Wire harness

Abstract

To provide a wire harness which can secure high waterproofness even under high temperature environment.SOLUTION: A wire harness 11 includes a first shield electric wire 12 and second shield electric wires 13 and 14. The wire harness 11 includes a core wire connection part 16 to which a first core wire 12a and second core wires 13a and 14a are connected, and a heat-shrinkable tube 34 coating the outer periphery of a part of outside insulation coatings 12d, 13d and 14d while coating the outer periphery of the core wire connection part 16, and includes a joint part where resins having compatibility are joined to each other inside of the heat-shrinkable tube 34, and thereby suppresses intrusion of a liquid to the inside of the heat-shrinkable tube 34.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a wire harness. [Background technology]

[0002] Conventionally, some wire harnesses have a connection part where the core wires of a plurality of electric wires are connected to each other (for example, see Patent Document 1). In this wire harness, the connection part is covered with a waterproof part made of a resin material, and the waterproof part is covered with a sheet body, thereby ensuring the waterproofness of the connection part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-34189 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to simplify the structure of the above-mentioned wire harness, it is possible to cover the connection parts with an exterior part such as a heat shrink tube and ensure waterproofing by using an adhesive on the inside of the exterior part. However, when an adhesive is used in this way, there is a risk that the adhesive will melt out of the exterior part in a high-temperature environment. Therefore, there is a risk that the waterproofing will be reduced. This, for example, causes limitations on the places where the wire harness can be installed.

[0005] An object of the present disclosure is to provide a wire harness that can ensure high waterproofing even in a high-temperature environment. [Means for solving the problem]

[0006] The wire harness of the present disclosure is a wire harness including a plurality of electric wires, each of which has a core wire and an outer insulating coating that covers the outer periphery of the core wire and constitutes the outermost layer of the electric wire, and the wire harness includes a core wire connection portion where the core wires are connected to each other, and an exterior portion that covers the outer periphery of the core wire connection portion and covers the outer periphery of part of the outer insulating coating, and a joint portion where compatible resins are joined inside the exterior portion, thereby suppressing the intrusion of liquid into the inside of the exterior portion. Effect of the Invention

[0007] According to the wire harness of the present disclosure, high waterproof performance can be ensured even in a high temperature environment. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a wire harness according to an embodiment. [Diagram 2] FIG. 2 is a partially enlarged cross-sectional view of the wire harness according to the embodiment. [Diagram 3] FIG. 3 is a partially enlarged cross-sectional view of the wire harness according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. [Diagram 5] FIG. 5 is a partially enlarged perspective view of a manufacturing process of the wire harness in one embodiment. [Figure 6] FIG. 6 is a plan view of a manufacturing process of the wire harness in one embodiment. [Figure 7] FIG. 7 is a plan view of a manufacturing process of the wire harness in one embodiment. [Figure 8] FIG. 8 is a plan view of a manufacturing process of the wire harness in one embodiment. [Figure 9] FIG. 9 is a plan view of the wire harness according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described. The wire harness of the present disclosure includes: [1] A wire harness having a plurality of electric wires, each of the electric wires having a core wire and an outer insulating coating that covers the outer circumference of the core wire and constitutes the outermost layer of the electric wire, the wire harness having a core wire connection portion where the core wires are connected to each other, and an exterior portion that covers the outer circumference of the core wire connection portion and covers the outer circumference of a part of the outer insulating coating, and a joint portion where compatible resins are joined together inside the exterior portion, thereby suppressing intrusion of liquid into the inside of the exterior portion.

[0010] According to this configuration, since the inside of the exterior part has a joint where resins having compatibility are joined together, the joint part is stable even in a high-temperature environment. That is, unlike a case where the inside of the exterior part is bonded with an adhesive, the adhesive does not melt in a high-temperature environment. Therefore, the infiltration of liquid into the inside of the exterior part is stably suppressed. Therefore, high waterproofing can be ensured even in a high-temperature environment.

[0011] [2] In the above [1], the resin constituting the outer insulating coating and the resin constituting the exterior portion may include resins that are compatible with each other, and the joint may include a first joint at which at least a portion of the outer peripheral surface of the outer insulating coating and the exterior portion are joined.

[0012] According to this configuration, the first joint portion stably prevents liquid from penetrating into the exterior portion from between at least a part of the outer circumferential surface of the outer insulating coating and the exterior portion. [3] In the above [1] or [2], a spacer portion may be provided that is interposed between two adjacent electric wires among the plurality of electric wires and disposed inside the exterior portion.

[0013] According to this configuration, the spacer portion fills the gap between two adjacent electric wires, thereby preventing liquid from penetrating into the exterior portion from between the two adjacent electric wires. [4] In the above [3], the resin constituting the exterior portion and the resin constituting the spacer portion may include resins that are compatible with each other, and the joint may include a second joint at which a part of the spacer portion and the exterior portion are joined.

[0014] According to this configuration, the second joint portion stably prevents liquid from penetrating into the inside of the exterior portion from between a part of the spacer portion and the exterior portion. [5] In the above [3] or [4], the resin constituting the outer insulating coating and the resin constituting the spacer portion may include resins that are compatible with each other, and the joint may include a third joint at which a part of the spacer portion and the outer insulating coating are joined.

[0015] According to this configuration, the third joint portion stably prevents liquid from penetrating into the inside of the exterior portion from between a part of the spacer portion and the outer insulating coating. [6] In any one of the above [1] to [5], the exterior part may be a heat shrink tube.

[0016] According to this configuration, when the heat shrink tube is heated, the compatible resins can be bonded to each other at the same time as the heat shrink tube is cured, which makes it easier to manufacture the wire harness. [7] In any one of the above [1] to [6], the electric wire may be a shielded electric wire having an insulating coating covering an outer periphery of the core wire, and a shielding member that covers the outer periphery of the insulating coating and is covered by the outer insulating coating.

[0017] According to this configuration, the radiation of electromagnetic waves from the core wire is suppressed. Also, the shielded electric wire is thicker than a non-shielded electric wire that does not have a shielding material. Therefore, the exterior part is also larger, but since the adhesive applied to the inside of the large exterior part is not necessary, the amount of adhesive used can be significantly reduced.

[0018] [Details of the embodiment of the present disclosure] Specific examples of the wire harness of the present disclosure will be described below with reference to the drawings. In each drawing, for convenience of explanation, some of the configuration may be exaggerated or simplified. In addition, the dimensional ratio of each part may differ in each drawing. In this specification, "parallel," "orthogonal," and "perfect circle" do not only mean strictly parallel, orthogonal, or perfect circle, but also include approximately parallel, orthogonal, or perfect circle within the range of the action and effect of this embodiment. Note that the present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0019] (Configuration of wire harness 11) 1, the wire harness 11 includes a first shielded electric wire 12 as an electric wire and a shielded electric wire, two second shielded electric wires 13 and 14 as electric wires and a shielded electric wire, and an underlay ring 15 (see FIGS. 2 and 3). The wire harness 11 also includes an inner heat shrink tube 21 as an insulating part, a shield connecting member 31, a crimping ring 32 (see FIG. 2), a bundling crimping ring 33 (see FIG. 3), a heat shrink tube 34 as an exterior part, and a spacer part 35.

[0020] (Configuration of the first shielded electric wire 12, the second shielded electric wires 13, 14 and the underlay ring 15) As shown in Fig. 2, the first shielded wire 12 has a first core wire 12a as a core wire and an insulating coating 12b covering the outer periphery of the first core wire 12a. The cross-sectional shape of the first core wire 12a is circular. The first shielded wire 12 also has a first shield member 12c as a shield member covering the outer periphery of the insulating coating 12b, and an outer insulating coating 12d covering the outer periphery of the first shield member 12c. The outer insulating coating 12d is formed to have a uniform thickness.

[0021] As shown in Fig. 3, the second shielded electric wires 13, 14 have second core wires 13a, 14a as core wires and insulating coatings 13b, 14b covering the outer periphery of the second core wires 13a, 14a. The cross-sectional shape of the second core wires 13a, 14a is circular. The second shielded electric wires 13, 14 also have second shield members 13c, 14c as shield members covering the outer periphery of the insulating coatings 13b, 14b, and outer insulating coatings 13d, 14d covering the outer periphery of the second shield members 13c, 14c. The outer insulating coatings 13d, 14d are formed to have a uniform thickness.

[0022] The first shielding member 12c and the second shielding members 13c, 14c suppress radiation of electromagnetic waves from the first core wire 12a and the second core wire 13a, 14a. The first shielding member 12c and the second shielding members 13c, 14c of this embodiment are braided wires in which conductive wires such as aluminum alloys are braided into a cylindrical shape. In the drawings, the shapes and appearances of the braided wires in the first shielding member 12c and the second shielding members 13c, 14c are appropriately and typically illustrated.

[0023] At the ends of the first shielded electric wire 12 and the second shielded electric wire 13, 14, the first core wire 12a and the second core wire 13a, 14a are provided so as to be exposed to the outside. At the ends of the first shielded electric wire 12 and the second shielded electric wire 13, 14, the first shield member 12c and the second shield member 13c, 14c are provided so as to be exposed to the outside. The first shield member 12c and the second shield member 13c, 14c have folded-back portions 12e, 13e, 14e that are folded back from the inside to the outside of the outer insulating coating 12d, 13d, 14d and arranged to cover the outer periphery of the outer insulating coating 12d, 13d, 14d. In other words, the first shield member 12c and the second shield member 13c, 14c are formed as folded-back portions 12e, 13e, 14e that are formed by folding back the parts exposed outside the outer insulating coating 12d, 13d, 14d.

[0024] First, the outer insulating coatings 12d, 13d, and 14d are stripped from the ends of the first shielded electric wire 12 and the second shielded electric wire 13 and 14. Next, the first shield member 12c and the second shield member 13c and 14c are folded back from the ends of the first shielded electric wire 12 and the second shielded electric wire 13 and 14, and then the insulating coatings 12b, 13b, and 14b are stripped from the ends of the first shielded electric wire 12 and the second shielded electric wire 13 and 14. As a result, the first shield member 12c and the second shield member 13c and 14c are exposed, folded-back portions 12e, 13e, and 14e are formed, and the first core wire 12a and the second core wire 13a and 14a are exposed.

[0025] The underlay ring 15 is made of metal and formed into a cylindrical shape. The underlay ring 15 is disposed between the outer insulating coatings 12d, 13d, 14d and the folded-back portions 12e, 13e, 14e. In other words, the underlay ring 15 is disposed on the outer periphery of the outer insulating coatings 12d, 13d, 14d when the first shielding member 12c and the second shielding members 13c, 14c are folded back.

[0026] As shown in FIG. 1, the first core wire 12a and the second core wires 13a and 14a are connected to each other to form a core wire connection section 16. In this embodiment, the first core wire 12a and the second core wires 13a and 14a are directly welded to each other. The first shielded electric wire 12 and the second shielded electric wires 13 and 14 extend in opposite directions from the core wire connection section 16. In detail, the first shielded electric wire 12 and the second shielded electric wires 13 and 14 extend in one direction (leftward in FIG. 1) and two second shielded electric wires 13 and 14 extend in the other direction (rightward in FIG. 1) from the core wire connection section 16. The wire harness 11 electrically connects, for example, a battery connected to the first core wire 12a and electric devices connected to the second core wires 13a and 14a.

[0027] (Configuration of the inner heat shrink tube 21) The internal heat shrink tube 21 covers the outer circumference of the core wire connection portion 16. The internal heat shrink tube 21 is formed in a cylindrical shape from an insulating resin material that shrinks when heated and hardens when cooled. The internal heat shrink tube 21 is heated and cooled to a shape that shrinks toward the inner member. The internal heat shrink tube 21 is provided so as to cover all of the first core wire 12a and the second core wires 13a and 14a exposed from the insulating coatings 12b, 13b and 14b. The internal heat shrink tube 21 is provided so as to cover the ends of the insulating coatings 12b, 13b and 14b as well.

[0028] (Configuration of shield connecting member 31, crimping ring 32, and bundling crimping ring 33) As shown in FIG. 1, the shield connection member 31 suppresses radiation of electromagnetic waves from between the first shield member 12c and the second shield members 13c, 14c. The shield connection member 31 is connected to the first shield member 12c and the second shield members 13c, 14c while covering the outer periphery of the internal heat shrinkable tube 21. The shield connection member 31 has flexibility. The shield connection member 31 of this embodiment is, for example, a braided wire in which conductive wires such as aluminum alloy are braided into a cylindrical shape. In the drawings, the shape and appearance of the braided wire in the shield connection member 31 are appropriately and typically illustrated. Specifically, in the drawings, the shield connection member 31 is illustrated in a sheet shape with the details of the braided wire omitted. The shield connection member 31 is arranged so as to continuously cover the range from the folded portion 12e of the first shield member 12c (see FIG. 2) to the folded portions 13e, 14e of the second shield members 13c, 14c (see FIG. 3).

[0029] 2, the crimping ring 32 is made of metal and formed into a cylindrical shape. The crimping ring 32 connects the folded-back portion 12e of the first shielding member 12c and the shield connecting member 31. More specifically, the crimping ring 32 is crimped from the outer periphery, thereby connecting the folded-back portion 12e of the first shielding member 12c and the shield connecting member 31 by tightening them from the outer periphery. The folded-back portion 12e and the shield connecting member 31 are sandwiched and connected between the underlay ring 15 and the crimping ring 32.

[0030] As shown in FIG. 3, the bundling crimping ring 33 is made of metal and formed into a cylindrical shape. The bundling crimping ring 33 connects the folded-back portions 13e, 14e of the second shielding members 13c, 14c to the shield connecting member 31. In detail, the bundling crimping ring 33 is crimped from the outer periphery to bundle the two second shielded electric wires 13, 14 and to connect the folded-back portions 13e, 14e of the two second shielding members 13c, 14c to the shield connecting member 31 by bundling them together. The folded-back portions 13e, 14e and the shield connecting member 31 are sandwiched and connected by the underlay ring 15 and the bundling crimping ring 33. As a result, in this embodiment, the shield connecting member 31 that covers the outer periphery of the internal heat shrink tube 21 and connects the first shielding member 12c and the second shielding members 13c, 14c to each other constitutes a shield connecting portion. In this state, the folded-back portions 13e, 14e of the two adjacent second shielded electric wires 13, 14 are in contact with each other, so that the outer insulating coatings 13d, 14d are entirely disposed apart from each other.

[0031] (Configuration of heat shrink tube 34) As shown in Fig. 1, the heat shrink tube 34 covers the outer periphery of the shield connecting member 31 and also covers the outer periphery of parts of the outer insulating coatings 12d, 13d, and 14d. The heat shrink tube 34 is formed in a cylindrical shape from an insulating resin material that shrinks when heated and hardens when cooled. The heat shrink tube 34 is heated and cooled to a shape that shrinks toward the inner member. The heat shrink tube 34 is provided so as to cover the entire shield connecting member 31. The heat shrink tube 34 is provided so as to cover parts of the outer insulating coatings 12d, 13d, and 14d that protrude from the shield connecting member 31 to the outside.

[0032] (Configuration of spacer portion 35) 3, the spacer portion 35 is disposed inside the heat shrink tube 34 while being interposed between two adjacent second shielded electric wires 13, 14. In other words, the spacer portion 35 is disposed so as to fill the space between the two adjacent second shielded electric wires 13, 14 inside the heat shrink tube 34. The spacer portion 35 is a portion provided between the outer insulating coatings 13d, 14d formed to a uniform thickness, and is joined to the outer insulating coatings 13d, 14d.

[0033] 4 and 5, the spacer portion 35 is formed to be able to come into surface contact with the outer peripheral surfaces 13f, 14f of the second shielded electric wires 13, 14. More specifically, before being joined to the outer insulating coatings 13d, 14d, the spacer portion 35 has arcuate surfaces 35a that conform to the outer peripheral surfaces 13f, 14f of the outer insulating coatings 13d, 14d of the second shielded electric wires 13, 14. The arcuate surfaces 35a are provided on both sides of the spacer portion 35 in correspondence with the opposing outer insulating coatings 13d, 14d.

[0034] 3, the spacer portion 35 is disposed so as not to protrude outward from the open end 34a of the heat shrink tube 34. The spacer portion 35 in this embodiment is disposed so that its end coincides with the open end 34a of the heat shrink tube 34.

[0035] The spacer portion 35 interposed between two adjacent second shielded electric wires 13, 14 is a single component because the two adjacent second shielded electric wires 13, 14 are entirely spaced apart from each other. That is, one spacer portion 35 is provided for each of the two adjacent second shielded electric wires 13, 14 before being joined to the outer insulating coatings 13d, 14d.

[0036] Here, the wire harness 11 of this embodiment has a joint where compatible resins are joined together inside the heat shrink tube 34, thereby preventing liquid from penetrating into the inside of the heat shrink tube 34.

[0037] Specifically, the resin constituting the outer insulating coatings 12d, 13d, 14d and the resin constituting the heat shrink tube 34 include resins that are compatible with each other. The joint portion includes first joint portions 41, 42 at which at least a part of the outer circumferential surfaces 12f, 13f, 14f of the outer insulating coatings 12d, 13d, 14d and the heat shrink tube 34 are joined.

[0038] Specifically, the outer insulating coatings 12d, 13d, and 14d are made of a resin containing cross-linked polyethylene. The outer insulating coatings 12d, 13d, and 14d in this embodiment are made of cross-linked polyethylene.

[0039] The heat shrink tube 34 is made of a resin containing cross-linked polyethylene. The heat shrink tube 34 in this embodiment is made of cross-linked polyethylene and modified polyolefin. As a result, the resin constituting the outer insulating coatings 12d, 13d, and 14d and the resin constituting the heat shrink tube 34 contain cross-linked polyethylene that is compatible with each other.

[0040] 2, the joint portion includes a first joint portion 41 at which the entire outer peripheral surface 12f of the outer insulating coating 12d of the first shielded electric wire 12 is joined to the heat shrink tube 34. The entire outer peripheral surface 12f of the outer insulating coating 12d of the first shielded electric wire 12 is joined to the heat shrink tube 34 by heat when the heat shrink tube 34 is shrunk and heated.

[0041] 3 and 4, the joint portion includes a first joint portion 42 in which a part of the outer peripheral surface 13f, 14f of the outer insulating coating 13d, 14d of the second shielded electric wire 13, 14 is joined to the heat shrink tube 34. The part of the outer peripheral surface 13f, 14f of the outer insulating coating 13d, 14d of the second shielded electric wire 13, 14 and the heat shrink tube 34 are joined by heat when the heat shrink tube 34 is heated to shrink the heat shrink tube 34. The part of the outer peripheral surface 13f, 14f of the outer insulating coating 13d, 14d joined to the heat shrink tube 34 is the outer peripheral surface 13f, 14f that does not face each other and is the outer peripheral surface 13f, 14f on which the spacer portion 35 is not arranged.

[0042] The resin constituting the heat shrink tube 34 and the resin constituting the spacer portion 35 include resins that are compatible with each other. The joint portion includes a second joint portion 43 where a part of the spacer portion 35 and the heat shrink tube 34 are joined.

[0043] Specifically, the spacer portion 35 is made of a resin containing cross-linked polyethylene. The spacer portion 35 in this embodiment is made of cross-linked polyethylene. As a result, the resin constituting the heat shrink tube 34 and the resin constituting the spacer portion 35 contain cross-linked polyethylene that is compatible with each other.

[0044] 4, the joint portion is a part of the spacer portion 35 and includes a second joint portion 43 where the heat shrink tube 34 is joined to upper and lower end faces 35b of a plane connecting the two arcuate faces 35a. The part of the spacer portion 35 and the heat shrink tube 34 are joined by heat when the heat shrink tube 34 is heated to shrink the heat shrink tube 34.

[0045] The resin constituting the outer insulating coatings 13d, 14d and the resin constituting the spacer portion 35 include resins that are mutually compatible. The joint portion includes a third joint portion 44 where a part of the spacer portion 35 and the outer insulating coatings 13d, 14d are joined to each other.

[0046] Specifically, the resin constituting the outer insulating coatings 13d and 14d and the resin constituting the spacer portion 35 contain cross-linked polyethylene which is mutually compatible. 4, the joints include third joints 44 which are parts of the spacer portion 35 and where the two arcuate surfaces 35a and the outer insulating coatings 13d, 14d are joined together. The part of the spacer portion 35 and the outer insulating coatings 13d, 14d are joined together by heat when the heat shrink tube 34 is heated to shrink the heat shrink tube 34.

[0047] Next, a manufacturing method and an operation of the wire harness 11 configured as above will be described. As shown in FIGS. 6 to 9, the method for manufacturing the wire harness 11 of the present embodiment includes a core wire connecting step, an inner insulation step, a shield connecting step, and an exterior portion arranging step.

[0048] First, as shown in FIG. 6, in the core wire connecting step, the first core wire 12a and the second core wires 13a, 14a of the first shielded electric wire 12 and the second shielded electric wires 13, 14 are connected to form a core wire connecting portion 16.

[0049] 7, in the internal insulation process, the outside of the core wire connection portion 16 is covered with an internal heat shrink tube 21. More specifically, in the internal insulation process, the unheated internal heat shrink tube 21a is placed on the outside of the core wire connection portion 16, and is heated and cooled, thereby covering the outside of the core wire connection portion 16 with the internal heat shrink tube 21.

[0050] Next, as shown in Fig. 8, in the shield connecting step, the shield connecting member 31 is connected to the folded-back portions 12e, 13e, and 14e (see Fig. 7) of the first shielding member 12c and the second shielding members 13c and 14c. In detail, in the shield connecting step, the shield connecting member 31 is connected to the folded-back portions 12e, 13e, and 14e (see Fig. 7) by the crimping ring 32 and the bundling crimping ring 33 while covering the outside of the internal heat shrinkable tube 21 with the shield connecting member 31.

[0051] In this state (see Figs. 5 and 8), a spacer portion 35 is disposed between the two adjacent second shielded electric wires 13, 14 outside the shield connecting member 31 and between the outer insulating coatings 13d, 14d.

[0052] 9, in the exterior arrangement step, the outside of the shield connecting member 31 is covered with a heat shrink tube 34. More specifically, in the exterior arrangement step, an unheated heat shrink tube 34b is arranged on the outside of the shield connecting member 31, and is heated and cooled, thereby covering the outside of the shield connecting member 31 with the heat shrink tube 34.

[0053] In addition, in the exterior part arranging step, resins having compatibility with each other are bonded together inside the heat shrink tube 34, thereby suppressing the infiltration of liquid into the inside of the heat shrink tube 34. In this embodiment, in the exterior part arranging step, in a state in which the spacer part 35 is arranged between the two second shielded electric wires 13, 14, the heat shrink tube 34b before heating is arranged outside the spacer part 35, and then heated and cooled. When the heat shrink tube 34 is heated in this manner, the heat is used to bond resins having compatibility with each other inside the heat shrink tube 34.

[0054] In this manner, the manufacture of the wire harness 11 is completed. In the wire harness 11 configured in this manner, the compatible resins are joined together at the inner portion of the open end 34a of the heat shrink tube 34, so that the infiltration of liquid into the inside of the heat shrink tube 34 is suppressed.

[0055] Next, the effects of the above embodiment will be described below. (1) Since the heat shrink tube 34 has a joint where resins having compatibility are joined together inside, the joint is stable even in a high-temperature environment. That is, unlike a case where the inside of the heat shrink tube 34 is bonded with an adhesive, the adhesive does not melt in a high-temperature environment. Therefore, the infiltration of liquid into the inside of the heat shrink tube 34 is stably suppressed. Therefore, high waterproofing can be ensured even in a high-temperature environment. In addition, since an adhesive or the like provided inside the heat shrink tube 34 is not necessary, the amount of material for the adhesive or the like can be reduced.

[0056] (2) The resin constituting the outer insulating coatings 12d, 13d, 14d and the resin constituting the heat shrink tube 34 include resins that are compatible with each other. The joint portion includes first joint portions 41, 42 at which at least a part of the outer peripheral surface 12f, 13f, 14f of the outer insulating coatings 12d, 13d, 14d is joined to the heat shrink tube 34. This stably suppresses the intrusion of liquid into the inside of the heat shrink tube 34 from between the heat shrink tube 34 and at least a part of the outer peripheral surface 12f, 13f, 14f of the outer insulating coatings 12d, 13d, 14d.

[0057] (3) The spacer portion 35 fills the gap between the two adjacent second shielded electric wires 13, 14, thereby preventing liquid from penetrating between the two adjacent second shielded electric wires 13, 14 into the inside of the heat shrink tube 34.

[0058] (4) The resin constituting the heat shrink tube 34 and the resin constituting the spacer portion 35 contain resins that are compatible with each other. The joint portion includes a second joint portion 43 at which a part of the spacer portion 35 and the heat shrink tube 34 are joined. This stably prevents liquid from penetrating between the part of the spacer portion 35 and the heat shrink tube 34 and into the inside of the heat shrink tube 34.

[0059] (5) The resin constituting the outer insulating coatings 13d, 14d and the resin constituting the spacer portion 35 contain resins that are compatible with each other. The joint portion includes a third joint portion 44 at which a part of the spacer portion 35 and the outer insulating coatings 13d, 14d are joined. This stably prevents liquid from penetrating into the inside of the heat shrink tube 34 from between the part of the spacer portion 35 and the outer insulating coatings 13d, 14d.

[0060] (6) Since the exterior portion is the heat shrink tube 34, the compatible resins can be bonded to each other at the same time as the heat shrink tube 34 is hardened when the heat shrink tube 34 is heated. This makes it easier to manufacture the wire harness 11.

[0061] (7) Since the electric wires are the first shielded electric wire 12 and the second shielded electric wire 13, 14 having the first shielding member 12c and the second shielding member 13c, 14c, radiation of electromagnetic waves from the first core wire 12a and the second core wire 13a, 14a is suppressed. In addition, the first shielded electric wire 12 and the second shielded electric wire 13, 14 are thicker than non-shielded electric wires that do not have the first shielding member 12c and the second shielding member 13c, 14c. Therefore, the heat shrink tube 34 also becomes larger, but since an adhesive provided inside the large heat shrink tube 34 is not necessary, the amount of adhesive used can be significantly reduced.

[0062] (8) Since the spacer portion 35 is arranged not to protrude from the open end 34a of the heat shrink tube 34 to the outside, the heat for bonding compatible resins is less likely to escape to any part other than the bonded portion.

[0063] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs. In the above embodiment, the outer insulating coatings 12d, 13d, and 14d are joined to the heat shrink tube 34, the spacer portion 35 is joined to the heat shrink tube 34, and the spacer portion 35 is joined to the outer insulating coatings 13d and 14d, but this is not limited to this. In other words, in the above embodiment, the joints include the first joints 41 and 42, the second joint 43, and the third joint 44, but this is not limited to this. In other words, as long as the infiltration of liquid into the inside of the heat shrink tube 34 is suppressed by providing a joint in which compatible resins are joined together inside the heat shrink tube 34, the configuration may be changed to a configuration other than that of the above embodiment.

[0064] In the above embodiment, the spacer portion 35 is disposed inside the heat shrink tube 34 and is interposed between two adjacent second shielded electric wires 13, 14. However, the present invention is not limited to this, and a configuration not including the spacer portion 35 may be used.

[0065] In the above embodiment, the exterior part is the heat shrink tube 34, but this is not limited thereto, and the exterior part may be changed to another part other than the heat shrink tube 34. In other words, as long as compatible resins are bonded together inside the exterior part to suppress the intrusion of liquid into the inside of the exterior part, the exterior part may be changed to another part other than the heat shrink tube 34.

[0066] In the above embodiment, the electric wire is the first shielded electric wire 12 and the second shielded electric wire 13, 14, but is not limited thereto, and the electric wire may not have the first shielding member 12c and the second shielding member 13c, 14c. For example, the electric wire may have a core wire and an outer insulating coating that covers the outer circumference of the core wire while being in contact with the outer circumference of the core wire and forms the outermost layer of the electric wire.

[0067] In the above embodiment, the spacer portion 35 is arranged so as not to protrude outward from the opening end 34a of the heat shrink tube 34, but this is not limited thereto, and the spacer portion 35 may be configured so as to protrude outward from the opening end 34a of the heat shrink tube 34.

[0068] In the above embodiment, the resin constituting the outer insulating coatings 12d, 13d, and 14d, the resin constituting the heat shrink tube 34, and the resin constituting the spacer portion 35 contain cross-linked polyethylene that is mutually compatible, but this is not limited to this. The resin constituting the outer insulating coatings 12d, 13d, and 14d, the resin constituting the heat shrink tube 34, and the resin constituting the spacer portion 35 may contain other resins that are mutually compatible.

[0069] In the above embodiment, when the heat shrink tube 34 is heated to be placed, the heat is used to bond compatible resins inside the heat shrink tube 34. However, this is not limited to this. For example, the resins may be bonded by separately heating the resins.

[0070] In the above embodiment, the two adjacent second shielded electric wires 13, 14 are arranged so as to be entirely separated from each other at the location where the spacer portion 35 is arranged, but this is not limiting and the outer circumferential surfaces 13f, 14f may be arranged so as to be in contact with each other. In this case, the spacer portion 35 is divided into two parts before being joined to the outer insulating coatings 13d, 14d.

[0071] In the above embodiment, the shield connecting member 31 constitutes the shield connecting portion, but this is not limited to the above. For example, the first shielding member 12c and the second shielding members 13c and 14c may be directly connected to each other, and the connection site may serve as the shield connecting portion.

[0072] In the above embodiment, the insulating part covering the outer periphery of the core wire connection part 16 is the internal heat shrink tube 21, but this is not limited to this and may be changed to another insulating part other than the internal heat shrink tube 21.

[0073] In the above embodiment, the first core wire 12a and the second core wires 13a, 14a are directly welded to each other, but this is not limited to the above. For example, the first core wire 12a and the second core wires 13a, 14a may be connected to each other using a separate member.

[0074] In the above embodiment, the wire harness 11 includes one first shielded electric wire 12 and two second shielded electric wires 13, 14. However, the present invention is not limited to this, and the number of the first shielded electric wires 12 and the number of the second shielded electric wires 13, 14 may be changed.

[0075] In the above embodiment, one spacer portion 35 before joining is provided for each of the two second shielded electric wires 13, 14, but if, for example, three shielded electric wires are lined up, a spacer portion 35 may be provided between each of the shielded electric wires, so that a total of two spacer portions 35 may be provided. In other words, if the number of lined up shielded electric wires is N, a configuration having a total of (N-1) spacer portions 35 may be used.

[0076] In the above embodiment, the first shielding member 12c and the second shielding members 13c, 14c are braided wires in which wires are woven into a tubular shape. However, the present invention is not limited to this. For example, the shielding members may be made of metal foil made of an aluminum alloy or the like.

[0077] In the above embodiment, the shield connecting member 31 is a braided wire in which element wires are woven into a cylindrical shape, but is not limited thereto, and may be, for example, a metal foil made of an aluminum alloy or the like. The shield connecting member 31 may be configured so as to be able to be disposed from the outside of the internal heat shrink tube 21. For example, the shield connecting member 31 may be a braided wire in which element wires are woven into a sheet shape, and may be disposed so as to cover the outer periphery of the internal heat shrink tube 21 by being wrapped around the internal heat shrink tube 21 from the outside of the internal heat shrink tube 21.

[0078] The technical ideas that can be understood from the above will be described below. (i) A method for manufacturing a wire harness including a plurality of electric wires, each of the electric wires having a core wire and an outer insulating coating covering an outer periphery of the core wire and constituting the outermost layer of the electric wire, the wire harness including a core wire connection portion where the core wires are connected to each other, and an exterior portion covering the outer periphery of the core wire connection portion and covering the outer periphery of part of the outer insulating coating, the method including an exterior portion arrangement step of joining compatible resins together inside the exterior portion to suppress liquid from penetrating inside the exterior portion.

[0079] According to this method, resins that are compatible with each other are bonded together inside the exterior part, so the bonded portion is stable even in a high-temperature environment. In other words, unlike when the inside of the exterior part is bonded with an adhesive, the adhesive does not melt in a high-temperature environment. Therefore, the infiltration of liquids into the inside of the exterior part is stably suppressed. Therefore, high waterproofing can be ensured even in a high-temperature environment.

[0080] (ii) The method for manufacturing a wire harness as described in (i) above, wherein the exterior portion is a heat shrink tube, and in the exterior portion arrangement process, a spacer portion is arranged between two adjacent electric wires among the plurality of electric wires, and the heat shrink tube before heating is arranged outside the spacer portion, and then heated and cooled.

[0081] According to this method, the resins having compatibility with each other can be bonded together at the same time as the heat shrink tube is heated, which makes manufacturing easier. In addition, the spacer fills the gap between two adjacent electric wires, which prevents liquid from penetrating into the exterior from between the two adjacent electric wires. [Explanation of symbols]

[0082] 11 Wire Harness 12 First shielded wire (wire and shielded wire) 12a 1st core wire (core wire) 12b Insulation coating 12c First shielding member (shielding member) 12d Outer insulation coating 12e Folded part 12f outer circumferential surface 13 Second shielded wire (wire and shielded wire) 13a 2nd core wire (core wire) 13b Insulation coating 13c Second shielding member (shielding member) 13d Outer insulation coating 13e Folded part 13f Outer surface 14 Second shielded wire (wire and shielded wire) 14a 2nd core wire (core wire) 14b Insulation coating 14c Second shield member (shield member) 14d Outer insulation coating 14e Folded part 14f Outer surface 15 Ring 16 Wire connection part 21 Inner heat shrink tube 21a Inner heat shrink tube before heating 31 Shield connecting member 32 Ring 33 Ring 34 Heat shrink tube (exterior part) 34a Open end 34b Heat shrink tube before heating 35 Spacer part 35a Circular surface 35b Upper and lower end surfaces 41 1st joint (joint) 42 1st joint (joint) 43 Second joint (joint) 44 Third joint (joint)

Claims

1. A wire harness including a plurality of electric wires, Each of the electric wires has a core wire and an outer insulating coating that covers an outer periphery of the core wire and constitutes an outermost layer of the electric wire, The wire harness includes a core wire connection portion at which the core wires are connected to each other, and an exterior portion that covers an outer periphery of the core wire connection portion and an outer periphery of a part of the outer insulating coating, The infiltration of liquid into the inside of the exterior part is suppressed by providing a joint in which resins having compatibility are joined together inside the exterior part. Wire harness.

2. a resin constituting the outer insulating coating and a resin constituting the exterior portion include resins that are compatible with each other, and the joint portion includes a first joint portion at which at least a part of an outer circumferential surface of the outer insulating coating and the exterior portion are joined. The wire harness according to claim 1 .

3. a spacer portion disposed inside the exterior portion and interposed between two adjacent electric wires among the plurality of electric wires, The wire harness according to claim 1 .

4. The resin constituting the exterior portion and the resin constituting the spacer portion include resins that are compatible with each other, and the joint portion includes a second joint portion at which a part of the spacer portion and the exterior portion are joined. The wire harness according to claim 3.

5. a resin constituting the outer insulating coating and a resin constituting the spacer portion include resins that are compatible with each other, and the joint portion includes a third joint portion at which a part of the spacer portion and the outer insulating coating are joined. The wire harness according to claim 3.

6. The exterior part is a heat shrink tube. The wire harness according to claim 1 .

7. The electric wire is a shielded electric wire having an insulating coating covering an outer periphery of the core wire, and a shielding member that covers an outer periphery of the insulating coating and is covered by the outer insulating coating. The wire harness according to claim 1 .

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