JP2013013262A - Filter, electric wire including filter, and manufacturing method of electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter which is attached to an electric wire even after a connector, a terminal, and the like are connected to the electric wire to ensure the ventilation into the electric wire and thereby preventing water from being taken into the electric wire.SOLUTION: A filter 1 is attached to an electric wire 3 led out from a rear end 10B and includes housings 11, 20 housing a core wire exposure part 30 where a core wire of the electric wire 3 is exposed; and a filter body 17 held by the housings 11, 20 and ensuring the ventilation into the housings 11, 20. It is preferable that the filter body 17 has water repellency, and the filter body 17 is held in the housings 11, 20 or at front ends of the housings 11, 20.

Description

  The present invention relates to a filter that prevents water from entering a connector through an electric wire due to a change in internal pressure, an electric wire including the filter, and a manufacturing method thereof.

  Generally, a waterproof connector having a sealed structure is used for connecting wires in places where there is a risk of getting wet, such as various vehicles (including electric vehicles and two-wheeled vehicles). In such a waterproof connector, a change in internal pressure may occur due to a temperature change according to the operating state. Even when the connector does not have a hermetically sealed structure, an internal pressure change may occur in the connector due to an internal pressure change caused by traveling.

  The tip of the electric wire connected to such a connector may be provided in a flooded area where water is splashed. In this case, when an internal pressure change occurs in the connector, water taken in from the tip of the electric wire may reach the connector through the electric wire, causing a problem in the circuit in the connector or other electronic equipment. In order to prevent this, the core wire is exposed by stripping the covering material at the middle part of the electric wire, and the internal pressure change generated in the connector due to the intake of outside air from the core wire exposed part is prevented from being transmitted to the tip rather than the core wire exposed part. A water stop structure of an electric wire is shown in Patent Document 1.

  Patent Document 1 discloses that a moisture-permeable covering material having air permeability and waterproofness is provided in the core wire exposed portion. Thereby, the waterproof property of the core wire exposed part is ensured, taking outside air into the inside of the electric wire from the core wire exposed part. FIG. 6 of Patent Document 1 discloses a filter having a housing that is simple in structure and easy to dispose on the electric wire for disposing the moisture-permeable covering material on the electric wire. This filter has a structure in which an opening formed in an outer peripheral wall thereof is covered with a moisture-permeable covering material using a rubber cylindrical housing through which an electric wire passes.

JP 2006-202571 A

  The filter of the above-mentioned cited document 1 is premised on providing in the intermediate part of the electric wire connected to the connector. An intermediate part here means the arbitrary parts between the rear end connected to a connector, and a front-end | tip. As shown in the cited document 1, for example, a ground terminal is connected to the front end of the electric wire, and the rear end is connected to the connector. Thus, after both ends of the electric wire are connected to the terminal and the connector, the terminal and the connector are obstructed, so that the type of filter in which the electric wire penetrates the housing as in the cited document 1 cannot be provided on the electric wire. Therefore, in order to provide this type of filter on an electric wire, at least one end needs to be in an open state where it is not connected to a connector or terminals. However, for example, when a wiring work for routing an electric wire in a narrow space is required, the filter may interfere with the wiring work. That is, it is necessary to attach the filter to the electric wires after completing the wiring of the electric wires connected to the connectors and terminals. However, since the filter of the type of the cited document 1 cannot cope with this, there is a restriction on a wiring procedure including connection of electric wires.

The present invention has been made on the basis of such a technical problem, and even after connecting connectors and terminals to the electric wire, water is taken into the electric wire by securing the ventilation into the electric wire by providing the electric wire. An object of the present invention is to provide a filter that can prevent the above-described problem.
By applying such a filter, the present invention secures the flexibility of the wiring procedure and prevents water from entering the connector through the wire even when the internal pressure changes in the connected connector. It aims at providing the electric wire which can be performed.
Another object of the present invention is to provide a method for easily manufacturing an electric wire including the filter of the present invention.

If the filter is attached to the tip of the electric wire, it is not necessary to penetrate the electric wire unlike the filter of the type of the cited document 1. However, if, for example, a ground terminal is connected to the tip of the electric wire, a filter cannot be attached to the tip. However, if the core wire exposed portion is provided at an arbitrary position in the middle portion of the electric wire and folded back, the folded portion apparently constitutes the end portion of the electric wire. If it does so, an electric wire will be pulled out only from one end, ie, the type of filter which an electric wire does not penetrate will be realized.
The filter of the present invention made there includes a housing and a filter body. The housing is attached to an electric wire drawn from the rear end of the housing, and accommodates a core wire exposed portion where the core wire of the electric wire is exposed. Further, the filter body is held by the housing and ensures ventilation into the housing.
The filter of the present invention can be attached regardless of the position in the electric wire and does not need to penetrate the electric wire. Therefore, the filter can be attached to the electric wire even after the connectors and terminals are connected to both ends of the electric wire, so that there is no restriction on the wiring work procedure.
The filter of the present invention is not limited to an apparent end formed by folding an electric wire. For example, when one end is connected to the connector and the other end is open, it goes without saying that the filter of the present invention can be attached to the tip of the open electric wire.
In addition, about the front and back of the filter of this invention, the side from which an electric wire is drawn out is defined as rear, and the opposite side is defined as front.

  In the filter of the present invention, the filter body preferably has water repellency. If water adheres to the filter main body, the water adhering portion may impair the air permeability. However, by providing water repellency, water adhesion is avoided and air permeability is more reliably ensured.

  In the present invention, a through-hole penetrating from the rear end to the front end opposite to the rear end is formed in the housing, and the filter main body can be held inside the housing or at the front end opposite to the rear end of the housing. In this embodiment, the filter main body may be held on the wall surface (inner peripheral surface of the housing) that forms the through hole using the through hole of the housing that functions as a ventilation path. This makes it possible to reduce the number of man-hours for manufacturing the filter in that a ventilation window is not required compared to, for example, forming a ventilation window on the wall of the housing and holding the filter main body on the housing so as to cover the ventilation window. The same applies to the case where the filter body is held at the front end of the housing.

The housing of the present invention is composed of two members, a first housing that holds the filter main body and a second housing that holds the electric wire, and the filter is attached to the electric wire by bringing the second housing into close contact with the electric wire. Can do.
The filter attached to the electric wire needs to be in close contact with the attachment portion to the electric wire in order to prevent water from entering the exposed portion of the core wire. Therefore, in order to obtain high adhesion, a portion (first part) that has a function of holding the filter body so that a material suitable for ensuring high adhesion can be selected for the portion that is in close contact with the electric wire. 1 housing) and a portion (second housing) having a function of being in close contact with the electric wire.

The present invention provides a wire having the above-described filter attached to an electric wire having a core wire exposed portion where the core wire is exposed and to which a filter accommodating the core wire exposed portion is attached.
By attaching the above filter to this electric wire, the degree of freedom in the wiring procedure is ensured, and even if the internal pressure changes in the connected connector, water can be prevented from entering the connector through the electric wire. .

In the electric wire of the present invention, it is preferable that a gap is formed between the filter main body and the tip of the core wire exposed portion inside the housing.
When the filter main body is in contact with the core wire exposed portion, the air permeability may be impaired due to the vent hole of the filter main body being blocked by the core wire. For this reason, external air can be reliably taken in between the core wires inside the electric wire via the filter body by forming a gap between the filter body and the core wire exposed portion.
This gap is unique to the filter from which the electric wire is drawn from the rear end side of the housing. That is, in the filter of the present invention, since no electric wire is drawn out from the front end side of the housing, a space (space) can be secured between the front end of the housing and the tip of the core wire exposed portion.

  As described above, the electric wire of the present invention can be attached with a filter at its tip, but cannot be attached when terminals are connected to the tip. Therefore, the core wire exposed portion provided in the middle portion of the electric wire is folded back, and the filter is attached to the electric wire so that the folded core wire exposed portion is accommodated in the housing. Thereby, even after connecting a connector and terminals to the both ends of an electric wire, a filter can be provided in the arbitrary positions of the middle part of an electric wire.

In the present invention, a hot melt adhesive that solidifies through melting by heating is interposed between the filter and the electric wire, and if the filter is bonded to the electric wire by heating, the electric wire of the present invention can be easily produced.
In this case, if the hot melt adhesive is provided integrally with the filter in advance, the electric wire of the present invention can be produced efficiently.

Even after the connector and terminals are connected to the electric wire, the filter of the present invention can be attached to the electric wire, thereby preventing water from being taken into the electric wire by ensuring the ventilation into the electric wire.
By applying such a filter, the present invention secures the flexibility of the wiring procedure and prevents water from entering the connector through the wire even when the internal pressure changes in the connected connector. Provide an electric wire that can be used.
The present invention also provides a method by which an electric wire comprising the filter of the present invention can be easily manufactured.

1 is an overall view of an electric wire provided with a filter according to an embodiment of the present invention. It is a perspective view of a filter (appearance). It is a perspective view of a filter (internal perspective). It is a longitudinal cross-sectional view of a filter. It is a schematic diagram for demonstrating the effect | action of this embodiment. It is a perspective view of a filter concerning a modification of the present invention. It is a perspective view of the filter concerning another modification of the present invention. It is a perspective view of the filter concerning another modification of the present invention.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIG. 1, the filter 10 of the present embodiment is provided at an arbitrary position in an intermediate portion (between the distal end portion 3 </ b> A and the proximal end portion 3 </ b> B of the electric wire 3) in the axial direction of the electric wire 3. The filter 10 has air permeability that allows passage of air toward the core wire exposed portion 30 accommodated therein, and has waterproofness that blocks passage of water. A base end portion 3B of the electric wire 3 is connected to a connector 41 provided in the device 4 mounted on the vehicle. The tip 3 </ b> A of the electric wire 3 is connected to the terminal 42. The terminal 42 may be used for grounding, or may be connected to another device (not shown).

As shown in FIGS. 2 to 4, the filter 10 includes a first housing 11 and a second housing 20 connected to the rear end side of the first housing 11, both of which are formed of a hollow cylindrical tube. Inside the first housing 11 and the second housing 20, the periphery of the rear end side of the first housing 11 is covered with the front end side of the second housing 20, thereby forming an air passage that communicates in the axial direction. The electric wire 3 is drawn from the rear end 10B side of the filter 10. In addition, in the filter 10 of this embodiment, the side from which the electric wire 3 is drawn is defined as the rear, and the opposite side is defined as the front. The filter 10 is provided with a filter main body 17 that realizes air permeability and waterproofness.
When the filter 10 is attached to the electric wire 3, the core wire exposed portion 30 (FIG. 3) provided in the middle portion of the electric wire 3 is accommodated in a predetermined region of the first housing 11 and the second housing 20. That is, the filter 10 includes a storage area that stores the core wire exposed portion 30.
The core wire exposed portion 30 is formed by peeling off a portion of the covering material 31 at the intermediate portion of the electric wire 3 and exposing the plurality of core wires 32 from the covering material 31 with a predetermined length. In the present embodiment, the core wire exposed portion 30 is folded back in the axial direction so that the core wire exposed portion 30 is apparently positioned at the end of the electric wire 3 even though it is an intermediate portion of the electric wire 3.

The first housing 11 constituting the filter 10 is formed of a tapered resin molded body in which the inner diameter and the outer diameter are gradually reduced from the rear end 11B side toward the front end 11A side. As will be described in detail later, the inner diameter of the first housing 11 is reduced in this way in order to position the electric wire 3 when the electric wire 3 is inserted from the rear end 10B of the filter 10.
On the outer periphery of the area near the rear end 11B of the first housing 11 and covered by the second housing 20, there are all ribs (protrusions) 12 protruding outward in the radial direction, that is, toward the inner periphery of the second housing 20. It is formed over the circumference (FIG. 4). In the present embodiment, two ribs 12 are provided with an interval in the axial direction of the first housing 11. In addition, illustration of the rib 12 was abbreviate | omitted in FIG.

The first housing 11 has a through hole 110 that penetrates from the rear end 11 </ b> B to the front end 11 </ b> A, and holds the filter body 17 inside the through hole 110.
The filter body 17 having a circular outer shape is disposed coaxially with the first housing 11 inside the first housing 11 from the front end 11A. The filter body 17 can be made of a material called a waterproof and moisture permeable membrane. The filter main body 17 is held inside the first housing 11 with a gap S between the tip end 30 </ b> A of the core wire exposed portion 30. That is, the inner diameter of the first housing 11 at the position where the filter body 17 is held is smaller than the inner diameter of the rear end 11B of the first housing 11 and the outer diameter of the core wire exposed portion 30 (the outer diameter of the electric wire 3). The first housing 11 is reduced in diameter so that

As will be described later, it is possible to form a ventilation window on the side wall of the first housing 11 and hold the filter body 17 so as to cover the ventilation window, but in this case, it takes time to form the ventilation window. On the other hand, the form in which the filter main body 17 is provided inside the first housing 11 is preferable in reducing the number of manufacturing steps of the filter 10 because the operation of forming the ventilation window is not necessary.
Although the method of holding the filter body 17 in the first housing 11 is arbitrary, for example, when the first housing 11 is obtained by injection molding, the filter body 17 is disposed at a predetermined position of the molding die prior to molding. In order to reduce the number of manufacturing steps, it is preferable to form the first housing 11 integrally.

The second housing 20 is made of a heat-shrinkable resin material that shrinks when heated. The second housing 20 is formed as a member having a two-layer structure in which an adhesive layer 26 is provided in advance on the entire inner peripheral surface. As the adhesive layer 26 of the present embodiment, a hot melt adhesive that is melted by heating and solidifies due to a subsequent temperature decrease to exert an adhesive force is used.
The rear end 11 </ b> B side of the first housing 11 described above is inserted inside the second housing 20. In addition to the friction between the rib 12 on the outer periphery of the first housing 11 and the inner peripheral surface of the second housing 20, the rib 12 is locked inside the melted and solidified adhesive layer 26, whereby the first housing 11. And the second housing 20 are sufficiently coupled. The adhesive layer 26 is in close contact with the outer periphery of the core wire exposed portion 30 and the boundary portion between the core wire exposed portion 30 and the covering material 31, thereby preventing water from entering the electric wire 3.

A procedure for attaching the filter 10 to the electric wire 3 will be described below.
<Formation of core wire exposed portion 30>
The coating material 31 of the electric wire 3 is peeled off to expose the core wire 32, thereby forming the core wire exposed portion 30. The position where the core wire exposed part 30 is formed is arbitrary in the intermediate part. Then, the core wire exposed portion 30 is folded back. By doing so, the core wire exposed portion 30 can be positioned at the end portion of the electric wire 3 even though the core wire exposed portion 30 is actually an intermediate portion in the axial direction of the electric wire 3.
In the present embodiment, the core wire exposed portion 30 is folded only once, but the number of times the core wire exposed portion 30 is folded is not limited in the present invention. Further, the position to be folded back is not limited to the core wire exposed portion 30, and the portion covered by the covering material 31 in the vicinity of the core wire exposed portion 30 may be folded back.

<Filter 10 temporary attachment>
After the core wire exposed portion 30 is folded, the filter 10 is temporarily attached to the electric wire 3 by inserting the core wire exposed portion 30 into the filter 10 from the rear end 10B of the filter 10 (the first housing 11 and the second housing 20). . At this time, as shown in FIG. 4, the outer periphery of the core wire exposed portion 30 abuts on the inner periphery of the first housing 11, and the core wire exposed portion 30 is positioned with respect to the filter body 17 in the axial direction thereof, thereby A void S is formed.
Since the gap S is formed as long as the inner diameter of the first housing 11 and the outer diameter of the core wire exposed portion 30 at the holding position of the filter body 17 have the above-described relationship, the filter 10 has a different outer diameter. It can respond also to the electric wire 3 (electric wire 3 from which an outer diameter differs) provided with the core wire exposed part 30. FIG.
Moreover, since the filter main body 17 is arrange | positioned inside the 1st housing 11, when attaching the filter 10 to the electric wire 3, it can prevent that the person who performs attachment work touches the filter main body 17 carelessly.

  When the filter 10 is temporarily attached to the electric wire 3, the second housing 20 can be temporarily attached after the first housing 11 is temporarily attached. Alternatively, the first housing 11 and the second housing 20 are assembled and integrated. The filter 10 can be temporarily attached to the electric wire 3. In the latter case, the ribs 12 of the first housing 11 are assembled in a state of being locked to the inner peripheral surface (adhesive layer 26) of the second housing 20, so that the first housing 11 and the second housing 20 are prevented from coming off from each other. Is done. Moreover, in the latter case, there is an advantage that the work of attaching the filter 10 to the electric wire 3 can be completed only once.

<Heating and bonding>
If the filter 10 is temporarily attached to the electric wire 3, the adhesive layer 26 made of a hot melt adhesive is heated and melted by an appropriate means. During the heating and melting, the second housing 20 contracts. The heated hot melt adhesive is solidified by raising the temperature to the required temperature and then stopping the heating and cooling (natural cooling, forced cooling). Then, as shown in FIG. 4, the adhesive layer 26 includes the second housing 20, the first housing 11, the core wire exposed portion 30, and the covering materials 31, 31 adjacent to each other by folding back the core wire exposed portion 30. Spread between the two and glue them together. This completes the work of attaching the filter 10 to the electric wire 3.
Here, since the second housing 20 is made of a heat-shrinkable material, the applied pressure accompanying the shrinkage of the second housing 20 is applied to the hot melt adhesive, which contributes to the improvement of the adhesive force. Further, the rib 12 prevents the hot melt adhesive melted by heating from flowing out between the first housing 11 and the second housing 20, so that the amount of the adhesive in the adhesive layer 26 is not insufficient. Bonding becomes possible.
The hot melt adhesive of the adhesive layer 26 is in close contact with the surface of the covering material 31, and from a plurality of core wires 32 exposed from one of the covering materials 31, 31 and from the other covering material 31. At least a portion near the covering material 31 in the gap G (FIG. 3) with the exposed plurality of core wires 32 is filled without any gap. In the state in which the electric wire 3 is held by the second housing 20, when the adjacent covering materials 31, 31 are in contact with each other, there is no gap between the covering materials 31, 31, and thus these covering materials 31, 31. Although the adhesive is not filled in between, the adhesive is in close contact with the surface of the covering material 31 and the gap G is filled with the adhesive, so that the inside of the filter 10 is waterproofed. That is, even if water is transmitted between the adjacent covering materials 31 and 31 from the front end portion 3A and the base end portion 3B side, this water is prevented from entering the inside of the filter 10 and reaching the core wire exposed portion 30. it can. Thus, the filter 10 has high sealing performance against water intrusion from the boundary portion with the electric wire 3.
The adhesive used for the adhesive layer 26 does not have fluidity enough to spread between the core wires 32 and 32 exposed in a bundle from the covering material 31, so that air can pass between the core wires 32 and 32. Gaps remain.

According to this embodiment described above, the following operations and effects can be obtained.
Even if an internal pressure change occurs in the sealed case of the connector 41 due to a temperature change, outside air is taken into the filter 10 from the filter body 17. Since this outside air is further taken in between the core wires 32 of the electric wires 3 through the core wire exposed portions 30, the internal pressure change generated in the connector 41 is not transmitted to the base end portion 3B of the electric wires 3. For this reason, even if the base end portion 3B of the electric wire 3 is submerged or water droplets are attached, the water does not reach the inside of the case of the connector 41 from the base end portion 3B through the core wires 32. As a result, it is possible to prevent the occurrence of a malfunction in the circuit portion in the connector 41.

  Next, in the filter 10, the electric wire 3 is drawn from the rear ends 10 </ b> B of the housings 11 and 20. That is, the filter 10 does not need to penetrate the housing through the housing when the filter 10 is disposed on the wire 3. Therefore, the filter 10 can be attached to the electric wire 3 even after finishing the wiring work such as routing the electric wire 3 in which the connector 41 and the terminal 42 are connected to the distal end portion 3A and the base end portion 3B. Great freedom.

  Further, since the air gap S is formed between the filter main body 17 and the tip 30 </ b> A of the core wire exposed portion 30, the outside air can be reliably taken in between the core wires 32 via the filter main body 17. That is, when the core wire exposed portion 30 comes into contact with the filter main body 17, there is a risk that the fine ventilation holes formed in the filter main body 17 may be blocked. However, by providing the gap S, it is possible to avoid blocking the ventilation holes. it can. As described above, the core S is positioned with respect to the filter body 17 through the first housing 11 having a reduced inner diameter, so that the gap S is reliably provided.

  The filter 10 has the function of holding the filter body 17 in the first housing 11, and the second housing 20 has the function of sealing the core wire exposed portion 30 and holding it in close contact with the electric wire 3. . In particular, in order to secure the latter function, the second housing 20 is made of a heat-shrinkable material to improve the adhesion with the electric wire 3. However, the present invention allows the first housing 11 that holds the filter body 17 to be attached to the electric wire 3 without using the second housing 20, that is, the first housing 11 has the above two functions. .

  Moreover, according to this embodiment, since the adhesive layer 26 made of a hot melt adhesive is provided in advance on the inner peripheral surface of the second housing 20, after the core wire exposed portion 30 formed on the electric wire 3 is inserted into the filter 10. The filter 10 can be attached to the electric wire 3 simply by heating.

<Modification>
Several modifications to the electric wire 3 and the filter 10 described above will be described.
First, the modification regarding the routing of the electric wire 3 is shown.
As shown in FIG. 5A, in the present invention, the electric wire 3 drawn from the rear end side of the filter 10 can be bent at an arbitrary angle with respect to the core wire exposed portion 30. By doing so, the electric wire 3 can be along with the shape of wiring space.
Further, as shown in FIG. 5B, the core wire exposed portion 30 may be bent in a direction intersecting the wiring surface F (perpendicular direction in the drawing) with respect to the electric wire 3 drawn out on the predetermined wiring surface F. it can. According to this, even when there is no space occupied by the filter 10 (core wire exposed portion 30) on the wiring surface F, the filter 10 can be attached to the electric wire 3.

FIG. 6 shows a filter 2 according to a modification of the present invention.
The filter 2 is different from the filter 10 described above in that the filter main body 17 is held on the front end 11A of the first housing 11 by, for example, heat welding. Like the filter 10, the filter body 17 can be easily held in the first housing 11 without inserting the filter body 17 into the molding die of the first housing 11.

FIG. 7 shows a filter 5 according to another modification of the present invention.
The filter 5 is different from the filter 10 in the position of the filter body 17. The tip end side of the cap 51 which is a member corresponding to the first housing 11 is closed.
On the side wall 51A of the cap 51, a ventilation window 52 penetrating the front and back of the side wall 51A is formed. The filter body 17 has an area larger than the opening area of the ventilation window 52 and covers the ventilation window 52. The filter body 17 is held by the cap 51 by being fixed to the side wall 51 </ b> A around the ventilation window 52 with, for example, an adhesive.

  When the filter main body 17 is provided on the side wall 51 </ b> A of the cap 51 like the filter 5, there are the following advantages. In the filters 10 and 2, the size of the filter body 17 is naturally determined by the diameter of the first housing 11, whereas in this example, the ventilation window 52 can be formed in an arbitrary size on the side wall 51 </ b> A of the cap 51. The degree of freedom of size 17 is great. For example, by enlarging the filter body 17, even if a part of the filter body 17 is clogged, the air permeability can be maintained. 7 shows an example in which the ventilation window 52 and the filter main body 17 are arranged upward in the vertical direction, but the filter main body 17 is provided at a position where the filter main body 17 is difficult to get wet when the electric wire 3 is wired. Can do. For example, the ventilation window 52 and the filter main body 17 are provided in the vertical direction upward (example in FIG. 7) or in the horizontal direction. Furthermore, a plurality of ventilation windows 52 can be formed on the side wall 51 </ b> A of the cap 51, and the filter body 17 can be provided in each of these ventilation windows 52.

FIG. 8 shows a filter 6 according to still another modification of the present invention.
The above-described filters 10, 2, and 5 are provided at the apparent end portion of the electric wire 3, but in the present invention, the filter 6 is provided at the tip end portion (core wire exposed portion) 7 </ b> A that is the original end portion of the electric wire 7. Is acceptable.

  In addition to the above, the configurations described in the above embodiments can be selected or modified as appropriate to other configurations without departing from the gist of the present invention.

10, 2, 5, 6 Filter 3, 7 Electric wire 4 Device 10B Rear end 11 First housing 11A Front end 11B Rear end 12 Rib (protrusion)
17 Filter body 20 Second housing 26 Adhesive layer (hot melt adhesive)
30 core wire exposed portion 30A tip 31 coating material 32 core wire 41 connector 42 terminal 51 cap (first housing)
110 Through-hole S Air gap

Claims (9)

A housing which is attached to an electric wire drawn from the rear end and accommodates a core wire exposed portion where the core wire of the electric wire is exposed;
A filter body that is held in the housing and ensures ventilation into the housing;
A filter comprising: The filter body has water repellency,
The filter according to claim 1. In the housing, a through-hole penetrating from the rear end to a front end on the opposite side is formed,
The filter body is held in the through hole or at the front end.
The filter according to claim 1 or 2. The housing is
A first housing holding the filter body;
A second housing for holding the electric wire,
The second housing is in close contact with the electric wire,
The filter according to any one of claims 1 to 3. An electric wire having a core wire exposed portion where the core wire is exposed, and having a filter attached to accommodate the core wire exposed portion,
The filter is the filter according to any one of claims 1 to 4,
An electric wire characterized by that. Inside the housing,
A gap is formed between the filter main body and the tip of the core wire exposed portion,
The electric wire according to claim 5. The wire has the core wire exposed portion folded back,
The folded core wire exposed portion is accommodated in the housing,
The electric wire according to claim 5 or claim 6. In the manufacturing method of the electric wire according to any one of claims 5 to 7,
Between the filter and the electric wire, a hot melt adhesive that solidifies through melting by heating is interposed,
Bonding the filter to the wire by heating,
The manufacturing method of the electric wire characterized by this. The hot melt adhesive is provided integrally with the filter in advance,
The manufacturing method of the electric wire of Claim 8.

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