JP5058773B2 - Connection structure of crimp terminal to covered wire - Google Patents

Description

  The present invention relates to a connection structure of an open barrel type crimp terminal provided with a U-shaped coated crimp portion to a coated electric wire.

  4A to 4C are diagrams for explaining a connection structure of a conventional general open barrel type crimp terminal to a covered wire, and FIG. FIG. 4B is a perspective view showing a state after the crimp terminal is connected to the covered wire, and FIG. 4C is a connection structure in the state shown in FIG. 4B. FIG.

  As shown in FIG. 4A, the crimp terminal 50 has a counterpart on one end side in the longitudinal direction (hereinafter, this direction is referred to as “front-rear direction” and the direction perpendicular thereto is referred to as “left-right direction”). An electrical connection portion 52 for a terminal or the like is provided, and a conductor crimping portion 53 that is crimped to the exposed conductor 100a at the tip end portion of the covered wire 100 on the other end side, and a sheath that is crimped to a portion of the covered wire 100 that has the insulation coating 100b The caulking portion 54 is provided, and the electrical connection portion 52, the conductor crimping portion 53, and the covering caulking portion 54 are configured to include a common bottom plate portion 51.

  The conductor crimping part 53 is a U-shaped section in which a pair of conductor crimping pieces 53 a are formed upright on both lateral edges of the bottom plate part 51 continuous from the electrical connection part 52. The covering crimping portion 54 is a U-shaped section in which a pair of covering crimping pieces 54 a are erected on both side edges in the left-right direction of the bottom plate portion 51. The conductor crimping part 53 and the covering crimping part 54 are arranged at an appropriate interval in the front-rear direction.

  In order to connect the crimp terminal 50 to a general copper electric wire (that is, the covered electric wire 100), the upper and lower molds are used to bend the pair of conductor crimping pieces 53a so as to draw a curl inside. The conductor crimping portion 53 is crimped to the exposed conductor 100a at the tip end portion of the coated electric wire 100, and the pair of coated crimping pieces 54a are bent so as to draw a curl inward, whereby the coated crimping portion 54 is The portion having the insulating coating 100b is crimped. By performing caulking in this way, a connection structure as shown in FIGS. 4B and 4C is obtained. In this case, in particular, the cover crimping portion 54 is crimped from the front end portion 54f to the rear end portion 54g with a uniform pressing force, and the upper surface formed by bending the cover crimping piece 54a is the bottom plate in the front-rear direction. It is substantially parallel to the part 51.

Japanese Patent Laid-Open No. 7-50191 (FIG. 8)

  By the way, copper wires are generally used for wire harnesses that are routed inside vehicles such as conventional automobiles, but recently, instead of copper wires, the weight of the vehicle has been reduced and the resulting low fuel consumption. In view of the realization and recyclability, there is an increasing demand for using an aluminum electric wire having inferior properties (physical properties) such as conductivity and strength.

  When using an aluminum wire, it has been found that when aluminum or an aluminum alloy is inferior in mechanical strength and tensile strength to copper, application of the terminal connection structure for copper wire as it is causes a problem.

  That is, when the crimp terminal 50 is connected to a conventional copper electric wire, the front end portion 54f to the rear end portion 54g of the covering crimping portion 54 are crimped to the covering electric wire 100 with a substantially uniform pressing force. When the covering crimping portion 54 is crimped in the same manner with respect to the aluminum electric wire, in the case of the aluminum electric wire, the caulking force must be increased by applying a compressive force stronger than that of the copper electric wire. As a result, it was found that stress was applied to the conductor made of aluminum or aluminum alloy having inferior tensile strength, and damage to the conductor made of aluminum or aluminum alloy was increased, and in the worst case, it was easily cut.

  The present invention has been made in view of the above-described circumstances, and the purpose thereof is to connect a crimp terminal to a covered electric wire that can reduce damage to the conductor of the aluminum electric wire even when applied to, for example, an aluminum electric wire. To provide a structure.

In order to achieve the above-described object, the connection structure of the crimp terminal according to the present invention to the covered electric wire is characterized by the following (1) to (3).
(1) A crimped conductor crimping portion having a U-shaped cross section for crimping to the exposed portion of the conductor at the tip of the coated wire, and the portion of the covered wire with an insulation coating around the conductor are fixed by caulking. A cover caulking portion having a U-shaped cross-section for, and a common bottom plate portion provided continuously to the conductor crimping portion and the coating caulking portion,
The conductor crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the conductor of the covered electric wire to be connected, and the conductor is in close contact with the upper surface of the bottom plate portion; Having a pair of conductor crimping pieces to be crimped,
The covering crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the portion with the insulating coating around the conductor of the covered electric wire to be connected. Having a pair of coated crimping pieces for crimping and fixing a coated electric wire,
A connection structure of a crimp terminal to a covered electric wire,
The conductor crimping portion and the covering crimping portion are arranged in parallel in the longitudinal direction of the crimping terminal;
It said longitudinal presses the said covered wire one end strongly the conductor crimping portion of the sheath crimping portion, and the sheath clamping portion of the other longitudinal end portion is the weaker than the one end The insulation coating is cut off by applying a gradient to the crimping strength of the coated crimped piece with respect to the coated wire so as to press the coated wire, and the coated crimped piece is crimped onto the coated wire. To prevent.
(2) In the connection structure having the configuration (1) above,
Before SL sheath clamping piece, the clamped pressure to the coated wire, thereby the bent formed top of the sheath clamping piece is inclined downward forward with respect to the longitudinal direction.
(3) In the connection structure having the above configuration (1) or (2),
The covered electric wire is an aluminum electric wire having a conductor made of aluminum or aluminum alloy as the conductor.

According to the connection structure having the above configuration (1), since the caulking strength by the covering crimping piece is given a gradient, the covering is applied from one end of the crimping terminal in the longitudinal direction of the press contact terminal on the conductor crimping portion side. Compared to the case where the other end portion in the longitudinal direction of the crimping portion is crimped with a uniform strength, damage to the covered electric wire can be reduced.
According to the connection structure having the configuration of (2) above, the coated crimping piece is such that one end of the coated crimping portion strongly presses the coated electric wire and the other end presses the coated electric wire weaker than the one end. However, since the upper surface formed by bending the coated crimping piece is inclined with respect to the longitudinal direction, the restraint on the base end side of the coated electric wire can be loosened. The degree of freedom on the base end side of the covered electric wire can be increased.
According to the crimp terminal having the configuration of the above (3), since it is applied to an aluminum electric wire, damage to an aluminum conductor that is inferior in tensile strength compared to a copper conductor can be reduced.

  According to the present invention, even when applied to an aluminum electric wire, damage to the conductor can be reduced, and a highly reliable terminal connection structure can be obtained.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  FIGS. 1A to 1C are diagrams for explaining a connection structure of a crimp terminal of an embodiment to an aluminum electric wire (hereinafter also referred to as “covered electric wire”), and FIG. FIG. 1 (b) is a perspective view showing a state after the crimp terminal is connected to the covered electric wire, and FIG. 1 (c) is a perspective view of FIG. 1 (b). It is a side view of the connection structure of a state. 2 (a) to 2 (c) are enlarged detailed views of the cover crimping portion in the connection structure shown in FIGS. 1 (b) and 1 (c). FIG. 2 (a) is a plan view, and FIG. ) Is a side sectional view, FIG. 2C is a sectional view taken along the arrow IIc-IIc in FIG. 2B, and FIG. 2D is a sectional view taken along the arrow IId-IId in FIG.

  As shown in FIGS. 1A and 1B, the crimp terminal 10 is formed by press-molding a conductive metal plate, and is a direction in which the covered electric wire 200 extends, that is, For connecting and electrically connecting the other terminal to one end of the longitudinal direction of the crimp terminal 10 (hereinafter, this direction is referred to as “front-rear direction” and the direction orthogonal thereto is referred to as “left-right direction”). An electric connection portion 12 is provided, and the other end portion is covered with an exposed conductor 200a at the tip end portion of the covered electric wire 200 (that is, a conductor composed of a bundle of a plurality of strands in the form of stranded wires and the outer periphery of the conductor). A conductor crimping portion 13 for crimping to the end portion of the covered electric wire 200 provided with the insulating coating 200b, and a portion of the conductor exposed from the insulating coating 200b. Of conductors and insulation coatings 200 A sheath crimping portion 14 for clamping pressure to the portion having, a. The electrical connection portion 12, the conductor crimping portion 13, and the covering crimping portion 14 are configured to include a common bottom plate portion 11.

  The conductor crimping part 13 is a U-shaped section formed so as to stand upright so as to extend a pair of conductor crimping pieces 13 a upward on both lateral edges of the bottom plate part 11 continuous from the electrical connection part 12. Further, the covering crimping portion 14 is a U-shaped section formed so as to stand upright so as to extend a pair of covering crimping pieces 14 a upward on both lateral edges of the bottom plate portion 11. The covering crimping portion 14 and the conductor crimping portion 13 are arranged side by side in the front-rear direction of the crimping terminal 10 (arranged adjacently, more simply). Here, as will be described later, the upper end portion of the covering crimping piece 14a is cut obliquely as necessary in order to provide a gradient in the crimping force on the front end portion 14f side and the rear end portion 14g side.

  In order to connect the crimping terminal 10 to the covered electric wire 200, the conductor crimping portion 13 is bent by curling the pair of conductor crimping pieces 13a inward using an upper die and a lower die. The coated crimping portion 14 is crimped to the portion of the coated electric wire 200 having the insulation coating 200b by crimping the exposed conductor 200a at the tip of the wire and bending the pair of coated crimping pieces 14a so as to draw a curl inside. .

  At this time, it is important that the conductor crimping is performed so that the front end portion 14f side of the coated crimping portion 14 strongly presses the coated electric wire 200 and the rear end portion 14g side presses the coated electric wire 200 weaker than the front end portion 14f side. In other words, the conductor crimping piece 14a is crimped to the portion of the covered electric wire 200 having the insulation coating 200b with a gradient in the crimping strength by the piece 14a. By performing caulking in this way, the caulking force on the front end portion 14f side is strong and the caulking force on the rear end portion 14g side as shown in FIG. 1 (b), FIG. 1 (c), and FIG. Thus, a connection structure having the cover crimping portion 14 in which the resistance becomes weak is obtained.

  In this case, since the amount of compression increases on the front end portion 14f side of the covering crimping portion 14, the height H1 of the cross section of the covered electric wire 200 in FIG. 2 (c) and FIG. Since the amount of compression on the rear end portion 14g side of 14 is smaller, the height H1 of the cross section of the covered electric wire 200 is larger than that on the front end portion 14f side. Therefore, when the covering crimping portion 14 is viewed from the side, the upper end portion is inclined forward and inclined.

  Therefore, according to the connection structure of the present embodiment, it is possible to reduce damage to the covered electric wire 200 as compared with the case of crimping with a uniform strength from the front end portion to the rear end portion as in the prior art. In particular, since the present embodiment is applied to the aluminum electric wire 200, damage to an aluminum or aluminum alloy conductor that is inferior in tensile strength to a copper conductor can be reduced. Further, even when the insulating coating 200b of the covered electric wire 200 is a resin containing a halogen element, the insulating coating 200b can be effectively prevented from being cut. As a specific example of the aluminum alloy, an alloy of aluminum and iron can be given. When the said aluminum alloy is employ | adopted, it is easy to extend compared with the conductor made from aluminum, and intensity | strength (especially tensile strength) can be increased.

  Further, in this embodiment, the conductor crimping piece is such that the front end portion 14f side of the conductor crimping portion 14 strongly presses the covered electric wire 200, and the rear end portion 14g side presses the covered electric wire 200 weaker than the front end portion 14f side. Since the caulking strength by 14a is given a gradient, the restraint on the base end side of the covered electric wire 200 can be loosened, and the degree of freedom on the base end side of the covered electric wire 200 can be increased.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, as in the example of the connection structure of the crimp terminal 10B in FIG. 3, the direction in which the caulking force is given a gradient may be set in reverse. That is, the crimping by the conductor crimping piece 14a is performed so that the rear end portion 14g side of the coated crimping portion 14B strongly presses the coated electric wire 200 and the front end portion 14f side presses the coated electric wire 200 weaker than the rear end portion 14g side. The conductor crimping piece 14a may be crimped to the covered electric wire 200 with a gradient in strength.

Fig.1 (a)-(c) is a figure for demonstrating the connection structure to the covered electric wire of the crimp terminal of embodiment, Comprising: Fig.1 (a) is a state which is going to insert a covered electric wire into a crimp terminal. FIG. 1B is a perspective view showing a state after the crimp terminal is connected to the covered electric wire, and FIG. 1C is a side view of the connection structure in the state shown in FIG. 2 (a) to 2 (c) are enlarged detailed views of the cover crimped portion in the connection structure of FIGS. 1 (b) and 1 (c). FIG. 2 (a) is a plan view and FIG. 2B is a sectional side view, FIG. 2C is a sectional view taken along arrow IIc-IIc in FIG. 2B, and FIG. 2D is a sectional view taken along arrow IId-IId in FIG. It is a side view of other embodiment of this invention. 4A to 4C are diagrams for explaining a connection structure of a conventional general open barrel type crimp terminal to a covered wire, and FIG. FIG. 4B is a perspective view showing a state after the crimp terminal is connected to the covered wire, and FIG. 4C is a connection structure in the state shown in FIG. 4B. FIG.

Explanation of symbols

10: Crimp terminal 11: Bottom plate portion 13: Conductor crimp portion 14: Cover crimp portion 14a: Cover crimp piece 200: Aluminum wire (cover wire)
200a: Exposed conductor 200b: Insulation coating

Claims (3)

A cross-section for crimping and fixing a portion of the covered electric wire with an insulating coating around the conductor, and a U-shaped cross-section conductor crimp portion for crimping the exposed portion of the conductor at the tip of the covered electric wire A U-shaped covering caulking portion, and a common bottom plate portion provided continuously to the conductor crimping portion and the covering caulking portion,
The conductor crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the conductor of the covered electric wire to be connected, and the conductor is in close contact with the upper surface of the bottom plate portion; Having a pair of conductor crimping pieces to be crimped,
The covering crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the portion with the insulating coating around the conductor of the covered electric wire to be connected. Having a pair of coated crimping pieces for crimping and fixing a coated electric wire,
A connection structure of a crimp terminal to a covered electric wire,
The conductor crimping portion and the covering crimping portion are arranged in parallel in the longitudinal direction of the crimping terminal;
It said longitudinal presses the said covered wire one end strongly the conductor crimping portion of the sheath crimping portion, and the sheath clamping portion of the other longitudinal end portion is the weaker than the one end The insulation coating is cut off by applying a gradient to the crimping strength of the coated crimped piece with respect to the coated wire so as to press the coated wire, and the coated crimped piece is crimped onto the coated wire. A structure for connecting a crimp terminal to a covered electric wire, characterized by prevention. Claims before Symbol sheath clamping piece, is crimped to the covered wire, whereby bent formed top of the sheath clamping piece characterized in that it inclined downward forward with respect to the longitudinal direction The connection structure of the crimp terminal according to Item 1 to a covered electric wire.   The connection structure to the covered electric wire of the crimp terminal according to claim 1 or 2, wherein the covered electric wire is an aluminum electric wire having a conductor made of aluminum or aluminum alloy as the conductor.

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