WO2019198526A1

WO2019198526A1 - Noise absorption device

Info

Publication number: WO2019198526A1
Application number: PCT/JP2019/013567
Authority: WO
Inventors: 佳吾高橋
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2018-04-13
Filing date: 2019-03-28
Publication date: 2019-10-17
Also published as: JP2019186453A

Abstract

A noise absorption device 10 comprises: a rod-shaped part 31 having a rod shape onto which a cable 50 is directly or indirectly wound; and outer cylindrical parts 32 that cover the outer periphery of the rod-shaped part 31. The noise absorption device 10 comprises: a bobbin part 20 having a cable-wound section 21 onto which the cable 50 is wound, and a through-hole 22 formed to the inside of the cable-wound section; and a pair of ferrite parts 30 that cover the bobbin part 20. The pair of ferrite parts respectively include: the rod-shaped part 31 onto which the cable 50 is indirectly wound and which is inserted into the through-hole 22; and the outer cylindrical parts 32 that are formed integrally with the rod-shaped part 31 and cover the bobbin part 20.

Description

Noise absorber

The present invention relates to a noise absorber, and more particularly, to a noise absorber that reduces high-frequency noise emitted from a cable by using a ferrite core.

Conventionally, as this type of noise absorber, for example, the one described in Patent Document 1 is known. In the noise absorbing device described in Patent Document 1, a configuration in which a pair of ferrite cores combined so as to form a cable insertion path between each other is covered with a cover, that is, a so-called clamp core configuration is disclosed.

JP 2002-151333 A

By the way, in order to use the noise absorption effect of ferrite according to the increase in the number of turns (turns) of the cable, there are cases where it is desired to turn the cable a plurality of times in a pair of ferrite cores. However, in that case, in the noise absorbing device having the clamp core configuration, it cannot be said that the workability of attaching the cable to the noise absorbing device is good, for example, the cable bites between the pair of ferrite cores. Therefore, a technique that can simplify the work of turning the cable to the ferrite core a plurality of times has been desired. It is well known to increase the number of turns (number of turns) of the cable to obtain a noise absorption effect.

The technology disclosed in the present specification has been completed based on the above-described circumstances, and provides a noise absorbing device that can simplify the work of turning a cable to a ferrite core a plurality of times.

The noise absorbing device disclosed in this specification includes a rod-shaped ferrite core portion in which a cable can be directly or indirectly wound in a spiral shape, and an outer peripheral ferrite portion that covers the outer periphery of the ferrite core portion.

According to this configuration, the rod-shaped ferrite core portion on which the cable can be spirally wound directly or indirectly is provided. Therefore, in order to turn the cable around the ferrite core part a plurality of times, it is sufficient to simply wind the cable directly or indirectly around the rod-like ferrite core part in a spiral shape. Therefore, the operation | work which turns a cable to a ferrite core part in multiple times can be simplified. Moreover, since the ferrite core part is covered with the outer periphery ferrite part, the noise emitted from the cable can be more absorbed by the outer periphery ferrite part.

In the noise absorbing device, a cable winding portion around which a cable is wound, a bobbin portion having a through hole formed inside the cable winding portion, and a pair of ferrite portions covering the bobbin portion. The pair of ferrite portions corresponds to the ferrite core portion around which the cable is indirectly wound, corresponds to the rod-shaped portion inserted into the through hole, and the outer peripheral ferrite portion, and is integrally formed with the rod-shaped portion. And an outer cylinder part covering the bobbin part.

According to this configuration, the bobbin portion for indirectly winding the cable around the ferrite core portion is provided. That is, the cable can be wound around the bobbin portion in advance. This facilitates the work of turning the cable a plurality of times around the ferrite core part, and also enables the winding to be automated. Further, it is possible to prevent problems due to breakage such as bending, chipping, cracking, and scratching of the ferrite core portion due to cable winding work.

Furthermore, since the rod-shaped portion of the ferrite portion and the outer tube portion are integrally formed, the noise emitted from the cable is more reduced by the ferrite portion than when the rod-shaped portion and the outer tube portion are not integrally formed. Can be absorbed.

In the noise absorbing device, each of the pair of ferrite parts includes a slit formed in the outer cylinder part along the axial direction of the outer cylinder part and having a slit width larger than the diameter of the cable. Also good.

According to this configuration, the pair of ferrite cores can be attached to the bobbin portion around which the cable is wound while the both ends of the cable are pulled out by the slit. At that time, the biting of the cable by the pair of ferrite cores can also be suppressed.

The noise absorber further includes a pair of cylindrical synthetic resin cases covering the pair of ferrite portions, and the pair of synthetic resin cases respectively press the pair of ferrite portions in the axial direction. You may make it include a spring part.

According to this configuration, the paired ferrite portions can be protected by the synthetic resin case. Further, each ferrite portion is also pressed in the axial direction by the spring portion of the resin case. Thereby, the contact between the pair of ferrite portions can be ensured and the contact pressure can be adjusted.

According to the noise absorbing device disclosed in this specification, it is possible to simplify the work of turning the cable to the ferrite core a plurality of times.

The disassembled perspective view which shows the noise absorber of one Embodiment Perspective view showing noise absorber Sectional view along line AA in FIG. Perspective view of bobbin Perspective view of ferrite part

<Embodiment>
An embodiment will be described with reference to FIGS. In addition, let the direction shown by arrow X in FIG. 1 etc. be an axial direction of each part. At this time, the direction of the arrow X1 is the left direction, and the direction of the arrow X2 is the right direction. Moreover, about several identical members, a code | symbol may be attached | subjected to one member and a code | symbol may be abbreviate | omitted about another member.

The noise absorbing device 10 according to the present embodiment is used for a cable 50 of a vehicle wire harness, for example.

1. Configuration of Noise Absorbing Device As shown in FIG. 1, the noise absorbing device 10 includes a bobbin portion 20, a pair of ferrite portions 30, and a pair of synthetic resin cases (40A, 40B). In addition, when not distinguishing a pair of synthetic resin cases (40A, 40B), they are referred to as a synthetic resin case 40.

As shown in FIGS. 1 and 4, the bobbin portion 20 includes a cable winding portion 21 around which the cable 50 is wound, a through hole 22 (see FIG. 4) formed in the cable winding portion 21, and a cable winding portion. It includes flanges 23 formed at both ends of the attaching portion 21.

The pair of ferrite portions 30 are composed of the ferrite portions 30 having the same configuration, and cover the bobbin portion 20 by being united in the axial direction (the direction of arrow X in FIG. 1) when attached to the bobbin portion 20.

Each ferrite part 30 includes a rod-like part 31 and an outer cylinder part 32 as shown in FIG. The rod-like portion 31 has a rod-like shape with a circular cross section, and is inserted into the through hole 22 of the bobbin portion 20 when the ferrite portion 30 is attached to the bobbin portion 20. The rod-shaped part 31 is an example of a ferrite core part around which the cable 50 is indirectly wound. Note that the ferrite core portion is not limited to the rod-shaped portion 31.

The outer cylinder part 32 is integrally formed with the rod-like part 31 and covers the bobbin part 20. The outer cylinder part 32 is an example of the outer periphery ferrite part which covers the outer periphery of a ferrite core part. In addition, the outer cylinder part 32 does not need to be integrally formed with the rod-shaped part 31. Further, the outer peripheral ferrite portion is not limited to the outer cylindrical portion 32.

As shown in FIGS. 1 and 5, the outer cylinder portion 32 is formed along the axial direction (the arrow X direction in FIG. 1) and includes a slit 33 having a slit width larger than the diameter of the cable 50. Each ferrite part 30 can be attached to the bobbin part 20 around which the cable 50 is wound while the cable 50 is pulled out by the slit 33. At that time, 50 biting of the cable by the ferrite portion 30 is also suppressed.

Further, a locking opening 34 for locking a locking portion 43 of a synthetic resin case 40 described later is formed in the outer cylindrical portion 32 of the ferrite portion 30. When the engaging portion 43 of the synthetic resin case 40 is engaged with the engaging opening 34 of the outer cylinder portion 32, the position of each ferrite portion 30 is fixed.

Each of the pair of synthetic resin cases (40A, 40B) has a cylindrical shape similar to that of the ferrite portion 30, and is joined in the axial direction (the direction indicated by the arrow X in FIG. 1) to thereby pair the ferrite portion 30. Cover.

Each synthetic resin case (40A, 40B) includes a spring portion 44 that presses the ferrite portion 30 in the axial direction (the arrow X direction in FIG. 1) (see FIG. 3). The pair of ferrite portions 30 can be protected by the pair of synthetic resin cases (40A, 40B). Moreover, each ferrite part 30 is also pressed by the spring part 44 in the axial direction (arrow X direction of FIG. 1). Thereby, the contact between the pair of ferrite portions 30 can be secured and the contact pressure can be adjusted. The spring portion 44 is formed integrally with the synthetic resin case 40, for example. For example, the spring portion 44 may be formed of a separate member from the synthetic resin case 40.

Further, as described above, each synthetic resin case (40A, 40B) is formed with a locking portion 43 that is locked to the locking opening 34 of the outer cylindrical portion 32 of the ferrite portion 30. Further, each synthetic resin case 40 is formed with a connecting piece 42A and a connecting opening 42B, and each connecting piece 42A is connected to each pair of connecting openings 42B to join (unify) a pair of synthetic resin cases (40A, 40B). Is done by combining with

Further, in the case of each synthetic resin case (40A, 40B), similarly to the ferrite portion 30, the ferrite portion 30 is pulled out while the cable 50 is pulled out along the axial direction (the arrow X direction in FIG. 1). A slit 41 for covering is formed (see FIG. 2).

2. Assembling the Noise Absorbing Device When assembling the noise absorbing device 10 having the above-described configuration, first, the cable 50 is wound around the cable winding portion 21 of the bobbin portion 20 as shown in FIG. Here, the predetermined number of turns is, for example, the cable 50 such as the frequency of the signal applied to the cable 50, the frequency of noise generated in the cable 50, the allowable signal attenuation, and the required noise absorption. Depending on the use conditions, it is determined by experiments or the like as appropriate.

Next, while pulling out the cable 50 from the slit 33, the pair of ferrite portions 30 are attached to the bobbin portion 20 around which the cable 50 is wound. Next, a pair of synthetic resin cases (40 </ b> A, 40 </ b> B) are attached to the pair of ferrite portions 30 attached to the bobbin portion 20. At that time, the coupling piece 42A and the coupling opening 42B provided in each synthetic resin case 40 are coupled to each other, whereby the noise absorbing device 10 with the cable 50 as shown in FIG. 2 is assembled.

3. Effects of this Embodiment The noise absorbing device 10 of this embodiment includes a rod-shaped portion (ferrite core portion) 31 on which the cable 50 can be indirectly wound in a spiral shape via the cable winding portion 21 of the bobbin portion 20. Is provided. Therefore, in order to turn the cable 50 around the rod-shaped portion 31 a plurality of times, it is sufficient to simply wind the cable 50 indirectly around the cable winding portion 21 of the bobbin portion 20 in a spiral manner. Therefore, the operation | work which turns the cable 50 to the rod-shaped part 31 in multiple times can be simplified.

In addition, since the rod-shaped portion 31 is covered with the outer tube portion (outer peripheral ferrite portion) 32, noise emitted from the cable 50 can be more absorbed by the outer tube portion 32.

That is, the bobbin portion 20 for indirectly winding the cable 50 around the rod-shaped portion (ferrite core portion) 31 is provided. With this configuration, the cable 50 can be wound around the bobbin portion 20 in advance. Therefore, the work of turning the cable 50 around the rod-shaped portion 31 a plurality of times is facilitated, and the winding work can be automated. In addition, it is possible to prevent problems due to breakage, chipping, cracking, damage, etc. of the rod-shaped part (ferrite core part) 31 due to the cable winding work.

Furthermore, the rod-shaped part 31 and the outer cylinder part 32 of the ferrite part 30 are integrally formed. Therefore, compared with the case where the rod-shaped part 31 and the outer cylinder part 32 are not integrally formed, the noise emitted from the cable 50 can be more absorbed by the ferrite part 30.

Further, depending on the diameter of the rod-shaped part (ferrite core part) 31 of the ferrite part 30, the winding radius of the cable 50 can be significantly smaller than the winding radius in the case of the conventional clamp core. Thereby, the difference in cable length due to the difference in the number of turns can be reduced as compared with the case of the clamp core. This contributes to the uniformity of the product length when the noise absorbing device 10 is attached to the cable 50 when the cable length is constant.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiment described with reference to the above description and the drawings. For example, the following embodiments are also included in the technical scope.

(1) In the above embodiment, an example in which the bobbin portion 20 is provided and the cable 50 is wound around the cable winding portion 21 of the bobbin portion 20, that is, the cable 50 is indirectly spirally formed on the rod-shaped portion (ferrite core portion) 31. Although the example wound around is shown, it is not restricted to this. The cable 50 may be directly wound around the rod-shaped ferrite core portion in a spiral shape and may include an outer peripheral ferrite portion that covers the outer periphery of the ferrite core portion. Further, the ferrite core portion is not limited to the pair of individual rod-shaped portions 31, and the outer peripheral ferrite portion is not limited to the pair of individual outer cylinder portions 32.

Even in this case, a rod-shaped ferrite core portion around which the cable 50 is directly wound is provided. Therefore, the operation | work which turns a cable to a ferrite core part in multiple times can be simplified. Moreover, since the ferrite core part is covered with the outer periphery ferrite part, the noise emitted from the cable can be more absorbed by the outer periphery ferrite part.

(2) In the above-described embodiment, the example in which the slit 33 formed along the axial direction is provided in the outer tube portion 32 of the ferrite portion 30 is not necessarily limited thereto. For example, a drawer hole may be provided instead of the slit 33.

(3) In the above-described embodiment, an example in which the pair of synthetic resin cases 40 including the spring portion 44 is provided has been described, but the present invention is not limited thereto. For example, the spring portion 44 may be omitted, or the pair of synthetic resin cases 40 themselves may be omitted.

(4) In the above embodiment, the rod-shaped portion 31 of the ferrite portion 30 has an example of a rod-shaped cross section, but the present invention is not limited thereto. For example, the rod-shaped portion 31 may have a rod-like cross section or a hexagonal cross section. At that time, corresponding to the cross-sectional shape of the rod-shaped portion 31, the cross-sections of the cable winding portion 21, the outer cylinder portion 32, and the synthetic resin case 40 may also have a rectangular or hexagonal shape. That is, the cylindrical shape of the cable winding part 21, the outer cylinder part 32, and the synthetic resin case 40 is not limited to a cylindrical shape having a circular cross section.

10: Noise absorber 20: Bobbin portion 21: Cable winding portion 22: Through hole 30: Ferrite portion (a pair of ferrite portions)
31: Rod-shaped part (ferrite core part)
32: Outer tube (outer periphery ferrite)
33: Slit 40A: Synthetic resin case (one of a pair of synthetic resin cases)
40B: Synthetic resin case (the other of the pair of synthetic resin cases)
44: Spring part 50: Cable

Claims

A rod-shaped ferrite core that can be wound directly or indirectly in a spiral; and
A noise absorbing device comprising: an outer periphery ferrite portion that covers an outer periphery of the ferrite core portion.
The noise absorber according to claim 1,
A bobbin portion having a cable winding portion around which a cable is wound, and a through-hole formed inside the cable winding portion;
A pair of ferrite parts covering the bobbin part,
Each of the pair of ferrite portions is
Corresponding to the ferrite core part around which the cable is indirectly wound, a rod-like part inserted into the through hole,
A noise absorbing device corresponding to the outer peripheral ferrite part and including an outer cylinder part integrally formed with the rod-like part and covering the bobbin part.
The noise absorber according to claim 2,
Each of the pair of ferrite portions includes a slit formed in the outer tube portion so as to be along the axial direction of the outer tube portion and having a slit width larger than the diameter of the cable.
The noise absorber according to claim 2 or 3,
A pair of cylindrical synthetic resin cases covering the pair of ferrite parts,
Each of the pair of synthetic resin cases includes a spring portion that presses the pair of ferrite portions in the axial direction.