 is formed that protrudes in the opening direction and includes a slide surface 50 that is flush with the end surface 211 or the opposing surface 241. In this example, as shown in FIGS. 1 and 2, the protruding portion 5 is formed on the facing portion 242 of the outer peripheral core 24.

  As shown in FIGS. 2 and 5, the outer peripheral core 24 is a substantially short frame that opens in a direction orthogonal to the axial direction of the central core 21, and a pair of sides facing each other are respectively formed by opposing portions 242. The other pair of sides that are configured and face each other is configured by the connecting portion 243.

As shown in FIGS. 1 and 2, the pair of connecting portions 243 are arranged in parallel to the axial direction of the central core 21 and face the secondary coil 23 from the outside.
Further, the pair of facing portions 242 are arranged in parallel to the both end surfaces 211 of the central core 21 and face the both end surfaces 211, respectively. The one facing portion 242 is disposed in contact with the one end surface 211, but the other facing portion 242 is disposed facing the other end surface 211 in a state where a clearance is formed. In this way, the central core 21 and the primary coil 22 and the secondary coil 23 wound around the central core 21 are arranged inside the outer peripheral core 24.

  Moreover, the primary coil 22 and the secondary coil 23 are coaxially arranged on the inner and outer circumferences. The primary coil 22 is formed by directly winding a primary wire around the outer periphery of the central core 21, and the secondary coil 23 is formed on a resin spool 25 on the outer peripheral side of the primary coil 22. It is wound more times than the primary wire.

  As shown in FIG. 5, the outer peripheral core 24 has a constant height in the opening direction at the pair of connecting portions 243 and one opposing portion 242. And the convex part 244 which protruded to the one side of the opening direction rather than the other part is formed in a part of other opposing part 242, and this convex part 244 becomes the above-mentioned protrusion part 5. FIG.

As shown in FIG. 3, the facing portion 242 provided with the protruding portion 5 is engaged with the guide member 4. That is, as shown in FIG. 4, the guide member 4 includes a fitting locking portion 42 having a holding opening (not shown) that penetrates and holds one end portion 212 of the central core 21, and the fitting locking portion 42. On the other hand, it has two locking pieces 43 arranged opposite to the side opposite to the central core 21 side.
A concave locking portion 44 is formed between the fitting locking portion 42 and the two locking pieces 43 so that the facing portion 242 is inserted and disposed.

Then, while the end portion 212 of the central core 21 is held by the fitting locking portion 42 and the facing portion 242 of the outer core 24 is disposed in the concave locking portion 44 as shown in FIG. A housing recess 40 is formed between the fitting locking portion 42 and the central core 21.
As shown in FIG. 1, the magnet body 3 is disposed in the housing recess 40, and constitutes a part of the magnetic circuit between the outer peripheral core 24 and the central core 21.

  Further, as shown in FIGS. 1 and 3, the igniter 60 is formed of the pair of locking pieces 43 so as to face the surface opposite to the facing surface 241 in the facing portion 242 fitted and disposed in the concave locking portion 44. It is arranged in between.

The guide member 4 is integrally formed with the connector portion 6 for electrically connecting the primary coil 22 to the outside.
As shown in FIGS. 1 and 3, the connector portion 6 is formed so as to protrude from the guide member 4 to the opposite side of the central core 21 in parallel with the axial direction of the central core 21.

  As shown in FIG. 1, the central core 21, the primary coil 22, the secondary coil 23, the outer peripheral core 24, the spool 25, the magnet body 3, the igniter 60, and the guide member 4 are assembled as described above. It is arranged in a resin case 11 and is sealed by a filler 12 made of a thermoplastic resin. However, the connector part 6 formed integrally with the guide member 4 is exposed from the filler 12 and protrudes to the outside of the case 11.

  As shown in FIG. 1, the case 11 forms a high-voltage tower portion 111 in a direction orthogonal to the protruding direction of the connector portion 6. A conduction terminal 112 is disposed in the high voltage tower unit 111, and a high voltage terminal 26 that conducts a high voltage induced electromotive force of the secondary coil 23 is connected to the conduction terminal 112.

  As shown in FIG. 6, the ignition coil 1 of this example is used for an engine as an internal combustion engine, and is placed laterally outside the plug hole 82 of the engine (the primary coil 22 and the axial direction of the plug hole 82 and The secondary coil 23 is disposed in a state in which the winding axis directions thereof are orthogonal to each other. In addition, the ignition coil 1 of this example is attached to a spark plug 87 disposed in the plug hole 82 of the engine as shown in FIG.

Specifically, the conduction terminal 112 is electrically connected to the terminal portion 86 of the spark plug 87 by inserting the high voltage tower portion 111 into the plug hole 82 of the engine.
The high voltage tower portion 111 is formed by projecting a part of the case 11 and is a portion for covering a rubber plug cap 83. A coil spring 85 that is electrically connected to the high voltage terminal 26 is disposed in the plug cap 83.
The ignition coil 1 is attached to a spark plug 87 which is brought into contact with a coil spring 85 and a spark plug terminal portion 86 of the spark plug 87 in a plug cap 83 and screwed into a cinder head 89. .

As described above, the ignition coil 1 incorporates the igniter 60, and some of the terminals 61 of the igniter 60 are connected to the connector terminals 62 provided in the connector section 6, and some of the other terminals (not shown). ) Is connected to the primary coil 22.
The igniter 60 includes a switching control circuit that receives a command from an external device such as an ECU (engine control unit) and performs switching between energization of the primary coil 22 and its cutoff.
In the ignition coil 1 of this example, when the primary coil 22 is energized by the operation of the switching circuit of the igniter 60 in response to a command from the ECU, a magnetic field passing through the central core 21 and the outer core 24 is formed.

  Next, when the energization of the primary coil 22 is interrupted, a high voltage induced electromotive force is generated in the secondary coil 23 due to the mutual induction action, and the high voltage is generated between the pair of electrodes in the spark plug 87 attached to the ignition coil 1. A voltage can be generated.

Next, a method for manufacturing the ignition coil 1 of this example will be described with reference to FIGS. 3 and 7 to 9.
First, as shown in FIG. 3, the sub-assembly 7 is formed by assembling the central core 21, the primary coil 22 and the secondary coil 23, the outer peripheral core 24, and the guide member 4.

  In the sub-assembly 7, an accommodation recess 40 is formed between the guide member 4, the end surface 211, and the facing surface 241. As shown in FIG. 3, the end portion 212 of the central core 21 and the opposing portion 242 of the outer core 24 facing each other across the housing recess 40 are accommodated in the outer core 24. It protrudes in the opening direction of the recess 40. This is the protrusion 5 having the slide surface 50 described above.

  Next, as shown in FIG. 7, when the magnet body 3 is inserted into the housing recess 40 in the sub-assembly 7 and disposed from the opening 41, a part of one surface of the magnet body 3 is placed on the slide surface 50 of the projecting portion 5. Make surface contact.

  Next, the magnet body 3 is slid along the facing surface 241 that is flush with the slide surface 50 toward the side opposite to the opening direction, and the magnet body 3 is inserted and disposed in the housing recess 40 as shown in FIG. . At this time, one end of the magnet body 3 is brought into contact with the ceiling portion 410 in the housing recess 40 of the guide member 4.

Next, as shown in FIG. 9, the subassembly 7 in which the magnet body 3 is inserted and disposed in the housing recess 40 is disposed in the case 11. Finally, the filler 12 is poured into the case 11 and cured, thereby sealing the sub-assembly 7. In addition, a thermoplastic resin etc. are used for the filler 12 of this example.
The ignition coil 1 for the internal combustion engine of this example can be obtained by the above assembly process.

Next, the effect of the ignition coil 1 of this example and its manufacturing method will be described.
In the ignition coil 1 of this example, an accommodation recess 40 having an opening 41 is formed between the guide member 4, the end surface 211 of the central core 21, and the opposing surface 241 of the outer core 24. Thus, when the ignition coil 1 is assembled, the primary coil 22, the secondary coil 23, the central core 21, the outer peripheral core 24, and the guide member 4 are assembled in the case 11, that is, the final stage of the assembly of the ignition coil 1. Thus, the magnet body 3 can be assembled. That is, at the final stage of assembly of the ignition coil 1, the magnet body 3 can be inserted into the housing recess 40 through the opening 41. Therefore, it is possible to prevent the foreign metal adhering to the magnet body 3 or the like from being mixed or diffused into the ignition coil 1.

  In addition, the ignition coil 1 has a protruding portion 5 at one of the end portion 212 of the central core 21 and the facing portion 242 of the outer peripheral core 24 that face each other across the housing recess 40. Accordingly, when the magnet body 3 is inserted, one surface of the tip portion of the magnet body 3 is brought into surface contact with the slide surface 50 of the projecting portion 5, and the magnet body 3 is slid along the slide surface 50 toward the side opposite to the opening direction. Can be made. Therefore, the magnet body 3 can be inserted and disposed in the housing recess 40 while being parallel to the end surface 211 and the facing surface 241. Thereby, the magnet body 3 can be smoothly inserted and arranged in the housing recess 40. And the crack of the magnet body 3 can be prevented.

  Moreover, the guide member 4 of this example is integrally formed with the connector part 6 for electrically connecting the primary coil 22 to the outside. Thereby, the number of parts can be reduced, and the manufacturing cost of the ignition coil 1 can be reduced.

  Moreover, in the manufacturing method of the ignition coil 1 of this example, the center core 21, the primary coil 22, the secondary coil 23, the outer peripheral core 24, and the guide member 4 are assembled together, and the guide member 4 and the end surface 211 are combined. A sub assembly 7 is formed between the facing surface 241 and the housing recess 40 having an opening 41 that is open in a direction orthogonal to the penetrating direction and in which the connecting portion 243 is not disposed. Accordingly, when the ignition coil 1 is assembled, the magnet body 3 can be assembled after the subassembly 7 is assembled. That is, at the final stage of assembly of the ignition coil 1, the magnet body 3 can be inserted into the housing recess 40 through the opening 41. Therefore, it is possible to prevent the foreign metal adhering to the magnet body 3 or the like from being mixed or diffused into the ignition coil 1.

  Further, the sub-assembly 7 has the protruding portion 5 at one of the end portion 212 of the central core 21 and the facing portion 242 of the outer peripheral core 24. Then, when the magnet body 3 is inserted and arranged in the housing recess 40 from the opening 41, a part of one surface of the magnet body 3 is brought into surface contact with the slide surface 50 of the projecting portion 5, and then the end surface 211 or The magnet body 3 is slid along the facing surface 241 toward the side opposite to the opening direction. Accordingly, the magnet body 3 can be inserted and disposed in the housing recess 40 while being in a state parallel to the end surface 211 and the facing surface 241. Thereby, the magnet body 3 can be smoothly inserted and arranged in the housing recess 40. And the crack of the magnet body 3 can be prevented.

  As described above, according to the ignition coil 1 of the present example, an internal combustion engine ignition coil that can prevent internal leakage of voltage due to mixing or diffusion of metal foreign matters and can smoothly assemble a magnet body, and a method for manufacturing the same are provided. can do.

(Example 2)
In this example, as shown in FIG. 10, the outer peripheral core 24 is shaped so that the height h1 in the opening direction is constant.
Specifically, as shown in FIG. 11, the outer peripheral core 24 of this example is shaped such that the height h <b> 1 of the outer peripheral core 24 is higher than the height h <b> 2 of the end portion 212 of the center core 21.
Others are the same as in the first embodiment.

The opening direction of the housing recess 40 in this example is a direction orthogonal to the direction in which the connecting portion 243 is arranged, the opposing portion 242 of the outer core 24 is provided with the protruding portion 5, and the outer core 24 is in the opening direction. It has a shape in which the height h1 is constant. Accordingly, the protruding portion 5 can be easily formed by assembling the outer peripheral core 24 and the central core 21 in an offset state, for example, without providing a portion protruding from the other portion in the facing portion 242 of the outer peripheral core 24. be able to.
In addition, the same effects as those of the first embodiment are obtained.

Example 3
In this example, as shown in FIG. 12, the protruding portion 5 is formed at the end portion 212 of the central core 21. That is, of the end portion 212 of the central core 21 and the facing portion 242 of the outer peripheral core 24 that face each other with the housing recess 40 interposed therebetween, the end portion 212 of the central core 21 is positioned more than the facing recess 242 of the outer core 24. It projects in the opening direction. The protruding portion is the protruding portion 5, and the surface on the housing recess 40 side is the slide surface 50.
Others are the same as in the first embodiment.

In the case of this example, when inserting the magnet body 3 into the housing recess 40, the end surface 211 of the end 212 of the central core 21 is slid while sliding.
In addition, the same effects as those of the first embodiment are obtained.

  In addition, although the outer periphery core 24 shown in the said Example 1- Example 3 is made into the frame shape which has the two connection parts 243 which connect a pair of opposing part 242 in each both ends, an outer periphery core 24 can also be made into the shape which has the one connection part 243 which connects a pair of opposing part 242 in each one end.

DESCRIPTION OF SYMBOLS 1 Ignition coil 11 Case 21 Central core 211 End surface 212 End part 22 Primary coil 23 Secondary coil 24 Outer core 241 Opposing surface 242 Opposing part 3 Magnet body 4 Guide member 40 Housing recessed part 41 Opening part 5 Protruding part 50 Sliding surface

Claims (6)

A central core made of soft magnetic material;
A primary coil and a secondary coil in which the central core is arranged penetrating on the inner peripheral side;
The pair of opposed portions formed with opposed surfaces facing the pair of end surfaces at both ends of the central core in the penetrating direction are connected to the pair of opposed portions, and on the outer peripheral side of the primary coil and the secondary coil. An outer peripheral core made of a soft magnetic material integrally provided with a connecting portion to be arranged;
A magnet body disposed between at least one of the end surfaces of the central core and the facing surface of the outer peripheral core;
A guide member made of an insulator that guides the magnet body so as to surround the magnet body from three directions orthogonal to the penetrating direction;
Between the guide member, the end surface, and the facing surface, an accommodation recess having an opening that is open in a direction orthogonal to the penetrating direction and in which the connecting portion is not disposed is formed.
One of the end portion of the central core and the facing portion of the outer peripheral core facing each other across the housing recess protrudes in the opening direction of the housing recess with respect to the other and the end surface or the facing have a protruding portion with a slide surface serving as a surface flush,
An ignition coil for an internal combustion engine, characterized in that the end portion or the facing portion provided with the protruding portion is engaged with the guide member .   2. The ignition coil for an internal combustion engine according to claim 1, wherein an opening direction of the housing recess is a direction orthogonal to a direction in which the connecting portion is disposed, and the facing portion of the outer peripheral core includes the protruding portion. An ignition coil for an internal combustion engine, wherein the outer core has a shape with a constant height in the opening direction.   The ignition coil for an internal combustion engine according to claim 1 or 2, wherein the guide member is integrally formed with a connector portion for electrically connecting the primary coil to the outside. Ignition coil. A central core made of soft magnetic material;
A primary coil and a secondary coil in which the central core is arranged penetrating on the inner peripheral side;
The pair of opposed portions formed with opposed surfaces facing the pair of end surfaces at both ends of the central core in the penetrating direction are connected to the pair of opposed portions, and on the outer peripheral side of the primary coil and the secondary coil. An outer peripheral core made of a soft magnetic material integrally provided with a connecting portion to be disposed; and a clearance formed between at least one end face of the central core and the opposing surface of the outer core. And a guide member made of an insulator that guides so as to surround from three directions orthogonal to each other, and between the guide member, the end surface, and the facing surface, a direction orthogonal to the penetration direction, Forming a sub-assembly in which an accommodation recess having an opening that opens in a direction in which the connecting portion is not disposed,
One of the end portion of the central core and the facing portion of the outer peripheral core facing each other across the housing recess protrudes in the opening direction of the housing recess with respect to the other, and the end surface or the facing It has a protrusion with a slide surface that is flush with the surface,
The end portion or the facing portion provided with the protruding portion is engaged with the guide member,
In placing the magnet body through the opening in the housing recess in the sub-assembly,
A part of one surface of the magnet body is brought into surface contact with the slide surface of the protrusion,
Next, the magnet body is slid toward the side opposite to the opening direction along the end face or the opposed face that is flush with the slide surface, and the magnet body is inserted and disposed in the housing recess. A method of manufacturing an ignition coil for an internal combustion engine, which is characterized in that   5. The method of manufacturing an ignition coil for an internal combustion engine according to claim 4, wherein an opening direction of the housing recess is a direction orthogonal to a direction in which the connecting portion is disposed, and the facing portion of the outer peripheral core projects. A method of manufacturing an ignition coil for an internal combustion engine, wherein the outer peripheral core has a shape with a constant height in the opening direction.   6. The ignition coil for an internal combustion engine according to claim 4, wherein the guide member is integrally formed with a connector portion for electrically connecting the primary coil to the outside. Method for producing an ignition coil.

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