JP5552006B2 - Terminal connection structure at the end of the wire - Google Patents

Description

  The present invention relates to a terminal connection structure for an end portion of an electric wire in which the end portion of the electric wire is mounted and soldered inside the terminal.

  In recent years, in the automobile manufacturing field, as a part of reducing the weight of a vehicle body, it has been required to use a lightweight electric wire such as aluminum for a power cable or the like. In many cases, the aluminum electric wire used for the power cable is a stranded wire obtained by twisting a large number of thin aluminum wires, and when forming a harness, the end of the electric wire is attached to the inside of the terminal. This terminal is soldered to the electric wire in a state of being mounted on the outer periphery of the end portion of the electric wire.

  In the above soldering, the aluminum wire has an oxide film on the surface of the thin wire, and it is difficult to achieve good electrical connection, and the thermal conductivity is low with respect to the copper or brass terminal. Even if the terminal part is heated, the entire thin wire inside the terminal does not reach the required temperature, so flux and molten solder are not introduced to the entire inside of the terminal, and voids are formed in the solder or soldering There was a problem that it was easy to make a part that was not done. Such voids are not preferable because they cause discharge, galvanic corrosion, an increase in electrical resistance, and heat generation during energization.

  In addition, there is a high possibility that air or flux is present in the void. When such an intervention is present, heat conduction is difficult, and soldering reliability is further reduced. Therefore, in order to improve the heat conduction by reducing the void, it is conceivable to crimp the terminal and the end of the electric wire with a large force, but this may cause damage to the electric wire, and the wire breaks. It can also be a cause of

  Accordingly, the present inventors have disclosed a terminal connection structure for an end portion of an electric wire in which the end portion of the electric wire is attached to the inner side of the terminal and soldered according to Japanese Patent Application No. 2010-60284 (filed on Mar. 17, 2010). A metal pin having a higher thermal conductivity than that of the electric wire is inserted as a heat transfer path from the outside of the terminal at the time of soldering, and heat from the outside of the terminal is passed through the metal pin to the inside. We proposed a terminal structure that can be soldered by transmission.

JP 2010-20980 A

  As a result of further intensive studies to improve the terminal structure according to the above proposal, the present inventor has been able to invent the terminal structure described below.

  That is, the present invention further improves the terminal structure according to this proposal, and enables the uniform transfer of heat required for introducing flux and solder to the entire electric wire inside the terminal. Furthermore, the present invention provides a terminal connection structure for an end portion of an electric wire that can be satisfactorily soldered.

  The terminal connection structure of the wire end portion according to the present invention is a wire end portion terminal connection structure in which a plurality of fine wires are stranded or aggregated and connected to a terminal by soldering, and is integrated with the terminal. It has a separate metal sheet, and this metal sheet is interposed in the shape of the heat transfer path at the time of heating performed before the introduction of flux or solder in the end portion of the electric wire.

  Preferably, the metal sheet forms a roll or multiple fold and is interposed in the end portion of the electric wire to constitute the heat transfer path. Multiple folding includes not only spell folding but also other folding methods, for example, various folding such as Kannon folding, map folding, and the like.

  Preferably, the metal sheet is rolled or multiple-folded together with the end of the electric wire from a state in which the metal sheet is unfolded integrally with the terminal.

  Preferably, the metal sheet is inserted into the insertion hole of the connecting tube provided in the terminal in the form of the roll or multiple fold. In this case, the number of roll windings and the number of multiple folds may be single or plural.

  Preferably, the metal sheet is rolled and the upper end side protrudes from the insertion hole of the connection tube.

  Preferably, the metal sheet is multiple-folded, and holes for inserting the wire end portions are formed at predetermined intervals in the joints between the multiple fold portions.

  Preferably, the metal sheet has a shape capable of holding a flux such as a mesh, a hole, and an unevenness.

  Preferably, the metal sheet is made of copper alone, or an alloy containing tin, nickel, zinc or the like with respect to copper, or a copper-plated tin and zinc material. The ionization tendency is in the middle between copper and aluminum. Thereby, when a terminal is copper, the electric potential difference between the metals by the difference in the ionization tendency between both is eased, and it becomes possible to suppress electrolytic corrosion.

  In the structure of the present invention, when soldering the wire end and the terminal, the metal sheet is placed in the wire end when the terminal and the connecting tube are heated from the outside and flux and molten solder are successively introduced from the wire end. As a result, the heat is uniformly transferred to the entire end of the electric wire, so that the flux and the solder are easily introduced uniformly to the entire end of the electric wire. Therefore, soldering can be performed reliably. Moreover, since generation | occurrence | production of a void is suppressed, the said malfunction resulting from a void is eliminated. In addition, since heat conduction is improved by reducing voids, the terminal and the end of the electric wire have been caulked and compressed with a large force, but such caulking compression is no longer necessary, and the electric wire is not damaged. Soldering can be performed without fear of disconnection.

  In the case where a metal plating layer is formed on the surface of the metal sheet, the metal plating layer melts and flows out, and the flux is introduced into the electric wire along the surface of the metal sheet and spreads throughout the inside of the terminal. In addition to removing the oxide film on the surface, the molten solder is also introduced into the electric wire along the metal sheet and the molten plating, like the flux, and spreads and solidifies all over the inside of the terminal, so there is no generation of voids. The electric wires and the terminals can be electrically connected to each other.

  According to the present invention, the end of the electric wire can be solder-connected to the terminal without generating a void inside, and as a result, the above-described problems caused by the void are eliminated, and a terminal connection structure with a good solder connection state is obtained. be able to.

FIG. 1A is a diagram showing an external configuration of a terminal connection structure of an end portion of an electric wire according to an embodiment of the present invention. 1B is a diagram showing a cross-sectional configuration along the line AA of the structure of FIG. 1A. FIG. 1C is a diagram used for explaining the first step of the connection method having the above structure. FIG. 1D is a diagram used for explaining a second step of the connection method having the above structure. FIG. 1E is a diagram used for explaining a third step of the connection method having the above structure. FIG. 2A is a plan view showing an exploded state of a terminal connection structure for an end portion of an electric wire according to another embodiment of the present invention. FIG. 2B is a diagram used for explaining the first step of the connection method having the structure of FIG. 2A. FIG. 2C is a diagram used for explaining the second step of the connection method having the structure of FIG. 2A. FIGS. 3A and 3B are views showing a planar configuration and a cross-sectional configuration of a terminal portion of a terminal connection structure of an end portion of an electric wire according to still another embodiment of the present invention. FIGS. 3A and 3B are views respectively showing a planar configuration and a cross-sectional configuration of the end portion of the electric wire in the embodiment of FIG. 3A. FIG. 3C is a diagram used in the description of the steps of the connection method of the embodiment according to FIGS. 3A and 3B and is a view seen from the front side. FIG. 3D is a diagram showing a planar configuration of a structure connected by the connection method of the embodiment according to FIGS. 3A and 3B. FIG. 4A is a diagram used for explaining a first step of a connection method in a connection structure according to still another embodiment of the present invention. FIG. 4B is a diagram used for explaining the second step of the connection method in the connection structure according to the embodiment of FIG. 4A. FIG. 4C is a diagram showing an external configuration of a connection structure connected through the respective steps of FIGS. 4A and 4B. FIG. 5A is a diagram used for explaining a first step of a connection method in a connection structure according to still another embodiment of the present invention. FIG. 5B is a diagram used for explaining the second step of the connection method in the connection structure according to the embodiment of FIG. 5A. FIG. 5C is a diagram showing an external configuration of a pin-shaped body connected through the respective steps of FIGS. 5A and 5B. FIG. 5D is a diagram showing a state in which the pin-shaped body of FIG. 5C is inserted and connected to the female connector on the board as a male connector. FIG. 6A is a diagram used for explaining a first step of a connection method in a connection structure according to still another embodiment of the present invention. FIG. 6B is a diagram used for explaining the second step of the connection method in the connection structure according to the embodiment of FIG. 6A. FIG. 6C is a diagram showing an external configuration of a connection structure connected through the respective steps of FIGS. 6A and 6B. FIG. 6D is a diagram showing a cross-sectional configuration of the connection structure shown in FIG. 6C. FIG. 7: A is a figure which shows the attachment process of the electric wire edge part to the metal sheet of a zigzag fold structure in the connection structure which concerns on another embodiment of this invention. FIG. 7B is a diagram showing a cross-sectional configuration in the attached state. FIG. 7C is a diagram showing a state in which the metal sheet with the wire ends attached is inserted into the square terminal. FIG. 7D is a diagram showing a connection structure after the insertion. FIG. 7E is a diagram showing a connection structure using round terminals instead of the square terminals. FIG. 8A is a diagram showing a step of attaching an end portion of an electric wire in a connection structure according to still another embodiment of the present invention. FIG. 8B is a diagram showing a step subsequent to the step of FIG. 8A. FIG. 8C is a diagram showing a further step after the step of FIG. 8B. FIG. 8D is a view showing a connection structure manufactured through the steps of FIGS. 8A to 8C.

  The terminal connection structure of the electric wire end part which concerns on one Embodiment of this invention is demonstrated with reference to FIG. 1A thru | or FIG. 1E. First, referring to FIG. 1A and FIG. 1B, the terminal connection structure of the embodiment is mounted and soldered inside the terminal 1 in a state where the end 2 b of the electric wire 2 is wound in a roll shape by the metal sheet 3. Yes. The metal sheet 3 is a sheet integrated with the terminal 1, and is fixed to the terminal 1 while being held in a rolled state by a metal wire 4 for mounting and fixing. The terminal 1 is made of copper, brass, another copper alloy, or a copper-based composite material, and includes a terminal main portion 1a extending in the axial direction and a connecting piece 1b on one end side in the axial direction of the terminal main portion 1a. The connection piece 1 b has holes 1 c and 1 d used for locking the metal wire 4.

  The electric wire 2 is composed of a stranded wire or a collective wire composed of a plurality of thin wires 2a, and the end 2b of the thin wire 2a is exposed after the enamel insulation coating is removed.

  The metal sheet 3 is made of copper or an alloy containing copper, tin, nickel, zinc, or the like, or made of copper and tin and zinc plated, and the ionization tendency of the material is substantially between copper and aluminum. In the case where the electric wire 2 is aluminum and the terminal 1 is copper, the potential difference between the metals due to the difference in ionization tendency between the two is alleviated so that the electrolytic corrosion can be suppressed. . The metal sheet 3 is a sheet developed radially outward from the terminal main portion 1a before being wound into a roll, and is made of the same material as the terminal 1 and has a metal surface such as tin or solder on the surface thereof. A plating layer is formed.

  In the present invention, the end 2b of the electric wire is placed in a roll shape by the metal sheet 3, and the outer periphery of the metal sheet 3 becomes a connecting tube of the terminal 1, and heat is applied to the terminal 1 during soldering. In addition, when preheating is applied to the outer periphery of the metal sheet 3 and these heats are independently controlled, the metal sheet 3 forms a heat transfer path for transmitting this heat to the wire end 2b. By applying this heat, the internal temperature of the wire end 2b can be maintained at a uniform solder conforming temperature. As a result, the heat applied from the terminal 1 during soldering is efficiently transmitted to the entire wire end portion 2b via the metal sheet 3, whereby flux and solder are transmitted via the heat transfer path formed by the metal sheet 3. The feature is that it is surely introduced.

  As an example of how to apply the heat, the positive electrode and the negative electrode are brought into contact with the terminal 1 or the metal sheet 3 and the current is passed between the two electrodes in that state, so that they are sandwiched between the two electrodes. The terminal 1 and the metal sheet 3 are heated.

  Since the metal sheet 3 forms a heat transfer path in the entire interior of the electric wire end 2b, the heat applied to the terminal 1 is uniformly transferred to the entire electric wire end 2b. The flux and solder are uniformly introduced into the entire wire end 2b. Therefore, the oxide film on the entire surface of the wire end portion 2b is also effectively removed, and a portion where soldering cannot be performed does not easily exist. In addition, as a result of sufficiently uniformizing the heating temperature for soldering, it is not necessary to increase the outside heating temperature to a high temperature state due to the insufficient internal temperature as in the conventional case, and this high temperature state is eliminated. The cause of the disconnection that occurs is also resolved.

  Next, the connection method will be described with reference to FIGS. 1C to 1E.

  First, in a 1st process, as shown in FIG. 1C, the metal sheet 3 integral with the terminal main part 1a is expand | deployed to radial direction outer side. On the other hand, each electric wire end 2b is exposed by removing the enamel or the like coating 2c of each electric wire 2, and the exposed electric wire end 2b is placed on the metal sheet 3 developed radially outward in the same radial direction. Arrange them so that they are scattered. In this case, although it is preferable to arrange | position so that each electric wire edge part 2b may be mutually disperse | distributed at equal intervals to the radial direction outer side, depending on arrangement | positioning processing, it may be in the state with which two or more electric wire edge parts 2b overlapped.

  Next, in the second step, as shown in FIG. 1D, the metal sheet 3 is wound together with the wire end 2b toward the terminal 1 while being rolled in the arrow B1 direction from the outside in the radial direction. In this state, the wire end portion 2b is held between the opposing surfaces of the roll winding portion of the metal sheet 3.

  In the third step, when the winding is completed as shown in FIG. 1E, the metal wire 4 is locked in the holes 1 c and 1 d of the terminal 1 so that the metal sheet 3 maintains its roll winding shape. Thus, the winding roll body 5 integral with the terminal 1 is formed, and the connection structure is completed by introducing the solder H and the flux F into the winding roll body 5.

  In the above connection structure, heat from the terminal 1 is uniformly transferred to the entire wire end 2b through the metal sheet 3, and the entire wire end 2b is uniformly heated, resulting in flux F and melting. The solder F is easily introduced into the entire wire end portion 2b, and soldering can be reliably performed in a state where generation of voids in the solder is suppressed. Moreover, since generation | occurrence | production of a void is suppressed, the various malfunction resulting from a void is eliminated. Also, since voids are reduced and heat conduction is improved, it is not necessary to crimp the terminal and the end of the wire with a large force until then, soldering without damaging the wire and without fear of disconnection. Can do.

  In addition, when a metal plating layer such as tin or solder is formed on the surface of the metal sheet 3, the metal plating layer on the surface of the metal sheet 3 is more easily melted by the high heat applied to the terminals 1 during soldering. A heat transfer path is formed at the top.

  Referring to FIGS. 2A to 2C, a connection structure according to another embodiment of the present invention will be described. As shown in FIG. 2A, the wire end 2b is not directly mounted on the metal sheet 3, but the metal sheet. The metal foil 6 is placed on the metal foil 6, and the wire end 2 b is mounted on the metal foil 6. The surface of the metal foil 6 is plated with metal such as tin, and has a shape capable of holding flux such as a mesh, a punch hole, and unevenness.

  That is, in the first step, the metal foil 6 is mounted on the surface of the metal sheet 3 as shown in FIG. 2B, and then in the second step, the wire end 2b is arranged on the metal foil 6 as shown in FIG. A connection structure can be obtained by winding the metal sheet 3 in the direction of arrow B2 in a roll shape. In the structure according to this embodiment, the time during which the flux can be retained is extended due to the surface shape of the metal foil 6, so that heat for soldering is transmitted well, voids are hardly formed, and mechanical strength is increased. Excellent soldering is performed.

  A connection structure according to still another embodiment of the present invention will be described with reference to FIGS. 3A to 3D.

  First, as shown in (a) and (b) of FIG. 3A, the thickness of the metal sheet 3 expanded radially outward with respect to the terminal main portion 1a is gradually increased from the middle part of the roll toward the radially outer side. It is thin. Here, (a) in FIG. 3A shows a planar configuration, and (b) in FIG. 3A shows a cross-sectional configuration along the CC line in (a) in FIG. 3A. A large number of minute holes 3 a are formed in the metal sheet 3. Similarly, as shown by (a) and (b) in FIG. 3B, the wire end 2b is flattened outward in the radial direction and the thickness of the wire end 2b is gradually increased from the intermediate portion to the radially outer side in the axial direction. It is getting thinner. 3A shows a plan configuration, and FIG. 3B shows a cross-sectional configuration along the line DD in FIG. 3B.

  Thus, a large number of micro holes 3a are formed on the surface of the metal sheet 3, and the flux is easily held by surface tension, heat is transmitted well, voids are hardly formed, and soldering with excellent mechanical strength is achieved. To be done. In addition, the wire end 2b is formed with an axial thickness as described above, and the tip end 2b1 is entangled with each other. Reliability is improved.

  In the case of the above configuration, for the connection, as shown by the arrow B2 in FIG. 3C, the metal sheet 3 is attached to the metal sheet 3 from the outside in the radial direction with the tip end 2b1 of the wire end 2b mounted on the metal sheet 3. When it is formed by being wound into a roll with the wire 4, the cross-sectional configuration thereof is flat at the tip side 2b1 of the electric wire end 2b as shown in FIG. 3D. Therefore, the heat from the metal sheet 3 is more transmitted to the entire tip end 2b1 of the wire end 2b, and good soldering can be performed more efficiently.

  A connection structure according to still another embodiment of the present invention will be described with reference to FIGS. 4A to 4C.

  First, in the first step, as shown in FIG. 4A, a metal sheet 3 having a large number of minute holes is prepared. The metal sheet 3 has a radially outer portion 3b whose axial height is higher than that of the radially inner portion 3c. And in a 2nd process, as shown in FIG. 4B, after arrange | positioning so that the electric wire edge part 2b may be scattered on the metal sheet 3, when the metal sheet 3 is rolled in the arrow B3 direction, it will show in FIG. 4C. Thus, the solder pool 5 is formed on the upper side in the axial direction. FIG. 4C shows the external configuration of the connection structure.

  In the above configuration, when the heat from the terminal 1 is transferred to the metal sheet 3 to uniformly raise the temperature of the entire wire end 2b and then the flux is introduced into the solder pool 5, the flux is at the end of the wire. 2b is introduced uniformly. Next, when solder is introduced into the solder reservoir 5, the solder in the solder reservoir 5 is introduced into the entire wire end portion 2b, and efficient soldering can be performed.

  A connection structure according to still another embodiment of the present invention will be described with reference to FIGS. 5A to 5C. In the first step, as shown in FIG. 5A, a metal sheet 3 that is developed radially outward from the terminal 1 is prepared. The metal sheet 3 is composed of an expanded metal or an equivalent foam metal sheet having a large number of minute holes 3d formed on the surface thereof and extending in the radial direction and the axial direction. The terminal 1 has an axial shape and protrudes upward in the axial direction from the metal sheet 3. In the second step, as shown in FIG. 5B, the metal sheet 3 is moved from the radially outer side with an arrow B4 in a state where the wire end portions 2b are arranged on the metal sheet 3 so as to be spaced at a uniform radial interval. Roll up and roll in as shown. By doing so, the pin-shaped connection structure shown in FIG. 5C can be obtained. In this state, when the outer periphery of the terminal 1 or the metal sheet 3 is heated, then flux is introduced, and then solder is introduced, the wire end 2b in the metal sheet 3 is connected by the solder, and the shape is entirely A pin-shaped body 7 is formed.

  For example, as shown in FIG. 5D, this pin-shaped body 7 is inserted and connected as a male connector into a hole 10 provided in a female connector 9 arranged on a substrate 8 or a hole 11 provided in a pattern on the substrate. Can do.

  In the embodiment described above, when heat is applied to the terminal 1 or the like, the heat is transmitted to the entire inside of the electric wire end 2b by the heat transfer path formed by the roll-shaped metal sheet 3, and as a result, the electric wire end 2b. The flux can be uniformly applied to the entire surface, the oxide film is removed by the flux, and the molten solder comes into contact with the end portion 2b of the wire, so that good soldering without voids is performed.

  Next, a connection structure according to still another embodiment of the present invention will be described with reference to FIGS. 6A to 6D. 6A shows a first step of manufacturing the connection structure, FIG. 6B shows a second step, FIG. 6C shows an external configuration of the connection structure manufactured through these steps, and FIG. 6D shows a cross section of the connection structure shown in FIG. 6C. The configuration is shown. First, FIG. 6A shows a terminal 1 with a connecting cylinder 1e, a metal mesh 10 having a large number of minute holes, and an electric wire 2 composed of a plurality of thin wires scattered in the longitudinal direction of the metal sheet 10. As shown in FIG. 6B, the metal sheet 10 is wound around the wire end 2b in a roll form. This roll winding is the same as described above.

  In this case, the upper end side 10a of the metal sheet 10 extends in a cylindrical shape above the wire end 2b. This cylindrical shape may be a partial cylindrical shape or a complete cylindrical shape. However, the shape of the upper end side 10a is not limited to a cylindrical shape.

  And the metal sheet 10 which wound the electric wire edge part 2b in roll shape is inserted in the insertion hole 1f of the connection pipe | tube 1e of the terminal 1 as shown by the arrow, and the upper end side 10a of the metal sheet 10 is shown in FIG. 6C. It protrudes upward from the insertion hole 1f of the connecting cylinder 1e. The cross-sectional structure in this state is shown in FIG. 6D.

  In this way, the upper end side 10a of the metal sheet 10 is protruded upward from the insertion hole 1f of the connection cylinder 1e. If it does not protrude, the positive electrode and the negative electrode are provided not on the metal sheet 10 but on the outer periphery of the connection cylinder 1e of the terminal 1. The connecting cylinder 1e is heated by flowing a heating current between the pressing electrodes. However, since this is separate from the metal sheet 10, the heat is hardly transmitted to the metal sheet 10. On the other hand, in the case where the metal sheet 10 does not protrude from the connecting cylinder 1e, it is difficult to directly flow the current by sandwiching both the electrodes between the metal mesh 10. Therefore, in the present embodiment, the upper end side 10a of the metal sheet 10 is extended above the electric wire end portion 2b so that the upper end side 10a of the metal sheet 10 is the both electrodes or the upper end side 10a is the terminal 1 together with the both electrodes. The heating current can be made to flow between them. Of course, since the wire end 2b is wound in a roll with the metal sheet 10, the heat is transmitted to the entire wire end 2b using the metal sheet 10 as a heat transfer path. When the flux F is inserted into the insertion hole 1 f, the flux F easily enters the gap between the outer periphery of the wire end 2 b generated by the metal sheet 10 and the inner periphery of the insertion hole 1 f, and a large number of minute particles due to the metal sheet 10. Well maintained in the hole. The oxide film on the surface of the wire end 2b is removed by the flux F. The molten solder to be injected after this removal comes into contact with the wire end portion 2b, and good soldering without voids is performed. As shown in FIG. 6D, the top and bottom of the connection structure are reversed so that flux and solder are not leaked.

  Next, a connection structure according to still another embodiment of the present invention will be described with reference to FIGS. 7A to 7E. FIG. 7A shows the step of attaching the wire end to the metal sheet having a zigzag structure, FIG. 7B shows the cross-sectional configuration of the attached state, FIG. 7C shows the state where the metal sheet with the wire end attached is inserted into the square terminal, and FIG. The connection structure after insertion, FIG. 7E shows a connection structure using round terminals instead of the square terminals. In this embodiment, a zigzag fold is shown as an example of multiple folds. However, the zigzag fold is not limited to this zigzag fold, and includes other multiple folds, for example, various folds such as Guan Yin fold and map fold.

  As shown in FIGS. 7A and 7B, the metal sheet 20 has a zigzag folding structure, and the electric wire end 21 zigzags the zigzag folding portion 20a as shown by an arrow A1 while being inserted between the opposing surfaces of the zigzag folding portions 20a. . Thereby, the electric wire edge part 21 is hold | maintained between the opposing surfaces of each zigzag folding part 20a. A plurality of insertion holes 20c of the electric wire end portion 21 are formed along the longitudinal direction C1 of the zigzag folding portion 20a in the joint 20b of the adjacent zigzag folding portion 20a. In this case, the insertion hole 20c between the pair of adjacent zigzag folded portions 20a adjacent to each other and the insertion hole 20c between the next pair of zigzag folded portions 20a facing each other are shifted in the longitudinal direction C1. This is so that the heat at the time of flux injection and solder connection can be uniformly and uniformly transmitted so that the wire end portion 21 does not overlap in the folding direction and the longitudinal direction C1 as much as possible. The insertion hole 20c can be a flux or solder path. Thus, as shown in FIG. 7C, by inserting the metal sheet 20 folded in the direction indicated by the arrow A2 into the terminal hole 23 of the square terminal 22 together with the wire end portion 21 inserted between the opposing faces of each of the folded portions 20a. The terminal structure shown in FIG. 7D is completed. In this case, a round terminal 24 may be used instead of the square terminal 22 as shown in FIG. 7E. Also in this case, as shown in FIG. 7E, the metal sheet 20 that is folded in a zigzag direction is inserted into one terminal hole 25 of the round terminal 24 as indicated by an arrow A3 together with the wire end portions 21 arranged in the respective zigzag folded portions 20a. Note that the metal sheet 20 that has been folded may be inserted singly into the terminal holes 23 of the square terminals 22 or the terminal holes 25 of the round terminals 24, or may be inserted in a plurality. In this case, the metal sheet 20 side may be soldered before insertion, or may be soldered after insertion. Moreover, although the electric wire edge part 21 of FIG. 7A thru | or FIG. 7E is a round electric wire in embodiment, a flat electric wire may be sufficient.

  Still another embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 8A, the terminal connection structure of this embodiment includes a metal sheet 30 and terminals 40. The metal sheet 30 is a sheet that is spelled as an example of multiple folding, and the zigzag folding forms a plurality of zigzag folding portions 30a. A plurality of wire end portions 31 are inserted from the direction of the arrow A between the zigzag folding portions 30a of the metal sheet 30. The metal sheet 30 is made of copper or an alloy containing copper, tin, nickel, zinc, or the like, or is made of a material in which tin and zinc are plated on copper, and the ionization tendency of the material is substantially intermediate between copper and aluminum. When the wire end 31 is aluminum and the terminal 40 is copper, brass, other copper alloy, or a copper-based composite material, the abrupt potential difference between metals due to the difference in ionization tendency between them is reduced. In this way, electric corrosion can be suppressed.

  Hereinafter, the assembly of the terminal connection structure will be described. As shown in FIG. 8A, the terminal 40 is disposed below the metal sheet 30 in which the electric wire end portion 31 is inserted between the zigzag folded portions 30a. Here, the terminal 40 includes a terminal main portion 41 extending in the axial direction and a flat connection piece 42 extending in one axial direction of the terminal main portion 41. The connection piece 42 has a connection hole 43. The terminal main portion 41 has a U-shaped cross section from a pair of opposing side wall surfaces 41b and 41b that rise vertically on both sides of the bottom wall surface 41a. The wire end portion 31 is formed of a stranded wire or a collective wire composed of a plurality of fine wires, and the end portion 31 is exposed after the enamel insulation coating is removed.

  Next, as shown in FIG. 8B, the metal sheet 30 in which the wire end portion 31 is inserted between the folded portions 30 a to 30 e is mounted on the bottom wall surface 41 a of the terminal main portion 41.

  Next, as shown in FIG. 8C, flux F is introduced, and then solder H is introduced. When this introduction is completed, both side wall surfaces 41b and 41b of the terminal main portion 41 are bent in the direction indicated by the arrow B as shown in FIG. 8C. As a result of this bending, the zigzag folding portions 30a-30e are pressed and compressed by the bottom wall surface 41a and the both side wall surfaces 41b, 41b of the terminal 41 to complete the terminal connection structure 50 at the end of the wire as shown in FIG. 8D.

1 terminal 1a terminal main part 1b connecting piece 2 electric wire 3, 10, 20 metal sheet

Claims (8)

It is a terminal connection structure of an electric wire end portion that is connected to a terminal by soldering an electric wire end portion in which a plurality of fine wires are stranded or assembled wires,
The terminal has an integral or separate metal sheet, and the metal sheet is interposed in the shape of the heat transfer path at the time of heating performed before introducing flux or solder in the end of the wire. The terminal connection structure of the electric wire end part characterized by this.   2. The structure according to claim 1, wherein the metal sheet is rolled or multi-folded and interposed in an end portion of the electric wire to constitute the heat transfer path.   The structure according to claim 2, wherein the metal sheet is rolled or multiple-folded together with an end of the electric wire from a state where the metal sheet is unfolded integrally with the terminal.   The structure according to claim 2, wherein the metal sheet is inserted into an insertion hole of a connection tube provided in the terminal in the form of the roll or multiple fold.   The structure according to claim 4, wherein the metal sheet is rolled and an upper end side thereof protrudes from an insertion hole of the connection cylinder.   The structure according to claim 2, wherein the metal sheet is multiple-folded and holes for inserting the end portions of the electric wires are formed at predetermined intervals at joints between the multiple fold portions.   The structure according to any one of claims 1 to 6, wherein the metal sheet has a shape capable of holding a flux such as a mesh, a hole, and an unevenness.   The above metal sheet is made of copper alone, or an alloy containing tin, nickel, zinc, etc. with respect to copper, or copper plated with tin and zinc as a material, and the ionization tendency of the material. The structure according to any one of claims 1 to 7, characterized in that is approximately in the middle between copper and aluminum.

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