JP2005050736A - Method of manufacturing terminal crimping structure to aluminum wire and aluminum wire with terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide crimping terminal with a sufficient terminal retaining force while securing electrical continuity of a terminal connecting part with an aluminum wire when the terminal is press bonded to the aluminum wire. <P>SOLUTION: In a terminal crimping structure for the aluminum wire, for connecting the terminal 10 to the aluminum wire 1, an insulation barrel 15 for crimping of covered part of the aluminum wire, a crimping barrel for continuity of the aluminum wire 12 and a crimping barrel for retaining the aluminum wire 13 are provided. The crimping barrel for retaining the aluminum wire is formed in a position adjacent to the insulation barrel. The crimping barrel for aluminum wire continuity is also formed on the opposite side of the insulation barrel, in regard to the crimping barrel for retaining the aluminum wire. In the state where both crimping barrels are press bonded to the aluminum wire, the crimping barrel for aluminum wire conduction is press bonded to the aluminum wire at a height that is lower than the crimping barrel for retaining the aluminum wire, viewed in the direction of the terminal crimping. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a crimping structure for a terminal to be used by being crimped to an aluminum electric wire and mounted in a connector housing, and a method for manufacturing the terminal-equipped aluminum electric wire.

  Conventionally, a copper wire is generally used as a wire harness routed in an automobile, and an aluminum wire having poor properties (physical properties) such as conductivity and strength is difficult to use and has not been used so much. However, in recent years, there has been an increasing demand for the use of aluminum wires in view of weight reduction and recyclability of vehicles. An electrical connector is generally used for connecting such wire harnesses to each other or a vehicle harness and a wire harness. Such an electrical connector is composed of connector housings that are fitted to each other and a plurality of crimp terminals that are inserted and fitted into these connector housings and crimped and connected to wires of a wire harness.

  Here, the crimping | compression-bonding process at the time of temporarily crimping | bonding the said terminal to an aluminum electric wire based on the conventional terminal crimping structure to a copper electric wire is demonstrated. FIG. 12 shows a conventional terminal that is crimped to a copper wire. As shown in FIG. 12, the terminal 80 includes an inter-terminal connection portion 80a and an electric wire connection portion 80b. The electric wire connection portion 80b includes a wire barrel 81 having a certain length in the terminal longitudinal direction, It is comprised from the insulation barrel 85 adjoined to the coating | coated part of a copper electric wire adjacently. FIG. 13 is a diagram illustrating a process of crimping such a terminal 80 to the aluminum electric wire 1 instead of the copper electric wire. As is apparent from the figure, a stepped crimping jig 180 provided with terminal crimping portions 181 and 185 respectively corresponding to the wire barrel 81 and the insulation barrel 85 of the terminal 80 is used for the terminal crimping. The crimping jig 180 has an inverted V-shape when viewed in the longitudinal direction of the terminal to be crimped, and an M-shaped crimp groove is formed so that the tip bends (curls) in the direction of caulking the barrel tip. . Then, the crimping jig 180 is moved from the upper side to the lower side of the terminal 80 (see the arrow X indicating the terminal crimping direction in the drawing), and the terminal 80 is moved along the inverted V-shaped groove surface of the jig 180. The barrels 81 and 85 are deformed (see FIGS. 13B and 13C). Since the inverted V-shaped groove surface of the jig 180 has an M-shaped inverted V-shaped tip, the ends of the barrels 81 and 85 are respectively pressed by further pressing the jig 180 toward the terminal 80. It is curled (bent) toward the aluminum electric wire 1 in the direction of caulking the barrel tip. As a result, the barrels 81 and 85 are pressure-bonded to the conductor portion 1a and the covering portion 1b of the aluminum electric wire 1 (see FIGS. 13C and 14A). When the terminal 80 is firmly crimped to the aluminum electric wire 1, the crimping jig 180 is raised in the Y direction in the drawing to complete the terminal crimping process.

  In addition, a wire barrel is not comprised from a single barrel like the above-mentioned terminal 80, but some terminals which have the structure comprised from the some barrel are also known (patent document 1 thru | or patent document 3). reference.).

Japanese Utility Model Publication No. 6-36215 (page 4-5, FIG. 2) Japanese Utility Model Publication No. 6-36216 (page 4-5, FIG. 2) JP-A-11-297375 (page 3-4, FIG. 1)

  In the conventional method for connecting a copper wire and a terminal, the terminal 80 and each stranded wire constituting the copper wire are not in contact with each other, but the terminal has no particular problem in terms of mechanical and electrical characteristics of the copper wire. Connected to copper wire.

  However, an aluminum electric wire has characteristics such that mechanical strength and fusing temperature are lower than that of a copper electric wire, and each stranded wire constituting the electric wire easily forms an oxide film. For this reason, current flows only through a specific stranded wire, and concentrated resistance is likely to occur, and there is a concern about occurrence of fusing or poor conduction due to such concentrated resistance.

  Specifically, when the oxide film of each stranded wire is destroyed and the terminal is strongly crimped to the aluminum wire so that the wire barrel and the wire barrel are in close contact with each other, the electrical continuity characteristics can be applied to environmental tests such as a thermal cycle. However, due to excessive stress acting on the terminal crimping portion, the wire holding force is extremely reduced, and the connection structure between the terminal and the wire may be inappropriate.

  FIG. 14 is a plan view (FIG. 14 (a)) and side views (FIGS. 14 (a) and (b)) showing a state in which the terminal 80 is crimped to such an aluminum electric wire 1. FIG. In FIG. 14B, the crimping portion of the wire barrel 81 has the same height as the crimping of the conventional copper wire when viewed in the terminal crimping direction with respect to the conductor portion 1a of the aluminum wire 1 (high in the drawing). See He). Moreover, FIG.14 (c) has shown the state which crimped | bonded the terminal 80 to the aluminum electric wire 1 with the big compression rate (area reduction rate) compared with FIG.14 (b), compared with FIG.14 (b). The height of the crimped terminal 80 is low as seen in the terminal crimping direction (see height Hf in the figure).

  In the same crimping state as the conventional copper wire shown in FIG. 14 (b), there is no problem with the terminal crimping strength (wire holding force), but the oxide film on the surface of each stranded wire of the conductor portion 1a cannot be sufficiently destroyed, In addition, an increase in contact resistance occurs in environmental tests such as a cooling / heating cycle, which is insufficient in terms of electrical conduction characteristics. On the other hand, as shown in FIG. 14 (c), when the terminal 80 is crimped to the aluminum electric wire 1 with a large compression ratio (area reduction), sufficient electrical continuity can be achieved, but the electric wire is affected by a large stress acting on the terminal crimping portion of the electric wire. Holding power is reduced, and terminal crimping strength required for each wire size cannot be obtained.

  The terminals described in Patent Documents 1 to 3 have a configuration in which a plurality of wire barrels are formed in addition to the insulation barrel. However, these wire barrels are individually formed to correspond to the wire diameter of the wire to be crimped, and when applied to aluminum wires of the same diameter, the conductor portion of the aluminum wire has a different compression ratio (reduction). There is no disclosure of a configuration in which pressure bonding is performed at a surface area).

  An object of the present invention is to provide a terminal structure having a necessary terminal crimping strength (wire holding force of a terminal) while ensuring sufficient electrical conduction characteristics between the aluminum wire and the terminal when the terminal is crimped to the aluminum wire. There is.

  In order to solve the above-described problems, a terminal crimping structure to an aluminum electric wire according to the present invention includes an aluminum electric wire conduction crimping barrel and an aluminum electric wire holding crimping barrel in addition to the insulation barrel for aluminum electric wire covering portion crimping. A crimping structure for crimping an aluminum wire to an aluminum wire, a crimp barrel for holding an aluminum wire is formed at a position adjacent to the insulation barrel, and an insulation barrel for the crimp barrel for holding the aluminum wire When the crimp barrel for aluminum wire conduction is formed on the opposite side and both the crimp barrels are crimped to the aluminum wire, the crimp barrel for conducting the aluminum wire is lower than the crimp barrel for holding the aluminum wire when viewed in the terminal crimp direction. Now, it is characterized by being crimped to the aluminum electric wire.

  Since the aluminum wire conduction barrel is crimped at the tip of the wire (inside the terminal) than the aluminum wire holding barrel, even if the terminal crimping strength of the conduction barrel is weak, the terminal and wire are operated by the rear holding barrel. There is no problem with the holding power. In addition, since the electric wire is firmly held by the rear holding barrel, the insulating oxide film of the aluminum electric wire is destroyed and brought into close contact with the front by pressing the conducting barrel with a large compression ratio (area reduction rate). Thus, sufficient electrical characteristics can be obtained between the terminal and the aluminum electric wire.

  Moreover, the terminal crimping structure to the aluminum electric wire according to claim 2 of the present invention is the terminal crimping structure to the aluminum electric wire according to claim 1, wherein the crimping barrel for connecting the aluminum electric wire and the crimping barrel for holding the aluminum electric wire are provided. It is characterized in that a slit is formed between them.

  By forming such a slit, it is possible to crimp the aluminum wire conduction crimp barrel and the aluminum wire holding crimp barrel separately. As a result, the crimp barrel for holding aluminum wires retains the aluminum wires at the same compression rate (area reduction) as conventional copper wires, and the aluminum wires are compressed at a large compression rate (area reduction) by the crimp barrel for connecting aluminum wires. By crimping, the insulating oxide film can be destroyed and brought into close contact with each other while securing electrical continuity characteristics.

  Moreover, the terminal crimping structure to the aluminum electric wire according to claim 3 of the present invention is the terminal crimping structure to the aluminum electric wire according to claim 1, wherein the aluminum electric wire conduction crimping barrel and the aluminum electric wire holding crimping barrel are provided. Formed integrally as a wire barrel, when the terminal is crimped, the lower region corresponds to the crimping barrel for aluminum wire conduction when viewed in the terminal crimping direction, and the higher region is the crimp barrel for holding the aluminum wire. It is characterized by corresponding.

  Holds aluminum wires with the same compression ratio (area reduction) as conventional copper wires in the high terminal crimping region corresponding to crimping barrels for holding aluminum wires, and has a low height corresponding to crimping barrels for conducting aluminum wires. In the region, the aluminum electric wire can be crimped with a large compression ratio (area reduction ratio), and the insulating oxide film of the stranded wire can be destroyed and adhered to each other while ensuring electrical continuity characteristics.

  According to a fourth aspect of the present invention, there is provided a terminal crimping structure for an aluminum electric wire, which is provided with a conductor crimping barrel having different front and rear heights (lengths) in addition to an insulation barrel for crimping an aluminum wire covering portion. Is a terminal crimping structure to an aluminum wire, and a barrel for crimping an aluminum wire conductor is formed at a position adjacent to the insulation barrel. The conductor crimping barrel is away from the insulation barrel (front of the terminal). ), The height of the front and rear of the conductor crimping barrel in a state where the barrel for crimping the conductor is crimped to the aluminum wire. Due to the difference, the lower part (rear part) has less bite into the aluminum wire, and the higher part (front part) has more bite into the aluminum wire. It is characterized in that the degree of contact between the wires constituting the aluminum electric wire is different terminals longitudinal direction between the aluminum electric wire (less often rearward portion front portion).

  When crimping with an aluminum wire, the back of the conductor crimping barrel (the part with the short barrel length) has little biting into the aluminum cable and holds the wire firmly, and the front of the conductor crimping barrel (the part with the long barrel length) Can penetrate into the center of the aluminum electric wire and come into contact with many of the strands (stranded wires) constituting the aluminum electric wire to ensure stable conduction.

  Moreover, the manufacturing method of the aluminum electric wire with a terminal of Claim 5 of this invention is a terminal provided with the crimping barrel for aluminum electric wire conduction | electrical_connection and the crimping barrel for aluminum electric wire holding | maintenance in addition to the insulation barrel for aluminum electric wire coating | coated part crimping | compression-bonding. When crimping the aluminum wire to the aluminum wire, the aluminum wire conducting crimp barrel and the aluminum wire retaining crimp barrel are crimped to the aluminum wire with the terminal crimping the aluminum wire conducting crimp barrel more than the aluminum wire retaining crimp barrel. A feature of the present invention is that an aluminum electric wire with the terminal crimped is manufactured by crimping the aluminum electric wire at a low height when viewed in the direction.

  Moreover, the manufacturing method of the aluminum electric wire with a terminal of Claim 6 of this invention is a terminal provided with the barrel for aluminum electric wire conductor crimping in which the length of a barrel differs in front and back in addition to the insulation barrel for aluminum electric wire coating | coated part crimping When crimping aluminum wire to the aluminum wire, the aluminum wire conductor crimping barrel is crimped to the aluminum wire. There is little biting into the electric wire, and the high part (front part) is biting into the aluminum electric wire, and the degree of contact with each wire constituting the aluminum electric wire differs in the terminal longitudinal direction (front and rear direction of the conductor crimping barrel) It is characterized by producing crimped aluminum wires.

  When the aluminum wire crimping method according to claims 5 and 6 of the present invention is carried out, the terminal crimping strength (terminal and wire holding force) required for each wire size of the aluminum wire is secured, and the aluminum wire is secured. It is possible to obtain an aluminum electric wire in which a terminal that secures electrical conductivity is crimped by destroying and closely adhering the insulating oxide film.

  By crimping the aluminum wire conduction crimp barrel and the aluminum wire holding crimp barrel to the aluminum wire conductor, the terminal and the aluminum wire can be stably connected to each other and the terminal holds the aluminum wire firmly for a long time.

  Further, by forming a slit in the wire barrel to form a bifurcated barrel, a stepped crimp structure is facilitated, and a stable conductive connection and long-term terminal retention are possible.

  Furthermore, by crimping the crimping part of the aluminum wire conductor part of the wire barrel with a two-step difference, stable connection between the terminal and the aluminum cable and long-term holding of the terminal to the aluminum cable are possible. To do.

  Furthermore, if an aluminum alloy terminal is used for the terminal itself, the occurrence of electrolytic corrosion between different kinds of metals can be prevented.

  Drawing 1 is a top view (Drawing 1 (a)) and side view (Drawing 1 (b)) of aluminum electric wire crimp terminal 10 concerning one embodiment of the present invention. As is apparent from the figure, the aluminum wire crimping terminal 10 is composed of an inter-terminal connection portion 10a formed on one side in the longitudinal direction of the terminal and an electric wire connection portion 10b formed on the other side in the longitudinal direction. The portion 10 b includes an insulation barrel 15 that is crimped to a wire covering portion of an aluminum electric wire, and a conduction barrel 12 and a holding barrel 13 that are formed between the interterminal connection portion 10 a and the insulation barrel 15. The conduction barrel 12 is formed on the terminal connecting portion side, that is, on the tip end side of the aluminum wire 1 to be crimped (see FIG. 3), and the holding barrel 13 is on the insulation barrel side, that is, on the wire covering portion side of the aluminum wire 1. It is formed in the vicinity. In the case of this embodiment, the conduction barrel 12 and the holding barrel 13 are adjacent to each other, and a narrow slit 19 is formed between them.

  Then, the process of crimping | bonding the aluminum electric wire crimp terminal 10 concerning this embodiment to the aluminum electric wire 1 is demonstrated. As shown in FIG. 2A, first, the aluminum wire crimp terminal 10 is fixed to the base 210, and the aluminum wire 1 is positioned at an appropriate position of the aluminum wire crimp terminal 10. That is, the covering portion 1b (see FIG. 3A) of the aluminum electric wire 1 is positioned in a region sandwiched between the insulation barrels 15, and the conductor portion 1a (see FIG. 3A) of the aluminum electric wire 1 is connected to the conduction barrel 12. And the holding barrel 13 are positioned in the respective regions. In this state, a crimping jig 110 having a crimp groove having an inverted V shape and an M-shaped tip as viewed in the longitudinal direction of the terminal is approached from above the terminal (an arrow X2 indicating a terminal crimping direction in FIG. 2A). reference). As is apparent from FIG. 2, the crimping jig 110 is formed with three conducting barrels 12 to be crimped, a holding 13, and crimping portions 112, 113, and 115 corresponding to the insulation barrel 15. That is, the crimping portion 112 corresponding to the conduction barrel 12 is formed so as to protrude most in the terminal crimping direction, then the crimping portion 113 corresponding to the holding barrel 13 is formed, and the crimping portion 115 corresponding to the insulation barrel 15 is most retracted. Is formed. Then, the crimping jig 110 is lowered toward the terminal side by an actuator (not shown) (see arrow X2 in FIG. 2A). By this descending operation, the end portions of the barrels 12, 13, 15 are gradually bent along the inverted V-shaped crimp groove of the crimping jig 110, and eventually, at the M-shaped tip portion of the crimping jig 110. As shown in FIG. 2C, each barrel end is deformed (curled) in the direction of the central axis of the aluminum electric wire 1. Then, by further lowering the crimping jig 110, the conduction barrel 12 and the holding barrel 13 are crimped to the aluminum wire conductor portion 1a, and the insulation barrel 15 is also crimped to the covering portion 1b of the aluminum wire 1. When this terminal crimping operation is completed, as shown in FIG. 2D, the crimping jig is raised (see arrow Y2 in the figure) to complete the terminal crimping process.

  A terminal crimping structure of the aluminum wire 1 crimped in this way is shown in FIG. By using the special crimping jig 110 shown in FIG. 2, the crimping portion of the conduction barrel 12 is crimped to the aluminum electric wire 1 at a compression rate (area reduction rate) larger than that of the crimping portion of the holding barrel 13. The crimping height of the conducting barrel 12 is crimped to be lower than the crimping height of the holding barrel 13 when viewed in the terminal crimping direction.

  That is, the holding barrel 13 is not pressure-bonded at a compression rate (area reduction rate) as large as that of the conduction barrel 12. As a result, the conductor portion 1 a led out from the covering portion 1 b of the aluminum electric wire 1 is pressed by the conductive barrel 12 with a large compression rate (area reduction rate) and is held by the holding barrel 13. Accordingly, the terminal 10 holds the aluminum electric wire 1 at a pressure level of the holding barrel 13 to an extent that the mechanical strength is not excessive, and the surface oxide film of the aluminum electric wire 1 is applied to the pressure-bonding portion of the conductive barrel 12 adjacent thereto. The terminals are crimped at a sufficiently high compression rate (area reduction rate) to break and adhere. Such step-by-step crimping causes a decrease in terminal holding force due to excessive terminal compression rate (area reduction) to aluminum wires and poor conduction due to insufficient terminal compression rate (area reduction rate). Can be solved.

  Next, various modifications relating to the aluminum wire crimp terminal shown in FIG. 3 will be described with reference to FIGS. 4 to 11. In addition, about the structure same as the aluminum electric wire crimp terminal 10 shown in FIG. 3, corresponding code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The aluminum wire crimping terminal 20 shown in FIG. 4 has the same basic configuration as the aluminum wire crimping terminal 10 shown in FIG. 3, but the slit 29 between the conduction barrel 22 and the holding barrel 23 has the aluminum wire crimping contact shown in FIG. 3. It is formed wider than the slit 19 of the terminal 10 (see FIG. 4B). As a result, as shown in FIG. 5, the aluminum wire crimp terminal 20 is crimped when the conduction barrel 22, the holding barrel 23, and the insulation barrel 25 are crimped by using a special stepped crimping jig 120. Even if there is a slight misalignment between the conduction barrel 22 and the holding barrel 23 and the crimping jig 120, the conduction barrel 22 can be crimped with a large compression ratio (area reduction) and the holding barrel 23 is compared with the conduction barrel 22. Can be crimped with a small compression ratio (area reduction).

  FIG. 6 shows a terminal crimping state to the aluminum electric wire 1 using such a crimping jig 120. As apparent from FIG. 6B, when the crimping portion of the conduction barrel 22 and the crimping portion of the holding barrel 23 are compared, the crimping portion of the conduction barrel 22 is more than the crimping portion of the holding barrel 23 when viewed in the terminal crimping direction. It is crimped low (see FIG. 6B for comparison between height Hm and height Hn). That is, the aluminum wire conductor portion 1 a led out from the covering portion 1 b of the aluminum wire 1 is held with a sufficient holding force that is not unreasonable in mechanical strength at the crimping portion of the holding barrel 23. At the same time, in the crimping portion of the conductive barrel 22 formed adjacent to the end portion of the aluminum wire from the holding barrel 23, the surface oxide film of the conductor portion 1a of the aluminum wire 1 is sufficiently large to break and adhere closely. The pressure is reduced by the compression ratio (area reduction ratio), and as a result, sufficient electrical conduction characteristics are achieved in this portion.

  Next, the aluminum wire crimp terminal 30 shown in FIG. 7 will be described. The aluminum wire crimp terminal 30 shown in FIG. 7 is formed as a conductive barrel 31 in which a conduction barrel 32 and a holding barrel 33 are integrated, unlike the two types of aluminum wire crimp terminals 10 and 20 described above. That is, no slit is formed between the conduction barrel 32 and the holding barrel 33. Even when such a crimp terminal is used, the conduction barrel 32 and the holding barrel 33 are obtained by crimping the aluminum wire crimp terminal 30 to the aluminum wire 1 using the above-described special stepped crimp jig 120 (see FIG. 5). Can be crimped in a stepped state corresponding to the level difference of the crimping jig 120. As a result, as shown in FIG. 8, when viewed in the terminal crimping direction, the terminal crimping region corresponding to the conduction barrel 32 is crimped lower than the terminal crimping region corresponding to the holding barrel 33 (in FIG. 8). Compare height Hc and height Hd). As a result, the same effect as described above, that is, in the terminal crimping region corresponding to the holding barrel 33, the conductor portion 1a is extended over a long period of time without excessive mechanical strength to the aluminum wire conductor portion 1a derived from the covering portion 1b. Hold firmly. At the same time, in the terminal crimping region corresponding to the conductive barrel 32 formed on the end side of the aluminum wire adjacent to the holding barrel 33, the oxide film of the aluminum wire conductor portion 1a is sufficiently large to be broken and adhered. With this compression ratio (area reduction ratio), sufficient electrical conduction characteristics can be obtained at this portion.

  Instead of using the stepped crimping jig 120 for the aluminum wire crimping terminal 30 shown in FIG. 7 described above, the tip is M-shaped (grooved) with an inverted V-shaped groove as viewed in the longitudinal direction of the terminal to be crimped. A crimping jig (not shown) in which the bottom M-shaped groove depth continuously changes may be used. That is, in realizing the terminal crimping state of the aluminum wire as shown in FIG. 9, for example, as the groove depth of the reverse V-shaped crimping groove of the crimping jig moves toward the insulation coating side of the aluminum wire to be crimped. A jig (not shown here) formed so as to be continuously deep (so that the depth of the reverse V-shaped crimp groove of the crimping jig is continuously reduced toward the tip of the aluminum wire) ) May be used. By crimping the terminal using such a crimping jig, even if the conduction barrel 42 and the holding barrel 43 are integrally formed as a wire barrel, after crimping, as shown in FIG. In addition, the conductive barrel 42 can be crimped so as to be continuously lower in the terminal crimping direction than the holding barrel 43 as it goes toward the tip of the aluminum wire.

  FIG. 9B shows a cross-section of the crimped state of the aluminum wire crimp terminal 40 thus crimped. As is apparent from the figure, the crimping region corresponding to the conduction barrel 42 is crimped with a considerably strong force (refer to the AA-AA cross-sectional view of FIG. 9B), and thereby an aluminum wire (not shown here) Sufficient electrical conduction can be achieved. On the other hand, the crimping region corresponding to the holding barrel 43 is not crimped with a compression rate (area reduction) as large as that of the conductive barrel 42 (see the BB-BB cross-sectional view of FIG. 9B). As a result, it is possible to hold the aluminum wire firmly for a long period of time in the holding barrel 43, which is a conductor lead-out portion from the aluminum wire covering portion, without excessive mechanical strength on the conductor portion of the aluminum wire. Moreover, the area | region corresponding to the conduction | electrical_connection barrel 42 is crimped | bonded by a bigger compression rate (area reduction ratio) as it goes to the edge part side of an aluminum electric wire, and the oxide film of an aluminum electric wire is destroyed and sufficient electric conduction is enabled. .

  Instead of devising such a crimping groove shape on the crimping jig side, that is, instead of providing a crimping jig with a special stepped portion or a groove portion whose depth changes in the terminal longitudinal direction, FIG. As shown, it is possible to exert the same effect by devising the wire barrel shape of the aluminum electric wire crimp terminal 50.

  In the aluminum wire crimping terminal 50 shown in FIG. 10, the conducting barrel 52 and the holding barrel 53 are integrated as the conducting barrel 51, but the portion corresponding to the conducting barrel 52 is higher than the portion corresponding to the holding barrel 53. It is formed in an upright state (see angle α in FIGS. 10B and 10C). That is, the height of the wire barrel 51 is gradually increased toward the tip of the aluminum wire to be crimped.

  When the conventional crimping jig 180 shown in FIG. 13 is used for crimping, the crimping portion corresponding to the conduction barrel 52 and the holding barrel 53 are viewed in the terminal crimping direction as shown in FIG. The height of the crimping part is the same (see the comparison of height He and height Hf in FIG. 11A). However, since the region of the conduction barrel 52 is originally formed to have a longer length in the terminal crimping direction than the region of the holding barrel 53, as can be seen from the sectional comparison view of the terminal crimped state shown in FIG. The terminal tip in the region of the conduction barrel 52 is deeper than the terminal tip in the region of the holding barrel 53 into the stranded wire (not shown) of the aluminum electric wire. Thus, the aluminum electric wire can be firmly held for a long time without applying excessive stress to the aluminum electric wire (not shown) in the region corresponding to the holding barrel 53. At the same time, in the region corresponding to the conduction barrel 52, a large amount of contact is made with each stranded wire (elementary wire) of the aluminum electric wire, and at the same time, the surface oxide is destroyed and crimped with an intimate terminal compression ratio, and sufficient electrical conduction characteristics are obtained. Can be secured.

  As described above, by devising the shape of the crimping jig or by devising the wire barrel shape of the aluminum wire crimping terminal, the compression rate (area reduction) of the aluminum wire is crimped from the crimping part of the holding barrel to the conduction barrel. Intensify stepwise or continuously to the part to ensure sufficient electrical continuity while maintaining a long hold of the terminal. Moreover, it becomes possible to manufacture a wire harness having sufficient mechanical strength and electrical conduction characteristics by crimping such a terminal to a wire harness provided with an aluminum electric wire in the above-described process. When such a wire harness is routed in a vehicle, the wire harness has sufficient strength to withstand the routing operation, so that the efficiency of the wire harness routing operation can be improved. At the same time, it is possible to realize the wiring work of the wire harness having excellent conduction characteristics and reliability over a long period of time.

  In addition, although the terminal connection part of the crimp terminal shown in this embodiment has a female shape of a conventional crimp terminal (that is, a tongue spring structure), the present invention is not necessarily limited thereto, and this part may be a male shape. Applicable, and various terminal structures can be used for the terminal connection part.

  In addition, as a terminal material to be applied, it is preferable to avoid a dissimilar metal and use an aluminum alloy-based terminal from the viewpoint of preventing electrolytic corrosion, but it is not necessarily limited to this material.

  In addition, in order to prevent oxidation due to air and corrosion due to moisture at the terminal connection portion, it is possible to obtain higher reliability by applying a rust preventive grease to the terminal connection portion and the terminal crimping portion. .

  Although the present invention can be applied to a crimping terminal for a connector that can be inserted / removed for connecting an aluminum electric wire that uses aluminum as a conductor, this application is limited to the wiring harness wiring in an automobile as a main application. In addition, the present invention can be used in various fields in which a terminal is crimped to the end of such an aluminum electric wire.

It is a top view ((Drawing 1 (a)) and a side view (Drawing 1 (b)) of an aluminum electric wire crimp terminal concerning one embodiment of the present invention. A first side view (left side) and a second side view showing a state in which the aluminum wire crimping terminal shown in FIG. 1 is crimped to the aluminum wire via a crimping jig in the order of steps of FIGS. 2 (a) to 2 (d). It is a side view (right side) of 2. It is the top view (Drawing 3 (a)) and the side view (Drawing 3 (b)) which showed the state where the aluminum electric wire crimping terminal shown in Drawing 1 was crimped to the aluminum electric wire. It is the top view (FIG.4 (a)) and side view (FIG.4 (b)) which showed the modification of the aluminum electric wire crimp terminal shown in FIG. It is process explanatory drawing which showed the crimping process of the aluminum electric wire crimp terminal shown in FIG. 4 corresponding to FIG. They are the top view (Drawing 6 (a)) and the side view (Drawing 6 (b)) which showed the state where the aluminum electric wire crimping terminal shown in Drawing 4 was crimped to the aluminum electric wire. It is the top view (FIG.7 (a)) and side view (FIG.7 (b)) which showed the further modification of the aluminum electric wire crimp terminal shown in FIG. It is the top view (Drawing 8 (a)) and the side view (Drawing 8 (b)) which show the state where the aluminum electric wire crimping terminal shown in Drawing 7 was crimped to the aluminum electric wire. The side view (FIG. 9 (a)) which shows the state which crimped the aluminum electric wire crimping terminal different from the aluminum electric wire crimping terminal shown in FIG. 7 to the aluminum electric wire except for the aluminum electric wire, and AA- in FIG. 9 (a) It is AA sectional drawing and BB-BB sectional drawing (FIG.9 (b)). It is the top view (FIG. 10 (a) and side surface (FIG.10 (b))) which showed the modification of the aluminum electric wire crimp terminal of FIG. 9, and the expanded state figure (FIG.10 (c)) of the said crimp terminal. The side view (FIG. 11 (a)) which shows the state which crimped the aluminum electric wire using the aluminum electric wire crimp terminal shown in FIG. 10, CC-CC sectional drawing which showed the predetermined cross section, and DD-DD sectional drawing (FIG. 11) (B)). It is sectional drawing (FIG. 12 (a)) and the side view (FIG.12 (b)) which showed the conventional copper electric wire crimp terminal. It is process explanatory drawing corresponding to FIG. 2 which showed the process of crimping | bonding the copper electric wire crimp terminal shown in FIG. 12 to the aluminum electric wire. The top view (FIG. 14 (a)) which showed the state which crimped | bonded the aluminum electric wire crimp terminal shown in FIG. 12 to the aluminum electric wire, and the side view which showed the crimping state at the time of crimping | bonding with a small compression rate (area reduction rate) ( FIG. 14 (b)) and a side view (FIG. 14 (c)) showing a crimped state when crimped with a large compression rate (area reduction rate).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Conductor part 1b Covering part 10, 20, 30, 40, 50 Aluminum electric wire crimp terminal 10a, 80a Terminal connection part 10b, 80b Electric wire connection part 12, 22, 32, 42, 52 Conduction barrel 13, 23, 33, 43 , 53 Holding barrel 15, 85 Insulation barrel 19, 29 Slit 25 Insulation barrel 51, 81 Wire barrel 80 Terminal 110, 120, 180 Crimping jig 181, 185 Crimping part 210 Base

Claims (6)

In addition to the insulation barrel for crimping the aluminum wire covering portion, in addition to the crimping barrel for conducting the aluminum wire and the crimping barrel for holding the aluminum wire, the terminal crimping structure to the aluminum wire for crimping the aluminum wire to the aluminum wire,
The aluminum wire holding crimp barrel is formed at a position adjacent to the insulation barrel, and the aluminum wire conducting crimp barrel is formed on the opposite side of the insulation barrel with respect to the aluminum wire holding crimp barrel. When the crimp barrel is crimped to the aluminum wire, the aluminum wire conduction crimp barrel is crimped to the aluminum wire at a lower height than the aluminum wire holding crimp barrel when viewed in the terminal crimp direction. Terminal crimping structure to aluminum wires.   The terminal crimping structure to an aluminum electric wire according to claim 1, wherein a slit is formed between the aluminum electric wire conduction crimping barrel and the aluminum electric wire holding crimping barrel.   The aluminum wire conducting crimping barrel and the aluminum wire holding crimping barrel are integrally formed as a wire barrel, and when the terminal is crimped, the lower region of the wire barrel as viewed in the terminal crimping direction is the aluminum The terminal crimping structure to an aluminum electric wire according to claim 1, wherein a region having a high height corresponding to the crimping barrel for electric wire conduction corresponds to the crimping barrel for holding an aluminum electric wire. In addition to the insulation barrel for crimping the aluminum wire covering portion, in addition to the insulation crimp barrel having different front and rear heights, it is a terminal crimping structure to the aluminum wire that crimps the terminal to the aluminum wire,
The aluminum wire conductor crimping barrel is formed at a position adjacent to the insulation barrel, and the conductor crimping barrel has an oblique structure in which the barrel height increases toward the direction away from the insulation barrel, and the conductor In the state where the crimping barrel is crimped to the aluminum electric wire, the front and rear heights of the conductor crimping barrel are different, so that the lower portion has less biting into the aluminum electric wire and the higher portion is the aluminum electric wire. A terminal crimping structure to an aluminum electric wire, characterized in that the bite into the aluminum electric wire is large and the degree of contact with each wire constituting the aluminum electric wire differs in the terminal longitudinal direction with respect to the aluminum electric wire. In crimping a terminal equipped with an aluminum wire conduction crimp barrel and an aluminum wire holding crimp barrel to an aluminum wire in addition to an insulation barrel for crimping an aluminum wire cover,
The aluminum wire conducting crimp barrel and the aluminum wire retaining crimp barrel are crimped to the aluminum wire, and the aluminum wire conducting crimp barrel is lower than the aluminum wire retaining crimp barrel in the terminal crimping direction. A method for producing an aluminum electric wire with a terminal, characterized in that an aluminum electric wire obtained by crimping the terminal is produced by crimping the electric wire. In crimping a terminal equipped with a barrel for conductor crimping with different front and rear heights in addition to an insulation barrel for crimping an aluminum wire coating,
The aluminum wire conductor crimping barrel is formed at a position adjacent to the insulation barrel, and the conductor crimping barrel has an oblique structure in which the barrel height increases toward the terminal direction away from the insulation barrel. When the terminal is crimped to the aluminum electric wire using a terminal, the height of the conductor crimping barrel is low because the conductor crimping barrel is crimped to the aluminum electric wire. The part has little bite into the aluminum wire, the high part has big bite into the aluminum wire, and the terminal is made of the aluminum wire so that the contact degree with each wire constituting the aluminum wire differs in the terminal longitudinal direction with the aluminum wire. A method for producing an aluminum electric wire with a terminal, characterized in that an aluminum electric wire obtained by crimping the terminal is produced by crimping the electric wire.

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