JP2003123884A - Flat cable connection part, and connection method of flat cable and connection terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flat cable connection part capable of easily setting the width of a connection terminal plate corresponding to various kind of flat conductors having different width from each other. SOLUTION: A flat cable connection part 7 is formed by thrusting a plurality of protruded crimp pieces 6, arranged in the longitudinal direction at both sides in width direction of a terminal plate 5 of a connection terminal 4, into a flat conductor 1 of a flat cable which is formed by covering at least one piece of flat conductor 1 with a flat insulation coating, and by bending and caulking top end part of respective crimp pieces 6 thrust through the flat cable. The width of the terminal plate 5 to which, crimp pieces 6 are arranged at its both sides in width direction, is expressed by W>=Wc×(Fs/Fc), where, Wc is the width of the flat conductor, Fs is a tensile strength standard value of the flat conductor 1, Fc is a tensile strength of the flat conductor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cable connecting portion using a flat cable used for electric wiring of electric equipment and automobiles, and a method of connecting a flat cable and a connecting terminal.

[0002]

2. Description of the Related Art A conventional flat cable connecting portion composed of a flat cable and a connecting terminal is disclosed in Japanese Patent Laid-Open No. 04-3598.
No. 75 and Japanese Patent Laid-Open No. 04-363876, the flat conductor 1 as shown in FIGS.
Of the flat cable 3 coated with the flat insulating coating 2 is peeled off in advance at the portion where the flat insulating coating 2 is to be connected to expose the flat conductor 1, and the exposed portion of the flat conductor 1 extends from the terminal body of the connection terminal 4. In addition, the crimp pieces 6 projecting in the longitudinal direction on both sides in the width direction of the terminal plate 5 are crimped so as to embrace the flat conductor 1 to form the flat cable connecting portion 7,
As shown in (A) and (B), a plurality of crimp pieces 6 projecting in the longitudinal direction on both sides in the width direction of the terminal plate 5 extending from the terminal main body 8A of the connection terminal 4 are provided in the flat conductor 1.
Is pierced into the flat cable 3 only at the flat insulation coating 2 on the outer side in the width direction, and the tip end of each crimp piece 6 penetrating the flat cable 3 is bent into an arc shape and is crimped. A method of contacting the flat conductor 1 at the tip of the crimp piece 6 to form the flat cable connecting portion 7 has been adopted.

However, in recent years, the density of wiring has been increased and the size of connection terminals has been reduced. For example, the thickness is 0.15 to 0.2 m.
When a flat conductor 1 having a width of m and a width of about 1.5 to 3.0 mm is used, the conventional flat conductor 1 shown in FIGS.
It is difficult and troublesome to remove the flat insulating coating 2 in advance as shown in FIG.
As shown in Fig. 4, the crimp pieces 6 of the connection terminal 4 are crimped from the outside in the width direction of the flat conductor 1 so that the crimp pieces 6 are held by the crimp pieces 6, and the tip of each crimp piece 6 is brought into contact with the flat conductor 1. It has been found that a sufficient contact force cannot be obtained and the contact electric resistance between the connection terminal 4 and the flat conductor 1 remarkably increases in a long-term reliability evaluation test such as thermal shock.

Therefore, in recent years, in order to connect the small-sized connecting terminal 4 to the narrow flat conductor 1 having the width Wc as described above, the connecting terminal 4 is used as shown in FIGS. , The width W (<W
A cable having a structure in which a plurality of crimp pieces 7 are provided on both sides in the width direction of the terminal plate 5 in c) is used, and as shown in FIGS. The flat cable 3 is arranged on the receiving metal fitting 10 so that the flat conductor 1 exists on the bending molding concave portion 9, and in this state, the flat cable 3 is connected to the flat cable 3 so as to correspond to the flat conductor 1. The plurality of crimp pieces 6 are arranged downward, are guided by the guide member 11 and press the terminal plate 5 by the anvil 12, the plurality of crimp pieces 6 are pierced into the flat cable 3 and penetrated into the flat conductor 1, It is considered that the flat cable connection portion 7 is formed by bending and crimping the tip end portion of each crimp piece 6 penetrating through 3 as shown in FIG.
In this case, the flat conductor 1 is applied at the pressure contact portion P of FIG.
A strong contact load is applied between the crimp piece 6 and the crimp piece 6, and an electrical connection is made. The crimp pieces 6 may be arranged in a zigzag pattern on both sides of the terminal board 5 in the width direction. If the crimp pieces 6 are arranged in a staggered manner, the crimp pieces 6 on each side can be pierced into the flat conductor 1 relatively easily even if the width of the flat conductor 1 is narrowed. In this way, connect each crimping piece 6 to the flat cable 3 at the position of the flat conductor 1.
The connection terminal 4 that is pierced at is called a piercing terminal.

In FIG. 6B, when the terminal plate 5 is provided with the window 5a, the flat cable 3 is pushed when the tip of each crimp piece 6 is bent and caulked, and the inside of the window 5a is pushed. It shows a bent state.

[0006]

However, the method of piercing and connecting the crimp piece 6 of the small-sized connecting terminal 4 to the flat conductor 1 having a narrow width requires a very precise piercing technique, which is different from the conventional method. In the state where there is no grounded setting standard for the width W of the terminal plate 5 in which the crimp pieces 6 are juxtaposed on both sides in the width direction, the setting of the width W of the terminal plate 5 is inevitably narrow on the safe side. In the tensile test after connection, the standard tensile strength equivalent to the conventional round electric wire may not be obtained, so connection terminal 4 corresponding to flat conductor 1 of various widths
The setting of the standard for setting the width W of the terminal plate 5 is awaited.

An object of the present invention is to provide a flat cable connecting portion which can easily set the width W of the terminal plate of the connecting terminal corresponding to the flat conductors of various widths.

Another object of the present invention is to provide a method for connecting a flat cable and a connection terminal which can easily set the width W of the terminal plate of the connection terminal corresponding to flat conductors of various widths.

[0009]

SUMMARY OF THE INVENTION The present invention comprises at least one
With respect to the flat conductor of the flat cable in which the flat conductor of the strip is covered with the flat insulating coating, the crimp pieces protruding in the longitudinal direction on both sides in the width direction of the terminal plate of the connection terminal are the flat conductor. For the flat cable connection part, which is pierced through the flat insulation coating and is crimped by bending the tip of each crimp piece penetrating the flat cable.

In the flat cable connecting portion according to the present invention, the width W of the terminal plate in which the crimping pieces are juxtaposed on both sides in the width direction is Wc of the flat conductor and the standard value of the tensile strength of the flat conductor. When Fs and the tensile strength of the flat conductor are Fc, W ≧ Wc × (Fs / Fc).

Further, according to the present invention, a plurality of flat conductors of a flat cable in which at least one strip of flat conductor is covered with a flat insulating coating are provided on both sides in the width direction of the terminal plate of the connection terminal in the longitudinal direction. A crimp piece that has been crimped is pierced through the flat conductor through a flat insulating coating, and the tip of each crimp piece that penetrates the flat cable is bent and swaged to form a flat cable connection part. And

In the method of connecting the flat cable and the connection terminal according to the present invention, the width W of the terminal plate in which the crimp pieces are juxtaposed on both sides in the width direction is Wc of the flat conductor, and the tensile strength of the flat conductor. When the standard value of is Fs and the tensile strength Fc of the flat conductor is Fc, the connection is made so that W ≧ Wc × (Fs / Fc).

When the width W of the terminal plate of the connection terminal is determined as in the flat cable connecting portion and the connection method of the flat cable and the connection terminal, the width W of the terminal plate of the connection terminal corresponding to the flat conductor of various widths. Can be easily set. When the width W of the terminal plate of such a connection terminal is set,
It is possible to obtain a flat cable connecting portion that uses the conventional round electric wire and that satisfies the tensile strength standard of the connecting portion. Therefore, the obtained flat cable connecting portion satisfies the mechanical and electric characteristics required for the conventional connecting portion using the round electric wire.

[0014]

1 is a plan view showing an example of an embodiment of a flat cable connecting portion according to the present invention in which a flat insulating coating is omitted.

In the flat cable connecting portion 7 of this example, at least one flat conductor 1 is covered with a flat insulating coating (not shown in this example) 2 to form a flat cable 3.
A plurality of crimp pieces 6 projecting in the longitudinal direction on both sides of the terminal plate 5 of the connection terminal 4 in the longitudinal direction with respect to the flat conductor 1 of FIG.
Each of the crimp pieces 6 that is pierced through and penetrates the flat cable 3 is formed by bending and crimping the tip of each crimp piece 6.

In the flat cable connecting portion 7, the width W of the terminal plate 5 in which the crimp pieces 6 are juxtaposed on both sides in the width direction is the width Wc of the flat conductor 1 and the standard of the tensile strength of the flat conductor 1. When the value is Fs and the tensile strength of the flat conductor 1 is Fc, W ≧ Wc × (Fs / Fc) (1)

In this case, the standard value Fs of the tensile strength of the flat conductor 1 is predetermined by the material of the flat conductor 1.

The above formula (1) is derived from the following three reasons.

(A) Tensile strength Fc of the flat conductor 1
Is proportional to the width Wc of the flat conductor 1.

(B) The tensile strength Fc of the flat cable connecting portion 7 when the flat conductor 1 is connected with the width W of the terminal plate 5 in which the crimp pieces 6 are arranged in parallel on both sides in the width direction,
It was experimentally confirmed that the width is proportional to the width W of the terminal plate 5.

(C) The width W of the terminal plate 5 having the crimp pieces 6 projecting from both sides in the width direction is determined by the flat conductor 1 of the crimp pieces 6.
It is necessary to consider the puncture state against the and to widen it to the safety side with a margin.

Here, when the width of the flat conductor 1 when obtaining the standard value Fs is Ws, the following equations hold from (a) and (c).

Fs / Fc ≦ Ws / Wc (2) The width of the flat conductor 1 when obtaining Ws is the width of the terminal plate 5 having the width W.
It is the width W of the upper flat conductor 1. Therefore, the equation (2) becomes the equation (3).

Fs / Fc ≦ W / Wc (3) When this equation (3) is converted into an equation for obtaining the width W of the terminal board 5, the equation (1) is obtained.

When the width W of the terminal plate 5 is determined in this manner, the width W of the terminal plate 5 of the connection terminal 4 corresponding to the flat conductors 1 having various widths can be easily set. When the width W of the terminal plate 5 of the connection terminal 4 is set as described above, it is possible to obtain the flat cable connection portion 7 that satisfies the tensile strength standard of the connection portion using the conventional round electric wire. Therefore,
The obtained flat cable connecting portion 7 satisfies the mechanical characteristics and electrical characteristics required for a conventional connecting portion using a round electric wire.

On the other hand, the width Wc of the flat conductor 1 used for the small-sized connection terminal 4 is required to have the same current-carrying characteristics as that of the round electric wire generally used for conventional wiring. Although they have the same strip-shaped conductor cross-sectional area, in reality, since the conductor shape is flat, the cross-sectional area of approximately 75% of that of the conventional round wire conductor cross-sectional area, A flat conductor 1 having a conductor resistance of about 75% of that of a conventional round conductor is used. Therefore, for a conventional round wire with a conductor cross section of 0.5 sqmm,
A flat conductor 1 having a thickness of 0.15 mm and a width of 2.5 mm is used. Further, the tensile strength when the flat cable 3 having these dimensions and the connection terminal 4 are connected is set to the same standard as that of the connection portion of the conventional round electric wire. That is, it is 90 N or more for a conductor width of 2.5 mm and 70 N or more for a conductor width of 1.5 mm.

Therefore, the tensile strength for each conductor width has been measured and confirmed. Since the tensile strength is proportional to the conductor width, the crimp pieces 6 are arranged in parallel on the conductor corresponding to the tensile strength standard value, that is, on both sides in the width direction. The width W of the formed terminal plate 5 can be obtained by the equation (1).

For example, for a flat cable 3 having a thickness of 0.15 mm and a conductor width of 2.5 mm, the flat cable 3
Has a tensile strength of 160 N, so (90/160) x 2.5
The width W of the terminal board 5 of mm = 1.4 mm or more is required.

In the actual dimension setting of the width W of the terminal plate 5 in which the crimp pieces 6 are arranged in parallel on both sides in the width direction, the above-mentioned terminal board 5 is taken into consideration in consideration of the piercing state of the crimp piece 6 with respect to the flat conductor 1. The width of the terminal plate 5 which is wider on the safe side with a margin larger than the minimum width W is set as the minimum value. The upper limit of the width W of the terminal plate 5 is set so that the crimping piece 6 does not come off the flat conductor 1 to be stuck.

The main factors of the dimensional deviation occurring in this case are the piercing position deviation of the crimp pieces 6, the arrangement pitch of the terminal plates 5, and the width W of the terminal plates 5, which are shown in FIG.
When three flat conductors 1 are arranged in parallel in the flat cable 3 having the width Wo at a pitch of p1 between the first and second lines and a pitch of p2 between the second and third lines as shown in FIG. In the flat cable 3 there is a variation of k due to the displacement of the crimping piece 6 in the piercing position.
Even if the flat conductors 1 are displaced in pitch during manufacturing, that is, the flat conductors 1 are arranged in parallel under the condition that the pitch between the flat conductors 1 is p1 = p2, the central flat conductor 1 is displaced from the 4a position to the 4b position as a manufacturing variation. Therefore, the maximum width W of the terminal plate 5 is set in consideration of these two variations. As a specific example, since the dimensional deviations in the actual crimping step 6 of the crimping piece 6 and in the flat cable manufacturing step were ± 0.1 mm, the width of the flat conductor 1 on one side was 0.1 + 0.1 = 0.2 mm. Inside Wc, that is, when the width Wc of the flat conductor 1 is 2.5 mm
The width W of the terminal board 5 is set to 2.1 mm or less.

In FIG. 2, c1 is the center position in the width direction of the central flat conductor 1, and c2 is the center position in the width direction when the center flat conductor 1 is displaced.

[0032]

In the flat cable connecting portion according to the present invention, the width W of the terminal plate, in which the crimping pieces are juxtaposed on both sides in the width direction, is the width Wc of the flat conductor and the standard of the tensile strength of the flat conductor. When the value is Fs and the tensile strength of the flat conductor is Fc, W ≧ Wc × (Fs / Fc) is set. Therefore, set the width W of the terminal plate of the connection terminal corresponding to the flat conductor of various widths. It can be done easily. By setting the width W of the terminal plate of such a connection terminal, it is possible to obtain a flat cable connection portion that uses the conventional round electric wire and that satisfies the tensile strength standard of the connection portion. Therefore, the obtained flat cable connecting portion satisfies the mechanical and electric characteristics required for the conventional connecting portion using the round electric wire.

Further, in the method of connecting the flat cable and the connection terminal according to the present invention, the width W of the terminal plate in which the crimp pieces are arranged in parallel on both sides in the width direction is the width Wc of the flat conductor,
When the standard value of the tensile strength of the flat conductor is Fs and the tensile strength Fc of the flat conductor is Fc, the connection is made so that W ≧ Wc × (Fs / Fc). The width W of the terminal plate of the connection terminal can be easily set. By setting the width W of the terminal plate of such a connection terminal, it is possible to obtain a flat cable connection portion that uses the conventional round electric wire and that satisfies the tensile strength standard of the connection portion. Therefore, the obtained flat cable connection part has the mechanical characteristics required for the connection part using the conventional round electric wire,
The electrical characteristics will be satisfied.

[Brief description of drawings]

FIG. 1 is a plan view of an example of an embodiment of a flat cable connecting portion according to the present invention in which a flat insulating coating is omitted.

FIG. 2 is a plan view showing an example of a flat cable connecting portion in which a crimp piece of a connection terminal is pierced and connected to a flat conductor of a flat cable.

FIG. 3A is a vertical cross-sectional view showing an example of a conventional flat cable connection portion, showing a state in which a flat insulating coating is peeled off at the end of the flat cable to expose a flat conductor;
(B) is a front view showing a state in which a connection terminal is connected to the exposed flat conductor.

FIG. 4A is a vertical cross-sectional view showing a state in which a crimp piece of a connection terminal is pierced into a flat cable in another example of a conventional flat cable connection portion, and FIG. 4B is a perspective view of the flat cable connection portion in this example. It is a figure.

FIG. 5 is a perspective view showing an example of a connection terminal and a flat cable used in the present invention.

6A is a longitudinal sectional view showing a state in which the crimp piece of the connection terminal is pierced into the flat cable in the step of connecting the connection terminal and the flat cable shown in FIG. 5, and FIG. It is a longitudinal cross-sectional view showing a state in which the flat cable is pressed and fixed.

FIG. 7 is a perspective view showing an example of a flat cable connecting portion in the case of the present example.

[Explanation of symbols]

1 flat conductor 2 flat insulation coating 3 flat cable 4 connection terminals 5 terminal board 6 crimp pieces 7 Flat cable connection 8A, 8B terminal body 9 Bent forming recess 10 Cable bracket 11 Guide member 12 anvil

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazumasa Sakata             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. F-term (reference) 5E023 AA04 BB06 BB23 EE03 EE29                       GG06 HH18 HH28                 5E077 BB05 BB13 BB32 DD11 FF01                       FF09 JJ10

Claims (2)

[Claims] 1. A plurality of flat conductors, each of which has at least one flat conductor covered with a flat insulating coating, are provided on both sides of a terminal plate of a connection terminal in the width direction so as to project in the longitudinal direction with respect to the flat conductor. The crimp pieces are
In the flat cable connecting portion, the crimp pieces are pierced through the flat conductor through the flat insulating coating, and the tips of the crimp pieces that have penetrated through the flat cable are bent and crimped, and the crimp pieces are juxtaposed on both sides in the width direction. When the width W of the flat conductor is Wc, the standard value of the tensile strength of the flat conductor is Fs, and the tensile strength of the flat conductor is Fc, W ≧ Wc × ( Fs / Fc) flat cable connection. 2. A plurality of flat conductors, each of which has at least one flat conductor covered with a flat insulating coating, are provided so as to project in the longitudinal direction on both sides in the width direction of the terminal plate of the connection terminal. The crimp pieces
The flat conductor is pierced through the flat insulating coating, and the tip of each crimp piece penetrating the flat cable is bent and crimped to form a flat cable connection portion. When the width W of the terminal plate on which the crimp pieces are juxtaposed is Wc, the standard value of the tensile strength of the flat conductor is Fs, and the tensile strength of the flat conductor is Fc. , W ≧ Wc × (Fs / Fc), the connection method between the flat cable and the connection terminal.