WO2018168415A1

WO2018168415A1 - Cap-equipped wire

Info

Publication number: WO2018168415A1
Application number: PCT/JP2018/006944
Authority: WO
Inventors: 宏介蓮井; 須藤　博; 松藤　茂雄; 幸康坂本; 佑樹矢部
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2017-03-15
Filing date: 2018-02-26
Publication date: 2018-09-20
Also published as: JP2018153064A

Abstract

Provided is a technology which improves close adhesion between a wire after heat shrinkage and a heat-shrinking cap. A cap-equipped wire comprises a wire, a spacer attached around a covered section of the wire, and a heat-shrinking cap in which an adhesive agent containing a thermoplastic resin is provided to an inner surface, which is formed in a tube shape such that one end is closed off and the other end is open, and which is placed over an exposed core section of the wire and the spacer. When the heat-shrinking cap is in a heat-shrunk state, the radial dimension of the heat-shrinking cap in the section where the spacer is attached along the direction of extension of the wire is greater than the radial dimension of the heat-shrinking cap in the section where the spacer is not attached.

Description

Wire with cap

This invention relates to a technique for inserting an electric wire into a heat-shrink cap and bringing them into close contact.

In Patent Document 1, a hot-melt adhesive is provided on the inner wall of a heat-shrinkable tube, and one end is first heat-shrinked and sealed to form a heat-shrinkable cap. A method is disclosed in which the exposed core portion of the electric wire is sealed by heat shrinking the remaining portion of the cap. Similarly to Patent Document 1, Patent Document 2 discloses a method of sealing an exposed core portion of an electric wire using a heat shrink cap.

JP-A-11-178142 JP-A-11-233175

However, in the technologies described in Patent Documents 1 and 2, since the gap between the electric wire and the heat shrink cap is large before the heat shrink, the wire is inserted into the heat shrink cap or the heat shrink cap is heat shrunk. There is a possibility that the electric wire is eccentric with respect to the heat shrink cap when the heat shrink cap is used. Moreover, when it is eccentric in this way, the adhesive will flow non-uniformly around the wire during heat shrinkage, and the adhesion between the wire and the heat shrink cap after heat shrinkage will tend to be reduced.

Therefore, an object of the present invention is to provide a technique for improving the adhesion between an electric wire and a heat shrink cap after heat shrink.

In order to solve the above-mentioned problem, an electric wire with a cap according to a first aspect includes an electric wire, a spacer attached around a covering portion of the electric wire, and an adhesive containing a thermoplastic resin provided on an inner surface, and one end portion. A heat-shrinkable cap that is covered with the exposed core portion of the electric wire and the spacer, and the heat-shrinkable cap is heat-shrinked. In such a state, the radial dimension of the heat shrink cap in the portion where the spacer is attached along the extending direction of the electric wire is the radial dimension of the heat shrink cap in the portion where the spacer is not attached. Bigger than.

The electric wire with a cap according to the second aspect is an electric wire with a cap according to the first aspect, and the spacer has a cylindrical shape through which the electric wire can be inserted and connected to the entire circumferential direction.

The electric wire with a cap according to the third aspect is an electric wire with a cap according to the second aspect, and the spacer is provided along the circumferential direction of the outer peripheral surface at a position where the heat shrink cap is covered. It has at least one convex part.

The capped electric wire according to a fourth aspect is a capped electric wire according to the third aspect, wherein the at least one convex part is a plurality of convex parts, and the spacer is between adjacent convex parts. A groove is provided along the circumferential direction.

The electric wire with a cap according to a fifth aspect is an electric wire with a cap according to the first aspect, wherein the spacer is capable of inserting the electric wire inside thereof, and is partially axially in the axial direction. It is a substantially cylindrical shape having a slit extending along.

The electric wire with a cap according to a sixth aspect is an electric wire with a cap according to any one of the first to fifth aspects, wherein the one end of the heat-shrinkable cap is inside the heat-shrinkable cap that is heat-shrinked. The adhesive is filled in the region from the portion to the portion where the spacer is attached, and there is a gap in the region from the portion where the spacer is attached to the other end portion of the heat shrink cap.

According to the first to sixth aspects, in the state in which the heat shrink cap is heat shrunk, the radial dimension of the heat shrink cap in the portion where the spacer is attached along the extending direction of the electric wire is It is larger than the dimension in the radial direction of the heat shrinkable cap in the part that is not. By using a spacer that provides such dimensions, the posture of the electric wire in the heat shrink cap can be improved, and the eccentricity of the electric wire with respect to the heat shrink cap can be suppressed. For this reason, the adhesive easily flows around the electric wire during heat shrinkage, and the adhesion between the electric wire and the heat shrink cap after heat shrinkage is improved. Further, during heat shrinkage, the heat shrink cap is pressed more strongly against the portion where the spacer is attached and the radial dimension is larger than the portion where the spacer is not attached. As a result, adhesion through the spacer between the electric wire and the heat shrink cap after heat shrink is improved.

According to the second aspect, the spacer has a cylindrical shape through which an electric wire can be inserted and which is connected to the entire circumferential direction. By using such a spacer, the eccentricity of the electric wire with respect to the heat shrink cap can be effectively suppressed.

According to the third aspect, at the position where the heat shrink cap is put, at least one convex portion provided along the circumferential direction of the outer peripheral surface is provided. For this reason, the heat-shrinkable cap after heat-shrinking has a shape that follows the convex portion, and the heat-shrinkable cap is unlikely to come off from the electric wire and the spacer.

According to the fourth aspect, at least one convex portion is a plurality of convex portions, and the spacer has a groove along the circumferential direction between adjacent convex portions. By forming irregularities on the outer peripheral surface of the spacer in this way, the heat shrink cap is more difficult to come off from the electric wire and the spacer.

According to the fifth aspect, the spacer has a substantially cylindrical shape through which an electric wire can be inserted and which has a slit extending along the axial direction in a part of the circumferential direction. For this reason, an electric wire can be inserted in the inside of a spacer from this slit in the state before heat contraction. Further, the spacer can be deformed so as to change the interval of the slits along the circumferential direction according to the number and thickness of the electric wires inserted into the spacer. As a result, adhesion through the spacer between the electric wire and the heat shrink cap after heat shrink is improved.

According to the sixth aspect, in the heat-shrinkable heat-shrink cap, the region from one end of the heat-shrink cap to the portion to which the spacer is attached is filled with the adhesive, and heat is applied from the portion to which the spacer is attached. There is a gap in the region to the other end of the shrink cap. For this reason, an adhesive can be mainly filled into the part which needs adhesion (that is, one end side in the heat shrink cap where the exposed core part is disposed).

It is a perspective view which decomposes | disassembles and shows each component of the electric wire with a cap. It is sectional drawing which shows a heat contraction cap. It is a schematic sectional drawing which shows a mode that the electric wire with which the spacer was attached was inserted in the heat contraction cap. It is a schematic sectional drawing which shows an electric wire with a cap. It is a schematic sectional drawing which shows a mode that the electric wire with which the spacer was attached was inserted in the heat contraction cap. It is a schematic sectional drawing which shows an electric wire with a cap. It is a schematic sectional drawing which shows a mode that the electric wire with which the spacer was attached was inserted in the heat contraction cap. It is a schematic sectional drawing which shows an electric wire with a cap. It is a schematic perspective view which shows a spacer. It is a schematic perspective view which shows a spacer.

{Embodiment}
Hereinafter, the electric wire with a cap concerning an embodiment is explained. FIG. 1 is an exploded perspective view showing components of the electric wire 1 with a cap. FIG. 2 is a cross-sectional view showing the heat shrinkable cap 10.

The heat shrink cap 10 is put on the electric wire 40 and the spacer 60. The heat shrink cap 10 includes a cap main body 20 and an adhesive 30.

The cap main body 20 is formed in a closed tubular shape in which one end 21 is closed and the other end 22 is open. Moreover, after covering the electric wire 40 and the spacer 60, at least the other end part 22 of the cap main body part 20 can be thermally contracted. Specifically, here, the cap main body portion 20 includes an exterior portion 23 and a plug portion 28.

The exterior portion 23 is formed in a shape having a small diameter portion 24 and a large diameter portion 25 connected to the small diameter portion 24 from the one end portion 21 toward the other end portion 22 using a heat shrinkable tube having both ends opened as a material. At least the large-diameter portion 25 of the exterior portion 23 is in a state capable of being thermally contracted after being covered with the electric wire 40 and the spacer 60. That is, the large diameter portion 25 is in a state capable of being thermally contracted in a state where the heat shrink cap 10 is present alone.

Here, the exterior portion 23 is formed of a heat shrinkable tube having both ends open and a uniform diameter. As such a heat-shrinkable tube, a tube in which an adhesive layer is not previously provided on the inner surface is used.

Specifically, the exterior portion 23 is formed by thermally shrinking the one end portion 21 of the heat shrinkable tube so as to have a smaller diameter than the other end portion 22 to form the small diameter portion 24. For example, the exterior part 23 can be formed by heat-shrinking only the one end part 21 of the heat-shrinkable tube. In the following, an embodiment will be described in which the small diameter portion 24 is formed so that the heat shrinkage is completely completed and is not further heat shrunk. However, even if the small diameter portion 24 is formed so as to be heat shrinkable by subsequent heating. Good.

At this time, the large-diameter portion 25 includes a first large-diameter portion 26 that continues to the small-diameter portion 24 and gradually increases in diameter, and a second large-diameter portion 27 that continues to the first large-diameter portion 26 and is uniform in the axial direction. Have. The first large-diameter portion 26 is a portion that is not contracted as much as the small-diameter portion 24 but is thermally contracted by the transfer of heat when the small-diameter portion 24 is thermally contracted.

However, it is not essential to form the exterior portion 23 by thermally shrinking the one end portion 21 of the heat shrinkable tube to form the small diameter portion 24. For example, when manufacturing the heat-shrinkable tube by expanding the diameter of the tube material, the exterior portion 23 is expanded so that the other end portion 22 side has a larger diameter than the one end portion 21 side. And a shape having a large-diameter portion 25 may be used.

The plug portion 28 is a portion that is provided on the inner surface of the small diameter portion 24 and blocks the opening of the one end portion 21 of the exterior portion 23. Here, the plug portion 28 is formed of the same material as the adhesive 30. Here, the plug portion 28 is also provided when the adhesive 30 is provided on the cap body portion 20.

The adhesive 30 is a member that flows and fills the gap in the heat shrink cap 10 by heating for heat shrinking the heat shrink cap 10. For this reason, the adhesive 30 is comprised with the material (for example, hot-melt-adhesive) containing a thermoplastic resin.

Here, the adhesive 30 will be described as being retrofitted to the exterior portion 23 together with the plug portion 28 and heat shrinking one end portion 21 of the heat shrinkable tube to form a small diameter portion 24. For example, the adhesive 30 and the plug 28 are formed by applying a hot melt adhesive softened by heating to the inner surface of the exterior 23.

FIG. 3 is a schematic cross-sectional view showing a state where the electric wire 40 to which the spacer 60 is attached is inserted into the heat shrink cap 10. FIG. 4 is a schematic cross-sectional view showing the capped electric wire 1.

First, the spacer 60 is attached around the electric wire 40, and the integrated electric wire 40 and the spacer 60 are inserted into the heat shrink cap 10 from the opening of the other end 22 of the heat shrink cap 10 before shrinkage. FIG. 3 shows a cross-sectional view of each part at this point.

Here, in the example shown in FIG. 3, a plurality of covered electric wires 42 are assumed as the electric wires 40. Each covered electric wire 42 includes a core wire 43 and a covered portion 46 that covers the core wire 43.

The core wire 43 is formed of a conductive material such as copper, copper alloy, aluminum, or aluminum alloy. The core wire 43 is composed of one or more strands. Here, when there are a plurality of covered electric wires 42, the types of the core wires 43 of the respective covered electric wires 42 may be the same or different. Here, as the covered electric wire 42, a description will be given on the assumption that a copper electric wire in which the core wire 43 is formed of copper or a copper alloy and an aluminum electric wire in which the core wire 43 is formed of aluminum or an aluminum alloy coexist.

The covering portion 46 is formed by extruding an insulating material such as a resin around the core wire 43. The end portion of each covered electric wire 42 is an exposed core wire portion 44 in which the covered portion 46 is peeled off and the core wire 43 is exposed. At least a part of the exposed core wire portion 44 is formed with a joint portion 45 in which the core wires 43 are joined together. The core wires 43 are joined to each other by welding such as resistance welding or ultrasonic welding, terminal crimping, or soldering, for example.

A spacer 60 is attached around the covering portion 46 of the electric wire 40. The spacer 60 includes a cylindrical tube portion 61 and two convex portions 62 provided along the circumferential direction of the outer peripheral surface of the tube portion 61.

The two convex portions 62 are provided apart along the axial direction of the spacer 60. Therefore, a groove 63 is provided between two adjacent convex portions 62 along the circumferential direction of the outer peripheral surface of the cylindrical portion 61. Further, the two convex portions 62 have the same shape, and are tapered from the base end side (tube portion 61 side) toward the tip end side. Therefore, annular edge portions 620 are respectively formed at the tip portions of the two convex portions 62.

The spacer 60 is formed of a material (for example, a metal such as copper, a heat-resistant resin, a heat-resistant rubber, etc.) that does not deform even when the temperature becomes high during the heating process described later. Here, description will be made assuming that the above-described cylindrical portion 61 and the two convex portions 62 are integrally formed using a heat-resistant resin as a material, and the spacer 60 is formed.

The inner diameter of the spacer 60 is formed substantially the same as the outer diameter of the covering portion 46 of the electric wire 40. Specifically, the lower limit value of the inner diameter of the spacer 60 is a dimension that allows the covering portion 46 of the electric wire 40 to be inserted into the spacer 60. Further, the upper limit value of the inner diameter of the spacer 60 is a dimension that can be fixed to the inserted electric wire 40 and that the adhesive 30 does not overflow from between the electric wire 40 in the heating step described later. When the spacer 60 is configured to be elastically deformable, the upper limit value and the lower limit value are set in consideration of the elastic deformation amount.

When attaching the spacer 60 to the periphery of the electric wire 40, first, the tip end side of the electric wire 40 along the axial direction of the cylindrical portion 61 (the side where the joining portion 45 is provided and tapered) is inside the spacer 60. Inserted into. The electric wire 40 is moved relative to the spacer 60 along the axial direction until the spacer 60 is positioned around the covering portion 46 of the electric wire 40. At this timing, the plurality of covered electric wires 42 constituting the electric wires 40 are tightened by the spacers 60 and concentrated toward their central axes. As a result, the diameter dimension of the electric wire 40 becomes small and the relative movement becomes possible. Thereafter, in a state where the relative movement is stopped, the plurality of covered electric wires 42 constituting the electric wire 40 tries to return to a state in which the electric wires 40 are slightly dispersed. Thus, by the force of returning the plurality of covered electric wires 42 to the dispersed state, the outer peripheral surface of the covering portion 46 of the electric wire 40 and the inner peripheral surface of the spacer 60 are pressed against each other. It is fixed with respect to the part 46.

Thus, the heat shrink cap 10 is put on the electric wire 40 on which the spacer 60 is mounted. As a result, as shown in FIG. 3, the tip of the joint portion 45 is brought into contact with the plug portion 28 in the heat shrink cap 10, and the electric wire 40 is positioned with respect to the heat shrink cap 10 in the illustrated vertical direction. Hereinafter, this state is referred to as a wearing state. As a mode different from the present embodiment, the outer peripheral surface of the spacer 60 is in contact with the inner peripheral surface of the heat shrink cap 10 while the tip of the joint portion 45 is not in contact with the plug portion 28 in the heat shrink cap 10. As a result, the electric wire 40 may be positioned with respect to the heat shrink cap 10.

In this embodiment, in the mounted state, the electric wire 40 is indirectly supported on the inner wall of the heat shrink cap 10 via the spacer 60 provided around the electric wire 40. That is, the portion of the electric wire 40 to which the spacer 60 is attached is spaced a certain distance (ie, a distance based on the radial dimension of the spacer 60) from the inner wall of the heat shrink cap 10 in the entire circumferential direction. Are positioned as follows. Thus, the electric wire 40 is positioned by the tip of the joining portion 45 abutting against the plug portion 28 in the heat shrinkable cap 10 in the extending direction, and the spacer in the two directions orthogonal to the extending direction. Positioned by being supported on the inner wall of the heat shrink cap 10 via 60. Therefore, in the aspect of this embodiment, compared with the case where the spacer 60 is not provided and the electric wire 40 is directly supported by the inner wall of the heat shrink cap 10 (that is, the case where the distance is not provided), It is difficult for the electric wire 40 to be eccentric with respect to the cap 10. Further, even if the electric wire 40 is inclined with respect to the heat shrink cap 10, the inclination is suppressed by the presence of the spacer 60, and the covering portion 46 of the electric wire 40 contacts the edge portion of the other end portion 22 of the heat shrink cap 10. It is hard to do.

In the mounted state, at least one of the heat shrink cap 10 and the electric wire 40 may be held by a jig or the like (not shown).

When the heat shrink cap 10 and the electric wire 40 are positioned, the heat shrink cap 10 is heated by the heating mechanism 80. As a result, the large diameter portion 25 of the heat shrink cap 10 is contracted and the adhesive 30 flows. Then, the periphery of the exposed core portion 44 and the covering portion 46 is filled with the fluidized adhesive 30.

As shown in FIG. 3, in the mounted state before the heating step, the adhesive 30 is provided on the inner surface of the cap main body 20 along the axial direction from the first part P1 to the second part P2. It has been. Here, the 1st site | part P1 is a site | part which contacts the plug part 28 from inner side (illustration upper side). Moreover, the 2nd site | part P2 is a site | part by the side of the one end part 21 along the said axial direction rather than the site | part P3 in which the spacer 60 is provided in a mounting state. That is, in the mounted state, the adhesive 30 is not provided on the other end 22 side than the portion P3 where the spacer 60 is provided. Thereby, it is suppressed that the adhesive 30 which flows by a heating process overflows from the other end part 22 of the heat contraction cap 10. Further, in the mounted state, the part P3 where the spacer 60 is provided is located on the other end 22 side of the center position between the one end 21 and the other end 22, for example. The spacer 60 is formed such that the outer diameter of the edge portion 620, which is the portion having the largest radial dimension, is the same as or smaller than the inner diameter of the cap body portion 20 of the heat shrink cap 10.

When the heating is completed, the heat shrink cap 10 is sufficiently contracted, and the heat shrink cap 10 is in close contact with the electric wire 40 through the adhesive 30. Thereafter, the fluidized adhesive 30 is solidified by cooling, and the capped wire 1 shown in FIG. 4 is completed.

The capped electric wire 1 includes an electric wire 40, a spacer 60 attached around the covering portion 46 of the electric wire 40, and the heat shrink cap 10 covered on the exposed core portion 44 and the spacer 60 of the electric wire 40.

And in the electric wire 1 with a cap, the dimension of the radial direction of the heat contraction cap in the part 70 to which the spacer 60 was attached along the extending direction of the electric wire 40 in the state where the heat contraction cap 10 was thermally contracted. Is larger than the radial dimension of the heat shrinkable cap 10 in the part to which the heat shrink cap 10 is not attached (that is, the part 71 at the one end 21 and the part 72 at the other end 22 from the part 70).

By using the spacer 60 that provides such dimensions, as described above, the posture of the electric wire 40 in the heat shrink cap 10 can be improved, and the eccentricity of the electric wire 40 with respect to the heat shrink cap 10 can be suppressed.

If the spacer 60 is not provided (that is, when the eccentricity of the electric wire 40 with respect to the heat shrink cap 10 is large), the flow of the adhesive 30 in the heat shrink cap 10 becomes uneven during the heating process. Thereby, in the electric wire 1 with a cap, the location where the adhesive 30 passes and the location where the adhesive 30 does not exist exist around the electric wire 40, and the adhesiveness between the electric wire 40 and the heat shrink cap 10 after heat shrinkage decreases. To do.

In contrast, in the present embodiment, by providing the spacer 60, the portion of the electric wire 40 to which the spacer 60 is attached has a certain distance from the inner wall of the heat shrink cap 10 in the entire circumferential direction. Positioned to open. Thereby, the adhesive 30 tends to flow uniformly around the electric wire 40 at the time of heat shrinkage, and the adhesion between the electric wire 40 and the heat shrink cap 10 after heat shrinkage is improved. As a result, the water stoppage of the electric wire 1 with a cap is improved. In addition, the adhesive 30 uniformly flows around the electric wire 40 during heat shrinkage, so that the exposed core wire portion 44 is prevented from breaking through the heat shrink cap 10.

In the heat shrinkage, the heat shrink cap 10 is pressed more strongly than the

portions

71 and 72 where the spacer 60 is not attached to the portion 70 where the spacer 60 is attached and the radial dimension is large. As a result, the adhesiveness of the electric wire 40 and the heat shrink cap 10 after the heat shrink via the spacer 60 is improved.

Furthermore, in the present embodiment, the spacer 60 has a cylindrical shape in which the electric wire 40 can be inserted and connected to the entire circumferential direction. By using such a spacer 60, the eccentricity of the electric wire 40 with respect to the heat shrink cap 10 can be effectively suppressed.

In the present embodiment, the spacer 60 has two convex portions 62 provided along the circumferential direction of the outer peripheral surface at a position where the heat shrink cap 10 is put. Therefore, the heat-shrinkable cap 10 after heat-shrinking has a shape that follows the two convex portions 62, and the heat-shrinkable cap 10 is unlikely to be detached from the electric wire 40 and the spacer 60. Unlike the aspect of the present embodiment, the number of convex portions 62 may be one or three or more. If the spacer 60 has at least one protrusion 62, the same effect can be obtained.

Further, in the present embodiment, the spacer 60 has two convex portions 62, and the spacer 60 has a groove 63 along the circumferential direction between the adjacent convex portions 62. By forming irregularities on the outer peripheral surface of the spacer 60 in this manner, the heat shrink cap 10 is further less likely to be detached from the electric wire 40 and the spacer 60. Furthermore, the hot melt adhesive similar to the adhesive 30 may be filled in the groove 63 in the stage before the heating process. In this case, the adhesive filled in the groove 63 contributes to the adhesion between the heat shrink cap 10 and the spacer 60 in the heating step, like the adhesive 30. Unlike the aspect of the present embodiment, the number of the convex portions 62 may be three. If the spacer 60 has a plurality of convex portions 62, a groove 63 is formed between the adjacent convex portions 62, and the same effect is obtained.

In this embodiment, the spacer 60 is located inside the heat-shrinkable cap 10 that has been heat-shrinked. Then, in the heat shrink cap 10, a region 710 from one end 21 of the heat shrink cap 10 to the portion 70 to which the spacer 60 is attached is filled with the adhesive 30, and from the portion 70 to which the spacer 60 is attached. There is a gap in the region 720 to the other end 22 of the heat shrink cap 10. Therefore, the adhesive 30 can be mainly filled in a portion that needs to be bonded (that is, the one end portion 21 side in the heat shrink cap heat shrink cap 10 where the exposed core portion 44 is disposed).

{Modifications}
Below, the modification of the said embodiment is demonstrated. In addition, about the common point with each part in the said embodiment, the same code | symbol is attached | subjected and repeated description is avoided.

First, with reference to FIG. 5 and FIG. 6, the modification about the electric wire with a cap is demonstrated. FIG. 5 is a schematic cross-sectional view showing a state where the electric wire 40 to which the spacer 60a is attached is inserted into the heat shrink cap 10a. FIG. 6 is a schematic cross-sectional view showing the capped electric wire 1a.

5 and 6, the heat-shrinkable cap 10a before the heating step has a cap body part 20 and an adhesive 30a provided on the inner surface of the cap body part 20. This adhesive 30a is a hot-melt adhesive similar to the adhesive 30, and in the mounted state before the heating step, from the first part P1 to the second part along the axial direction on the inner surface of the cap body part 20. It is provided in the part up to P2a. Here, the second part P2a is a part corresponding to the other end 22. That is, the second part P2a is a part on the other end 22 side along the axial direction than the part P3 where the spacer 60 is provided in the mounted state.

The spacer 60a has a cylindrical tube portion 61a and two convex portions 62a provided along the circumferential direction of the outer peripheral surface of the tube portion 61a. The two convex portions 62 a are provided to be separated along the axial direction of the spacer 60. Therefore, a groove 63 is provided between two adjacent convex portions 62 a along the circumferential direction of the outer peripheral surface of the cylindrical portion 61. The two convex portions 62a have the same shape, and are tapered from the proximal end side where the cylindrical portion 61a is provided toward the distal end side. Therefore, annular edge portions 620a are respectively formed at the tip portions of the two convex portions 62a.

And, the inner diameter of the spacer 60a (that is, the inner diameter of the cylinder portion 61a) is the same as or larger than the outer diameter of the covering portion 46 of the electric wire 40, as in the above embodiment. On the other hand, the spacer 60a is an adhesive in which the outer diameter of the edge portion 620a, which is the portion having the largest radial dimension, is provided in the cap main body portion 20 of the heat shrinkable cap 10a at the portion P3 where the spacer 60 is provided in the mounted state. It is formed to be equal to or smaller than the inner diameter of 30a.

Therefore, in the electric wire with cap 1a obtained through the heating process, in the heat-shrinkable heat-shrinkable cap 10a, the region 710a from the one end portion 21 of the heat-shrinkable cap 10a to the portion 70a to which the spacer 60a is attached, and the spacer Both the region 720a from the attached portion 70a of 60a to the other end 22 of the heat shrink cap 10a is filled with the adhesive 30. As a result, the adhesion between the heat shrink cap 10 and the electric wire 40 via the adhesive 30 is improved.

Next, with reference to FIG. 7 and FIG. 8, another modification example of the electric wire with a cap will be described. FIG. 7 is a schematic cross-sectional view showing a state where the electric wire 40 to which the spacer 60 is attached is inserted into the heat shrink cap 10b. FIG. 8 is a schematic cross-sectional view showing the capped electric wire 1b.

7 and 8, the heat-shrinkable cap 10b before the heating step has a cap main body portion 20b and an adhesive 30 provided on the inner surface of the cap main body portion 20. In the cap body portion 20b, the other end portion 22b is positioned in the section P3 where the spacer 60 is provided in the mounted state along the axial direction.

Therefore, in the capped wire 1b obtained through the heating process, the region 710 from the one end portion 21 of the heat shrink cap 10b to the portion 70 to which the spacer 60 is attached is an adhesive within the heat shrink cap 10b that has been heat shrunk. Filled with 30. In the present modification, the other end 22b of the heat shrink cap 10b is located on the outer peripheral surface of the portion 70 to which the spacer 60 is attached.

Next, a modified example of the spacer will be described with reference to FIG. FIG. 9 is a schematic perspective view showing the spacer 60c.

9 may be used instead of the spacer 60 of the above embodiment. The spacer 60c has a cylindrical shape through which the electric wire 40 can be inserted and is connected to the entire circumferential direction. Therefore, the eccentricity of the electric wire 40 with respect to the heat shrink cap 10 can be effectively suppressed as in the above embodiment. In the above-described embodiment, the aspect in which the spacer 60 has the convex portion 62 and the groove 63 on the outer peripheral surface thereof has been described, but the aspect in which the convex portion 62 and the groove 63 are not provided on the outer peripheral surface like the spacer 60c (that is, The outer peripheral surface of the spacer may be flat).

Next, another modified example of the spacer will be described with reference to FIG. FIG. 10 is a schematic perspective view showing the spacer 60d.

Instead of the spacer 60 in the above embodiment, a spacer 60d shown in FIG. 10 may be used. The spacer 60d has a substantially cylindrical shape in which the electric wire 40 can be inserted, and a slit 62d extending along the axial direction in a part of the circumferential direction. Therefore, the electric wire 40 can be inserted into the spacer 60d from the slit 62d in a state before heat shrinkage. Further, the spacer 60d is deformed so as to change the interval of the slits 62d along the circumferential direction (that is, to increase or decrease the diameter) in accordance with the number and thickness of the electric wires 40 inserted into the spacer 60d. Is possible. As a result, the adhesion through the spacer 60d between the electric wire 40 and the heat shrink cap 10 after heat shrink is improved.

Hereinafter, other modified examples will be described. In the above embodiment, the cap main body 20 has been described as being formed by closing the one end 21 of the exterior part 23 made of the heat-shrinkable tube at both ends with a plug 28 made of a different material. Not a required configuration. The cap body portion may be formed in a closed tube whose one end portion is closed from the beginning by a heat shrinkable material, or one end portion 21 of the exterior portion 23 formed of a heat shrinkable tube having both ends opened by welding or the like. It may be formed by being closed.

In the above embodiment, the heat shrinkable tube for forming the exterior portion 23 has been described as being used without an adhesive layer provided on the inner surface in advance, but this is an essential configuration. Absent. As the heat-shrinkable tube for forming the exterior portion 23, a tube having an adhesive layer provided on the inner surface in advance may be used. In this case, the adhesive 30 may be formed by the adhesive layer, or may be formed by stacking another material on the adhesive layer. The same applies to the plug portion 28.

In the above embodiment, the electric wire 40 is described as an assembly of a plurality of covered electric wires 42, but this is not an essential configuration. For example, the electric wire 40 may be a single covered electric wire 42.

In addition, each structure demonstrated in the said embodiment and each modification can be suitably combined unless it mutually contradicts.

Although the present invention has been described in detail as described above, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Electric wire with a cap 10 Heat-shrink cap 20 Cap body part 21 One end part 22 Other end part 30 Adhesive 40 Electric wire 44 Exposed core part 46 Covering part 60 Spacer 61 Tube part 62 Convex part 63 Groove

Claims

Electric wires,
A spacer attached around the coated portion of the wire;
An adhesive containing a thermoplastic resin is provided on the inner surface, and is formed in a closed tube with one end closed and the other end open, and the heat applied to the exposed core portion of the wire and the spacer Shrink cap,
With
In the state where the heat shrink cap is heat shrunk, the radial dimension of the heat shrink cap in the portion where the spacer is attached along the extending direction of the electric wire is the same as that in the portion where the spacer is not attached. Wire with cap that is larger than the radial dimension of the heat shrink cap.
The electric wire with a cap according to claim 1,
The spacer is an electric wire with a cap that has a cylindrical shape in which the electric wire can be inserted therein and is connected to the entire circumferential direction.
It is an electric wire with a cap according to claim 2,
The said spacer is an electric wire with a cap which has at least 1 convex part provided along the circumferential direction of the outer peripheral surface in the position where the said heat contraction cap is covered.
It is an electric wire with a cap according to claim 3,
The at least one convex portion is a plurality of convex portions,
The spacer is a capped electric wire having a groove along the circumferential direction between adjacent convex portions.
The electric wire with a cap according to claim 1,
The spacer is an electric wire with a cap that has a substantially cylindrical shape in which the electric wire can be inserted therein and has a slit extending along the axial direction in a part of the circumferential direction.
A wire with a cap according to any one of claims 1 to 5,
In the heat-shrinkable cap, the region from the one end portion of the heat-shrinkable cap to the portion where the spacer is attached is filled with the adhesive, and the region where the spacer is attached An electric wire with a cap in which there is a gap in the region to the other end of the shrink cap.