JP2012134028A - Wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which prevents an electric wire wound around a ferrite core from contacting with other members in a wiring harness.SOLUTION: A noise reduction device 20 attached to a wiring harness 1 has a substantially cylindrical ferrite core 21, a substantially cylindrical case 22 covering an outer peripheral surface of the ferrite core 21, and a lid 23 covering an outer peripheral surface of the case 22. An electric wire 11 led out from a cable 10 is wound around the noise reduction device 20 passing through a space between the case 22 and the lid 23 and the inner side of the ferrite core 21. Thus, the lid 23 disposed on the outer peripheral side relative to the electric wire 11 serves as a protector of the electric wire 11 and prevents the electric wire 11 from contacting with other components, thereby preventing the damage of the electric wire 11.

Description

  The present invention relates to a wire harness mounted on an automobile.

  There is known a wire harness that electrically connects electronic components and electrical components arranged in each part of an automobile. In a wire harness, electromagnetic current may be radiated from the electric wire due to noise current flowing through the electric wire, or noise current may flow through the electric wire due to external electromagnetic waves. In order to reduce these phenomena, a ferrite core is attached in the middle of the electric wire.

  The ferrite core generally has a cylindrical outer shape and is accommodated in a resin case that covers the outer peripheral surface thereof. The structure of a conventional ferrite core and case is disclosed in Patent Document 1, for example.

JP 2007-335769 A

  When such a ferrite core is used, an electric wire may be wound around the ferrite core and the case in order to enhance the effect of reducing noise. However, in the conventional ferrite core and case structure, when the electric wire is wound, the electric wire is exposed to the outside of the case. Various members are arranged close to each other in a wiring area in the automobile. When the electric wire exposed outside the case comes into contact with these members, the electric wire may be damaged.

  In addition, when fixing the ferrite core to the vehicle body using a clip band, the band is wound around the case and fixed. At that time, if the band comes into contact with the electric wire exposed outside the case, the electric wire may be damaged. Conventionally, the electric wire is protected by winding a buffering insulating tape around the outer side of the electric wire and winding a band around the outer side. However, in such a method, the number of manufacturing steps increases due to the work of winding the insulating tape. In addition, the manufacturing cost increases due to the material cost of the insulating tape.

  Then, an object of this invention is to provide the structure which can suppress the contact with the electric wire wound around the ferrite core and another member in a wire harness.

  1st invention of this application is a wire harness mounted in a motor vehicle, Comprising: The cable comprised by a some electric wire, The noise reduction apparatus attached to the electric wire pulled out from the said cable, The said noise reduction apparatus Has a substantially cylindrical ferrite core, a substantially cylindrical case that covers the outer peripheral surface of the ferrite core, and a lid portion that at least partially covers the outer peripheral surface of the case. And the lid portion and the inside of the ferrite core are wound around the noise reduction device.

  2nd invention of this application is a wire harness of 1st invention, Comprising: The said cover part has covered the whole of the axial direction of the said case.

  3rd invention of this application is a wire harness of 1st invention or 2nd invention, Comprising: The said case and the said cover part are the single resin members integrally molded.

  A fourth invention of the present application is the wire harness according to any one of the first invention to the third invention, wherein a protrusion is provided on one of the outer peripheral surface of the case and the inner peripheral surface of the lid portion. And the other of the outer peripheral surface of the case and the inner peripheral surface of the lid.

  5th invention of this application is a wire harness of 4th invention, Comprising: The said processus | protrusion is provided in a pair in the circumferential direction on the outer peripheral surface of the said case, and the said electric wire passes between a pair of said processus | protrusions. And wound around the noise reduction device.

  A sixth invention of the present application is any one of the wire harnesses of the first invention to the fifth invention, further comprising a clip band having a band wound around the ferrite core and a clip fixed to the vehicle body, The back surface of the clip band is in contact with the outer peripheral surface of the lid.

  7th invention of this application is a wire harness of 6th invention, Comprising: The groove-shaped recessed part extended in the circumferential direction is provided in the said case and the said cover part, The said clip band is arrange | positioned along the said recessed part Yes.

  An eighth invention of the present application is the wire harness according to any one of the first invention to the fifth invention, wherein the lid portion is a clip fixed to the vehicle body or a mounting hole for attaching a clip fixed to the vehicle body have.

  According to the first to eighth aspects of the present invention, the contact between the electric wire wound around the noise reduction device and another member can be suppressed. Therefore, damage to the electric wire can be suppressed.

  In particular, according to the second invention of the present application, contact between the electric wire and another member can be further suppressed.

  In particular, according to the third invention of the present application, the manufacturing process of the ferrite core can be shortened by integrally molding the case and the lid.

  In particular, according to the fourth invention of the present application, a gap can be secured between the outer peripheral surface of the case and the inner peripheral surface of the lid. For this reason, the damage of the electric wire by a case and a cover part can be suppressed.

  In particular, according to the fifth invention of the present application, it is possible to prevent the circumferential displacement of the electric wire by using a pair of protrusions.

  In particular, according to the sixth invention of the present application, it is possible to suppress the damage of the electric wire due to the clip band.

  In particular, according to the seventh invention of the present application, the axial displacement of the clip band can be suppressed.

  In particular, according to the eighth invention of the present application, there is no need to wind a clip band around the ferrite core. Therefore, damage to the electric wire due to the band can be prevented.

It is a fragmentary perspective view of a wire harness. It is an expansion perspective view of a noise reduction device. It is a perspective view of the noise reduction apparatus which concerns on a modification. It is an expansion | deployment perspective view of the noise reduction apparatus which concerns on a modification. It is a perspective view of the noise reduction apparatus which concerns on a modification. It is a perspective view of the noise reduction apparatus which concerns on a modification. It is a perspective view of the noise reduction apparatus which concerns on a modification.

  Embodiments of the present invention will be described below with reference to the drawings.

<1. Wire harness according to one embodiment>
FIG. 1 is a partial perspective view of a wire harness 1 according to an embodiment of the present invention. The wire harness 1 is mounted on an automobile and is used to electrically connect electronic components and electrical components arranged in each part of the automobile. As shown in FIG. 1, the wire harness 1 of this embodiment includes a cable 10, a noise reduction device 20, and a clip band 30.

  The cable 10 is a bundle of a plurality of electric wires 11 that perform power supply and signal communication. The cable 10 has a branch structure according to the wiring design in the automobile. The cable 10 may be accommodated in an exterior member (not shown) such as a tube or a protector for protection from peripheral members. In addition, the cable 10 may be comprised only with the some electric wire, and may contain an optical fiber.

  The noise reduction device 20 is a device for reducing electrical noise of the electric wires 11 drawn from the cable 10. The noise reduction device 20 includes a substantially cylindrical ferrite core 21, a case 22 that houses the ferrite core 21, and a lid portion 23 that covers the upper portion of the case 22. The electric wire 11 to be subject to noise reduction is wound around the ferrite core 21 and the case 22. Thereby, radiation of electromagnetic waves from the electric wire 11 and generation of electrical noise in the electric wire 11 are suppressed. Further, the electric wire 11 is connected to a predetermined electronic device (not shown) on the distal side of the noise reduction device 20.

  The clip band 30 is a member for fixing the noise reduction device 20 to the vehicle body. The clip band 30 includes a band-shaped band 31 and a clip 32 protruding outward from the band 31. The band 31 is wound around the noise reduction device 20. The clip 32 is fixed to the vehicle body by engaging a pair of claw portions 321 provided on the left and right sides with attachment holes provided on the vehicle body side.

  Next, the detailed structure of the noise reduction device 20 described above will be described. FIG. 2 is a developed perspective view of the noise reduction device 20. In the following, FIG. 2 will be referred to as appropriate together with FIG.

  The ferrite core 21 of the noise reduction device 20 includes a first semi-cylindrical (saddle-shaped) first magnetic member 211 and a second semi-cylindrical second magnetic member 212. When the end surface of the first magnetic member 211 and the end surface of the second magnetic member 212 are brought into contact with each other, the ferrite core 21 having a substantially cylindrical outer shape as a whole is obtained. Both the first magnetic member 211 and the second magnetic member 212 are made of ferrite, which is a ferromagnetic material.

  The case 22 includes a substantially semi-cylindrical first case portion 221 that covers the outer peripheral surface of the first magnetic member 211 and a substantially semi-cylindrical second case portion 222 that covers the outer peripheral surface of the second magnetic member 212. is doing. The first case part 221 and the second case part 222 are integrally molded together with a lid part 23 described later to constitute a single resin member 2.

  The first case part 221 and the second case part 222 are connected via the first thin-walled hinge 24. For this reason, the 1st case part 221 and the 2nd case part 222 can be rotated centering on the 1st thin hinge 24. FIG. A first claw portion 223 is provided on the end of the second case portion 222 opposite to the first thin hinge 24. When the first case portion 221 and the second case portion 222 are closed, the first claw portion 223 is locked in a first locking hole (not shown) provided on the first case portion 221 side. Thereby, the substantially cylindrical case 22 is formed, and the ferrite core 21 is held inside the case 22.

  The lid portion 23 is a substantially semi-cylindrical member that covers the outer peripheral surface of the first magnetic member 211. The lid portion 23 is connected to the first case portion 221 and the second thin hinge 25 described above. For this reason, the 1st case part 221 and the cover part 23 can be rotated centering | focusing on the 2nd thin hinge 25. FIG. In addition, a pair of second claw portions 231 is provided on the end of the lid portion 23 opposite to the second thin hinge 25. When the lid portion 23 is closed, the pair of second claw portions 231 are respectively locked in the pair of second locking holes 224 provided on the case 22 side. Thereby, the cover part 23 is fixed in the state which covers the outer peripheral surface of the 1st case part 221. As shown in FIG.

  The electric wire 11 is wound around the first magnetic member 211 and the first case portion 221. That is, the electric wire 11 is wound around the noise reduction device 20 between the outer peripheral surface of the first case portion 221 and the inner peripheral surface of the lid portion 23 and through the inside of the ferrite core 21. For this reason, the cover part 23 arrange | positioned rather than the electric wire 11 plays the role which protects the electric wire 11, and suppresses the contact with the electric wire 11 and another member. Thereby, the damage of the electric wire 11 is suppressed.

  In particular, in this embodiment, the clip band 30 is wound around the noise reduction device 20, but the back surface of the clip band 30 is in contact with the outer peripheral surface of the lid portion 23 and the outer peripheral surface of the second case portion 222. Do not touch. For this reason, even if the clip band 30 is tightened strongly, the corners of the band 31 bite into the electric wire 11 and the electric wire 11 is not damaged. Therefore, the clip band 30 can be mounted while preventing the electric wire 11 from being damaged.

  Further, since the lid portion 23 is provided, there is no need to wrap a tape for protecting the electric wire 11 around the noise reduction device 20. For this reason, in the manufacturing process of the wire harness 1, the operation | work which winds a tape around the noise reduction apparatus 20 can be abbreviate | omitted. In addition, the part cost for the tape can be reduced.

<2. Modification>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  In the above embodiment, the case 22 and the lid portion 23 are integrally molded. However, the case 22 and the lid part 23 may be separate members molded individually. However, it is preferable that the case 22 and the lid portion 23 are integrally molded as in the above-described embodiment, because the manufacturing process of the noise reduction device 20 can be shortened and the manufacturing cost for resin molding can be suppressed.

  Further, the shape of the lid portion 23 may be a shape other than a semi-cylindrical shape. For example, the cover part 23 may be formed in the box shape which has a U-shaped cross section.

  FIG. 3 is a perspective view of a noise reduction device 20A according to another modification. In the example of FIG. 3, the lid portion 23A covers only a part of the first case portion 221A in the axial direction (the direction along the central axis of the ferrite core and the case). Even if it is such a form, if a clip band is wound around the outer peripheral side of the cover part 23A, a contact with a clip band and the electric wire 11A can be prevented.

  However, if the entire axial direction of the first case portion 221 is covered with the lid portion 23 as in the above-described embodiment, not only the clip band 30 but also other devices arranged in the vicinity of the noise reduction device 20 are used. Contact between the member and the electric wire 11A can also be prevented. Therefore, the electric wire 11A can be protected from more damage factors.

  FIG. 4 is a developed perspective view of a noise reduction device 20B according to another modification. In the example of FIG. 4, a pair of protrusions 225B extending in the axial direction are provided on the outer peripheral surface of the first case portion 221B. The pair of protrusions 225B are arranged side by side in the circumferential direction. And the electric wire 11B passes between these protrusions 225B, and is wound around the first case portion 221B and the first magnetic member 211B. In this way, the electric wire 11B can be wound along the pair of protrusions 225B. Moreover, it can prevent that the electric wire 11B wound is displaced in the circumferential direction.

  Further, when the lid portion 23B is closed, the pair of protrusions 225B abut on the inner peripheral surface of the lid portion 23B. Thereby, a clearance gap is securable between the outer peripheral surface of the 1st case part 221B, and the inner peripheral surface of the cover part 23B. And the electric wire 11B can be arrange | positioned in the said clearance gap. Therefore, it is prevented that the 1st case part 221B and the cover part 23B press the electric wire 11B. As a result, damage to the electric wire 11B is more reliably prevented.

  That is, in the example of FIG. 4, the pair of protrusions 225B serves both as a guide for guiding the electric wire 11B and as a spacer for securing a gap between the first case portion 221B and the lid portion 23B. Plays. If only the function as a spacer is sufficient, a similar protrusion may be provided on the inner peripheral surface of the lid portion 23B. The shape of the protrusion 225B is not limited to the longitudinal shape as shown in FIG. 4, but may be a dot shape. Further, the number of the protrusions 225B may be one, or may be three or more.

  FIG. 5 is a perspective view of a noise reduction device 20C according to another modification. In the example of FIG. 5, a groove-like recess 26 </ b> C extending in the circumferential direction is provided on the outer peripheral surface of the lid 23 </ b> C. The width (length in the axial direction) of the recess 26 </ b> C is set to be equal to or slightly larger than the width of the clip band. If it does in this way, a clip band can be wound, making it fit in crevice 26C. Therefore, the axial displacement of the clip band can be suppressed. In addition, the same recessed part may be provided also in the outer peripheral surface of the 2nd case part 222C.

  FIG. 6 is a perspective view of a noise reduction device 20D according to another modification. In the example of FIG. 6, an attachment hole 232 </ b> D extending in the axial direction is provided in the lid portion 23 </ b> D. Then, the leg portion 321D of the separate clip 32D is inserted into the mounting hole 232D and fixed. In this way, there is no need to wrap the clip band around the noise reduction device 20D. Therefore, the electric wire 11D is not damaged by the band.

  FIG. 7 is a perspective view of a noise reduction device 20E according to another modification. In the example of FIG. 7, a clip 32E is integrally formed on the outer peripheral surface of the lid portion 23E. Also in this example, it is not necessary to wrap the clip band around the noise reduction device 20E. Therefore, the electric wire 11E is not damaged by the band.

  Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

DESCRIPTION OF SYMBOLS 1 Wire harness 2 Resin member 10 Cable 11, 11A, 11B, 11D, 11E Electric wire 20, 20A, 20B, 20C, 20D, 20E Noise reduction device 21 Ferrite core 22 Case 23, 23A, 23B, 23C, 23D, 23E Cover part 26C Concave portion 30 Clip band 31 Band 32, 32D, 32E Clip 211 First magnetic member 212 Second magnetic member 221, 221A, 221B First case portion 222, 222C Second case portion 225B Projection 232D Mounting hole

Claims (8)

A wire harness mounted on an automobile,
A cable composed of a plurality of electric wires;
A noise reduction device attached to an electric wire drawn from the cable;
With
The noise reduction device is:
A substantially cylindrical ferrite core;
A substantially cylindrical case covering the outer peripheral surface of the ferrite core;
A lid that at least partially covers the outer peripheral surface of the case;
Have
The wire harness is wound around the noise reduction device between the case and the lid and through the inside of the ferrite core. The wire harness according to claim 1,
The said cover part is a wire harness which has covered the whole axial direction of the said case. The wire harness according to claim 1 or 2,
The said case and the said cover part are wire harnesses which are the single resin members integrally molded. A wire harness according to any one of claims 1 to 3, wherein
A protrusion is provided on one of the outer peripheral surface of the case and the inner peripheral surface of the lid,
The said protrusion is a wire harness which is in contact with the other of the outer peripheral surface of the said case and the inner peripheral surface of the said cover part. The wire harness according to claim 4,
The protrusions are provided on the outer peripheral surface of the case in a pair along the circumferential direction,
The wire is a wire harness that is wound around the noise reduction device through a pair of protrusions. A wire harness according to any one of claims 1 to 5, wherein
A clip band having a band wound around the ferrite core and a clip fixed to the vehicle body;
The wire harness with which the back surface of the said clip band is contacting the outer peripheral surface of the said cover part. The wire harness according to claim 6,
The case and the lid are provided with groove-shaped recesses extending in the circumferential direction,
The said clip band is a wire harness arrange | positioned along the said recessed part. A wire harness according to any one of claims 1 to 5, wherein
The said cover part is a wire harness which has the attachment hole which attaches the clip fixed to a vehicle body, or the clip fixed to a vehicle body.

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