Electric wire with terminal

Abstract

To prevent a water cut-off agent from adhering to a fastening part of a terminal and suppress enlargement of the terminal, in an electric wire with a terminal in which the terminal is connected to an end of the electric wire and water cut-off treatment is applied to a connection part between the electric wire and the terminal.SOLUTION: The terminal-equipped electrical wire 1 includes an electrical wire 2, a terminal 3 connected to an end of the electrical wire 2, a water sealant 4 that seals a connection portion between the electrical wire 2 and the terminal 3, and a heat-shrink tube 5 that covers the connection portion. The terminal 3 includes a fastening portion 31, an electric wire placing portion 33 on which the electric wire 2 is placed, a core wire crimping portion 34 to which the core wire 21 of the electric wire 2 is crimped, and a connecting portion 32 connecting the fastening portion 31 and the electric wire placing portion 33. The wire placing portion 33 and the coupling portion 32 are continuous and flush with each other, and a boundary part 36 between the coupling portion 32 and the fastening portion 31 is bent. In the developed state of the terminal 3, the fastening portion 31, the coupling portion 32, and the electric wire placement portion 33 are connected in an L-shape.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a terminal-attached electric wire. [Background technology]

[0002] 6 is a diagram showing a conventional terminal-attached electric wire 501 constituting an automobile wiring harness. In this terminal-attached electric wire 501, a terminal 510 is connected to the end of an electric wire 540, and a waterproof treatment is applied to the connecting portion between the electric wire 540 and the terminal 510.

[0003] Terminal 510 is obtained by pressing a metal plate or the like, and includes fastening portion 515, electric wire placing portion 511, core wire crimping portion 512, and covering crimping portion 513.

[0004] The fastening portion 515 has a circular through-hole 515a and is formed in an annular shape. The fastening portion 515 is placed on a vehicle body panel and fastened to the vehicle body panel with bolts and nuts.

[0005] The electric wire placing portion 511 is a plate-like portion that is flush with and continuous with the fastening portion 515. An end of an electric wire 540 is placed on the electric wire placing portion 511. In addition, an insulating coating 542 is removed from the end of the electric wire 540, and a core wire 541 is exposed.

[0006] The core wire crimping portion 512 is composed of a pair of crimping pieces connected to both widthwise ends of the electric wire placing portion 511. The core wire crimping portion 512 crimps the core wire 541 of the electric wire 540 placed on the electric wire placing portion 511.

[0007] The sheath crimping portion 513 is composed of a pair of crimping pieces connected to both widthwise ends of the electric wire placing portion 511. The sheath crimping portion 513 crimps the portion of the electric wire 540 placed on the electric wire placing portion 511 that is covered with the insulating sheath 542.

[0008] After connecting terminal 510 to the end of electric wire 540, terminal-attached electric wire 501 is covered with heat-shrinkable tube 530 with waterproofing agent 520 on the inside thereof and heated, whereby melted waterproofing agent 520 permeates around electric wire 540 and between core wires 541, thereby performing waterproof treatment. Terminal-attached electric wire 501 thus treated with waterproofing prevents water (such as high-pressure cleaning water) from entering electric wire 540 from the terminal 510 side.

[0009] In the above-described terminal-attached electric wire 501, when waterproofing treatment is performed, the molten waterproofing agent 520 may penetrate into the through-hole 515a of the fastening portion 515 or may find its way around to the underside of the fastening portion 515 (the surface that comes into contact with the vehicle body panel). If the waterproofing agent 520 penetrates into the through-hole 515a and solidifies, there is a problem that this affects the insertion of the bolt. In addition, if the waterproofing agent 520 that has penetrated to the underside of the fastening portion 515 solidifies, there is a problem that the fastening portion 515 becomes lifted from the vehicle body panel.

[0010] In contrast, the above-mentioned problem is solved by the terminal-attached electric wire 601 shown in Fig. 7. In this terminal-attached electric wire 601, a terminal 610 is connected to the end of an electric wire 640, and a waterproof treatment is applied to the connecting portion between the electric wire 640 and the terminal 610 (see Patent Document 1).

[0011] Terminal 610 includes a fastening portion 615 having a through hole 615a, a wire mounting portion 611a, a core wire clamping portion 612, a coating clamping portion 613, an inclined portion 614 connected to fastening portion 615, and a flat portion 616 provided between inclined portion 614 and wire mounting portion 611a.

[0012] An end of an electric wire 640 is placed on the electric wire placing portion 611a. The core wire crimping portion 612 crimps a core wire 641 of the electric wire 640 placed on the electric wire placing portion 611a. The covering crimping portion 613 crimps a portion of the electric wire 640 placed on the electric wire placing portion 611a that is covered with the insulating covering 642.

[0013] The flat portion 616 is flush with and continuous with the electric wire placing portion 611a. The inclined portion 614 is inclined with respect to the flat portion 616 and the fastening portion 615. The flat portion 616 is located higher than the fastening portion 615. That is, the fastening portion 615, the inclined portion 614, and the flat portion 616 are formed in a crank shape.

[0014] As with the terminal-attached electric wire 501, the terminal-attached electric wire 601 is waterproofed by connecting the terminal 610 to the end of the electric wire 640, and then covering the connection portion with a heat-shrinkable tube 630 with a waterproofing agent 620 on the inside and heating it.

[0015] The terminal-attached electric wire 601 has an inclined portion 614 and a flat portion 616 between the fastening portion 615 and the electric wire placing portion 611a, creating a step, so that even if the waterproofing agent 620 flows out of the heat-shrinkable tube 630, it is unlikely to reach the fastening portion 615. [Prior art documents] [Patent documents]

[0016] [Patent Document 1] Japanese Patent Publication No. 2020-135964 Summary of the Invention [Problem to be solved by the invention]

[0017] Although the terminal-attached electric wire 601 of FIG. 7 described above prevents the waterproofing agent 620 from adhering to the fastening portion 615, a new problem has arisen in that the dimensions of the terminal 610 become longer in the longitudinal direction of the electric wire 640.

[0018] Therefore, the present invention aims to prevent a waterproofing agent from adhering to the fastening portion of the terminal in a terminal-attached electric wire in which a terminal is connected to the end of the electric wire and a waterproofing treatment is applied to the connection portion between the electric wire and the terminal, and to suppress an increase in the size of the terminal. [Means for solving the problem]

[0019] The present invention provides an electric wire with a terminal, comprising: an electric wire; a terminal connected to an end of the electric wire; a waterproofing agent that waterproofs the connection portion between the electric wire and the terminal; and a heat-shrinkable tube that covers the connection portion, wherein the terminal is formed from a single metal plate and comprises: a fastening portion with a circular through hole formed therein; an electric wire placing portion on which the electric wire is placed; a core wire crimping portion that is continuous with a widthwise end of the electric wire placing portion and crimps a core wire of the electric wire; and a connecting portion that connects the fastening portion and the electric wire placing portion, wherein the electric wire placing portion and the connecting portion are continuous and flush with each other, a boundary portion between the connecting portion and the fastening portion is bent, and when the terminal is in an unfolded state, the fastening portion, the connecting portion, and the electric wire placing portion are connected in an L-shape. [Effects of the Invention]

[0020] According to the present invention, in a terminal-attached electric wire, it is possible to prevent a waterproofing agent from adhering to a fastening portion of a terminal, and to suppress an increase in the size of the terminal. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram showing a terminal-attached electric wire according to an embodiment of the present invention. [Figure 2] FIG. 2 is a top view of the terminal-attached electric wire of FIG. 1. [Figure 3] FIG. 2 is a side view of the terminal-attached electric wire of FIG. 1. [Figure 4] FIG. 2 is a diagram showing the state of the terminal-attached electric wire of FIG. 1 before waterproofing treatment is performed. [Figure 5] 5 is a diagram showing a modified example of the terminal-attached electric wire of FIG. 4. [Figure 6] FIG. 1 is a diagram showing a conventional electric wire with a terminal. [Figure 7] FIG. 10 is a diagram showing another conventional terminal-attached electric wire. DETAILED DESCRIPTION OF THE INVENTION

[0022] A terminal-attached electric wire according to one embodiment of the present invention will be described with reference to FIGS.

[0023] 1 to 3 constitutes an automobile wiring harness. In the terminal-attached electric wire 1, a terminal 3 is connected to the end of an electric wire 2, and a waterproof treatment is applied to the connection portion between the electric wire 2 and the terminal 3 using a heat-shrinkable tube 5 and a waterproofing agent 4.

[0024] The electric wire 2 is a coated electric wire in which a core wire 21, which is a conductor, is coated with an insulating coating 22. At the end of the electric wire 2, the insulating coating 22 is removed and the core wire 21 is exposed.

[0025] The terminal 3 is obtained by pressing a single metal plate, etc. As shown in Fig. 4, the terminal 3 includes a fastening portion 31, a wire placing portion 33, a core wire crimping portion 34, a coating crimping portion 35, and a connecting portion 32.

[0026] The fastening portion 31 is formed in a plate shape and is a portion where a circular through hole 31a is formed. The fastening portion 31 is placed on a vehicle body panel and fastened to the vehicle body panel with a bolt and a nut (body grounded).

[0027] The wire placing portion 33 is a portion on which the end of the wire 2 is placed, and is formed in a plate shape extending in the longitudinal direction of the wire 2.

[0028] The core wire crimping portion 34 is composed of a pair of crimping pieces 34a connected to both widthwise ends of the electric wire placing portion 33. The core wire crimping portion 34 crimps the core wire 21 of the electric wire 2 placed on the electric wire placing portion 33 with the pair of crimping pieces 34a. Each crimping piece 34a is bent into a C shape with its tip facing the electric wire placing portion 33 side, and the core wire 21 is sandwiched between the electric wire placing portion 33 and the crimping piece 34a.

[0029] The cover crimping portion 35 is composed of a pair of crimping pieces 35a connected to both widthwise ends of the electric wire placing portion 33. The cover crimping portion 35 is located rearward of the core wire crimping portion 34 (on the side farther from the connecting portion 32). The cover crimping portion 35 crimps the portion of the electric wire 2 placed on the electric wire placing portion 33 that is covered with the insulating cover 22 using the pair of crimping pieces 35a. Each crimping piece 35a is bent into a C shape with its tip facing the electric wire placing portion 33, and clamps the electric wire 2 between itself and the electric wire placing portion 33.

[0030] In this specification, the side of the terminal 3 facing the electric wire 2 in the longitudinal direction of the electric wire 2 is referred to as the "rear" and the side away from the electric wire 2 is referred to as the "front." That is, the covering crimping portion 35 is located at the rear end of the terminal 3, and the connecting portion 32 and the fastening portion 31 are located at the front end of the terminal 3.

[0031] The connecting portion 32 is a portion that connects the fastening portion 31 and the electric wire placing portion 33. The electric wire placing portion 33 and the connecting portion 32 are continuous and flush with each other. A boundary portion 36 between the connecting portion 32 and the fastening portion 31 is bent at a right angle. The connecting portion 32 has an extension portion 32a located on an extension of the electric wire placing portion 33 and a protrusion portion 32b that protrudes laterally from a front portion of the extension portion 32a, and is formed in an L shape. In other words, the connecting portion 32 has the protrusion portion 32b that protrudes outward from one end portion of the electric wire placing portion 33 in the width direction and is connected to the fastening portion 31.

[0032] In addition, when the terminal 3 is in the unfolded state, the fastening portion 31, the connecting portion 32, and the wire placing portion 33 are connected in an L-shape.

[0033] After connecting the terminal 3 to the end of the electric wire 2, the terminal-attached electric wire 1 is waterproofed by covering the connection portion with a heat-shrinkable tube 5 with a waterproofing agent 4 on the inside and heating it.

[0034] The front end of the heat-shrinkable tube 5 abuts against the protruding portion 32b. Therefore, the front end of the heat-shrinkable tube 5 is located forward of the front end of the core wire 21. The rear end of the heat-shrinkable tube 5 is located rearward of the coating crimping portion 35. Note that if the front end of the heat-shrinkable tube 5 is located rearward of the front end of the core wire 21, and the core wire 21 is located outside the heat-shrinkable tube 5, the product is defective.

[0035] The waterproofing agent 4 is a hot melt adhesive. The waterproofing agent 4 is solid before being heated, and is integrated into the inner surface of the heat-shrinkable tube 5 in the form of a layer. The waterproofing agent 4 becomes liquid when heated, and penetrates around the electric wire 2, between the core wires 21, and between the insulating coating 22 and the core wire 21. The liquid waterproofing agent 4 solidifies as the temperature drops, and provides waterproofing around the electric wire 2, between the core wires 21, and between the insulating coating 22 and the core wire 21. In addition, when the heat-shrinkable tube 5 is heated and shrinks, the waterproofing agent 4 is forced out from the front end and rear end of the heat-shrinkable tube 5 and solidifies.

[0036] When the heat-shrinkable tube 5 is set on the terminal-attached electric wire 1, the front end of the heat-shrinkable tube 5 is abutted against the protruding portion 32b. In this way, the front end of the heat-shrinkable tube 5 is always positioned forward of the front end of the core wire 21, so there is no need to check whether the front end of the heat-shrinkable tube 5 exceeds the front end of the core wire 21.

[0037] When heating the heat-shrinkable tube 5, the wire placement section 33 is placed downward and the fastening section 31 is placed upward. In this way, the waterproofing agent 4 that leaks out from the front end of the heat-shrinkable tube 5 is retained at the connecting section 32, preventing it from reaching the fastening section 31. Furthermore, by checking that the waterproofing agent 4 is attached to the connecting section 32 after heating, it can be confirmed that the heat-shrinkable tube 5 has shrunk normally.

[0038] The terminal-attached electric wire 1 thus subjected to the waterproofing treatment is prevented from infiltrating water (such as high-pressure cleaning water) into the electric wire 2 from the terminal 3 side. Furthermore, in this terminal-attached electric wire 1, the dimension of the terminal 3 in the longitudinal direction of the electric wire is shorter than that of the terminal 610 shown in Fig. 7 .

[0039] Fig. 5 is a diagram showing a modified example of the terminal-attached electric wire 1 of Fig. 4. In the terminal-attached electric wire 101 of Fig. 5, a notch 37 is formed in the protruding portion 32b of the terminal 103. Although the heat-shrinkable tube is not shown in the terminal-attached electric wire 101 of Fig. 5, the same heat-shrinkable tube 5 as in Fig. 1 is used, and the front end of the heat-shrinkable tube 5 enters the notch 37. In other words, by forming the notch 37 in the protruding portion 32b, the front end of the heat-shrinkable tube 5 does not come into contact with the fastening portion 31, and more accurate positioning can be achieved.

[0040] In the above-described embodiment, the terminal 3 is provided with the cover crimping portion 35, but the cover crimping portion 35 may be provided as needed, and may be omitted if not needed.

[0041] The above-described embodiment merely shows a typical form of the present invention, and the present invention is not limited to this embodiment. In other words, the present invention can be implemented with various modifications within the scope of the gist of the present invention. As long as such modifications still include the configuration of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0042] 1,101 terminal-attached wires 2 electric wire 3,103 terminals 4. Waterproofing agent 5 Heat shrink tubing 31 Fastening part 32 Connecting part 33 Wire placement section 34 Wire clamping section

Claims

1. The device comprises an electric wire, a terminal connected to an end of the electric wire, a waterproofing agent that waterproofs a connection portion between the electric wire and the terminal, and a heat-shrinkable tube that covers the connection portion, The terminal is formed from a single metal plate, a fastening portion having a circular through hole formed therein; an electric wire placing section on which the electric wire is placed; a core wire crimping portion connected to an end portion in a width direction of the electric wire placing portion and crimping a core wire of the electric wire; a connecting portion connecting the fastening portion and the electric wire placing portion, The electric wire placement portion and the connecting portion are flush and continuous, a boundary portion between the connecting portion and the fastening portion is bent, In the deployed state of the terminal, the fastening portion, the connecting portion, and the wire placing portion are connected in an L-shape. A terminal-attached electric wire characterized by:

2. The connecting portion has a protruding portion that protrudes outward from one end portion in the width direction of the electric wire placing portion and is connected to the fastening portion. The terminal-attached electric wire according to claim 1 .

3. The end of the heat-shrinkable tube is abutted against the protrusion. The terminal-equipped electric wire according to claim 2 .

4. A notch is formed in the protruding portion, The end of the heat shrink tube is inserted into the notch. The terminal-equipped electric wire according to claim 2 .

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