JP2021182491A - Wire with terminal - Google Patents

Abstract

To improve the anti-corrosive performance of a wire with a terminal.SOLUTION: A wire with a terminal has: a wire 10 provided with a core wire 11 composed of a plurality of strands 13 and a coat 12 that covers the wire terminal except a core wire exposed portion 11a; a terminal fitting 20 mounted to the wire terminal; and a cut-off member 30 composed of curable resin material. The terminal fitting has: a core wire connector 22 physically and electrically connected to the core wire exposed portion; a coat connector 23 crimped to a coat terminal part 12; and a joint 24 that joins the core wire connector to the coat connector with a space therebetween, and exposes the core wire exposed portion from between them. The cut-off member has: an inward cut-off part 31 that is formed in a gap G between the strands of the core wire at least from the position of the joint to the rear end position of the coat connector and blocks the flow of liquid into the gap; and an outward cut-off part 32 that covers the core wire exposed portion together with the core wire connector and the coat connector from outside, and inhibits the attachment of liquid to the core wire exposed portion from outside.SELECTED DRAWING: Figure 3

Description

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

Conventionally, some electric wires with terminals are provided with anticorrosion treatment on the terminal of the electric wire (hereinafter referred to as "electric wire terminal") and the electric wire connecting body of the terminal fitting crimped to the electric wire terminal. For example, the following Patent Documents 1 and 2 disclose a terminal-attached electric wire in which an electric wire terminal and an electric wire connection body of a terminal fitting are covered with a first resin, and the first resin is further covered with a second resin. Further, the following Patent Documents 3 and 4 describe electric wires with terminals in which the first resin is applied to the exposed core wire portion of the electric wire terminal so that the first resin is infiltrated into the gap between the strands of the exposed core wire portion. It has been disclosed. In the electric wire with a terminal of Patent Document 3, the electric wire terminal and the electric wire connecting body of the terminal fitting are covered with the second resin together with the first resin. In the electric wire with a terminal of Patent Document 4, the electric wire terminal and the electric wire connection body of the terminal fitting are covered with the first resin, and the tip end side of the exposed core wire portion of the first resin is covered with the second resin. The first resin and the second resin are curable resin materials having viscosity and curing under predetermined conditions.

Japanese Unexamined Patent Publication No. 2011-238500 Japanese Unexamined Patent Publication No. 2014-120283 Japanese Unexamined Patent Publication No. 2016-181367 Japanese Unexamined Patent Publication No. 2019-129068

In such a wire with a terminal, it goes without saying that the first resin and the second resin are surely formed, and the range in which the first resin and the second resin are formed is used to enhance the anticorrosion performance. It will be important. There is room for improvement in the conventional electric wire with a terminal.

Therefore, an object of the present invention is to provide an electric wire with a terminal capable of improving anticorrosion performance.

In order to achieve the above object, the present invention comprises a core wire composed of a plurality of strands, a wire having a coating covering other than the exposed core wire portion of the wire terminal, and a terminal fitting attached to the wire terminal. A water-stopping member made of a curable resin material, and the terminal fitting includes a core wire connector that is physically and electrically connected to the exposed core wire portion, and a coated terminal of the coating in the electric wire terminal. The coated connection body that is crimped and crimped to the portion, the core wire connection body and the coating connection body are connected at intervals, and the core wire exposed portion is formed between the core wire connection body and the coating connection body. The water-stopping member has a connecting body to be exposed, and the water blocking member is an element of the core wire from at least the position of the connecting body to the rear end position on the opposite side to the tip position on the connecting body side in the coated connecting body. The inner water blocking portion formed in the gap between the wires and suppressing the inflow of liquid into the gap and the exposed core wire portion are covered from the outside together with the core wire connecting body and the covering connecting body to the exposed core wire portion. It is characterized by having an outer water stop portion that suppresses the adhesion of liquid from the outside.

Here, it is desirable that the hardness of the inner water stop portion is lower toward the rear end position from the tip position in the coated connection body.

Further, it is desirable that the wire and the terminal fitting are made of metal materials having different ionization tendencies.

In the electric wire with a terminal according to the present invention, in the core wire of the electric wire terminal, not only the exposed core wire portion but also the water blocking member is provided so as to fill the gap between the strands inside the coated terminal portion and to the rear end position of the coated connection body. It is formed. Therefore, this electric wire with a terminal can improve the anticorrosion performance of the connection portion between the electric wire and the terminal fitting.

FIG. 1 is an exploded perspective view showing an electric wire with a terminal (excluding a water blocking member) of the embodiment. FIG. 2 is a plan view showing an electric wire with a terminal according to an embodiment. FIG. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 4 is an explanatory diagram showing an electric wire having a cross section of the YY line of FIG.

Hereinafter, embodiments of the electric wire with terminals according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

[Embodiment]
One of the embodiments of the electric wire with a terminal according to the present invention will be described with reference to FIGS. 1 to 4.

Reference numeral 1 in FIGS. 1 to 3 indicates an electric wire with a terminal according to this embodiment. The terminal-attached electric wire 1 includes an electric wire 10 physically and electrically connected to each other and a terminal fitting 20. Further, the electric wire 1 with a terminal is provided with a water blocking member 30 in order to enhance the anticorrosion performance of the connection portion between the electric wire 10 and the terminal fitting 20 (FIGS. 2 and 3).

The electric wire 10 includes a core wire 11 and a coating 12 for covering the core wire 11. At the electric wire terminal thereof, the coating wire 12 is stripped off to expose the core wire 11 (FIGS. 1 to 3). The core wire 11 is formed by bundling a plurality of strands 13 made of a conductive metal wire. The coating 12 is formed of an insulating resin material that covers other than the exposed core wire portion 11a of the core wire 11 in the electric wire terminal. In the electric wire 1 with a terminal of the present embodiment, the terminal metal fitting 20 is attached to the electric wire terminal.

The terminal fitting 20 is formed of a conductive material such as metal. The terminal fitting 20 is formed into a predetermined shape by, for example, press molding such as bending or cutting on a metal plate as a base material.

The terminal fitting 20 has a terminal connecting body 21 that is physically and electrically connected to a terminal connecting body (not shown) of the other terminal fitting (FIGS. 1 to 3). For example, one of the terminal connection body 21 of the terminal fitting 20 and the terminal connection body of the other terminal fitting are formed in the shape of a female terminal and the other of them is formed in the shape of a male terminal, and are inserted and fitted to each other. Can be combined.

Further, the terminal fitting 20 has a coating that is physically and electrically connected to the core wire exposed portion 11a and a coating that is physically connected to the covering terminal portion 12a of the coating 12 in the electric wire terminal. A connecting body 24 that connects the connecting body 23, the core wire connecting body 22 and the covering connecting body 23 at intervals, and exposes the core wire exposed portion 11a from between the core wire connecting body 22 and the covering connecting body 23. Have (FIGS. 1 to 3).

The core wire connecting body 22 shown here is physically crimped to the exposed core wire portion 11a by crimping and crimping the two barrel piece portions 22A (FIG. 1) connected to the bottom portion by winding them around the exposed core wire portion 11a. Connect physically and electrically. The core wire connecting body 22 after crimping and crimping shown here has the tip of the core wire exposed portion 11a protruding toward the terminal connecting body 21 side from the tip of the terminal connecting body 21 side (FIGS. 2 and 3).

The coated connecting body 23 shown here is physically crimped to the coated terminal portion 12a by crimping and crimping the two barrel piece portions 23A (FIG. 1) connected to the bottom thereof by winding them around the coated terminal portion 12a. To connect. The coated connecting body 23 after crimping and crimping shown here has the tip of the coated terminal portion 12a protruding toward the connecting body 24 side from the tip 23a on the connecting body 24 side (FIGS. 2 and 3).

The connecting body 24 shown here mainly connects the bottom of the core wire connecting body 22 and the bottom of the covering connecting body 23, and is a barrel piece of the core wire connecting body 22 and the covering connecting body 23 after crimping and crimping. The exposed core wire portion 11a is exposed between the portions 22A and 23A (FIGS. 2 and 3).

Here, the wire 13 of the core wire 11 and the terminal fitting 20 may be each molded of the same metal material, or may be molded of different metal materials. The strand 13 and the terminal fitting 20 shown here are made of metal materials having different ionization tendencies, and one of them has an ionization tendency larger than that of the other. In this example, the wire 13 is made of aluminum or an aluminum alloy, and the terminal fitting 20 is made of copper or a copper alloy having a lower ionization tendency than the wire 13.

The water stop member 30 is provided at least between the tip of the exposed core wire portion 11a and the rear end 23b of the covering connection body 23 in order to enhance the anticorrosion performance of the connection portion between the electric wire 10 and the terminal fitting 20 (FIG. 2 and FIG. Figure 3). The water blocking member 30 is molded by curing a viscous curable resin material. The water blocking member 30 is molded using two types of curable resin materials having different viscosities. Further, the water blocking member 30 is formed after the electric wire 10 and the terminal fitting 20 are connected by the above-mentioned crimping and crimping.

The water blocking member 30 is made of a low-viscosity first curable resin material that can penetrate into the gap G between the strands 13 of the core wire 11 and can be fixed in the gap G until it is cured. The inner waterproof portion 31 and the outer waterproof portion 32 formed of a second curable resin material that has a higher viscosity than the first curable resin material and can continue to cover the core wire exposed portion 11a until it is cured. And (FIGS. 2 and 3). The inner water stop portion 31 of FIGS. 2 and 3 is cross-hatched to represent the formed range for convenience of illustration. Further, the outer water stop portion 32 in the figure is a conceptual representation of this, and does not necessarily have the shape in the figure.

The inner water stop portion 31 is at least from the position of the connecting body 24 to the position of the rear end 23b (rear end position) opposite to the position (tip position) of the tip 23a on the connecting body 24 side in the covering connection body 23. It is formed in the gap G between the strands 13 of the core wire 11 between them (FIGS. 3 and 4). The inner water stop portion 31 is formed to suppress the inflow of liquid such as water or salt water into the gap G between the strands 13 between them. Further, the inner water blocking portion 31 is formed in a gap G between the strands 13 inside the core wire 11 and a gap G between the strands 13 on the outer peripheral surface side of the core wire 11.

Note that FIG. 4 shows an example of the inner water blocking portion 31 inside the coated connecting body 23. For example, in the coated terminal portion 12a, the inner peripheral surface side thereof may enter the gap G between the strands 13 on the outer peripheral surface side of the core wire 11 by the pressure from the coated connecting body 23, and fill the gap G. In the inner side of the coated connection body 23, when all the gaps G between the strands 13 on the outer peripheral surface side of the core wire 11 are filled with the coated terminal portion 12a, the inner side of the core wire 11 as shown in FIG. The inner water stop portion 31 is formed in the gap G between the strands 13 in the above. On the other hand, in the inner side of the coated connection 23, if all the gaps G or a part of the gaps G between the strands 13 on the outer peripheral surface side of the core wire 11 are not filled with the coated terminal portion 12a, the coated terminal portion thereof. An inward water blocking portion 31 is also formed in the gap G between the strands 13 not filled with 12a.

The first curable resin material forming the inner water blocking portion 31 is exposed to the core wire by applying it to the exposed portion (hereinafter referred to as “core wire exposed portion”) 11a _{1 from the connecting body 24 in the core wire exposed portion 11a.} part 11a is infiltrated into the gaps G between the _first wire 13, it is filled in the gap G between the periphery of the strand 13 of the gap G and the exposed core portions 11a ₁ between strands 13 of the exposed core portion 11a _1. At that time, the first curable resin material is _{filled at least in the gap G between the strands 13 of the core wire exposed portion 11a 1} and the gap G between the strands 13 of the core wire 11 inside the coated terminal portion 12a. Further, the first curable resin material, if the gap Gx (Fig. 3) is present between the coupling member 24 and the exposed core portions 11a _1, between the connecting member 24 and the exposed core portions 11a ₁ It is also filled in the gap Gx of.

For example, the first curable resin material is discharged from the first supply unit (not shown) of the resin supply device. By discharging the first curable resin material from the core wire exposed portion 11a ₁ toward the inside of the coated terminal portion 12a into the first supply portion, at least the gap G between the strands 13 of the _{core wire exposed portion 11a 1 is discharged.} The first curable resin material is filled in the gap G between the strands 13 of the core wire 11 and the inner side of the coated terminal portion 12a. In the resin supply device, the discharge amount and the discharge time of the first curable resin material are set so that the first curable resin material is filled in the respective gaps G and Gx. Further, in this resin supply device, the coating area of the first curable resin material is set so that the first curable resin material does not protrude out of the terminal fitting 20.

The outer water stop portion 32 is formed so as to cover the inner water _{stop portion 31 in the core wire exposed portion 11a 1} from the outside by covering the core wire exposed portion 11a together with the core wire connecting body 22 and the covering connecting body 23 from the outside. (Fig. 2 and Fig. 3). The outer water blocking portion 32 is formed in order to suppress the adhesion of the liquid from the outside to the core wire exposed portion 11a.

The second curable resin material forming the outer water blocking portion 32 is applied from the tip of the exposed core wire portion 11a to the tip end 23a of the coated connecting body 23 to form the coated connecting body 23 from the tip of the exposed core wire portion 11a. Cover the area up to the tip 23a from the outside. In that case, if the core wire exposed portion 11a ₁ side of the connecting body 24 is defined as the upper side, the core wire exposed portion 11a is within a range that does not allow the second curable resin material to squeeze out to the side of the terminal fitting 20. The second curable resin material is applied between the tip of the cover and the tip 23a of the coated connector 23.

For example, the second curable resin material is discharged from the second supply unit (not shown) of the resin supply device. In the resin supply device, in order to apply the second curable resin material within the above range, the discharge amount, the discharge time, and the coating area of the second curable resin material are set.

In this example, the first curable resin material and the second curable resin material are described as if they are applied by a common resin supply device. However, the resin supply device may be prepared as a dedicated one for each of the first curable resin material and the second curable resin material.

Here, the water blocking member 30 may be applied with the second curable resin material after the applied first curable resin material is cured, and the second curable resin material may be cured. After applying the curable resin material and the second curable resin material, the first curable resin material and the second curable resin material may be cured together. The water-stopping member 30 shown here is formed by curing the applied first curable resin material and the second curable resin material together.

The curable resin material forming the water-stopping member 30 is a viscous ultraviolet curable resin material that is cured by irradiation with ultraviolet rays, or is a viscous one-component thermosetting resin material. Those that cure by heating are used. As the water blocking member 30 shown here, an ultraviolet curable resin material is used as the first curable resin material and the second curable resin material. Therefore, in this example, after applying the first curable resin material and the second curable resin material, the ultraviolet irradiation device (not shown) is operated to irradiate the first curable resin material with ultraviolet rays from the outside. The first curable resin material and the second curable resin material are cured to form an inner waterproof portion 31 made of the first curable resin material and an outer waterproof portion 32 made of the second curable resin material. do.

Here, the inner water stop portion 31 and the outer water stop portion 32 are each molded of a curable resin material having a different viscosity, but when viewed as a water stop member 30, each is transparent or translucent. If there is, it is difficult to identify the boundary. Therefore, in the water-stopping member 30, for example, a coloring agent is added to the first curable resin material forming the inner water-stopping portion 31, and the second curable resin material forming the outer water-stopping portion 32 is used. It may be left transparent or translucent so that the boundary between the inner water stop portion 31 and the outer water stop portion 32 can be distinguished. As a result, in the electric wire 1 with terminals, it is possible to visually determine whether or not the inner water stop portion 31 exists in the outer water stop portion 32.

By the way, although it depends on the illuminance and the irradiation direction, it is difficult for the ultraviolet rays to reach the rear end position of the covering connector 23. Therefore, the hardness of the inner water stop portion 31 decreases from the front end position to the rear end position in the coated connecting body 23. For example, the inner water blocking portion 31 cannot be completely cured while maintaining its viscosity, even if the viscosity of the inner water blocking portion 31 is higher than that of the first curable resin material at the time of coating toward the rear end position of the coated connecting body 23. It may remain in. Therefore, even if the applied first curable resin material is filled outside the rear end position of the coated connecting body 23, the inward water blocking portion 31 is formed in a portion that protrudes to the outside. It can be made viscous. Therefore, in the electric wire 1 with a terminal, the inner water blocking portion 31 of the portion protruding to the outside does not have to affect the flexibility of the electric wire 10.

As shown above, in the electric wire 1 with a terminal of the present embodiment, in the core wire 11 of the electric wire terminal, not only the core wire exposed portion 11a but also the wire inside the coated terminal portion 12a and to the rear end position of the coated connecting body 23. The water blocking member 30 is formed so as to fill the gap G between the 13s. Therefore, the electric wire 1 with a terminal can improve the anticorrosion performance of the connection portion between the electric wire 10 and the terminal fitting 20.

For example, in the electric wire 1 with a terminal shown here, the wire 13 and the terminal metal fitting 20 are made of different metals, but due to the presence of the water blocking member 30, even if the electric wire terminal is immersed in a liquid, the wire terminal 1 can be used. It is possible to suppress the occurrence of so-called galvanic corrosion between the wire 13 and the terminal fitting 20.

Further, in the electric wire 1 with a terminal, the terminal metal fitting 20 is housed in a cavity (not shown) of a connector (non-waterproof connector) having no waterproof function, and the electric wire terminal opposite to the terminal metal fitting 20 has an anticorrosion function. Terminal fittings (not shown) that do not have may be accommodated in the cavity (not shown) of a connector (waterproof connector) having a waterproof mechanism. In the electric wire 1 with terminals, the non-waterproof connector side may be arranged inside the vehicle interior, and the waterproof connector side may be arranged outside the vehicle interior. In this case, in the electric wire 1 with terminals, even if a negative pressure is generated inside the coating 12 due to the temperature difference between the inside and outside of the vehicle interior, the liquid is discharged from the outside to the core wire exposed portion 11a due to the presence of the water blocking member 30. Since it is not sucked in, the anticorrosion performance of the connection portion between the electric wire 10 and the terminal fitting 20 can be maintained.

Further, the electric wire 1 with a terminal can improve the anticorrosion performance of the connection portion between the electric wire 10 and the terminal metal fitting 20 without causing the water blocking member 30 to protrude to the side of the terminal metal fitting 20. .. That is, the electric wire 1 with a terminal can improve the anticorrosion performance of the connection portion between the electric wire 10 and the terminal metal fitting 20 without obstructing the insertion of the terminal metal fitting 20 into the cavity (not shown) of the connector or the like. can.

Further, the electric wire 1 with a terminal can maintain the flexibility of the electric wire 10 immediately after being pulled out from the terminal metal fitting 20 while improving the anticorrosion performance of the connection portion between the electric wire 10 and the terminal metal fitting 20. Therefore, since the electric wire 1 with a terminal can improve the durability of the water blocking member 30, it is possible to maintain the anticorrosion performance of the connection portion between the electric wire 10 and the terminal fitting 20.

1 Wire with terminal 10 Wire 11 Core wire 11a Core wire exposed part 12 Covered 12a Covered terminal part 13 Wire 20 Terminal metal fittings 22 Core wire connection body 23 Covered connection body 23a Tip 23b Rear end 24 Connection body 30 Water stop member 31 Inner water stop 32 External water stop G Gap

Claims (3)

A core wire composed of a plurality of strands and an electric wire having a coating covering other than the exposed core wire portion of the core wire in the electric wire terminal, and an electric wire.
With the terminal fitting attached to the electric wire terminal,
A waterproof member made of a curable resin material and
Equipped with
The terminal fitting includes a core wire connecting body that is physically and electrically connected to the exposed core wire portion, a coated connecting body that is crimped and crimped to the coated terminal portion of the coating in the electric wire terminal, and the above. It has a connecting body that connects the core wire connecting body and the coated connecting body at a space, and exposes the exposed core wire portion from between the core wire connecting body and the covering connecting body.
The water-stopping member is formed in a gap between the strands of the core wire from at least the position of the connecting body to the rear end position on the opposite side to the tip position on the connecting body side in the coated connecting body. The inner water blocking part that suppresses the inflow of liquid to the core wire and the exposed core wire portion are covered from the outside together with the core wire connecting body and the covering connecting body, and the outer side that suppresses the adhesion of liquid from the outside to the exposed core wire portion. An electric wire with a terminal characterized by having a water stop. The electric wire with a terminal according to claim 1, wherein the inner water stop portion has a hardness lower toward the rear end position from the tip position in the coated connection body. The electric wire with a terminal according to claim 1 or 2, wherein the wire and the terminal fitting are made of a metal material having different ionization tendencies.

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