JP2014164843A - Wire harness and terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire harness and a terminal, which can surely break an oxide coating of an aluminum conductive wire by increasing a contact area between a locking portion and the conductive wire.SOLUTION: A terminal 1 is used in which a serration 13 composed of a serration 13b having an inclination of a positive direction with respect to a circumferential direction and a serration 13a having an inclination of a negative direction with respect to the circumferential direction are arranged on an inner peripheral surface 57 of a conductive wire crimping portion 7. A coated conductive wire 23 is inserted into a tubular crimping portion 5 and a conductive wire 25 of the coated conductive wire 23 is arranged in the conductive wire crimping portion 7. Next, the crimping portion 5 is placed on a lower crimping blade die 31, and an upper crimping blade die 33 and the lower crimping blade die 31 pinch the crimping portion 5 and make the crimping portion 5 be deformed into a U-shape to crimp the conductive wire 25. After crimping a contact area between the serration 13 and the conductive wire 25 provided at the conductive wire crimping portion 7a becomes larger in comparison with the case in which the a serration of the circumferential direction is provided.

Description

  The present invention relates to a wire harness and a terminal.

  Conventionally, a terminal composed of a crimping portion and a terminal main body is used as a terminal connected to the coated conductor. On the crimping surface of the crimping part, a latching part called serration is formed at a predetermined interval in the longitudinal direction so as to latch a part of the conducting wire, and the coated conducting wire is crimped to the terminal by the crimping part. (For example, refer to Patent Document 1). Serration prevents the lead wire from coming out of the crimping part by biting into the lead wire exposed from the coating of the coated lead wire at the time of crimping.

  However, when connecting the coated conductor and the terminal, a gap is likely to be formed between the conductor and the crimping part, and the conductor may be exposed to the outside air or water to cause corrosion. In recent years, aluminum conductors have been used to reduce the weight of wire harnesses. However, when connecting aluminum conductors and copper terminals, the contact portion between the conductors of different metals and the terminals is water. May intrude and cause electrolytic corrosion (see, for example, Patent Document 2).

JP 2012-009178 A JP 2012-190635 A

  For the purpose of preventing such intrusion of moisture and the like, a terminal having a crimped portion having a hollow cross section and sealed at one end side has been studied. In a terminal having a crimp section with a hollow cross-section, the crimp section where the coated conductor is disposed is deformed into a U-shape or the like, and the conductor is compressed and flowed outward from the center of the cross section of the crimp section. Crimp the coated conductor. Moreover, it is prevented that water penetrate | invades into a hollow part because a coating | coated part is crimped | bonded by a crimping | compression-bonding part. Here, when the conducting wire is made of aluminum, by providing serrations in the crimping part, not only the conducting wire is prevented from coming off but also an effect of destroying the aluminum oxide film can be obtained.

  However, when using a terminal having a crimp section with a hollow cross-section, if the serration positions overlap on the upper and lower surfaces of the crimp section during crimping, the conductor is not sufficiently compressed and the aluminum oxide film is destroyed. May be reduced.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to reliably destroy the oxide film of the aluminum conductor by increasing the contact area between the locking portion and the conductor. It is providing the wire harness and terminal which can do.

  In order to achieve the above-described object, the first invention is a wire harness in which a coated conductor and a terminal are connected, and the terminal is exposed from a coated wire crimping portion for crimping the coated wire and the coated wire. It has a cylindrical crimping portion comprising a lead crimping portion for crimping a lead, and a terminal main body, and the inner circumferential surface of the lead crimping portion is inclined at a predetermined angle with respect to the circumferential direction orthogonal to the longitudinal direction. A linear locking portion having at least two kinds of inclinations, inserting the covered conducting wire into the cylindrical crimping portion, deforming the crimping portion, and crimping the conducting wire. This is a characteristic wire harness.

In the first invention, for example, it is desirable that the at least two kinds of inclinations include a positive inclination and a negative inclination with respect to the circumferential direction, and the locking portions intersect each other.
The linear locking portion is preferably a continuous groove or a plurality of concave portions continuously arranged at a predetermined interval.

  According to the first aspect of the present invention, the locking portion having an inclination of a predetermined angle with respect to the circumferential direction orthogonal to the longitudinal direction is disposed on the inner peripheral surface of the conductor crimping portion with at least two types of inclination. For example, when the lead wire is crimped by deforming the crimp portion into a shape having a convex bottom surface, the contact between the catch portion and the lead wire is compared to the case where the catch portion is provided in the circumferential direction. The area can be increased, and the oxide film of the aluminum conductor can be reliably destroyed.

  2nd invention consists of a terminal main body and a cylindrical crimping | compression-bonding part, Comprising: It is a terminal connected to a covered conducting wire, Comprising: The said crimping | crimped part is exposed from the said covered wire and the covered wire crimping part which crimps | bonds a covered wire A lead wire crimping portion for crimping the lead wire, and at least two types of linear locking portions having a predetermined angle of inclination with respect to the circumferential direction orthogonal to the longitudinal direction on the inner peripheral surface of the lead wire crimping portion. The terminals are arranged with an inclination of.

In the second invention, it is desirable that the at least two kinds of inclinations include a positive inclination and a negative inclination with respect to the circumferential direction, and the locking portions intersect each other.
The linear locking portion is preferably a continuous groove or a plurality of concave portions continuously arranged at a predetermined interval.

  In the terminal of the second invention, a locking portion having an inclination of a predetermined angle with respect to the circumferential direction orthogonal to the longitudinal direction is arranged on the inner peripheral surface of the conductor crimping portion with at least two types of inclination. The Therefore, for example, when deforming the crimping part into a shape in which the lower surface side is convex and crimping the conductor, the contact area between the latching part and the conductor is larger than when the latching part is provided in the circumferential direction. The oxide film on the aluminum conductor can be reliably destroyed by increasing the size.

  ADVANTAGE OF THE INVENTION According to this invention, the wire harness and terminal which can destroy the oxide film of an aluminum conducting wire reliably can be provided by enlarging the contact area of a latching | locking part and conducting wire.

The figure which shows the state which expanded a part of terminal 1 The figure which shows the terminal 1 and the covering conducting wire 23 The figure which shows the process of forming the wire harness 61 The figure which shows the other terminal 1a Cross section in the circumferential direction of the crimping part 5c

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a state in which a part of the terminal 1 is developed. FIG. 2 is a diagram showing the terminal 1 and the covered conductor 23.

  As shown in FIGS. 1 and 2, the terminal 1 includes a terminal body 3 and a crimping portion 5. The terminal 1 is made of copper. The terminal body 3 is formed by forming a plate material having a predetermined shape into a cylindrical body having a rectangular cross section as shown in FIG. The terminal body 3 has a terminal contact portion 11 formed by folding a plate material into a rectangular cylinder at the end opposite to the crimping portion 5.

  As shown in FIG. 2, the crimping portion 5 is formed by rounding the plate material having the shape shown in FIG. 1 so as to form a cylindrical body having a circular cross section, and the side edge portions 19 (FIG. 1) are welded by laser welding or the like 21. It is formed by integrating. The crimp portion 5 includes a covered wire crimp portion 9 and a conductive wire crimp portion 7. The covered wire crimping portion 9 crimps the covered wire 27 of the covered conductor 23 shown in FIG. The lead wire crimping portion 7 crimps the lead wire 25 exposed by peeling off the coating 29 of the covered wire 27. The conducting wire 25 is made of aluminum.

  As shown in FIG. 1, serrations 13, which are linear locking portions, are arranged on the left half portion and the right half portion of the lead wire crimping portion 7, respectively. The serration 13 is a groove that continues in a concave shape on the inner surface. The serration 13 is W-shaped, and the serration 13a is disposed with an inclination indicated by an angle 41 with respect to a direction orthogonal to the longitudinal direction of the crimping portion 5 and the serration is disposed with an inclination indicated by an angle 43. 13b.

  FIG. 3 is a diagram illustrating a process of forming the wire harness 61. FIG. 3A shows the terminal 1. In Fig.3 (a), a part of crimping | compression-bonding part 5 is cut | disconnected and shown in the longitudinal direction. Here, with respect to the circumferential direction orthogonal to the longitudinal direction of the crimping portion 5, the bottom 15 side is inclined in the direction of the end 63 on the terminal body 3 side of the crimping portion 5, and the top 17 side is inclined in the direction of the other end 59. Is the positive slope. A case where the top 17 side is inclined in the direction of the end 63 on the terminal body 3 side of the crimping portion 5 and the bottom 15 side is inclined in the direction of the other end 59 is defined as a negative inclination.

  As shown in FIG. 3A, the serration 13b has a positive inclination with respect to the circumferential direction, and the serration 13a has a negative inclination with respect to the circumferential direction. The serrations 13 a and the serrations 13 b are arranged so as to intersect near the bottom 15 and the top 17 of the crimping part 5.

  FIG. 3B is a view showing a state in which the covered conductor 23 is inserted into the cylindrical crimp portion 5. In FIG.3 (b), a part of crimping | compression-bonding part 5 is cut | disconnected and shown in the longitudinal direction. In order to form the wire harness 61, first, the covered conductor 23 is inserted into the cylindrical crimping part 5 shown in FIG. 3A as shown in FIG. 3B, and the conductor 25 of the covered conductor 23 is connected to the conductor. It arranges in the crimping part 7. Further, the covered wire 27 is disposed in the covered wire crimping portion 9.

  FIG.3 (c) is a figure which shows the state which installed the crimping | compression-bonding part 5 in the crimping blade type | mold. FIG. 3C illustrates a cross section at the position of the conductor crimping portion 7. In the step shown in FIG. 3C, the crimping part 5 is installed on the lower crimping blade mold 31. The crimping part 5 is installed so that the top part 17 faces the upper crimping blade mold 33.

  FIG. 3D is a diagram showing a state where the crimping portion 5 is deformed. In the step shown in FIG. 3D, the crimping portion 5 is sandwiched between the upper crimping blade die 33 and the lower crimping blade die 31, and the crimping portion 5 is deformed into a U-shape so that the lower surface is convex. 25 is crimped. The conducting wire 25 flows from the central portion 35 of the circumferential cross section of the conducting wire crimping portion 7 to the side portion 37 and is crimped. At this time, the conductor crimping portion 7 is provided with serrations 13a and serrations 13b with two different inclinations in the positive direction and the negative direction with respect to the circumferential direction orthogonal to the longitudinal direction. For this reason, compared with the case where serrations are provided in parallel with each other in the circumferential direction, the contact area between the serrations 13 and the conductive wires 25 increases.

  Moreover, since the conducting wire 25 tends to flow along each serration, it flows so that the surface of the conducting wire 25 is divided into two directions. Therefore, the oxide film of the aluminum conducting wire 25 can be reliably destroyed over a wide range.

  FIG. 3E is a diagram showing the wire harness 61. In FIG.3 (e), a part of crimping | compression-bonding part 5 is cut | disconnected and shown in the longitudinal direction. In the step shown in FIG. 3E, the crimping part 5 is removed from the crimping blade mold, and the wire harness 61 is completed. In the wire harness 61, since the oxide film of the aluminum conducting wire 25 is reliably destroyed in a wide range, the contact resistance between the conducting wire 25 and the crimping portion 5 does not increase, and stable electrical characteristics can be obtained. .

  As described above, in the first embodiment, the inner circumferential surface 57 of the conductor crimping portion 7 has two different inclinations in the positive direction and the negative direction with respect to the circumferential direction orthogonal to the longitudinal direction of the crimping portion 5. A terminal 1 on which serrations 13a and 13b are arranged is used. Thereby, when the crimping portion 5 is deformed into a U-shaped shape such that the lower surface side is convex, and the conducting wire 25 is caused to flow from the central portion 35 of the circumferential cross section of the conducting wire crimping portion 7 to the side portion 37 and crimped, Compared with the case where circumferential serrations are provided, the contact area between the serrations 13 and the conductors 25 is increased, and the oxide film of the aluminum conductors 25 can be reliably destroyed over a wide range. In particular, such an effect is exhibited when the conducting wire 25 is made of aluminum.

  Moreover, by making the shape of the serration 13 seen from the side of the conductor crimping portion 7 W-shaped, the position of the serration 13 does not overlap between the upper surface side and the lower surface side of the conductor crimping portion 7 during crimping. For this reason, compared with the case where the position of serrations matches up and down, when compressing the conducting wire crimping part 7 from above and below, it is possible to reduce the influence of the decrease in the compression amount according to the depth of serration. For this reason, compression of the conducting wire 25 does not become insufficient, and the oxide film of the conducting wire 25 can be more reliably destroyed.

  2, 3 (a), 3 (b), and 3 (e), the cross section of the end 63 on the terminal body 3 side of the crimping portion 5 is shown in the same shape as the cross section of the lead wire crimping portion 7. However, the shape of the end portion 63 is not limited to this. The end portion 63 is preferably crushed and sealed so that the opening is closed in order to prevent corrosion of the conducting wire 25 due to intrusion of moisture or the like.

  Next, a second embodiment will be described. FIG. 4 is a diagram showing another terminal 1a. In 2nd Embodiment, the terminal 1a which has the crimping | compression-bonding part 5a shown in FIG. 4 is used instead of the terminal 1 which has the crimping | compression-bonding part 5 shown in FIG. As shown in FIG. 4, the crimping part 5a includes a covered wire crimping part 9 and a conductor crimping part 7a.

  Fig.4 (a) is an expanded view of the crimping | compression-bonding part 5a of the terminal 1a. As shown in FIG. 4A, serrations 39, which are linear locking portions, are arranged on the left half and the right half of the lead wire crimping portion 7a, respectively. The serration 39 is a groove that continues in a concave shape on the inner surface. The serration 39 includes a serration 39a disposed with an inclination indicated by an angle 45 with respect to a direction orthogonal to the longitudinal direction of the crimping portion 5a, and a serration 13b disposed with an inclination indicated by an angle 47.

  FIG. 4B is a diagram showing the terminal 1a having the crimping part 5a. In FIG.4 (b), a part of crimping | compression-bonding part 5a is cut | disconnected and shown in the longitudinal direction. Here, with respect to the circumferential direction orthogonal to the longitudinal direction of the crimping portion 5a, the bottom 15 side is inclined in the direction of the end 63 on the terminal body 3 side of the crimping portion 5a, and the top 17 side is inclined in the direction of the other end 59. Is the positive slope. Further, a case where the top portion 17 side is inclined in the direction of the end portion 63 on the terminal body 3 side of the crimping portion 5a and the bottom portion 15 side is inclined in the direction of the other end portion 59 is defined as a negative direction inclination.

  As shown in FIG. 4B, the serration 39b has a positive inclination with respect to the circumferential direction, and the serration 39a has a negative inclination with respect to the circumferential direction. The serration 39a and the serration 39b are arranged so as to intersect in the vicinity of the center of the bottom portion 15 and the top portion 17 of the crimping portion 5.

  The method for forming the wire harness using the terminal having the crimping part 5a shown in FIG. 4 is the same as that in the first embodiment. In order to form a wire harness, first, a covered conductor is inserted into the cylindrical crimp part 5a, and the conductor of the covered conductor is placed in the conductor crimp part 7a. Further, the covered wire is disposed in the covered wire crimping portion 9. Then, the crimping part 5a is installed in the lower crimping blade mold, the crimping part 5a is sandwiched between the upper crimping blade mold and the lower crimping blade mold, and the crimping part 5a is deformed into a U-shape that has a convex bottom surface. Then, after crimping the conducting wire, the crimping portion 5a is removed from the crimping blade mold to complete the wire harness.

  Thus, in 2nd Embodiment, it has two different inclinations of the positive direction and the negative direction with respect to the circumferential direction orthogonal to the longitudinal direction of the crimping | compression-bonding part 5a in the inner peripheral surface 57 of the conducting wire crimping part 7a. A terminal 1a on which serrations 39a and 39b are arranged is used. As a result, when the crimping portion 5a is deformed into a U-shape such that the lower surface side is convex, and the conducting wire is caused to flow from the central portion of the circumferential cross section of the conducting wire crimping portion 7a to the side portion and crimped, the circumferential direction Compared to the case where serrations are provided, the contact area between the serrations 39 and the conductive wires is increased. Moreover, the oxide film of the aluminum conductive wire can be reliably destroyed over a wide range, and stable electrical characteristics can be obtained.

  In FIG. 4B, the cross section of the end portion 63 on the terminal main body 3 side of the crimp portion 5a is illustrated in the same shape as the cross section of the conductor crimp portion 7a, but the shape of the end portion 63 is not limited thereto. As with the end 63 of the crimping part 5 of the terminal 1 in the first embodiment, the end 63 on the terminal body 3 side of the crimping part 5a has an opening to prevent corrosion of the conductor 25 due to intrusion of moisture or the like. It is desirable to crush it so as to close it and seal it with laser welding or the like.

  In the first and second embodiments, it has been described that it is desirable to seal one end 63 of the crimping portion by welding. However, in the present invention, even if one end 63 is sealed. When no gap is formed between the side edge portions 19 of the crimping portion in the range where the covered conductor 23 is inserted, it is referred to as a “tubular” crimping portion.

  In the first and second embodiments, the terminals in which serrations having two different inclinations of the positive direction and the negative direction are arranged with respect to the circumferential direction orthogonal to the longitudinal direction of the crimping part are illustrated. The arrangement is not limited to this. The serration may have three or more different inclinations with respect to the circumferential direction orthogonal to the longitudinal direction of the crimping portion.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs.

  For example, the linear locking portion in the present invention is not limited to serrations that are continuous grooves. Instead of serrations, other locking portions may be provided as the locking portions. The locking portion is, for example, one in which a plurality of concave portions are continuously arranged linearly at a predetermined interval. The planar shape of the recess is a circle, rectangle, parallelogram or the like.

  Moreover, in this invention, you may crimp | bond a crimping | compression-bonding part so that it may become another cross-sectional shape instead of the cross-sectional shape shown in FIG.3 (d). FIG. 5 shows a cross-sectional view in the circumferential direction of the crimping part 5c. The lead wire crimping portion 7c of the crimping portion 5c shown in FIG. 5 is crimped from four locations indicated by arrows A and B by a crimping blade mold, and deformed into a shape in which the lower surface side is convex. In the crimping part 5c, the conducting wire 25 flows from the central part 77 toward the side part 79 by the crimping.

  5 is pressed from the two locations indicated by the arrow A on the upper side and the two locations indicated by the arrow B on the lower side, so that the terminal can be prevented from rotating during the crimping. Moreover, since the crimping | compression-bonding part 5c becomes flat in a lower surface, the measurement of crimping | compression-bonding height becomes easy.

DESCRIPTION OF SYMBOLS 1 ......... Terminal 3 ......... Terminal body 5, 5a, 5c .... Crimping part 7, 7a, 7c ..... Conductor crimping part 9 ..... Coated wire crimping part 11 ...... Terminal contact part 13, 13a , 13b, 39, 39a, 39b ......... Serration 15 ......... Bottom 17 ......... Top 19 ......... Side edge 21 ......... Welded part 23 ......... Coated conductor 25 ......... Conductor 27 ......... Covered wire 29 ......... Cover 31 ......... Lower crimp blade type 33 ......... Upper crimp blade type 35 ......... Center part 37 ......... Side parts 41, 43, 45, 47 ......... Angle 57 ... ... Inner peripheral surface 59, 63 ... …… End 61 ... …… Wire harness

Claims (4)

A wire harness in which a coated conductor and a terminal are connected,
The terminal includes a tubular crimping portion including a coated wire crimping portion that crimps a coated wire and a conductive wire crimping portion that crimps a conductive wire exposed from the coated wire, and a terminal body.
On the inner peripheral surface of the lead wire crimping portion, linear locking portions having a predetermined angle of inclination with respect to the circumferential direction orthogonal to the longitudinal direction are arranged with at least two types of inclinations,
A wire harness characterized by inserting the covered conducting wire into the tubular crimping portion and deforming the crimping portion to crimp the conducting wire.   2. The wire harness according to claim 1, wherein the at least two kinds of inclinations include a positive inclination and a negative inclination with respect to the circumferential direction, and the locking portions intersect each other. A terminal consisting of a terminal body and a cylindrical crimp part, connected to a coated conductor,
The crimping part is composed of a coated wire crimping part for crimping a coated wire and a conductive wire crimping part for crimping a conductive wire exposed from the coated wire,
A linear locking portion having a predetermined angle of inclination with respect to the circumferential direction orthogonal to the longitudinal direction is disposed on the inner peripheral surface of the conductor crimping portion with at least two types of inclination. Characteristic terminal.   The terminal according to claim 3, wherein the at least two kinds of inclinations include a positive inclination and a negative inclination with respect to the circumferential direction, and the locking portions intersect each other.

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