JP6090225B2 - Bending part fixing structure of wire harness - Google Patents

Description

  The present invention relates to a structure for fixing a bent portion of a wire harness, and more specifically, when the bent portion of a wire harness routed in a vehicle is fixed to a fixing member such as a vehicle body panel, the wire harness is excessively bent and bending fatigue occurs. This is to prevent this from happening.

  A wire harness routed in a vehicle such as an automobile is fixed to a vehicle body panel or the like, which is a fixing material, in a state where the wire harness is bent at a bent portion of the routing route via a bracket or a clip. When the outer diameter of the wire harness bend fixing part is relatively small, a band clip or the like is used as a fixing tool, and when the wire harness outer diameter is relatively large, a bracket that is bolted to the vehicle body panel is fastened to the wire harness. It often sticks.

For example, in Japanese Patent Application Laid-Open No. 10-257631 relating to the prior application of the present applicant, a wire harness is covered with a rubber tube, a band clip is attached to the rubber tube, and the band clip is attached to a fixing material.
When fixing via a bracket, as shown in FIGS. 4 (A) to 4 (C), a metal bracket for fitting a bent portion of the wire harness 100 with a rubber tube 110 and fixing the body panel P with a bolt. 120 arc-shaped covering portions 121 are placed on the outer peripheral surface of the rubber tube 110, and the arc-shaped covering portions 121 are caulked and fixed to the rubber tube 110 in this state.

  As shown in FIG. 4, when the rubber tube 110 is interposed in the wire harness 100 and the bracket 120 is fixed by caulking, the load on the wire harness 100 can be reduced. However, a pulling force acts on the wire harnesses 100 on both sides of the bracket 120 that sandwich the arc-shaped covering portion 121, so that rapid bending is likely to occur. Thus, if it is bent rapidly, fatigue occurs in the bent portion, and there is a risk of disconnection.

  As a protective tube for suppressing rapid bending of a wire harness, Japanese Patent Application Laid-Open No. 2007-60781 discloses a protective tube shown in FIG. In the protective tube, the central portion of the bellows-like rubber tube 200 is a bending restricting portion 210, a cross-shaped rib 211 is provided in the bending restricting portion 210 in the length direction and the circumferential direction, and both side portions 213 and 214 where no rib is provided. It is harder to bend.

Japanese Patent Laid-Open No. 10-257631 JP 2007-60781 A

When the rubber tube 200 provided with the bending restriction portion 210 of Patent Document 2 is applied to a place fixed to the vehicle body panel with the bracket 120 shown in FIG. 4, the bracket is attached to the bending restriction portion 210 at the center of the rubber tube 200, Abrupt bending is likely to occur in the bellows-shaped side portions 213 and 214 that are not restricted from bending, and the same problem as in FIG. 4 occurs.
If the portions where the cross-shaped ribs 211 are provided are arranged on both sides of the bracket, the bent portion of the wire harness needs to be bent at a required angle, but the cross-shaped ribs 211 are bent at the lengthwise ribs. There is a problem that the wire harness is difficult to bend at a required bending angle.

  The present invention has been made in view of the above problems, and it is an object of the present invention to suppress rapid bending and prevent the occurrence of electric wire fatigue while maintaining bending performance so that it can be bent at a required angle.

In order to solve the above problems, the present invention is a wire harness bent portion fixing structure for bending a wire harness and attaching it to a fixing material using a bracket or a band clip.
A rubber part is attached to a bent portion of the wire harness, and the rubber part is provided with a bending suppressing part on at least both sides sandwiching a central cylinder part fitted by the bracket or the band clip,
The bending suppression portions on both sides include a plurality of ring portions spaced in the length direction, and an axial connection portion that connects adjacent ring portions at intervals in the circumferential direction,
The ring portion is sized to be fitted on the outer peripheral surface of the wire harness, and the thickness of the ring portion is larger than the thickness of the connecting portion, and the connecting portion is provided by continuously connecting the ring portion and the inner surface. The thickness of the part is reduced to increase flexibility and stretchability, and it can be bent until it shrinks at the connecting part and the adjacent ring parts come into contact with each other, while it is bent with the ring part in contact. Provided is a structure for fixing a bent portion of a wire harness that is impossible and prevents the occurrence of sudden bending.

  The central cylindrical portion of the rubber part has a cylindrical shape, the length of which corresponds to the width of the arc-shaped covering portion of the bracket or the width of the band of the band clip, and the ring portions are arranged at both ends in the length direction of the central cylindrical portion. Are preferably connected.

You may form the full length of the rubber component of this invention with the bending suppression part which consists of the said ring part and a connection part, without providing the cylindrical center cylinder part pinched | interposed into the bending suppression part of both sides.
That is, the ring part and the connecting part of the rubber part are sequentially provided with a bending suppressing part on both sides continuously at the central part, and the central cylindrical part of the rubber part is formed by the ring part and / or the connecting part. May be.

  As described above, when the rubber part is composed of a bending suppression part in which the ring part and the connection part are connected, the bending suppression part is bent at a portion where the arc-shaped covering part of the bracket or the band clip band is fitted and fixed. There is no problem because it is fixed without being fixed.

The length of each ring part of the rubber part is 2 mm to 4 mm, the wall thickness is 1 mm to 3 mm, and 4 to 8 ring parts are provided on both sides of the central cylinder part,
The said connection part shall connect the said adjacent ring part at intervals of 90 to 45 degree | times in the circumferential direction, and the length of each connection part is 2 mm-4 mm, and thickness is 1 mm-3 mm.

  The shorter the length of the ring part and the larger the length of the connecting part, the faster it can be bent. Conversely, the larger the length of the ring part and the shorter the length of the connecting part, the gentler the bending. . Therefore, by adjusting the length of the ring part and the length of the connecting part, the wire harness having the rubber part penetrated at an arbitrary angle along the bent part of the vehicle body panel along the wire harness is bent. Can do.

  The rubber component for suppressing bending according to the present invention is preferably molded from a relatively hard elastomer such as EPDM.

  In the present invention, a rubber part provided with a bending suppression part at least on both sides in the length direction is externally mounted on a wire harness, and a bracket or a band clip is used to interpose the rubber part to a bending part of a fixing member such as a vehicle body panel. Since it is fixed, it can be bent with an arbitrary curvature along with the bending of the vehicle body panel while suppressing rapid bending at the bending suppressing portion of the rubber part, and the bending performance can be improved. In addition, the wire harness is not fatigued by bending, and the durability of the wire harness can be improved.

It is drawing which shows 1st Embodiment of this invention. The rubber component used by 1st Embodiment is shown, (A) is a perspective view, (B) is the BB sectional view taken on the line (A), (C) is the CC sectional view taken on the line (A). A 2nd embodiment is shown, (A) is a front view of rubber parts, (B) is a sectional view of a band clip, and (C) is a drawing of the state of attachment to the body. (A)-(C) are drawings which show a prior art example. It is a front view which shows another prior art example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show a first embodiment.
As shown in FIG. 1, the wire harness 10 to be routed in the automobile is bent and routed so as to follow the bent portion 11k of the vehicle body panel 11 in the intermediate region in the length direction. In addition, a bending-suppressing rubber part 1 is externally attached to the wire harness 10 at the bent portion 11k, a metal bracket 13 is attached to the rubber part 1, and the bracket 13 is bolted to the vehicle body panel 11 serving as a fixing material. Are fixed.

The bending-suppressing rubber part 1 has a shape shown in FIG. 2 and is molded from an elastomer made of EPDM to form a relatively hard elastic material.
The rubber part 1 has a cylindrical shape and a total length of 60 mm to 100 mm. A cylindrical central cylindrical portion 2 is provided at the center of the rubber part 1 in the length direction, and bending suppressing portions 3 (3A, 3B) are continuously provided on both sides of the central cylindrical portion 2. The central cylindrical portion 2 and the bending suppressing portions 3A and 3B on both sides are provided in １ ／ increments as equivalent lengths.

  The thickness of the central cylindrical portion 2 is t1, and ring portions 5a and 5b having a thickness t2 are provided at both ends in the length direction. The wall thickness is t1 <t2, and the thin central tube portion 2 is sandwiched between the thick ring portions 5a and 5b. The length L1 of the central cylindrical portion 2 is equal to the length of the arc-shaped covering portion 13a of the bracket 13, so that the arc-shaped covering portion 13a can be positioned and held by being sandwiched by the thick ring portions 5a and 5b on both sides. I have to.

The bending suppressing portions 3 (3A, 3B) on both sides sandwiching the central cylindrical portion 2 are a plurality of ring portions 5 spaced in the length direction and connecting portions that connect adjacent ring portions 5 with a space in the axial direction. 6 and. A plurality of connecting portions 6 are provided at intervals in the circumferential direction. In this embodiment, six connecting portions 6 are provided at intervals of 60 degrees, and the ring portions 5 adjacent to each other in the length direction by the six connecting portions 6 are provided. Are connected. Moreover, the length direction dimension L3 of each ring part 5 shall be 2 mm-4 mm.
The ring portions 5a and 5b are ring portions that are continuous to the central cylindrical portion 2 of the bending suppression portions 3A and 3B on both sides.

  The inner diameters of all the ring parts 5 are set to contact with the outer peripheral surface of the wire harness 10 so as to be fitted outside, and the thickness of the ring part 5 is the same thickness t2 as the ring parts 5a and 5b sandwiching the central cylinder part 2. It ’s thick. In the present embodiment, five each of the bending suppression portions 3A and 3B on both sides are provided.

  The connecting portion 6 has a thin strip shape, and the thickness thereof is the same as the thickness t1 of the central tube portion 2 and is thin. Therefore, the thickness of the connecting portion 6 is approximately half of the thickness of the ring portion 5, and the inner surfaces of the ring portion 5 and the connecting portion 6 are connected as the same surface. The length L4 of each connecting portion 6 is 2 mm to 4 mm, and the length L3 of the ring portion 5 and the length L4 of the connecting portion 5 are L3: L4 = 1: 1 to 1: 2.

As described above, the thickness of the connecting portion 6 is made thin and long to make it easy to bend. On the other hand, since the ring part 5 connected by the connection part 6 is thick and has an annular shape, it cannot be bent in the length direction.
In a state where the rubber part 1 is bent and the connecting portion 6 is bent and contracted, and the ring portions 5 adjacent to each other in the length direction are in contact with each other, the bending suppressing portions 3A and 3B are not bent.

  As shown in FIG. 1, the bracket 13 to be attached to the rubber part 1 has a fixing part 13c provided with a bolt hole 13h via a bent part 13b on an arc-shaped covering part 13a covering the central cylindrical part 2 of the rubber part 1. The shape is equipped.

A procedure for fixing the wire harness 10 to the vehicle body panel 11 serving as a fixing material via the rubber part 1 and the bracket 13 will be described.
In the wire harness assembly factory, the rubber part 1 is externally fitted to the bent portion of the wire harness 10, and the center in the length direction of the central cylindrical portion 2 is positioned at the center of the bent portion in the wire harness wiring state. Next, the arc-shaped covering portion 13a of the bracket 13 is attached so as to be wound around the central cylindrical portion 2 of the rubber part 1 fitted around the wire harness 10, and then the arc-shaped covering portion 13a is crimped with a jig. As shown in FIG. 1, a bracket 13 is fixed to a rubber part 1 that is externally fitted to a wire harness.

When the wire harness 10 to which the rubber part 1 and the bracket 13 are attached is routed in an automobile, the bracket 13 fixed via the rubber part 1 is positioned along the bent portion 11k.
Bolts 14 are passed through bolt holes 13 h of the bracket 13, inserted into bolt holes provided in the vehicle body panel 11, screwed into nuts (not shown), and connected to the vehicle body panel 11 via the bracket 13 and the rubber part 1. 10 is fixed.

  Thus, the wire harness 1 fixed to the bent portion 11k of the vehicle body panel 11 via the bracket 13 and the rubber part 1 sandwiches the arc-shaped covering portion 13a of the bracket 13 along the bent portion 11k of the vehicle body panel 11. The wire harness 10 that penetrates the bending suppressing portions 3A and 3B on both sides of the rubber component 1 is bent. In this bending, the inner peripheral side connecting portion 6 in the bending suppressing portions 3A and 3B on both sides is bent and contracted until the adjacent ring portion 5 comes into contact, and the connecting portion 6 does not contract on the outer peripheral side, so that the rubber part 1 is bent. Then, the wire harness 10 penetrating through the rubber component 1 is bent.

When the adjacent ring portion 5 of the rubber part 1 abuts at the time of bending, it will not bend any further, so that the wire harness 10 is brought close to an arbitrary bend R along the bent portion 11k while preventing the wire harness 10 from being bent suddenly. Can do.
In other words, when the length L3 of each ring portion 5 is increased, the bending radius can be increased, while when the length L3 is decreased, the bending radius can be decreased. doing.

FIG. 3 shows a second embodiment.
In 2nd Embodiment, the shape of the rubber component 1 of 1st Embodiment is changed in the structure of the rubber component 1-2, the center cylinder part of the rubber component 1 of 1st Embodiment is eliminated, and the full length of the rubber component 1-2. Is constituted by a bending suppressing portion 3. That is, the ring portion 5 is sequentially connected by the connecting portion 6 over the entire length. 3B is used instead of the bracket 13 of the first embodiment in order to fix the rubber part 1-2 to the vehicle body panel 11 after the rubber part 1-2 is externally fitted to the bent portion of the wire harness 10. As shown in FIG. ing.

  The band clip 30 is made of a resin molded product. A through hole 32a is provided in a box-shaped main body 32 for extending the band 31, and a locking piece 32b is projected from the inner surface of the through hole 32a. The locking piece 32b is locked in the shaped locking groove 31a. A blade-like clip portion 33 projects from the outer surface of the main body 32, and the clip portion 33 projects a shaft portion 33b from the center of a dish portion 33a projecting from the outer surface of the main body 32. Engagement blades 33c are provided in a folded shape on both sides from the tip, and an engagement step 33d is provided at the tip of each engagement blade 33c.

The width of the band 31 is the same as the dimension between the adjacent ring parts 5, that is, the length of the connecting part 6, and the band 31 is wound around the connecting part 6 and then passed through the through hole 32 a of the main body 32. And fastened.
The clip portion 33 of the band clip 30 is inserted and locked into the clip hole 11c provided in the vehicle body panel 11, and the wire harness 10 is fixed to the bent portion 11k of the vehicle body panel 11 via the rubber part 1-2 and the band clip 30. doing.

  As described above, the wire harness 10 fixed to the bent portion 11k of the vehicle body panel 11 is bent by the bending suppressing portions 3 on both sides sandwiching the band clip 30, but the adjacent ring portions 5 are applied as in the first embodiment. Although the connection part 6 bends and shrinks to the contact position, it does not shrink any further, and it is possible to prevent the wire harness 10 from being suddenly bent.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Rubber part 2 Center cylinder part 3 (3A, 3B) Bending suppression part 5 Ring part 6 Connection part 10 Wire harness 11 Body panel 13 Bracket 30 Band clip

Claims (5)

Bending portion fixing structure of a wire harness that is attached to a fixing material via a bracket or a band clip by bending the wire harness,
A rubber part is attached to a bent portion of the wire harness, and the rubber part is provided with a bending suppressing part on at least both sides sandwiching a central cylinder part fitted by the bracket or the band clip,
The bending suppression portions on both sides are provided with a plurality of ring portions spaced in the length direction and a connection portion extending in the length direction connecting adjacent ring portions with a space in the circumferential direction.
The ring portion is sized to be fitted on the outer peripheral surface of the wire harness, and the thickness of the ring portion is larger than the thickness of the connecting portion, and the connecting portion is provided by continuously connecting the ring portion and the inner surface,
The connecting portion made thinner than the ring portion is flexible and stretchable, and can be bent until the connecting portion contracts and the adjacent ring portions come into contact with each other. Bending part fixing structure for wire harness that prevents bending and prevents sudden bending.   The central cylindrical portion of the rubber part has a cylindrical shape, the length of which corresponds to the width of the arc-shaped covering portion of the bracket or the width of the band of the band clip, and the ring portions are arranged at both ends in the length direction of the central cylindrical portion. The bending part fixing structure of the wire harness of Claim 1 which is connected.   Bending suppression portions on both sides in which the ring portion and the connecting portion of the rubber component are successively arranged are provided continuously in the central portion, and the central cylindrical portion of the rubber component is formed by the ring portion and / or the connecting portion. The bent portion fixing structure for a wire harness according to claim 1. The length of each ring part is 2 mm to 4 mm, the wall thickness is 1 mm to 3 mm, and 4 to 8 parts are provided on both sides of the central cylinder part,
The said connection part shall connect an adjacent ring part at intervals of 90 to 45 degree | times in the circumferential direction, and the length of each connection part is 2 mm-4 mm, and thickness is 1 mm-3 mm. The bending part fixing structure of the wire harness of any one of claim | item 3.   The bent structure fixing structure for a wire harness according to any one of claims 1 to 4, wherein the rubber part is formed of an elastomer.

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