JP2003168497A - Piercing terminal connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piercing terminal connection structure, by which connection with a cable electric wire is easy, and which also has excellent connection reliability while avoiding disconnection of a strand, which constitutes the electric wire at the time of connection. <P>SOLUTION: The piercing terminal 10 is provided with a connection part 12, which makes the cable electric wire 20 conduct and connect, in its one end side. The right-and-left sidewalls 14L and 14R of a base part 13, to which the cable electric wire 20 is attached, are equipped in this connection part 12 with the widely opened shape. The pierce edges 15a to 15f are formed in these right-and-left sidewalls 14L and 14R towards the cable electric wire 20 on the base 13. By closing the above right-and-left sidewalls 14L and 14R for inner direction, in the state of attaching the cable electric wire 20 on the base 13 of the connection part 12, the above pierce edges 15a to 15f are inserted by poking to the insulated covering material 22 of the cable electric wire 20. And the conduction connection of these pierce edges 15a to 15f and a core wire 11 is made. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piercing terminal, and more particularly, to a piercing terminal in which a cable wire having a core wire formed by twisting a plurality of strands covered with an insulating coating material is conductively connected to the piercing terminal. The present invention relates to a terminal connection structure.

[0002]

2. Description of the Related Art Conventionally, in a wire harness for an automobile or the like, a so-called connector shown in FIG. 7 has been used to connect a terminal portion of a cable wire having a stranded wire formed by twisting a large number of wires as a core wire. A connection terminal using a press contact blade is used.

The connection terminal 100 using this press contact blade is provided on the other end side of a rectangular cylindrical fitting cylinder portion 101 having an insertion port for a connection terminal (a male terminal in this example) of a mating connector at one opening end. The connection portion 102 for electrically connecting the terminal portion of the cable electric wire 110 is provided integrally,
The connecting portion 102 is a pair of inward pressing blades 105L, 105R formed on the widthwise side wall plates 104L, 104R of the base frame 103 having a substantially concave cross section long in the axial direction of the cable electric wire 110 to be connected. And 105L,
105R is formed by cutting and raising.

Then, the end portion of the cable electric wire 110 is connected to each pair of press contact blades 105 by the press contact blade type connection terminal.
When the cable electric wire 110 is attached to each slot 106, 106 formed between L, 105R and 105L, 105R, the insulating coating material 11 of the cable electric wire 110
2 is each pair of press contact blades 105L, 105R, and 105L,
The core wires 111, 111 ... Of the cable electric wire 110 are directly cut into the press contact blades 105L, 105R and 105L, 105R as shown in FIG. According to such a pressure contact blade type connection terminal, there is an advantage that a connector can be connected by a simple processing operation without peeling off the insulating coating material 112 on the end portion of the cable electric wire 110.

However, in such a conventional connection terminal using a pressure contact blade, an electric conduction state is obtained by sandwiching the core wire of the cable wire with the pressure contact blade. In the case of a core wire having a small diameter and a small number of the wires constituting the core wire, there is a problem that the wire breaks and breaks due to the contact load of the press contact blade.

Further, even if the number of wires is increased to increase the diameter of the core wire, the contact load is still concentrated on the wires located outside the core wire, the outer wires are cut, and the contact pressure is reduced by the press contact blade. As a result, the contact state between the press contact blade and the core wire becomes unstable, and there is a problem that reliability for power transmission and transmission and reception is impaired.

The problem to be solved by the present invention is to connect a cable electric wire having a stranded wire formed by twisting a plurality of element wires as a core wire by a simple processing operation using a piercing terminal, and further, to connect the cable. Another object of the present invention is to provide a piercing terminal connection structure with high reliability in power transmission and communication by avoiding disconnection of each wire that constitutes an electric wire.

[0008]

In order to solve this problem, the piercing terminal connection structure according to the present invention has an insulating coating material for a core wire formed by twisting a plurality of strands as described in claim 1. A piercing terminal connection structure in which a cable electric wire coated with is conductively connected to a piercing terminal,
The piercing terminal is provided with a fitting portion for fitting and connecting a mating connector terminal on one end side and a connecting portion for conducting connection with the cable electric wire on the other end side, and the connecting portion The left and right side walls of the base portion to which the cable electric wire is abutted are provided in an expanded manner, and piercing blades are provided on the left and right side walls inward toward the cable electric wire on the base portion and substantially parallel to the cable electric wire. The piercing blade is pierced and inserted into the insulating coating material of the cable electric wire by closing the left and right side walls inward with the cable electric wire abutting on the base portion of the connecting portion, The gist is that the core wire is electrically connected.

According to this piercing terminal connection structure, the core wire of the cable electric wire and the piercing blade are electrically conductively connected by piercing and inserting the piercing blades provided on the left and right side walls of the connecting portion of the piercing terminal into the cable electric wire. Therefore, the piercing blade does not cut the wires forming the core wire to cause poor contact. Also, when the pierce blade is inserted into the cable wire introduced into the base part, an inward pressing force acts on the cable wire, and a high contact load is generated at the contact part between the pierce blade and the cable wire, so it is strong. A simple connection structure can be obtained.

Further, since the piercing blade is provided substantially parallel to the cable electric wire, it has a strong connection strength in the pulling-out direction of the cable electric wire and there is no fear of falling off from the terminal. Moreover, if the width of the piercing blade is wide enough, the contact area between the piercing blade and the core wire can be made large, so that not only the connection reliability between the piercing terminal and the cable wire is further improved, but also the conduction state is maintained. It can be better.

In this piercing terminal connection structure,
As described in claims 2 to 4, the pair of piercing blades are provided on the left and right side walls of the connecting portion so as to face each other, or the plurality of piercing blades may be provided alternately. If the piercing blades are provided so as to face each other, when the piercing blades are pierced and inserted into the cable electric wire, a contact load is evenly applied to the cable electric wire on the left and right sides, so that a stable connection state can be obtained. Further, if the plurality of piercing blades are provided facing each other 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.

Further, the piercing terminal used in this piercing terminal connection structure is such that when the piercing blades are pierced and inserted into the left and right sidewalls of the connecting portion into the cable wire as described in claim 5, the axis of the cable wire is substantially the same. It is desirable to be provided so as to be pierced in the core direction. When piercing a cable wire with a circular cross section, when trying to insert the piercing blade out of the axial direction of the cable wire, the tip of the piercing blade slips on the surface of the insulating coating material and sticks into the wire. It may not be possible. Therefore, in order to pierce the cable electric wire having such a shape with the piercing blade, it is desirable to insert the piercing blade in the axial direction, so that the piercing blade is pierced in the substantially axial direction of the cable electric wire as in the present invention. By providing the piercing blade, the work of inserting the piercing blade can be performed smoothly and reliably.

[0013]

BEST MODE FOR CARRYING OUT 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. 1 to 3. Piercing terminal 1 shown in FIG.
Reference numeral 0 denotes a heat-resistant copper alloy plate that is assembled and formed by punching. A fitting portion 11 for fitting and connecting a mating connector connection terminal (not shown) is provided on one end side and the other end side. A connecting portion 12 for electrically connecting the cable electric wire 20 is provided integrally with the fitting portion 11.

The connecting portion 12 is provided with a plurality of piercing blades 15a to 15f formed by cutting and raising the left and right side walls 14L and 14R of the base portion 13 inwardly and substantially in parallel with each other in parallel with the cable electric wire 20. Each of these piercing blades 15
In order to facilitate insertion of the puncture, a to 15f are formed in a tapered shape such that the edge portion becomes thinner toward the tip. When connecting the cable electric wire 20 to the connecting portion 12, as shown in FIG. 1, the left and right side walls 14L and 14R are arranged so that the cable electric wire 20 can be introduced onto the base portion 13 without being caught by the piercing blades 15a to 15f. Each is in an open state. Further, the piercing blades 15a to 15f are cut and raised so that the tip end portions thereof are oriented substantially in the axial direction of the cable electric wire 20 abutted on the base portion 13 (FIG. 3).
reference).

As shown in FIG. 1, the cable electric wire 20 which is conductively connected to the piercing terminal has core wires 21, 21 ... Which are composed of a plurality of annealed copper wires (stranded wires) twisted together. Are bundled together and the periphery thereof is covered with an insulating coating material 22 made of synthetic resin.

Next, the steps for connecting the cable electric wire 20 to the piercing terminal 10 in a conductive manner will be described with reference to FIGS.
Will be described step by step. First, the cable electric wire 20 is introduced from above into the connecting portion 12 of the piercing terminal in which the left and right side walls 14L and 14R of the base portion 13 are expanded (FIG. 3A), and the cable wire 20 is attached onto the base portion 13. Hit (Figure 2
And FIG. 3B).

Next, the left and right side walls 14L, 1 expanded outwardly
4R is closed inward, and the side walls 14L, 14R
The piercing blades 15a to 15f provided on the (in FIG. 3, the piercing blades provided on one side wall are referred to as “15a, 15c, 15
e ”, the piercing blade provided on the other side wall is“ 15b, 1
5d, 15f "are displayed respectively. ) Is pierced and inserted toward the inside of the cable electric wire 20, and is sandwiched between a plurality of core wires 21, 21 ... As shown in FIGS. can get.
3 (c) and 3 (d) are respectively A- in FIG.
It is a figure showing the section connection structure in the section A and the section BB.

The piercing blades 15a to 15f are cable electric wires 2.
When piercingly inserted into 0, a 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, the piercing blades 15a to 15f are shown in FIGS. 3 (c) and 3 (d).
As shown in FIG. 2, the lower end of the cable electric wire 20 is inserted into the cable electric wire 20 inwardly downward, so that the pierce blade 1
It is in a state of being pinched by 5a to 15f and the base end portion 13, and a high contact load is also generated at the contact portion between the lower end portion of the cable electric 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.

FIGS. 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 connecting structure according to this embodiment has a plurality of pairs of piercing blades 15L, 15R, 15L, 15R and 15L on the left and right sidewalls 14L, 14R of the connecting portion 12.
15Rs are provided facing each other. Similar to the piercing terminal according to the above-described embodiment, each piercing blade is formed in a tapered shape so that the edge portion becomes thinner toward the tip to facilitate insertion of the puncture. Furthermore, each piercing blade 15
L, 15R, 15L, 15R and 15L, 15R are
The cable electric wire 2 whose tip is abutted on the base 13.
It is cut and raised so as to be oriented in the direction of the substantially zero axis. Since the structure of the piercing terminal 10 on the side of the fitting portion 11 is the same as that of the first embodiment, the description thereof will be omitted.
In FIG. 4, only the connecting portion 12 is shown.

When connecting the cable electric wire 20 to the piercing terminal 10, as shown in FIG.
The cable wire 20 is introduced into the connection portion 12 in which 14R is in an expanded shape and is abutted on the base end portion 13 (FIG. 5).
(A)). Next, the left and right side walls 14L, 14R are closed and the side walls 14L, 14R are cut and raised to form pierce blades 15L, 15R, 15L, 15R and 15L, 1
5R is pierced and inserted from both left and right directions toward the axial center of the cable electric wire 20 (FIG. 5B). At this time piercing blade 1
5L, 15R, 15L, 15R and 15L, 15R are electrically connected to the core wires 21, 21 ... While being sandwiched between the plurality of core wires 21, 21.
(C)).

In this way, the pierce blades 15L, 15R, 15L, 1 provided facing the left and right side walls 14L, 14R.
When 5R, 15L, and 15R are pierced and inserted into the cable electric wire 20, the contact load generated at the contact portion between the cable electric wire 20 and the piercing blade is evenly applied to the left and right, so that a piercing terminal connection structure with higher connection reliability is obtained. To be

Further, the piercing blades 15L, 15R, 15
Since L, 15R and 15L, 15R are respectively inserted inward in the cable electric wire 20, the cable electric wire 2
The lower end of 0 is the piercing blade 15L, 15R, 15L, 15R
And 15L, 15R and the base end portion 13 are in a state of being sandwiched, 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. This allows
A stronger connection can be obtained.

In the piercing terminal 10 applied to the piercing terminal connecting structure according to the above two embodiments,
The piercing blades provided on the left and right side walls 14L and 14R of the connecting portion 12 were cut and raised so that the tips thereof were oriented substantially in the axial direction of the cable electric wire abutted on the base portion 13, but this is not always the case. It does not have to be cut and raised. Therefore, as shown in FIG. 6, the piercing blade 15a
˜15f or 15L, 15R, 15L, 15R and 15L, 15R are left and right side walls 14L, 14 of the base portion 13.
It may be cut and raised so as to be perpendicular to R.

FIG. 6 shows a process of connecting the cable electric wire to the piercing terminal 10 of the type in which the piercing blades 15L and 15R are provided facing the left and right side walls 14L and 14R. Specifically, the cable wire 20 is connected to the connecting portion 12
Introduced from above (Fig. 6 (a)), piercing blades 15L, 1
The right and left side walls 14L and 14R, which are widened, are closed inward at appropriate positions such that 5R can pierce the cable 20 (FIG. 6 (b)), and the piercing blade 15L,
15R is inserted into the cable electric wire 10 by puncturing. At this time, the piercing blades 15L and 15R inserted and inserted are sandwiched between the plurality of core wires 21, 21 ... And an electrical conduction state is obtained (FIG. 6C).

Also in this connection structure, the piercing blade 15
When the L and 15R are pierced and inserted, a pressing force acts on the cable wire 10 and a high contact load is generated at the contact portion, so that a piercing terminal connection structure having excellent connection reliability is provided. be able to.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the number and size of the piercing blades provided on the side wall of the base portion of the piercing terminal are not limited to those in the above-described embodiment, and can be appropriately changed according to the use environment and the like. Further, in the above embodiment, the piercing blade is provided so as to be pierced in the substantially axial direction of the cable electric wire, but the present invention is not limited to this, and can be appropriately changed according to the connection situation. Furthermore, in the above embodiment, the pierce blade is formed in a taper so that it becomes thinner as it goes toward the tip, but the sharpness at this time is the size of the cable wire to be pierced,
It is desirable to appropriately change it depending on the material of the insulating coating material, the number of core wires, and the like.

[0027]

According to the piercing terminal connection structure of the present invention, it is possible to perform conductor connection by a simple processing operation without stripping the insulation coating material at the terminal portion of the cable wire when connecting the cable wire to the piercing terminal. Of course, unlike the case of the conventional conductor connection by the pressure contact blade, the core wire constituting the cable electric wire is not cut by the pressure contact blade, and the reliability of the power transmission and the transmission / reception by the stable conductor connection is high.

Further, when connecting the cable electric wire to the piercing terminal, the side wall of the cable electric wire introduced at the base of the connecting portion is closed inward to pierce the piercing blade, and the piercing blade and the plurality of core wires are electrically connected. Since the piercing blade is provided in the longitudinal direction of the cable, there is no fear that the piercing blade will fall out of the cable electric wire, and a very stable connection state can be obtained.

[Brief description of 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 electric wire is introduced into the piercing terminal connection portion shown in FIG.

3A and 3B are cross-sectional views showing a process of connecting a cable electric wire to the piercing terminal connection portion shown in FIG. 1, where FIG. 3A is a view before introducing the cable electric wire, and FIG. A state diagram, (c) is a state diagram in which a piercing blade provided on one side wall is pierced and connected to a cable electric wire,
And (d) are diagrams showing a state in which a pierce blade provided on the side wall on the other side is pierced into a cable electric wire and connected.

FIG. 4 is an external perspective view of a connection portion of a piercing terminal applied to the piercing terminal connection structure according to the second embodiment of the present invention.

5A and 5B are cross-sectional views showing a process of connecting a cable electric wire to the piercing terminal connecting portion shown in FIG. 4, where FIG. 5A is a view before the cable electric wire is introduced, and FIG. A state diagram, (c) is a state diagram in which piercing blades provided on the left and right sidewalls are pierced into the cable electric wire and connected.

6 is a cross-sectional view showing a process of connecting a cable electric wire to a piercing terminal in which a piercing blade provided on a side wall of a connecting portion is vertical to the side wall as a modified example of the piercing terminal shown in FIG. (A) is a diagram before the cable electric wire is introduced, (b) is a state immediately before piercing the cable electric wire with the piercing blade, and (c) shows a state where the pierce blades provided on the left and right side walls are pierced and connected to the cable electric wire. It is a figure.

FIG. 7 is an external perspective view of a connection terminal provided with a conventional pressure contact blade, (a) is an external perspective view of the connection terminal, and (b) is a plan view from above the connection terminal.

8 is a cross-sectional view of a connection structure of a connection terminal and a cable wire provided with the press contact blade shown in FIG.

[Explanation of symbols]

10 Piercing terminal 12 Connection 13 Base 14L, 14R Side wall 15a-15f Piercing blade 20 cable wires 21, 21 ... Core wire 22 Insulation coating material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroomi Hiramitsu             1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi             Auto Network Technical Laboratory Co., Ltd. F-term (reference) 5E012 AA18 AA24 AA38

Claims (5)

[Claims] 1. A piercing terminal connection structure in which a core wire formed by twisting a plurality of strands together is electrically connected to a piercing terminal of a cable electric wire covered with an insulating coating material,
The piercing terminal is provided with a fitting portion for fitting and connecting a mating connector terminal on one end side and a connecting portion for conducting connection with the cable electric wire on the other end side, and the connecting portion The left and right side walls of the base portion to which the cable electric wire is abutted are provided in an expanded manner, and piercing blades are provided on the left and right side walls inward toward the cable electric wire on the base portion and substantially parallel to the cable electric wire. The piercing blade is pierced and inserted into the insulating coating material of the cable electric wire by closing the left and right side walls inward with the cable electric wire abutting on the base portion of the connecting portion, A piercing terminal connection structure, which is electrically connected to the core wire. 2. The piercing terminal connection structure according to claim 1, wherein the piercing terminal is provided with a pair of piercing blades facing each other on the left and right sidewalls of the connecting portion. 3. The piercing terminal connection structure according to claim 1, wherein the piercing terminal is provided with a plurality of pairs of piercing blades facing each other on the left and right sidewalls of the connecting portion. 4. The piercing terminal connection structure according to claim 1, wherein the piercing terminal has a plurality of piercing blades provided alternately on the left and right sidewalls of the connecting portion. 5. The piercing terminal is provided on the left and right side walls of the connecting portion so as to be pierced in a substantially axial direction of the cable electric wire when a piercing blade is pierced and inserted into the cable electric wire. The piercing terminal connection structure according to any one of claims 1 to 4.