JP2023169988A - wire with terminal - Google Patents

Abstract

To provide a wire with a terminal which attains improvement in durability by reducing a load acting on an insulation coating part of a wire.SOLUTION: A wire 100 with a terminal comprises: a wire W coating a conductor part W1 with an insulation coating part W2; and a crimp terminal 1 including a conductor crimp part 46 which is crimped with the conductor part W1 exposed from a terminal of the insulation coating part W2, and a coating crimp part 48 which is crimped to the insulation coating part W2. The insulation crimp part 48 includes: a base part 41 extending in an axial direction X of the wire W; and a pair of barrel pieces 44 and 45 respectively extending from the base part 41 to both sides in a circumferential direction D1 around an axis. The coating crimp part 48 is crimped while enclosing an entire circumference of the insulation coating part W2 in the circumferential direction D1 by the base part 41 and the pair of barrel pieces 44 and 45 in such a manner that tip end portions of the pair of barrel pieces 44 and 45 overlap each other. In the pair of barrel pieces 44 and 45, only the barrel piece 45 which is positioned inside during the crimp becomes thinner toward the tip end in the circumferential direction D1.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric wire with a terminal.

A conventional electric wire with a terminal includes a covered electric wire and a crimp terminal. The crimp terminal has a conductor crimp part and a cover crimp part. The conductor crimping part crimps the conductor part of the electric wire for electrical connection, and the covering crimping part crimps the insulating coating part of the electric wire to fix it. The cover crimping portion is constituted by a pair of barrel pieces. The pair of barrel pieces are wrapped around the insulating coating and crimped so that their tips overlap with each other. Examples of such terminal-equipped electric wires include those described in the following patent documents.

Japanese Patent Application Publication No. 2022-017693 Japanese Patent Application Publication No. 2011-044423

As described above, the pair of barrel pieces constituting the cover crimping part of the crimp terminal are wound around the insulating cover part, and are crimped in an overlapping manner so that their tips overlap with each other. The crimp terminal constitutes a corrosion-proof terminal protected from corrosion by the corrosion-proofing material. In this case, in the electric wire with a terminal, since the corrosion-proof terminal is inserted into the housing cavity, the thickness and width of the covered crimped portion are set small in consideration of the thickness of the corrosion-proof material. Then, when the pair of barrel pieces are wrapped around the insulation coating and crimped, a load may be applied to the insulation coating and the insulation coating may be damaged. Therefore, in the conventional electric wire with a terminal, there is room for improvement in the structure in which the insulation crimping part crimps the insulation coating part of the electric wire.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric wire with a terminal that improves durability by reducing the load acting on the insulation coating of the electric wire.

In order to achieve the above object, an electric wire with a terminal according to the present invention includes an electric wire that covers a conductive portion having conductivity with an insulating sheathing portion having insulating properties, and a wire that covers a conductive portion having conductivity with an insulating sheathing portion having insulating properties, and a a crimp terminal including a conductor crimping part that is crimped to the conductor crimping part and a covering crimping part that is crimped to the insulation covering part, and the covering crimping part includes a base part that extends along the axial direction of the electric wire. and a pair of barrel pieces extending from the base to both sides in the circumferential direction along the axial line, and the covering crimping part connects the base and the pair of barrel pieces so that the tip ends of the pair of barrel pieces overlap. The entire circumference of the insulating coating part in the circumferential direction is wrapped and crimped, and of the pair of barrel pieces, only the barrel piece located on the inside at the time of crimping has a thickness that decreases toward the tip in the circumferential direction. Become thin.

In the electric wire with a terminal according to the present invention, the sheathing crimping part that is crimped to the insulation sheathing part of the electric wire includes a pair of barrel pieces, and of the pair of barrel pieces, only the barrel piece located inside when crimping is attached to the periphery. The thickness becomes thinner towards the tip. Therefore, when the insulation crimping part is crimped to the insulation coating of the electric wire, the amount of compressive displacement of the insulation insulation coating decreases, and by reducing the load acting on the insulation coating from the insulation crimping part, the durability of the insulation crimping part is improved. This has the effect that improvements can be made.

FIG. 1 is an exploded perspective view showing a schematic configuration of an electric wire with a terminal according to this embodiment. FIG. 2 is a schematic side view showing the crimp terminal before crimping. FIG. 3 is a sectional view taken along the line III--III in FIG. 2 showing the cover crimping portion of the crimp terminal before crimping. FIG. 4 is a sectional view showing an electric wire with a terminal. FIG. 5 is a sectional view showing a shape comparison between a conventional covering crimping part and a covering crimping part of this embodiment. FIG. 6 is an exploded perspective view showing a schematic configuration of an electric wire with a terminal according to a reference example. FIG. 7 is a sectional view showing the cover crimping portion of the crimp terminal before crimping. FIG. 8 is a sectional view showing the cover crimping portion of the crimp terminal after crimping.

Embodiments according to the present invention will be described in detail below based on the drawings. Note that the present invention is not limited to this embodiment. Furthermore, the constituent elements in the embodiments described below include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

In the following explanation, among the first direction, second direction, and third direction that intersect with each other, the first direction is referred to as the "axial direction X," the second direction is referred to as the "width direction Y," and the third direction is referred to as the "width direction Y." The direction is called "height direction Z". Here, the axial direction X, the width direction Y, and the height direction Z are substantially orthogonal to each other. The axial direction X typically corresponds to the direction along the axis X1 (see FIG. 1, etc.) of the electric wire on which the crimp terminal is provided, the direction in which the electric wire extends, the insertion and removal direction between the crimp terminal and the mating terminal, etc. do. The width direction Y and the height direction Z correspond to a direction intersecting the axial direction X. The height direction Z typically corresponds to the thickness direction of the base, the direction in which the conductor of the wire is exposed from the middle part of the crimp terminal, the direction in which corrosion protection is applied to the conductor part exposed from the middle part, etc. . In the following description, the direction along the axis X1 in the state after the crimp terminal is crimped will be referred to as the "circumferential direction D1." Further, each direction used in the following description represents a direction in a state where each part is assembled with each other, unless otherwise specified.

[Embodiment]
FIG. 1 is an exploded perspective view showing a schematic configuration of an electric wire with a terminal according to the present embodiment, and FIG. 2 is a schematic side view showing a crimp terminal before crimping.

As shown in FIGS. 1 and 2, the electric wire 100 with a terminal is applied to a wire harness or the like used in a vehicle. Here, the wire harness is, for example, a bundle of a plurality of electric wires W used for power supply and signal communication for connection between various devices mounted on a vehicle as a collective part, and a connector etc. is connected to each device.

The electric wire 100 with a terminal includes an electric wire W and a crimp terminal 1 which is crimped to the end of the electric wire W and is electrically connected. However, the electric wire 100 with a terminal also includes an anticorrosive material that covers the electric wire W and the main parts of the crimp terminal 1 to prevent corrosion. Hereinafter, each structure of the electric wire 100 with a terminal will be explained in detail.

The electric wire W is wired in the vehicle and electrically connects each device. The electric wire W includes a linear conductor portion W1 having electrical conductivity and an insulating coating portion W2 having insulation properties covering the outside of the conductor portion W1. The electric wire W is an insulated wire in which a conductor portion W1 is covered with an insulating coating portion W2.

The conductor portion W1 is a core wire made by bundling a plurality of conductive metal wires. The conductor portion W1 may be a twisted core wire made by twisting a plurality of metal wires together. The insulation coating part W2 is a wire coating that covers the outer peripheral side of the conductor part W1. The insulating coating W2 is formed by, for example, extrusion molding an insulating resin material (PP, PVC, crosslinked PE, etc., which is appropriately selected in consideration of abrasion resistance, chemical resistance, heat resistance, etc.). It is formed.

The electric wire W extends linearly along the axis X1, and is formed to have substantially the same diameter in the extending direction (axial direction X). In the electric wire W, the cross-sectional shape of the conductor portion W1 (the cross-sectional shape in the direction intersecting the axial direction It has a cross-sectional shape. At least one end of the electric wire W has the insulation coating part W2 stripped off, and the conductor part W1 is exposed from the insulation coating part W2. In the electric wire W, a crimp terminal 1 is provided at the end of a conductor portion W1 exposed from an insulating coating portion W2.

The crimp terminal 1 is a terminal fitting to which an electric wire W is electrically connected and a mating terminal having conductivity is connected. The crimp terminal 1 includes an electrical connection part 2, a connecting part 3, and a wire crimp part 4. The electrical connection portion 2, the connection portion 3, and the wire crimping portion 4 are integrally made of a metal member having conductivity. For example, the crimp terminal 1 is manufactured by processing a single sheet metal sheet by various processes such as punching, pressing, and bending to match the shape of each part such as the electrical connection part 2, the connection part 3, and the wire crimping part 4. By molding, each part is integrally formed in three dimensions. In the crimp terminal 1, the electrical connection portion 2, the connection portion 3, and the wire crimping portion 4 are arranged in this order from one side to the other side along the axial direction X and are interconnected.

The electrical connection part 2 is a part that is electrically connected to a mating terminal. The electrical connection portion 2 may have a male terminal shape or a female terminal shape. The electrical connection portion 2 of this embodiment is illustrated as a female terminal shape, and is electrically connected to a mating terminal having a male terminal shape. Note that the electrical connection portion 2 may be configured to be electrically connected not only to a mating terminal but also to various conductive members such as a grounding member. In this case, the electrical connection portion 2 may be in the shape of a so-called round terminal (LA terminal), which is fastened to a ground member or the like, for example.

The connecting portion 3 is a portion that is interposed between the electrical connecting portion 2 and the wire crimping portion 4 and connects the electrical connecting portion 2 and the wire crimping portion 4 for electrical conduction. In the crimp terminal 1, the electrical connection portion 2 and the wire crimping portion 4 are electrically connected via the connecting portion 3, and the electrical connection portion 2 and the conductor portion W1 of the wire W are electrically connected via the wire crimping portion 4. connected to and conductive.

The electric wire crimping part 4 is a part to which the electric wire W is connected and electrically connects the end of the electric wire W and the crimp terminal 1. The wire crimping portion 4 is provided at the end of the wire W by being crimped and crimped to the end of the wire W. The wire crimping section 4 includes a base 41 and two pairs of barrel pieces 42, 43, 44, and 45. The wire crimping portion 4 is crimped and crimped onto the wire W by the base 41 and two pairs of barrel pieces 42, 43, 44, and 45.

The wire crimping part 4 includes a conductor crimping part 46, an intermediate part 47, and a covering crimping part 48, which are formed by a base 41 and two pairs of barrel pieces 42, 43, 44, and 45. In other words, the wire crimping section 4 includes a base 41, a conductor crimping section 46 constituted by two pairs of barrel pieces 42, 43, 44, and 45, an intermediate section 47, and a covering crimping section 48. Ru.

The conductor crimping section 46 is constituted by a part of the base 41 and a pair of barrel pieces 42 and 43. The intermediate portion 47 is constituted by a part of the base portion 41 . The cover crimping part 48 is constituted by a part of the base 41 and a pair of barrel pieces 44 and 45. The wire crimping parts 4 are lined up and interconnected in the order of the conductor crimping part 46, the intermediate part 47, and the covering crimping part 48 from the electrical connection part 2 side to the opposite side along the axial direction X. The wire crimping section 4 constitutes a so-called separate barrel-type crimping section in which a pair of barrel pieces 42 and 43 and a pair of barrel pieces 44 and 45 are separated through an intermediate portion 47.

Specifically, the base portion 41 is a portion that extends along the axial direction X and becomes the bottom wall of the wire crimping portion 4 formed in a substantially U-shape in a state before the crimp terminal 1 is crimped. The base portion 41 is formed into a plate shape with a thickness direction along the height direction Z. The end portion of the electric wire W is placed on the base portion 41 during the crimping process. The electrical connection portion 2 is connected to the base portion 41 on one side in the axial direction X via the connection portion 3 . The base portion 41 has both end portions in the width direction Y rising along the height direction Z at each portion.

More specifically, the base portion 41 is continuous along the axial direction X over the conductor crimping portion 46, the intermediate portion 47, and the covering crimping portion 48. In other words, the base portion 41 is configured by a first base portion 41a forming the conductor crimping portion 46, a second base portion 41b forming the intermediate portion 47, and a third base portion 41c forming the cover crimping portion 48, all connected in the axial direction X. be done. The electrical connection portion 2 of the base portion 41 is connected to one end in the axial direction X of the first base portion 41a. In addition, the base 41 is connected to a carrier at the other end of the third base 41c in the axial direction X before the crimping process, and is cut from the carrier during the crimping process, for example.

The pair of barrel pieces 42 and 43 constitute a conductor crimping section 46 together with the first base 41a, which is a part of the base 41. The conductor crimping portion 46 is a portion that is crimped and crimped to the conductor portion W1 of the electric wire W, thereby being electrically connected to the conductor portion W1. The conductor crimping section 46 is provided on one end side of the wire crimping section 4 in the axial direction X, here, on the electrical connection section 2 side.

The pair of barrel pieces 42 and 43 are formed in the conductor crimping part 46 and extend in a band shape from the first base 41a to both sides in the width direction Y (circumferential direction D1 in the state after crimping), and are connected to the first base 41a. This is a portion that is crimped and crimped with the conductor portion W1 of the electric wire W wrapped therebetween. The pair of barrel pieces 42 and 43 are portions that become side walls of the U-shaped wire crimping section 4 before crimping. One barrel piece 42 extends from the first base 41a to one side in the width direction Y. The other barrel piece 43 extends from the first base 41a to the other side in the width direction Y. Before the pair of barrel pieces 42 and 43 are crimped and crimped to the conductor portion W1 of the electric wire W, the first base portion 41a is bent, and together with the first base portion 41a, approximately U It is shaped like a letter.

The pair of barrel pieces 42 and 43 are wound around the conductor part W1, crimped, and crimped, so that the ends 42a and 43a do not overlap with each other (do not overlap). The length from the root to the tip is set. The conductor crimping part 46 wraps the outside of the conductor part W1 of the electric wire W arranged between the pair of barrel pieces 42 and 43 by the first base part 41a and the pair of barrel pieces 42 and 43, and is attached to the conductor part W1. It is crimped and crimped.

The pair of barrel pieces 42 and 43 are crimped, for example, by a so-called B crimp. In the B crimp, the conductor crimping part 46 is crimped by the first base 41a and the pair of barrel pieces 42, 43, wrapping the entire circumference of the conductor part W1 in the circumferential direction D1. Each of them is bent toward the first base 41a side. In this state, the conductor crimping part 46 is crimped and crimped so that the tips 42a and 43a of the pair of barrel pieces 42 and 43 are brought into contact with and pressed against the conductor part W1, respectively.

The conductor crimping part 46 may have an indent 46a on the inner surface of the conductor crimping part 46 to increase the contact area with the conductor part W1, improve contact stability, and improve adhesion strength. Here, the inner surface of the conductor crimping portion 46 is the surface of the first base portion 41a and the pair of barrel pieces 42, 43 that comes into contact with the conductor portion W1. Further, the conductor crimping portion 46 is not limited to the above-mentioned type, and may be crimped by crimping, for example, a so-called overlap crimp. In the overlap crimp, the conductor crimping portion 46 is configured so that the pair of barrel pieces 42 and 43 are wrapped around the electric wire W, crimped, and crimped so that the ends 42a and 43a overlap each other (overlap). It is composed of

The pair of barrel pieces 44 and 45 constitute the covering crimping part 48 together with the third base 41c, which is a part of the base 41. The covering crimping part 48 is a part that is fixed to the insulating covering part W2 of the electric wire W by being crimped and crimped to the insulating covering part W2. The covering crimping part 48 is provided on the other end side of the wire crimping part 4 in the axial direction X, here, on the opposite side to the electrical connection part 2 side.

The pair of barrel pieces 44 and 45 are formed in the cover crimping part 48 and extend in a band shape from the third base 41c to both sides in the width direction Y (circumferential direction D1 in the state after crimping), and are connected to the third base 41c. This is a part that is crimped and crimped with the insulating coating part W2 of the electric wire W wrapped therebetween. The pair of barrel pieces 44 and 45 are portions that become side walls of the U-shaped wire crimping section 4 before crimping. One barrel piece 44 extends from the third base portion 41c to one side in the width direction Y. The other barrel piece 45 extends from the third base 41c to the other side in the width direction Y. Before the pair of barrel pieces 44 and 45 are crimped and crimped to the insulation coating part W2 of the electric wire W, the third base part 41c is bent, and together with the third base part 41c, the pair of barrel pieces 44 and 45 are approximately bent. It is formed into a U-shape.

The pair of barrel pieces 44 and 45 are wound around the insulating coating part W2, caulked, and crimped, and the tips 44a and 45a overlap each other (overlap) at the base of the third base 41c side. The length from to the tip is set. The covering crimping part 48 wraps the outside of the insulation covering part W2 of the electric wire W disposed between the pair of barrel pieces 44 and 45 by the third base part 41c and the pair of barrel pieces 44 and 45, so that the insulation covering part W2 It is crimped and crimped against.

The barrel pieces 44 and 45 are, for example, crimped by what is called an overlap crimp. In the overlap crimp, the covering crimping part 48 is crimped by the third base 41c and the pair of barrel pieces 44, 45, wrapping the entire circumference of the insulation covering part W2 in the circumferential direction D1, with the ends 44a, 45a side They are placed in a state where they overlap each other.

In the wire crimping part 4, an intermediate part 47 is interposed between the covering crimping part 48 and the conductor crimping part 46 in the axial direction X. The intermediate portion 47 is a portion that is interposed between the conductor crimping portion 46 and the covering crimping portion 48 and connects the conductor crimping portion 46 and the covering crimping portion 48 along the axial direction X. The intermediate part 47 is constituted by a second base part 41b, the first base part 41a of the conductor crimping part 46 is connected to one end of the second base part 41b in the axial direction X, and the covering crimping part is connected to the other end. 48 third base portions 41c are connected. Therefore, the pair of barrel pieces 42 and 43 that constitute the conductor crimping part 46 and the pair of barrel pieces 44 and 45 that constitute the covering crimping part 48 are mutually interposed by the interposition of the intermediate part 47 between them. It is divided and formed at intervals in the axial direction X.

Here, the third base portion 41c and the pair of barrel pieces 44 and 45 that constitute the cover crimping portion 48 will be described in detail. FIG. 3 is a sectional view taken along the line III--III in FIG. 2 showing the cover crimping portion of the crimp terminal before crimping.

As shown in FIGS. 1 and 3, the covering crimping portion 48 that is crimped onto the insulation covering portion W2 of the electric wire W includes a third base portion 41c of the base portion 41 and a pair of barrel pieces 44, 45. The covering crimping portion 48 is crimped around the entire circumference in the circumferential direction D1 by the third base portion 41c and the pair of barrel pieces 44, 45 so that the tips of the pair of barrel pieces 44, 45 overlap. In this case, in the covering crimping portion 48 of the present embodiment, only the barrel piece 45 located on the inside during crimping among the pair of barrel pieces 44 and 45 becomes thinner toward the tip in the circumferential direction D1.

To explain in detail, in the state before the crimping process, the third base portion 41c has a curved shape along the circumferential direction D1, and has a substantially constant thickness along the circumferential direction D1. The barrel piece 44 is connected to one end of the third base portion 41c in the circumferential direction D1 via a connecting portion 41d. That is, the barrel piece 44 has its base end 44b connected to the connecting portion 41d of the third base portion 41c. Moreover, the barrel piece 45 is connected to the other end of the third base portion 41c in the circumferential direction D1 via a connecting portion 41e. That is, the barrel piece 45 has its base end 45b connected to the connecting portion 41e of the third base portion 41c. A portion of the third base portion 41c including the connecting portions 41d and 41e has a curved shape along the circumferential direction D1. The pair of barrel pieces 44, 45 preferably have a substantially straight shape, but may be slightly curved. The cover crimping part 48 is formed in a U-shape in a state before crimping in which the pair of barrel pieces 44 and 45 are connected to both sides of the third base 41c. It is preferable that the third base 41c and the pair of barrel pieces 44, 45 in the connected state have an outer surface and an inner surface that are continuous without any step.

The barrel piece 44 has a base end 44b connected to the connecting portion 41d of the third base 41c, and a tip 44a extending in a direction away from the third base 41c. The barrel piece 44 has a substantially constant thickness from the base end 44b to the distal end 44a. In the barrel piece 44, an outer surface 44d outside the covering crimping portion 48 and an inner surface 44c inside the covering crimping portion 48 are flat surfaces without any steps. However, although the barrel piece 44 is provided with a chamfered portion 44e, which is a chamfered corner portion, at the tip 44a, the chamfered portion 44e may not be provided.

The barrel piece 45 has a base end 45b connected to the connecting portion 41e of the third base 41c, and a tip 45a extending in a direction away from the third base 41c. The thickness of the barrel piece 45 decreases from the base end 45b to the distal end 45a. In this case, the thickness of the base end 45b of the barrel piece 45 is the same as the thickness of the base end 44b of the barrel piece 44, and the thickness of the tip 45a of the barrel piece 45 is thinner than the thickness of the tip 44a of the barrel piece 44. . In the barrel piece 45, an outer surface 45d on the outside of the covering crimping part 48 and an inner surface 45c on the inside of the covering crimping part 48 are flat surfaces with no step. However, although the barrel piece 45 is provided with a chamfered portion 45e, which is a chamfered portion at the tip 45a, the chamfered portion 45e may not be provided. It is preferable that the thickness of the barrel piece 45 at the distal end 45a is 1/3 to 1/2 of the thickness at the base end 45b. The barrel piece 45 of this embodiment has a shape in which the thickness becomes thinner from the base end 45b toward the tip 45a, but the barrel piece 45 has a shape in which the thickness becomes thinner from the base end 45b toward the tip 45a. It is also possible to have a shape in which the thickness becomes thinner.

Hereinafter, a terminal-attached electric wire 100 in which a crimp terminal 1 is crimped to an end of an electric wire W and is electrically connected will be described. FIG. 4 is a sectional view showing an electric wire with a terminal.

As shown in FIG. 4, the crimp terminal 1 is crimped to the end of the electric wire W by crimping the conductor crimping part 46 to the conductor part W1 and crimping the covering crimping part 48 to the insulation covering part W2. In this state, the crimp terminal 1 has a contact portion formed between the conductor crimp portion 46 and the conductor portion W1, and is electrically connected to the conductor portion W1 of the electric wire W via the contact portion. The crimp terminal 1 is held in, for example, a connector housing, and the connector housing is fitted with the connector housing of a mating connector to connect the connector, thereby electrically connecting the crimp terminal 1 to the mating terminal and creating an electrical connection therebetween. A contact site is formed. As a result, the crimp terminal 1 is electrically connected to the mating terminal via the connection portion.

The conductor portion W1 of the electric wire W to which the crimp terminal 1 is crimped may be made of, for example, aluminum (Al) or an aluminum alloy. That is, in this case, the conductor portion W1 is a core wire made by bundling a plurality of metal wires made of aluminum or aluminum alloy. On the other hand, the crimp terminal 1 is constructed by plating the surface of a base material made of a different metal than the conductor portion W1, such as copper (Cu) or a copper alloy, with tin (Sn) or the like. There may be cases. In this case, in the electric wire 100 with a terminal, the material of the conductor portion W1 is aluminum or aluminum alloy, and the material of the crimp terminal 1 is copper or copper alloy, so that if water (salt water) etc. enters between the two, ionization of the two occurs. Due to the difference in tendency, galvanic corrosion may occur between the conductor portion W1 and the crimp terminal 1. Note that the above aluminum alloy is an alloy containing aluminum as a main component. Further, the above-mentioned copper alloy is an alloy containing copper as a main component, and includes, for example, so-called brass.

On the other hand, in the electric wire 100 with a terminal, galvanic corrosion is suppressed by applying a corrosion-preventing anticorrosion 10 to the electric wire crimping portion 4. The electric wire 100 with a terminal is protected against corrosion by covering the conductor portion W1 exposed from the crimp terminal 1 with the corrosion protection material 10. The anticorrosive material 10 is made of, for example, a UV (Ultraviolet) curable resin that is cured by irradiation with ultraviolet rays. As the UV curable resin, for example, urethane acrylate resin can be used, but it is not limited thereto. The anticorrosive material 10 has a paste-like UV curable resin applied to a predetermined area, and then is cured and retains its shape by being irradiated with ultraviolet rays. Here, the corrosion protection 10 is provided over the conductor crimping portion 46, the intermediate portion 47, the cover crimping portion 48, and the conductor portion W1 exposed from the crimp terminal 1. That is, here, the corrosion protection 10 includes the tip W1b of the conductor portion W1 exposed from the crimp terminal 1 along the axial direction X, the conductor crimp portion 46, the intermediate exposed portion W1a exposed from the intermediate portion 47, and the coating. It is provided across the crimp portion 48. Further, the anticorrosive material 10 is provided so as to penetrate into the inside of the wire crimping section 4 and between the wires of the conductor section W1. The anticorrosive material 10 is applied to and penetrated into each part, and then cured by being irradiated with ultraviolet rays to maintain its shape and cover each part. With this configuration, the crimp terminal 1 can be water-tightened by the anticorrosive material 10, and can prevent water (salt water, etc.) from entering the inside, and can suppress the occurrence of galvanic corrosion and the like.

Further, in the crimp terminal 1, when the covering crimping part 48 is crimped to the insulation covering part W2, the pair of barrel pieces 44 and 45 are wound around the insulation covering part W2 and crimped, and the tips of the crimp terminals 1 are crimped. The 44a and 45a sides overlap each other. At this time, in the covering crimping part 48, the barrel piece 44 is located on the inside and contacts the insulation covering part W2, and the barrel piece 44 is located on the outside and contacts the barrel piece 45. That is, in the cover crimping portion 48, the inner surface 45c of the barrel piece 45 is in close contact with the insulation coating portion W2, and the inner surface 44c of the barrel piece 44 is in close contact with the outer surface 45d of the barrel piece 45. The barrel piece 44 located on the outside has a substantially constant thickness, but the barrel piece 45 located on the inside has a tapered shape that becomes thinner toward the tip 45a. That is, in the pair of barrel pieces 44 and 45, at the tips 44a and 45a, which are wrapped around the insulating coating W2 and overlapped, the thickness of the barrel piece 45 located on the inside is thinner than the thickness of the barrel piece 44 located on the outside. . Therefore, when the insulation crimping part 48 is crimped to the insulation covering part W2, the amount of compressive displacement of the insulation covering part W2 by the insulation crimping part 48 is reduced, and the load acting on the insulation covering part W2 from the insulation crimping part 48 is reduced. .

The state of crimping of the insulation coating part W2 by the coating crimping part 48 will be described in detail. FIG. 5 is a sectional view showing a shape comparison between a conventional covering crimping part and a covering crimping part of this embodiment.

As shown in FIG. 5, in the conventional electric wire 001 with a terminal, the pair of barrel pieces 003 and 004 constituting the covered crimping part 002 are oriented from the base end to the distal end, similar to one barrel piece 44 of the present embodiment. The thicknesses t11 and t12 are substantially constant, and the thicknesses t11 and t12 are the same. In the conventional electric wire 001 with a terminal, the pair of barrel pieces 003 and 004 constituting the sheathing crimping part 002 are wrapped around the insulating sheathing part W2 and crimped, and in the crimped state, the tip sides overlap each other (overlap). becomes. At this time, the insulating coating W2 is wrapped and crimped so that the pair of barrel pieces 003 and 004 having substantially constant thicknesses t11 and t12 overlap each other. Therefore, the amount of compressive displacement of the insulation coating part W2 by the coating crimping part 002 becomes large, and the thickness becomes t13.

On the other hand, in the electric wire 100 with a terminal of the present embodiment, the thickness t1 of the outer barrel piece 44 of the pair of barrel pieces 44 and 45 constituting the covered crimping part 48 is such that the thickness t1 is from the base end 44b to the tip 44a. Although the thickness t2 of the inner barrel piece 45 is approximately constant, it becomes thinner from the base end 45b toward the distal end 45a. In the electric wire 100 with a terminal according to the present embodiment, the pair of barrel pieces 44 and 45 constituting the sheathing crimping part 48 are wound around the insulation sheathing part W2, crimped, and crimped, and the distal ends thereof overlap each other (overlap). ). At this time, the insulating coating W2 is wrapped and crimped so that the outer barrel piece 44 and the inner thin barrel piece 45 having a thickness t2 overlap. Therefore, the amount of compressive displacement of the insulation covering part W2 by the covering crimping part 48 is reduced, and the insulation covering part W2 has a thickness t3 that is thicker than the thickness t13 caused by the conventional covering crimping part 002. As a result, by reducing the load acting on the insulation coating part W2 from the insulation crimping part 48, damage to the insulation coating part W2 is suppressed, water is prevented from entering the inside, and corrosion of the crimp terminal 1 is suppressed. Ru.

As explained above, the electric wire 100 with a terminal according to the present embodiment includes the electric wire W that covers the conductor portion W1 with the insulation coating portion W2, the conductor crimping portion 46 that is crimped to the conductor portion W1, and the insulation coating portion W2. The crimp terminal 1 includes a cover crimp portion 48 that is crimp-bonded to the crimp terminal 1 . The covering crimping part 48 includes a base 41 extending along the axial direction 48 is crimped so that the base 41 and the pair of barrel pieces 44, 45 wrap around the entire circumference of the insulation coating W2 in the circumferential direction D1 so that the tips of the pair of barrel pieces 44, 45 overlap. Of the pair of barrel pieces 44 and 45, only the barrel piece 45 located on the inside during crimping becomes thinner toward the tip 45a in the circumferential direction D1.

According to the electric wire 100 with a terminal according to the present embodiment, the pair of barrel pieces 44 and 45 are wound around the insulating coating part W2 and crimped, and the distal ends thereof overlap with each other in an overlapping state. At this time, the insulating coating W2 is in a state where the other barrel piece 45, which has a tapered shape, is located inside the one barrel piece 44. Therefore, the amount of compressive displacement of the insulation coating part W2 by the coating crimping part 48 is reduced, and the applied load is reduced. As a result, damage to the insulation coating portion W2 is suppressed, and the durability of the coating crimping portion 48 can be improved.

Further, in the electric wire 100 with a terminal according to the present embodiment, among the pair of barrel pieces 44 and 45, the barrel piece 45 located inside at the time of crimping is a tip 45a in the circumferential direction D1 from the base end 45b connected to the base 41. The thickness becomes thinner toward , and the thickness of the distal end 45a is 1/3 to 1/2 of the thickness of the proximal end 45b. Therefore, the amount of compressive displacement of the insulation coating portion W2 by the coating crimping portion 48 can be effectively reduced.

[Reference example]
FIG. 6 is an exploded perspective view showing a schematic configuration of an electric wire with a terminal according to a reference example.

As shown in FIG. 6, the electric wire 100A with a terminal according to the reference example differs from the present embodiment in the structure of a part of the base 41 and a cover crimping part 48A formed by a pair of barrel pieces 44A and 45. In the following, components similar to those of the present embodiment described above are given the same reference numerals, and redundant explanations of common configurations, operations, and effects will be omitted as much as possible.

As shown in FIG. 6, the electric wire 100A with a terminal includes an electric wire W and a crimp terminal 1A which is crimped to the end of the electric wire W and is electrically connected. The crimp terminal 1A includes an electrical connection part 2, a connecting part 3, and a wire crimp part 4A. The wire crimping section 4A includes a base 41 and two pairs of barrel pieces 42, 43, 44A, and 45. The wire crimping portion 4A is crimped and crimped onto the wire W by the base 41 and the two pairs of barrel pieces 42, 43, 44A, and 45.

In the wire crimping section 4A, a conductor crimping section 46, an intermediate section 47, and a covering crimping section 48A are constituted by a base 41 and two pairs of barrel pieces 42, 43, 44, and 45. In other words, the wire crimping section 4A includes a base 41, a conductor crimping section 46 constituted by two pairs of barrel pieces 42, 43, 44, and 45, an intermediate section 47, and a covering crimping section 48A. Ru. The pair of barrel pieces 44A and 45 are parts that together with the third base 41c, which is a part of the base 41, constitute the covering crimping part 48A.

FIG. 7 is a sectional view showing the cover crimping portion of the crimp terminal before crimping.

As shown in FIGS. 1 and 7, the covering crimping portion 48A that is crimped onto the insulation covering portion W2 of the electric wire W includes a third base portion 41c of the base portion 41 and a pair of barrel pieces 44A and 45. The covering crimping portion 48A is crimped around the entire circumference in the circumferential direction D1 by the third base portion 41c and the pair of barrel pieces 44A, 45 so that the tips of the pair of barrel pieces 44A, 45 overlap. At this time, the thickness of the pair of barrel pieces 44A, 45 becomes thinner toward the tips in the circumferential direction D1.

To explain in detail, the barrel piece 44A has a proximal end 44b connected to the connecting portion 41d of the third base 41c, and a distal end 44a extending in a direction away from the third base 41c. The thickness of the barrel piece 44A decreases from the base end 44b toward the distal end 44a. It is preferable that the thickness of the distal end 44a of the barrel piece 44A is 1/3 to 1/2 of the thickness of the proximal end 44b. That is, the pair of barrel pieces 44A, 45 have substantially the same shape.

FIG. 8 is a sectional view showing the cover crimping portion of the crimp terminal after crimping.

As shown in FIG. 8, in the electric wire 100A with a terminal according to the reference example, the thickness t1 of the pair of barrel pieces 44A and 45 forming the cover crimping part 48A. t2 becomes thinner from the base ends 44b, 45b toward the tips 44a, 45a. In the electric wire 100A with a terminal of the reference example, the pair of barrel pieces 44A and 45 constituting the sheathing crimping part 48A are wrapped around the insulation sheathing part W2, crimped, and crimped, so that the tip sides overlap each other (overlapping). ) state. At this time, the insulating coating W2 is wrapped and crimped so that the thin barrel pieces 44 and 45 having thicknesses t1 and t2 overlap each other. Therefore, the amount of compressive displacement of the insulation coating part W2 by the coating crimping part 48A decreases, and the thickness becomes t3. As a result, damage to the insulation coating W2 is suppressed by reducing the load acting on the insulation coating W2 from the coating crimping portion 48A.

Note that the electric wire with a terminal according to the embodiment of the present invention described above is not limited to the embodiment described above, and various changes can be made within the scope of the claims.

The electric wire with a terminal according to the present embodiment may be constructed by appropriately combining the constituent elements of the embodiment and reference example described above.

1, 1A Crimp terminal 2 Electrical connection part 3 Connection part 4, 4A Wire crimping part 10 Corrosion protection 41 Base part 41a First base part 41b Second base part 41c Third base part 41d, 41e Connection part 42, 43, 44, 44A, 45 Barrel Pieces 42a, 43a, 44a, 45a Tips 44b, 45b Base ends 44c, 45c Inner surfaces 44d, 45d Outer surfaces 44e, 45e Chamfered portion 46 Conductor crimped portion 46a Indent 47 Intermediate portion 48, 48A Covered crimped portion 100, 100A Electric wire with terminal D1 Circumferential direction W Electric wire W1 Conductor portion W2 Insulating coating portion X Axial direction X1 Axis Y Width direction Z Height direction

Claims (2)

an electric wire that covers a conductor part that has conductivity with an insulating coating part that has insulation;
a crimp terminal including a conductor crimp portion that is crimp-bonded to the conductor portion exposed from an end of the insulation sheathing portion, and a covering crimp portion that is crimp-bonded to the insulation sheathing portion;
Equipped with
The covering crimping portion includes a base portion extending along the axial direction of the electric wire, and a pair of barrel pieces extending from the base portion to both sides in the circumferential direction along the axial direction,
The covering crimping part is crimped so that the base part and the pair of barrel pieces wrap around the entire circumference of the insulating covering part in the circumferential direction so that the tip ends of the pair of barrel pieces overlap,
Of the pair of barrel pieces, only the barrel piece located on the inside during crimping becomes thinner toward the tip in the circumferential direction.
Electric wire with terminal. Of the pair of barrel pieces, the barrel piece located on the inside during crimping becomes thinner from the proximal end connected to the base toward the tip in the circumferential direction, and the thickness of the tip is equal to The thickness is 1/3 to 1/2 of the thickness of the proximal end,
The electric wire with a terminal according to claim 1.

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