JP2015089303A - Exterior material for wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide a wire group with an exterior material capable of performing binding protection and path regulation.SOLUTION: An exterior material is made of an exterior sheet having shape retentivity in a three-dimensionally bent state. The exterior sheet is wound like a rolled sushi around a wire group and brought into a cylindrically bent state. Locking parts, which are provided on both width-direction sides serving as a winding start part and a winding end part in the above state, respectively, are locked to each other so that the state of winding the exterior sheet around the wire group can be maintained.

Description

  The present invention relates to an exterior material for a wire harness, and more specifically, using a novel material, an exterior material having a function of converging and protecting a plurality of electric wires and guiding a required route to regulate a wiring direction, It can be easily formed and can be easily packaged on an electric wire group.

  An adhesive tape or an adhesive sheet is used as an exterior material of this type of wire harness, and the exterior material is wound around the electric wire group. Moreover, it replaces with an adhesive tape, or the corrugated tube and the resin round tube are used together as an exterior material with an adhesive tape, and the electric wire group is penetrated in the tube. Further, there is a case where a protector made of a resin molded product is provided to prevent interference with an external interference material and the routing route is restricted, and a wire group is inserted into the protector.

In places where it is necessary to route the wire harness straight (straight line), there is a problem that the linear holding force is weak just by wrapping the adhesive tape around the electric wire group, and it is expensive to install a protector, As shown to FIG. 8 (A) (B), it hold | maintains linearly using the resin rod. Specifically, the adhesive tape 101 is spirally wound around the electric wire group 100 to form the wire harness 110, and then the linear resin rod 102 is placed along the length direction on the outer surface of the wire harness 110 and again. The adhesive tape 111 is wound around.
However, since the adhesive tape is wound twice when the resin rod is used as described above, there is a problem of poor workability.

  In order to solve the above problem, the applicant of JP 2013-5623 A discloses an adhesive resin layer 202 or a metal layer on the surface of a non-woven fabric layer 201 having thermoformability as shown in FIGS. In addition, a sheet 200 on which a functional layer such as a glass fiber layer is laminated is provided as a protective sheet for a wire harness. The sheet 200 is loaded on a mold in a state of being wound around an electric wire group, and is heated to adhere the adhesive resin layers 202 to each other and is externally mounted on the outer periphery of the electric wire group. Since the shape of the sheet 200 is fixed in the exterior state, when the sheet 200 is straightened, the electric wire group can be guided straight.

JP 2013-5623 A

  When the sheet 200 of Patent Document 1 is used, it is necessary to load and heat the sheet 200 around the electric wire group in a mold, which requires equipment costs and heating work. There is a risk of heat effects on the group. In particular, since the shape is fixed and the flexibility is lost in the state in which the electric wire group is covered with the sheet 200, the shape cannot be easily changed according to the wiring situation. It is necessary to provide many types.

  The present invention is intended to solve the above-described problems, and does not require equipment such as a mold for heating and pressurization, and is necessary for converging protection of a group of electric wires and for restricting a route when wiring to a vehicle. It is an object of the present invention to provide an outer covering material for a wire harness that can be easily formed into a required shape in this area.

  In order to solve the above problems, the present invention comprises an exterior sheet having shape retention in a three-dimensionally bent state, wherein the exterior sheet is wound around a wire group in a sushi roll and bent into a tubular shape, A wire harness exterior material is provided in which the locking portions provided on both sides in the width direction, which are the winding start portion and the winding end portion in the state, are locked to each other to maintain the winding state around the electric wire group. doing.

  A polyethylene ultra-stretched sheet (registered trademark forte manufactured by Sekisui Molding Co., Ltd.) is preferably used as the exterior sheet having the shape retaining force (that is, shape retaining force). The polyethylene ultra-stretched sheet has a unique function in which polyethylene is arranged in a uniaxial direction, can be freely changed in shape, and can retain its shape even after deformation. It has a tensile elastic modulus (GPa) of 10 or more, a tensile strength (MPa) of 38 or more, a 90 ° bend and a return angle of 0 ° to 3 ° with almost no bend back, and a shape retaining force that can maintain the shape in the bent state. It has rich characteristics. In addition, since the cut end is rounded and no edge is generated, the safety is high and the recycling is easy. Therefore, it can be suitably used as an exterior material for a wire harness.

It is preferable that a tab portion for insertion into an electric wire group separated or protruded from the winding start portion is provided in at least one position in the length direction of the exterior sheet.
When the tab portion is inserted from the outer surface of the electric wire group before the entire length of the outer sheet is wound around the electric wire group, the outer sheet can be temporarily held on the electric wire group, and the winding work around the electric wire group can be performed smoothly.

The locking portion of one winding start portion and the locking portion of the other winding end portion sandwiching the central portion in the width direction of the exterior sheet are provided continuously in the length direction,
The locking portion of the winding start portion is upwardly U-shaped, the locking portion of the winding end portion is bent symmetrically as a downward U-shape, and the winding end portion is formed by the vertically horizontal portions of the locking portion of the winding start portion. The lower sideways portion of the latching portion is sandwiched, and the upper sideways portion of the latching portion of the winding start portion is sandwiched by the vertical sideways portion of the latching portion at the winding end portion.

Alternatively, the latching portion of one winding start portion and the latching portion of the other winding end portion sandwiching the central portion in the width direction of the exterior sheet are opposed to each other in the width direction and provided with an interval in the length direction. And
The locking portion of the winding start portion is cut from one end in the length direction and the other is connected, and the locking portion of the winding end portion is cut from the other end in the length direction and one is connected and the cut is made. The inserted parts are fitted and locked together.

Alternatively, the latching portion of one winding start portion and the latching portion of the other winding end portion sandwiching the central portion in the width direction of the exterior sheet are opposed to each other in the width direction and provided with an interval in the length direction. And
The locking portion of the winding start portion is a hole that becomes a lock hole, and the locking portion of the winding end portion is a protruding piece that becomes a lock piece, and the lock piece is inserted into the lock hole and locked. .

  As described above, the exterior material for a wire harness according to the present invention has a bendability that allows an operator to bend easily by hand, and has a shape retention force that does not cause bending back once bent. Using the sheet as an exterior sheet, it has a simple shape that is simply provided by bending or cutting in advance at the winding start part and the winding end part to lock each other in a state of being wound around in a sushi roll. Therefore, it can be provided at low cost and can be easily wound and held around the wire group of the wire harness. In addition, since the exterior sheet has a shape retention force and does not loosen when wound around a group of wires, there is no need to wind a resin rod used conventionally along the wire harness when wiring the wire harness straight. Can be.

The state which wound and wrapped the exterior sheet around the electric wire group of a 1st embodiment of the present invention is shown, (A) is a perspective view and (B) is an important section expanded sectional view. The exterior sheet is shown, (A) is a plan view, (B) is a cross-sectional view taken along line BB of (A), (C) is an enlarged view of (B), and (D) is for locking the locking portions together. It is drawing which shows the state which carried out. (A)-(C) are drawings which show the process of armoring an electric wire group with an exterior sheet. The 1st modification of 1st Embodiment is shown, (A) is an expanded sectional view of an exterior sheet, (B) is drawing which shows the state which latched the latching | locking parts. It is a schematic plan view which shows the 2nd modification of 1st Embodiment. (A) is a top view of an exterior sheet | seat, (B) is a principal part enlarged view of (A), (C) is drawing which shows the latching state of latching | locking parts. 3rd Embodiment is shown, (A) is a top view of an exterior sheet, (B) is a principal part enlarged view which shows the attachment state to an electric wire group, (C) is a modification of the latching state of latching parts. FIG. (A) (B) is drawing which shows a prior art example. (A) and (B) are drawings showing other conventional examples.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 show a first embodiment.
A wire harness 1 shown in FIG. 1 is routed in an automobile, and a resin-made exterior sheet 3 is wound around the outer periphery of the electric wire group 2 in a sushi roll to form a cylindrical shape. It can be held without using an adhesive or the like.

The exterior sheet 3 has a thickness of 0.4 mm to 1.0 mm and can be easily bent, but has a shape holding force that is held in a bent state unless a bending force due to an external force acts. That is, it consists of a shape-retaining sheet that has a shape-retaining force without bending back in a three-dimensionally bent state. Therefore, when the exterior sheet 3 is curved around the outer periphery of the electric wire group 2 and wound into a cylindrical shape, the outer sheet 3 is bent back from the cylindrical shape and does not return to the original flat sheet, but is held in a cylindrical shape. In addition, the winding start portion 3s and the winding end portion 3e of the exterior sheet 3 are provided with locking portions 3a and 3b that are bent in advance and locked to each other, and the locking portions 3a and 3b are locked to each other to form a cylindrical shape. It is assumed that the winding state of can be maintained.
Therefore, it is not necessary to fix the sheet with the adhesive while the sheet is wound around the electric wire group, or it is not necessary to hold the wound state by winding the adhesive tape.

  As the exterior sheet 3 having the shape retention force, in this embodiment, a polyethylene super stretched sheet made of Forte (registered trademark) manufactured by Sekisui Molding Co., Ltd. is used. The polyethylene super-stretched sheet is a polyethylene film stretched and controlled in a uniaxial direction at a high magnification, and can be freely changed in shape. The bending angle is 0 ° to 3 °, and there is almost no bending return. It has characteristics that are rich in shape retention and can retain its shape in the state. The density is 0.97, the tensile modulus (GPa) is 10 or more, and the tensile strength (MPa) is 38 or more.

  The outer sheet 3 has a width Y shown in FIG. 2 having a length corresponding to the outer peripheral length L1 of the wire group 2 to be wound and a length before bending of the locking portions 3a and 3b provided on both sides thereof. The length is obtained by adding L2 and L3. The locking portions 3 a and 3 b provided at both ends in the width direction are provided over the entire length in the length direction X of the exterior sheet 3. In this embodiment, since the locking portions 3a and 3b are symmetrical, the lengths L2 and L3 are equivalent.

  One end in the length direction of the exterior sheet 3 is such that the locking portion 3a and the central portion 3c on the winding start side are longer than the locking portion 3b on the winding end side by the length of the bellows, and from the winding start end 3s to the central portion 3c. A slight cut is provided to provide a spatula portion 3d for insertion into the wire group. By inserting the spatula 3 d from the outer peripheral surface of the wire group 2 into the inside, the winding start portion 3 s of the exterior sheet 3 can be temporarily held on the outer periphery of the wire group 2.

As shown in FIGS. 2B and 2C, the locking portion 3a of the winding start portion 3s of the exterior sheet 3 is provided by bending upward from one end in the width direction of the central portion 3c into an upward and downward lateral portion 3a- 1 and 3a-2 are connected by a vertical connecting portion 3a-3.
Similarly, the engaging portion 3b of the winding end portion 3e of the exterior sheet 3 is provided by bending downward from the other end in the width direction of the central portion 3c into a U-shape, and vertically and horizontally facing portions 3b-1 and 3b-2 are vertically connected portions. It is the shape connected by 3b-3.

  The height of the vertical connecting portions 3 a-3 and 3 b-3 of the locking portions 3 a and 3 b is slightly smaller than the thickness of the exterior sheet 3. As a result, the lower lateral portion 3b-2 of the locking portion 3b at the end of the winding is placed in the locking space 3a-4 sandwiched between the vertical and horizontal portions 3a-1 and 3a-2 of the locking portion 3a of the winding start portion. I try to push it in. In this state, the lower horizontal portion 3b-2 of the locking portion 3b is sandwiched between the upper and lower horizontal portions 3a-1 and 3a-2 of the locking portion 3a, and at the same time, the upper horizontal portion 3a-1 of the locking portion 3a is locked. The portion 3b is sandwiched between the up and down horizontal portions 3b-1 and 3b-2, and the winding start portion 3s and the winding end portion 3e are locked to the locking portions 3a and 3b over the entire length in the longitudinal direction X of the exterior sheet 3. Thus, it can be held in a wound state.

Next, a procedure for attaching the exterior sheet 3 to the wire group 2 will be described with reference to FIG.
First, the continuously formed outer sheet is cut into a size having a required width Y and length X corresponding to the outer peripheral length of the wire group 2 to be wound and the length of the winding region.
Before winding the exterior sheet 3 having the required width Y and length X around the wire group 2, as shown in FIG. 2, the winding end portion 3e is cut off at the required length at one end in the length direction, Cuts are made from the winding start portion 3s to the central portion 3c to form the spatula 3d.
Further, the winding portions 3a and 3b of the winding start portion 3s and the winding end portion 3e at both ends in the width direction are formed by bending each 90 degrees twice. As a result, the shape shown in FIG.

  Next, as shown in FIG. 3 (B), on one end side in the length direction of the electric wire group 2 around which the outer sheet 3 is wound, the spatula 3d of the outer sheet 3 is inserted into the electric wire group 2 from the outer surface, and the outer sheet 3 Is temporarily held in the electric wire group 2.

  Next, the entire length of the winding start portion 3 s of the exterior sheet 3 is pressed against the outer peripheral surface of the wire group 2 and wound in a sushi roll shape. In the winding start portion 3s, the locking portion 3a is protruded toward the outer peripheral surface. When the exterior sheet 3 is wound around the electric wire group 2 once, the locking portion 3b of the winding end portion 3e overlaps the upper surface of the locking portion 3a of the winding start portion 3s as shown in FIG. The lower horizontal portion 3b-2 of the locking portion 3b is pushed into the locking space sandwiched between the upper and lower horizontal portions 3a-1 and 3a-2 of the locking portion 3a. The shape of the locked state between the locking portions 3a and 3b is also maintained.

  Since a bending force is applied when the outer sheet 3 is wound around the outer periphery of the electric wire group 2, the outer sheet 3 is maintained in a state of being deformed into a cylindrical shape, and the locking portion 3b of the winding end 3e is simply started to be wound. The exterior sheet 3 can be held around the outer periphery of the wire group 2 by being locked to the locking portion 3a of 3s with the entire length in the length direction X.

  Thus, by using the exterior sheet 3 having a shape-retaining force capable of retaining the shape in a bent state, the outer sheet 3 is wound around the outer periphery of the electric wire group 2 to form a cylindrical shape, and in this state, the locking portion 3b of the winding end portion 3e is formed. If locked to the locking portion 3a of the winding start portion 3s, this locked state is also maintained. Therefore, the wire group 2 can be packaged with only the exterior sheet 3 without using an adhesive or an adhesive tape. In addition, when the outer sheet 3 is straight in the length direction and wound around the wire group 2, the outer sheet 3 has a linear holding force, so that the wire harness is held in a straight line without using the resin rod described in the conventional example. Can be routed.

4A and 4B show a first modification of the first embodiment.
In the first modified example, the vertical connection portion 3a-3 of the locking portion 3a is provided with the locking holes 3a-h at intervals in the length direction, while the locking hole 3a-h is provided at the tip of the locking portion 3b. The latching piece 3b-4 which bends after inserting in is provided, and it is set as the structure which reinforces latching force more.

FIG. 5 shows a second modification of the first embodiment.
In the second modified example, the wire harness 1 that holds the outer sheet 3 wound around the electric wire group 2 is routed along the routing route when the car is routed, and the outer sheet 3 is curved in the routing route during this routing. The curved portion 3Z1 and the refracting portion 3Z2 are provided by being bent and refracted at the location and the refraction location.

6A to 6C show a second embodiment.
The exterior sheet 3 itself of the second embodiment is made of a resin sheet similar to that of the first embodiment and has a shape retention force.
In 2nd Embodiment, the shape of the latching | locking part 30a, 30b provided in the winding start part 3s and the winding end part 3e of the width direction both ends of the exterior sheet 3 is changed with the latching | locking part 3a, 3b of 1st Embodiment.
The latching | locking parts 30a and 30b are provided in the length direction at intervals, without providing continuously in the full length of the length direction. Further, the locking portions 30a and 30b are provided on a one-to-one basis at positions facing the width direction.

The locking portion 30a of the winding start portion 3s has one side X-1 in the length direction continuous with the center portion 3c, and the other side X-2 is separated by inserting a slit 30s, and one side in the length direction is separated from the center portion 3c. The connecting portion 30a-1 connected to the other is provided as the separating portion 30a-2.
Similarly, the engaging part 30b of the winding end part 3e is a connecting part 30b-1 in which the other side X-2 in the length direction is continuous with the central part 3c, and the separating part 30b- in which the one side X-1 is provided with a slit 30s. 2. Thus, the latching | locking parts 30a and 30b of the exterior sheet 3 are not formed by bending like the latching | locking parts 3a and 3b of 1st Embodiment.
In addition, as in the first embodiment, the outer sheet 3 is provided with a spatula portion 3d projecting from the winding start side end of the central portion 3c and a cut in the central portion 3c as in the first embodiment. It is made to continue with part 3d.

The latching portions 30a and 30b and the spatula portion 3d are provided in the exterior sheet 3 in advance, and the spatula portion 3d is first inserted from the outer surface of the wire group 2 and temporarily held in the same manner as in the first embodiment.
Next, the sushi roll is wound around the outer circumference of the electric wire group 2. In this state, the locking portion 30a of the winding start portion 3s and the locking portion 30b of the winding end portion 3e are positioned so as to overlap each other.
As shown in FIG. 6C, the slits 30s and 30s of the locking portions 30a and 30b are fitted together, and the connecting portion 30a-1 of the locking portion 30a and the separation portion 30b-2 of the locking portion 30b are adjacent to each other. The separating portion 30a-2 of the locking portion 30a and the connecting portion 30b-1 of the locking portion 30b are adjacent to each other, and the winding start portion 3s and the winding end portion 3e are locked to maintain the winding state.
Other configurations and operational effects are the same as those of the first embodiment, and thus description thereof is omitted.

7A and 7B show a third embodiment.
The exterior sheet 3 itself of the third embodiment is made of a resin sheet similar to those of the first and second embodiments and has a shape retention force.
In 3rd Embodiment, the shape of the latching | locking part 31a, 31b provided in the winding start part 3s and the winding end part 3e of the width direction both ends of the exterior sheet 3 is changed with the latching | locking part of 1st, 2nd embodiment. And like 2nd Embodiment, the latching | locking part 31a, 31b is not provided continuously in the full length of the length direction, but the latching | locking part 31a provided in the opposing position by 1 to 1 in the width direction Y, 31b is provided at intervals in the length direction.

The locking portion 31a of the winding start portion 3s is a long hole that is a lock hole, and the locking portion 31b of the winding end portion 3e is a rectangular protruding piece that is a lock piece. Thus, the latching | locking part 31a, 31b of the exterior sheet 3 is not bent and formed like the latching | locking part 3a, 3b of 1st Embodiment.
Further, as in the second embodiment, the outer sheet 3 is provided with a spatula portion 3d projecting from the winding start side end of the central portion 3c and a cut in the central portion 3c as in the second embodiment. It is made to continue with part 3d.

The locking portions 31a and 31b and the spatula portion 3d are provided in the exterior sheet 3 in advance, and the spatula portion 3d is first inserted from the outer surface of the wire group 2 and temporarily held, as in the first embodiment. Next, the sushi roll is wound around the outer circumference of the electric wire group 2. In this state, the locking pieces of the locking part 31b of the winding end part 3e overlap with each other in the locking hole of the locking part 31a of the winding start part 3s, and the locking piece is inserted and locked into the locking hole. The portions 31a and 31b are locked to each other and the winding state is maintained.
Other configurations and operational effects are the same as those of the first embodiment, and thus description thereof is omitted.

  In addition, as shown in FIG. 7C, after inserting the locking piece locking portion 31b into the locking hole locking portion 31a and then folding back the locking piece 31b and stacking it on the peripheral edge of the locking hole, the locking force is increased. Can be increased.

  The present invention is not limited to the above-described embodiment, and in the second and third embodiments, the spatula portion may be provided at both ends instead of one end in the length direction of the exterior sheet, and further, an interval is provided in the length direction. In addition, a spatula portion may be provided at an intermediate position. As described above, when the spatula portions are provided at a plurality of locations, the exterior sheet can be reliably temporarily held by the electric wire group.

Further, the exterior sheet itself is a sheet in which an elastic sheet such as a urethane sheet is laminated and integrated on one surface of the above-mentioned polyethylene ultra-stretched sheet, and the elastic sheet is positioned on the outer surface side in a state of being wound around the electric wire group, so that the buffer function and the vibration damping function You may add the high function which has.
Further, a shield layer made of metal foil or the like is laminated and integrated on the position surface of the polyethylene ultra-stretched sheet so as to have a shield function, and the shield layer is positioned on the outer surface side in a state of being wound around the electric wire group, and the exterior material with the shield function High function may be added as

DESCRIPTION OF SYMBOLS 1 Wire harness 2 Electric wire group 3 Exterior sheet | seat 3a, 3b Locking part 3c Center part 3e Winding end part 3d Bella part 3s Winding start part

Claims (6)

  It is composed of an exterior sheet having shape retention in a three-dimensionally bent state, and the exterior sheet is wound around a wire group in a sushi roll and bent into a cylindrical shape, and in this state, a winding start portion and a winding end portion are formed. An outer covering material for a wire harness that is capable of retaining a winding state around an electric wire group by mutually locking engaging portions provided on both sides in the width direction.   The exterior material for a wire harness according to claim 1, wherein the exterior sheet having the shape retaining force is made of a polyethylene stretched sheet, and has a characteristic that the shape can be changed by bending from a flat state and the shape after deformation can be retained.   The wire harness for wire harness according to claim 1 or 2, wherein a tab portion for insertion into an electric wire group separated or protruded from a winding start portion is provided in at least one position in the length direction of the exterior sheet. Exterior material. The locking portion of one winding start portion and the locking portion of the other winding end portion sandwiching the central portion in the width direction of the exterior sheet are provided continuously in the length direction,
The locking portion of the winding start portion is upwardly U-shaped, the locking portion of the winding end portion is downwardly U-shaped and bent symmetrically, and the winding end portion is formed by vertically and horizontally facing portions of the locking portion of the winding start portion. 4. The lower sideways portion of the locking portion of the winding portion is sandwiched, and the upper sideways portion of the locking portion of the winding start portion is sandwiched by the vertical sideways portion of the locking portion of the winding end portion. 5. The exterior material for wire harnesses of Claim 1. The latching portion of one winding start portion and the latching portion of the other winding end portion sandwiching the central portion in the width direction of the exterior sheet are provided facing each other in the width direction and spaced in the length direction,
The locking portion of the winding start portion is cut from one end in the length direction and the other is connected, and the locking portion of the winding end portion is cut from the other end in the length direction and one is connected and the cut is made. The exterior material for a wire harness according to any one of claims 1 to 3, wherein the inserted portion is fitted and locked. The latching portion of one winding start portion and the latching portion of the other winding end portion sandwiching the central portion in the width direction of the exterior sheet are provided facing each other in the width direction and spaced in the length direction,
The locking portion of the winding start portion is a hole that becomes a lock hole, and the locking portion of the winding end portion is a protruding piece that becomes a lock piece, and the lock piece is inserted into the lock hole and locked. The exterior material for wire harnesses according to any one of claims 1 to 3.

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