JP2013012643A - Reactor and mold construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor capable of achieving a weld section with high strength and high crack resistance.SOLUTION: The reactor includes a resin mold core 15 with a core 10 and resin mold 14 molded with resin from the outside and a coil 12 wound around the circumference of the resin mold core 15. The resin mold 14 has a weld section 19, and the core 10 has a gas exhaust structure, such as a slit 18, at a portion corresponding to the weld section 19.

Description

  The present invention relates to a reactor, and in particular, relates to a resin mold core formed by molding a magnetic material core with resin from the outside, a reactor around which a coil is wound, and a mold structure for forming the resin mold core. .

  Conventionally, for example, in a vehicle equipped with a rotating electrical machine such as an electric vehicle or a hybrid vehicle, the rotating electrical machine drive device is configured by providing an inverter or a booster circuit between the rotating electrical machine and a power supply device such as a secondary battery. It is known to do. The booster circuit includes a switching element and a reactor connected to the switching element, and the reactor includes a core made of a magnetic material such as an iron core and a dust core, and a coil wound around the core. The booster circuit can control the power storage in the reactor by controlling the ON time and the OFF time of the switching element, and can boost the voltage supplied from the power source to an arbitrary voltage and supply it to the inverter. . Further, the reactor may be used as a transformer element or a noise filter in an electric circuit.

  As such a reactor, there is a reactor in which a core made of a magnetic material is molded with a resin from the outside in order to insulate the core and the coil to form a resin mold core covered with a resin mold, and the coil is wound ( For example, see Patent Document 1). For example, a substantially U-shaped core is molded with resin from the outside to form a substantially U-shaped resin mold core covered with a resin mold, and both ends of the pair of substantially U-shaped resin mold cores are non-magnetic. By bonding with an adhesive or the like via an intermediate gap plate made of a material, as shown in FIG. 16, a track-like (annular) resin mold core 60 in which the core 50 is covered with a resin mold 54 is formed, The reactor 3 is configured by winding a pair of coils 52 around a pair of substantially I-shaped portions of the track-shaped resin mold core 60 facing each other. The substantially U-shaped resin mold core is obtained, for example, by loading a substantially U-shaped core made of a magnetic material into a mold, filling the cavity of the mold with resin, and performing insert molding.

  In such a reactor 3, an opening 56 may be formed in the resin mold 54 in order to dissipate heat generated during the operation of the reactor or to fix the core during insert molding. When the opening 56 is formed, a weld 58 (dotted line portion in FIG. 16) is generated during molding depending on the shape of the opening 56. As shown in a schematic top view showing the flow of the resin in the mold when the resin mold is formed in FIG. 17, the weld portion 58 allows the resin to be injected from the two resin inlets 62 of the mold 68 during the molding. It is a molding defect such as a linear mark that occurs because the resin is solidified before it completely melts at the place where the flow fronts of the two resins join, and the strength (weld strength) tends to decrease It is in. Further, the resin used for the resin mold may be filled with glass fiber or the like as a reinforcing material for reinforcing the strength, but the weld portion 58 is difficult to obtain the effect of the reinforcing material, and the weld strength tends to be low. . When a high thermal conductive resin such as polyphenylene sulfide (PPS) resin is used as the resin used for the resin mold, the weld strength tends to be lower when the weld strength is originally low and when a large amount of the thermal conductive filler is filled. Resins, particularly polyphenylene sulfide resins, generate gas during molding, and if the generated gas hinders the merging of the resin at the weld 58, the weld strength tends to be further reduced.

  For this reason, it is desirable to sufficiently exhaust gas at the weld 58 during the molding of the resin mold 54. FIG. 18A shows a schematic top view of a mold when a resin mold is formed without inserting a core. FIG. 19A shows a schematic top view of a mold when a core is inserted to form a resin mold. If it is not insert molding in which the core 50 is loaded into the mold 68 at the time of molding the resin mold, the weld of the mold 68 is shown in FIG. 18B as a cross-sectional view taken along the line HH in FIG. The gas exhaust part 64 can be set on both surfaces of the cavity 66 of the part 58, and gas exhaust can be sufficiently performed.

  On the other hand, in the case of insert molding in which the core 50 is loaded into the mold 68 during the molding of the resin mold 54, the weld of the mold 68 is shown in FIG. The gas exhaust part 64 can be set only on one side of the cavity 66 of the part 58, and the gas exhaust can not be performed sufficiently. For this reason, in the case of insert molding, the weld strength becomes particularly low, and molding defects such as cracks may occur due to cold heat or the like starting from the weld portion 58.

JP 2010-238798 A

  An object of the present invention is to provide a reactor having a high weld portion and excellent crack resistance.

  Moreover, the objective of this invention is providing the metal mold | die structure for forming the resin mold core which comprises the reactor whose strength of a weld part is high and is excellent in crack resistance.

  The present invention comprises a resin mold core having a core and a resin mold obtained by molding the core with resin from the outside, and a coil wound around the resin mold core, the resin mold having a weld portion. The core is a reactor having a gas exhaust structure in a portion corresponding to the weld portion.

  In the reactor, the gas exhaust structure is preferably a slit formed in at least a part of the surface of the core.

  Further, in the reactor, the core is preferably configured by bonding a split core, and the gas exhaust structure is preferably a lattice-shaped slit formed on at least one bonding surface of the split core. .

  The present invention is also a mold structure for insert molding a resin mold in which a core is molded with resin from the outside, the resin mold having a weld portion, and the core is a portion corresponding to the weld portion. A gas exhaust structure, and the mold structure is a mold structure having a gas exhaust part formed to communicate with the gas exhaust structure.

  In the present invention, by providing the gas exhaust structure in the core portion corresponding to the weld portion of the resin mold, it is possible to provide a reactor having high weld portion strength and excellent crack resistance.

  Further, in the present invention, in a mold structure for insert molding a resin mold in which a core provided with a gas exhaust structure in a portion corresponding to a weld portion of the resin mold is molded with resin from the outside, the gas exhaust structure is communicated. By providing the gas exhaust part formed in the mold, a mold structure for forming a resin mold core constituting a reactor having high weld part strength and excellent crack resistance can be provided.

It is a schematic top view which shows an example of the reactor which concerns on embodiment of this invention. It is a schematic top view which shows an example of the method of forming the resin mold core in the reactor which concerns on embodiment of this invention. (A) It is a schematic top view which shows an example of the split core in the reactor which concerns on embodiment of this invention. (B) It is AA sectional drawing in Fig.3 (a), and is a schematic sectional drawing which shows an example of the slit of the core in the reactor which concerns on embodiment of this invention. It is the schematic top view which looked at the slit shown in FIG.3 (b) from the upper part of the core. It is AA sectional drawing in Fig.3 (a), and is a schematic sectional drawing which shows the other example of the slit of the core in the reactor which concerns on embodiment of this invention. It is a figure which shows the metal mold | die structure in the AA cross section in Fig.3 (a). (A) In embodiment of this invention, it is a schematic sectional drawing which shows the gas exhaustion part in a metal mold | die. (B) It is a B arrow line view in Fig.7 (a). It is a schematic top view which shows the other example of the reactor which concerns on embodiment of this invention. (A) It is a schematic top view which shows the other example of the core in the reactor which concerns on embodiment of this invention. (B) It is CC sectional drawing in Fig.9 (a), and is a schematic sectional drawing which shows an example of the lattice-like slit of the core in the reactor which concerns on embodiment of this invention. It is the schematic top view which looked at the grid | lattice-like slit shown in FIG.9 (b) from the upper part of the core. It is a figure which shows an example of a grid | lattice-like slit, FIG.11 (b) is a D arrow line view in Fig.11 (a), FIG.11 (c) is an E arrow line view in Fig.11 (a). It is a figure which shows the other example of a grid | lattice-like slit, FIG.12 (b) is a F arrow line view in Fig.12 (a), FIG.12 (c) is a G arrow line view in Fig.12 (a). . It is a perspective view which shows an example of the method of forming a grid | lattice-like slit. It is a schematic top view which shows the other example of the method of forming the resin mold core in the reactor which concerns on embodiment of this invention. It is a figure which shows the weld strength of the resin mold of the Example and comparative example of this invention. It is a schematic top view which shows an example of the conventional reactor. It is a schematic top view which shows the flow of resin in the metal mold | die at the time of shape | molding a resin mold. (A) It is a schematic top view which shows the metal mold | die at the time of shape | molding a resin mold, without inserting a core. (B) It is HH sectional drawing in Fig.18 (a), and is a figure which shows the gas exhaustion part in a metal mold | die. (A) It is a schematic top view which shows the metal mold | die at the time of inserting a core and shape | molding a resin mold. (B) It is II sectional drawing in Fig.19 (a), and is a figure which shows the gas exhaust part in a metal mold | die.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

  The schematic top view of an example of the reactor which concerns on embodiment of this invention is shown in FIG. 1, and the structure is demonstrated. The reactor 1 includes a resin mold core 15 in which a track-shaped core 10 made of a magnetic material is housed, and a pair of opposed surfaces wound around a pair of substantially I-shaped portions of the track-shaped resin mold core 15 facing each other. A coil 12. For example, as shown in FIG. 2, the reactor 1 includes substantially U-shaped resin mold cores 15a, 10a and 10b, each of which is molded with resin from the outside and covered with resin molds 14a and 14b. 15b is formed, and both ends of the pair of substantially U-shaped resin mold cores 15a and 15b are joined with an adhesive or the like via an intermediate gap plate made of a non-magnetic material. A covered track-shaped (annular) resin mold core 15 is configured, and a pair of coils 12 are wound around a pair of substantially I-shaped portions of the track-shaped resin mold core 15 facing each other. An opening 16 is formed in the resin mold 14 to dissipate heat generated during the operation of the reactor 1 and to fix the core 10 during insert molding.

  The substantially U-shaped resin mold cores 15a and 15b are obtained, for example, by loading the substantially U-shaped split cores 10a and 10b into molds, filling the mold cavities with resin, and performing insert molding. . The vicinity of the center of the portion where the opening 16 of the resin mold 14 is formed becomes a weld portion 19 (dotted line portion in FIG. 1) during insert molding.

  Here, in the split cores 10a and 10b, slits 18 are provided as gas exhaust structures in portions corresponding to weld portions generated during insert molding of the resin mold. As a result, a reactor having high weld strength and excellent crack resistance due to a cold environment or the like can be obtained.

  FIG. 3 is a schematic top view of the split core 10a in the reactor 1, and FIG. 3B is a cross-sectional view taken along line AA in FIG. FIG. 4 shows a schematic top view of the slit shown in FIG. 3B as viewed from the top of the core. The slit 18 has a predetermined clearance X and a depth d, and is formed in the surface portion of the split core 10a. Moreover, as shown in FIG.3 (b), the slit 18 is provided in the perimeter of the AA cross section of the core 10a.

  In FIG. 3B, the slits 18 are provided on the entire circumference of the AA cross section of the core 10a. However, as shown in FIG. The slits 18 may be provided only in the vicinity of the portion where the erosion is likely to occur, that is, in the vicinity of the portion corresponding to the weld portion. Thereby, the formation process of a slit can be simplified.

  The slit 18 may be formed by any method that can form a slit having a predetermined clearance and depth, and is not particularly limited. For example, the split core 10a made of a magnetic material using a laser or the like. The method of processing the surface of this is mentioned. By using a laser, a minute clearance X and a depth d can be easily formed. Here, it is desirable to set the clearance X and the depth d so that the performance of the reactor does not deteriorate. Further, it is desirable that the clearance X and the depth d are set to such an extent that the resin used for forming the resin mold 14 hardly passes and gas passes. That is, it is desirable to set the clearance X and the depth d to such an extent that a gas exhaust failure does not occur due to the resin flowing into the slit 18. However, if the gas is appropriately exhausted, there is no problem in the resin itself flowing into the slit 18. The clearance X is, for example, in the range of 0.01 mm to 0.05 mm. The depth d is, for example, in the range of 1 mm to 5 mm.

  As shown in FIG. 6 in which the mold structure is taken along the line AA in FIG. 3A, the cavity 24 for pouring the resin into the position corresponding to the weld portion of the molds 26 and 28 used for the insert molding of the resin mold 14. And a gas exhaust part 23 communicating with the slit 18 of the core 10 are provided. Thereby, in the insert molding of the resin mold 14, the gas generated from the resin is discharged from both surfaces of the cavity 24, that is, on one surface (inner surface), from the slit 18 through the gas exhaust part 23, and on the other side. On the surface (outer surface), gas is discharged through the gas exhaust part 22. As a result, a reactor having high weld strength and excellent crack resistance can be obtained.

  FIG. 7A shows a schematic cross-sectional view showing a gas exhaust part in the mold, and FIG. 7B shows a view taken in the direction of arrow B in FIG. 7A. As described above, the mold 28 has a slit-shaped gas exhaust part 22 on the mold surface at a position corresponding to the weld part, and a pin that communicates with the slit 18 of the core 10 on the surface in contact with the slit 18 of the core 10. It is preferable to provide a gas exhaust part 23 having a shape or the like. Thereby, the gas generated at the time of molding can be exhausted from both surfaces of the cavity 24 in the weld portion.

  Thus, since the gas generated at the time of molding is exhausted from both surfaces of the cavity 24 in the weld portion, the weld strength is improved and the crack resistance is improved. Further, by setting the clearance X and the depth d of the slit 18 to predetermined values, it is possible to allow gas to pass through almost no resin during molding. Further, by setting the clearance X and the depth d of the slit 18 to predetermined values, the performance of the reactor does not deteriorate.

  The core 10 is a magnetic core such as a dust core of a magnetic material such as a metal material. The core 10 is not limited to the powder magnetic core, but is made of metal such as pure iron, Fe—Si, Fe—Ni, Ni—Co, and other metal magnetic materials, and metal oxide magnetic materials such as ferrite. It may be made of a magnetic core obtained by bonding powder particles of the material by pressure molding, or sintering and heat-treating the powder particles.

  Examples of the resin constituting the resin mold 14 include highly heat conductive resins such as polyphenylene sulfide (PPS) resin and polybutylene terephthalate (PBT) resin. The resin may be filled with glass fiber or the like as a reinforcing material for reinforcing the strength. Moreover, when using highly heat conductive resin, such as polyphenylene sulfide (PPS) resin, you may fill with heat conductive fillers, such as an alumina, magnesium oxide, and aluminum nitride.

  The bobbin may be integrally formed of the same resin material as the resin of the resin mold 14. The bobbin may not be the same material as the resin of the resin mold 14. For example, the bobbin may be formed by two-color molding or the like using the bobbin material and the resin material of the resin mold 14 at once, or the bobbin may be formed in a separate process.

  The adhesive for adhering the resin mold cores 15a and 15b is not particularly limited as long as it can adhere the resin mold core, and examples thereof include an epoxy-based high heat-resistant adhesive.

  FIG. 8 shows a schematic top view of another example of the reactor according to the embodiment of the present invention. The reactor 3 includes a resin mold core 15 in which a track-shaped core 10 made of a magnetic material is housed, and a pair of opposed surfaces wound around a pair of substantially I-shaped portions of the track-shaped resin mold core 15 facing each other. A coil 12. For example, as shown in FIG. 14, the reactor 3 includes a substantially L-shaped split core 10 c and 10 d in which lattice-like slits 20 are formed in advance on at least one of the bonding surfaces 30. A substantially U-shaped split core 10e bonded is formed, and the substantially U-shaped split core 10e is molded with resin from the outside to form a substantially U-shaped resin mold core 15c covered with a resin mold 14c. A track shape in which the core 10 is covered with the resin mold 14 by joining both ends of the pair of substantially U-shaped resin mold cores 15c and 15d with an adhesive or the like via an intermediate gap plate made of a nonmagnetic material. A (annular) resin mold core 15 is configured, and a pair of coils 12 are wound around a pair of substantially I-shaped portions of the track-shaped resin mold core 15 facing each other. An opening 16 is formed in the resin mold 14 to dissipate heat generated during the operation of the reactor 1 and to fix the core 10 during insert molding.

  The substantially U-shaped resin mold cores 15c and 15d are obtained, for example, by loading the substantially U-shaped split cores 10e and 10f into molds, filling the mold cavities with resin, and performing insert molding. . The vicinity of the center of the portion where the opening 16 of the resin mold 14 is formed is a weld portion 19 (dotted line portion in FIG. 8) during insert molding.

  Here, a lattice-like slit 20 is provided as a gas exhaust structure in a portion corresponding to a weld portion generated at the time of insert molding, which is at least one of the bonding surfaces of the split cores 10c and 10d. As a result, a reactor having high weld strength and excellent crack resistance due to a cold environment or the like can be obtained.

  FIG. 9 shows a schematic top view of the split core 10e in the reactor 1, and FIG. 9B shows a CC cross-sectional view in FIG. 9A. FIG. 10 shows a schematic top view of the slit shown in FIG. 9B as viewed from the top of the core. The lattice slit 20 has a predetermined width w and a clearance x, and is formed on the adhesive surface 30 of the split core 10 c so as to be substantially orthogonal to the surface of the core 10. Further, as shown in FIG. 9B, the bonding portion 32 is provided in a part of the bonding surface 30 of the core 10 c, for example, near the center of the bonding surface 30 of the core 10 c, and around the bonding portion 32. The slit 20 is provided, and thereby the split core 10c and the split core 10d are bonded in a state in which the lattice slit 20 is provided around the bonding portion 32. Since each lattice-shaped slit 20 has a smaller width direction of each slit than the width direction of the slit 18 in FIG. 3, the flow of the resin into the slit is reduced, and the gas exhaustability is improved.

  The method for forming the lattice-shaped slit 20 is not particularly limited as long as it is a method capable of forming a lattice-shaped slit having a predetermined width and clearance. The method etc. which process the surface of the adhesion surface 30 of the division | segmentation core 10a made from material are mentioned. Here, it is desirable to set the width w and the clearance x to such an extent that the reactor performance does not deteriorate. Further, it is desirable that the width w and the clearance x are set to such an extent that the resin used for molding the resin mold 14 hardly passes and gas passes. That is, it is desirable to set the width w and the clearance x to such an extent that a gas exhaust failure does not occur due to the resin flowing into the lattice-like slit 20. However, if the gas is appropriately exhausted, there is no problem with the resin itself flowing into the lattice slit 20. The width w is, for example, in the range of 0.01 mm to 0.1 mm, and the clearance x is, for example, in the range of 0.01 mm to 0.1 mm. Compared to the slit 18, the slit width can be set arbitrarily, and the flow of resin is reduced, which is preferable.

  Similar to the configuration shown in FIG. 6, the gas exhaust part 22 communicating with the cavity 24 into which the resin is poured, and the lattice of the core 10, at positions corresponding to the weld parts of the molds 26 and 28 used for insert molding of the resin mold 14. A gas exhaust 23 communicating with the slit 20 is provided. Thereby, in insert molding of the resin mold 14, the gas generated from the resin is discharged from both sides of the cavity 24, that is, on one side (inner side), from the lattice slit 20 through the gas exhaust part 23, On the other surface (outer surface), the gas is discharged through the gas exhaust part 22. As a result, a reactor having high weld strength and excellent crack resistance can be obtained.

  In FIG. 9, the lattice slit 20 is formed on the bonding surface 30 of the split core 10 c so as to be substantially orthogonal to the surface of the core 10, but is not limited to this form. By being formed so as to be substantially orthogonal to the surface of the core 10, when processing the grid-like slits 20, for example, as shown in FIG. 13, a plurality of divided cores 10 c are arranged in a row and cut in the direction of the arrow. Thus, the lattice slits 20 of the plurality of divided cores 10c can be simultaneously processed, and the workability is improved.

  FIG. 11A shows a schematic top view of the split cores 10c and 10d in the reactor 3. FIG. FIG. 11B is a view taken in the direction of arrow D in FIG. 11A, and FIG. 11C is a view taken in the direction of arrow E in FIG. In this way, lattice-shaped slits may be formed on one of the split cores (the split core 10c in the example of FIG. 11).

  FIG. 12A shows a schematic top view of the split cores 10c and 10d in the reactor 3. FIG. FIG. 12B is a view taken in the direction of arrow F in FIG. 12A, and FIG. 12C is a view taken in the direction of arrow G in FIG. In this way, linear slits that are substantially orthogonal to both of the split cores (both the split core 10c and the split core 10d in the example of FIG. 12) are formed by machining and bonded to form a grid-like slit. May be.

  The adhesive for adhering the split core is not particularly limited as long as it can adhere the split core, and examples thereof include an epoxy-based high heat-resistant adhesive.

  The adhesive application range is preferably set at a predetermined interval from the surface of the core sufficient to exhaust the gas. The distance from the surface of the core is, for example, in the range of 3 mm to 10 mm.

  As in the configuration shown in FIG. 7, the mold 28 includes a slit-shaped gas exhaust part 22 on the mold surface at a position corresponding to the weld part, and a surface in contact with the grid-like slit 20 of the core 10. It is preferable to provide a pin-like gas exhaust part 23 communicating with the ten lattice slits 20. Thereby, the gas generated at the time of molding can be exhausted from both surfaces of the cavity 24 in the weld portion.

  Thus, since the gas generated at the time of molding is exhausted from both surfaces of the cavity 24 in the weld portion, the weld strength is improved and the crack resistance is improved. Further, by setting the width w and the clearance x of the lattice slit 20 to predetermined values, it is possible to pass the gas through almost no resin during molding. Further, by setting the width w and the clearance x of the lattice slit 20 to predetermined values, the performance of the reactor does not deteriorate.

  As the gas exhaust structure in the reactor according to the present embodiment, the slit 18 as shown in FIGS. 3, 4 and 6 and the grid-like slit 20 as shown in FIGS. 9 and 10 are given as examples. Any structure can be used as long as it can be exhausted, and the structure is not particularly limited. For example, it may not be a geometric shape and may be a random groove shape. Further, the adhesive surface of the split core may be roughened so that the gas can be exhausted.

  For example, the reactor according to the present embodiment can be used as a transformer element by connecting both ends of a pair of coils 12 to another electric circuit (not shown) between the pair of coils 12. Moreover, it can also be used as a single reactor by connecting the ends of the pair of coils 12.

  The reactor according to the present embodiment is mounted on, for example, a vehicle such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle.

  The mold structure according to the present embodiment can be used for forming a resin mold core constituting the reactor.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely in detail, the present invention is not limited to the following examples.

Example 1
The slits as shown in FIGS. 3 and 4 were formed on the entire circumference of the AA cross section of the core at a position corresponding to the weld by laser processing. The clearance X was about 0.01 mm, and the depth d was about 3 mm. As shown in FIG. 7, the mold has a slit-like gas exhaust part on the mold surface at the weld position, and a pin-like gas exhaust part communicating with the core slit on the surface in contact with the core slit. The resin mold core as shown in FIG. 1 was formed by providing and insert molding. The weld strength of the resin mold is shown in FIG.

  The weld strength of the resin mold was measured by cutting a weld and performing a tensile test.

(Example 2)
A grid-like slit as shown in FIGS. 9 and 10 was formed over the entire area of one adhesive surface of the split core at a position corresponding to the weld by cutting using a cutting tooth tool. The width w and clearance x were each about 0.05 mm. As shown in FIG. 9B, the epoxy adhesive was applied at a distance of 5 mm from the surface of the core. In the same manner as in Example 1, the mold has a slit-shaped gas exhaust part on the mold surface at the weld position, and a pin-shaped gas exhaust part communicating with the core slit on the surface in contact with the core slit. And insert molding to form a resin mold core as shown in FIG. The weld strength of the resin mold is shown in FIG.

(Comparative Example 1)
Insert molding was performed in the same manner as in Example 1 except that no gas exhaust part was provided in the mold. The weld strength of the resin mold is shown in FIG.

(Comparative Example 2)
Insert molding was performed in the same manner as in Example 1 except that the gas exhaust part was provided only on the mold surface and the gas exhaust part communicating with the slit was not provided. The weld strength of the resin mold is shown in FIG.

  In FIG. 15, the graph which shows the weld strength of the resin mold of the Example of this invention and a comparative example is shown. Comparative Example 1 is a case where no gas exhaust part is provided in the mold, and Comparative Example 2 is a case where the gas exhaust part is provided only on the mold surface. The weld strength was expressed as a relative value where the weld strength of a resin material molded without inserting a core as shown in FIG. As can be seen from FIG. 15, the weld strengths of Examples 1 and 2 were improved as compared with Comparative Examples 1 and 2.

  1,3 reactors, 10, 50 cores, 10a, 10b, 10c, 10d, 10e, 10f split cores, 12, 52 coils, 14, 14a, 14b, 14c, 14d, 54 resin molds, 15, 15a, 15b, 15c , 15d, 15e, 15f, 60 Resin mold core, 16, 56 opening, 18 slit, 19, 58 weld, 20 grid slit, 22, 23 gas exhaust, 24 cavity, 26, 28, 68 mold, 30 bonding surface, 32 bonding portion, 62 resin injection port, 64 gas exhaust portion, 66 cavity.

Claims (4)

A resin mold core having a core and a resin mold obtained by molding the core with resin from the outside;
A coil wound around the resin mold core;
With
The resin mold has a weld portion,
The core has a gas exhaust structure in a portion corresponding to the weld portion. The reactor according to claim 1,
The reactor, wherein the gas exhaust structure is a slit formed in at least a part of the surface of the core. The reactor according to claim 1,
The core is configured by bonding a split core;
The reactor, wherein the gas exhaust structure is a grid-like slit formed on at least one bonding surface of the split core. A mold structure for insert molding a resin mold in which a core is molded with resin from the outside,
The resin mold has a weld portion,
The core has a gas exhaust structure in a portion corresponding to the weld portion,
The mold structure has a gas exhaust part formed to communicate with the gas exhaust structure.

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