JP2009245698A - Crimp terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crimp terminal capable of obtaining sure mechanical connectivity and electrical connectivity even if it is a thin-wired conductor part, and to provide a designing method thereof. <P>SOLUTION: The crimp terminal 1 has a wire barrel part 10 for crimping a conductor 102 of a covered electric wire 100. Seven element wires 102a having the tensile strength equal to or more than that of pure copper-made plate or of 600 MPa or more to constitute the wire barrel part 10 are bundled, and the crimp width W of the wire barrel part 10 for crimping the conductor 102 having a cross-sectional area S of 0.066 mm<SP>2</SP>set to the width that satisfies a mathematical expression (1): (wherein W: the crimp width; S: the cross-sectional area of the conductor part; n: the number of element wires; and t: the thickness of the wire barrel piece 12 before being crimped) so that the element wires 102a are stably crimped and arranged in an approximately two-staged shape in the crimping direction Z. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to, for example, a crimp terminal that is crimped to a conductor portion of a covered electric wire and attached to the tip of the covered electric wire.

Conventionally, as a terminal fitting to be attached to the tip of a covered electric wire, a crimp terminal provided with a crimping portion for crimping a conductor part with a sheath removed has been often used.
Specifically, the crimp terminal is composed of a terminal connection portion disposed on the distal end side in the longitudinal direction and a crimp portion disposed on the proximal end side in the longitudinal direction for crimping the conductor portion of the covered electric wire, and the crimp portion is It is comprised by the crimping | compression-bonding bottom surface which mounts the said conductor part, and the crimping piece called the wire barrel extended from the width direction both sides of this crimping | compression-bonding bottom face.

  The crimping terminal configured as described above can electrically and mechanically connect the terminal connecting portion and the conductor portion by crimping the conductor portion placed on the crimping bottom surface with a crimping piece.

  However, in such a connection between the crimp terminal and the conductor portion, if the crimping by the crimping piece is weak, the electrical resistance in the electrical connection with the conductor part increases, and conversely, if the crimping by the crimping piece is strong, The strength decreased, and there was a fear of breaking at a load below the strength required for use.

  Therefore, by interposing a crimping member, which is a separate member, between the crimping part and the conductor part, the contact area is expanded and the electric resistance is reduced without performing strong crimping that breaks the conductor part. A crimping method that can be used has been proposed (see Patent Document 1). By using this crimping method, both good electrical connection and mechanical connection can be achieved.

  However, thinning of electric wires has been attempted according to the recent reduction in weight and size of electronic devices, and when crimping the thinned conductor portion to the crimping terminal, interposing a crimping member made up of a separate member Was difficult.

Furthermore, in order to ensure strength, the thinned conductor portion often uses a strand having a high tensile strength by alloying or the like. For example, the conductor portion has a higher tensile strength than the member constituting the crimping portion. In such a case, it has been difficult to stably perform the crimping by the conventional crimping technique.
JP 2005-302475 A

  It is an object of the present invention to provide a crimp terminal and a design method thereof that can obtain reliable mechanical connectivity and electrical connectivity even with a thinned conductor portion.

The present invention is a crimp terminal comprising a crimping bottom surface on which a conductor portion of a covered electric wire is placed and a crimping piece extending from both sides of the crimping bottom surface in the width direction, and having a crimping portion for crimping the conductor portion. The crimping for crimping the conductor portion formed by bundling 3 to 9 strands having a tensile strength equal to or higher than the tensile strength of the member constituting the crimping portion or 600 MPa or more and having a cross-sectional area of 0.6 mm ² or less. The crimp width of the portion is characterized in that, in the crimped state, the wire is formed to have a stable crimping width in which the crimping piece has a substantially two-step stable crimping arrangement in the crimping direction in which the conductor portion is crimped.

  As an aspect of the present invention, the stable pressure bonding width is expressed by the following formula (1).

（ただし、Ｗ：クリンプ幅、Ｓ：導体部分の断面積、ｎ：素線の本数、ｔ：圧着前の圧着片厚）を満足する幅に設定することができる。

(W: crimp width, S: cross-sectional area of the conductor portion, n: number of strands, t: thickness of the crimped piece before crimping) can be set to satisfy the width.

  The covered electric wire includes a covered electric wire that covers a conductor portion made of a plurality of strands having high conductivity and high tensile strength, such as a copper alloy and an aluminum alloy, with an insulating covering.

  The said crimping | compression-bonding part is a wire barrel of the open barrel type | formula of a back view substantially U shape provided with the crimping | compression-bonding bottom face and the crimping piece called what is called a barrel piece arrange | positioned at the width direction both sides of a crimping | compression-bonding bottom face. including.

  The crimp terminal includes a connection terminal including the crimp part and a female connector BOX, a male connector BOX, or a terminal connection part such as a screw insertion hole, or a connection terminal constituted by only the crimp part. .

The crimp width refers to the length of the outer shape in the width direction of the crimped portion in a crimped state called so-called crimp wide, that is, the lateral width of the crimped bottom surface portion.
The member which comprises the said crimping | compression-bonding part contains that it is copper alloys, such as a pure copper or brass and a Corson type | system | group copper alloy.

  The crimping direction of the conductor portion by the crimping piece is a direction in which the crimping piece crimps the conductor portion to the crimping bottom surface by the crimper of the crimping applicator, and refers to a height direction substantially orthogonal to the width direction.

  The substantially two-step shape means a state in which a plurality of strands constituting the conductor portion are overlapped in two steps in the crimping direction. Specifically, although there are disturbances, many strands are two-step. Including being in a state.

As described above, in the crimp terminal including the crimping bottom surface on which the conductor portion of the covered electric wire is placed and the crimping pieces extending from both sides in the width direction of the crimping bottom surface and having the crimping portion for crimping the conductor portion, The crimping part for crimping the conductor part formed by bundling 3 to 9 strands whose strength is equal to or higher than the tensile strength of the member constituting the crimping part or 600 MPa or more and having a cross-sectional area of 0.6 mm ² or less. By forming the crimp width into a stable crimping width in which the wire is in a crimped state and the crimping piece is arranged in a stable crimping manner in a crimping direction in which the crimping part crimps the conductor portion, the coated wire is thinned. Thus, even a conductor portion formed by bundling a plurality of strands having high tensile strength can be connected in a stable crimped state.

  Specifically, inside the crimped part in the crimped state, the wire constituting the conductor part has a two-stage shape in the crimping direction, there is no gap between the crimped piece to be crimped and the crimped bottom, and the contact between the strand and the crimped part Crimping can be performed in a stable state with a large area. Therefore, it is possible to configure a connection state that can achieve both high mechanical connectivity and high electrical connectivity.

Note that it is more desirable to use a conductor portion having a cross-sectional area of 0.12 mm ² or less because a higher effect can be obtained. Furthermore, in the case of a conductor portion composed of 6 to 9 strands, flexibility is ensured as a thin conductor portion, which is more desirable.

  Further, by setting the stable crimping width to a width that satisfies the above formula (1), the clamp according to the cross-sectional area of the conductor part, the number of strands constituting the conductor part, and the thickness of the member constituting the crimping part The width can be set, and a uniform substantially two-stage stable pressure bonding state can be easily realized. Therefore, the connection terminal formed with the crimp width obtained by the above formula (1) can realize stable mechanical connectivity and electrical connectivity, and can improve connection reliability.

  According to the present invention, it is possible to obtain a crimp terminal and a design method thereof capable of obtaining reliable mechanical connectivity and electrical connectivity even with a thinned conductor portion.

An embodiment of the present invention will be described below with reference to the drawings.
1 shows an explanatory view of the crimp terminal 1 by a perspective view, FIG. 2 shows an explanatory view for explaining a method of crimping the wire barrel portion 10, and FIG. 3 is an explanatory view by a width direction sectional view of the wire barrel portion 10. FIG. 4 is an explanatory diagram showing a cross-sectional view in the width direction of the wire barrel portion 10 in an unstable crimped state.

  Crimp terminal having a wire barrel portion 10 that is composed of a barrel bottom portion 11 on which the conductor 102 of the covered electric wire 100 is placed and a wire barrel piece 12 extending from both sides of the barrel bottom portion 11 in the width direction Y. The crimp width W of one wire barrel portion 10 is a stable crimp width in which the wire 102a is in a substantially two-stage stable crimp arrangement in the crimping direction Z in which the conductor 102 is crimped by the wire barrel piece 12 in the crimped state. Forming.

  In addition, the stable crimping width which comprises the crimp width W of the wire barrel part 10 is the following numerical formula (1).

を満足する幅に設定されている。
なお、上記数式（１）において、Ｗはクリンプ幅を示し、Ｓは導体１０２の断面積を示し、ｎは素線１０２ａの本数を示し、ｔは圧着前のワイヤーバレル片１２の厚みを示している。

The width is set to satisfy.
In the above equation (1), W represents the crimp width, S represents the cross-sectional area of the conductor 102, n represents the number of the strands 102a, and t represents the thickness of the wire barrel piece 12 before crimping. Yes.

The conductor 102 has a tensile strength equal to or higher than the tensile strength of the Corson-based copper alloy plate material constituting the wire barrel portion 10, and is within a range of 3 to 9 1000 MPa strands 102 a that are 600 MPa or higher. this bundled, it is formed on 0.08 mm ² cross-sectional area S is 0.6 mm ² or less.

  The configuration of the crimp terminal 1 described above will be described in detail. The crimp terminal 1 includes a connector box 2 that allows insertion of a male connector (not shown) from the front to the rear in the longitudinal direction X, and the rear of the connector box 2. A wire barrel portion 10 disposed via a first transition 18 having a predetermined length, and an insulation barrel portion 15 disposed behind a wire barrel portion 10 via a second transition 19 having a predetermined length. Are integrally formed.

  The wire barrel portion 10 is configured by caulking and crimping the conductor 102 of the covered electric wire 100 with the wire barrel piece 12, and the insulation barrel portion 15 is configured by caulking and fixing the insulating coating 101 of the covered electric wire 100 with the insulation barrel piece 16. It is.

With the recent downsizing and weight reduction of electronic devices, the covered electric wire 100 is bundled with seven strands 102a that are thinner and higher in tensile strength than conventional stranded wires, and the cross-sectional area S is 0.08 mm ² . A conductor 102 is formed.
The wire 102a is a thin wire having a tensile strength of 1000 MPa that is equal to or higher than the tensile strength of the plate made of Corson copper alloy constituting the crimp terminal 1, and a diameter d of 0.12 mm.

  The crimp terminal 1 has a three-dimensional structure formed by bending a Corson copper alloy plate material having a tensile strength of 600 to 700 MPa and a plate thickness t of 0.15 to 0.25 mm. The connector box 2 is formed of an inverted hollow square column body, and includes a contact piece 2a that is bent backward in the longitudinal direction X and contacts a male connector to be inserted.

  As shown in FIG. 1B, the wire barrel portion 10 before crimping is composed of a barrel bottom portion 11 and wire barrel pieces 12 extending obliquely outward and upward from both sides in the width direction Y. It is formed in a U shape.

  Similarly, the insulation barrel portion 15 before crimping is also composed of a barrel bottom portion 17 and an insulation barrel piece 16 extending obliquely outward and upward from both sides in the width direction, and is formed in a substantially U shape in rear view. .

  In the state before crimping of the crimp terminal 1 configured as described above, the wire barrel portion 10 and the covered electric wire 100 are arranged as shown in FIG. 1B and crimped by the crimp applicator 200 shown in FIG. As shown in FIG. 1C, the conductor 102 can be crimped by the wire barrel portion 10 and the crimp terminal 1 can be attached to the covered electric wire 100.

  Specifically, the covered electric wire 100 is placed from above the crimp terminal 1 so that the conductor 102 of the covered electric wire 100 is inside the wire barrel portion 10 and the vicinity of the front end of the insulating coating 101 is inside the insulation barrel portion 15. (See FIG. 1B), set on the anvil 201 of the crimping applicator 200 shown in FIG. 2 (see FIG. 2A).

Then, as shown in FIG. 2 (b), the crimper 202 is lowered from above the wire barrel part 10, the wire barrel part 10 is sandwiched between the anvil 201 and the crimper 202, and as shown in FIG. The wire barrel piece 12 is curled.
Thereby, the conductor 102 is pressed against the barrel bottom 11 by the wire barrel piece 12, and a two-sided crimping state adjacent to the width direction Y can be configured (see FIG. 3).

The wire barrel portion 10 is set so that the crimp width W satisfies the above mathematical expression (1) in the crimped state.
Thereby, as shown in FIG. 3, the seven strands 102 a constituting the conductor 102 are formed in two steps in the crimping direction Z inside the wire barrel portion 10, and between the barrel bottom portion 11 and the wire barrel piece 12. Crimped in a stable state without gaps.

  Specifically, as the conductor 102 is thinned, a pure copper member constituting the wire barrel portion 10 is often used in order to ensure strength, such as by using alloying or the like to use the wire 102a having a high tensile strength as described above. The conductor 102 becomes harder than the conventional wire crimping technique, and it has been difficult to stably crimp the conductor 102. By setting the crimp width W to satisfy the above formula (1), the wire barrel Inside the part 10, the strands 102a are crimped by a stable crimping arrangement in which the strands 102a are arranged in two stages in the crimping direction Z.

By crimping with such a stable crimping arrangement arranged in two stages in the crimping direction Z, the crimping conditions are stabilized, and optimal mechanical connectivity and electrical connectivity can be obtained.
Conversely, when the crimp width W is set to be smaller than the range of the formula (1), as shown in FIG. 4A, the strands 102a are partially formed in a three-stage shape, resulting in an unstable crimped state.
Further, when the crimp width W is set to be larger than the range of the formula (1), as shown in FIG. 4 (b), the wire 102a becomes almost one stage in the wire barrel portion 10, and an unstable crimping state is brought about.

  Further, when the number of the strands 102a is set to be three steps, the aspect ratio (before crimping) of the conductor 102 in which the number of the strands 102a is in the range of 3 to 9 is vertically long, and the tips of the wire barrel pieces 12 are connected to each other. Prone to hitting. In this case, since the wire barrel piece 12 does not curl well and is difficult to bite down, the inner and outer side surfaces of the wire barrel piece 12 buckle, and the buckling wrinkle 12a enters and the strength cannot be maintained.

Furthermore, if the wire 102a is set to have one stage, only the crimping height can be managed at the time of mass production. Therefore, the allowable range of the crimping height at the time of crimping becomes narrow, and process management becomes difficult.
Thus, for the reasons described above, when the number of the strands 102a is three or one, the load at the time of crimping is not stable and it becomes difficult to manage the process, and it is difficult to ensure a stable crimped state.

  The first term on the left side of the above formula (1) showing the lower limit value of the crimp width W in which the strands 102a are arranged in a two-step stable crimping direction in the crimping direction Z is a bundle of n strands 102a and a conductor The width (n / 2 when the diameter of the strand 102a is d) is shown when n / 2 strands 102a are aligned when the total sectional area 102 becomes the sectional area S. The second term on the left side indicates the total thickness of the left and right wire barrel pieces 12.

  It should be noted that the right side of the above formula (1) showing the upper limit value of the crimp width W in which the wire 102a has a two-stage stable crimping arrangement is at least about 1.5 times the thickness of the wire barrel piece 12 by crimping. Therefore, the first term on the right side is set to 1.5 times the left side. Further, the second term on the right side shows the total thickness of the wire barrel piece 12 that increases due to the crimping.

  Thus, in the crimping state, by setting the wire barrel portion 10 so that the crimp width W satisfies the above formula (1), the strand 102a has a stable crimping arrangement in a two-step shape in the crimping direction Z. A stable crimped state can be configured. Therefore, it is possible to realize a connection state that ensures stable mechanical connectivity and electrical connectivity.

Next, a description will be given of a confirmation test for the above mathematical formula (1) that can realize such a connection state in which stable mechanical connectivity and electrical connectivity are ensured.
In this confirmation test, seven strands 102a having a diameter d of 0.12 mm are bundled to form a conductor 102 having a sectional area S of 0.08 mm ² , and the crimp width W and the thickness t of the wire barrel piece 12 are set as parameters. In the wire barrel portion 10, the crimping state when the conductor 102 is crimped is confirmed.

  In the following Table 1, which is the result of this confirmation test, “x” indicating the determination result indicates that the wire 102a is in an unstable crimping state in which the strands 102a are arranged in three stages or almost in a line in the crimping direction Z. “△” indicates that the strands 102a are arranged in two steps in the crimping direction Z, although there are some disturbances. “◯” indicates that the strands 102a are arranged in two steps in the crimping direction Z. Show.

  The “×” on the left side of the table indicates unstable crimping in which the strands 102a are arranged in a line, and the “x” on the right side in the table indicates unstable crimping in which the strands 102a are arranged in three stages in the crimping direction Z. It has become. Further, in this confirmation test, “◯” and “Δ” among the above determination results are determined to be stable crimped states.

上記表１からも、圧着する導体１０２及びワイヤーバレル片１２の板厚ｔに応じた適切なクリンプ幅Ｗの範囲が存在し、その範囲を超えたクリンプ幅Ｗの場合、素線１０２ａが不安定圧着状態となることが確認できた。
また、上記数式（１）は、上記表１中、“○”及び“△”で示される適切なクリンプ幅Ｗの範囲を算出することが確認できた。

Also from Table 1 above, there is an appropriate crimp width W range according to the thickness 102 of the conductor 102 and the wire barrel piece 12 to be crimped, and when the crimp width W exceeds the range, the strand 102a is unstable. It was confirmed that it was in a crimped state.
In addition, it was confirmed that the mathematical expression (1) calculated an appropriate crimp width W range indicated by “◯” and “Δ” in Table 1 above.

  Therefore, by setting the wire barrel portion 10 so that the crimp width W satisfies the above formula (1), the wire 102a is stably placed in the crimping direction Z in the two-stage stable crimping arrangement inside the wire barrel portion 10. Thus, it is possible to obtain the crimp terminal 1 that can realize crimping with both high mechanical connectivity and high electrical connectivity.

In this embodiment, the tensile strength is 1000 MPa which is equal to or higher than the tensile strength of the Corson-based copper alloy plate material constituting the crimp terminal 1, and the cross-sectional area S is a bundle of seven strands 102a having a diameter d of 0.12 mm. The conductor 102 having a thickness of 0.08 mm ² is formed, but the conductor 102 may be configured such that 3 to 9 strands 102 a are bundled and the cross-sectional area S is 0.6 mm ² or less. When S is 0.12 mm ² or less, the above effect is further enhanced.

Further, when the number of the strands 102a constituting the conductor 102 is 6 to 9, including the seven, the flexibility can be secured as the small-diameter conductor portion, which is more desirable.
Further, a plurality of serrations in the width direction formed in the width direction groove shape on the barrel bottom 11 may be arranged at predetermined intervals in the longitudinal direction.

In correspondence between the configuration of the present invention and the above-described embodiment,
The conductor portion of the present invention corresponds to the conductor 102,
Similarly,
The crimping bottom surface corresponds to the barrel bottom 11,
The crimping piece corresponds to the wire barrel piece 12,
The crimping part corresponds to the wire barrel part 10,
The strand corresponds to the strand 102a,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

Explanatory drawing by the perspective view of a crimp terminal. Explanatory drawing explaining the crimping | compression-bonding method of a wire barrel part. Explanatory drawing by the width direction sectional drawing of a wire barrel part. Explanatory drawing by width direction sectional drawing of the wire barrel part of an unstable crimping | compression-bonding state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Crimp terminal 10 ... Wire barrel part 11 ... Barrel bottom part 12 ... Wire barrel piece 100 ... Covered electric wire 102 ... Conductor 102a ... Wire S ... Cross-sectional area W ... Crimp width Y ... Width direction Z ... Crimp direction

Claims (2)

A crimping terminal comprising a crimping bottom surface for placing the conductor portion of the covered electric wire and a crimping piece extending from both sides in the width direction of the crimping bottom surface, and having a crimping portion for crimping the conductor portion,
The crimping part for crimping the conductor portion formed by bundling 3 to 9 strands having a tensile strength equal to or higher than the tensile strength of the member constituting the crimping part or 600 MPa or more and having a cross-sectional area of 0.6 mm ² or less. The crimp width of the
In the crimped state, the crimping terminal is formed with a stable crimping width in which the element wire has a stable crimping arrangement of approximately two steps in the crimping direction in which the crimping piece crimps the conductor portion. The stable crimp width is expressed by the following formula (1).

(W: crimp width, S: conductor cross-sectional area, n: number of strands, t: crimped piece thickness before crimping)
The crimp terminal according to claim 1, wherein the width is set to a width satisfying.

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