JP2010198776A - Crimp terminal for aluminum wire, and crimping structure to aluminum wire using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crimp terminal for an aluminum wire, the crimp terminal reducing the occurrence of cracks in a boundary region with a crimping part for retaining the aluminum wire and a crimping part for conducing the aluminum wire, and to provide a crimping structure to the aluminum wire using this crimp terminal. <P>SOLUTION: The crimp terminal for the aluminum wire includes a base 200 on which an aluminum wire conductor portion is placed, and a barrel 1a for conductive-crimping the aluminum wire, which is formed continuously with the base 200 and having a side portion 201 for rolling in the aluminum wire conductor portion to crimp it. The crimp terminal further has a serration region where serrations 2a, 2b are formed on a plane brought into contact with the aluminum wire conductor portion on the barrel 1a for conductively crimping the aluminum wire. When the barrel 1a for conductively crimping the aluminum wire is crimped to the aluminum wire conductor portion, a flat region where no serration is formed is provided on at least the side portion 201 in the boundary region with a portion used as a crimping part for conducting the aluminum wire and a portion used as a crimping part for retaining the aluminum wire. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a crimp terminal for an aluminum electric wire used for, for example, a wire harness of a vehicle and a crimp structure to an aluminum electric wire using the same.

  In recent years, for example, wire harnesses made of aluminum wires instead of copper wires have been used in vehicles. First, the aluminum wire is lighter than the copper wire, so that the vehicle can be lightened. Secondly, it was difficult to separate the copper and iron from the conventional copper wire that remained in the body when the vehicle was recycled. By using an aluminum wire, the aluminum and iron were recycled when the aluminum was left in the vehicle. It is easy to separate from the above so that it is excellent in recyclability. Third, aluminum wires are cheaper than copper wires.

  However, an aluminum electric wire has characteristics that mechanical strength and fusing temperature are lower than that of a conventional 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.

  However, by destroying the oxide film of each stranded wire and tightly crimping the terminal to the aluminum wire so that the wire barrel and the wire barrel are in close contact, the electrical continuity characteristics can withstand environmental tests such as a thermal cycle. However, due to excessive stress acting on the terminal crimping portion, the electric wire holding force is extremely reduced, and the connection structure between the terminal and the electric wire may be inappropriate.

  A terminal crimping structure to an aluminum electric wire that solves this problem is disclosed in Patent Document 1, for example. As shown in FIGS. 13 and 14, this terminal crimping structure to an aluminum wire includes an aluminum wire conductive crimping barrel 5a and an insulation barrel 5b for crimping an aluminum wire covering portion, and the insulation barrel 5b after terminal crimping. An aluminum wire holding and crimping portion 52 is formed adjacent to the insulation coating and crimping portion 55 to which the aluminum wire is crimped, and an aluminum wire conducting and crimping portion 51 is provided on the opposite side of the aluminum wire holding and crimping portion 52 from the aluminum wire insulation coating and crimping portion 55. Is formed. And in the state which the terminal was crimped | bonded to the aluminum electric wire W, it has the structure crimped | bonded in the state where the height of the aluminum electric wire conduction | electrical_connection crimping | compression-bonding part 51 in a crimping direction is lower than the height of the aluminum electric wire holding | maintenance crimping | compression-bonding part 52.

  By having such a configuration, the conductor portion Wa of the aluminum electric wire W is firmly held in the aluminum wire holding crimping portion 52 behind the terminal, and a large compression ratio (area reduction rate) in the aluminum wire conducting crimping portion 51 in front of the terminal. ), The insulating oxide film of the conductor portion Wa of the aluminum electric wire W is broken and brought into close contact, so that sufficient electrical characteristics can be obtained between the terminal 5 and the aluminum electric wire W.

  Here, in order to increase the pull-out strength of the aluminum wire when the crimped and connected aluminum wire W receives a tensile force from the length direction, the inner surface of the aluminum wire conductive crimping barrel has a plurality of strips on the entire surface. A serration made of a groove is formed (for example, Patent Document 2).

Japanese Patent Laying-Open No. 2005-50736 (paragraphs (0035) to (0038), FIGS. 7 and 8) JP 2003-249284 (paragraphs (0003), (0021) to (0022), FIG. 1, FIG. 2, FIG. 4, FIG. 5, FIG. 7)

  However, as in the crimp terminal structure described in Patent Document 1, when the aluminum wire holding and crimping portion having different heights in the crimping direction are formed adjacent to each other, a step is formed in this boundary region. Excessive internal stress is generated in this step during terminal crimping. In addition, when serrations as disclosed in Patent Document 2 are formed on the entire inner surface of the aluminum wire conductive crimping barrel, the thickness (plate thickness) of the groove portion of the serrations is reduced, resulting in steps. In combination with the internal stress, the aluminum wire crimp terminal may crack in the boundary region between the aluminum wire holding and crimping portion and the aluminum wire conducting crimp portion, thus reducing the product yield.

  An object of the present invention is to provide a crimp terminal for an aluminum wire that can reduce the occurrence of cracks in the boundary region between the aluminum wire holding and crimping portion and the aluminum wire conducting crimp portion, and a crimp structure to an aluminum wire using the same. There is.

  In order to achieve the above-described object, the crimp terminal for an aluminum wire according to the present invention includes a base portion on which an aluminum wire conductor portion from which the coating of the aluminum wire is removed when crimping the aluminum wire, and a continuous base portion. An aluminum wire conductive crimping barrel having a side portion for winding and crimping the aluminum wire conductor portion formed on the surface of the aluminum wire conductive crimping barrel in contact with the aluminum wire conductor portion. An aluminum wire conductive crimping portion for breaking and crimping the oxide film of the aluminum wire conductor portion when the aluminum wire conductive crimping barrel is crimped to the aluminum wire conductor portion; At least in the side part of the boundary region between the portion to be the portion and the portion to be the aluminum wire holding and crimping portion for holding the aluminum wire conductor portion. And having a flat area where emissions are not formed.

  Furthermore, you may make it have a 2nd flat area | region where the said serration is not formed in the said base part at least in the said aluminum electric wire conduction crimping | compression-bonding part side rather than the said boundary area | region of the said barrel for aluminum electric wire crimping | compression-bonding.

  Further, the serration includes a convex portion and a concave portion, and at least the base portion on the side of the aluminum electric wire conductive crimping portion with respect to the boundary region of the aluminum electric wire conductive crimping barrel is a concave portion constituting another portion of the serration. The serration having a recess having a larger thickness may be formed.

  Moreover, the terminal crimping structure to the aluminum electric wire according to the present invention is a terminal crimping structure to the aluminum electric wire using the above-described aluminum electric wire crimping terminal, and after the aluminum electric wire is crimped, the height of the aluminum electric wire conducting crimping portion in the crimping direction is high. Is lower than the height of the aluminum wire holding and crimping portion, and the boundary region between the aluminum wire conducting and crimping portion and the aluminum wire holding and crimping portion has a tapered surface.

  According to the crimp terminal for aluminum wires of the present invention, it is possible to reduce the occurrence of cracks in the boundary region between the aluminum wire holding and crimping portion of the aluminum wire crimp terminal.

It is a side view of the crimp terminal for aluminum electric wires concerning one embodiment of the present invention. It is a top view of the crimp terminal for aluminum electric wires shown in FIG. It is the partial expanded view which expand | deployed the part for the barrel for aluminum electric wire conductive crimps of FIG. 2, and the insulation barrel. It is sectional drawing which showed typically the shape of the serration of the crimp terminal for aluminum electric wires which concerns on one Embodiment of this invention. It is a side view which shows the crimping | compression-bonding structure to the aluminum electric wire of the crimp terminal for aluminum electric wires which concerns on one Embodiment of this invention. It is a top view of the crimping | compression-bonding structure shown in FIG. It is explanatory drawing explaining the crimping | compression-bonding structure shown in FIG. It is a graph which shows the result of the evaluation experiment about the relationship between the level | step difference amount of an aluminum wire holding | maintenance crimping | compression-bonding part and an aluminum wire conduction crimping part, and the cross-sectional area of the conductor part of an aluminum wire. It is explanatory drawing explaining the crimping process to the aluminum electric wire of the crimp terminal for aluminum electric wires. It is an expanded view which shows the variation of the serration of the crimp terminal for aluminum electric wires by this invention. It is an expanded view which shows the other form of the crimp terminal for aluminum electric wires by this invention. It is an expanded view which shows the other form of the crimp terminal for aluminum electric wires by this invention. It is a side view which shows the crimping | compression-bonding structure to the aluminum electric wire of the crimp terminal for aluminum electric wires. It is a top view of the crimping | compression-bonding structure shown in FIG.

  Hereinafter, a crimping terminal 1 for an aluminum electric wire according to an embodiment of the present invention and a terminal crimping structure to an aluminum electric wire W using the crimping terminal 1 for an aluminum electric wire will be described based on the drawings.

  1 is a side view of a crimp terminal 1 for an aluminum wire according to an embodiment of the present invention, FIG. 2 is a plan view of the crimp terminal 1 for an aluminum cable shown in FIG. 1, and FIG. 3 is an aluminum cable of FIG. It is the partial expanded view which expand | deployed the part of the barrel 1a for electroconductive crimping, and the insulation barrel 1b. As shown in FIG. 1 to FIG. 3, the crimp terminal 1 for an aluminum electric wire is composed of an inter-terminal connection portion 110 formed on one side in the longitudinal direction and an electric wire connection portion 111 formed on the other side in the longitudinal direction. The connection portion 111 is formed between an insulation barrel 1b that is crimped to an aluminum wire covering portion Wb (see FIG. 5 and the like) of the aluminum wire W, and between the inter-terminal connection portion 110 and the insulation barrel 1b. An aluminum wire conductive crimping barrel 1a that is crimped to the removed aluminum wire conductor Wa (see FIG. 5 and the like) is provided. The insulation barrel 1b and the aluminum wire conductive crimping barrel 1a include a base portion 200 on which the aluminum wire conductor portion Wa is placed when the aluminum wire W is crimped, and the base wire 200 continuously formed on both sides thereof. A rectangular thin plate having a side portion 201 for winding and crimping the conductor portion Wa is formed to be bent into a U-shaped cross section.

  Here, the aluminum electric wire W in this embodiment is not only an electric wire made of almost 100% aluminum but also an aluminum alloy in which aluminum containing about 0.5% of a few elements each occupies 98 to 99%. The electric wire which becomes. Moreover, although the crimp terminal 1 for aluminum electric wires in this embodiment consists of brass, it is not limited to this, For example, you may comprise with copper alloys other than brass.

  The aluminum wire conductive crimping barrel 1a is used to crimp the aluminum wire W using a stepped terminal crimping crimper (crimping jig) 101 (see FIG. 9), thereby destroying the oxide film of the aluminum wire conductor portion Wa. In addition, the aluminum wire conductive crimping portion 11 and the aluminum wire conductor portion Wa for obtaining sufficient electrical conduction characteristics are crimped with a compression ratio (area reduction ratio) large enough to be in close contact, and mechanical strength is not possible. The aluminum wire holding and crimping portion 12 that holds the aluminum wire conductor portion Wa firmly for a long time, and the tapered crimping portion 13 between the aluminum wire conducting and crimping portion 11 and the aluminum wire holding and crimping portion 12 are formed. (Refer to FIG. 5, FIG. 6, etc.).

  In contact with the inner surface, that is, the aluminum wire W, on the side of the aluminum wire holding and crimping part 12 rather than the boundary region between the part that becomes the aluminum wire conducting and crimping part 11 and the portion that becomes the aluminum wire holding and crimping part 12 of the barrel for aluminum wire conductive crimping As shown in FIG. 3, a serration region having serrations 2 b for increasing the pull-out strength of the aluminum wire W when the crimped and connected aluminum wire W receives a tensile force from the length direction is provided on the surface to be bonded. Yes. The serration 2b is provided with a concave portion (strip groove 21b) and a convex portion by providing two strip grooves 21b having a U-shaped cross section as shown in FIG. A portion 22b (a portion other than the groove 21b) is formed. In addition, the serration region having serrations 2a composed of concave portions (strip grooves 21a) and convex portions 22a (parts other than the strip grooves 21a) is also provided on both side portions 201, 201 closer to the aluminum wire conductive crimping portion 11 than the boundary region. Is provided.

  On the contrary, a flat region in which no serration is formed over the base portion 200 and both side portions 201 and 201 is provided in the boundary region between the portion that becomes the aluminum wire conductive crimp portion 11 and the portion that becomes the aluminum wire holding crimp portion 12. Yes. Moreover, the 2nd flat area | region in which the serration is not formed is provided also in the base part 200 of the aluminum electric wire conduction | electrical_connection crimping | compression-bonding part side rather than the boundary area | region of the barrel for aluminum electric wire conductive crimping | compression-bonding. Here, the boundary region is between the aluminum wire conductive crimping portion 11 and the aluminum wire holding crimping portion 12, and when the both side portions 201, 201 are crimped to the aluminum wire W, the aluminum wire conductive crimping portion 11. And the aluminum wire holding crimping part 12 are areas where the thin brass plate is stretched to the extent that cracks occur when serrations are provided due to the difference in the compression rate between the aluminum wire holding crimping part 12 and the tapered crimping part formed after crimping. 13 is an area including 13. Further, the base portion 200 of the aluminum wire conductive crimping portion 11 has a high crimping rate when the aluminum wire conductive crimping portion 11 is crimped to the aluminum electric wire W, so that it is thin enough to cause a crack when the serration 2b is provided. It is a portion where brass is extended, and in the present embodiment, it is a bottom surface portion when a U-shaped open surface in the cross-sectional shape is the top surface.

  The number of the grooves 21a and 21b constituting the serrations 2a and 2b is not limited, and the shape may be a groove 23 having a V-shaped cross section as shown in FIG. 4B. Furthermore, instead of the grooves 21a and 21b, by providing a convex strip 24 having a U-shaped cross section as shown in FIG. 4 (C) and a convex strip 25 having a cross-sectional mountain shape as shown in FIG. 4 (D), You may form a convex part (convex ridges 24 and 25) and recessed part 26 and 27 (parts other than the ridges 24 and 25).

  Next, the crimping | compression-bonding structure to the aluminum electric wire W of the crimp terminal 1 for aluminum electric wires by this embodiment is demonstrated. 5 is a side view showing the crimping structure of the aluminum wire crimping terminal 1 to the aluminum wire W, FIG. 6 is a plan view of the crimping structure shown in FIG. 5, and FIG. 7 is the crimping structure shown in FIG. It is explanatory drawing demonstrated.

  As shown in FIGS. 5 to 7, in this crimping structure, the height of the aluminum wire conductive crimping portion 11 in the crimping direction (the X direction in FIG. 9A) is lower than the height of the aluminum wire holding crimping portion 12. A tapered crimping portion 13 having a tapered surface inclined in the height direction is formed between the aluminum wire conductive crimping portion 11 and the aluminum wire holding crimping portion 12.

  Here, when the angle θ (see FIG. 7) formed by the taper surface and the longitudinal axis of the aluminum wire crimping terminal 1 is 70 ° or less, the tapered crimping portion 13 is not crimped to the aluminum wire W. Excessive stress is not generated in the portion between the aluminum wire conductive crimping portion 11 and the aluminum wire holding crimping portion 12, and cracks can be prevented from being generated. However, if θ is smaller than 20 °, the total length of the aluminum wire crimping terminal 1 is predetermined in relation to the connector to be fitted, so the lengths of the aluminum wire conductive crimping portion 11 and the aluminum wire holding crimping portion 12 are long. It becomes short and is not preferable. Accordingly, θ is preferably 20 ° ≦ θ ≦ 70 °.

  In addition, from the viewpoint of mechanical connectivity and electrical connectivity, the ratio (compression ratio) of the cross-sectional area of the aluminum wire conductor portion Wa before and after crimping to the aluminum wire W is 82 to 97% in the aluminum wire holding and crimping portion 12. And it is preferable that it is 50 to 75% in the aluminum electric wire conduction crimping part 11. The compression rate is a numerical value defined by (a cross-sectional area of the aluminum electric wire conductor Wa after terminal crimping / a cross-sectional area of the aluminum electric wire conductor Wa before terminal crimping).

Further, the step of bonding direction between the aluminum electric wire holding crimping portion 12 and the aluminum electric wire conducting crimp portion 11 and y mm (ht-he in Fig. 5), the cross-sectional area of the conductor of the aluminum electric wire W before crimping and xmm ² In this case, it is preferable that the relationship of 0.15 ln x + 0.1 ≦ y ≦ 0.2 ln x + 0.3 is satisfied. Here, an evaluation test related to the relationship between the step amount y and the cross-sectional area x will be described. In this evaluation test, in the crimping structure of the aluminum wire crimping terminal 1 made of a copper alloy to the aluminum wire W having a conductor cross-sectional area of 2 mm ² , as shown in FIG. Mechanical connectivity and electrical connectivity were evaluated for those having various dimensional relationships in the graph with the area x as the horizontal axis and the aluminum wire W step difference y as the vertical axis. In this evaluation test, the distance le from the terminal longitudinal direction midpoint of the taper crimping portion 13 to the tip of the aluminum electric wire conduction crimping portion 11 and the aluminum wire holding crimping portion from the midpoint of the taper crimping portion 13 in the terminal longitudinal direction. The dimensional relationship of the distance lt (see FIG. 7) to the rear end of 12 was crimped with le: lt = 5: 5. Then, as shown in FIG. 8, the dimensional relationship crimp terminals having no problem in mechanical connectivity and electrical connectivity are marked with ◯, the problematic dimensional relationship crimp terminals are marked with X, and the circles are distributed. Two approximate curves that define (define) the range were determined. 0.15 ln x +0.1 ≤ y ≤ 0.2 ln x +0.3 The terminal crimping structure to the aluminum wire W having the dimensional relationship defined by both the mechanical connectivity and the electrical connectivity It was found to be good and preferred.

  Further, from the viewpoint of mechanical connectivity and electrical connectivity, the ratio of the length in the longitudinal direction of the aluminum wire crimping portion 1 between the aluminum wire holding crimping portion 12 and the aluminum wire conducting crimping portion 11 is 7: 3 to 3 : It is preferably within the range of 7. In this case, the length in the longitudinal direction of the aluminum wire holding and crimping portion 12 refers to the length from the middle point of the tapered crimping portion 13 to the rear end of the aluminum wire holding and crimping portion 12 (lt in FIG. 7). The length in the terminal longitudinal direction of the aluminum wire conductive crimp portion 11 refers to the length from the midpoint of the tapered crimp portion 13 to the tip of the aluminum wire conductive crimp portion 11 (le in FIG. 7).

  Next, the process of crimping the aluminum wire crimp terminal 1 according to the present embodiment to the aluminum wire W will be described. As shown in FIG. 9A, first, the aluminum wire crimp terminal 1 is fixed to the base, and the aluminum wire W is positioned at an appropriate position of the aluminum wire crimp terminal 1. That is, the aluminum wire covering portion Wb of the aluminum wire W is positioned in the insulation barrel 1b, and the aluminum wire conductor portion Wa is positioned in the aluminum wire conductive crimping barrel 1a. In this state, a crimping crimping terminal (crimping jig) 101 having a crimp groove having a reverse V-shaped cross section in a direction orthogonal to the longitudinal direction of the aluminum electric wire W and having a M-shaped cross section at the bottom of the groove is made of aluminum. It approaches from the upper direction of the crimp terminal 1 for electric wires (refer arrow X which shows the crimping direction of Drawing 9 (a)).

  The crimping groove of the terminal crimping crimper 101 is formed by an edge shape corresponding to the aluminum wire conductive crimping portion 11, the aluminum wire holding crimping portion 12, the tapered crimping portion 13, and the insulating coating crimping portion. That is, the crimping groove of the terminal crimping crimper 101 corresponding to the aluminum wire conductive crimping part 11 is formed so as to protrude most in the crimping direction, and then the crimping groove of the terminal crimping crimper 101 corresponding to the tapered crimping part 13 is A crimping groove of a terminal crimping crimper 101 corresponding to the aluminum wire holding crimping portion 12 is formed, and then a terminal crimping corresponding to the aluminum wire W insulation coating crimping portion is formed. A crimping groove of the crimper 101 is formed.

  Then, the terminal crimping crimper 101 is lowered toward the aluminum electric wire crimping terminal 1 by an actuator (not shown) (see FIGS. 9A and 9B). Along with this, the upper portions of the aluminum wire conductive crimping barrel 1a and the insulation barrel 1b, which have been erected, are gradually bent along the crimping groove of the terminal crimping crimper 101. Each barrel side portion is deformed (curled) in the direction of the central axis of the aluminum electric wire W as shown in FIG.

  Further, the terminal crimping crimper 101 is further lowered to crimp the aluminum wire W conduction crimping barrel to the aluminum wire conductor portion Wa, and the aluminum wire conduction crimping portion 11, the tapered crimping portion 13, and the aluminum wire holding crimping portion 12. Are formed continuously in the longitudinal direction of the terminal, and the insulation barrel 1b is crimped to the aluminum wire covering portion Wb to form the aluminum wire covering crimping portion 15. When this terminal crimping operation is completed, as shown in FIG. 9D, the terminal crimping crimper 101 is raised (see arrow Y in the figure) to complete the terminal crimping process.

  As described above, when the aluminum wire is crimped, the aluminum wire conductive crimping portion 11 and the aluminum wire holding crimping portion 12 having different heights in the crimping direction are formed, so that the thin brass plate is stretched in the boundary region. Since the region is not provided with serrations 2b and is a flat region, the occurrence of cracks in the boundary region can be reduced. Further, since the aluminum wire conductive crimping portion 11 is crimped to the aluminum wire W at a high crimping rate, the base portion 200 of the aluminum wire conductive crimping portion 11 is also extended with a thin plate-like brass, but the portion is also provided with serrations 2b. Since it is not made into the 2nd flat area | region, generation | occurrence | production of the crack in the said part can be reduced.

  In the present embodiment, the grooves 21a and 21b or the grooves 23 or the ridges 24 and 25 constituting the serrations 2a and 2b are continuously formed in a direction corresponding to the circumferential direction of the aluminum electric wire W. However, it may be formed intermittently as shown in FIG. Furthermore, as shown in FIG. 10B, serrations may be formed by aligning a plurality of protrusions or depressions in a direction corresponding to the circumferential direction of the aluminum electric wire W. In this case, the shape of the protrusion or the depression is not limited, and for example, it may be formed in a columnar shape, a prismatic shape, a quadrangular pyramid shape, a triangular pyramid shape, or a conical shape. Further, in the present embodiment, the grooves 21a and 21b or the grooves 23 or the ridges 24 and 25 constituting the serrations 2a and 2b are formed in a straight line extending in a direction corresponding to the circumferential direction of the aluminum electric wire W. However, it may be formed in a zigzag shape as shown in FIG. Further, as shown in FIG. 10D, it may be formed in a slanted line shape, or may be formed in a mesh shape.

  Further, in the present embodiment, the second flat region is formed in the base portion 200 of the aluminum wire conductive crimping portion 11, but this portion is formed by connecting the aluminum wire conductive crimping portion 11 and the aluminum wire at the time of aluminum wire crimping. Since the thin plate-like brass is not stretched as far as the boundary region with the holding crimping portion 12, as shown in FIG. 11, two strips are formed over the entire length corresponding to the circumferential direction of the aluminum wire W of the aluminum wire conducting crimping portion 11. (Concavity) 28 may be formed to provide serrations. In this case, the thickness of the groove (recess) 28 (thick plate-like brass plate thickness) is larger than that of the other groove (recess) 21b, that is, the depth of the groove (recess) 28 may be made shallower. At this time, the thickness of the concave portion of only the base portion 200 may be larger than that of other portions. Thereby, even if the said part is extended at the time of aluminum wire crimping, it becomes difficult to produce a crack. In addition, although serration was provided by forming the two groove | channels 28, a number, a shape, etc. are not limited to this.

  Further, in the present embodiment, a flat region is formed across the base 200 and both side portions 201, 201 in the boundary region between the aluminum wire conductive crimping portion 11 and the aluminum wire holding crimping portion 12, but FIG. As shown in the figure, a serration region may be provided on the base 200, and flat regions may be formed on both side portions 201, 201. Here, the boundary area between the two side portions 201 and 201 is different in compression rate between the aluminum wire conductive crimp portion 11 and the aluminum wire holding crimp portion 12 when crimping to the aluminum wire W when crimping to the aluminum wire W. This is a portion where the thin brass plate is stretched to such an extent that a crack is generated when serration is provided due to the level difference, for example, a side surface portion when a U-shaped open surface is used as the top surface in the cross-sectional shape.

  Further, in the present embodiment, the boundary region between the aluminum wire conductive crimping portion 11 and the aluminum wire holding crimping portion 12 is continuously formed through the tapered surface, but as shown in FIGS. 13 and 14. In addition, the aluminum wire conductive crimping portion 51 and the aluminum wire holding crimping portion 52 are continuously formed through a surface 53 substantially perpendicular to the longitudinal direction of the aluminum wire W without forming a tapered surface. Also good. Even in this case, since the boundary region between the aluminum wire conductive crimping portion 51 and the aluminum wire holding crimping portion 52 is a flat region, it is possible to reduce the occurrence of cracks even if the portion is extended. Can do.

DESCRIPTION OF SYMBOLS 1 Aluminum wire crimping terminal 1a Aluminum wire conductive crimping barrel 1b Insulation barrel 110 Terminal connection part 111 Wire connection part 11 Aluminum wire conduction crimping part 12 Aluminum wire holding crimping part 13 Tapered crimping part 2a Serration 21a Recess (slave) )
22a Convex part 2b Serration 21b Concave part (slot)
22b Convex part W Aluminum electric wire Wa Aluminum electric wire conductor Wb Aluminum electric wire covering part

Claims (4)

For aluminum wire conductive crimping, comprising: a base portion on which an aluminum wire conductor portion from which an aluminum wire coating has been removed is placed; and a side portion formed continuously from the base portion for winding and crimping the aluminum wire conductor portion. With a barrel,
While having a serration area in which serrations are formed on the surface of the aluminum wire conductive crimping barrel in contact with the aluminum wire conductor portion,
When the barrel for aluminum wire conductive crimping is crimped to the aluminum wire conductor part, the aluminum wire conductor crimping part and the aluminum wire conductor part for holding and crimping the oxide film of the aluminum wire conductor part are held. A crimp terminal for an aluminum wire having a flat region in which the serration is not formed at least in the side portion of a boundary region with a portion to be an aluminum wire holding and crimping portion.   2. The second flat region in which the serration is not formed at least at the base portion on the side of the aluminum wire conductive crimping portion with respect to the boundary region of the aluminum wire conductive crimping barrel. Crimp terminals for aluminum wires as described in 1. The serration consists of a convex part and a concave part,
The serration having a recess larger in thickness than the recess constituting the serration of another portion is formed at least in the base portion on the aluminum wire conductive crimp portion side of the boundary region of the aluminum wire conductive crimp barrel. The crimp terminal for an aluminum electric wire according to claim 1, wherein the terminal is a crimp terminal. A terminal crimping structure to an aluminum electric wire using the aluminum electric wire crimping terminal according to any one of claims 1 to 3,
The height of the aluminum wire conduction crimping part in the crimping direction is lower than the height of the aluminum wire holding crimping part,
A terminal crimping structure to an aluminum wire, wherein a boundary region between the aluminum wire conduction crimping portion and the aluminum wire holding crimping portion has a tapered surface.

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