Core unit

Abstract

To provide a core unit that has excellent characteristics and can save a mounting space.SOLUTION: A core unit comprises a first magnetic core, a first core case, a second magnetic core, and a second core case. The first core case includes a first outer wall part and a first flange part. The second core case includes a second outer wall part and a second flange part. The first flange part includes a first projection region which projects axially toward the second core case. The second flange part includes a second projection region which projects axially toward the first core case. The core unit is constituted by combining the first core case and second core case such that the second projection region overlaps with the first flange part and the first projection region overlaps with the second flange part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a core unit. [Background technology]

[0002] A technique related to a unit case that houses a ferrite core has been disclosed (for example, see Patent Document 1). In the unit case disclosed in Patent Document 1, a plurality of ferrite cores are housed and aligned coaxially. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-192825 A Summary of the Invention [Problem to be solved by the invention]

[0004] A magnetic core such as a ferrite core may be fixed around a wiring and used as a noise filter. A core unit that holds such a magnetic core is required to have good characteristics as a noise filter and to reduce the installation space when installed.

[0005] Therefore, one of the objects is to provide a core unit that has good characteristics and can reduce the mounting space. [Means for solving the problem]

[0006] The core unit according to the present disclosure is a core unit that holds a magnetic core, and includes a first annular magnetic core, a first core case that houses the first magnetic core, a second annular magnetic core that is spaced apart from the first magnetic core in the axial direction, and a second core case that is arranged in line with the first core case in the axial direction and houses the second magnetic core. The first core case includes a first outer wall portion that is arranged on the outer periphery side of the first magnetic core, and a first flange portion that is plate-shaped and extends outward from the outer periphery surface of the first outer wall portion. The second core case includes a second outer wall portion that is arranged on the outer periphery side of the second magnetic core, and a second flange portion that is plate-shaped and extends outward from the outer periphery surface of the second outer wall portion. The first flange portion includes a first protruding region that protrudes toward the second core case in the axial direction. The second flange includes a second protruding region that protrudes toward the first core case in the axial direction. The core unit is configured by combining the first core case and the second core case such that the second protruding region overlaps with the first flange and the first protruding region overlaps with the second flange. Effect of the Invention

[0007] Such a core unit has good characteristics and can reduce the installation space. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view showing an external appearance of a core unit according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is an exploded perspective view of the core unit shown in FIG. [Diagram 3] FIG. 3 is a schematic bottom view of the core unit shown in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along the line IV-IV in FIG. [Diagram 5] FIG. 5 is a schematic cross-sectional view taken along the line VV in FIG. [Figure 6] 6A and 6B are a schematic front view and a schematic bottom view of a first core case included in the core unit shown in FIG. [Figure 7] FIG. 7 is a schematic perspective view showing an external appearance of the core unit in the second embodiment. [Figure 8] FIG. 8 is a schematic cross-sectional view taken along the line VIII-VIII in FIG. [Figure 9] FIG. 9 is an exploded perspective view of the core unit shown in FIG. [Figure 10] FIG. 10 is an exploded perspective view of the core unit according to the third embodiment. [Figure 11] FIG. 11 is a schematic perspective view showing an external appearance of the core unit according to the fourth embodiment. [Figure 12] FIG. 12 is an exploded perspective view of the core unit shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described. (1) A core unit according to the present disclosure is a core unit for holding a magnetic core, and includes a first annular magnetic core, a first core case for accommodating the first magnetic core, a second annular magnetic core arranged at an axial distance from the first magnetic core, and a second core case arranged in line with the first core case for accommodating the second magnetic core. The first core case includes a first outer wall portion arranged on the outer periphery side of the first magnetic core, and a plate-shaped first flange portion provided so as to extend outward from the outer periphery surface of the first outer wall portion. The second core case includes a second outer wall portion arranged on the outer periphery side of the second magnetic core, and a plate-shaped second flange portion provided so as to extend outward from the outer periphery surface of the second outer wall portion. The first flange portion includes a first protruding region that protrudes toward the second core case in the axial direction. The second flange includes a second protruding region that protrudes toward the first core case in the axial direction. The core unit is configured by combining the first core case and the second core case such that the second protruding region overlaps with the first flange and the first protruding region overlaps with the second flange.

[0010] According to the core unit of the present disclosure, since the core unit is configured to include a plurality of magnetic cores, such as a first magnetic core and a second magnetic core, it is possible to maintain a high impedance at high frequencies, for example, and improve the characteristics, compared to a case where one large magnetic core is included. In this case, the size of each magnetic core can be reduced, and productivity can be improved. In addition, the first core case that houses the first magnetic core includes a first flange that protrudes outward from the outer circumferential surface of the first outer wall portion, and the second core case that houses the second magnetic core includes a second flange that protrudes outward from the outer circumferential surface of the second outer wall portion. The core unit is configured by combining the first core case and the second core case such that the second protruding region overlaps with the first flange, and the first protruding region overlaps with the second flange. Therefore, the first flange and the second flange can be overlapped and fixed while shortening the axial length. This allows the space required in the parallel direction to be reduced when mounting the core unit, compared to when two conventional core fixing structures are arranged in parallel. In this case, sufficient space can be secured when fixing the first core case and the second core case that are stacked and combined at the first flange and the second flange, respectively. Therefore, the first core case and the second core case can be reliably maintained in a combined state while being made into a more compact shape. As described above, the core unit has good characteristics and can reduce the mounting space.

[0011] (2) In the above (1), the first flange may have a first through hole formed therethrough in the thickness direction. The second flange may have a second through hole formed therethrough in the thickness direction. The core unit may be configured by combining the first and second flanges so that the position of the first through hole and the position of the second through hole coincide when viewed in the thickness direction of the first flange. By doing so, the first and second flanges can be stacked and fixed by, for example, passing the body of a bolt through the first and second through holes using the first and second through holes. In this case, since the first flange includes a first protruding region protruding toward the second core case side and the second flange includes a second protruding region protruding toward the first core case side, it is possible to sufficiently secure the space for providing the first and second through holes that can be used for fastening the bolt in the first and second flanges, respectively. Therefore, the combined first and second core cases can be fixed more reliably.

[0012] (3) In the above (1) or (2), a plurality of first flanges and a plurality of second flanges may be included. In this way, the core unit can be fixed using a plurality of first flanges and a plurality of second flanges. Therefore, the fixed state of the core unit can be more reliably maintained.

[0013] (4) In the above (3), the first flanges may be provided in pairs. The pair of first flanges may be formed at positions rotated 180 degrees in the circumferential direction. The second flanges may be provided in pairs. The pair of second flanges may be formed at positions rotated 180 degrees in the circumferential direction. In this way, the core unit can be stably fixed by the bolt at positions 180 degrees opposed to each other. Therefore, the core unit can be fixed more stably.

[0014] (5) In any of the above (2) to (4), the first flange may include a first fitting portion that is hollow cylindrical and extends along the inner edge of the first through hole in the thickness direction of the first flange, and fits into the second through hole when the first core case and the second core case are combined. By doing so, the first fitting portion fits into the second through hole, so that the risk of the second flange being displaced relative to the first flange can be greatly reduced. This makes it possible to suppress the positional displacement of the second flange relative to the first flange, and to easily avoid a situation in which the first flange and the second flange rub against each other due to vibration or the like. Therefore, the fixed state of the core unit can be stably maintained for a longer period of time.

[0015] (6) In any of the above (1) to (5), a partition plate may be further provided between the first magnetic core and the second magnetic core. In this way, the partition plate can reduce the risk of the first magnetic core and the second magnetic core coming into contact with each other. Therefore, the risk of the core unit being damaged can be significantly reduced.

[0016] (7) In any of the above (1) to (6), the first core case may include a first reinforcing rib. The first reinforcing rib may be provided to connect an axial end of the first flange and an outer peripheral surface of the first outer wall. In this way, the first reinforcing rib configured as described above can significantly reduce the risk of damage to the first flange extending from the outer peripheral surface of the first outer wall.

[0017] (8) In any of the above (1) to (7), the first core case and the second core case may have the same shape. In this way, the first core case and the second core case having the same shape can be fitted together to form the core unit. This makes it easy to improve productivity and reduce costs.

[0018] (9) In any of the above (1) to (8), the material of the first magnetic core may be different from the material of the second magnetic core. In this way, the first magnetic core and the second magnetic core can be configured to have different characteristics according to the requirements for the core unit. Therefore, the characteristics can be further improved.

[0019] (10) In any of the above (1) to (9), the axial length of the first flange may be equal to the sum of the axial length of the first outer wall and the axial length of the second outer wall. This prevents the first flange from protruding in the axial direction, and allows the size of the core unit to be made compact. Therefore, the installation space can be further reduced.

[0020] [Details of the embodiment of the present disclosure] Next, an embodiment of the core unit of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference characters, and the description thereof will not be repeated.

[0021] (Embodiment 1) The configuration of the core unit in the first embodiment of the present disclosure will be described. FIG. 1 is a schematic perspective view showing the appearance of the core unit in the first embodiment of the present disclosure. FIG. 2 is an exploded perspective view of the core unit shown in FIG. 1. FIG. 3 is a schematic bottom view of the core unit shown in FIG. 1. FIG. 4 is a schematic cross-sectional view taken along the line IV-IV in FIG. 1. FIG. 5 is a schematic cross-sectional view taken along the line VV in FIG. 1. In FIG. 1, two power lines are shown in schematic form when the core unit functions as a noise filter. In the figures shown in FIG. 1 and subsequent figures, the Z direction indicates the axial direction, and the X and Y directions indicate the radial directions. The X and Y directions are orthogonal to each other. In FIG. 2, the direction in which the first core case and the second core case described later are combined is indicated by an outlined arrow.

[0022] 1, 2, 3, 4, and 5, the core unit 10a is a core unit that holds a magnetic core, and is used, for example, as a noise filter for two baselines 11a and 12a that extend in the axial direction. The baselines 11a and 12a are electrical wiring components such as harnesses, bus bars, and electric wires through which current flows. The core unit 10a is provided with a circular through hole 13a that penetrates in the Z direction. The baselines 11a and 12a are each disposed in the through hole 13a that is provided in the core unit 10a and penetrates in the axial direction. Note that the baselines 11a and 12a are each illustrated simply. The core unit 10a is attached and fixed at a predetermined location.

[0023] The core unit 10a includes a ring-shaped first magnetic core 21a, a first core case 23a that houses the first magnetic core 21a, a ring-shaped second magnetic core 22a that is spaced apart from the first magnetic core 21a in the axial direction, and a second core case 24a that houses the second magnetic core 22a. That is, the core unit 10a includes two magnetic cores. In this embodiment, the first magnetic core 21a and the second magnetic core 22a are both ring-shaped. The first magnetic core 21a and the second magnetic core 22a are arranged side by side in the axial direction (Z direction). The Z direction is the direction in which the magnetic cores of the first magnetic core 21a and the second magnetic core 22a extend. The outer shape of the first magnetic core 21a is the same as the outer shape of the second magnetic core 22a. That is, the inner diameter dimension, outer diameter dimension and axial length of the first magnetic core 21a are the same as the inner diameter dimension, outer diameter dimension and axial length of the second magnetic core 22a, respectively.

[0024] The material of the first magnetic core 21a is different from the material of the second magnetic core 22a. That is, the core unit 10a includes the first magnetic core 21a and the second magnetic core 22a, each of which has different characteristics. Specifically, for example, when the core unit 10a is used as a noise filter, the first magnetic core 21a is for low frequencies and the second magnetic core 22a is for high frequencies. In this embodiment, the first magnetic core 21a and the second magnetic core 22a are each made of, for example, a nanocrystalline foil laminated with a plurality of sheets. In this way, the first magnetic core 21a and the second magnetic core 22a can be configured to have different characteristics according to the requirements for the core unit 10a. Therefore, the characteristics can be further improved.

[0025] The first core case 23a and the second core case 24a are each made of a resin. In this embodiment, the material of the first core case 23a and the second core case 24a is polybutylene terephthalate (PBT (Poly Butylene Terephthalate)). As the material of the first core case 23a and the second core case 24a, for example, at least one of materials consisting of a group consisting of PBT, polyphenylene sulfide (PPS (Poly Phenylene Sulfide)), polycarbonate (PC (Polycarbonate)), ABS (Acrylonitrile Butadiene Styrene) resin, and a composite material of PC and ABS resin may be selected.

[0026] Next, the configuration of the outer shape of the first core case 23a will be specifically described. FIG. 6 is a schematic front view and a schematic bottom view of the first core case 23a included in the core unit 10a shown in FIG. 1. In FIG. 6, the lower side is a schematic front view, and the upper side is a schematic bottom view. With reference to FIG. 6 as well, the first core case 23a is provided with a through hole 25a penetrating in the axial direction. The first core case 23a includes a first inner wall portion 31a, a first outer wall portion 32a, a first bottom wall portion 33a, and a first top wall portion 34a. The first magnetic core 21a is accommodated in a first space 35a surrounded by the first inner wall portion 31a, the first outer wall portion 32a, the first bottom wall portion 33a, and the first top wall portion 34a. The first inner wall portion 31a is disposed on the inner peripheral side of the first magnetic core 21a. The first inner wall portion 31a is a hollow cylinder. The first outer wall portion 32a is disposed on the outer periphery side of the first magnetic core 21a. The first outer wall portion 32a is a hollow cylinder having an inner diameter larger than that of the first inner wall portion 31a.

[0027] The first bottom wall portion 33a connects the first inner wall portion 31a and the first outer wall portion 32a. The first bottom wall portion 33a is disposed on one side in the axial direction of the first magnetic core 21a. The first bottom wall portion 33a is a plate-like portion disposed parallel to the XY plane. The first top wall portion 34a connects the first inner wall portion 31a and the first outer wall portion 32a. The first top wall portion 34a is disposed on the other side in the axial direction of the first magnetic core 21a. That is, the first top wall portion 34a is disposed at an interval from the first bottom wall portion 33a in the axial direction. The first top wall portion 34a is a plate-like portion disposed parallel to the XY plane. After the first magnetic core 21a is accommodated in the first core case 23a, the first top wall portion 34a is attached by bonding to the axial end portions of the first inner wall portion 31a and the first outer wall portion 32a so as to cover the first magnetic core 21a.

[0028] Here, the first core case 23a includes two plate-shaped first flanges 36a and 37a. That is, the first flanges 36a and 37a are provided as a pair. The first flanges 36a and 37a are each rectangular when viewed in the thickness direction. The first flanges 36a and 37a are provided so as to extend outward from the outer peripheral surface 38a of the first outer wall portion 32a. The pair of first flanges 36a and 37a are formed at positions rotated 180 degrees in the circumferential direction.

[0029] The first flange portion 36a and the first flange portion 37a each include a first protruding region 41a and a first protruding region 42a that protrude toward the second core case 24a in the axial direction. The axial length L of the first flange portion 36a including the first protruding region 41a is equal to the sum of the axial length of the first outer wall portion 32a and the axial length of the second outer wall portion 52a described below. The axial length L of the first flange portion 37a including the first protruding region 42a is equal to the sum of the axial length of the first outer wall portion 32a and the axial length of the second outer wall portion 52a.

[0030] The first flange 36a is formed with a first through hole 43a penetrating in the thickness direction of the first flange 36a. The first through hole 43a is round. The first through hole 44a described below and the second through hole 63a and second through hole 64a described below have the same shape. The first through hole 43a is provided in the center of the axial direction of the first flange 36a. The first through hole 43a is formed so as to include the portion where the first protruding region 41a is located. The first flange 37a is formed with a first through hole 44a penetrating in the thickness direction of the first flange 37a. The first through hole 44a is provided in the center of the axial direction of the first flange 37a. The first through hole 44a is formed so as to include the portion where the first protruding region 42a is located. The first through holes 43a and 44a are each used as a bolt hole for fixing the core unit 10a to a predetermined location when the core unit 10a is attached.

[0031] The second core case 24a has the same shape as the first core case 23a. The second core case 24a includes a second inner wall portion 51a, a second outer wall portion 52a, a second bottom wall portion 53a, and a second top wall portion 54a. The configurations of the second inner wall portion 51a, the second outer wall portion 52a, the second bottom wall portion 53a, and the second top wall portion 54a are the same as the configurations of the first inner wall portion 31a, the first outer wall portion 32a, the first bottom wall portion 33a, and the first top wall portion 34a, respectively, and their description will be omitted. The second magnetic core 22a is accommodated in a second space 55a surrounded by the second inner wall portion 51a, the second outer wall portion 52a, the second bottom wall portion 53a, and the second top wall portion 54a.

[0032] Similarly to the first core case 23a, the second core case 24a includes two plate-shaped second flanges 56a and 57a. The second flanges 56a and 57a are provided so as to extend outward from the outer peripheral surface 58a of the second outer wall portion 52a. The pair of second flanges 56a and 57a are formed at positions rotated 180 degrees in the circumferential direction.

[0033] The second flange portion 56a and the second flange portion 57a ​​each include a second protruding region 61a and a second protruding region 62a that protrude toward the first core case 23a in the axial direction. The axial length of the second flange portion 56a including the second protruding region 61a is equal to the sum of the axial length of the first outer wall portion 32a and the axial length of the second outer wall portion 52a. The axial length of the second flange portion 57a ​​including the second protruding region 62a is equal to the sum of the axial length of the first outer wall portion 32a and the axial length of the second outer wall portion 52a.

[0034] The second flange 56a is formed with a second through hole 63a penetrating in the thickness direction of the second flange 56a. The second through hole 63a is provided in the center of the axial direction of the second flange 56a. The second through hole 63a is formed so as to include the portion where the second protruding region 61a is located. The second flange 57a is formed with a second through hole 64a penetrating in the thickness direction of the second flange 57a. The second through hole 64a is provided in the center of the axial direction of the second flange 57a. The second through hole 64a is formed so as to include the portion where the second protruding region 62a is located. The second through hole 63a and the second through hole 64a are each used as a bolt hole for fixing the core unit 10a to a predetermined position when the core unit 10a is attached.

[0035] Here, the core unit 10a is configured by combining the first core case 23a and the second core case 24a such that the position of the first through hole 43a and the position of the second through hole 63a match when viewed in the thickness direction of the first flange portion 36a, the second protruding region 61a overlaps with the first flange portion 36a, and the first protruding region 41a overlaps with the second flange portion 56a. Also, the position of the first through hole 44a and the position of the second through hole 64a match when viewed in the thickness direction of the first flange portion 37a, the second protruding region 62a overlaps with the first flange portion 37a, and the first protruding region 42a overlaps with the second flange portion 57a. In this case, the central axis of the first magnetic core 21a and the central axis of the second magnetic core 22a are coaxial. In this manner, the first core case 23a and the second core case 24a are combined to form the core unit 10a. The core unit 10a is then fixed to a predetermined location with bolts using the first through hole 43a and the second through hole 63a, and the first through hole 44a and the second through hole 64a.

[0036] The core unit 10a includes a plurality of magnetic cores, such as the first magnetic core 21a and the second magnetic core 22a, and therefore can maintain high impedance at high frequencies and improve characteristics, compared to a case where one large magnetic core is included. In this case, the size of each magnetic core can be reduced, and productivity can be improved. The first core case 23a that houses the first magnetic core 21a includes a first flange 36a and a first flange 37a that protrude outward from the outer circumferential surface 38a of the first outer wall portion 32a, and the second core case 24a that houses the second magnetic core 22a includes a second flange 56a and a second flange 57a that protrude outward from the outer circumferential surface 58a of the second outer wall portion 52a. The core unit 10a is configured by combining the first core case 23a and the second core case 24a such that the second protruding region 61a overlaps the first flange portion 36a and the first protruding region 41a overlaps the second flange portion 56a. The first core case 23a and the second core case 24a are also configured by combining the second protruding region 62a overlaps the first flange portion 37a and the first protruding region 42a overlaps the second flange portion 57a. Therefore, the first flange portion 36a and the second flange portion 56a, and the first flange portion 37a and the second flange portion 57a ​​can be overlapped and fixed while shortening the axial length. This makes it possible to reduce the space in the parallel direction when mounting the core unit 10a, compared to the case where two conventional core fixing structures are arranged in parallel. In this case, the first flange portion 36a, the first flange portion 37a, and the second flange portion 56a, the second flange portion 57a ​​can secure sufficient space for fixing the stacked and assembled first core case 23a and the second core case 24a. Therefore, the assembled state of the first core case 23a and the second core case 24a can be reliably maintained while being made more compact. As described above, the core unit 10a has good characteristics and can reduce the mounting space.

[0037] In this embodiment, the first flange 36a and the first flange 37a are formed with a first through hole 43a and a first through hole 44a penetrating in the thickness direction, respectively. The second flange 56a and the second flange 57a are formed with a second through hole 63a and a second through hole 64a penetrating in the thickness direction, respectively. The core unit 10a is configured by combining the first flange 36a and the second flange 37a such that the position of the first through hole 43a and the position of the second through hole 64a match when viewed in the thickness direction, and the position of the first through hole 44a and the position of the second through hole 63a match when viewed in the thickness direction. Therefore, by utilizing the first through hole 43a and the second through hole 64a, and the first through hole 44a and the second through hole 63a, the body of the bolt can be passed through the first through hole 43a and the second through hole 64a, the body of the bolt can be passed through the first through hole 44a and the second through hole 63a, and the first flange portion 36a and the second flange portion 57a, and the first flange portion 37a and the second flange portion 56a can be overlapped and fixed. In this case, the first flange portion 36a, the first flange portion 37a include the first protruding region 41a, the first protruding region 42a protruding toward the second core case 24a, and the second flange portion 56a, the second flange portion 57a ​​include the second protruding region 61a, the second protruding region 62a protruding toward the first core case 23a, so that the first flange portion 36a, the first flange portion 37a and the second flange portion 56a, the second flange portion 57a ​​have sufficient space for providing the first through hole 43a, the first through hole 44a and the second through hole 63a, the second through hole 64a available for fastening the bolts. Therefore, the first core case 23a and the second core case 24a can be fixed more reliably when combined.

[0038] In this embodiment, the first flange portion 36a, the first flange portion 37a, the second flange portion 56a, and the second flange portion 57a ​​are each included in a plurality. Therefore, the core unit 10a can be fixed by using the plurality of first flange portions 36a, the first flange portions 37a, and the plurality of second flange portions 56a, the second flange portions 57a. Therefore, the fixed state of the core unit 10a can be more reliably maintained.

[0039] In this embodiment, the first flange portion 36a and the first flange portion 37a are provided as a pair. The pair of the first flange portion 36a and the first flange portion 37a are formed at positions rotated 180 degrees in the circumferential direction. The second flange portion 56a and the second flange portion 57a ​​are provided as a pair. The pair of the second flange portion 56a and the second flange portion 57a ​​are formed at positions rotated 180 degrees in the circumferential direction. Therefore, the core unit 10a can be stably fixed by the bolt at positions facing each other by 180 degrees. Therefore, the core unit 10a can be fixed more stably.

[0040] In this embodiment, the first core case 23a and the second core case 24a have the same shape. Therefore, the first core case 23a and the second core case 24a having the same shape can be fitted together to form the core unit 10a. Therefore, it is easy to improve productivity and reduce costs.

[0041] In this embodiment, the material of the first magnetic core 21a is different from the material of the second magnetic core 22a. Therefore, the first magnetic core 21a and the second magnetic core 22a can be configured to have different characteristics according to the requirements for the core unit 10a. Therefore, the characteristics can be further improved.

[0042] In this embodiment, the axial length of the first flange portion 36a and the first flange portion 37a is equal to the sum of the axial length of the first outer wall portion 32a and the axial length of the second outer wall portion 52a. Therefore, the first flange portion 36a and the first flange portion 37a can be prevented from protruding in the axial direction, and the size of the core unit 10a can be made compact. Therefore, the mounting space can be further reduced.

[0043] (Embodiment 2) A second embodiment, which is another embodiment, will now be described. FIG. 7 is a schematic perspective view showing the appearance of a core unit in the second embodiment. FIG. 8 is an exploded perspective view of the core unit shown in FIG. 7. FIG. 9 is a schematic cross-sectional view taken along the line IX-IX in FIG. 7. The core unit 10b in the second embodiment basically has the same configuration as the first embodiment, and achieves the same effects. However, the core unit 10b in the second embodiment differs from the first embodiment in that the shape of the first flange is different, etc.

[0044] 7, 8 and 9, the core unit 10b in the second embodiment includes the first magnetic core 21a shown in the first embodiment, the first core case 23b accommodating the first magnetic core 21a, the second magnetic core 22a shown in the first embodiment, and the second core case 24b accommodating the second magnetic core 22a. The first flange 37b includes a first fitting portion 45b. The first fitting portion 45b is hollow cylindrical. The first fitting portion 45b extends in the thickness direction of the first flange 37b along the inner edge of the first through hole 44a. The first fitting portion 45b fits into the second through hole 63a when the first core case 23b and the second core case 24b are combined. Similarly, the second flange 57b of the second core case 24b includes a second fitting portion 65b. The second fitting portion 65b is hollow cylindrical. The second fitting portion 65b extends in the thickness direction of the second flange portion 57b along the inner edge of the second through hole 64a. The second fitting portion 65b fits into the first through hole 43a when the first core case 23b and the second core case 24b are assembled. The core unit 10b is fixed to a predetermined location by the bolts 14b and 15b using the first through hole 44a and the second through hole 63a.

[0045] According to this embodiment, since the first fitting portion 45b is fitted into the second through hole 63a, the risk of the second flange portion 56b being displaced relative to the first flange portion 37b can be greatly reduced. This makes it possible to suppress the positional displacement of the second flange portion 56b relative to the first flange portion 37b, and to easily avoid a situation in which the first flange portion 37b and the second flange portion 56b rub against each other due to vibration or the like. Therefore, the fixed state of the core unit 10b can be stably maintained for a longer period of time. In addition, in this case, since the second fitting portion 65b is fitted into the first through hole 43a, the risk of the first flange portion 36b being displaced relative to the second flange portion 57b can be greatly reduced. This makes it possible to suppress misalignment of the first flange portion 36b with respect to the second flange portion 57b, and to easily avoid a situation in which the first flange portion 36b and the second flange portion 57b rub against each other due to vibration, etc. Therefore, the fixed state of the core unit 10b can be maintained stably for a longer period of time.

[0046] (Embodiment 3) Another embodiment, embodiment 3, will now be described. Fig. 10 is an exploded perspective view of a core unit in embodiment 3. A core unit 10c in embodiment 3 basically has the same configuration as in embodiment 2, and achieves the same effects. However, the core unit 10c in embodiment 3 differs from embodiment 2 in that it includes a partition plate.

[0047] 10, a core unit 10c in the third embodiment includes the first magnetic core 21a shown in the first embodiment, a first core case 23c that houses the first magnetic core 21a, the second magnetic core 22a shown in the first embodiment, and a second core case 24c that houses the second magnetic core 22a. The first core case 23c does not include a first top wall portion 34a. The second core case 24c does not include a second top wall portion 54a.

[0048] The core unit 10c of the third embodiment includes a partition plate 46c. The partition plate 46c is disk-shaped. A through hole 47c is provided in the center of the partition plate 46c, penetrating in the axial direction similar to the through hole 13a. The partition plate 46c is disposed between the first magnetic core 21a and the second magnetic core 22a. That is, the first magnetic core 21a is disposed on one side of the partition plate 46c in the axial direction, and the second magnetic core 22a is disposed on the other side of the partition plate 46c in the axial direction.

[0049] According to this embodiment, the partition plate 46c can reduce the risk of contact between the first magnetic core 21a and the second magnetic core 22a, and therefore the risk of damage to the core unit 10c can be significantly reduced.

[0050] (Embodiment 4) A fourth embodiment, which is another embodiment, will now be described. Fig. 11 is a schematic perspective view showing the appearance of a core unit in the fourth embodiment. Fig. 12 is an exploded perspective view of the core unit shown in Fig. 11. The core unit 10d in the fourth embodiment basically has the same configuration as in the second embodiment, and achieves the same effects. However, the core unit 10d in the fourth embodiment differs from the second embodiment in that it includes a first reinforcing rib.

[0051] 11 and 12, the core unit 10d in the fourth embodiment includes the first magnetic core 21a shown in the first embodiment, a first core case 23d that houses the first magnetic core 21a, the second magnetic core 22a shown in the first embodiment, and a second core case 24d that houses the second magnetic core 22a. The core unit 10d includes a first reinforcing rib 48d and a second reinforcing rib 49d. The first reinforcing rib 48d is provided to connect the axial end of the first flange 36d and the outer peripheral surface 38d of the first outer wall 32d. The second reinforcing rib 49d is provided to connect the axial end of the second flange 56d and the outer peripheral surface 58d of the second outer wall 52d.

[0052] According to this embodiment, the first reinforcing rib 48d configured as described above can significantly reduce the risk of damage to the first flange 36d extending from the outer circumferential surface 38d of the first outer wall portion 32d. Also, the second reinforcing rib 49d can significantly reduce the risk of damage to the second flange 56d extending from the outer circumferential surface 58d of the second outer wall portion 52d.

[0053] (Other embodiments) In the above embodiment, the magnetic core is obtained by stacking and sintering multiple sheets of nanocrystalline foil, but this is not limited to the above, and the magnetic core may be a ferrite core, an electromagnetic steel core, a powder core, or an amorphous core.

[0054] In the above embodiment, the first flange portion and the second flange portion may be provided on the core unit, and the first core case and the second core case may have different shapes.

[0055] In the above embodiment, the first through hole and the second through hole are circular, but the present invention is not limited to this. As long as the through hole is a through hole, it may be an elliptical hole or a polygonal hole, or may be a notch-like shape that constitutes more than half of the area of ​​the circular hole. That is, for example, the circular hole may be an arc-like shape when viewed from the thickness direction, such that a part of the circular hole reaches the end face on the outer side of the first flange. For example, one of the through holes may be a circular hole, and the other through hole may be a notch-like shape.

[0056] In addition, in the above embodiment, the first magnetic core and the second magnetic core are each circular, but this is not limited to the above, and the first magnetic core and the second magnetic core may each be configured to have an elliptical or polygonal through hole.

[0057] In the above embodiment, the first flange has a first through hole penetrating in the thickness direction, and the second flange has a second through hole penetrating in the thickness direction, but this is not limited thereto, and the first through hole and the second through hole may not be provided. In this case, for example, after arranging the second protruding region so that it overlaps with the first flange and the first protruding region so that it overlaps with the second flange, the second protruding region and the first flange, and the first protruding region and the second flange may be fastened in the thickness direction by a fastening member such as a clamp.

[0058] It should be understood that the embodiments disclosed herein are illustrative in all respects and are not limiting in any respect. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0059] 10a, 10b, 10c, 10d Core Unit 11a,12a Baseline 13a, 47c through hole 14b,15b Bolts 21a First magnetic core 22a Second magnetic core 23a, 23b, 23c, 23d First core case 24a, 24b, 24c, 24d First core case 31a 1st inner wall part 32a,32d 1st outer wall part 33a 1st bottom wall part 34a 1st ceiling wall section 35a 1st space 36a,36b,36c,37a 1st flange 38a,38d,58a,58d Outer surface 41a,42a 1st protruding area 43a, 43b, 44a, 44b First through hole 45b First fitting portion 46c Partition 48d First reinforcing rib 49d Second reinforcing rib 51a 2nd inner wall part 52a, 52d Second outer wall 53a 2nd bottom wall part 54a Second ceiling wall 55a Second Space 56a,56b,56d,57a 2nd collar 61a,62a 2nd protruding area 63a,63b,64a,64b 2nd through hole L Length

Claims

1. A core unit for holding a magnetic core, an annular first magnetic core; a first core case that accommodates the first magnetic core; a second magnetic core having an annular shape and spaced apart from the first magnetic core in the axial direction; a second core case arranged axially next to the first core case and housing the second magnetic core; The first core case includes: A first outer wall portion disposed on an outer circumferential side of the first magnetic core; a first flange portion having a plate shape and extending outward from an outer circumferential surface of the first outer wall portion, The second core case includes: A second outer wall portion disposed on an outer circumferential side of the second magnetic core; a plate-shaped second flange portion provided so as to extend outward from an outer circumferential surface of the second outer wall portion, the first flange portion includes a first protruding region that protrudes toward the second core case in the axial direction, the second flange portion includes a second protruding region protruding toward the first core case in the axial direction, The core unit is configured by combining the first core case and the second core case such that the second protruding region overlaps with the first flange portion and the first protruding region overlaps with the second flange portion.

2. The first flange portion has a first through hole formed therethrough in a thickness direction, The second flange portion has a second through hole formed therethrough in a thickness direction, The core unit according to claim 1 , wherein the core unit is configured by assembling the first through hole and the second through hole so that the position of the first through hole coincides with the position of the second through hole when viewed in a thickness direction of the first flange portion.

3. The core unit according to claim 1 or 2, wherein a plurality of the first flange portions and a plurality of the second flange portions are included.

4. The first flange portion is provided in pair, The pair of first flanges are formed at positions rotated 180 degrees in the circumferential direction, The second flange portion is provided in pair, The core unit according to claim 3 , wherein the pair of second flange portions are formed at positions rotated 180 degrees in the circumferential direction.

5. The core unit described in claim 2, wherein the first flange portion is hollow cylindrical and extends in the thickness direction of the first flange portion along the inner edge of the first through hole, and includes a first fitting portion that fits into the second through hole when the first core case and the second core case are combined.

6. The core unit according to claim 1 or 2, further comprising a partition plate disposed between the first magnetic core and the second magnetic core.

7. The first core case includes a first reinforcing rib, 3 . The core unit according to claim 1 , wherein the first reinforcing rib is provided so as to connect an axial end of the first flange portion and an outer circumferential surface of the first outer wall portion.

8. The core unit according to claim 1 or 2, wherein the first core case and the second core case have the same shape.

9. The core unit according to claim 1 or 2, wherein a material of the first magnetic core is different from a material of the second magnetic core.

10. The core unit according to claim 1 or 2, wherein an axial length of the first flange portion is equal to a sum of an axial length of the first outer wall portion and an axial length of the second outer wall portion.

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