JP2015015812A - Protective structure for electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective structure for an electric wire, which can improve flexibility while suppressing an increase in electric wire diameter.SOLUTION: In a protective structure for an electric wire 4 externally covered with a shield member 2, the shield member 2 is formed like a tube along an elongation direction of the electric wire in such a manner that a strip conductor 20 is spirally wound. A width-direction cross-section of the strip conductor assumes a corrugated shape having at least one convex part 21 and at least one concave part 22. The strip conductor is wound in such a manner that the convex part and the concave part partially overlap each other in a radial direction.

Description

  The present invention relates to a structure for protecting an electric wire by covering it with a shield member.

  Conventionally known as various protective structures to prevent the damage of the electric wires, for example, a structure in which a single or plural electric wires are inserted into a resin round tube, or a structure in which a tape as an exterior material is wound around an electric wire. It has been. Patent Documents 1 and 2 disclose, as an example, a protective structure in which a corrugated tube is sheathed on an electric wire. By covering the corrugated tube in this way and routing the electric wire in a state of being inserted into the corrugated tube, the electric wire is protected while allowing some bending or twisting of the electric wire to be routed. .

JP 2009-22064 A JP 2013-55754 A

  Here, the electric wires often have a multi-layer structure concentrically. For example, the inner conductor (core wire) is covered with a first insulating coating (inner insulator), and the outer conductor (shield conductor) provided on the outer periphery of the inner insulator is covered with a second insulating coating (protective sheath). In the case of a four-layer structure or the like, the diameter of the electric wire is increased by the amount of the superimposed layers. As the wire diameter increases, the flexibility (flexibility) of the wire tends to decrease, and when the corrugated tube is sheathed on the outermost layer (for example, a protective sheath), the flexibility of the wire is further decreased. It will be. In addition, if the electric wires are multi-layered, the number of members including an exterior material (shield member) such as a corrugated tube increases, which tends to increase processing costs.

  The present invention has been made on the basis of this, and the problem to be solved is to provide an electric wire protection structure capable of improving flexibility while suppressing an increase in electric wire diameter. is there.

  In order to solve the above-mentioned problems, the present invention is an electric wire protection structure in which a shield member is sheathed, and the shield member has a tubular shape in which a strip-like conductor is wound in a spiral shape along the extending direction of the electric wire. The band-shaped conductor has a corrugated shape in which at least one cross section in the width direction has a convex curved portion and a concave curved portion, and the convex curved portion and the concave curved portion are partially overlapped in the radial direction. It is characterized by being.

  According to this, by covering the electric wire with the shield member, it is possible to protect the electric wire by surrounding the outer circumference of the electric wire without any gap with the shield member. For example, the pebbles jumped up from the road surface by the wheels when the vehicle is running It is possible to reliably prevent damage to the electric wire due to impacts from gravel, peripheral components that have been swung due to vibrations during traveling of the vehicle, and the like. In addition, since the shield member has a corrugated structure, even if the pebbles, gravel, and rocking peripheral parts that are flipped up collide with each other, the impact can be distributed and loaded, so chipping and damage It is possible to reliably prevent damage to the shield member. Further, since the shield member has both a shield function for preventing propagation of electromagnetic noise generated from electrical components and the like and a wire protection function, it is not necessary to provide a shield conductor on the wire itself. Therefore, the diameter of the electric wire can be reduced, and the flexibility (flexibility) can be improved.

  In this case, for example, the shield member can be formed by winding a plurality of strip-shaped conductors having different waveforms or a plurality of strip-shaped conductors having different waveforms. Thereby, the site | part from which flexibility (flexibility) differs can be mixed in this shield member.

  ADVANTAGE OF THE INVENTION According to this invention, the protection structure of the electric wire which can aim at the improvement of a flexibility can be implement | achieved, suppressing the increase in an electric wire diameter.

It is a top view showing the whole electric wire protection structure concerning one embodiment of the present invention. It is a figure which shows the protection structure of the electric wire which concerns on one Embodiment of this invention, Comprising: It is a figure which shows the longitudinal cross-section in the arrow A1 part of FIG. 1 from an arrow direction. It is a figure which expands and shows the engagement state of an annular conductor, (a) is a figure which shows the state covered with the electric wire, (b) is the bending force of the arrow A31 direction of the figure (a) acted The figure which shows a state, (c) is a figure which shows the state to which the bending force of the arrow A32 direction of the figure (a) was acted. It is a figure which shows the structure of the shield member which wound the several strip | belt-shaped conductors from which a waveform differs, or one strip | belt-shaped conductor which makes a several different waveform, and mixed the site | part from which a flexibility differs. It is a figure which shows the example of 1 structure at the time of making a shield member (each annular conductor) into a saddle-type structure.

  Hereinafter, the wire protection structure of the present invention will be described with reference to the accompanying drawings. The electric wire protection structure of the present invention is formed by surrounding a shield member on the outer periphery of the electric wire, and can be applied as a structure for protecting an electric wire routed around a vehicle such as an automobile, for example. The application is not limited to this.

  1 and 2 show an electric wire protection structure according to the present embodiment (hereinafter simply referred to as a protective structure as appropriate). FIG. 1 is a plan view showing the entire protective structure, and FIG. 2 is a view showing a longitudinal section in the arrow A1 portion of FIG.

  As shown in FIGS. 1 and 2, in the electric wire protection structure according to the present embodiment, the outer periphery of one electric wire 4 is surrounded by a shield member 2 to protect the electric wire 4. In addition, the number of the electric wires 4 to be protected may be plural, and a structure in which two or more arbitrary numbers of electric wires (for example, a wire harness in which plural electric wires are bundled) are collectively protected by one shield member; It is also possible to assume. As an example, the electric wire 4 according to the present embodiment is configured by covering a plurality of core wires (hereinafter collectively referred to as an internal conductor) 41 with an insulating coating (hereinafter referred to as a sheath) 42. The inner conductor may be composed of a single core wire.

  The shield member 2 is formed in a tubular shape along the extending direction of the electric wire 4 (in the left-right direction in FIGS. 1 and 2) by winding the strip-shaped conductor 20 in a spiral shape. The strip-shaped conductor 20 has a waveform in which the cross section in the width direction (short direction) has at least one convex curved portion 21 and a concave curved portion 22, and the convex curved portion 21 and the concave curved portion 22 are partially overlapped in the radial direction. It is wound around. That is, if a portion corresponding to one turn of the strip-shaped conductor 20 is the annular conductor 2a, the strip-shaped conductor 20 has the adjacent annular conductor 2a partially overlapped with each other in the radial direction by the convex curved portion 21 and the concave curved portion 22. It is the structure which continued helically in the engaged state. In this case, the convex curved portion 21 is a large-diameter portion, and the concave curved portion 22 is a small-diameter portion, and are partially engaged with each other in the radial direction.

  1 and 2 show an example of the configuration of the shield member 2 in which the strip-shaped conductor 20 having the convex curved portion 21 and the concave curved portion 22 is wound one by one. You may have two or more convex curved parts and concave curved parts. However, it is preferable that the convex curved portion and the concave curved portion forming one waveform are formed symmetrically with each other. In addition, the shield member 2 (the wound strip-shaped conductor 20) has a minimum inner diameter (inner diameter dimension of a portion where the concave curved portion 22 is most contracted) larger than an outer diameter dimension of the sheath 42 of the electric wire 4. The size is set. Thereby, the electric wire 4 can be inserted in the wound strip | belt-shaped conductor 20 (each annular conductor 2a), and the shield member 2 can be armored.

  The strip conductor 20 can be formed by, for example, pressing a conductive plate material (such as a conductive metal plate or a conductive rubber sheet) into a corrugated shape. That is, the shield member 2 formed into a tubular shape by spirally winding the belt-like conductor 20 functions as a shield conductor, and can be prevented from propagation of electromagnetic noise generated from electrical components by being sheathed on the electric wire 4. It has become. For this reason, since it is not necessary to provide a shield conductor in the electric wire itself, the diameter of the electric wire 4 can be reduced, and the flexibility (flexibility) can be improved. The spiral angle of the belt-like conductor 20 (the angle at which the annular conductor 2a tilts the end 23 in the extension direction of the electric wire 4 with respect to the extension direction (angle θ shown in FIG. 2)) can be arbitrarily set. However, it is preferable to set to about 45 °.

  In FIG. 3, the engagement state of the annular conductor 2a (the winding state of the strip conductor 20) is shown in an enlarged manner. As shown in FIG. 3 (a), two adjacent annular conductors 2a (for example, the left annular conductor 6 and the right annular conductor 8 shown in FIG. 3) are connected to one annular conductor 6 (convex curved portion 61). The end portion 61a of the other annular conductor 8 enters the concave curved portion 82 of the other annular conductor 8 from the outer diameter side (the upper side in FIG. 3), and the end portion 82a of the other annular conductor 8 (concave curved portion 82) is the one annular conductor 6. It is in the state which entered into the convex-curved part 61 from the inner diameter side (lower side in the figure). As a result, the end 61a of the convex curved portion 61 and the end 82a of the concave curved portion 82 are engaged with each other from the outside and the inside in the radial direction, and the convex curved portion 61 and the concave curved portion 82 are engaged with each other. It is continuous in a tubular shape in a state of being partially wrapped (superposed) in the radial direction. In this engaged state, the annular conductor 6 is movable in the radial direction and in the extending direction of the electric wire 4 in the range where the end 61 a of the convex curved portion 61 is engaged with the concave curved portion 82 of the annular conductor 8. The end portion 82a of the concave curved portion 82 is similarly movable in the engagement range of the annular conductor 8 with the convex curved portion 61. And since such an engagement state is made continuous over the extending | stretching direction of the electric wire 4, the shield member 2 has the outstanding flexibility (flexibility), and it is adjacent even if it is made to bend. It can be set as the structure which does not produce a space | gap between annular conductors.

  For example, when a force (bending force) in the bending direction (the direction indicated by the arrow A31 in FIG. 3A as an example) is applied to the shield member 2, the annular conductor 8 is lifted in the A31 direction by the bending force (FIG. 3). (State shown in (b)). At that time, since the annular conductor 8 is lifted so that the end 61a of the convex curved portion 61 moves relatively along the curve (concave curved surface) of the concave curved portion 82, the annular conductor 8 is brought into engagement with the end 61a and the end 82a. It is possible to prevent the bending force from being concentratedly loaded. That is, it is possible to distribute the bending force and load the ends 61a and 82a, and to suppress the strong interference between the ends 61a and 82a. On the other hand, when a bending force in the direction opposite to the A31 direction (the direction indicated by the arrow A32 in FIG. 3A) is applied to the shield member 2, the annular conductor 6 is lifted in the A32 direction by the bending force (FIG. 3 ( c) state). At that time, since the end 61a of the convex curved portion 61 moves along the curve (concave curved surface) of the concave curved portion 82, the annular conductor 6 disperses the flexural force in the same manner as when the flexural force in the A31 direction is applied. It becomes possible to load, and it can suppress that edge part 61a, 82a interferes strongly.

  Thus, by making the shield member 2 (each annular conductor 2a) a structure (wave structure) having the convex curved portion 21 and the concave curved portion 22, the end portions 23 of the adjacent annular conductors 2a are curved and engaged with each other. Therefore, gaps can be formed between the convex curved portions 21 and 21 and between the end portions 23 and 23, respectively. For example, as shown in FIG. 5, when the cross section in the width direction of the shield member 9 (each annular conductor 9a) has a bowl shape (rectangular shape), the end portions 91 of the adjacent annular conductors 9a face each other in parallel and engage with each other. Since it will be in a state, the space | gap between the adjacent cyclic | annular conductors 9a and between the edge parts 91 tends to become narrow easily. Therefore, according to the shield member 2 having the corrugated structure according to the present embodiment, it is easy to form a wider gap between the convex portions and the ends of the adjacent annular conductors 2a than the shield member 9 having the saddle type structure. That is, the adjacent annular conductors 2a ensure a sufficient movable space, in other words, when the adjacent convex curved portions 21 are bent (for example, the bending force in the direction indicated by the arrows A31 and A32 in FIG. It is possible to make it difficult to interfere with each other. As a result, the shield member 2 can be easily bent, and flexibility (flexibility) can be improved.

  In the configuration shown in FIG. 1 and FIG. 2, since the strip-shaped conductor 20 (one or a plurality of conductors) having the same waveform is wound, the shield member 2 has a structure in which the same annular conductor 2a is continuous. Thus, it is configured to have substantially constant flexibility (flexibility) throughout. On the other hand, the shield member may have a configuration in which a plurality of strip-shaped conductors having different waveforms or a single strip-shaped conductor having a plurality of different waveforms are wound. For example, it is also possible to wind a strip-like conductor having different sizes (wave height and length) of the convex and concave portions. FIG. 4 shows an example of a configuration in which two forms of strip conductors 31 and 32 having the same wave height and different lengths are mixed and wound. In this case, the shield member 3 is configured by interposing the strip-shaped conductor 31 having a small wave length between the strip-shaped conductors 32 having a large wave length. Since the strip-shaped conductor 31 has a smaller wave length (corresponding to the width of each strip-shaped conductor 31, 32) than the strip-shaped conductor 32, the strip-shaped conductor 31 has higher flexibility (flexibility) when wound in a spiral shape. That is, parts having different flexibility (flexibility) can be mixed in the shield member 3. Therefore, for example, by arranging the strip-shaped conductor 31 in a portion where higher flexibility is required, it is possible to configure the highly versatile shield member 3 that is excellent in the degree of freedom of wiring of the electric wires 4. Here, for example, as shown in FIG. 5, when the shield member 9 (each annular conductor 9a) has a saddle-shaped structure, the adjacent annular conductors 9a easily interfere with each other when bent. It is difficult to shorten the width dimension. Therefore, compared with the shield member 3 having the corrugated structure according to the present embodiment, the shield member 9 having the saddle-shaped structure has a difficulty in mixing portions having different flexibility (flexibility).

  As described above, according to this embodiment, the outer periphery of the electric wire 4 can be surrounded by the shield members 2 and 3 without a gap by covering the electric wires 4 with the shield members 2 and 3, and the electric wires 4 can be protected. it can. For example, it is possible to prevent pebbles and gravel bounced up from the road surface by wheels during traveling of the vehicle, peripheral components that have been swung by vibrations during traveling of the vehicle, and the like from hitting the electric wire 4, and the impact that these give to the electric wire 4 It can be greatly relaxed. Furthermore, since the shield members 2 and 3 (each annular conductor 2a) have a structure (wave structure) having a convex curved portion 21 and a concave curved portion 22, pebbles and gravel that are flipped up, and rocking peripheral components Even in the case of collision, the impact (stress) can be distributed and distributed in its entirety (corrugated structure) without concentrating on the specific part of the shield members 2 and 3. For example, as in the case where the shield member 9 (each annular conductor 9a) has a bowl-shaped structure (see FIG. 5), it is possible to effectively avoid the stress at the time of impact from being concentrated on the corners of each annular conductor 9a. Can do. Therefore, it is possible to reliably prevent damage to the shield members 2 and 3 such as chipping due to pebbles and gravel and breakage due to impact from peripheral parts.

  Further, the shield members 2 and 3 having the protection function of the electric wire 4 as described above also have a shielding function by being sheathed on the electric wire 4. That is, the shield members 2 and 3 according to the present embodiment are configured to have both the protection function of the electric wire 4 and the shield function. Therefore, since the shield members 2 and 3 can protect and shield the electric wire 4 at the same time, it is not necessary to provide a protective member for the electric wire 4 separately from the shield members 2 and 3. As described above, according to the present embodiment, it is possible to improve the flexibility (flexibility) of the electric wire 4 while suppressing an increase in the electric wire diameter. Flexibility (flexibility) can be improved.

  The present invention has been described based on the embodiments shown in FIGS. 1 to 4. However, the above-described embodiments are merely examples of the present invention, and the present invention is limited to the configuration of the above-described embodiments. It is not limited. Therefore, it is obvious to those skilled in the art that the present invention can be implemented in a form modified or changed within the scope of the gist of the present invention. It goes without saying that it belongs to the claims.

2 Shield member 4 Electric wire 20 Strip conductor 21 Convex part 22 Concave part

Claims (2)

It is a protective structure for an electric wire made of an outer shield member,
The shield member is formed in a tubular shape along the extending direction of the electric wire by winding a strip-shaped conductor spirally,
The band-shaped conductor has a corrugated shape in which a cross section in the width direction has at least one convex curved portion and a concave curved portion, and is wound with the convex curved portion and the concave curved portion partially overlapped in the radial direction. Electrical wire protection structure.   2. The shield member is formed by winding a plurality of strip-shaped conductors having different waveforms or a plurality of strip-shaped conductors having a plurality of different waveforms, and mixing portions having different bendability. The protective structure of the electric wire as described in 2.

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