JP2021034300A - Wire harness - Google Patents

Abstract

To provide a wire harness that can suppress galvanic corrosion.SOLUTION: A wire harness 11 includes: an electric wire 12 that has a core wire 14 formed from a first metallic material and an insulating film 15 that covers the core wire 14; a terminal 13 that is formed from a second metallic material different from that of the core wire 14 and has a connecting portion 16 to which a side surface of a tip portion 14a of the core wire 14 is connected, which projects from the tip portion of the insulating film 15; and a step structure 21 as a stagnation suppressing structure that suppresses stagnation of a liquid over an apical surface 15a of the insulating film 15 and the tip portion 14a of the core wire 14.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to wire harnesses.

Conventionally, some wire harnesses have terminals connected to the tip of a core wire protruding from the tip of an insulating film. As such a wire harness, the core wire and the terminal are made of different types of metal, and the terminal is plated to suppress corrosion (see, for example, Patent Document 1). In such a wire harness, galvanic corrosion can be suppressed without using a heat shrink tube or the like.

Japanese Unexamined Patent Publication No. 2015-141784

Although the wire harness subjected to the corrosion suppression plating as described above is effective in suppressing galvanic corrosion, further suppression of galvanic corrosion is desired.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a wire harness capable of suppressing galvanic corrosion.

The wire harness of the present disclosure comprises an electric wire having a core wire made of a first metal material and an insulating film covering the core wire, and a second metal material of a type different from the core wire, and the tip portion of the insulating film. A wire harness provided with a terminal having a connecting portion to which a side surface of the tip portion of the core wire protruding from the wire is connected, and liquid stays over the tip surface of the insulating film and the tip portion of the core wire. It has a retention suppression structure that suppresses this.

According to the wire harness of the present disclosure, galvanic corrosion can be suppressed.

FIG. 1 is a side view of the wire harness according to the embodiment. FIG. 2 is a front view of the wire harness in one embodiment. FIG. 3 is a front view of the wire harness in another example. FIG. 4 is a front view of the wire harness in another example. FIG. 5 is a side view of the wire harness in another example. FIG. 6 is a side view of the wire harness in another example. FIG. 7 is a front view of the wire harness in another example. FIG. 8 is a side view of the wire harness in another example.

[Explanation of Embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.
The wire harness of the present disclosure is
[1] The electric wire having a core wire made of a first metal material and an insulating film covering the core wire, and a second metal material of a type different from the core wire, protruding from the tip of the insulating film. A wire harness provided with a terminal having a connection portion to which a side surface at the tip end portion of the core wire is connected, and suppresses liquid from staying over the tip surface of the insulating film and the tip end portion of the core wire. It has a retention suppression structure.

According to the same configuration, since the retention suppressing structure for suppressing the retention of the liquid over the tip surface of the insulating film and the tip portion of the core wire is provided, the retention of the liquid at the portion is suppressed. Therefore, galvanic corrosion can be suppressed.

[2] The terminal includes a holding portion having a film facing portion formed by connecting to the connecting portion and facing the insulating film, and a gripping piece extending from the film facing portion and holding the insulating film so as to wrap the insulating film. The retention suppressing structure preferably includes a stepped structure in which the film facing portion has a stepped portion with the connecting portion.

According to the same configuration, since the retention suppression structure includes a stepped structure in which the film facing portion of the terminal has a stepped portion with the connecting portion, it becomes difficult for a gap to be formed between the inner surface of the tip portion of the insulating film and the core wire, which in turn makes it difficult for a gap to occur. It is possible to prevent the liquid from staying over the tip surface of the insulating film and the tip of the core wire. That is, for example, in a configuration in which the film facing portion of the terminal does not have a step with the connecting portion, the core wire is largely bent toward the connecting portion at the time of connection, and the inner surface of the tip portion of the insulating film is bent by the bending force. There is a possibility that a gap may be formed between the core wire and the core wire, but the amount of bending of the core wire can be suppressed due to the step, and the occurrence of the gap can be suppressed. Therefore, it is possible to prevent the liquid from staying over the tip surface of the insulating film and the tip of the core wire.

[3] The terminal includes a holding portion having a film facing portion formed by connecting to the connecting portion and facing the insulating film, and a gripping piece extending from the film facing portion and holding the insulating film so as to wrap the insulating film. The retention suppressing structure is such that the film facing portion has the same plane as the connecting portion, and the inner surface of the tip portion of the insulating film and the core wire do not have a gap. It is preferable to include a crushing holding structure in which the electric wire is crushed and held by the gripping piece.

According to the same configuration, the retention suppression structure has a structure in which the film facing portion has the same plane as the connecting portion, and the electric wire is held by the gripping piece until a position where a gap does not occur between the inner surface of the tip portion of the insulating film and the core wire. Since it includes a crushing and holding structure for crushing and holding, it is possible to prevent liquid from staying over the tip surface of the insulating film and the tip of the core wire. That is, for example, in a configuration in which the film facing portion of the terminal has the same plane as the connecting portion, the core wire is connected while being greatly bent toward the connecting surface side, and the force at the time of bending causes the tip portion of the insulating film to be connected. There is a possibility that a gap may be generated between the inner surface and the core wire, but since the electric wire is crushed and held by the gripping piece to a position where the gap does not occur, the structure can be configured without a gap. Therefore, it is possible to prevent the liquid from staying over the tip surface of the insulating film and the tip of the core wire.

[4] The retention suppressing structure preferably includes a tapered surface formed on the tip surface of the insulating film.
According to the same configuration, since the retention suppression structure includes a tapered surface formed on the tip surface of the insulating film, even if the liquid is about to stay on the tip surface of the insulating film and the tip of the core wire, the tapered surface causes the liquid to stay. Is easy to flow down at an early stage, and the retention of liquid is suppressed.

[5] The retention suppressing structure preferably includes an uneven portion formed on the tip surface of the insulating film.
According to the same configuration, since the retention suppressing structure includes the uneven portion formed on the tip surface of the insulating film, the same plane on the tip surface on which the liquid can stay can be reduced. Therefore, the liquid tends to flow down at an early stage, and the retention of the liquid is suppressed.

[6] The terminal includes a holding portion having a film facing portion formed by connecting to the connecting portion and facing the insulating film, and a gripping piece extending from the film facing portion and holding the insulating film so as to wrap the insulating film. The retention suppressing structure preferably includes a bypass structure in which the connecting portion connecting the connecting portion and the film facing portion is bypassed so as to be separated from the tip surface of the insulating film.

According to the same configuration, the retention suppression structure includes a detour structure in which the connecting portion connecting the connecting portion and the film facing portion is bypassed so as to be separated from the tip surface of the insulating film. It is suppressed that the liquid stays over the surface and the tip of the core wire.

[7] The terminals are preferably plated to prevent corrosion.
According to the same configuration, since the terminals are subjected to corrosion suppression plating, galvanic corrosion can be further suppressed.

[Details of Embodiments of the present disclosure]
Specific examples of the wire harness of the present disclosure will be described below with reference to the drawings. It should be noted that the present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

As shown in FIGS. 1 and 2, the wire harness 11 includes an electric wire 12 and a terminal 13, and the tip end side of the terminal 13 is connected to a battery or the like (not shown) provided in an engine room of a vehicle.

The electric wire 12 has a core wire 14 and an insulating film 15 that covers the core wire 14. The core wire 14 is made of aluminum or an aluminum alloy as a first metal material. The core wire 14 of the present embodiment is a stranded wire composed of a plurality of strands. Note that in FIGS. 1 and 2, the boundaries and gaps between the strands are not shown.

The terminal 13 is made of a metal plate material of copper or a copper alloy as a second metal material of a type different from that of the core wire 14. The terminal 13 is nickel-plated as a corrosion-suppressing plating.
The terminal 13 includes a connecting portion 16 to which the core wire 14 of the electric wire 12 is connected, and a holding portion 18 provided from the connecting portion 16 via the connecting portion 17 and holding the electric wire 12.

The connecting portion 16 is formed in a flat plate shape, and one of the flat surfaces thereof is a connecting surface 16a connected to the core wire 14. The side surface of the core wire 14 protruding from the tip of the insulating film 15 at the tip 14a is connected to the connection surface 16a of the connection 16. The side surface of the tip portion 14a is a surface in a direction orthogonal to the extending direction of the core wire 14. Specifically, the tip portion 14a of the core wire 14 is connected and fixed to the connection surface 16a by ultrasonic welding while being crushed by being pressed against the connection surface 16a side by a jig (not shown) with its side surface mounted on the connection surface 16a. Has been done.

The holding portion 18 has a film facing portion 19 facing the insulating film 15 and a pair of gripping pieces 20 extending from the film facing portion 19 and holding the insulating film 15 so as to wrap the insulating film 15. The grip piece 20 is bent so as to wrap the insulating film 15 in a state where the tip portion 14a of the core wire 14 is connected to the connecting surface 16a of the connecting portion 16, and the electric wire 12 including the insulating film 15 is slightly moved to the film facing portion 19 side. Hold while crushing.

In the wire harness 11, the tip end side of the terminal 13 is connected to a battery or the like so that the tip end side in the extending direction of the core wire 14 faces the antigravity direction. The anti-gravity direction referred to here does not mean the anti-gravity direction in a strict sense, but is a direction having a width within a range in which the effect of the present embodiment is exhibited, such as an oblique anti-gravity direction.

The wire harness 11 has a film facing portion 19 having a step with the connecting portion 16 as a retention suppressing structure for suppressing the retention of liquid over the tip surface 15a of the insulating film 15 and the tip portion 14a of the core wire 14. The step structure 21 is provided.

Specifically, in the step structure 21 of the present embodiment, the connecting portion 17 connecting the connecting portion 16 and the film facing portion 19 is formed by bending in a direction away from the connecting surface 16a and the core wire 14, so that the connecting portion 17 and the film facing portion 19 are formed. The structure is such that the connecting portion 16 has a step. In other words, the contact surface 19a of the film facing portion 19 with the insulating film 15 is formed at a position far from the core wire 14 with respect to the connecting surface 16a and at a position on the left side in FIG. Then, the tip portion 14a of the core wire 14 is connected to the connecting surface 16a while being bent to the left side in FIG. 1 on the connecting portion 16 side by the above-mentioned ultrasonic welding. The amount of bending of the core wire 14 can be suppressed. By suppressing the amount of bending of the core wire 14, it is possible to prevent a gap from being formed between the inner surface of the tip end portion of the insulating film 15 and the core wire 14, and by extension, the tip surface 15a of the insulating film 15 and the core wire 14 are suppressed. The structure is such that the liquid is suppressed from staying over the tip portion 14a of the cable.

Further, the tip portion 14a of the core wire 14 is provided with an inclined surface 14c and a groove 14d as a retention suppressing portion for suppressing the retention of liquid over the tip surface 14b of the core wire 14 and the connection surface 16a of the connection portion 16. There is.

The inclined surface 14c is provided on the tip surface 14b of the core wire 14. The inclined surface 14c of the present embodiment is formed so as to be inclined so that the entire tip surface 14b of the core wire 14 becomes farther from the connecting surface 16a toward the base end side of the core wire 14. The inclined surface 14c may be formed by crushing the corresponding portion or by cutting.

The groove 14d is formed by being recessed in the outer surface of the tip end portion 14a of the core wire 14 and opposite to the connecting surface 16a and extending from the tip end surface 14b of the core wire 14. The groove 14d of the present embodiment is formed in the direction in which the core wire 14 extends and is inclined with respect to the vertical direction in FIG. Specifically, as shown in FIG. 2, the groove 14d of the present embodiment extends in both directions from the center of the tip surface 14b of the core wire 14 in the width direction with respect to the extending direction of the core wire 14, and the tip portion of the core wire 14 extends. It is formed in a mesh shape including a pair of grooves formed up to the widthwise end portion in 14a. The groove 14d may be formed by crushing the corresponding portion or by cutting.

Next, the operation of the wire harness 11 configured as described above will be described.
For example, when water is splashed on the wire harness 11 arranged in the engine room during rainfall or the like, the water flows down early due to the action of the inclined surface 14c and is guided to the groove 14d and flows down early. Therefore, it is possible to prevent the core wire 14 from staying over the tip surface 14b and the connection surface 16a of the connection portion 16. Therefore, galvanic corrosion at the corresponding site can be suppressed.

Further, water is prevented from forming a gap between the inner surface of the tip end portion of the insulating film 15 and the core wire 14 by the step structure 21, so that the tip surface 15a of the insulating film 15 and the tip end portion of the core wire 14 are suppressed. Retention over 14a is suppressed. Therefore, galvanic corrosion at the corresponding site can be suppressed.

Next, the effects of the above embodiment will be described below.
(1) Since the step structure 21 as a retention suppressing structure for suppressing the retention of the liquid over the tip surface 15a of the insulating film 15 and the tip portion 14a of the core wire 14 is provided, the liquid stays in the portion. Is suppressed. Therefore, galvanic corrosion can be suppressed.

(2) Since the retention suppression structure includes a stepped structure 21 in which the film facing portion 19 has a step with the connecting portion 16, a gap is less likely to occur between the inner surface of the tip end portion of the insulating film 15 and the core wire 14, and thus a gap is less likely to occur. It is possible to prevent the liquid from staying over the tip surface 15a of the insulating film 15 and the tip 14a of the core wire 14. That is, for example, in a configuration in which the film facing portion 19 of the terminal 13 does not have a step with the connecting portion 16, the core wire 14 is greatly bent toward the connecting portion 16 during ultrasonic welding, and the bending force causes the core wire 14 to be significantly bent. There is a possibility that a gap may be formed in Z between the inner surface of the tip end portion of the insulating film 15 and the core wire 14. On the other hand, in the above embodiment, the amount of bending of the core wire 14 due to the step and the force of pulling the core wire 14 toward the connection portion 16 can be suppressed, and by extension, the inner surface of the tip portion of the insulating film 15 and the core wire 14 It is possible to suppress the occurrence of a gap between Z. Therefore, it is possible to prevent the liquid from staying over the tip surface 15a of the insulating film 15 and the tip 14a of the core wire 14.

(3) Since the terminal 13 is nickel-plated, galvanic corrosion can be further suppressed.
(4) The tip portion 14a of the core wire 14 includes an inclined surface 14c and a groove 14d as a retention suppressing portion for suppressing the retention of liquid over the tip surface 14b of the core wire 14 and the connection surface 16a of the connection portion 16. Therefore, it is possible to prevent the liquid from staying at the site. Therefore, galvanic corrosion can be suppressed.

(5) Since the retention suppressing portion includes the inclined surface 14c provided on the tip surface 14b of the core wire 14, the retention suppressing portion is inclined even if the liquid is about to accumulate over the tip surface 14b of the core wire 14 and the connection surface 16a of the connection portion 16. The surface 14c facilitates the liquid to flow down at an early stage and suppresses the retention of the liquid.

(6) Since the retention suppressing portion includes a groove 14d recessed in the outer surface of the tip portion 14a of the core wire 14 and extending from the tip surface 14b of the core wire 14, the tip surface 14b of the core wire 14 and the connecting surface 16a of the connecting portion 16 Even if the liquid is about to stay, it is guided to the groove 14d and the liquid easily flows down at an early stage, and the retention of the liquid is suppressed.

(7) Since the groove 14d is inclined with respect to the extending direction of the core wire 14, the liquid easily flows down to the outside in the width direction of the core wire 14.
This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

In the above embodiment, the tip portion 14a of the core wire 14 is provided with an inclined surface 14c and a groove 14d as a retention suppressing portion, but the liquid spreads over the tip surface 14b of the core wire 14 and the connecting surface 16a of the connecting portion 16. If it is possible to suppress the retention, the configuration may be changed to another configuration.

For example, as shown in FIG. 3, the tip portion 14a of the core wire 14 may have an inclined surface 14c as a retention suppressing portion and may not have the groove 14d of the above embodiment. Further, the shape of the inclined surface 14c may be changed to another shape, for example, it may be formed only on a part of the tip surface 14b of the core wire 14.

Further, for example, as shown in FIG. 4, the tip portion 14a of the core wire 14 may have a groove 14d as a retention suppressing portion and may not have the inclined surface 14c of the above embodiment. Further, the shape of the groove 14d may be changed to another shape, for example, a shape extending along the extending direction of the core wire 14.

Further, the configuration may not include a retention suppression unit.
-In the above embodiment, the step structure 21 is provided as the retention suppressing structure, but if it is possible to suppress the retention of the liquid over the tip surface 15a of the insulating film 15 and the tip 14a of the core wire 14, it is possible to prevent the liquid from staying. It may be changed to another configuration.

For example, as shown in FIG. 5, the retention suppression structure has a structure in which the film facing portion 19 has the same plane as the connecting portion 16, but a gap is formed between the inner surface of the tip end portion of the insulating film 15 and the core wire 14. The crush holding structure 22 may be changed to crush and hold the electric wire 12 with the gripping piece 20 to a position where there is no grip. That is, in this example, the connecting portion 17 connecting the connecting portion 16 and the film facing portion 19 is formed without bending, and the connecting surface 16a of the connecting portion 16 and the contact surface 19a of the film facing portion 19 are formed on the same plane. Has been done. In this example, since the step structure 21 is not provided, between the inner surface of the tip portion of the insulating film 15 and the core wire 14 due to the force when the tip portion 14a of the core wire 14 is significantly bent toward the connection portion 16 side during ultrasonic welding. Although a gap is formed in Z, the gripping piece 20 holds the electric wire 12 so as to crush the electric wire 12 to a position where no gap is formed between the inner surface of the tip end portion of the insulating film 15 and the core wire 14. Even in this way, it is possible to prevent the liquid from staying over the tip surface 15a of the insulating film 15 and the tip 14a of the core wire 14.

Further, for example, as shown in FIG. 6, the retention suppression structure may include a tapered surface 15b formed on the tip surface 15a of the insulating film 15. The tapered surface 15b of this example is formed at a portion of the film facing portion 19 opposite to the contact surface 19a, and the entire tip surface 15a of the insulating film 15 is directed from the contact surface 19a toward the proximal end side of the insulating film 15. It is formed so as to move away. In this way, even if the liquid is about to stay over the tip surface 15a of the insulating film 15 and the tip 14a of the core wire 14, the tapered surface 15b makes it easy for the liquid to flow down at an early stage and suppresses the retention of the liquid.

Further, for example, as shown in FIG. 7, the retention suppression structure may include the uneven portion 15c formed on the tip surface 15a of the insulating film 15. The uneven portion 15c of this example is formed with a convex portion 15d protruding toward the tip end at a central portion in the width direction at a portion of the film facing portion 19 opposite to the contact surface 19a. In this way, the coplanar surface on the tip surface 15a where the liquid can stay can be reduced. Therefore, the liquid tends to flow down at an early stage, and the retention of the liquid is suppressed.

Further, for example, as shown in FIG. 8, the retention suppression structure is a detour structure 23 in which the connecting portion 17 connecting the connecting portion 16 and the film facing portion 19 is bypassed so as to be separated from the tip surface 15a of the insulating film 15. May be included. The bypass structure 23 of this example is formed by bending the connecting portion 17 so as to be separated from the tip surface 15a of the insulating film 15. In this way, it is possible to prevent the liquid from staying in the connecting portion 17, the tip surface 15a of the insulating film 15, and the tip portion 14a of the core wire 14.

-In the above embodiment, the terminal 13 is nickel-plated, but may be plated with other corrosion-suppressing plating, or may not be plated with corrosion-suppressing plating.

-In the above embodiment, the tip portion 14a of the core wire 14 is connected to the connecting surface 16a of the connecting portion 16 by ultrasonic welding, but the present invention is not limited to this, and the tip portion 14a may be connected by other welding or the like. Good.

-In the above embodiment, the core wire 14 is made of aluminum or an aluminum alloy as the first metal material, but it may be made of another first metal material. Further, although the terminal 13 is made of copper or a copper alloy as the second metal material, it may be made of another second metal material of a type different from that of the first metal material.

11 Wire harness 12 Electric wire 13 Terminal 14 Core wire 14a Tip 14b Tip surface 14c Inclined surface (retention suppression section)
14d groove (retention suppression part)
15 Insulation film 15a Tip surface 15b Tapered surface (retention suppression structure)
15c Concavo-convex part (retention suppression structure)
15d Convex part 16 Connection part 16a Connection surface 17 Connection part 18 Holding part 19 Film facing part 19a Contact surface 20 Gripping piece 21 Step structure (retention suppression structure)
22 Crush holding structure (retention suppression structure)
23 Detour structure (retention suppression structure)
Between Z

Claims (7)

An electric wire having a core wire made of a first metal material and an insulating film covering the core wire,
A wire harness made of a second metal material of a type different from that of the core wire, and provided with a terminal having a connecting portion to which a side surface of the tip portion of the core wire protruding from the tip end portion of the insulating film is connected. ,
A wire harness having a retention suppressing structure that suppresses the retention of liquid over the tip surface of the insulating film and the tip of the core wire. The terminal is provided with a holding portion having a film facing portion formed by connecting to the connecting portion and facing the insulating film, and a gripping piece extending from the film facing portion and holding the insulating film so as to wrap the insulating film. There,
The wire harness according to claim 1, wherein the retention suppressing structure includes a stepped structure in which the film facing portion has a stepped portion with the connecting portion. The terminal is provided with a holding portion having a film facing portion formed by connecting to the connecting portion and facing the insulating film, and a gripping piece extending from the film facing portion and holding the insulating film so as to wrap the insulating film. There,
The retention suppression structure is such that the film facing portion has the same plane as the connection portion, and the electric wire is held by the gripping piece until a position where a gap is not formed between the inner surface of the tip end portion of the insulating film and the core wire. The wire harness according to claim 1, further comprising a crush holding structure for crushing and holding. The wire harness according to any one of claims 1 to 3, wherein the retention suppressing structure includes a tapered surface formed on the tip surface of the insulating film. The wire harness according to any one of claims 1 to 4, wherein the retention suppressing structure includes an uneven portion formed on the tip surface of the insulating film. The terminal is provided with a holding portion having a film facing portion formed by connecting to the connecting portion and facing the insulating film, and a gripping piece extending from the film facing portion and holding the insulating film so as to wrap the insulating film. There,
Any one of claims 1 to 5, wherein the retention suppression structure includes a bypass structure in which the connecting portion connecting the connecting portion and the film facing portion is bypassed so as to be separated from the tip surface of the insulating film. The wire harness described in the section. The wire harness according to any one of claims 1 to 6, wherein the terminal is plated to prevent corrosion.