JP4067297B2 - Piercing terminal connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a piercing terminal, and more particularly to a piercing terminal connection structure in which a cable wire in which a core wire formed by twisting a plurality of strands is covered with an insulating coating material is electrically connected to the piercing terminal. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a wire harness for an automobile or the like, a connection terminal using a so-called press contact blade as shown in FIG. 7 is used to connect a terminal portion of a cable electric wire having a stranded wire in which a large number of strands are twisted together as a core wire. Is used.
[0003]
The connection terminal 100 by the press contact blade has a cable electric wire 110 on the other end side of the rectangular tube-shaped fitting tube portion 101 having an insertion port of a connection terminal (in this example, a male terminal) of the mating connector at one opening end. A connecting portion 102 that electrically connects the terminal portions of the cable wire 110 is integrally provided. The connecting portion 102 is a base frame having a substantially concave cross section that is long in the axial direction of the cable wire 110 to be connected. A pair of inward pressure contact blades 105L, 105R, and 105L, 105R, which are paired, are formed on both side wall plates 104L, 104R in the width direction 103.
[0004]
When the cable wire 110 is attached to the slots 106 and 106 formed between the pair of press contact blades 105L and 105R and 105L and 105R, the terminal portion of the cable wire 110 is connected to the press contact blade type connection terminal. The insulation coating material 112 of the cable wire 110 is torn by the respective pairs of press contact blades 105L, 105R, and 105L, 105R, and the core wires 111, 111... Of the cable wire 110 are directly connected to the press contact blades as shown in FIG. 105L, 105R and 105L, 105R are in contact with each other and are pressure-connected. Such a press contact blade type connection terminal has an advantage that the connector can be connected by a simple processing operation without peeling off the insulation coating material 112 at the end portion of the cable electric wire 110.
[0005]
However, in such a connection terminal using a conventional press contact blade, an electrical conduction state can be obtained by attaching the cable wire core wire with the press contact blade. In the case of a thin core wire having a small diameter and a small number of strands, there is a problem that the strand breaks due to the contact load of the press contact blade.
[0006]
Even if the number of strands is increased to increase the diameter of the core wire, the contact load is still concentrated on the strands located outside the core wire, the outer strands are cut, and the contact pressure is reduced by the pressure welding blade. There is a problem that the contact state between the blade and the core wire becomes unstable, and the reliability for power transmission and transmission / reception is impaired.
[0007]
The problem to be solved by the present invention is that a cable wire having a stranded wire formed by twisting a plurality of strands as a core wire can be connected to a connector by a simple processing operation using a piercing terminal, and the cable wire is configured. Another object of the present invention is to provide a piercing terminal connection structure with high reliability of power transmission and communication by avoiding disconnection of each element wire.
[0008]
[Means for Solving the Problems]
In order to solve this problem, the piercing terminal connection structure according to the present invention includes, as described in claim 1, a piercing terminal for a cable electric wire in which a core wire formed by twisting a plurality of strands is covered with an insulating coating material. A piercing terminal connection structure formed by conductive connection with the piercing terminal, wherein the piercing terminal is provided with a fitting portion for fitting and connecting the mating connector terminal on one end side, and connected to the cable electric wire on the other end side. A plurality of pairs of piercing blades are opposed to the left and right side walls of the base portion to which the cable wire is attached, or alternately in the longitudinal direction of the cable wire on the base portion. It is formed upright toward the substantially axial direction of, or facing the cable wires from the left and right sides of portions in the cable wire to be formed alternately with the piercing blade in the axial direction of the cable wires of the right and left side walls While挾着held in have differences, it is an summarized in that said core wire and said pierce blade formed by conductively connected by respective piercing blade is piercing into the insulating coating material of the cable wires.
[0009]
According to this piercing terminal connection structure, since the piercing blades provided on the left and right side walls of the connection portion of the piercing terminal are inserted into the cable electric wire, the core wire of the cable electric wire and the piercing blade are electrically connected. The strands constituting the core wire are not cut by the piercing blade, and contact failure does not occur. In addition, when the piercing blade is inserted into the cable wire introduced into the base, an inward pressing force acts on the cable wire, and a high contact load is generated at the contact portion between the piercing blade and the cable wire. Connection structure can be obtained.
[0010]
Furthermore, since the piercing blade is provided substantially parallel to the longitudinal direction of the cable electric wire, it has a strong connection strength with respect to the direction in which the cable electric wire is pulled out, and there is no fear of falling off from the terminal. In addition, if the width of the piercing blade is secured wide, the contact area between the piercing blade and the core wire can be increased, so that not only the connection reliability between the piercing terminal and the cable wire is further improved but also the conduction state is improved. It can be made better.
[0011]
In this piercing terminal connecting structure, in addition to pierce blade to the left and right side walls of the connecting portion is provided with a plurality of pairs facing, that a plurality of piercing blades provided alternately. If the piercing blades are provided to face each other, when the piercing blade is inserted into the cable electric wire, the contact load is equally applied to the cable electric wire, so that a stable connection state can be obtained. Further, if a plurality of piercing blades are provided oppositely or alternately, the contact strength between the piercing terminal and the cable electric wire is increased, and a connection structure with further excellent connection reliability can be obtained.
[0012]
Also, piercing terminal used in the piercing terminal connection structure, provided to be pierced substantially in the axial direction of the cable wire when piercing blade on the left and right side walls of the connecting portion is piercing inserted into the cable wire Yes . When piercing the piercing blade into a cable electric wire with a circular cross section, if you try to insert the piercing blade away from the axial direction of the cable electric wire, the tip of the piercing blade slides on the surface of the insulation coating material and pierces into the electric wire. There is a risk that it will not be possible. Therefore, it is desirable to insert the piercing blade in the axial direction in order to pierce the cable electric wire having such a shape, and the piercing blade is pierced in the substantially axial direction of the cable electric wire as in the present invention. By providing, the work of inserting the piercing blade can be smoothly and reliably performed. Moreover, if the piercing blade is pierced in the axial direction of the cable electric wire in a slightly downward direction toward the base portion as described in claim 2, the lower end portion of the cable electric wire is bent by the piercing blade and the base portion. It becomes a pressed state, and a stronger connection state is obtained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below in detail with reference to the drawings.
First, the piercing terminal connection structure according to the first embodiment will be described in detail with reference to FIGS. The piercing terminal 10 shown in FIG. 1 is formed by assembling a heat-resistant copper alloy plate by punching, and a fitting portion 11 for fitting and connecting a mating connector connection terminal (not shown) to one end side. The connecting portion 12 for conducting and connecting the cable wire 20 is provided integrally with the fitting portion 11 on the other end side.
[0014]
A plurality of piercing blades 15 a to 15 f formed by cutting and raising the left and right side walls 14 </ b> L and 14 </ b> R of the base portion 13 are alternately provided in the connection portion 12 inwardly and substantially in parallel with the cable wire 20. Each of the piercing blades 15a to 15f is formed in a taper shape so that the end edge portion becomes thinner toward the tip in order to facilitate the insertion of the piercing. When connecting the cable wire 20 to the connecting portion 12, as shown in FIG. 1, the left and right side walls 14L and 14R are provided so that the cable wire 20 can be introduced onto the base portion 13 without being caught by the piercing blades 15a to 15f. Each has an expanded shape. Further, the piercing blades 15a to 15f are cut and raised so that the tip portions thereof are directed in the substantially axial direction of the cable electric wire 20 applied on the base portion 13 (see FIG. 3).
[0015]
As shown in FIG. 1, the cable electric wire 20 that is conductively connected to the piercing terminal includes a plurality of core wires 21, 21,... Composed of a stranded wire in which a plurality of annealed copper wires (element wires) are twisted together. It is bundled and its periphery is covered with an insulating coating material 22 made of synthetic resin.
[0016]
Next, the steps when the cable wire 20 is conductively connected to the piercing terminal 10 will be described in order with reference to FIGS. First, the cable wire 20 is introduced from above into the connecting portion 12 of the piercing terminal in which the left and right side walls 14L, 14R of the base portion 13 are expanded (FIG. 3A). This is true (FIG. 2 and FIG. 3B).
[0017]
Next, the left and right side walls 14L and 14R expanded outward are closed inward, and the piercing blades 15a to 15f provided on the side walls 14L and 14R (in FIG. 3, the piercing blades provided on one side wall are referred to as "15a , 15c, 15e ", and the piercing blades provided on the other side wall are respectively indicated as" 15b, 15d, 15f "). As shown in (d), an electrical conduction state is obtained by being sandwiched between a plurality of core wires 21, 21. FIGS. 3C and 3D show the cross-sectional connection structures in the AA cross section and the BB cross section in FIG. 2, respectively.
[0018]
When the piercing blades 15a to 15f are inserted into the cable electric wire 20, the pressing force from the piercing blades 15a to 15f is applied to the cable electric wire 20, so that a high contact load is generated at the contact portion. . Moreover, as shown in FIGS. 3C and 3D, the piercing blades 15a to 15f are inserted downward inward into the cable electric wire 20, so that the lower end portion of the cable electric wire 20 is connected to the piercing blades 15a to 15f. The base end portion 13 is crushed and a high contact load is generated even at the contact portion between the lower end portion of the cable wire 20 and the base portion 13. Thereby, the connection structure of the piercing terminal 10 and the cable electric wire 20 with high connection reliability is obtained.
[0019]
4 and 5 show a second embodiment of the present invention. As shown in FIG. 4, the piercing terminal 10 used in the piercing terminal connection structure according to this embodiment has a plurality of pairs of piercing blades 15L, 15R, 15L, 15R and 15L, 15R on the left and right side walls 14L, 14R. Are provided opposite to each other. Each piercing blade, like the piercing terminal according to the above-described embodiment, is formed in a tapered shape so that the end edge portion becomes thinner toward the tip in order to facilitate piercing insertion. Further, each of the piercing blades 15L, 15R, 15L, 15R and 15L, 15R is cut and raised so that the tip end portion thereof is directed in the substantially axial direction of the cable electric wire 20 applied to the base portion 13. Note that the structure of the piercing terminal 10 on the fitting portion 11 side is the same as that of the first embodiment, and is omitted, and only the connection portion 12 is shown in FIG.
[0020]
When connecting the cable wire 20 to the piercing terminal 10, as shown in FIG. 5, the cable wire 20 is introduced into the connection portion 12 with the side walls 14 </ b> L and 14 </ b> R having an expanded shape, and is attached to the base end portion 13. This is true (FIG. 5A). Next, the left and right side walls 14L, 14R are closed, and the piercing blades 15L, 15R, 15L, 15R and 15L, 15R formed by cutting and raising the side walls 14L, 14R are inserted into both sides of the cable wire 20 in the axial direction. (FIG. 5B). At this time, the piercing blades 15L, 15R, 15L, 15R and 15L, 15R are electrically connected to the core wires 21, 21 ... in a state of being sandwiched between the plurality of core wires 21, 21 ... ( FIG. 5 (c)).
[0021]
If the piercing blades 15L, 15R, 15L, 15R and 15L, 15R provided so as to face the left and right side walls 14L, 14R are inserted into the cable electric wire 20 in this way, contact occurs at the contact portion between the cable electric wire 20 and the piercing blade. Since the load is equally applied to the left and right, a piercing terminal connection structure with higher connection reliability can be obtained.
[0022]
Furthermore, since the piercing blades 15L, 15R, 15L, 15R and 15L, 15R are respectively inserted downward and inward into the cable electric wire 20, the lower ends of the cable electric wires 20 are pierced blades 15L, 15R, 15L, 15R and 15L, 15R and the base end portion 13 are pressed, and a high contact load is generated at the contact portion between the lower end portion of the cable electric wire 20 and the base portion 13. Thereby, a stronger connection state can be obtained.
[0023]
In the piercing terminal 10 applied to the piercing terminal connection structure according to the above two embodiments, the tip of the piercing blade provided on the left and right side walls 14L, 14R of the connecting portion 12 is applied on the base portion 13. The cable wire is cut and raised so as to be directed substantially in the axial direction of the cable. Therefore, as shown in FIG. 6, the piercing blades 15a to 15f or 15L, 15R, 15L, 15R and 15L, 15R are cut and raised so as to be perpendicular to the left and right side walls 14L, 14R of the base portion 13. There may be.
[0024]
FIG. 6 shows a process of connecting a cable wire to a piercing terminal 10 of a type in which the piercing blades 15L and 15R are provided to face the left and right side walls 14L and 14R. Specifically, the cable electric wire 20 is introduced from above the connecting portion 12 (FIG. 6A), and the left and right side walls are expanded at an appropriate position such that the piercing blades 15L and 15R can pierce the cable electric wire 20. 14L and 14R are closed inward (FIG. 6B), and the piercing blades 15L and 15R are inserted into the cable electric wire 10 in a pierced manner. At this time, the pierced blades 15L and 15R inserted between the plurality of core wires 21, 21... Are electrically conductive (FIG. 6C).
[0025]
Also in this connection structure, when inserting the piercing blades 15L and 15R into a pierced state, a pressing force acts on the cable electric wire 10 and a high contact load is generated at the contact portion. Therefore, excellent connection reliability is achieved. A piercing terminal connection structure can be provided.
[0026]
The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention. For example, the number and dimensions of the piercing blades provided on the side wall of the base portion of the piercing terminal are not limited to those of the above-described embodiment, and can be appropriately changed according to the use environment or the like. Moreover, in the said Example, although the piercing blade is provided so that it may stab in the substantially axial direction of a cable electric wire, it is not restricted to this, It can change suitably according to a connection condition. Further, in the above embodiment, the piercing blade is formed on the taper so that the piercing blade becomes thinner toward the tip, but the sharpness at this time is the size of the cable electric wire to pierce, the material of the insulation coating material, the number of core wires, etc. It is desirable to change appropriately.
[0027]
【The invention's effect】
According to the piercing terminal connection structure according to the present invention, when connecting the cable wire to the piercing terminal, it is possible to connect the conductor by a simple processing operation without peeling off the insulation coating material of the end portion of the cable wire, Unlike the case of conductor connection with the press contact blade, the core wire constituting the cable electric wire is not cut by the press contact blade, and the reliability of power transmission and transmission / reception by stabilization of the conductor connection is high.
[0028]
Also, when connecting the cable wire to the piercing terminal, the pierce blade is pierced by closing the side wall inward to the cable wire introduced to the base of the connection part, and the piercing blade and the multiple core wires are electrically connected In addition, since the piercing blade is provided in the longitudinal direction of the cable, there is no fear of the piercing blade falling off from the cable electric wire, and an extremely stable connection state can be obtained.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a piercing terminal applied to a piercing terminal connection structure according to a first embodiment of the present invention.
2 is an external perspective view showing a state in which a cable wire is introduced into the piercing terminal connecting portion shown in FIG. 1. FIG.
3 is a cross-sectional view showing a process of connecting a cable wire to the piercing terminal connection portion shown in FIG. 1, (a) is a diagram before introducing the cable wire, and (b) the cable wire is installed on the base portion. (C) is a diagram of a state where a piercing blade provided on one side wall is pierced into a cable wire, and (d) is a piercing blade provided on the other side wall and pierced into a cable wire. FIG.
FIG. 4 is an external perspective view of a connection portion of a piercing terminal applied to a piercing terminal connection structure according to a second embodiment of the present invention.
5 is a cross-sectional view showing a process of connecting a cable wire to the piercing terminal connection portion shown in FIG. 4, wherein (a) is a view before introducing the cable wire, and (b) the cable wire is installed at the base portion. The state figure and (c) are figures of the state which pierced the cable electric wire and was connected to the piercing blade provided in the right and left side walls.
6 is a cross-sectional view showing a process of connecting a cable wire to a piercing terminal in which a piercing blade provided on a side wall of a connection portion is perpendicular to the side wall as a modification of the piercing terminal shown in FIG. 4; (A) is a diagram before the introduction of the cable electric wire, (b) is a diagram immediately before the piercing blade is pierced into the cable electric wire, and (c) is a state where the piercing blade provided on the left and right side walls is pierced into the cable electric wire and connected. FIG.
FIG. 7 is an external perspective view of a connection terminal provided with a pressure contact blade used in the prior art, (a) is an external perspective view of the connection terminal, and (b) is a plan view from above of the connection terminal.
8 is a cross-sectional view of a connection structure between a connection terminal provided with the press contact blade shown in FIG. 7 and a cable wire.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Piercing terminal 12 Connection part 13 Base part 14L, 14R Side wall 15a-15f Piercing blade 20 Cable electric wire 21, 21 ... Core wire 22 Insulation coating material

Claims (2)

A piercing terminal connection structure in which a cable wire in which a core wire formed by twisting a plurality of strands is covered with an insulating coating material is electrically connected to a piercing terminal, and the piercing terminal is connected to a mating connector terminal on one end side A fitting part for fitting and connecting is provided, and a connecting part for conducting connection with the cable electric wire is provided on the other end side, and the left and right side walls of the base part to which the cable electric wire is attached to the connecting part A plurality of pairs of piercing blades facing each other or alternately standing up in the longitudinal direction of the cable electric wire on the base portion in a substantially axial direction, and the piercing blades in the axial direction of the cable electric wire out of the left and right side walls. to face the cable wires from the left and right sides of the cable wires at a plurality of portions which are formed alternately with or alternately to挾着held, this the respective piercing blade is piercing into the insulating coating material of the cable wire Piercing terminal connecting structure, characterized in that said core wire and said pierce blade formed by conductively connected by. The piercing terminal connection structure according to claim 1, wherein the piercing blade is pierced in the axial direction of the cable electric wire in a slightly downward direction toward the base portion.

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