JP5417923B2 - Wire harness - Google Patents

Description

  The present invention relates to a wire harness provided with a protective material.

  Conventionally, as a measure for protecting a wire bundle constituting a wire harness disposed in an automobile or the like, a device using a corrugated tube as a protective material is known (see Patent Document 1). Specifically, after the tape is wound around the wire bundle (bottom winding) and bundled, the wire bundle is accommodated in the corrugated tube while opening the slit cut along the axial direction. In order to prevent this, a tape is wound around the outer periphery of the corrugated tube (upper winding).

JP 2000-353432 A

When a corrugated tube is used as a protective material, it is necessary to work to wind the tape around the wire bundle, to house the wire bundle in the corrugated tube, or to work up the tape to prevent the corrugated tube from opening. Because of the large number of work processes and the number of parts, it was a factor of high cost.
In addition, when a corrugated tube is used, the accommodation rate of the wire bundle in the corrugated tube is suppressed to, for example, about 80% in order to suppress opening of the harness when the harness is bent. This has hindered space saving.
The present invention has been completed based on the above circumstances, and its purpose is to provide a protective material capable of reducing costs and saving space while performing the protection function of the wire bundle. Is providing a wire harness.

The wire harness of the present invention has a protective tape in which an adhesive layer is formed on the back surface of a laminated base material in which a cloth material and a sheet material made of woven fabric or knitted fabric are bonded together only through a rubber-based adhesive. It is characterized by being wound around a wire bundle.

The protective tape has a three-layer structure in which the base material is bonded to a cloth material made of woven or knitted fabric and another sheet material via a rubber-based adhesive, and receives a load from the outside. In this case, it can be said that it is difficult to wear due to stress relaxation mainly by the rubber-based pressure-sensitive adhesive which is an intermediate layer, that is, it is excellent in wear resistance. In addition, since at least the front or back layer of the substrate is made of a cloth material made of woven or knitted fabric, it can be easily cut by hand, that is, has excellent hand cutting properties.
Since such a protective tape having excellent wear resistance is wound, the function of protecting the wire bundle is sufficiently fulfilled.

In addition, the protective tape can be attached simply by wrapping the protective tape around the outer circumference of the wire bundle. Also, since the protective tape is excellent in hand cutting, it can be easily cut by hand. Therefore, the protective tape can be efficiently attached. In other words, the mounting time of the protective material can be shortened, and the number of parts can be reduced, so that the manufacturing cost can be greatly reduced.
Since the structure is such that only a tape that is swayed is wound, the increase in the diameter of the wire harness can be kept to a minimum, contributing to space saving, and at the same time reducing the weight.

  Further, the protective tape has excellent sound deadening properties, and generation of noise when the wire harness hits or rubs on surrounding equipment or the like due to vibration or the like is suppressed. Further, the protective tape is excellent in flexibility, and even when the outer periphery of the wire bundle has irregularities or the wire bundle is bent, the protective tape can be tightly wound around the outer peripheral surface of the wire bundle.

The following configuration may also be used.
(1) A release film is disposed on the surface of the substrate in the protective tape.
When the protective tape is a roll, depending on the type of material of the surface layer of the base material, there is a concern that the adhesive remains on the back surface when the protective tape is unwound. On the other hand, since the release film is arranged on the surface of the base material, the above-mentioned adhesive remaining is prevented.

(2) The protective tape is spirally wound around the outer periphery of the wire bundle while wrapping side edges.
(3) The protective tape is wound in a cylindrical shape while wrapping both side edges with respect to the outer periphery of the wire bundle.
(4) The protective tape is wound around the outer periphery of the electric wire bundle in a cylindrical shape with both side edges bonded together.

  ADVANTAGE OF THE INVENTION According to this invention, the wire harness with a protective material which can aim at cost reduction and space saving can be obtained after the protection function of an electric wire bundle was fulfilled.

Sectional drawing of the protective tape which concerns on Embodiment 1 of this invention Perspective view of scroll of protective tape Side view showing the form of wrapping the protective tape around the wire bundle Schematic diagram of wear resistance tester Table showing the test results Schematic diagram of a muffler testing device related to hammering sound Graph showing the test results Schematic diagram of a muffler testing device for rubbing noise Graph showing the test results The perspective view which shows the form which winds the protective tape which concerns on Embodiment 2 around an electric wire bundle The perspective view which shows the form which winds the protection tape which concerns on Embodiment 3 around an electric wire bundle

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The first embodiment generally has a structure in which a protective tape 20 that is a protective material is wound around a wire bundle 10 that constitutes a wire harness.
As shown in FIG. 3, the electric wire bundle 10 is a bundle of a plurality of covered electric wires 11 or shielded electric wires.

As shown in FIG. 1, the protective tape 20 further includes a base material 21, an adhesive layer 25 formed on the back surface side in contact with the outer peripheral surface of the wire bundle 10 in the base material 21, and a surface side of the base material 21. The formed release film 26 is formed.
The base material 21 further has a three-layer laminated structure in which a woven fabric 22 and a non-woven fabric 23 are bonded together via a rubber-based adhesive 24. Here, the “woven fabric” is a fabric formed by crossing warp and weft vertically. “Nonwoven fabric” is a fabric formed by entanglement or bonding of a lump of sheet-like fibers.
Examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 25 include acrylic pressure-sensitive adhesives and rubber-based pressure-sensitive adhesives.
The release film 26 is exemplified by a polyethylene film.

The thickness of each layer is such that the thickness t1 of the outermost release film 26 is less than 0.05 mm, the thickness t2 of the woven fabric 22 on the substrate 21 is less than 0.2 mm, and a rubber adhesive that is an intermediate layer The thickness t3 of 24 is set to 0.05 to 0.1 mm, the thickness t4 of the nonwoven fabric 23 on the back side is set to less than 0.2 mm, and the thickness t5 of the adhesive layer 25 on the back side is set to 0.05 to 1.0 mm. In addition, the total thickness is set to 1.0 mm or less. In this embodiment, the total thickness is 0.5 mm.
Further, the width of the protective tape 20 is set to 100 mm or less, and for example, 25 mm is selected.

The protective tape 20 having such a width (25 mm) and thickness (0.5 mm) is prepared as a so-called roll 32 wound around a paper core tube 31, as shown in FIG.
Here, when the surface layer of the base material 21 of the protective tape 20 is composed of the woven fabric 22 and the protective tape 20 is the roll 32 as described above with the woven fabric 22 exposed, the protective tape 20 There is a concern that the adhesive may remain on the back surface or the fibers of the woven fabric 22 may be pulled as the fabric is fed out. On the other hand, in this embodiment, since the release film 26 is arranged on the surface of the base material 21, when the protective tape 20 is unwound, the adhesive is reliably peeled from the back surface, and the fibers of the woven fabric 22. Is also prevented from being pulled.

And in protecting the electric wire bundle 10 which comprises some wire harnesses, the protective tape 20 is wound around the electric wire bundle 10 by manual work. In this embodiment, as shown in FIG. 3, the protective tape 20 is spirally wound around the outer periphery of the wire bundle 10 while wrapping the side edges while being fed out from the roll 30, and the adhesive layer 24 on the back surface is the wire. Bonded to the outer peripheral surface of the bundle 10. Examples of the form of the wrap include wrapping 1/4 of the full width (1/4 wrap) or wrapping half of the full width (half wrap).
When the protective tape 20 is wound over a predetermined region of the wire bundle 10, the protective tape 20 needs to be cut. Here, since the surface layer of the base material 21 of the protective tape 20 is composed of the woven fabric 22, it can be easily cut by hand, that is, has excellent hand cutting properties.

The evaluation as to whether or not the protective tape 20 wound as described above is effective as a protective material for the wire bundle 10 is to substantially evaluate the wear resistance of the protective tape 20 itself. Here, regarding “wear”, when the protective tape 20 receives a load from the outside, if the inner wire bundle 10 is exposed to the outside, the protective tape 20 of the present embodiment is resistant to damage. It can be said that it is excellent in abrasion.
This is because the base material 21 of the protective tape 20 has a three-layer structure in which a woven fabric 22 and a non-woven fabric 23 are bonded together via a relatively thick rubber-based adhesive 24, and a load is applied from the outside. When it is received, it is considered that it is difficult to wear due to stress relaxation mainly by the rubber-based pressure-sensitive adhesive 24 which is an intermediate layer.

Here, when the test regarding the abrasion resistance of the protective tape 20 according to the present embodiment was performed, the following results were obtained.
In the test, as shown in FIG. 4, a wear resistance tester (for low-voltage electric wires for automobiles) defined in JIS was used. In this testing machine, a sample 100 is wound around the outer periphery of a conductor 101 made of an aluminum tube and sandwiched between a pair of upper and lower metal sandwiching bodies 102, 103, and between the lower sandwiching body 103 and the sample, An endless wear tape 104 (compliant with JIS R6251) is disposed so as to be able to run. The wear tape 104 is provided with a conductive portion 105 at a predetermined interval (150 mm), and the lower sandwiching body 103 and the conductor 101 are connected by a conductive wire 106, and a conduction measuring portion is provided in the middle thereof. 107 is provided.

Then, with the load K (45 gf) applied to the upper sandwiching body 102, the wear tape 104 is run at a predetermined speed (1500 mm / min). When the sample 100 gradually wears as the wear tape 104 travels and eventually the hole is opened, one conductive portion 105 of the wear tape 104 contacts the conductor 101 through the hole, and a current flows through the conductive wire 106, which is conducted. The wear tape 104 stops when it is detected by the measurement unit 107.
In short, since the wear tape 104 starts running and stops when the hole is opened in the sample 100, the longer the running time of the wear tape 104, that is, the longer the running distance, the more the sample 100 has a hole. Can hardly be opened, that is, it can be evaluated that it is excellent in wear resistance.

When the protective tape 20 according to the present embodiment was tested, it was confirmed that the travel distance of the wear tape 104 showing wear resistance achieved 100 to 200 mm as shown in FIG.
On the other hand, when the same test was performed by applying a PP (polypropylene) film having a thickness of 0.3 mm, assuming a non-flame retardant corrugated tube used as a conventional protective material as a sample, numerical values related to wear resistance Was confirmed to be 100-200 mm.
That is, the test result that the protective tape 20 of this embodiment had the outstanding abrasion resistance similar to the corrugated tube with a track record as a protective material of a wire harness was obtained.

In addition, the base material 21 of the protective tape 20 of the present embodiment has a three-layer structure in which a woven fabric 22 and a non-woven fabric 23 are bonded together with a relatively thick rubber-based adhesive 24, and particularly thicker in the intermediate layer. The rubber-based adhesive 24 is excellent in noise reduction.
In order to evaluate the muffling property, two tests, a test related to hitting sound and a test related to rubbing sound, were performed.

  As shown in FIG. 6, the test relating to the hitting sound is performed by placing a sample 100 on a test plate 110 made of a stainless steel plate (PP (polypropylene) plate or PE (polyethylene) plate) having a thickness of 2 mm. A 100 g iron ball 111 is freely dropped with respect to the sample 100 from a position of a height of 30 mm, and the hitting sound generated at that time is placed at a position slightly above the test plate 110 and horizontally from the position where the iron ball 111 is dropped. Measured with a measuring instrument 112 arranged at a position 100 mm apart.

  The result of testing the protective tape 20 according to the present embodiment is as shown by the characteristic line X in the graph of FIG. 7, and the hitting sound is 50 dB or less in the audible region (6 to 20 kHz). This is equivalent to or better than the 2 mm thick soft tape (urethane foam tape), which has a proven track record as being excellent in sound-deadening performance.

  As shown in FIG. 8, the test related to the rubbing sound is performed by placing the sample 100 at a predetermined position on a test plate 115 made of a stainless steel plate (PP (polypropylene) plate or PE (polyethylene) plate) having a thickness of 2 mm. The sample is slid manually in the direction of the arrow at a speed of about 20 mm / sec, and the generated rubbing sound is at a position slightly above the test plate 115 and 30 mm away from the sliding position of the sample 100 in the horizontal direction. The measurement is performed by the measuring instrument 112 provided.

The result of testing the protective tape according to the present embodiment is as shown by the characteristic line Y in the graph of FIG. 9, and the rubbing sound is approximately 20 dB or less in the audible region (6 to 20 kHz). This means that the silencing performance is equivalent to or better than soft tapes (urethane foam tape) with a thickness of 2 mm and 4 mm, which have been proven to be excellent in silencing performance against rubbing noise.
From both of the above tests, it was confirmed that the protective tape of the present embodiment was excellent in the muffling performance against both the hitting sound and the rubbing sound.

  Further, since the base material 21 of the protective tape 20 has a three-layer structure as described above, and a thick rubber-based adhesive 24 is arranged on the intermediate layer, it has excellent flexibility, and a wire bundle Even when the outer periphery of the wire bundle 10 has irregularities or the wire bundle 10 is bent, the wire bundle 10 can be tightly wound around the outer peripheral surface.

As described above, according to the wire harness formed by winding the protective tape 20 according to this embodiment around the wire bundle 10, the following many advantages can be obtained.
First, since the protective tape 20 itself has wear resistance equivalent to that of a corrugated tube that has been proven as a protective material for the wire bundle 10, the function of protecting the wire bundle 10 is sufficiently fulfilled.
In addition, the protective tape 20 can be attached only by spirally winding the protective tape 20 from the roll 32 while wrapping the side edges around the outer periphery of the wire bundle 10. Since the tape 20 is excellent in hand cutting properties, even when it is cut after a predetermined winding, it can be easily cut by hand, so that the mounting work of the protective tape 20 as a protective material can be performed efficiently. it can.
Thus, the working time can be shortened and the number of parts can be reduced, so that the manufacturing cost can be greatly reduced.

Since it is a structure in which an extremely thin protective tape 20 having a thickness of about 0.5 mm is wound, the increase in the diameter of the wire harness is very little, which can contribute to space saving. In addition, the weight can be reduced.
In addition, since the protective tape 20 is excellent in noise reduction, it is possible to suppress the occurrence of noise when the wire harness hits or rubs on surrounding equipment or the like due to vibration or the like.
Furthermore, since the protective tape 20 is also excellent in flexibility, even when the outer periphery of the wire bundle 10 is uneven or the wire bundle 10 is bent, the protective tape 20 is more closely attached to the outer peripheral surface of the wire bundle 10. Can be wound.

<Embodiment 2>
FIG. 10 shows Embodiment 2 of the present invention and shows another form of winding of the protective tape 20.
In the second embodiment, the protective tape 20 is formed in a cylindrical shape while wrapping both side edges with respect to the outer periphery of the wire bundle 10, and is wound in a so-called squeeze shape.
More specifically, the protective tape 20 is applied along the length direction of the wire bundle 10 while being fed out from the scroll 30 (see FIG. 2), and is cut by hand when applied over a predetermined area. After that, the protective tape 20 is wound by wrapping both side edges, for example, about 1/4 of the entire width, and the adhesive layer 25 on the back surface is bonded to the outer peripheral surface of the wire bundle 10.
The same effects as those of the first embodiment can be obtained for the wire harness in which the protective tape 20 is wound in the form according to the second embodiment.

<Embodiment 3>
FIG. 11 shows Embodiment 3 of the present invention, and shows still another form of winding of the protective tape 20.
In the third embodiment, the protective tape 20 is wound around the outer periphery of the electric wire bundle 10 in a cylindrical shape with both side edges being bonded together.
More specifically, the protective tape 20 is applied along the length direction of the wire bundle 10 while being fed out from the scroll 30 (see FIG. 2), and is cut by hand when applied over a predetermined area. After that, the protective tape 20 is wound with the both side edges bonded together, and the adhesive layer 25 on the back surface is bonded to the outer peripheral surface of the wire bundle 10. For example, the size at which the palm is pasted is about 1/4 of the entire width of the protective tape 20.
The effect similar to the said Embodiment 1 can be acquired also about the wire harness in which the protective tape 20 was wound with the form which concerns on Embodiment 3. FIG.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Instead of the woven fabric exemplified in the above embodiment, a knitted fabric may be applied to the fabric material constituting the base material of the protective tape. A “knitted fabric” is a fabric formed by inserting one of warp and weft into a continuous loop and inserting the other into the loop.
(2) A resin film, a woven fabric, a knitted fabric or a foam may be applied to the sheet material constituting the base material of the protective tape in addition to the non-woven fabric exemplified in the above embodiment.

(3) You may distribute the cloth material and sheet material which comprise the base material of a masking tape on the front and back opposite side.
(4) When the surface layer of the base material of the protective tape is made of a material having a small possibility that the adhesive remains or the fibers are pulled when the roll is formed, providing a release film may be omitted. .

DESCRIPTION OF SYMBOLS 10 ... Electric wire bundle 20 ... Protective tape 21 ... Base material 22 ... Woven cloth (cloth material)
23 ... Nonwoven fabric (sheet material)
24 ... Rubber adhesive 25 ... Adhesive layer 26 ... Peeling film 30 ... Scroll

Claims (5)

A protective tape having a pressure-sensitive adhesive layer formed on the back surface of a laminated base material in which a fabric material and a sheet material made of woven or knitted fabric are bonded only through a rubber-based adhesive is wound around a wire bundle. A wire harness characterized by that. The wire harness according to claim 1, wherein a release film is disposed on a surface of the base material in the protective tape. The wire harness according to claim 1 or 2, wherein the protective tape is spirally wound around the outer periphery of the wire bundle while wrapping side edges. The wire harness according to claim 1 or 2, wherein the protective tape is wound in a cylindrical shape while wrapping both side edges with respect to the outer periphery of the wire bundle. The wire harness according to claim 1 or 2, wherein the protective tape is wound around the outer circumference of the wire bundle in a cylindrical shape with both side edges bonded together.

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