JP6042635B2 - Electrical wire terminal treatment method - Google Patents

Description

The present invention relates to a terminal treatment how a wire coated with conductor.

  In a wire harness in which a terminal is fixed to a conductor exposed at one end, a joint portion between the terminal and the conductor is covered with a resin to be waterproofed (for example, see Patent Documents 1 and 2).

JP 2001-162646 A JP 2001-162647 A

  When the terminal treatment is performed as described above, the joint portion between the conductor and the terminal is disposed in the mold, and in this state, the resin is injected into the mold by a molding machine.

  By the way, when the resin is injected, the terminal may be squeezed by the injection pressure of the resin. Then, the terminal position becomes unstable, and a positional shift may occur in the terminal after molding.

The present invention has been made in view of the above circumstances, an object thereof is to provide a terminal processing how the wire that can be covered with stable resin terminal pin is bonded.

In order to achieve the above-described object, the wire terminal processing method of the present invention is characterized by the following (1) .
(1) An end treatment method for an electric wire having a plurality of conductors,
A terminal joining step for joining a plurality of terminals to the plurality of conductors exposed from the coating;
A molding step of arranging a plurality of joints between the conductor and the terminal in a molding space of a mold, filling the molding space with resin, and molding the plurality of joints;
Including
Each of the terminals is an L-shaped terminal including a flat plate-like joint portion having the joint portion and a flat tab portion extending from the joint portion.
In the lower part of the mold, a plurality of terminal insertion holes each having a bottom and extending in the vertical direction and having an opening at the upper end communicating with the molding space are provided corresponding to the plurality of terminals,
In the upper part of the mold, the tab portions of the plurality of terminals are respectively inserted into the corresponding terminal insertion holes at positions shifted in the horizontal direction from the positions of the plurality of terminal insertion holes. A plurality of gate holes extending in the vertical direction and having a lower end opening communicating with the molding space at positions above the joint portions of the plurality of terminals in a set state where the terminals are arranged in the molding space, respectively. Provided,
In the molding step, in the set state, the resin is injected from each gate hole toward a joint portion of each terminal.

  In the terminal processing method of (1) above, in the molding process, the resin filling the molding space is injected from the gate hole corresponding to the terminal toward each terminal, and each terminal is made part of the mold by injection pressure. By causing the contact to occur, it is possible to suppress terminal blurring during resin injection. Thereby, the terminal can be positioned and molded with high accuracy.

The present invention can provide a terminal treatment how a wire that can be covered with stable resin terminal pin is bonded.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a connector according to the present embodiment. FIG. 2 is a perspective view of the end portion of the coaxial cable. FIG. 3 is a perspective view of a joint portion between a conductor of a molded electric wire and a terminal. FIG. 4 is a perspective view of a joint portion between the conductor of the electric wire and the terminal. FIG. 5 is a schematic cross-sectional view of a mold for explaining a molding process in the terminal processing method. FIG. 6 is a schematic perspective view of a molding space for explaining the molding process in the terminal processing method. FIG. 7 is a schematic cross-sectional view of a mold for explaining a molding process according to a modification. FIG. 8 is a schematic perspective view of a resin mold part formed in the molding process according to the modification.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.

  In the present embodiment, a coaxial wire having a core portion and an external conductor is illustrated as an example of a wire to be subjected to terminal processing.

  1 is a perspective view of a connector according to the present embodiment, FIG. 2 is a perspective view of an end portion of a coaxial wire, FIG. 3 is a perspective view of a joint portion between a conductor of a molded wire and a terminal, and FIG. It is a perspective view of the junction location of the conductor and terminal of an electric wire.

  As shown in FIG. 1, the connector 11 includes a housing 12 molded from a synthetic resin such as plastic. The housing 12 includes a connection portion 12a and a wire lead-out portion 12b. The tab portion 13a of the pair of terminals 13 protrudes from the connection portion 12a, and the coaxial wire 14 is drawn out from the wire lead-out portion 12b. In this connector 11, the connecting portion 12a of the housing 12 can be connected to the mating connector.

  As shown in FIG. 2, the coaxial cable 14 has a core portion 23 in which an inner conductor 21 is covered with an insulator (coating) 22 at the center thereof, and an outer conductor 24 is provided around the core portion 23. Furthermore, the periphery is covered with a sheath (cover) 25.

  The inner conductor 21 is, for example, a stranded wire made of a plurality of copper wires or a single wire made of a copper wire. The insulator 22 is formed from an insulating material made of synthetic resin. The outer conductor 24 is obtained by winding a plurality of strands 24a such as copper wires in one direction. The sheath 25 is formed from an insulating material made of synthetic resin.

  In the coaxial cable 14, the outer conductor 24 is not used as a shield but is used as a conductive wire in the same manner as the inner conductor 21, and is used as a wire harness wired to a vehicle such as an automobile. In such an outer conductor 24 of the coaxial cable 14, an element wire thicker than a thin element wire like an outer conductor for shielding is used.

  As shown in FIG. 3, a resin mold portion 31 that covers a joint portion between the inner conductor 21 and the outer conductor 24 of the coaxial cable 14 and the terminal 13 is accommodated in the housing 12. The resin mold portion 31 is molded from, for example, an elastic resin such as rubber, and the joint portion between the inner conductor 21 and the outer conductor 24 of the coaxial cable 14 and the terminal 13 is water-stopped by the resin mold portion 31. Has been.

  As shown in FIG. 4, the coaxial cable 14 is branched at its ends into an inner conductor 21 and an outer conductor 24, and the inner conductor 21 and the outer conductor 24 are respectively joined to the terminals 13. .

  The terminal 13 is bent in an L shape, and the end opposite to the tab portion 13a is a joint portion 13b. And the edge part of the inner conductor 21 and the outer conductor 24 is joined to this junction part 13b. The terminal 13 is a barrelless terminal that is not provided with a barrel like a crimp terminal, and the inner conductor 21 and the outer conductor 24 are ultrasonically bonded to the bonding portion 13b. The method of joining the inner conductor 21 and the outer conductor 24 to the joint 13b of the terminal 13 is not limited to ultrasonic joining, and may be solder joining or the like, and a barrel is formed at the joint 13b of the terminal 13. Then, the inner conductor 21 and the outer conductor 24 may be crimped and joined to the joint portion 13b.

  The periphery of the resin mold portion 31 is covered with the housing 12 to form the connector 11. The housing 12 is formed by integrally molding a resin so as to cover the resin mold portion 31. In addition, you may attach the housing 12 shape | molded previously to the resin mold part 31. FIG.

  Next, terminal processing in the coaxial cable 14 will be described for each process.

(Terminal joining process)
First, the end portions of the branched inner conductor 21 and outer conductor 24 are joined to the joining portion 13b of the terminal 13 by ultrasonic joining (see FIG. 4).

(Molding process)
Next, the joint portion between the inner conductor 21 and outer conductor 24 of the coaxial cable 14 and the terminal 13 is covered with resin.

  In this molding step, a mold 41 is used as shown in FIGS. The metal mold 41 has a molding space S, and a joint location A between the inner conductor 21 and the outer conductor 24 and the terminal 13 is disposed in the molding space S. Further, the mold 41 has an electric wire gripping portion 41 a that grips the end portion of the coaxial electric wire 14 and a terminal insertion hole 41 b into which the tab portion 13 a of the terminal 13 is inserted. The terminal insertion hole 41b is formed with a predetermined depth. As a result, a predetermined dimension portion on the distal end side of the tab portion 13a of the terminal 13 is inserted and held in the terminal insertion hole 41b, and the distal end of the tab portion 13a is the bottom of the terminal insertion hole 41b (part of the mold). The movement in the insertion direction is restricted by contacting with 41c.

  The mold 41 has a plurality of gate holes 42 corresponding to the terminals 13 communicating with the molding space S at the upper part thereof. These gate holes 42 are respectively provided along the terminal insertion holes 41 b above the joint portions A between the internal conductors 21 and the external conductors 24 disposed in the molding space S and the terminals 13.

  The molten resin is injected from the gate hole 42 of the mold 41 into the molding space S substantially evenly by a molding machine. Then, the molding space S is filled with a molten resin.

  At this time, the injection pressure of the resin acts on the junction A between the inner conductor 21 and the outer conductor 24 of the terminal 13 disposed at the tip of the gate hole 42. However, since the tab 13a of the terminal 13 is inserted into the terminal insertion hole 41b of the mold 41, and the tip of the terminal 13 comes into contact with the bottom 41c of the terminal insertion hole 41b, the forward movement in the insertion direction is restricted. The terminal 13 is not crushed and shaken by the injection pressure of the resin. That is, the terminal 13 to which the inner conductor 21 and the outer conductor 24 are joined is maintained in a stable position in the molding space S.

  After the resin is injected, when the resin is cured and the resin mold portion 31 is molded, the resin mold portion 31 is removed from the mold 41 and taken out.

  When the terminal processing is performed on the coaxial cable 14 as described above, the housing 12 is molded so as to cover the resin mold portion 31, and the connector 11 is completed.

  Thus, according to the terminal processing method of the electric wire according to the embodiment, in the molding process, the resin filling the molding space S is injected from the gate hole 42 corresponding to the terminal 13 toward the respective terminals 13, respectively. By causing the tip of the tab portion 13a of the terminal 13 to abut against the bottom 41c of the terminal insertion hole 41b of the mold 41 by injection pressure, it is possible to suppress blurring of the terminal 13 during resin injection. Thereby, the terminal 13 can be positioned with high accuracy, and the joint portion A between the inner conductor 21 and the outer conductor 24 and the terminal 13 can be molded. And the joint location A of the inner conductor 21 and the outer conductor 24 and the terminal 13 is molded in this way, so that the joint location A can be satisfactorily stopped.

  And according to said connector 11, since the resin mold part 31 of the terminal 13 molded with high precision was covered with the housing 12, it can be set as the connector 11 with high connection reliability with the other party connector. .

  Next, terminal processing in the coaxial cable 14 according to the modification will be described for each process.

  In this modification, a mold 41A having terminal pressing pins 50 is used in the molding process as shown in FIG. An end portion of the terminal pressing pin 50 protrudes into the molding space S and is disposed above the junction A between the inner conductor 21 and the outer conductor 24 and the terminal 13 in the molding space S. Thereby, the terminal pressing pin 50 is brought into contact with the terminal 13 arranged in the mold 41 </ b> A at the joint portion A between the inner conductor 21 and the outer conductor 24.

  Moreover, in this metal mold | die 41, the gate hole (illustration omitted) is formed in the other location different from the upper direction of the junction location A. FIG.

  Then, molten resin is injected into the molding space S from the gate hole communicating with the molding space S of the mold 41A. Then, the molten resin injected into the molding space S is filled.

  At this time, the injection pressure of the resin acts on the terminal 13 in the molding space S. The tab 13a of the terminal 13 is inserted into the terminal insertion hole 41b of the mold 41, and the inner conductor 21 and the outer conductor 24 are further inserted. Since the terminal pressing pin 50 is in contact with the joint portion A, the terminal 13 is not pinched and shaken by the injection pressure of the resin. That is, the terminal 13 to which the inner conductor 21 and the outer conductor 24 are joined is maintained in a stable position in the molding space S.

  After the resin is injected, when the resin is cured and the resin mold portion 31 is molded, the resin mold portion 31 is removed from the mold 41 and taken out.

  When the terminal processing is performed on the coaxial cable 14 as described above, the housing 12 is molded so as to cover the resin mold portion 31, and the connector 11 is completed.

  Thus, according to the terminal processing method of the electric wire concerning a modification, in the molding process, the terminal pressing pin 50 is kept in contact with the terminal 13, thereby suppressing the shaking of the terminal 13 at the time of resin injection. it can. Thereby, the terminal 13 can be positioned with high accuracy, and the joint portion A between the inner conductor 21 and the outer conductor 24 and the terminal 13 can be molded. Then, by covering the resin molded portion 31 of the terminal 13 molded with high precision with the housing 12 to form the connector 11, the connector 11 having high connection reliability with the mating connector can be obtained.

  In this modified example, as shown in FIG. 8, a hole 31 a is formed by a terminal pressing pin 50 in the molded resin mold portion 31. Therefore, by inserting a test probe or the like through the hole 31a and conducting it to the terminal 13 portion, a continuity test can be performed and a quality function can be confirmed. Then, after the continuity test, the hole 31a is filled with a resin to fill the hole 31a, so that the junction A between the inner conductor 21 and the outer conductor 24 and the terminal 13 can be stopped well.

  In addition, although the case where the terminal of the electric wire which consists of the coaxial electric wires 14 was processed was demonstrated to the said embodiment as an example, as an electric wire, not only the coaxial electric wire 14 but the several insulated electric wire which coat | covered the conductor may be sufficient.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

11 Connector 12 Housing 13 Terminal 14 Coaxial wire (wire)
21 Inner conductor (conductor)
22 Insulator (covering)
25 Sheath (Coating)
24 Outer conductor (conductor)
31 Resin mold part (mold part)
41, 41A Mold 41c Bottom (part of mold)
42 Gate hole 50 Terminal holding pin (pin)
A Joint point S Molding space

Claims (1)

An end treatment method for an electric wire having a plurality of conductors,
A terminal joining step for joining a plurality of terminals to the plurality of conductors exposed from the coating;
A molding step of arranging a plurality of joints between the conductor and the terminal in a molding space of a mold, filling the molding space with resin, and molding the plurality of joints;
Including
Each of the terminals is an L-shaped terminal including a flat plate-like joint portion having the joint portion and a flat tab portion extending from the joint portion.
In the lower part of the mold, a plurality of terminal insertion holes each having a bottom and extending in the vertical direction and having an opening at the upper end communicating with the molding space are provided corresponding to the plurality of terminals,
In the upper part of the mold, the tab portions of the plurality of terminals are respectively inserted into the corresponding terminal insertion holes at positions shifted in the horizontal direction from the positions of the plurality of terminal insertion holes. A plurality of gate holes extending in the vertical direction and having a lower end opening communicating with the molding space at positions above the joint portions of the plurality of terminals in a set state where the terminals are arranged in the molding space, respectively. Provided,
In the molding step, in the set state, the resin is injected from the gate holes toward the joints of the terminals.

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