JP5022968B2 - Connection structure and connection method of terminal to covered wire - Google Patents

Description

  The present invention relates to a terminal connection structure and a connection method for a coated electric wire, which is particularly effective when connecting a small terminal to an ultra-thin coated electric wire.

  As a method for connecting a terminal or the like to a covered electric wire without peeling off, methods such as pressure welding, piercing, and thermal welding are known.

  As shown in FIGS. 2A and 2B, when the electric wire W and the press contact terminal 100 are connected by press contact, a pair of press contact blades 105 and 105 facing the wire press contact portion 104 of the terminal 100 with a gap therebetween. And press-fitting the covered electric wire W between these press-contacting blades 105 to bring the press-contacting blade 105 into contact with the conductor Wa while the press-contacting blade 105 cuts the resin coating Wb. Thereby, the terminal 100 and the conductor Wa are made conductive (see, for example, Patent Document 1).

  Further, as shown in FIGS. 3A to 3C, when connecting the wire W and the terminal by piercing, the upper ends of both side plates 116 of the U-shaped wire connecting portion 114 having the bottom plate 115 and both side plates 116. The piercing piece 117 for piercing is provided in a protruding manner, and the tip 117a of the piercing piece 117 is pierced into the resin coating Wb while bending the piercing piece 117 inward with the lower mold 121 and the upper mold 122, and the inner conductor Reach Wa. Thereby, the terminal and the conductor Wa are made conductive (for example, refer to Patent Document 1).

As shown in FIG. 4, when connecting the covered electric wire W and the covered electric wire W by heat welding, the connection auxiliary piece 150 bent in a U-shape is inserted between the pair of electrodes 161 and 162 and connected. A pair of covered electric wires W to be connected is inserted into a space in the auxiliary piece 150, the electrodes 161 and 162 are urged toward each other to crush the connection auxiliary piece 150, and the electrodes 161 and 162 are energized. Then, by heating the connection auxiliary piece 150, the resin coating of the covered electric wire W sandwiched between the voids is melted and removed, and the connection auxiliary piece 150 and the covered electric wire are electrically connected (for example, Patent Document 2).
JP 2003-264013 A Japanese Patent Laid-Open No. 10-208842

  By the way, the method by pressure welding shown in FIG. 2 and the method by piercing shown in FIG. 3 have a small fixing force when connecting an ultra-thin wire and a small terminal, and the electrical connection is small. There was a risk of instability. 4 is effective for a single coated wire having a thin resin coating such as a magnet wire, but cannot be used as it is for an electric wire having a thicker resin coating. was there.

  In view of the above circumstances, the present invention provides a terminal connection structure and a connection method for a coated electric wire that can exhibit stable connection performance even when an ultra-thin wire and a small terminal are electrically connected. For the purpose.

  The connection structure of the terminal to the covered electric wire of the invention of claim 1 is a metal three-dimensional network-like or three-dimensional porous intermediate conducting member in which void portions and metal portions exist in a dispersed manner and can be embedded in a molten resin Is covered on the outer side of the resin coating of the coated electric wire, and the resin coating is melted in that state, so that the intermediate conductive member enters the resin coating and contacts the conductor of the electric wire, The terminal and the conductor of the electric wire are conducted through the intermediate conducting member by crimping or pressing the terminal from above the intermediate conducting member.

  According to a second aspect of the present invention, there is provided a terminal connection structure for the covered electric wire according to the first aspect, wherein the intermediate conducting member is made of a cotton-like metal fiber.

  According to a third aspect of the present invention, there is provided a method for connecting a terminal to a covered electric wire, wherein a gap portion and a metal portion are dispersedly present and can be embedded in a molten resin. Covering the outer side of the resin coating of the covered electric wire, and while the resin coating is heated and melted in that state, the intermediate conductive member is intruded into the resin coating to contact the conductor of the electric wire, and the intermediate conductive member The terminal and the conductor of the electric wire are conducted through the intermediate conducting member by crimping or pressing the terminal from above.

  According to a fourth aspect of the present invention, there is provided a method for connecting a terminal to a covered electric wire according to the third aspect, wherein a metal fiber cotton-like body is used as the intermediate conducting member.

  The invention according to claim 5 is a method for connecting a terminal to the covered electric wire according to claim 4, wherein the metal fiber cotton-like body is formed into a cylindrical shape, and the formed cylindrical body is used as the intermediate conductive member. It is characterized by covering the outer side of the resin coating of the covered electric wire.

  According to the first aspect of the present invention, since the terminal and the conductor are made conductive through the metal intermediate conductive member penetrating into the molten resin coating, the terminal and the electric wire are not peeled off. Can be electrically connected. In addition, since the terminal is connected to the part where the resin and the intermediate conductive member are mixed, it becomes possible to exert the adhesive force to the resin-coated part, and when connecting the terminal to the stripped conductor In comparison, the mechanical bonding force can be increased. Therefore, even when the ultra-thin wire and the small terminal are electrically connected, the fixing force of the connecting portion can be kept large, and the electrical connection performance can be stabilized.

  According to the invention of claim 2, since the intermediate conductive member is made of a cotton-like metal fiber, the intermediate conductive member fits well between the conductor and the terminal when the terminal is crimped or pressed. Thus, conductivity can be improved.

  According to the invention of claim 3, by melting and melting the resin coating, a metal intermediate conducting member is inserted into the resin coating, and the terminal is crimped or pressed on the intermediate conducting member, thereby Since the conductor of the electric wire is conducted through the intermediate conductive member, the terminal and the electric wire can be electrically connected without peeling off the resin coating. In addition, since the terminal is connected to the part where the resin and the intermediate conductive member are mixed, the terminal can be connected to the stripped conductor. Compared to the case, the mechanical joining force can be strengthened. Therefore, even when the ultra-thin wire and the small terminal are electrically connected, the fixing force of the connecting portion can be kept large, and the electrical connection performance can be stabilized.

  According to the invention of claim 4, when the terminal is crimped or pressure-contacted by using an intermediate conductive member made of a cotton-like metal fiber, the intermediate conductive member is placed between the conductor and the terminal. It can be used well and can improve conductivity.

  According to the invention of claim 5, the metal fiber cotton-like body is formed into a cylindrical shape, and the formed cylindrical body is placed on the outer side of the resin coating of the covered electric wire as an intermediate conducting member. If the cylindrical body is formed in accordance with the size of the wire connecting portion of the terminal, the intermediate conductive member can be easily mounted on the outer periphery of the resin coating, and the terminal can be easily mounted from above.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1A and 1B are explanatory diagrams of a connection structure and a connection method according to the embodiment. FIG. 1A is a perspective view showing a state before connection, FIG. 1B is a perspective view showing a process in the middle of connection, FIG. (C) is sectional drawing of the connected part.

  The terminal 1 has an electrical connection portion 2 with a counterpart terminal at the front end and a wire connection portion 3 at the rear end, and has a common bottom plate 6 from the electrical connection portion 2 to the wire connection portion 3. The electric wire connection portion 3 is provided with two pairs of pressure-bonding pieces 4 and 5 standing up and down from both side edges of the bottom plate 6. Usually, the crimping piece 4 on the front side is provided for crimping to the exposed conductor Wa of the terminal portion of the electric wire W, and the crimping piece 5 on the rear side is provided for crimping on the portion of the electric wire W having the resin coating Wb. ing.

  In the connection method of the present embodiment, first, the intermediate conduction member 10 is prepared. The intermediate conducting member 10 is a metal member having a three-dimensional network shape or a three-dimensional porous shape in which void portions and metal portions exist in a dispersed manner and can be embedded in a molten resin. Here, as the intermediate conducting member 10, a cylindrical body obtained by forming a metal fiber cotton-like body 11 into a cylindrical shape is used.

  When crimping the terminal 1 to the end of the covered electric wire W, first, as shown in FIG. 1A, the intermediate conductive member 10 formed into a cylindrical shape is not covered with the resin-coated Wb of the covered electric wire W. Put directly on the outer periphery of the terminal.

  Next, in that state, the end of the electric wire W with the intermediate conducting member 10 is placed on the bottom plate 6 of the electric wire connecting portion 3 of the terminal 1, and the resin coating Wb is heated and melted in the resin coating Wb. A cylindrical intermediate conducting member 10 made of a metal fiber cotton 11 is intruded and brought into contact with the conductor Wa of the electric wire W, and the crimping pieces 4 and 5 of the terminal 1 are crimped from above the intermediate conducting member 10. The terminal 1 and the conductor Wa of the electric wire are conducted through the intermediate conducting member 10.

  By doing so, as shown in FIG. 1C, the intermediate conducting member 10 enters the resin coating Wb and contacts the conductor Wa of the electric wire, and the crimping piece of the terminal 1 through the intermediate conducting member 10 A pressure-bonding structure (connection structure) in which 4, 5 and the conductor Wa of the electric wire are conducted is obtained.

  According to the above connection method and connection structure, while the resin coating Wb is heated and melted, the metal intermediate conductive member 10 is inserted into the resin coating Wb, and the terminal 1 is crimped from above the intermediate conductive member 10. Thus, since the terminal 1 and the conductor Wa of the electric wire are conducted through the intermediate conducting member 10, the terminal 1 and the electric wire W can be electrically connected without peeling off the resin coating Wb. In addition, since the terminal 1 is connected to the portion where the resin and the intermediate conductive member 10 are mixed, the fixing force to the resin-coated Wb portion can be exhibited, and the peeled conductor Wa can be applied. Compared with the case where the terminal 1 is connected, the mechanical joining force can be increased. Therefore, even when the ultra-thin wire and the small terminal are electrically connected, the fixing force of the connecting portion can be kept large, and the electrical connection performance can be stabilized.

  In particular, by using the intermediate conductive member 10 made of the metal fiber cotton 11, the intermediate conductive member 10 can be well adapted between the conductor Wa and the terminal 1 when the terminal 1 is crimped. , Conductivity can be increased.

  In addition, the metal fiber cotton-like body 11 is formed into a cylindrical shape, and the formed cylindrical body is placed on the outer periphery of the resin-coated Wb of the covered electric wire W as the intermediate conductive member 10. If the cylindrical body is formed in accordance with the size of the electric wire connecting portion 3, the intermediate conductive member 10 can be easily mounted on the outer periphery of the resin coating Wb, and the terminal 1 can be easily mounted from above. Can be.

  In the above-described embodiment, the case where a metal fiber cotton-like body 11 formed into a cylindrical shape is used as the intermediate conductive member 10, but a simple non-woven shape is used on the outer periphery of the resin coating Wb. It may be wound. Further, instead of the metal fiber cotton-like body 11, a crushable three-dimensional porous material may be used.

  Moreover, in the said embodiment, although the crimping | compression-bonding pieces 4 and 5 were used for connecting a terminal to an electric wire, you may employ | adopt a pressure welding.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the connection structure and connection method of embodiment of this invention, (a) is a perspective view which shows the state before connecting, (b) is a perspective view which shows the process in the middle of connecting, (c) connected It is sectional drawing of a part. It is explanatory drawing of a conventional method, (a) is a perspective view of a press-contact terminal, (b) is sectional drawing of a press-contact connection part. It is explanatory drawing of a conventional method, and is principal part sectional drawing which shows the connection process (a)-(c) by piercing. It is explanatory drawing of a conventional method, (a) is a perspective view which shows the state which set the electric wire which should be connected between the electrodes for heat welding, (b) is an expansion perspective view of the component for a connection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal 3 Electric wire connection part 10 Intermediate | middle conduction | electrical_connection member 11 Cotton-like body of metal fiber W Covered electric wire Wa Conductor W Resin coating

Claims (5)

  A metal three-dimensional network-like or three-dimensional porous intermediate conductive member that has voids and metal parts dispersedly and can be embedded in the molten resin is placed on the outside of the resin coating of the covered electric wire. When the resin coating is melted, the intermediate conducting member penetrates into the resin coating and contacts the conductor of the electric wire, and the terminal is crimped or pressed on the intermediate conducting member. A terminal connection structure for a covered electric wire, wherein a conductor of the terminal and the electric wire is conducted through the intermediate conducting member. It is a connection structure of the terminal to the covered electric wire according to claim 1,
A structure for connecting a terminal to a covered electric wire, wherein the intermediate conducting member is made of a cotton-like metal fiber.   A state in which voids and metal parts exist in a dispersed manner and a metal three-dimensional network-like or three-dimensional porous intermediate conductive member that can be embedded in the molten resin is placed on the outside of the resin coating of the covered electric wire. While the resin coating is heated and melted, the intermediate conducting member is intruded into the resin coating and brought into contact with the conductor of the electric wire, and the terminal and the electric wire are crimped or pressed on the intermediate conducting member. A method for connecting a terminal to a covered electric wire, wherein the conductor is electrically connected through the intermediate conductive member. It is a connection method of the terminal to the covered electric wire according to claim 3,
A method for connecting a terminal to a covered electric wire, wherein a metal fiber cotton-like body is used as the intermediate conducting member. It is a connection method of the terminal to the covered electric wire according to claim 4,
A method for connecting a terminal to a covered electric wire, comprising: forming the cotton-like body of the metal fiber into a cylindrical shape, and covering the formed cylindrical body on the outside of the resin coating of the covered electric wire as the intermediate conductive member.

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