JP2024120615A - Terminals - Google Patents

Abstract

To provide a terminal capable of reducing contact resistance while improving the strength against the pull-out of a core wire.SOLUTION: A terminal 1 includes a core wire crimping part 10. The core wire crimping part 10 has a recess 10a provided on the inner surface that contacts a core wire 51 of an electric wire 50. An opening is formed in the recess 10a. The opening consists of a first line 11 that is perpendicular to a first direction D1 in which the core wire 51 to be crimped extends, a second line 12 that intersects the first direction D1 and is formed in an arc shape, a third line 13 that connects one end of the first line 11 with one end of the second line 12, and a fourth line 14 that connects the other end of the first line 11 with the other end of the second line 12.SELECTED DRAWING: Figure 2

Description

The present invention relates to a terminal.

Patent document 1 discloses a terminal that is connected to the end of an electric wire. This terminal has a core wire crimping portion that is crimped to the core wire of the electric wire. The core wire crimping portion has multiple grooves that extend in a direction that intersects with the direction in which the crimped core wire extends.

In the terminal described in Patent Document 1, when the core wire crimping portion is crimped to the core wire, the core wire is pressed against the groove portion. This groove bends the core wire, improving its strength against removal from the core wire crimping portion. In addition, the edge of the groove cuts the oxide film formed on the surface of the core wire, and the conductive part of the core wire covered with the oxide film comes into electrical contact with the core wire crimping portion. This contact reduces the contact resistance between the core wire and the core wire crimping portion.

JP 2010-9789 A

The terminal described in Patent Document 1 has a problem in that it is not strong enough to prevent the core wire from coming out of the core wire crimping portion because it simply has a groove in a direction that intersects with the direction in which the crimped core wire extends. Also, because the groove is simply provided, the edge of the groove does not adequately cut the oxide film on the surface of the core wire, and the amount of electrical contact between the conductive part of the core wire and the core wire crimping portion is insufficient. Therefore, the terminal described in Patent Document 1 has a problem in that it does not adequately reduce the contact resistance between the core wire and the core wire crimping portion.

The present invention was made in light of the above circumstances, and aims to provide a terminal that can reduce contact resistance while improving the strength against the core wire being pulled out.

In order to achieve the above object, the terminal according to the present invention comprises:
The core wire crimping portion has a recess having an opening formed therein, the recess being formed on an inner surface that comes into contact with the core wire, the recess being composed of a first line perpendicular to a first direction in which the core wire to be crimped extends, a second line intersecting the first direction and formed in an arc shape, a third line connecting one end of the first line and one end of the second line, and a fourth line connecting the other end of the first line and the other end of the second line.

The first wire may be formed at a position closer to the tip of the core wire than the second wire when the core wire is crimped to the core wire crimping section.

The second wire may be formed in an arc shape that protrudes farther from the tip of the core wire than the first wire when the core wire is crimped to the core wire crimping section.

The third line and the fourth line may include portions that are formed at different inclinations.

the third wire and the fourth wire are formed to spread apart from each other at a position farther from a tip of the core wire than the first wire when the core wire is crimped to the core wire crimping portion,
The second line may have a length greater than a length of the first line.

There may be multiple recesses.

The recesses adjacent to each other in the first direction may be formed at positions offset in a second direction perpendicular to the first direction.

The first line may be formed as a straight line.

The terminal according to the present invention comprises:
a main body portion provided at one end of the core wire crimping portion and to which a mating terminal is connected;
a coating crimping portion provided at an end portion of the core wire crimping portion closer to the other end and crimped to an insulating coating portion that covers the core wire;
The device may include:

The present invention provides a terminal that can reduce contact resistance while improving the strength against core wire pullout.

1 is a perspective view (part 1) of a terminal according to an embodiment of the present invention; FIG. 2 is a second perspective view of a terminal according to an embodiment of the present invention; 1 is a plan view of a plate material before being bent to form a terminal according to an embodiment; FIG. 4 is an enlarged view of a portion of an inner surface of a core wire crimping portion of a terminal according to an embodiment. FIG. 5 is an enlarged view of a recess formed on an inner surface of a core wire crimping portion of the terminal according to the embodiment. FIG. 1 is a partially enlarged plan view of a plate material before a terminal is formed by bending according to an embodiment; FIG. 1A and 1B are cross-sectional views for explaining the effect of a terminal according to an embodiment of the present invention. 13 is an enlarged view of a recess formed on an inner surface of a core wire crimping portion of a terminal according to Modification 1. FIG. 11 is an enlarged view of a recess formed on an inner surface of a core wire crimping portion of a terminal according to Modification 2. FIG.

The terminal 1 according to an embodiment of the present invention will be described below with reference to the drawings. For ease of understanding, XYZ coordinates are set and referred to as appropriate. The Y-axis direction of the XYZ coordinates is the same as the first direction D1 in which the core wire 51 of the electric wire 50 crimped by the terminal 1 extends, as shown in FIG. 1. The X-axis direction and the Z-axis direction are perpendicular to the first direction D1.

The terminal 1 is used, for example, in a connector as an electronic circuit component equipped in an automobile part. As shown in FIG. 2, the terminal 1 is a female terminal that is connected to a mating terminal 100, which is a male terminal, and extends in the Y-axis direction. As shown in FIG. 3, the terminal 1 is formed by bending a piece of conductive plate material 1a that has been cut from the carrier 40 along a cutting line L1. As shown in FIGS. 1 and 2, the terminal 1 includes a core wire crimping portion 10, a main body portion 20, and a coating crimping portion 30.

The core wire crimping portion 10 is crimped to the conductive core wire 51 of the electric wire 50 by crimping, and is electrically connected to the core wire 51. As shown in Figures 1 and 3, the core wire crimping portion 10 has a plurality of recesses 10a on the inner surface that contacts the core wire 51.

As shown in Figures 4 and 5, the recess 10a has an opening formed therein, which is made up of a first line 11, a second line 12, a third line 13, and a fourth line 14.

The first line 11 is a line perpendicular to the first direction D1 or the Y-axis direction. In this embodiment, the first line 11 is formed as a straight line. The first line 11 is also formed at a position closer to the -Y direction than the second line 12. In more detail, the first line 11 is formed at a position closer to the tip 51a of the core wire 51 than the second line 12 in the state shown in FIG. 2 where the core wire 51 is crimped to the core wire crimping portion 10.

The second line 12 is a line that intersects with the first direction D1, as shown in Figs. 4 and 5. The second line 12 is provided as a line closer to the +Y side of the opening of the recess 10a, and is formed in an arc shape. In this embodiment, the second line 12 is formed in an arc shape that protrudes in the +Y direction. More specifically, in the state shown in Fig. 2 in which the core wire 51 is crimped to the core wire crimping portion 10, the second line 12 is formed in an arc shape that protrudes farther from the tip 51a of the core wire 51 than the first line 11. Furthermore, as shown in Fig. 5, in this embodiment, the second line 12 is formed so that its length L2 is longer than the length L1 of the first line 11.

As shown in Figures 4 and 5, the third line 13 connects one end of the first line 11 and one end of the second line 12, and is provided as a line closer to the -X side of the opening of the recess 10a. In this embodiment, the third line 13 has a straight line portion 13a that is formed as a straight line, and a curved portion 13b that is connected to one end of the first line 11 and is rounded.

The fourth line 14 connects the other end of the first line 11 and the other end of the second line 12, and is provided as a line closer to the +X side of the opening of the recess 10a. In this embodiment, the fourth line 14 has a straight line portion 14a that is formed as a straight line, and a curved portion 14b that is connected to the other end of the first line 11 and is rounded. The straight line portion 14a of the fourth line 14 is not formed so as to be parallel to the straight line portion 13a of the third line 13, but is formed at a different inclination from the straight line portion 13a of the third line 13.

Furthermore, the fourth line 14, which has a straight portion 14a and a curved portion 14b, is formed so as to extend from the third line 13, which has a straight portion 13a and a curved portion 13b, in the +Y direction.

The recess 10a configured as described above is formed with a substantially rectangular opening by combining four lines, the first line 11, the second line 12, the third line 13, and the fourth line 14. In this embodiment, a plurality of recesses 10a are formed. Among the plurality of recesses 10a, adjacent recesses 10a in the first direction D1 are formed at positions shifted in the second direction D2 perpendicular to the first direction D1.

6, the inner surface of the core wire crimping portion 10 is formed with a first recess row C1, a second recess row C2, a third recess row C3, a fourth recess row C4, a fifth recess row C5, and a sixth recess row C6, each of which has a plurality of recesses 10a arranged in a row. The first recess row C1 is composed of a plurality of recesses 10a arranged at equal intervals along the circumferential direction D3, which is a direction parallel to the first direction D1. The second recess row C2, the third recess row C3, the fourth recess row C4, the fifth recess row C5, and the sixth recess row C6 are also composed of a plurality of recesses 10a arranged at equal intervals along the circumferential direction D3. The recesses 10a constituting the first, third and fifth recess rows C1, C3 and C5 of the multiple recess rows are formed at positions shifted in the circumferential direction D3 with respect to the recesses 10a constituting the second, fourth and sixth recess rows C2, C4 and C6. The recesses 10a constituting the first recess row C1 are formed at the same position in the circumferential direction D3 with respect to the recesses 10a constituting the third recess row C3 and the fifth recess row C5. The recesses 10a constituting the second recess row C2 are formed at the same position in the circumferential direction D3 with respect to the recesses 10a constituting the fourth recess row C4 and the sixth recess row C6. However, this is not limited to this. The positions in the circumferential direction D3 of the recesses 10a constituting the first to sixth recess rows C1 to C6 are arbitrary. For example, each of the recesses 10a constituting the first to sixth recess rows C1 to C6 may be formed at a position shifted in the circumferential direction D3.

As shown in Figures 1 and 2, the main body 20 is provided at the end of the core wire crimping portion 10 closer to the -Y direction. The main body 20 is made of a conductive material such as copper or a copper alloy. The main body 20 is formed in a rectangular tube shape extending in the first direction D1. The mating terminal 100 is inserted into the rectangular tube portion of the main body 20 and electrically connected. The main body 20 has an elastic plate (not shown) and a reverse insertion prevention protrusion 21.

The elastic plate is disposed inside the angular tube-shaped portion of the main body 20. The elastic plate is provided so as to be flexible in the Z-axis direction. The elastic plate may be integrally formed with the angular tube-shaped portion of the main body 20. Alternatively, the elastic plate may be formed separately from the angular tube-shaped portion of the main body 20 and inserted into the angular tube-shaped portion of the main body 20.

The reverse insertion prevention protrusion 21 is formed to protrude in the +Z direction from the square cylindrical portion of the main body 20. The reverse insertion prevention protrusion 21 is intended to prevent the operator from inserting the terminal 1 upside down when inserting the terminal 1 into the connector housing.

The coating crimping part 30 is provided at the end of the core wire crimping part 10 closer to the +Y direction. This coating crimping part 30 presses the end of the insulating coating part 52 of the electric wire 50 by crimping, and protects the connection part between the core wire crimping part 10 and the core wire 51 from the force that would pull out the electric wire 50 in the +Y direction.

As described above, in the terminal 1 according to the first embodiment, as shown in Figs. 4 and 5, the opening of the recess 10a is composed of the first wire 11 perpendicular to the first direction D1, the second wire 12 formed in an arc shape, and the third wire 13 and the fourth wire 14 connecting both ends of the first wire 11 and both ends of the second wire 12. Therefore, in the first embodiment, as shown in Fig. 1, the recess 10a bites into the outer circumferential surface of the core wire 51. Then, as shown in Figs. 7(A) and (B), the opening of the recess 10a has the third wire and the fourth wire 14 in addition to the first wire 11 and the second wire 12, so that when the oxide coating 53 is formed on the outer circumferential surface of the core wire 51, the entire length of the edge of the opening can be secured long, and the cutting length of the oxide coating 53 can be secured. Since the cutting length of the oxide coating 53 can be secured, the electrical contact portion between the conductive portion of the core wire 51 covered with the oxide coating 53 and the core wire crimping portion 10 can be secured. As a result, as shown in FIG. 1, in this embodiment 1, it is possible to provide a terminal 1 that can reduce the contact resistance between the core wire crimping portion 10 and the core wire 51 while improving the strength against the core wire 51 being pulled out of the core wire crimping portion 10.

In addition, in this embodiment 1, as shown in FIG. 2, the opening of the recess 10a has a first line 11 that is perpendicular to the first direction D1 and formed in a straight line, and a second line 12 that intersects with the first direction D1 and is formed in an arc shape. This makes it possible to further increase the effect of strength against the core wire 51 coming out of the core wire crimping portion 10 in this embodiment 1. Also, it is possible to further increase the effect of reducing the contact resistance between the core wire crimping portion 10 and the core wire 51.

In addition, in this embodiment 1, the second wire 12 is formed in an arc shape. Therefore, the length of the second wire 12 can be made longer compared to when the second wire 12 is straight. As a result, in this embodiment 1, the effect of strength against removal of the core wire 51 from the core wire crimping portion 10 can be further improved. Also, the effect of reducing the contact resistance between the core wire crimping portion 10 and the core wire 51 can be further improved.

In addition, in this embodiment 1, the third wire 13 and the fourth wire 14 include straight line portions 13a, 14a that are formed at different inclinations. As a result, in this embodiment 1, the effect of strength against removal of the core wire 51 from the core wire crimping portion 10 can be further improved. In addition, the effect of reducing the contact resistance between the core wire crimping portion 10 and the core wire 51 can be further improved.

The above describes an embodiment of the present invention, but the present invention is not limited to the above embodiment.

For example, in this embodiment, the second line 12 is formed in an arc shape that protrudes in the +Y direction as shown in FIG. 5. However, this is not limited to this. As shown in FIG. 8, the second line 12 may be formed in an arc shape that protrudes in the -Y direction, which is the opposite direction to the +Y direction. In this case, the third line 13 has a straight portion 13a and a curved portion 13b, as well as a curved portion 13c that is connected to one end of the second line 12 and is rounded. Also, the fourth line 14 has a straight portion 14a and a curved portion 14b, as well as a curved portion 14c that is connected to the other end of the second line 12 and is rounded.

In addition, in this embodiment, as shown in FIG. 5, the third line 13 has a straight line portion 13a and a curved line portion 13b. The fourth line 14 has a straight line portion 14a and a curved line portion 14b. However, this is not limited to this. As shown in FIG. 9, the third line 13 may have only the straight line portion 13a without the curved line portion 13b. The fourth line 14 may have only the straight line portion 14a without the curved line portion 14b.

In addition, in this embodiment, as shown in FIG. 5, the first line 11 is formed at a position closer to -Y than the second line 12. However, this is not limited to this. The first line 11 may be formed at a position closer to +Y than the second line 12, which is the opposite of the position closer to -Y.

In addition, in this embodiment, as shown in FIG. 6, six recess rows are formed on the inner surface of the core wire crimping portion 10, with multiple recesses 10a arranged in a row. However, this is not limited to this. The number of recess rows may be other than six. Furthermore, the number of recess rows and the number of recesses 10a may be changed as appropriate depending on, for example, the size of the terminal 1.

The present invention allows for various embodiments and modifications without departing from the broad spirit and scope of the present invention. The above-described embodiments are intended to explain the present invention and are not intended to limit the scope of the present invention.

1: terminal, 1a: plate material, 10: core wire crimping portion, 10a: recess, 11: first wire, 12: second wire, 13: third wire, 13a: straight portion, 13b, 13c: curved portion, 14: fourth wire, 14a: straight portion, 14b, 14c: curved portion, 20: main body, 21: reverse insertion prevention protrusion, 30: coating crimping portion, 40: carrier, 50: electric wire, 51: core wire, 51a: tip, 52: coating portion, 53: oxide coating, 100: mating terminal, C1: first recess row, C2: second recess row, C3: third recess row, C4: fourth recess row, C5: fifth recess row, C6: sixth recess row, D1: first direction, D2: second direction, D3: circumferential direction, L1: cutting line.

Claims (9)

A terminal having a core wire crimping portion in which a recess is formed with an opening formed by a first line perpendicular to a first direction in which the core wire to be crimped extends, a second line intersecting the first direction and formed in an arc, a third line connecting one end of the first line and one end of the second line, and a fourth line connecting the other end of the first line and the other end of the second line, is provided on the inner surface that comes into contact with the core wire. The terminal according to claim 1, wherein the first wire is formed at a position closer to the tip of the core wire than the second wire when the core wire is crimped to the core wire crimping section. The terminal according to claim 1, wherein the second wire is formed in an arc shape that protrudes farther from the tip of the core wire than the first wire when the core wire is crimped to the core wire crimping section. The terminal according to claim 1, wherein the third line and the fourth line include portions formed at different inclinations. the third wire and the fourth wire are formed to spread apart from each other at a position farther from a tip of the core wire than the first wire when the core wire is crimped to the core wire crimping portion,
The terminal of claim 4 , wherein the length of the second wire is greater than the length of the first wire. The terminal according to claim 1, in which a plurality of recesses are formed. The terminal according to claim 6, wherein the recesses adjacent to each other in the first direction are formed at positions offset in a second direction perpendicular to the first direction. The terminal according to claim 1, wherein the first line is formed as a straight line. a main body portion provided at one end of the core wire crimping portion and to which a mating terminal is connected;
a coating crimping portion provided at an end portion of the core wire crimping portion closer to the other end and crimped to an insulating coating portion that covers the core wire;
A terminal according to any one of claims 1 to 8, comprising:

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