Sheet for wire harness and wire harness

Abstract

To provide a sheet for a wire harness and a wire harness that can reduce loss even in punching.SOLUTION: A sheet 1 for a wire harness is attached to a branch portion where some of electric wires are branched off from a wire harness main body composed of a plurality of electric wires, and includes: a main body portion 10 extending along a first direction; and a plurality of protrusions 20 which protrude from a side of the main body portion 10 in a second direction intersecting the first direction and are narrower than a length of the main body portion 10 in the first direction. The sheet for the wire harness is formed so that at least one of the plurality of protrusions 20 matches with a space S that is arranged between two adjacent protrusions 20 on the side of the main body portion 10 and configured approximately symmetrically with respect to a straight line which passes through a center position O of the main body portion 10 and is perpendicular to the first direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sheet for a wire harness and a wire harness. [Background technology]

[0002] Conventionally, there is known a wire harness in which some electric wires are branched off from a wire harness main body composed of a plurality of electric wires to form a branch line, and tape is wrapped around the branched portion between the wire harness main body and the branch line to protect the electric wires and regulate their paths. In this wire harness, the tape is wrapped densely in three dimensions at the branched portion.

[0003] However, it is not easy to wind the tape three-dimensionally at the branching portion of the wire harness, and considering the future automatic manufacturing of wire harnesses, the work of winding the tape three-dimensionally is not preferable because it complicates the structure of the robot arm. Therefore, a sheet for wire harnesses has been proposed for protecting or regulating the path of substantially the entire wire harness including the branching portion (see, for example, Patent Document 1). This sheet for wire harnesses is formed by punching out a large rectangular sheet according to the wiring shape of the wire harness, and has a structure in which the electric wires are sandwiched between two punched sheets. By using such a sheet for wire harnesses, it is not necessary to wind the tape three-dimensionally at the branching portion, and it is possible to protect the entire wire harness including the branching portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-44874 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the sheet described in Patent Document 1 is formed by punching out a large rectangular sheet, and the remaining portion after punching is subject to disposal, resulting in a large loss.

[0006] The present invention has been made to solve such conventional problems, and an object of the present invention is to provide a sheet for a wire harness and a wire harness that can reduce loss even during punching. [Means for solving the problem]

[0007] The sheet for a wire harness according to the present invention is a sheet for a wire harness that is attached to a branch portion where some of the electric wires are branched off from a wire harness main body that is configured having a plurality of electric wires, and includes a main body portion that extends along a first direction, and a plurality of protrusions that protrude to the sides of the main body portion in a second direction that intersects the first direction and are narrower than the length of the main body portion in the first direction, and are configured to be approximately linearly symmetrical with respect to a straight line that passes through a center position of the main body portion and is perpendicular to the first direction, and is shaped so that the space between two adjacent protrusions on the side of the main body portion matches with at least one of the plurality of protrusions.

[0008] The wire harness according to the present invention includes a wire harness main body including a plurality of electric wires, and the sheet for a wire harness according to claim 1 attached to a branching portion at which some of the electric wires are branched off from the wire harness main body. Effect of the Invention

[0009] According to the present invention, it is possible to provide a sheet for a wire harness, etc., which is capable of reducing loss even during punching. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view showing a wire harness sheet according to a first embodiment of the present invention. [Diagram 2]FIG. 2 is a perspective view showing a wire harness using the wire harness sheet shown in FIG. 1. [Diagram 3] 2A and 2B are plan views showing the state of the wire harness sheet shown in FIG. 1 before punching, where (a) shows a first example and (b) shows a second example. [Figure 4] FIG. 11 is a plan view showing a sheet for a wire harness according to a second embodiment. [Diagram 5] FIG. 5 is a perspective view showing a wire harness using the wire harness sheet shown in FIG. 4. [Figure 6] FIG. 11 is a plan view showing a sheet for a wire harness according to a third embodiment. [Figure 7] FIG. 7 is a perspective view showing a wire harness using the wire harness sheet shown in FIG. 6. [Figure 8] 7A and 7B are perspective views showing a wire harness using the wire harness sheet shown in FIG. 6, in which (a) shows a first state and (b) shows a second state. [Figure 9] FIG. 11 is a plan view showing a wire harness sheet according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will be described below along with preferred embodiments. Note that the present invention is not limited to the embodiments shown below, and can be modified as appropriate within the scope of the present invention. In addition, in the embodiments shown below, some configurations are omitted from illustration and description, but it goes without saying that publicly known or well-known technologies are appropriately applied to the details of the omitted technologies within the scope of the contents described below.

[0012] Fig. 1 is a plan view showing a sheet for a wire harness according to a first embodiment of the present invention. Fig. 2 is a perspective view showing a wire harness using the sheet for a wire harness shown in Fig. 1. As shown in Figs. 1 and 2, the wire harness WH according to this embodiment includes a wire harness main body WH1 having a plurality of electric wires and a sheet for a wire harness 1.

[0013] The wire harness main body WH1 shown in Fig. 2 is configured to have a plurality of electric wires. From this wire harness WH, some electric wires are branched in a direction different from the longitudinal direction of the wire harness WH, leading to a branch wire WH2. The sheet 1 for wire harness is attached to a branch portion B corresponding to a base portion from which such a branch wire WH2 is led out. The sheet 1 for wire harness has a predetermined abrasion resistance to protect the branch portion B and regulate a path by the sheet.

[0014] The sheet 1 for a wire harness shown in FIG. 1 is made only of a heat-weldable base material such as PVC (polyvinyl chloride) or olefin (e.g., PP (polypropylene) or PE (polyethylene)), and is attached to the branching portion B by heat welding. The sheet 1 for a wire harness may have a two-layer structure in which an adhesive layer is provided on a base material such as PVC or olefin, and the sheet 1 for a wire harness may be attached to the branching portion B by using the adhesive layer. Furthermore, the sheet 1 for a wire harness may have a three-layer structure in which a primer is interposed between the base material and the adhesive layer.

[0015] The substrate is not limited to PVC or olefin, and may be made of a film or cloth of fluorine, PET (polyethylene terephthalate), polyimide, silicone, nylon, etc. The adhesive may contain one or more of natural rubber, styrene-isoprene-styrene block copolymer, and acrylic resin.

[0016] Such a wire harness sheet 1 includes a main body 10 and a plurality of protruding portions 20. The main body 10 is a member extending in a first direction corresponding to the longitudinal direction of the wire harness main body WH1. The plurality of protruding portions 20 extend in a second direction intersecting with the first direction, and are narrower than the length of the main body 10 in the first direction and protrude to the side of the main body 10. In this embodiment, the plurality of protruding portions 20 are configured by three protruding portions 20. The first and second protruding portions 21 and 22 protrude from one side of the main body 10, and the third protruding portion 23 protrudes from the other side opposite to the main body 10. Note that, in FIG. 1, an example in which the second direction is perpendicular to the first direction is shown, but it is not limited to the case where the second direction is perpendicular to the first direction, and may have an inclination with respect to the perpendicular direction as long as it is a direction that intersects.

[0017] Moreover, the sheet 1 for a wire harness according to this embodiment is substantially symmetrical (when folded along the line, the area of ​​the portion that does not overlap is 5% or less of the total area, the same applies below) with respect to a line (a line extending in the second direction in FIG. 1) that passes through the center position O of the main body 10 and is perpendicular to the first direction. Therefore, the sheet 1 for a wire harness is not biased to one side in the longitudinal direction with respect to the branching portion B shown in FIG. 2, and is configured to reduce wasted portions.

[0018] Furthermore, the sheet 1 for a wire harness shown in FIG. 1 has a shape in which at least one of the plurality of protruding portions 20 fits into a space S between two adjacent protruding portions 21, 22 on the side of the main body portion 10. As shown in FIG.

[0019] 3A and 3B are plan views showing the state of the sheet for wire harness 1 shown in FIG. 1 before punching, where (a) shows a first example and (b) shows a second example. As shown in FIG. 3A, the sheet for wire harness 1 is manufactured by punching out from one large rectangular sheet BS. Here, the sheet for wire harness 1 shown in FIG. 1 is configured so that the shape of the space S between the first and second protruding parts 21 and 22 matches the shape of the third protruding part 23. Therefore, as shown in FIG. 3A, the third protruding part 23 of the adjacent sheet for wire harness 1 can be created by the space S formed by punching out a specific sheet for wire harness 1, and loss can be further reduced.

[0020] In addition, the sheet 1 for a wire harness shown in FIG. 1 is not limited to the case where the shape of the space S between the first and second protruding portions 21, 22 matches the shape of the third protruding portion 23. For example, the shape of the space S between the first and second protruding portions 21, 22 may match at least one of the first and second protruding portions 21, 22. This allows the configuration shown in FIG. 3(b). In the example shown in FIG. 3(b), the second protruding portions 22 of the adjacent sheets 1 for a wire harness can be created when punching to create the space S. This also makes it possible to further reduce loss.

[0021] Next, a detailed example of the sheet for wire harness 1 according to the present embodiment will be described. As described below, the sheet for wire harness 1 preferably has a predetermined abrasion resistance. Therefore, in the case of the detailed configuration below, the thickness of the sheet for wire harness 1 is preferably 0.10 mm or more. To explain in detail, a vinyl sheet (PVC sheet) manufactured by Nitto Denko was used as the base material for the sheet for wire harness 1. In addition, a double-sided tape was used as the adhesive layer for the base material. The double-sided tape used was No. 7021 (0.05 mm thick) manufactured by Teraoka Seisakusho.

[0022] Abrasion resistance tests were performed on such a sheet 1 for wire harnesses by changing the overall thickness according to the following steps 1) to 5). 1) An appropriate length of the sheet 1 for wire harnesses was attached to an aluminum pipe with a diameter of 10 mm as a test piece. 2) The aluminum pipe with the test piece attached was set in an abrasion tester specified in JASO D 608. 3) The abrasion tape of the abrasion tester was pressed against the sheet 1 for wire harnesses with a load of 4.4 N. 4) The pressed abrasion tape was moved at a speed of 1500 mm / min. 5) The distance the abrasion tape moved until it came into contact with the aluminum pipe was measured.

[0023] As a result of the measurement by the above-mentioned abrasion resistance test, when the total thickness of the sheet 1 for a wire harness is 0.05 mm, the movement distance is less than 100 mm, and when the total thickness is 0.10 mm, the movement distance is 100 mm or more. Also, when the total thickness is 0.20 mm or more, the movement distance is 100 mm or more. In this detailed example, for example, a movement distance of 100 mm or more is required, so that the thickness of the sheet 1 for a wire harness is preferably 0.10 mm or more.

[0024] Next, a method for attaching the sheet for a wire harness 1 according to the present embodiment will be described with reference to Fig. 2. Note that the attachment method will be described here by taking as an example the sheet for a wire harness 1 having an adhesive layer provided on a substrate.

[0025] First, the main body 10 of the wire harness sheet 1 is attached to the wire harness main body WH1 from the side opposite to the direction in which the branch line WH2 extends. At this time, the main body 10 is attached so that the third protrusion 23 is in a positional relationship corresponding to the branch line WH2. Here, the corresponding positional relationship means that the third protrusion 23 is located to the side of the branch line WH2. As a result, the first and second protrusions 21, 22 are shifted in the longitudinal direction from the branch line WH2.

[0026] Next, the first and second protruding portions 21, 22 are attached so as to be wrapped around the wire harness main body WH1, and the third protruding portion 23 is attached so as to be aligned with the branch wire WH2. In this manner, the sheet 1 for a wire harness is attached to the branch portion B.

[0027] In this way, the wire harness sheet 1 according to the first embodiment has a main body 10 and a plurality of protrusions 20, and is configured to be substantially line-symmetrical with respect to a straight line that passes through the center position O of the main body 10 and is perpendicular to the first direction. Therefore, it is possible to contribute to reducing wasteful portions without being configured to be biased toward one side in the longitudinal direction of the wire harness main body WH1 with the branch portion B as the center. In addition, the space S between two adjacent protrusions 21, 22 on the side of the main body 10 matches the shape of at least one of the plurality of protrusions 20. Therefore, when punching out to create the portion of the space S, the protrusion 20 in another wire harness sheet 1 is created, and it is also possible to create a plurality of wire harness sheets 1 from a rectangular sheet with less loss. Therefore, it is possible to provide a wire harness sheet 1 that can reduce loss even by punching out.

[0028] Moreover, the wire harness WH according to the first embodiment includes the wire harness main body WH1 and the sheet for wire harness 1 attached to the branch portion B. Therefore, it is possible to provide the wire harness WH constituted by the sheet for wire harness 1 with reduced loss even when punched out.

[0029] Next, a second embodiment of the sheet for a wire harness according to the present invention will be described. The sheet for a wire harness according to the second embodiment is similar to that of the first embodiment, but has a partly different configuration. The differences from the first embodiment will be described below.

[0030] Fig. 4 is a plan view showing a sheet for a wire harness according to the second embodiment. The sheet for a wire harness 1 shown in Fig. 1 has two protruding parts 21, 22 on one side of the main body 10, and one protruding part 23 on the other side. In contrast, the sheet for a wire harness 2 according to the second embodiment has three protruding parts 21-23 on one side of the main body 10, and two protruding parts 24, 25 on the other side. In addition, each of the protruding parts 21-25 according to the second embodiment is longer than the protruding parts 21-23 of the first embodiment.

[0031] The sheet 2 for a wire harness according to the second embodiment has three protruding portions 21 to 23 on one side, so that two gaps S are present on the one side. Similarly, the sheet 2 for a wire harness has two protruding portions 24, 25 on the other side, so that one gap S is present on the other side.

[0032] In the second embodiment, at least one of these spaces S has a shape that matches at least one of the five protrusions 21 to 25. This makes it possible to reduce loss when the wire harness sheet 2 is punched out from the large sheet BS, as in the case described with reference to Fig. 3 .

[0033] Fig. 5 is a perspective view showing a wire harness WH using the sheet for wire harness 2 shown in Fig. 4. The sheet for wire harness 2 according to the second embodiment is attached to, for example, a branch portion B where two branch wires WH2 branch closely from a wire harness main body WH1. The attachment method here will also be described taking as an example the sheet for wire harness 2 having an adhesive layer provided on a base material.

[0034] First, the main body 10 of the wire harness sheet 2 is attached to the wire harness main body WH1 from the side opposite to the direction in which the two branch wires WH2 extend. At this time, the main body 10 is attached so that the fourth and fifth protruding portions 24, 25 are positioned to correspond to the two branch wires WH2, respectively. As a result, the first to third protruding portions 21 to 23 are positioned offset from the two branch wires WH2 in the longitudinal direction.

[0035] Next, the first to third protruding portions 21 to 23 are attached so as to be wrapped around the wire harness main body WH1, and the fourth and fifth protruding portions 24, 25 are attached so as to be aligned with the respective branch wires WH2. In this manner, the sheet 2 for a wire harness is attached to the branch portion B.

[0036] In this way, according to the sheet for wire harness 2 and the wire harness WH according to the second embodiment, the same effects as those of the first embodiment can be obtained. That is, it is possible to provide the sheet for wire harness 2 capable of reducing loss even by punching, and the wire harness WH constituted by the sheet for wire harness 2.

[0037] Next, a third embodiment of the sheet for a wire harness according to the present invention will be described. The sheet for a wire harness according to the third embodiment is similar to that of the first embodiment, but has a partly different configuration. The differences from the first embodiment will be described below.

[0038] Fig. 6 is a plan view showing a sheet for a wire harness according to a third embodiment. The sheet for a wire harness 1 shown in Fig. 1 has two protruding parts 21, 22 on one side of the main body 10, and one protruding part 23 on the other side. In contrast, the sheet for a wire harness 3 according to the third embodiment has two protruding parts 21, 22 on one side of the main body 10, and two protruding parts 23, 24 on the other side. In addition, each of the protruding parts 21 to 24 according to the third embodiment is longer than the protruding parts 21 to 23 of the first embodiment.

[0039] The sheet 3 for a wire harness according to the third embodiment has two protruding portions 21, 22 on one side and two protruding portions 23, 24 on the other side, so that one space S exists on each of the one side and the other side. In the third embodiment, at least one of these spaces S has a shape that matches at least one of the four protruding portions 21 to 24. This makes it possible to reduce loss when the sheet 3 for a wire harness is punched out from the large sheet BS, as in the case described with reference to FIG. 3.

[0040] Additionally, in the third embodiment, the protrusions 20 are also substantially symmetrical with respect to a straight line that passes through the center position O of the main body 10 and is aligned along the first direction. This allows the protrusions 20 to be paired with the main body 10 in between, and the pair of protrusions 20 to sandwich the branch line WH2 or to place the pair of protrusions 20 bonded together beside the branch line WH2, thereby enhancing the path regulation force.

[0041] Fig. 7 is a perspective view showing a wire harness WH using the sheet for wire harness 3 shown in Fig. 6. The sheet for wire harness 3 according to the third embodiment is attached to, for example, a branch portion B where two branch wires WH2 branch closely from a wire harness main body WH1. The attachment method here will also be described taking as an example the sheet for wire harness 3 having an adhesive layer provided on a base material.

[0042] First, the main body 10 of the sheet 3 for a wire harness is attached to the wire harness main body WH1 from the side opposite to the direction in which the two branch wires WH2 extend. At this time, the main body 10 is attached so that the first to fourth protruding portions 21 to 24 are positioned to correspond to the two branch wires WH2, respectively.

[0043] Next, the first to fourth protruding portions 21 to 24 are attached along the branch lines WH2. In this manner, the sheet 3 for a wire harness is attached to the branch portion B.

[0044] Fig. 8 is a perspective view showing a wire harness WH using the wire harness sheet 3 shown in Fig. 6, (a) showing a first state and (b) showing a second state. The wire harness sheet 3 according to the third embodiment may be attached to, for example, a branch portion B where one branch wire WH2 branches off from a wire harness main body WH1.

[0045] In this case, first, the main body 10 of the sheet 3 for wire harness is attached to the wire harness main body WH1 from the side opposite to the direction in which the branch wire WH2 extends. At this time, a line L (a line along the first direction: see FIG. 6) displaced from the center position O of the main body 10 is attached to a portion of the wire harness main body WH1 that is directly opposite the branch wire WH2. Note that the main body 10 is attached so that one branch wire WH2 corresponds to a space S between the first and second protruding parts 21, 22 and a space S between the third and fourth protruding parts 23, 24, as shown in FIG. 8(a).

[0046] Next, as shown in Fig. 8(b), the first to fourth protruding parts 21 to 24 are each attached in a cross-pattern. At this time, since the line L is arranged to be directly opposite the branch line WH2, the adhesive layer is partially exposed at the upper part of the cross-pattern.

[0047] Thereafter, the exposed adhesive layer is attached onto the main body portion 10. This allows the protruding portions 20 to be wound around both sides of the branch wire WH2.

[0048] In this way, according to the sheet for wire harness 3 and the wire harness WH according to the third embodiment, the same effects as those of the first embodiment can be obtained. That is, it is possible to provide the sheet for wire harness 3 capable of reducing loss even by punching, and the wire harness WH constituted by the sheet for wire harness 3.

[0049] Furthermore, according to the third embodiment, the protrusions 20 are configured to be substantially symmetrical with respect to a straight line along the first direction. Therefore, the protrusions 20 are paired on both sides of the main body 10, and by bonding the paired protrusions 20 together, stronger protection can be achieved and the path regulation power can be increased.

[0050] Next, a fourth embodiment of the sheet for a wire harness according to the present invention will be described. The sheet for a wire harness according to the fourth embodiment is similar to that of the third embodiment, but has a partly different configuration. The differences from the third embodiment will be described below.

[0051] Fig. 9 is a plan view showing a sheet for a wire harness according to a fourth embodiment. In the sheet for a wire harness 3 shown in Fig. 6, both the protruding portions 20 and the spaces S between the protruding portions 20 are formed in a rectangular shape. In contrast, in the sheet for a wire harness 4 according to the fourth embodiment, both the protruding portions 20 and the spaces S between the protruding portions 20 are R-shaped (curvature structure), and these spaces match. In Fig. 9, all the protruding portions 20 and the spaces S between the protruding portions 20 are R-shaped, but this is not limited to all of them, and at least one of the protruding portions 20 and at least one space S matching this protruding portion 20 may be R-shaped.

[0052] In the sheet 4 for a wire harness according to the fourth embodiment, no corners are formed between the R-shaped protrusions 20 S, and therefore the possibility of the sheet 4 for a wire harness being unintentionally torn at the corners is reduced.

[0053] The method of attaching the sheet for a wire harness 4 according to the fourth embodiment is the same as that shown in FIGS.

[0054] In this way, the sheet for wire harness 4 and the wire harness WH according to the fourth embodiment can provide the same effects as those of the third embodiment. That is, it is possible to provide the sheet for wire harness 3 capable of reducing loss even by punching, and the wire harness WH constituted by the sheet for wire harness 3. Also, by bonding the paired protrusions 20 together, stronger protection can be achieved and the ability to regulate the path can be increased.

[0055] Furthermore, according to the fourth embodiment, the space S between two adjacent protruding portions 20 and at least one of the plurality of protruding portions 20 are rounded and match each other. Therefore, no corner is formed in the space S between the protruding portions 20, and it is possible to reduce the possibility that the wire harness sheet 4 will be unintentionally torn from the corner.

[0056] The present invention has been described above based on an embodiment, but the present invention is not limited to the above embodiment, and modifications may be made without departing from the spirit of the present invention, and if possible, known or well-known technologies may be combined.

[0057] For example, in this embodiment, the multiple protrusions 20 protrude from both sides of the main body 10, but this is not limited thereto, and they may protrude from only one side. [Explanation of symbols]

[0058] 1~4: Wire harness sheets 10: Main body 20:Protrusion B: Branch O: Center position S: WH: Wire harness WH1: Wire harness body

Claims

1. A sheet for a wire harness that is attached to a branched portion where some electric wires are branched from a wire harness main body having a plurality of electric wires, A main body portion along a first direction; a plurality of protruding portions protruding laterally from the main body portion in a second direction intersecting the first direction and narrower than the length of the main body portion in the first direction; The main body portion is configured to be substantially symmetrical with respect to a straight line that passes through a center position of the main body portion and is perpendicular to the first direction, A space between two adjacent protrusions on the side of the main body and at least one of the plurality of protrusions are shaped to match each other. A sheet for a wire harness, comprising:

2. Between two adjacent protrusions and at least one of the plurality of protrusions, an R-shape is formed to match each other.

2. The sheet for a wire harness according to claim 1 .

3. The main body portion is configured to be substantially symmetrical with respect to a straight line that passes through the center position of the main body portion and is aligned along the first direction.

2. The sheet for a wire harness according to claim 1 .

4. A wire harness main body including a plurality of electric wires; The sheet for a wire harness according to claim 1 , which is attached to a branched portion at which a part of an electric wire is branched from the wire harness main body; A wire harness comprising:

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