WO2020100875A1

WO2020100875A1 - Electric wire with terminal

Info

Publication number: WO2020100875A1
Application number: PCT/JP2019/044291
Authority: WO
Inventors: 静之小野; 卓也山下; 野村　秀樹; 亮史宮本; 隼釣井
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2018-11-13
Filing date: 2019-11-12
Publication date: 2020-05-22
Also published as: JP2020080258A

Abstract

This electric wire with terminal 10 is provided with an electric wire 11 having a conductor part 12, and a terminal 20 electrically connected to the electric wire 11. The terminal 20 comprises a bottom plate 23 where the electric wire 11 is placed, a first barrel piece 27 which extends from the bottom plate 23 and which is wound on the outer periphery of the electric wire 11, and a second barrel piece 28 which extends from the bottom plate 23 longer than the first barrel piece 27 and which is wound around the first barrel piece 27 and the outer periphery of the electric wire 11. The conductor compression ratio P(PA, PB), defined by the cross-sectional area S1 of a conductor part 12 before the electric wire 11 is crimped by the first barrel piece 27 and the second barrel piece 28 and the cross-sectional area S2 of the conductor part 12 after the electric wire 11 has been crimped by the first barrel piece 27 and the second barrel piece 28 is a conductor compression ratio P[%] = (cross-sectional area S2/cross-sectional area S1)×100, and of the conductor compression ratios P, the conductor compression ratio PA at which the contact area between the first barrel piece 27 and the second barrel piece 28 is maximum after the electric wire 11 has been crimped by the first barrel piece 27 and the second barrel piece 28, and the conductor compression ratio PB at which the contact area of the first barrel piece 27 and the conductor part 12 is maximum after the electric wire 11 has been crimped by the first barrel piece 27 and the second barrel piece 28, satisfy the expression PA < PB.

Description

Wire with terminal

In this specification, a technology related to an electric wire with a terminal is disclosed.

Conventionally, a technique is known in which the exposed conductor at the end of the wire is crimped by the barrel of the terminal. Patent Document 1 describes a terminal crimping structure including an aluminum electric wire composed of a large number of twisted wires and a covering portion for covering the twisted wires, and a wire barrel terminal having a U-shaped cross section for crimping the aluminum electric wire. There is. During crimping, the terminal fixed on the base is bent by the crimping jig to bend the wire barrel along the crimping groove of the crimping jig. It deforms in the direction of the central axis of the conductor part. Then, the tip portion of the wire barrel is pushed between the stranded wires of the conductor portion of the aluminum electric wire to be crimped.

Japanese Patent No. 4809591

By the way, as described above, in the structure in which the tip portion of the wire barrel is pressed between the stranded wires of the conductor portion of the aluminum electric wire and crimped, the strands of the stranded wire are exposed and exposed between the tip portions of the wire barrel. It is easy to be in a state, and there is a fear of corrosion due to the adherence of salt water or the like between the exposed different wires of the wires and the terminals. On the other hand, unlike the above configuration, when the wire barrel is deformed into an overlapping shape at the time of crimping so that one end of the U-shaped wire barrel overlaps the other end, the twisted wire is formed. Since the wire is covered with the overlapping wire barrel and the strands are not exposed to the outside, the problem of corrosion is less likely to occur. However, when the wire barrel is deformed into the overlap shape, there is a concern that corrosion may occur between the wire and the terminal due to the infiltration of water from the gap between the tip portions of the wire barrel overlapping the overlap shape.

The technique described in this specification has been completed based on the above circumstances, and suppresses the intrusion of water from between the portions where the first barrel piece and the second barrel piece overlap. With the goal.

The electric wire with a terminal described in the present specification includes an electric wire having a conductor portion, and a terminal electrically connected to the electric wire, wherein the terminal is a bottom plate portion on which the electric wire is placed, and A first barrel piece extending from the bottom plate portion and wound around the outer circumference of the electric wire; a second barrel piece extending from the bottom plate portion longer than the first barrel piece and wound around the outer circumference of the electric wire and the first barrel piece; And a cross-sectional area S1 of the conductor portion before the electric wire is crimped by the first barrel piece and the second barrel piece, and the electric wire is crimped by the first barrel piece and the second barrel piece. The conductor compression rate P defined by the cross-sectional area S2 of the conductor portion after the compression is P (%) = (cross-sectional area S2 / cross-sectional area S1) × 100, and the conductor compression rate P Among them, the conductor compression rate PA that maximizes the contact area between the first barrel piece and the second barrel piece after the electric wire is crimped by the first barrel piece and the second barrel piece, and the electric wire. The conductor compression rate PB at which the contact area between the first barrel piece and the conductor portion after being crimped by the first barrel piece and the second barrel piece is the largest satisfies the expression PA <PB.

According to the above configuration, regarding the contact area between the first barrel piece and the second barrel piece, the conductor compression rate PA is set to a high compression and the maximum area value is obtained, whereby the second barrel piece is made into a mold (anvil or crimper). ), It is possible to prevent the second barrel piece from rising, so that it is possible to effectively suppress the intrusion of water from between the first barrel piece and the second barrel piece. On the other hand, regarding the contact area between the electric wire and the first barrel piece, the conductor compression rate PB is set to a medium compression larger than the conductor compression rate PA to prevent disconnection at the time of high compression and disconnection of the wire at the time of low compression. it can. Therefore, an electric wire with a terminal having high connection reliability can be obtained. Moreover, such a terminal can be a terminal having high corrosion resistance and high connection reliability.

The following aspects are preferable as the embodiments of the technology described in the present specification.
The conductor compressibility PA is in the range of 20% to 40%.
With this configuration, the conductor compression rate PA is in the range of 20% to 40%, so that the mutual contact load between the overlapped first barrel piece and the second barrel piece is relatively high. Can be maintained at. With this, it is possible to suppress the intrusion of water from between the portions where the first barrel piece and the second barrel piece overlap each other, and therefore the conductor due to the infiltration of water from the portions where the first barrel piece and the second barrel piece overlap. Corrosion between the portion and the terminal can be suppressed. Further, when the conductor compression ratio PA is in the range of 20% to 40%, disconnection of the conductor portion is relatively suppressed, and the fixing force between the conductor portion and the terminal becomes high, so that the conductor portion and the terminal are It is possible to suppress a decrease in connection reliability.

The conductor compression rate PB is in the range of 40% to 70%.
With this configuration, the contact area between the first barrel piece and the second barrel piece can be increased, so that the intrusion of water from between the first barrel piece and the second barrel piece can be suppressed. You can

The bottom plate portion is formed with a protrusion protruding toward the conductor portion.

According to the technique described in this specification, it is possible to suppress the intrusion of water from between the portions where the first barrel piece and the second barrel piece overlap.

The side view which shows the electric wire with a terminal of embodiment. Bottom view showing an electric wire with terminals A perspective view showing a step of placing an electric wire on a terminal. The top view which shows the terminal of the expansion shape connected to the other terminal. A perspective view showing a state in which an electric wire is placed on a terminal Diagram for explaining the process of crimping with the electric wire placed on the terminal Sectional drawing which shows the state where the electric wire was crimped to the terminal on the anvil. The figure which shows the relationship between the conductor compressibility and the contact load between the conductor and the terminal. The figure which shows the relationship between the conductor compressibility and the contact area between the conductor and the terminal. The figure which shows the relationship between a conductor compression rate and the contact load between a 1st barrel piece and a 2nd barrel piece. The figure which shows the relationship between a conductor compression rate and the contact area between a 1st barrel piece and a 2nd barrel piece. AA cross section of FIG. 1 when the conductor compressibility is P1 AA cross section when conductor compressibility is P2 AA cross section when the conductor compressibility is P3 AA cross section when the conductor compressibility is P4 AA cross section when conductor compressibility is P5 AA cross section when conductor compressibility is P6 AA cross section when conductor compressibility is P7 AA cross section when conductor compressibility is P8 AA cross section when conductor compressibility is P9 BB cross section of FIG. 1 when the conductor compressibility is P1 BB cross section when conductor compressibility is P2 BB cross section when conductor compressibility is P3 BB cross section when conductor compressibility is P4 BB cross section when conductor compressibility is P5 BB cross section when conductor compressibility is P6 BB cross section when conductor compressibility is P7 BB cross section when conductor compressibility is P8 BB cross section when conductor compressibility is P9 A sectional view taken along line AA after springback when the conductor compressibility of another embodiment is P4.

This embodiment will be described with reference to FIGS. 1 to 15C.
The electric wire 10 with a terminal of this embodiment can be routed to a vehicle such as an automobile and connected to a device of the vehicle. In the following description, the X direction in FIG. 2 is the front, the Y direction is the left, and the Z direction in FIG. 1 is the upper direction.

The electric wire 10 with a terminal has an electric wire 11 and a terminal 20 to which the electric wire 11 is crimped, as shown in FIGS. As illustrated in FIG. 3, the electric wire 11 includes a conductor portion 12 and an insulating coating 13 that covers the periphery of the conductor portion 12. The conductor portion 12 is a twisted wire formed by twisting a plurality of metal element wires 12A made of, for example, aluminum or aluminum alloy. The insulating coating 13 is made of an insulating synthetic resin, and the insulating coating 13 is removed and the conductor portion 12 is exposed at the end portion of the electric wire 11.

The terminal 20 is made of, for example, a metal such as copper or a copper alloy, is connected to the terminal connecting portion 21, the rear of the terminal connecting portion 21, and the bottom plate portion 23 on which the conductor portion 12 of the electric wire 11 is placed, and the bottom plate portion 23. And a pair of

barrel pieces

27, 28 that stand up from both side edge portions of the. The terminal connecting portion 21 is provided with an elastically deformable elastic contact piece 21A inside a square tubular portion. The elastic contact piece 21A elastically contacts the mating male terminal (not shown) that has entered the rectangular tube portion, so that the terminal 20 and the male terminal are electrically connected.

The bottom plate portion 23 is U-shaped, extends rearward of the terminal connection portion 21, and the terminal portion of the electric wire 11 is placed inside. In the bottom plate portion 23, a convex portion 24 (see FIG. 4) extending in the front-rear direction is formed on the upper surface side, and a concave portion 25 is formed on the back surface side of the convex portion 24 on the lower surface side. The convex portion 24 can be formed, for example, at the time of molding the terminal by a pressing machine. Note that, in FIG. 4, a plurality of terminals are connected to a belt-shaped carrier 40 side by side at equal intervals, and a connecting portion 41 between the terminal 20 and the carrier 40 is cut before or after processing by a pressing machine. It is supposed to be done.

The pair of

barrel pieces

27, 28 is an open barrel type, and as shown in FIG. 3, the first barrel piece 27 extending upward from one side edge portion (right side) of the bottom plate portion 23 and the bottom plate portion. The second barrel piece 28 extending upward from the other side edge portion (left side) of 23. The length of the second barrel piece 28 in the extending direction is longer than that of the first barrel piece 27 (see FIG. 6). The tip ends of the

barrel pieces

27, 28 are tapered so that the outer surface side is notched in an inclined shape. When the pair of

barrel pieces

27, 28 are pressure-bonded, the

barrel pieces

27, 28 are deformed so as to wind around the conductor portion 12. Then, in the state where the conductor portion 12 is crimped by the pair of

barrel pieces

27, 28, as shown in FIG. 7, the overlapping portion 28A of the second barrel piece 28 is placed on the overlapped portion 27A of the first barrel piece 27. The pair of

barrel pieces

27 and 28 are overlapped with each other to overlap each other. In this state, the conductor portion 12 is in a state of being surrounded by the bottom plate portion 23 and the

barrel pieces

27 and 28, and the tip 28B of the second barrel piece 28 is brought into close contact with the outer surface of the first barrel piece 27 on the base end side. It comes into contact.

The terminal 20 can be formed by subjecting a metal plate material to punching and bending with a pressing machine. Although the terminal 20 is plated with tin, nickel or the like, it may be configured not to be plated.

A method of manufacturing the electric wire with terminal 10 will be described.
As shown in FIG. 6,

molds

30 and 34 are prepared for the crimping process, and the anvil 30 as the lower mold has a projection 32 formed on a concave mounting surface 31. A concave surface 35 is formed on the crimper 34 as the upper mold so that the

barrel pieces

27 and 28 are slidably contacted with each other to deform the

barrel pieces

27 and 28. When the terminal 20 is mounted on the mounting surface 31 of the anvil 30, the protrusion 32 of the mounting surface 31 is inserted into the recess 25 of the terminal 20 to position the terminal 20. Next, the terminal portion of the electric wire 11 is placed on the bottom plate portion 23 (see FIGS. 3 and 5). Next, when the crimper 34 disposed above the anvil 30 and the terminal 20 is lowered, the pair of

barrel pieces

27 and 28 that are in contact with the concave surface 35 of the crimper 34 are bent, and as shown in FIG. The barrel piece 27 is deformed so as to be wound around the outer periphery of the conductor portion 12, and the second barrel piece 28 is deformed so as to be wound outside the tip end portion of the first barrel piece 27, so that the tip end 28A of the second barrel piece 28 is deformed. Is in a state of being overlapped with the base end side of the first barrel piece 27 (the end of the overlapped portion 27A). The shape in which the

barrel pieces

27, 28 are deformed (and the cross-sectional shape of the conductor portion 12) depends on the lowered position (crimp height) of the crimper 34, and the lower the lower end of the crimper 34, the higher the compression of the conductor portion 12 becomes. (The conductor compressibility P is low), and the conductor portion 12 on the bottom plate portion 23 is crushed together with the pair of

barrel pieces

27 and 28.

<Experimental example>
An experimental example of this embodiment will be described below. In the experimental example, the electric wire with a terminal 10 includes a terminal 20 formed by pressing a metal plate material (a thickness of 0.25 mm in the present experimental example) made of a copper alloy, and a conductor portion 12 made of an aluminum alloy (in the present experimental example, And an electric wire 11 having a cross-sectional area of 0.75 mm ² . Then, the relationship between the conductor compressibility P and the contact load of the electric wire with terminal 10 and the relationship between the conductor compressibility P and the contact area were simulated using CAE (computer aided engineering). In this simulation, when the height of the crimper 34 is changed, a plurality of conductor compression rates P (P1 to P9) are obtained at different positions (the AA cross section and the BB cross section in FIG. 1) of the terminal-attached electric wire 10. The cross-sectional images (FIGS. 10A to 15C) of the electric wire with terminal 10 in FIG.

The contact load [N] of FIG. 8A indicates the load on the contact surface between the conductor portion 12 (the outer peripheral surface 12B of the conductor portion 12 of FIG. 7) and the terminal 20 (the inner surface 20A of the terminal 20 of FIG. 7). The contact load [N] of 9A is the overlapping portion 27A of the first barrel piece 27 (the outer surface 27AB of the overlapping portion of FIG. 7) and the overlapping portion 28A of the second barrel piece 28 (the inner surface 28AB of the overlapping portion of FIG. 7). The load on the contact surface between and is shown. The contact area [mm ² ] of FIG. 8B indicates the contact area between the conductor portion 12 (the outer peripheral surface 12B of the conductor portion 12 of FIG. 7) and the terminal 20 (the inner surface 20A of the terminal 20 of FIG. 7), The contact area [mm ² ] of FIG. 9B is obtained by comparing the overlapped portion 27A of the first barrel piece 27 ((the outer surface 27AB of the overlapped portion of FIG. 7) and the second barrel piece 28 (the inner surface 28AB of the overlap portion of FIG. 7). 8A to 9B, the conductor compression rate P is P1 = 18.6 [%], P2 = 26.9 [%], P3 = 39.4. [%], P4 = 51.2 [%], P5 = 63.7 [%], P6 = 75.6 [%], P7 = 86.1 [%], P8 = 94.3 [%], P9 = 98.5 [%].

FIGS. 10 (A) to 12 (C) show AA cross sections (cross sections in the YZ plane) of FIG. 1 at respective conductor compression rates P (P1 to P9), and FIGS. 13 (A) to 15 (C). ) Shows the BB cross section of FIG. 1 at each conductor compression rate P (P1 to P9).
Here, the conductor compression rate P is a value defined by the following equation (1).
Conductor compression ratio P = {(cross-sectional area S2 of conductor portion 12 after crimping) / (cross-sectional area S1 of conductor portion 12 before crimping)} × 100 (%) (1)
The cross-sectional areas S1 and S2 are cross-sectional areas of the YZ plane (direction orthogonal to the extending direction of the conductor portion 12) of the conductor portion 12 in the state of being crimped by the

barrel pieces

27 and 28.

As shown in FIG. 8A, the relationship between the conductor compression rate P and the contact load is that when the conductor compression rate P decreases from 100% (non-compression state) (high compression), the conductor portion 12 When the contact load between the terminal and the terminal 20 becomes higher (P9 → P6) and the contact load becomes almost constant (P6 → P4), the conductor compression rate becomes 50% to 40%. The contact load between the conductor portion 12 and the terminal 20 is slightly reduced, and the conductor compression rate is 40% or less, which is a substantially constant state (P3 → P1). On the other hand, the relationship between the conductor compression rate P and the contact area is as shown in FIG. The contact area between the conductors 12 and the terminals 20 becomes smaller (P4 → P1) when the conductor compressibility becomes approximately 50% or less (P4 → P1). .

Further, as shown in FIG. 9A, when the conductor compression rate P decreases from 100% (higher compression), the overlapping portion 27A of the first barrel piece 27 and the overlapping portion of the second barrel piece 28 overlap. The value of the contact load with 28A gradually increases until the conductor compression rate P is 20% or less (P9 → P1). On the other hand, as shown in FIG. 9B, the relationship between the conductor compression rate P and the contact area is such that when the conductor compression rate P decreases from 100% (higher compression), the cover of the first barrel piece 27 is reduced. The value of the contact area between the overlapping portion 27A and the overlapping portion 28A of the second barrel piece 28 is gradually increased (P9 → P3), and the contact area is in the range of the conductor compression rate P of 20 to 40%. It becomes almost constant (P3 → P1).

According to the results of the above simulation, when the conductor compression rate P is in the range of 40% to 75%, the contact load and the contact area between the conductor portion 12 and the terminal 20 are high (FIGS. 8A and 8B). It was found that when the conductor compressibility P was 50% to 60%, the values of the contact load and the contact area were higher. Further, since the contact load and the contact area between the conductor portion 12 and the terminal 20 are high, the oxide film on the surface of the conductor portion 12 can be destroyed and the electrical resistance can be reduced to ensure good electrical performance. it can. On the other hand, when the conductor compressibility P is higher than 75%, the contact load and the contact area are reduced as compared with the case where the conductor compressibility P is 40% to 75%. It was found that the sticking strength of the was weakened. When the conductor compressibility P is smaller than 40%, the value of the contact load is slightly reduced, and the contact load between the conductor portion 12 and the terminal 20 is smaller than that when the conductor compressibility P is 40% to 75%. It was found that the fixing strength became weak. When the conductor compressibility P is less than 40%, the contact load is slightly reduced because the conductor portion 12 is overstressed and the electric wire 11 is crushed, so that the conductor portion 12 is located before and after the pair of

barrel pieces

27 and 28. It is considered that the cause is that the metal element wire 12 </ b> A is broken or broken.

When the conductor compression rate P is in the range of 20% to 40%, the contact load and the contact area between the overlapped portion 27A of the first barrel piece 27 and the overlapped portion 28A of the second barrel piece 28 increase. (FIGS. 9A and 9B), the overlapped portion 27A and the overlapped portion 28A easily adhere to each other, and the infiltration of water from between the overlapped portion 27A and the tip 28B of the overlapped portion 28A (boundary) is suppressed. You can

According to this embodiment, the following actions and effects are exhibited.
The electric wire 10 with a terminal includes an electric wire 11 having a conductor portion 12 and a terminal 20 electrically connected to the electric wire 11. The terminal 20 includes a bottom plate portion 23 on which the electric wire 11 is placed and a bottom plate portion 23. A first barrel piece 27 wound around the outer circumference of the electric wire 11 and a second barrel piece 28 extended from the bottom plate portion 23 longer than the first barrel piece 27 and wound around the outer circumference of the electric wire 11 and the first barrel piece 27. And the electric wire 11 is crimped by the first barrel piece 27 and the second barrel piece 28, and the electric wire 11 is crimped by the first barrel piece 27 and the second barrel piece 28. The conductor compression rate P (PA, PB) defined by the cross-sectional area S2 of the conductor portion 12 after the compression is P (%) = (cross-sectional area S2 / cross-sectional area S1) × 100. , The conductor compression rate PA that maximizes the contact area between the first barrel piece 27 and the second barrel piece 28 after the wire 11 is crimped by the first barrel piece 27 and the second barrel piece 28, and the wire 11 is The conductor compression rate PB that maximizes the contact area between the first barrel piece 27 and the conductor portion 12 after being crimped by the first barrel piece 27 and the second barrel piece 28 satisfies the expression PA <PB.
According to the above-described embodiment, regarding the contact area between the first barrel piece 27 and the second barrel piece 28, the conductor compression rate PA is set to high compression (for example, P2 in FIG. 9B) to obtain the maximum area value. Since the second barrel piece 28 can be prevented from rising by hitting the mold (anvil 30 or crimper 34) with the second barrel piece 28, the invasion of water from between the first barrel piece 27 and the second barrel piece 28 can be prevented. Can be effectively suppressed. On the other hand, regarding the contact area between the electric wire 11 and the first barrel piece 27, the conductor compression rate PB is set to medium compression (for example, P4 in FIG. 8B) larger than the conductor compression rate PA, whereby disconnection at high compression and It is possible to prevent the electric wire 11 from coming off during low compression. Therefore, the electric wire with a terminal 10 having high connection reliability can be obtained. Further, such a terminal 20 can be a terminal 20 having high anticorrosion performance and connection reliability. Therefore, it is possible to suppress the intrusion of water from between the portions where the first barrel piece 27 and the second barrel piece 28 overlap, while suppressing the decrease in the connection reliability between the electric wire 11 and the terminal 20.

The conductor compression rate PA is in the range of 20% to 40%, preferably in the range of 20% to 35%, and more preferably in the range of 20% to 30%.
With this configuration, the contact load between the pair of

barrel pieces

27, 28 can be maintained at a relatively high numerical value even when the pair of

barrel pieces

27, 28 overlap each other. This can prevent water from entering between the overlapped portion 27A of the pair of

barrel pieces

27 and 28 and the tip 28B of the overlapped portion 28A (boundary), so that corrosion between the conductor portion 12 and the terminal 20 can be prevented. Can be suppressed.

The conductor compression rate PB is in the range of 40% to 70%, preferably in the range of 45% to 70%, and more preferably in the range of 50% to 70%.
With this configuration, the contact area between the conductor portion 12 and the terminal 20 and the contact load can be increased, while the contact area between the first barrel piece 27 and the second barrel piece 28 can be made relatively large. Therefore, it is possible to suppress the intrusion of water from the boundary (boundary) between the overlapped portion 27A of the pair of

barrel pieces

27 and 28 and the tip 28B of the overlapping portion 28A.

Further, the bottom plate portion 23 is formed with a convex portion 24 that is bent so as to project toward the conductor portion 12 side.
With this configuration, the protrusion 24 of the bottom plate portion 23 bites into the conductor portion 12 to increase the fixing force between the conductor portion 12 and the terminal 20, and at the same time, to cover the pair of

barrel pieces

27, 28. The contact load between the overlapping portion 27A and the tip 28B of the overlapping portion 28A can be increased.

<Other Embodiments>
The technology disclosed in this specification is not limited to the embodiments described by the above description and the drawings, and includes various aspects such as the following.
(1) Although the terminal 20 is a female terminal, it is not limited to this and may be used as a male terminal, a splice terminal, or the like.

(2) A pair of holding barrels may be provided behind the pair of

barrel pieces

27, 28 to hold the electric wire 11 around the insulating coating 13 of the electric wire 11.

(3) In the above embodiment, the conductor portion 12 is made of aluminum or aluminum alloy, but the conductor portion 12 is not limited to this, and may be copper, copper alloy, or a metal other than these. Further, although the conductor portion 12 is a stranded wire, the conductor portion 12 is not limited to this, and for example, a single core wire made of one metal may be used.
(4) Although the terminal 20 is made of copper or copper alloy, it is not limited to this, and may be made of metal such as aluminum, aluminum alloy, iron or iron alloy.

(5) Although the convex portion 24 and the concave portion 25 are provided on the bottom plate portion 23, the convex portion 24 and the concave portion 25 may not be provided on the bottom plate portion 23.
(6) As shown in FIG. 16, due to the elastic restoration (springback) of the second barrel piece 28 after crimping the electric wire with terminal 10, the base end side of the first barrel piece 27 and the tip end 28B of the second barrel piece 28. A gap G may be formed at a portion where and overlap. Even in such a case, it is possible to obtain the same effect as the above-mentioned experimental example.

(7) In the above embodiment, the bottom plate 23 has the projection 24 and the recess 25 formed in advance, but the configuration is not limited to this. For example, using the terminal 20 without the convex portion 24 and the concave portion 25 formed thereon, the terminal 20 is mounted on the mounting surface 31 of the anvil 30 having the protruding portion 32 formed on the mounting surface 31, and the crimper 34 is lowered. Accordingly, the convex portion 24 and the concave portion 25 may be formed on the bottom plate portion 23 during the pressure bonding step.

10: Electric wire with terminal 11: Electric wire 12: Conductor portion 20: Terminal 23: Bottom plate portion 24: Convex portion 27: First barrel piece (barrel piece)
28: Second barrel piece (barrel piece)
30: Anvil 34: Crimper P (PA, PB): Conductor compressibility S1, S2: Cross sectional area

Claims

An electric wire having a conductor portion,
A terminal electrically connected to the electric wire,
The terminal has a bottom plate portion on which the electric wire is placed, a first barrel piece extending from the bottom plate portion and wound around the outer periphery of the electric wire, and a terminal extending from the bottom plate portion longer than the first barrel piece. An outer circumference and a second barrel piece wrapped around the first barrel piece,
The cross-sectional area S1 of the conductor portion before the electric wire is crimped by the first barrel piece and the second barrel piece, and the cross section after the electric wire is crimped by the first barrel piece and the second barrel piece The conductor compression rate P defined by the cross-sectional area S2 of the conductor portion is conductor compression rate P [%] = (cross-sectional area S2 / cross-sectional area S1) × 100,
Of the conductor compression ratio P, the conductor compression ratio PA that maximizes the contact area between the first barrel piece and the second barrel piece after the electric wire is crimped by the first barrel piece and the second barrel piece. And the conductor compression rate PB at which the contact area between the first barrel piece and the conductor portion after the electric wire is crimped by the first barrel piece and the second barrel piece satisfies the following formula: , Electric wire with terminals.
PA <PB ... Formula
The electric wire with a terminal according to claim 1, wherein the conductor compression rate PA is in the range of 20% to 40%.
The electric wire with a terminal according to claim 1 or 2, wherein the conductor compression rate PB is in the range of 40% to 70%.
The electric wire with a terminal according to any one of claims 1 to 3, wherein a convex portion that protrudes toward the conductor portion is formed on the bottom plate portion.