JP6112028B2 - Electric wire with resin molded terminal - Google Patents

Description

  The present invention relates to a resin-molded terminal-equipped electric wire having a terminal-equipped electric wire and a molded resin portion formed by insert molding.

  An electric wire with a terminal mounted on a vehicle such as an automobile may be required to be waterproof at a portion where the end of the electric wire and the terminal are connected. In this case, for example, a mold resin portion that is a resin molding portion that seals a water stop region extending from a connection portion of the terminal with the electric wire to a portion of the insulating coating of the electric wire is provided. The mold resin part is also referred to as a mold connector.

  The mold resin portion is a synthetic resin member that is insert-molded with the water stop region of the terminal-attached electric wire as an insert portion. And a mold resin part is inserted in the frame part of the housing | casing which accommodates the apparatus used as the other party of the electric wire with a terminal. Thereby, a mold resin part fills up the crevice between an electric wire with a terminal, and a case.

  The mold resin portion prevents the liquid from entering the connecting portion between the electric wire and the terminal, and further prevents the liquid from entering the housing from the gap between the terminal-attached electric wire and the frame portion of the housing that houses the device. In the following description, a terminal-attached electric wire in which a mold resin portion is formed by insert molding is referred to as a resin-formed terminal-attached electric wire.

JP 2003-178823 A

  The mold resin part formed in the electric wire with terminal is also an electric wire holding member that holds the electric wire with terminal in a fixed position in a state of being fitted into the frame part of the housing. Therefore, the mold resin portion needs to be a member having a hardness necessary for holding the electric wire with terminal.

  By the way, the electric wire with a resin molded terminal may be used under severe bending conditions such as the electric wire is frequently bent due to vibration or the like, or the electric wire is bent with a large curvature. In this case, the insulation coating of the electric wire is likely to be damaged by stress concentration at the portion of the hard mold resin portion that contacts the inner edge portion at one end.

  For example, in the case of an electric wire with a terminal, there is a concern that the electric wire may be damaged when a softer and thinner insulating coating is employed to cope with severe bending conditions.

  On the other hand, when the mold resin portion has a soft synthetic resin portion that forms an inner edge portion in contact with the insulating coating of the electric wire and other hard synthetic resin portions, stress concentration is unlikely to occur in the insulating coating of the electric wire. However, it is desirable that the mold resin portion can be molded more simply than by molding two types of synthetic resins by so-called two-color molding.

  An object of this invention is to provide the electric wire with a resin molding terminal which can shape | mold easily the mold resin part which can avoid the stress concentration to an electric wire, having the hardness required for holding | maintenance of the electric wire with a terminal.

  The electric wire with a resin molded terminal according to the first aspect includes an electric wire with terminal and a mold resin portion. The said electric wire with a terminal has the terminal connected to the edge part of the insulated wire and the core wire of the said insulated wire. The mold resin part is a member formed by insert molding using a part of the terminal-attached electric wire as an insert part. The mold resin portion has a base portion and a plurality of flexible branch portions. The base includes a portion that covers a connection portion between the core wire and the terminal in the electric wire with terminal. The plurality of branch portions are formed so as to branch from the base portion along the surface of the insulation coating of the insulated wire and arranged at intervals in the circumferential direction of the insulation coating.

  The electric wire with a resin molded terminal according to the second aspect is an aspect of the electric wire with a resin molded terminal according to the first aspect. In the electric wire with a resin molded terminal according to the second aspect, each of the branch portions of the mold resin portion includes a transverse thin portion that is formed across the branch portion and has a smaller thickness than an adjacent portion.

  The electric wire with a resin molded terminal according to the third aspect is an aspect of the electric wire with a resin molded terminal according to the first aspect or the second aspect. In the electric wire with a resin molded terminal according to the third aspect, each of the branch portions of the mold resin portion is formed to have a tapered width from the base portion side connected to the base portion to the tip portion side opposite thereto.

  In each of the above aspects, the plurality of branch portions in the mold resin portion are formed so as to branch from the base portion along the surface of the insulation coating in the insulated wire and arranged at intervals in the circumferential direction of the insulation coating.

  According to each aspect described above, the hard base portion and the plurality of flexible branch portions can be integrally formed by a single insert molding using the same synthetic resin material.

  For example, when the base is formed in a single block with a relatively large thickness, the hardness of the base necessary for holding the terminal-attached electric wire can be secured.

  On the other hand, each of the branch portions along the surface of the insulating coating is formed in a thin shape along the longitudinal direction of the insulated wire, so that a branch portion that can easily bend following the bending deformation of the insulated wire can be formed. If each of the branch portions bends following the bending of the insulated wire, it is possible to avoid stress concentration on the insulating coating in the insulated wire.

  Therefore, according to each aspect described above, there is provided a resin-molded terminal-attached electric wire that can easily mold a molded resin portion that can avoid stress concentration on the insulation coating of the insulated electric wire while having the hardness necessary for holding the electric wire with terminal. It becomes possible to provide.

  Further, in the second aspect, each of the branch portions is easily bent at the transverse thin portion having a thickness smaller than that of the adjacent portion. Thereby, the branch part which can be bent more easily can be shape | molded using the same material as a hard base.

  Further, in the third aspect, each of the branch portions has a width that tapers from the base portion side continuous to the base portion to the opposite tip portion side. In this case, the branch part is more easily bent at the tip side than at the root part.

  Therefore, the insulated wire whose outer surface is supported by the branch portion gradually deforms greatly from a portion fixed by the base portion to a portion further away from it when receiving an external force in the bending direction. Thereby, the stress applied to the insulation coating of the insulated wire from the branch portion is dispersed over a wide range from the root portion to the tip portion of the branch portion. As a result, stress concentration on the insulating coating of the insulated wire can be avoided more reliably.

It is a side view of the electric wire 1 with a resin molding terminal which concerns on 1st Embodiment. It is a top view of the electric wire 1 with a resin molding terminal. It is a side view of an electric wire with a terminal. It is a top view of an electric wire with a terminal. It is a side view of 1A of electric wires with a resin molding terminal concerning a 2nd embodiment. It is a top view of 1A of electric wires with a resin molding terminal.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention. The electric wire with a resin molded terminal according to each embodiment shown below is a wire harness mounted on a vehicle such as an automobile or a component thereof.

<First Embodiment>
First, the electric wire 1 with a resin molded terminal according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the electric wire 1 with a resin molded terminal includes an electric wire 200 with a terminal and a molded resin portion 4.

  As shown in FIGS. 3 and 4, the terminal-attached electric wire 200 includes the insulated wire 2 and the terminal 3 connected to the end of the insulated wire 2. The insulated wire 2 includes a core wire 21 that is a linear conductor and an insulating coating 22 that covers the periphery of the core wire 21. The core wire 21 is a metal wire whose main component is, for example, copper or aluminum. The insulating coating 22 is a synthetic resin coating such as polyvinyl chloride, polyethylene, or silicon-based resin.

  The terminal 3 is connected to the end of the core wire 21 in the insulated wire 2. The terminal 3 is made of a plate material having, for example, a metal base material mainly composed of copper and a metal plating such as tin formed on the surface thereof.

  The terminal 3 includes a contact portion 31 that can be connected to a connection destination of the terminal-attached electric wire 200, and a core wire connection portion 32 that is connected to the core wire 21. In the example shown in FIGS. 1 to 4, the contact portion 31 is a flat plate portion having a through hole 310 through which a fixing member such as a screw is passed.

  1 to 4, the end portion of the core wire 21 is connected to the core wire connection portion 32 of the terminal 3 by welding such as ultrasonic welding. However, it is also conceivable that the core wire connection portion 32 of the terminal 3 is crimped to the end portion of the core wire 21.

  In the following description, a portion of the terminal-attached electric wire 200 where the core wire 21 and the core wire connecting portion 32 are connected is referred to as a core wire-terminal connecting portion 201. In addition, although the terminal 3 in this embodiment is a flat terminal, it is also considered that the terminal 3 is comprised with the board | plate material in which the bending process was performed.

  The mold resin part 4 is a member formed by insert molding using a part of the terminal-attached electric wire 200 as an insert part. The mold resin portion 4 includes a base portion 41 and a plurality of branch portions 42 each having flexibility.

  The mold resin portion 4 is a molded member made of a synthetic resin such as polypropylene, polyethylene, polyvinyl chloride, polyethylene terephthalate, or polyamide. The material of the base part 41 and the material of each branch part 42 are the same.

  The base 41 is a hard part by being a lump shape covering the core wire-terminal connection part 201. On the other hand, each of the branch portions 42 is a portion having flexibility by being branched from the base portion 41 and formed thinner than the base portion 41.

  In FIG. 1, an insulated wire 2 that bends when an external force is applied, and a branching portion 42 that bends following the bending deformation of the insulated wire 2 are depicted by virtual lines (two-dot chain lines).

  The base 41 includes a portion that covers the core wire-terminal connection portion 201 in the terminal-attached electric wire 200. The base portion 41 is a portion from the end of the terminal 3 on the contact portion 31 side to the intermediate position in the mold resin portion 4. More specifically, the base portion 41 is formed from the portion between the contact portion 31 and the core wire connecting portion 32 in the terminal-attached electric wire 200 to the end portion of the insulating coating 22.

  In the present embodiment, the base 41 collectively covers all the core wire-terminal connection portions 201 in the plurality of terminal-attached electric wires 200 arranged in parallel at intervals. The mold resin portion 4 is formed at both ends or one end of the plurality of terminal-attached electric wires 200 arranged in parallel.

  The base portion 41 is a portion that can be fitted into a frame portion of a housing that houses a device to which the terminal 3 is connected. The base portion 41 is fitted into the frame portion of the housing, thereby filling a gap between the terminal-attached electric wire 200 and the housing.

  On the other hand, the plurality of branch portions 42 are formed by branching from the base portion 41. Each of the branch portions 42 is a portion from an end opposite to the contact portion 31 side of the terminal 3 in the mold resin portion 4 to an intermediate position.

  Each of the branch portions 42 is formed in a state along the surface of the insulating coating 22 and at intervals in the circumferential direction of the insulating coating 22. That is, for each insulated wire 2, a plurality of branch portions 42 are formed along the outer peripheral surface of the insulating coating 22 portion of the insulated wire 2.

  In the example shown in FIGS. 1 and 2, four branch portions 42 for each insulated wire 2 are divided into four equal parts of the entire circumferential direction of the insulating coating 22, that is, at a pitch of 90 degrees in the circumferential direction. Is formed.

  Further, in the mold resin portion 4 of the present embodiment, each of the branch portions 42 is formed to have a tapered width from the base portion 421 side continuous with the base portion 41 to the opposite end portion 422 side.

  Further, in the mold resin portion 4 of the present embodiment, each of the branch portions 42 includes one or more transverse thin portions 423 formed across the branch portion 42. In each of the branch portions 42, the transverse thin portion 423 is a portion having a smaller thickness than an adjacent portion. In the example shown in FIGS. 1 and 2, three transverse thin portions 423 are formed in each of the branch portions 42.

<Effect>
If the resin-molded terminal-attached electric wire 1 is employed, the hard base portion 41 and the plurality of flexible branch portions 42 can be integrally formed by a single insert molding using the same synthetic resin material.

  For example, the base 41 is formed into one lump with a relatively large thickness, so that the hardness of the base 41 necessary for holding the terminal-attached electric wire 200 can be secured.

  On the other hand, each of the branch portions 42 along the surface of the insulating coating 22 is formed in an elongated shape along the longitudinal direction of the insulated wire 2, thereby forming the branch portion 42 that is easily bent following the bending deformation of the insulated wire 2. be able to.

  If each of the branch portions 42 bends following the bending of the insulated wire 2, it is possible to avoid stress concentration on the insulating coating 22 in the insulated wire 2 locally.

  Therefore, if the resin-molded terminal-equipped electric wire 1 is employed, the molded resin portion 4 that can avoid stress concentration on the insulating coating 22 of the insulated electric wire 2 while having the hardness necessary to hold the terminal-equipped electric wire 200 can be easily obtained. Can be molded.

  In the mold resin portion 4, each of the branch portions 42 is easily bent at the transverse thin portion 423 having a smaller thickness than the adjacent portion. Thereby, the branch part 42 which can bend more easily using the same material as the hard base part 41 can be shape | molded.

  In addition, each of the branch portions 42 is formed to have a tapered width from the root portion 421 side to the distal end portion 422 side. In this case, the branch portion 42 is more easily bent at the tip portion 422 side than at the root portion 421 side.

  Therefore, the insulated wire 2 whose outer surface is supported by the branch portion 42 is gradually greatly deformed from a portion fixed by the base portion 41 to a portion further away from it when receiving an external force in the bending direction. Thereby, the stress applied from the branch part 42 to the insulating coating 22 is dispersed over a wide range from the root part 421 to the tip part 422 of the branch part 42. As a result, stress concentration on the insulating coating 22 of the insulated wire 2 can be avoided more reliably.

Second Embodiment
Next, an electric wire 1A with a resin molded terminal according to the second embodiment will be described with reference to FIGS. The electric wire with resin-molded terminal 1A is different from the electric wire with resin-molded terminal 1A shown in FIGS.

  FIG. 5 is a side view of the resin molded terminal-attached electric wire 1A. FIG. 6 is a plan view of the electric wire 1A with a resin molded terminal. 5 and 6, the same components as those shown in FIGS. 1 to 4 are given the same reference numerals. Hereinafter, the difference in the resin-molded terminal-equipped electric wire 1A from the resin-molded terminal-equipped electric wire 1 will be described.

  The resin-molded terminal-attached electric wire 1A includes a terminal-attached electric wire 200 and a mold resin portion 4A that covers a part thereof. The mold resin portion 4 </ b> A is also a member formed by insert molding similarly to the mold resin portion 4. The mold resin portion 4A includes a base portion 41 and a plurality of branch portions 42A each having flexibility.

  The plurality of branch portions 42 </ b> A are branched from the base portion 41. Each of the branch portions 42 </ b> A is formed in a state along the surface of the insulating coating 22 and at intervals in the circumferential direction of the insulating coating 22.

  In the mold resin portion 4A, each of the branch portions 42A has a width that tapers from the base portion 421 side that is continuous with the base portion 41 to the opposite end portion 422 side. This is the same as the branch portion 42 of the mold resin portion 4.

  In the mold resin portion 4A, each of the branch portions 42A is formed in a shape in which the thickness gradually decreases from the root portion 421 to the tip portion 422 side, and does not include the transverse thin portion 423. This point is different from the branch portion 42 of the mold resin portion 4.

  Similarly to the branch portion 42 of the mold resin portion 4, the branch portion 42 </ b> A of the mold resin portion 4 </ b> A is more easily bent at the tip portion 422 side than at the root portion 421 side.

  Even when the resin-molded terminal-attached electric wire 1 </ b> A is employed, the same effects as those obtained when the resin-molded terminal-equipped electric wire 1 is employed are obtained.

<Application example>
In the resin molded terminal-attached electric wires 1 and 1A, the mold resin portions 4 and 4A collectively cover all the core wire-terminal connection portions 201 in the three electric wires with terminals 200. However, it is also conceivable that the number of electric wires with terminals 200 included in the electric wires with resin molded terminals 1 and 1A is one. In this case, the mold resin parts 4, 4 </ b> A are formed in a shape that covers the core wire-terminal connection part 201 in one terminal-attached electric wire 200.

  Further, in the resin molded terminal-attached electric wires 1 and 1A, the mold resin portions 4 and 4A collectively cover all the core wire-terminal connection portions 201 in the two electric wires with terminals 200 or the four or more electric wires with terminals 200. It can be considered to be formed into a shape.

  Moreover, in the electric wire with a resin molded terminal 1, 1A, it is considered that an adhesive layer is formed on the outer peripheral surface of the insulating coating 22 of the insulated wire 2. This adhesive layer is formed on the outer peripheral surface of the end portion of the insulating coating 22 covered with the base portion 41 of the mold resin portions 4 and 4A in the entire circumferential direction.

  The adhesive layer prevents a gap from being generated between the outer peripheral surface of the insulating coating 22 and the inner surface of the base portion 41 of the mold resin portions 4 and 4A.

  In addition, the electric wire with a resin molded terminal according to the present invention can be freely combined with each of the embodiments and application examples shown above or within the scope of the invention described in each claim. It is also possible to configure by appropriately modifying or omitting a part.

DESCRIPTION OF SYMBOLS 1,1A Electric wire with resin molding terminal 2 Insulated wire 200 Electric wire with terminal 201 Core wire-terminal connection part 21 Core wire 22 Insulation coating 3 Terminal 31 Contact part 310 Through-hole 32 Core wire connection part 4, 4A Mold resin part 41 Base of mold resin part 42, 42A Branch part of mold resin part 421 Base part of branch part 422 Tip part of branch part 423 Transverse thin part

Claims (3)

An insulated wire and a terminal-attached wire having a terminal connected to an end of a core wire of the insulated wire;
A mold resin portion formed by insert molding using a part of the electric wire with terminal as an insert portion,
The mold resin part is
A base including a portion covering the connecting portion between the core wire and the terminal in the electric wire with terminal;
A plurality of flexible branch portions each formed along the surface of the insulation coating in the insulated wire and branched from the base portion in a state of being arranged at intervals in the circumferential direction of the insulation coating. Electric wire with molded terminal.   2. The electric wire with a resin molded terminal according to claim 1, wherein each of the branch portions of the mold resin portion includes a transverse thin portion that is formed across the branch portion and has a smaller thickness than an adjacent portion.   3. The electric wire with a resin molded terminal according to claim 1, wherein each of the branch portions of the mold resin portion has a width that is tapered from a base portion side continuous with the base portion to a tip portion side opposite thereto. .

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