Noise reduction device and wire harness

Abstract

To suppress initial cost low while securing durability.SOLUTION: A noise reduction tool comprises: a plurality of columnar magnetic substance cores 11 extending in a column axis direction; a sheet-like or belt-like core holding member 21 for holding the plurality of magnetic substance cores 11 and capable of being wound for at least one round around an axis of a wire We or a wire bundle Web obtained by bundling a plurality of wires into one with respect to the wire We or the wire bundle Web; and a fixing member 31 for fixing the core holding member 21 to the wire We or the wire bundle Web while keeping a winding shape of the core holding member 21 wound around the wire We or the wire bundle Web. The core holding member 21 holds the magnetic substance cores 11 around the axis of the wire We or the wire bundle Web in the winding shape while arranging them one by one at equal intervals over at least one round and includes a core holding section 21b for each magnetic substance core 11 for holding each magnetic substance core 11 while matching the column axis direction with a winding axis direction of the winding shape, and the core holding section 21b is formed as a fitting part to which the magnetic substance core 11 is fitted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a noise reducing device and a wire harness. [Background technology]

[0002] Noise reducers are components made of magnetic materials and are attached to electric wires carrying noise currents to reduce the external emission of radiated noise from the electric wires. For example, a noise reducer may include two semi-cylindrical magnetic bodies (so-called ferrite cores) that are combined to form a cylindrical shape, with the electric wire inserted into the inner space. However, noise reducers using such magnetic bodies are difficult to use for electric wires with significantly different diameters, and even the use of components for electric wires with significantly different diameters is difficult. For this reason, a noise reducer whose components are at least compatible with electric wires of different diameters is desired in this technical field. For example, Patent Document 1 listed below discloses a noise reducer with a chain structure in which two types of magnetic bodies are alternately arranged and adjacent cylindrical magnetic bodies are connected to each other with an elastic member and a pin. Patent Document 2 listed below also discloses a noise reducer in which multiple trapezoidal columnar magnetic bodies are bonded to a film and wrapped around an electric wire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-374090 [Patent Document 2] Japanese Patent Application Publication No. 7-297588 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the noise reducer of Patent Document 1 has a complex structure due to the large number of components, making it difficult to reduce costs from the standpoint of productivity, etc. Furthermore, the noise reducer of Patent Document 2 adheres the magnetic material and film with an adhesive, making it difficult to ensure durability from the standpoint of heat resistance, aging, etc.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a noise reducer and a wire harness that can keep costs low while ensuring durability. [Means for solving the problem]

[0006] The noise reducer according to the present invention comprises a plurality of columnar magnetic cores extending in a column axis direction, and a sheet-like or strip-like core holding member that holds the plurality of magnetic cores and can be wound around the axis of an electric wire or an electric wire bundle formed by bundling a plurality of electric wires together at least once, wherein the core holding member holds the magnetic cores in a wound shape wound around the electric wire or the electric wire bundle, arranging each of the magnetic cores at equal intervals one by one for at least one turn around the axis of the electric wire or the electric wire bundle, and has a core holding portion for each of the magnetic cores that holds each of the magnetic cores with the column axis direction aligned in the winding axis direction of the wound shape, and the core holding portion is formed as a fitting portion into which the magnetic cores are fitted.

[0007] Moreover, a wire harness according to the present invention comprises an electric wire or an electric wire bundle obtained by bundling a plurality of electric wires together, and a noise reducer that reduces external emission of radiated noise emitted from the electric wires or the electric wire bundle, wherein the noise reducer comprises a plurality of columnar magnetic cores extending in a column axis direction, and a sheet-like or strip-like core holding member that holds the plurality of magnetic cores and can be wound around the axis of the electric wires or the electric wire bundle at least once, wherein the core holding member is wound around the electric wires or the electric wire bundle in a wound shape and holds the magnetic cores arranged at equal intervals one by one for at least one turn around the axis of the electric wires or the electric wire bundle, and has a core holding portion for each of the magnetic cores that holds each of the magnetic cores with the column axis direction aligned in the winding axis direction of the winding shape, and the core holding portion is a fitting portion into which the magnetic cores are fitted. [Effects of the Invention]

[0008] The noise reducer according to the present invention has a simple structure in which its main components are only a magnetic core and a core holding member, and the magnetic core and the core holding member are simply fitted together. This makes the noise reducer highly productive and reduces costs. Furthermore, this noise reducer does not use adhesive between the magnetic core and the core holding member, nor does it use adhesive to secure the core holding member to the electric wire We or the electric wire bundle Web while maintaining the wound shape of the core holding member. This noise reducer is therefore highly heat-resistant and resistant to deterioration over time, ensuring high durability. Thus, the noise reducer according to the present invention can keep costs low while ensuring high durability. Furthermore, the wire harness according to the present invention includes this noise reducer and can achieve the same effects as those obtained by this noise reducer. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view schematically showing a wire harness to which a noise reducer according to an embodiment is attached. [Figure 2] FIG. 2 is a schematic view of a wire harness to which a noise reducer according to an embodiment is attached, viewed in the axial direction. [Figure 3] FIG. 3 is a plan view schematically showing the noise reducer before assembly. [Figure 4] FIG. 4 is a perspective view showing a magnetic core according to the embodiment. [Figure 5] FIG. 5 is a schematic view of another usage form of the wire harness to which the noise reducer of the embodiment is attached, as viewed in the axial direction. [Figure 6] FIG. 6 is a schematic view of a wire harness to which a noise reducer according to the first modification is attached, viewed in the axial direction. [Figure 7] FIG. 7 is a perspective view showing a magnetic core of the first modification. [Figure 8] FIG. 8 is a schematic view of a wire harness to which a noise reducer according to the second modification is attached, viewed in the axial direction. [Figure 9] FIG. 9 is a perspective view showing a magnetic core of the second modification. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a noise reducer and a wire harness according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments.

[0011] [Embodiment] One embodiment of a noise reducer and a wire harness according to the present invention will be described with reference to FIGS. 1 to 5. FIG.

[0012] Reference numeral 1 shown in Figs. 1 to 3 denotes a noise reducer of this embodiment. This noise reducer 1 is attached to an electric wire We through which a noise current flows, to reduce the external emission of radiated noise emitted from this electric wire We. Alternatively, this noise reducer 1 is attached to an electric wire bundle Web formed by bundling together multiple electric wires, including an electric wire We through which a noise current flows, to reduce the external emission of radiated noise emitted from this electric wire bundle Web (the electric wire We through which a noise current flows among the multiple electric wires). Reference numeral WH shown in Figs. 1 and 2 denotes a wire harness in which the noise reducer 1 is assembled to the electric wire We or the electric wire bundle Web. One or more noise reducers 1 are provided depending on the length of the electric wire We or the electric wire bundle Web.

[0013] This wire harness WH is mounted on an electric vehicle (not shown), such as a BEV (Battery Electric Vehicle) or a PHEV (Plug-in Hybrid Electric Vehicle). As a specific example, this wire harness WH physically and electrically connects the auxiliary secondary battery to a DC / DC converter interposed between the drive secondary battery and the auxiliary secondary battery of the electric vehicle. This wire harness WH is responsible for supplying power from the drive secondary battery to the auxiliary secondary battery when charging the auxiliary secondary battery.

[0014] Moreover, the wire harness WH is used, for example, in a charging system (not shown) for charging a drive secondary battery and an auxiliary secondary battery of an electric vehicle.

[0015] This charging system is configured for normal or rapid charging, regardless of whether it is for commercial or home use. This charging system includes an external power source, a charger main unit that receives power from the external power source, and a charging cable with a connector for supplying power from the charger main unit to the vehicle. The charging cable with a connector is used by an operator when supplying power and includes a charging cable with at least a power line (electric line We) and a charging connector attached to one end of the charging cable. Some charging systems control charging by communicating between the vehicle and the charger main unit when supplying power. In this case, the charging cable also includes a communication signal line for carrying out this communication.

[0016] For example, if this charging system is configured for rapid charging, a three-phase AC power supply is used as the external power supply, and an AC / DC converter that converts the AC voltage to DC voltage is housed inside the housing of the charger body. In this case, the charging cable with connector supplies the converted power to the vehicle.

[0017] The charging cable with connector may be pre-assembled to the charger main body and may constitute the charger together with the charger main body. When charging, this charging cable with connector is routed from the charger main body to the vehicle side, and the charging connector is physically and electrically connected to the connector of the electric vehicle (vehicle-side connector).

[0018] On the other hand, the charging cable with connector may be a separate component that is stored in the trunk of a vehicle, with the power connector attached to the other end of the charging cable. In this case, the charger main body constitutes the charger. When charging, this charging cable with connector physically and electrically connects the power connector to the connector of the charger main body, and also physically and electrically connects the charging connector to the vehicle connector.

[0019] In this charging system, an internal charging cable is provided within the housing of the charger main body, electrically connecting the AC / DC converter side and the charging cable side. This internal charging cable includes at least an internal power line (electric wire We), which electrically connects the AC / DC converter side and the charging cable side. Therefore, in this charging system, the internal charging cable with the noise reduction device 1 attached constitutes the wire harness WH of this embodiment. Note that, if communication is to be performed during charging, the internal charging cable also has an internal communication signal line. Furthermore, in this charging system, the wire harness WH of this embodiment constitutes the charging cable of a connector-equipped charging cable with the noise reduction device 1 attached.

[0020] The noise reducer 1 and the wire harness WH of this embodiment will be specifically described below.

[0021] The noise reducer 1 includes a plurality of columnar magnetic cores 11 extending in the column axis direction, and a core holding member 21 that holds the plurality of magnetic cores 11 (FIGS. 1 to 3).

[0022] The magnetic core 11 is made of a ferromagnetic material, such as ferrite. The magnetic core 11 shown here is cylindrical (FIGS. 1 to 4). All of the magnetic cores 11 shown here are molded to the same shape (FIGS. 1 to 3).

[0023] The core holding member 21 is formed in a sheet or band shape that can be wound around the electric wire We or the electric wire bundle Web at least once around the axis of the electric wire We or the electric wire bundle Web ( FIGS. 1 to 3 ). For example, the core holding member 21 has a main body 21a that is formed in a flat sheet or band shape before being wound around the electric wire We or the electric wire bundle Web ( FIG. 3 ), and this flat main body 21a is wound around the electric wire We or the electric wire bundle Web ( FIGS. 1 and 2 ). For this reason, the core holding member 21 is formed from a flexible synthetic polymer material (synthetic resin, synthetic rubber, elastomer, etc.).

[0024] The core holding member 21 has a main body 21a and a core holding portion 21b for each magnetic core 11 (FIGS. 1 to 3). Specifically, the core holding member 21 is wound around the electric wire We or the electric wire bundle Web in a wound shape, and holds the magnetic cores 11 arranged at equal intervals one by one for at least one turn around the axis of the electric wire We or the electric wire bundle Web, and has a core holding portion 21b for each magnetic core 11 that holds each magnetic core 11 with the column axis direction aligned with the winding axis direction of the wound shape.

[0025] The core holding portion 21b is formed as a fitting portion into which the magnetic core 11 is fitted. The core holding portion 21b shown here is formed as a cylindrical space into which the cylindrical magnetic core 11 can be fitted by press-fitting or the like along the column axis direction.

[0026] Furthermore, the core holding member 21 may be produced, for example, by using an insert molding technique in which multiple magnetic cores 11 are placed in a mold, so that each magnetic core 11 is fitted into each core holding portion 21b.

[0027] When this noise reducer 1 is wound around the electric wire We or the electric wire bundle Web, the smaller the circumferential gap between adjacent magnetic cores 11, the more efficiently it can provide resistance to the magnetic field, and therefore the more effectively it can reduce the external emission of radiated noise from the electric wire We or the electric wire bundle Web (the electric wire We among multiple electric wires through which a noise current flows). For this reason, in this noise reducer 1, the circumferential gap between adjacent magnetic cores 11 when wound can be reduced by, for example, narrowing the gap between adjacent core holding portions 21b of the core holding member 21 in accordance with the required amount of reduction in radiated noise.

[0028] Furthermore, to further reduce the external emission of radiated noise, the noise reduction device 1 may be wound around the axis of the electric wire We or the electric wire bundle Web multiple times so that, when the noise reduction device 1 is in a wound shape, the magnetic core 11 is present radially around the entire circumference between the axial center of the electric wire We or the electric wire bundle Web and the outermost peripheral surface of the core holding member 21. Fig. 5 schematically shows an example in which the noise reduction device 1 is wound around the electric wire We or the electric wire bundle Web one or more times. In this example, the circumferential gap between adjacent magnetic cores 11 when the noise reduction device 1 is in a wound shape may be reduced, or the magnetic core 11 may be present radially between the axial center of the electric wire We or the electric wire bundle Web and the outermost peripheral surface of the core holding member 21 when the noise reduction device 1 is in a wound shape.

[0029] Furthermore, when the noise reduction device 1 is wound around the electric wire We or the electric wire bundle Web, adjacent magnetic cores 11 come into contact with each other, thereby providing highly efficient resistance to the magnetic field. This further reduces the external emission of radiated noise from the electric wire We or the electric wire bundle Web (the electric wire We among multiple electric wires through which a noise current flows). For example, the core holding member 21 shown here has a communicating portion 21c that connects two adjacent core holding portions 21b and brings the magnetic cores 11 held by these two core holding portions 21b into contact with each other in the wound shape (FIG. 2). This communicating portion 21c is, for example, a portion of the wall between two adjacent core holding portions 21b cut out in the hole axis direction (winding axis direction) of the core holding portions 21b, and is provided for each pair of adjacent core holding portions 21b. When the core holding member 21 is cut, the main body 21a is divided into two portions 21d and 21e with the communicating portions 21c in between. For this reason, in the core holding member 21, a wall portion connecting the two portions 21d and 21e is provided at one end of the core holding portion 21b in the column axis direction (not shown).

[0030] Here, the noise reducer 1 includes a fixing member 31 that fixes the core holding member 21 to the electric wire We or the electric wire bundle Web while maintaining the wound shape of the core holding member 21 (FIG. 2). This fixing member 31 is, for example, a cable tie that is wrapped around the wound core holding member 21, and one or more fixing members 31 are provided depending on the length in the winding axis direction.

[0031] As described above, the noise reducer 1 of this embodiment has a simple structure in which its main components are the magnetic core 11 and the core holding member 21, and the magnetic core 11 and the core holding member 21 are simply fitted together. This makes the noise reducer 1 highly productive and reduces costs. Furthermore, the noise reducer 1 does not use adhesive between the magnetic core 11 and the core holding member 21, nor does it use adhesive to secure the core holding member 21 to the electric wire We or the electric wire bundle Web while maintaining the wound shape of the core holding member 21. This makes the noise reducer 1 highly heat-resistant and resistant to changes over time, ensuring high durability. Thus, the noise reducer 1 of this embodiment can keep costs low while ensuring high durability. Therefore, by applying this noise reducer 1 to the electric vehicles and charging systems (regardless of whether they are for normal charging or rapid charging), it is possible to ensure high durability and reduce costs in these electric vehicles and charging systems, thereby contributing to the spread of electric vehicles and charging systems. The wire harness WH of this embodiment is equipped with this noise reducer 1, and can achieve the same effects as those obtained by this noise reducer 1.

[0032] Furthermore, a charging system configured for rapid charging is more likely to generate noise than a charging system configured for normal charging. Therefore, the noise reducer 1 and wire harness WH of this embodiment are particularly useful in a charging system for rapid charging and an electric vehicle that can be rapid charged using such a charging system.

[0033] Incidentally, in the noise reducer 1 of this embodiment, a sheet-like base material may be prepared (not shown) from which multiple core holding members 21 can be cut out. In this case, core holding members 21 of lengths or widths corresponding to the diameters of the electric wires We or electric wire bundles Web can be cut out from the base material, and multiple core holding members 21 of different lengths or widths adapted to electric wires We or electric wire bundles Web of different diameters can be produced from a single base material. Therefore, the noise reducer 1 and wire harness WH of this embodiment can be said to be even more useful in this respect as well, as they enable cost reduction.

[0034] [Variation 1] The noise reducer 2 of this modified example is obtained by replacing the magnetic core 11 and the core holding member 21 of the noise reducer 1 of the above-described embodiment with a magnetic core 12 and a core holding member 22, respectively (FIG. 6). This noise reducer 2 includes a fixing member 32 similar to the fixing member 31 included in the noise reducer 1 of the embodiment (FIG. 6).

[0035] The magnetic core 12 is made of a ferromagnetic material such as ferrite. The magnetic core 12 of this modified example is formed into a trapezoidal column shape, with a cross section perpendicular to the column axis direction being a trapezoid (FIGS. 6 and 7). The magnetic core 12 shown here is formed into a trapezoidal column shape, with a cross section perpendicular to the column axis direction being an isosceles trapezoid. All of the magnetic cores 12 are formed into the same shape (FIG. 6).

[0036] Although the thickness of the main body 22a of the core holding member 22 is different, it is similar to the core holding member 21 of the previously described embodiment and is molded from a flexible synthetic polymer material (synthetic resin, synthetic rubber, elastomer, etc.) (FIG. 6). Like the core holding member 21 of the previously described embodiment, this core holding member 22 has a core holding portion 22b in the main body 22a for each magnetic core 12 (FIG. 6). In this modification, the core holding portion 22b is also formed as a fitting portion into which the magnetic core 12 is fitted.

[0037] However, the core holding portion 22b of this modification is formed so that the magnetic cores 12 are fitted at their lower portions so that the upper portions of the magnetic cores 12 are positioned on the electric wire We side or the electric wire bundle Web side in the radial direction of the wound shape, and the upper portions of two adjacent magnetic cores 12 contact each other in the wound shape for each combination ( FIG. 6 ). This core holding portion 22b is formed as a trapezoidal columnar space into which the lower portions of the magnetic cores 12 can be fitted. For example, the lower portion of the magnetic core 12 is fitted into the core holding portion 22b by press-fitting or the like along the columnar axis direction.

[0038] Furthermore, the core holding member 22 may be produced, for example, by using insert molding technology to place multiple magnetic cores 12 in a mold, with the lower bottom side of each magnetic core 12 fitted into each core holding portion 22b.

[0039] The noise reducer 2 and wire harness WH of this modified example can obtain the same effects as the noise reducer 1 and wire harness WH of the above-described embodiment, even though such a trapezoidal columnar magnetic core 12 is used. Therefore, like the noise reducer 1 and wire harness WH of the embodiment, the noise reducer 2 and wire harness WH can be applied to electric vehicles and charging systems, thereby contributing to the widespread use of electric vehicles and charging systems.

[0040] Furthermore, a charging system configured for rapid charging is more likely to generate noise than a charging system configured for normal charging. Therefore, the noise reducer 2 and wire harness WH of this modified example are particularly useful in a charging system for rapid charging and an electric vehicle that can be rapid charged using such a charging system.

[0041] [Variation 2] The noise reducer 3 of this modified example is obtained by replacing the magnetic core 11 and the core holding member 21 of the noise reducer 1 of the above-described embodiment with a magnetic core 13 and a core holding member 23, respectively (FIG. 8). This noise reducer 3 is provided with a fixing member 33 similar to the fixing member 31 provided in the noise reducer 1 of the embodiment (FIG. 8).

[0042] The magnetic cores 13 are made of a ferromagnetic material such as ferrite. The magnetic cores 13 of this modified example are formed into the shape of a triangular prism whose cross section perpendicular to the column axis is an equilateral triangle (FIGS. 8 and 9). All of the magnetic cores 13 are formed into the same shape (FIG. 8).

[0043] Although the thickness of the main body 23a of the core holding member 23 is different, it is similar to the core holding member 21 of the previously described embodiment and is molded from a flexible synthetic polymer material (synthetic resin, synthetic rubber, elastomer, etc.) (FIG. 8). Like the core holding member 21 of the previously described embodiment, this core holding member 23 has a core holding portion 23b in the main body 23a for each magnetic core 13 (FIG. 8). In this modification, the core holding portion 23b is also formed as a fitting portion into which the magnetic core 13 is fitted.

[0044] However, in this modified example, the magnetic core 13 is fitted at its bottom side into the core holding portion 23b so that the apex of the magnetic core 13 is located on the electric wire We side or the electric wire bundle Web side in the radial direction of the wound shape ( FIG. 8 ). This core holding portion 23b is formed as a trapezoidal columnar space into which the bottom side of the magnetic core 13 can be fitted. For example, the bottom side of the magnetic core 13 is fitted into the core holding portion 23b by press-fitting or the like along the columnar axis direction.

[0045] Furthermore, the core holding member 23 may be produced, for example, by using insert molding technology to place multiple magnetic cores 13 in a mold, so that the bottom side of each magnetic core 13 is fitted into each core holding portion 23b.

[0046] The core holding member 23 of this modified example also has a communicating portion 23c that communicates two adjacent core holding portions 23b and allows the bottoms of the magnetic cores 13 held by the two core holding portions 23b to contact each other in a wound shape (FIG. 8). This communicating portion 23c is, for example, a portion of the wall between two adjacent core holding portions 23b cut out in the hole axis direction (winding axis direction) of the core holding portions 23b, and is provided for each pair of adjacent core holding portions 23b. Here, the vertices of the bottoms of two adjacent magnetic cores 13 are brought into contact with each other via this communicating portion 23c. Furthermore, in this core holding member 23, a wall portion (not shown) is provided at one end of the core holding portion 23b in the column axis direction to connect the walls 23d remaining on the apex side of the magnetic core 13 closer to the communicating portion 23c when the core holding portion 23b is cut out, and to connect these to the bottom side 23e of the magnetic core 13 closer to the communicating portion 23c.

[0047] Even if the noise reducer 3 of this modified example uses such a triangular prism-shaped magnetic core 13, it is possible to obtain the same effects as the noise reducer 1 of the above-described embodiment.

[0048] Furthermore, the noise reducer 3 of this modified example uses a triangular prism-shaped magnetic core 13 whose cross section orthogonal to the column axis direction forms an equilateral triangle, so any of the three sides may be used as the base to be fitted into the core holding portion 23b. Therefore, this noise reducer 3 is easy to assemble the magnetic core 13 to the core holding member 23, which also contributes to reducing costs.

[0049] Furthermore, because the noise reducer 3 of this modified example uses a triangular prism-shaped magnetic core 13, by reducing the cross-sectional area of ​​the magnetic core 13 in a cross section perpendicular to the column axis direction, the number of magnetic cores 13 increases if the diameter of the electric wire We or the electric wire bundle Web is the same, but the sum of the surface areas of the magnetic cores 13 increases. As a result, the noise reducer 3 can improve its heat dissipation performance.

[0050] The wire harness WH of this modification is provided with this noise reducer 3, and can obtain the same additional effects as those of this noise reducer 3.

[0051] As described above, the noise reducer 3 and wire harness WH of this modified example can obtain not only the same effects as the noise reducer 1 of the above-described embodiment, but also additional effects. Therefore, like the noise reducer 1 and wire harness WH of the embodiment, by applying this noise reducer 3 and wire harness WH to electric vehicles and charging systems, they will further contribute to the widespread use of electric vehicles and charging systems.

[0052] Furthermore, a charging system configured for rapid charging is more likely to generate noise than a charging system configured for normal charging. Therefore, the noise reducer 3 and wire harness WH of this modified example are particularly useful in a charging system for rapid charging and an electric vehicle that can be rapid charged using such a charging system. [Explanation of symbols]

[0053] 1,2,3 Noise reduction device 11, 12, 13 Magnetic core 21, 22, 23 Core holding member 21b, 22b, 23b Core holding part 21c,23c Communication part 31, 32, 33 Fixing member We Electric Wire Web wire bundle WH Wire Harness

Claims

1. a plurality of columnar magnetic cores extending in a column axis direction; a sheet-like or strip-like core holding member that holds a plurality of the magnetic cores and can be wound around an electric wire or an electric wire bundle obtained by bundling a plurality of electric wires at least once around the axis of the electric wire or the electric wire bundle; a fixing member that fixes the core holding member to the electric wire or the electric wire bundle while maintaining the wound shape of the core holding member wound around the electric wire or the electric wire bundle; Equipped with the core holding member holds the magnetic cores in the wound shape, arranged one by one at equal intervals around the axis of the electric wire or the electric wire bundle, for at least one turn, and has a core holding portion for each of the magnetic cores that holds each of the magnetic cores with the column axis direction aligned with the winding axis direction of the wound shape, The noise reducing tool is characterized in that the core holding portion is formed as a fitting portion into which the magnetic core is fitted.

2. The magnetic core is formed into a cylindrical shape, the core holding portion is formed as a cylindrical space into which the magnetic core can be fitted along the column axis, the core holding member has a communicating portion that communicates two adjacent core holding portions and brings the magnetic cores held by the two core holding portions into contact with each other in the wound shape, The noise reducer according to claim 1 , wherein the communication portion is provided for each pair of adjacent two of the core holding portions.

3. The magnetic core is formed into a trapezoidal columnar shape having a cross section orthogonal to the column axis direction, 2. The noise reducer according to claim 1, wherein the core holding portion is formed in a shape that fits the magnetic core at its lower bottom portion so that the upper bottom portion of the magnetic core is positioned on the electric wire side or the electric wire bundle side in the radial direction of the wound shape, and that brings the upper bottom portions of two adjacent magnetic cores into contact with each other in the wound shape for each combination.

4. The magnetic core is formed into a triangular prism shape having a cross section perpendicular to the column axis direction that is an equilateral triangle, the core holding portion fits the magnetic core at a bottom side thereof so that a top portion of the magnetic core is disposed on the electric wire side or the electric wire bundle side in a radial direction of the wound shape, the core holding member has a communicating portion that communicates two adjacent core holding portions and brings the base portions of the magnetic cores held by the two core holding portions into contact with each other in the wound shape, The noise reducer according to claim 1 , wherein the communication portion is provided for each pair of adjacent two of the core holding portions.

5. an electric wire or an electric wire bundle obtained by bundling a plurality of electric wires together; a noise reducer that reduces the emission of radiation noise from the electric wire or the electric wire bundle to the outside; Equipped with The noise reduction tool is a plurality of columnar magnetic cores extending in a column axis direction; a sheet-like or strip-like core holding member that holds a plurality of the magnetic cores and can be wound around the electric wire or the electric wire bundle at least once around the axis of the electric wire or the electric wire bundle; a fixing member that fixes the core holding member to the electric wire or the electric wire bundle while maintaining the wound shape of the core holding member wound around the electric wire or the electric wire bundle; Equipped with the core holding member holds the magnetic cores in the wound shape, arranged one by one at equal intervals around the axis of the electric wire or the electric wire bundle, for at least one turn, and has a core holding portion for each of the magnetic cores that holds each of the magnetic cores with the column axis direction aligned with the winding axis direction of the wound shape, The wire harness is characterized in that the core holding portion is a fitting portion into which the magnetic core is fitted.

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