JP2009009736A - Terminal connection structure to aluminum wire - Google Patents

Abstract

An object of the present invention is to provide a terminal connection structure to an aluminum electric wire that suppresses the progress of contact corrosion of different metals, ensures high connection reliability, is excellent in workability, and can be configured at low cost.
A short copper made by covering a conductor terminal of an aluminum electric wire 12 formed by coating a conductor made of aluminum or an aluminum alloy with an insulator, and a conductor made of copper or a copper alloy with an insulator. The connection structure 10 is configured such that the conductor end 22a of the electric wire 14 is connected, the connection portion 16 is covered with the insulator 18, and the terminal 20 made of copper or a copper alloy is crimped to the conductor other end 22b of the copper electric wire 14. . The conductor terminal 36 of the aluminum wire 12 and the conductor end 22a of the copper wire 14 can be connected by a method such as ultrasonic welding, cold welding, brazing or the like. Moreover, it can also connect via an electroconductive strip | belt-shaped member, a cylindrical member, etc. The insulator 18 covering the connecting portion 16 is preferably a heat shrinkable tube.
[Selection] Figure 1

Description

  The present invention relates to a terminal connection structure to an aluminum electric wire, and more particularly to a terminal connection structure to an aluminum electric wire that is suitably used for wiring to a vehicle such as an automobile.

  2. Description of the Related Art Conventionally, copper wires that are excellent in characteristics such as conductivity and strength are often used as wires that are wired in vehicles such as automobiles. In general, a copper electric wire is formed by coating a conductor made of copper or a copper alloy with an insulator, and a terminal for connecting to a device or the like is crimped and connected to the end of the electric wire.

  In recent years, in light of the need to reduce vehicle weight to improve fuel economy as a measure against global warming, abundant resources to guarantee stable supply, and recyclability such as easy separation from iron, automobiles, etc. The demand for the use of aluminum wires using aluminum or an aluminum alloy as a conductor material is increasing for the wires wired in the vehicle.

  However, aluminum easily forms an oxide film on its surface, and has a large creep and stress relaxation. Therefore, when an aluminum electric wire is used, the contact load tends to decrease with time in the electric wire crimping portion formed by the electric wire conductor and the terminal made of copper or copper alloy. As a result, the contact area between the conductor and the terminal is reduced and the contact resistance is increased, so that there is a problem that it is difficult to form a crimp connection part with high connection reliability by a method similar to that of a copper electric wire.

  Therefore, in order to solve such problems, various proposals have been made, such as a proposal relating to the shape of a crimp terminal to be crimped to an aluminum electric wire and a proposal relating to the crimping condition of the terminal to the aluminum electric wire.

  For example, Patent Document 1 discloses a crimp terminal in which an uneven portion is formed on the inner surface of a U-shaped wire crimping portion that compresses and grips an aluminum electric wire, and the relationship between the developed width and the plate thickness of the wire crimping portion is defined. Is disclosed.

  Patent Document 2 discloses that the compression ratio (area reduction) of the conductor portion of the aluminum wire by the wire barrel of the terminal to be crimped to the aluminum wire is the aluminum wire conductor cross-sectional area of the crimp portion / the aluminum wire conductor portion before crimping. A terminal crimping structure to an aluminum electric wire within a range of 50 to 70% in terms of a cross-sectional area is disclosed.

  Further, in Patent Document 3, a cylindrical lining having a large number of holes is placed inside a cap-shaped crimp terminal that is crimped to an aluminum electric wire, and a conductor terminal of the aluminum electric wire is inserted into the inner lining. A method of crimping with a specially shaped tool in a state in which no is exposed is disclosed. According to this crimping method, a metal bond by cold welding can be formed between the strands or between the electric wire and the terminal, and it is said that the connection reliability is excellent.

JP-A-57-87082 JP 2005-174896 A US Pat. No. 3,955,044

  However, when an aluminum electric wire is crimped and connected to a terminal made of copper or a copper alloy, dissimilar metals come into contact with each other, so that corrosion of aluminum is easily promoted. That is, if moisture such as rain water or condensation is present in this contact portion, there is a problem that the contact resistance of the wire crimping portion increases due to the formation of a local battery and the dissimilar metal contact corrosion in which aluminum is eluted as a cation. It was.

  In patent document 1 and patent document 2, the contact part of a crimp terminal and an aluminum electric wire is exposed, the dissimilar metal contact corrosion mentioned above is easy to advance, and high connection reliability is ensured between a crimp terminal and an aluminum electric wire. It is difficult to do.

  On the other hand, in Patent Document 3, since the conductor terminal of the aluminum electric wire is not exposed and is sealed and crimped in the crimp terminal, the progress of the dissimilar metal contact corrosion is suppressed. However, in order to seal the conductor terminal in this way, special parts and tools are required, and there is a problem that the work of inserting the parts is complicated and workability is poor.

  As for electric wires for automobiles, crimp terminals having various shapes and sizes have been developed so far for copper electric wires. These guarantee the connection reliability by enormous performance evaluation including endurance tests at the development stage and long-term use results in actual vehicles. Therefore, when replacing the conductor material of the wire with aluminum and connecting it directly to the terminal, optimize the crimping conditions, confirm the connection reliability, and modify the terminal as necessary. It is anticipated that it will have to be done, and it takes a lot of time and money.

  The problem to be solved by the present invention is to prevent the progress of dissimilar metal contact corrosion, ensure high connection reliability, excellent workability, and a terminal connection structure to an aluminum wire that can be configured at low cost. Is to provide.

  In order to solve the above problems, the terminal connection structure to an aluminum electric wire according to the present invention is applied to a conductor terminal of an aluminum electric wire formed by coating an insulator on a conductor made of aluminum or an aluminum alloy, to a conductor made of copper or a copper alloy. One end of a conductor of a short copper wire coated with an insulator is connected, the connecting portion is covered with an insulator, and a terminal made of copper or a copper alloy is crimped and connected to the other end of the conductor of the copper wire. Is the gist.

  In this case, it can be shown suitably that one end of the conductor of the copper electric wire is connected to the conductor terminal of the aluminum electric wire by ultrasonic welding.

  Moreover, it can show suitably connecting the conductor end of the said copper electric wire to the conductor terminal of the said aluminum electric wire by cold welding.

  Moreover, it can show suitably that the conductor end of the said copper electric wire is connected to the conductor terminal of the said aluminum electric wire by brazing.

  Furthermore, it can be shown suitably that one end of the conductor of the copper electric wire is connected to the conductor terminal of the aluminum electric wire via a conductive connecting member.

  At this time, as the conductive connecting member, a conductive belt-like member can be suitably shown, and the conductor terminal of the aluminum electric wire and one end of the conductor of the copper electric wire are bundled with the conductive belt-like member, and each electric wire It can be shown suitably that the conductor end of the copper wire is connected to the conductor end of the aluminum wire by crimping the conductor end of the wire and the strip-shaped member.

  Moreover, as a conductive connection member, a conductive cylindrical member can be suitably shown, and the conductor terminal of the aluminum electric wire and the conductor one end of the copper electric wire are respectively inserted from both ends of the conductive cylindrical member. It is possible to suitably show that one end of the conductor of the copper electric wire is connected to the conductor end of the aluminum electric wire by crimping the conductor end of each electric wire and the cylindrical member.

  And it is desirable for the said strip | belt-shaped member or the said cylindrical member to have an uneven | corrugated shape in the surface which contact | connects the conductor of the said copper electric wire, and the conductor of the said aluminum electric wire.

  Furthermore, the insulator covering the connecting portion is preferably a heat shrinkable tube.

  The terminal connection structure to the aluminum electric wire according to the present invention is formed by connecting a short copper electric wire to the aluminum electric wire and connecting a terminal made of copper or a copper alloy to the terminal of the copper electric wire connected to the aluminum electric wire. That is, since a copper electric wire is crimped to the terminal, there is no possibility that the problem of dissimilar metal contact corrosion occurs in the electric wire crimping portion. Moreover, in the wire crimping part, high connection reliability can be ensured by utilizing the terminal performance evaluation and the use results cultivated so far. Accordingly, it is possible to reduce enormous time and cost by optimizing the crimping conditions, confirming the connection reliability, and modifying the terminals for the terminal crimping part. Furthermore, since no special parts or tools are required for crimping the terminals, workability is also good.

  In addition, aluminum wire and copper wire are connected, but this connection part is covered with an insulator, so water and water vapor are prevented from entering the connection part from the outside, and contact with different metals occurs. Is suppressed.

  In this case, since the wires connecting the aluminum wires and the copper wires are connected to each other, dissimilar metal joining techniques such as ultrasonic welding, cold welding and brazing can be easily applied. And the connection part excellent in intensity | strength and electrical connection reliability can be formed by these joining methods.

  Moreover, since it is a connection between electric wires, even if it uses electroconductive connection members, such as an electroconductive strip | belt-shaped member and an electroconductive cylindrical member, electric wires can be firmly connected.

  At this time, when the band-shaped member or the cylindrical member has a concavo-convex shape on the surface in contact with the conductor of the copper electric wire and the conductor of the aluminum electric wire, when the electric wire is crimped, aluminum or copper as a conductor material is used. Is deformed plastically due to the uneven shape, the surface area is enlarged, the oxide film on the surface is broken, the clean metal surface is exposed, and the wires are cooled between the wires of the wires or between the wire conductor and the conductive strip or cylindrical member. Formation of metal bonds by inter-pressure welding is facilitated. Thereby, the connection part which was further excellent in intensity | strength and electrical connection reliability can be formed.

  And since the structure of the connection part between the wires is very simple, the connection part can be easily air-tightly covered with the heat shrinkable tube, and water or water vapor is reliably prevented from entering the connection part from the outside. be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are schematic views showing a terminal connection structure to an aluminum electric wire according to the first embodiment of the present invention. FIG. 3 is a schematic diagram showing a copper wire pigtail in which a terminal is connected to a copper electric wire. 4 to 6 and 12 are schematic views showing an example of a method of connecting a conductor terminal of an aluminum electric wire and a conductor end of a copper electric wire. 7 to 11 are schematic views showing an example of the concavo-convex shape formed on the surface of the belt-shaped member or the inner surface of the cylindrical member.

  As shown in FIG. 1, a terminal connection structure 10 to an aluminum wire according to an embodiment of the present invention connects one end of a short copper wire 14 to a conductor end of an aluminum wire 12 and insulates this connection portion 16. The body 18 is covered and a terminal 20 made of copper or a copper alloy is crimped and connected to the other end of the conductor of the copper wire 14.

  The copper electric wire 14 connected to the conductor terminal of the aluminum electric wire 12 is configured by covering a conductor 22 made of copper or a copper alloy with an insulator 24. A short copper wire 14 is used. The short length may be a length that can be connected to both the terminal 20 and the aluminum electric wire 12 (a length that is secured to connect to both ends), and a specific range of length. It is not limited to. However, since it is attached to the aluminum electric wire 12, the length of the attached wire may be sufficient.

  Both ends of the copper wire 14 are stripped of the insulator 24 to expose the conductor 22, one end of the conductor 22 a is connected to the conductor of the aluminum wire 12, and the other end 22 b of the conductor is connected to the terminal 20. The conductor 22 constituting the copper wire 14 may be a single wire or a stranded wire formed by twisting a plurality of strands. The conductor cross-sectional area, insulator material, insulator thickness, wire diameter, etc. are not particularly limited, and generally used copper wires can be used. In addition, since the copper electric wire 14 is connected with the aluminum electric wire 12, it is preferable that it has the same conductor cross-sectional area and electric wire diameter as the aluminum electric wire 12. FIG.

  The terminal 20 is obtained by punching (pressing) a plate material made of copper or a copper alloy into a developed shape of the terminal and then bending it. What is shown is a so-called female terminal, which has a connecting portion 26 formed in a rectangular tube shape on the distal end side connected to the counterpart terminal, and an electric wire is crimped and connected to the proximal end side of the connecting portion 26. A crimping portion 28 is formed to extend. The crimping portion 28 includes a pair of wire barrels 30a and 30b for crimping and connecting a wire conductor, and a pair of insulation barrels 32a and 32b for crimping an insulator, and is connected to the wire terminal by caulking them. The shape of the terminal 20 is not particularly limited, and may be a so-called female terminal or male terminal. Moreover, the terminal generally used is applicable.

  The connection between the terminal 20 and the end of the copper wire 14 can be performed by caulking which is usually performed. Rather than using an aluminum wire as the wire to be connected to the terminal 20, a copper wire that has a proven connection reliability based on a huge performance evaluation and usage record is used. Therefore, the reliability is high based on the results cultivated so far. Connection is possible. In addition, since it is not necessary to perform enormous performance evaluations and tests at the time of use, the development cost can be reduced and the cost is excellent.

  When the terminal 20 is connected to the short copper wire 14, the copper wire pigtail 34 shown in FIG. 3 is formed. The copper wire pigtail 34 and the aluminum wire 12 are connected.

  The aluminum electric wire 12 connected to the copper wire pigtail 34 is configured by covering a conductor 36 made of aluminum or an aluminum alloy with an insulator 38. The end portion of the aluminum wire 12 is stripped of the insulator 38 to be connected to the copper wire 14, and the conductor 36 is exposed. The conductor 36 constituting the aluminum electric wire 12 may be a single wire as in the case of the copper electric wire 14 or may be a stranded wire formed by twisting a plurality of strands. The conductor cross-sectional area, insulator material, insulator thickness, wire diameter, etc. are not particularly limited.

  The conductor terminal 36 of the aluminum wire 12 and the conductor end 22a of the copper wire 14 can be connected by a joining method such as ultrasonic welding, cold welding, brazing or the like. When the aluminum wire 12 and the copper wire 14 are connected, a connection portion (splice portion) 16 is formed. Since the wires are connected to each other, the connection structure is simplified.

  Ultrasonic welding can be performed using an ultrasonic welding apparatus often used for ultrasonic welding between dissimilar metal materials. For example, as shown in FIG. 4A, the conductor terminal 36 of the aluminum wire 12 exposed by peeling the insulator (insulating coating) 38, and the copper wire 14 similarly exposed by peeling the insulating coating 24 are exposed. This can be done by bringing a welding horn 42 into contact with the conductor one end 22a bundled on the anvil 40 and vibrating the horn 42 in the horizontal direction. As the horn 42 vibrates at high frequency, the strands of the conductors 22a and 36 are heated by friction, and the strands are joined to each other. As shown in FIG. The conductor end 22a of the electric wire 14 is connected.

  According to the ultrasonic welding method, even if there is an oxide film or dirt on the metal surface before welding, they are destroyed and scattered by the initial vibration, so a special surface treatment (cleaning treatment) is required for welding. It can be omitted. Moreover, different metals can be easily joined. Also, flux such as solder and brazing material is unnecessary, and simple joining can be performed.

  Cold welding can be performed using a cold welding apparatus that is often used to cold-weld a conductor end of a wire and connect the wires. There is a handy type of cold pressure welding apparatus for connecting electric wires.

  For example, as shown in FIG. 5A, the cold pressure welding apparatus includes a die 44 composed of four die pieces 44a, 44b, 44c, and 44d, and a pair of V blocks 46a and 46b sandwiching the die 44. Are arranged opposite to each other, and fingers 48 for holding the electric wires are arranged opposite to each other across the die 44 in the electric wire insertion direction perpendicular to the direction in which the pair of V blocks 46a and 46b are opposed to each other. The four die pieces 44a, 44b, 44c, and 44d are connected to each other by a spring, and the die pieces adjacent to each other are arranged at a predetermined interval by the repulsive force. Is formed. The V blocks 46a and 46b are movable in the opposing direction and press the dice 44.

  In order to perform the cold welding, as shown in FIG. 5B, first, similarly to the conductor terminal 36 of the aluminum wire 12 exposed by peeling the insulating coating 38, the insulating coating 24 is peeled and exposed. The conductor end 22a of the copper wire 14 is inserted into the die hole 50 of the die 44 so as to be inserted, and the aluminum wire 12 and the copper wire 14 are held by the fingers 48, respectively. Next, the V blocks 46a and 46b are moved in the opposite direction to press the die 44, and the wire conductors 22a and 36 are held by the die hole 50 in the wire insertion direction. At this time, the die hole 50 in the direction orthogonal to the electric wire insertion direction is in an open state.

  When the V blocks 46a and 46b are continuously moved in the opposite direction and the die 44 is further pressed, as shown in FIG. 5C, the respective die pieces 44a to 44d are inclined surfaces 52 of the V blocks 46a and 46b that contact each other. , The die hole 50 in the direction perpendicular to the electric wire insertion direction is closed, the butted surfaces of the electric wire conductors 22a and 36 are compressed and joined, and the conductor terminal 36 of the aluminum electric wire 12 and the conductor of the copper electric wire 14 are joined. One end 22a is connected.

  According to the cold welding method, an intermetallic compound is hardly generated, and therefore, it is suitable for joining dissimilar metals as in the present invention.

  Further, the cold welding can be performed not only when directly joining the electric wires using a cold welding apparatus, but also using a conductive connecting member. Examples of the conductive connection member include a conductive belt-shaped member and a conductive cylindrical member.

  The band-shaped member is formed by processing a conductive thin plate material such as a metal such as tin-plated copper or copper alloy into a length and width suitable for bundling a conductor terminal of an aluminum wire and a conductor end of a copper wire. Formed. The thickness of the belt-shaped member is not particularly limited, but may be a thickness that can be easily wound around the connection portion.

  As shown in FIGS. 6A to 6C, the conductor terminal 36 of the aluminum electric wire 12 and the conductor end 22a of the copper electric wire 14 are bundled by a conductive belt-like member 54, and the conductor terminals 22a and 36 of each electric wire are connected. By crimping the belt-like member 54, the conductor terminal 36 of the aluminum electric wire 12 and the conductor end 22a of the copper electric wire 14 can be connected.

  It is preferable that the strip-shaped member 54 has a concavo-convex shape on the surface in contact with the conductor 22 a of the copper electric wire 14 and the conductor 36 of the aluminum electric wire 12. When the uneven shape is formed on the surface of the band-shaped member 54, when the conductor terminals 22a and 36 and the band-shaped member 54 are pressure-bonded, the copper or aluminum of the conductor material is plastically deformed by the uneven shape. When the conductive material is plastically deformed, the surface area is enlarged, the surface oxide film is broken, and a clean metal surface is exposed. If it does so, it will become easy to accelerate | stimulate the metal bond formation by cold pressure welding between the strands of an electric wire or between the electric wire conductors 22a and 36 and the electroconductive strip | belt-shaped member 54. FIG. Thereby, the connection part which was further excellent in intensity | strength and electrical connection reliability can be formed. It is preferable to use a material harder than the electric wire conductor for the belt-like member 54 so that the uneven shape that promotes the exposure of the clean metal surface due to plastic deformation of the electric wire conductor does not collapse. In that case, the plastic deformation of the belt-shaped member 54 itself and the destruction of the surface oxide film are likely to be insufficient. Therefore, the surface of the belt-shaped member 54 is preferably plated with tin that is soft and easy to break the oxide film.

  As an uneven | corrugated shape formed in the surface of the strip | belt-shaped member 54, as shown to Fig.7 (a), for example in the length direction of the strip | belt-shaped member 54 used as the direction orthogonal to the axial direction of the electric wire conductor bundled by the strip | belt-shaped member 54 A plurality of grooves 56 can be recessed in parallel along the serration, and a serration formed by forming protrusions 58 between adjacent grooves can be shown. When the AA cross section of the belt-like member 54 is viewed, as shown in FIG. 7B, a so-called serrated groove in which the concave portion 56 and the convex portion 58 are repeated is formed. The edge part of the convex part 58 formed by the adjacent groove | channel is formed in the angle and the depth of the grade which does not cut | disconnect a conductor strand, when crimping the conductor terminal 22a, 36 and the strip | belt-shaped member 54. FIG.

  Further, as shown in FIG. 8, it is possible to show a structure in which a plurality of grooves 56 are recessed in parallel in an oblique direction with respect to the axial direction of the electric wire conductor bundled by the belt-like member 54. Further, as shown in FIG. 9, a plurality of grooves 56 are provided in parallel in both the oblique direction with respect to the axial direction of the electric wire conductor bundled by the belt-like member 54 and the oblique direction intersecting with this. Crossed mesh serrations. In addition, as shown in FIG. 10, a plurality of each of the length direction of the band-shaped member 54 that is a direction orthogonal to the axial direction of the wire conductor bundled by the band-shaped member 54 and the width direction orthogonal to the length direction It is possible to show a mesh-like serration in which the groove 56 is recessed in parallel and intersects.

  If serrations are formed in an oblique direction with respect to the axial direction of the wire conductor, the conductor terminals 22a and 36 may be squeezed with a hand when the belt-like member 54 and the conductor terminals 22a and 36 are caulked. Since it is stretched while being twisted in the length direction, it is likely to undergo large plastic deformation.

  The uneven shape can be a through-hole instead of a groove.

  Examples of the cylindrical member include those obtained by bending a conductive thin plate material such as metal exemplified by tin-plated copper or copper alloy into a cylindrical shape or a rectangular tube shape, and a metal pipe. As shown in FIG. 11, the cylindrical member 60 has an uneven shape on the inner side surface that is a surface in contact with the conductor end 22 a of the copper wire 14 and the conductor terminal 36 of the aluminum wire 12, similarly to the belt-like member 54. It is preferable.

  As shown in FIGS. 12A to 12C, the conductor terminal 36 of the aluminum wire 12 and the conductor end 22a of the copper wire 14 are respectively inserted from both ends of the tubular member 60 and arranged to face each other. By crimping the conductor terminals 22a, 36 of the electric wire and the tubular member 60, the conductor terminal 36 of the aluminum electric wire 12 and the conductor end 22a of the copper electric wire 14 can be connected.

  The component orthogonal to the wire conductor axial direction of the groove or the through hole is also effective for suppressing an increase in contact resistance due to aluminum creep or stress relaxation. Since the volume of metal is generally hardly changed, the wire conductor to be crimped to the belt-like member 54 or the cylindrical member 60 is stretched in the conductor axis direction and reduced in the conductor axis direction when the cross-sectional area is reduced. The stress is left. In the case of aluminum, this stress disappears with time and tends not to shrink. In the case where the belt-like member 54 or the cylindrical member 60 does not have a groove or a through hole, or in the case of a groove parallel to the electric wire conductor axial direction, only the belt-like member 54 or the cylindrical member 60 tries to shrink in the electric wire conductor axial direction. It becomes easy to separate from the electric wire conductor 36, and the contact load and the contact area are reduced, and the contact resistance is likely to increase due to oxidation of the surface of the separated aluminum electric wire conductor 36. The component perpendicular to the wire conductor axial direction of the groove and the through hole can also be expected to have a “washing” function that prevents separation of the belt-like member 54 or the tubular member 60 and the aluminum wire conductor 36.

  When performing brazing, the conductor terminal 36 of the aluminum electric wire 12 and the conductor end 22a of the copper electric wire 14 are connected using a general brazing material. The brazing material includes soft brazing (solder) having a melting temperature of 450 ° C. or lower and hard brazing having a melting temperature of 450 ° C. or higher, and either a brazing material of soft brazing or hard brazing may be used. Use a brazing material with a melting point lower than that of the metal to be joined, such as aluminum, aluminum alloy, copper, and copper alloy, and melt this between the joining surfaces so that the base material does not melt. Infiltrate and join. According to brazing, dissimilar metal materials can be joined with high accuracy, and the joining temperature can be freely selected according to the melting temperature of the brazing material.

  Since the connection portion (splice portion) 16 between the conductor terminal 36 of the aluminum wire 12 and the conductor end 22a of the copper wire 14 is in contact with a different metal, the presence of water tends to cause a different metal contact corrosion. Therefore, it is covered with an insulator 18 so as to be airtight so that water vapor or the like does not enter from the outside. Since the wires are connected to each other, the structure of the connecting portion 16 is simple. Therefore, when the terminal and the wire conductor are in contact with different metals, the connecting portion 16 is covered with the insulator 18 as compared with the case where a complicated shape such as a terminal is sealed to cover the contact portion. Cheap.

  The insulator 18 that covers the connection portion 16 between the aluminum wire 12 and the copper wire 14 is formed in a tube shape (cylindrical shape) and has an inner diameter that is approximately the same size as the outer diameter of the insulators of both wires. The length is formed so as to completely cover the connection portion 16 between the aluminum wire 12 and the copper wire 14, and the end portions are disposed on the outer periphery of the insulating coatings 38 and 24 of the aluminum wire 12 and the copper wire 14.

  As the insulator material, for example, an insulating rubber material having rubber elasticity or an insulating resin material having heat shrinkability can be used. When a rubber elastic material is used as the insulator material, the inner diameter is slightly smaller than the outer diameter of the insulating coatings 38 and 24, and the connecting portion 16 between the aluminum electric wire 12 and the copper electric wire 14 is covered airtightly using rubber elasticity. And good. When a heat-shrinkable material is used as the insulator material, the inner diameter is slightly larger than the outer diameter of the insulating coatings 38, 24, and the connecting portion 16 between the aluminum electric wire 12 and the copper electric wire 14 is completely covered, and then heated. It is preferable that the connection portion 16 is covered in an airtight manner by contracting. A heat-shrinkable tube is particularly preferable because it is easy to cover hermetically.

  The insulator 18 is not limited to a tube shape, for example, an adhesive is applied to at least one surface of a base material formed in a tape shape, or a sheet shape or the like. It may be. Further, the thickness of the insulator 18 is not particularly limited.

  Note that the connection order is not particularly limited. After connecting the copper wire 14 and the aluminum wire 12 first, the terminal 20 may be connected to the end of the copper wire 14.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

It is a disassembled perspective view showing the terminal connection structure to the aluminum electric wire which concerns on one Embodiment of this invention. It is a schematic diagram showing the terminal connection structure to the aluminum electric wire which concerns on one Embodiment of this invention. It is a schematic diagram showing a copper wire pigtail. It is a schematic diagram showing the process of connecting the conductor terminal of an aluminum wire and the conductor end of a copper wire by ultrasonic welding. It is a schematic diagram showing the process of connecting the conductor terminal of an aluminum electric wire and the conductor end of a copper electric wire by cold pressure welding. It is a schematic diagram showing the process of connecting the conductor terminal of an aluminum electric wire, and the conductor end of a copper electric wire with an electroconductive strip | belt-shaped member. It is a schematic diagram showing an example of the uneven | corrugated shape formed in a strip | belt-shaped member surface. It is a schematic diagram showing an example of the uneven | corrugated shape formed in a strip | belt-shaped member surface. It is a schematic diagram showing an example of the uneven | corrugated shape formed in a strip | belt-shaped member surface. It is a schematic diagram showing an example of the uneven | corrugated shape formed in a strip | belt-shaped member surface. It is a schematic diagram showing an example of the uneven | corrugated shape formed in a cylindrical member inner surface. It is a schematic diagram showing the process of connecting the conductor terminal of an aluminum electric wire, and the conductor end of a copper electric wire with a conductive cylindrical member.

Explanation of symbols

10 Terminal connection structure to aluminum wire 12 Aluminum wire 14 Copper wire 16 Connection part (splice part)
18 Insulator 20 Terminal 22 Copper Wire Conductor 36 Aluminum Wire Conductor (Terminal)

Claims (9)

  Connect one end of a short copper wire conductor with a conductor made of copper or a copper alloy to a conductor terminal of an aluminum wire made by coating an insulator with a conductor made of aluminum or an aluminum alloy, and connect A terminal connection structure to an aluminum electric wire, wherein the portion is covered with an insulator and a terminal made of copper or a copper alloy is crimped to the other end of the conductor of the copper electric wire.   The terminal connection structure to an aluminum electric wire according to claim 1, wherein one end of the copper electric wire is connected to a conductor terminal of the aluminum electric wire by ultrasonic welding.   The terminal connection structure to an aluminum electric wire according to claim 1, wherein one end of the conductor of the copper electric wire is connected to a conductor terminal of the aluminum electric wire by cold welding.   The terminal connection structure to an aluminum electric wire according to claim 1, wherein one end of the conductor of the copper electric wire is connected to a conductor terminal of the aluminum electric wire by brazing.   The terminal connection structure to an aluminum electric wire according to claim 1, wherein one end of the conductor of the copper electric wire is connected to a conductor terminal of the aluminum electric wire via a conductive connecting member.   The conductor end of the aluminum electric wire and the conductor end of the copper electric wire are bundled with a conductive band-like member, and the conductor end of each electric wire and the band-like member are pressure-bonded to the conductor end of the aluminum electric wire. The terminal connection structure to the aluminum electric wire according to claim 5, wherein one end of the conductor of the copper electric wire is connected via a wire.   The conductor terminal of the aluminum wire and the conductor one end of the copper wire are inserted from both ends of the conductive cylindrical member and arranged to face each other, and the conductor terminal of each electric wire and the cylindrical member are crimped, The terminal connection structure to an aluminum electric wire according to claim 5, wherein one end of the conductor of the copper electric wire is connected to a conductor terminal of the aluminum electric wire via the cylindrical member.   The said strip | belt-shaped member or the said cylindrical member has an uneven | corrugated shape in the surface which contact | connects the conductor of the said copper electric wire, and the conductor of the said aluminum electric wire, The aluminum electric wire of Claim 6 or 7 characterized by the above-mentioned. Terminal connection structure.   The terminal connection structure to an aluminum electric wire according to any one of claims 1 to 8, wherein the insulator covering the connection portion is a heat shrinkable tube.

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