JP2009022064A - Corrugated tube and structure for protecting electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more inexpensively prevent or reduce damage of an electric wire due to an end adjacent to a slit of a corrugated tube. <P>SOLUTION: In the corrugated tube 10 having a slit 11 formed over the entire length of an axial line direction, the end 11a of the slit 11 is formed into a shape opened toward an end 12 of the corrugated tube 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a corrugated tube and a protection structure for an electric wire that protects an electric wire accommodated in the corrugated tube.

  There exists a corrugated tube which accommodates electric wires, such as a wire harness and a power cable, and protects the said electric wire (for example, refer patent documents 1-7).

  In Patent Document 1, a plate-like portion extending along the axial direction of the tube main body and an arc-shaped ridge portion bulging on the outer peripheral surface excluding the plate-like portion are continuously formed along the axial direction. A corrugated tube in which a slit is formed along the axial direction of the plate-like portion after integrally forming the bellows-like portion, and the plate-like portion has a cross-sectional shape including at least a mountain-shaped portion or a valley-shaped portion, The thing which formed the slit in the top part or the bottom part is described.

  In Patent Document 2, at least two vertical slits are provided at the end of the corrugated tube, and the root of the vertical slit is taped, whereby the wire harness is brought into contact with the corrugated tube and the wire harness. Techniques to prevent damage are described.

  Further, in Patent Document 3, an end cap is attached to the end portion of the corrugated tube, and the slit of the corrugated tube is covered with the peripheral wall portion of the end cap, whereby both ends of the slit bite into the electric wire and damage the electric wire. Techniques for preventing this are described.

  In Patent Document 4, a cover, which is a strip-shaped resin molded part, is fixed to a wire harness with a tape, and the corrugated tube is covered with the wire harness so that both sides of the slit of the corrugated tube are positioned on the outer peripheral side of the cover. Thus, a technique for preventing the wear and disconnection of the electric wire is described.

  Patent Document 5 discloses a corrugated tube composed of an inner tube having a slit opening and an outer tube fitted on the inner tube so as to cover the slit opening of the inner tube. It is described that the inner peripheral surface is formed of a material softer than the outer sheath of the electric wire constituting the wire harness.

  Patent Document 6 describes a corrugated tube formed of a soft material composition in which both sides of a slit are blended with a soft material whose hardness is smaller than that of the outer sheath of an electric wire.

  Further, Patent Document 7 discloses an electric wire cover having a tubular main body in which the overlapping end portions that overlap each other with one side being the outer side and the other being the inner side are formed in the longitudinal direction of the side surface. A material made of a softer material than the other parts is described.

Japanese Patent Laid-Open No. 2004-19724 JP 2000-134761 A JP 2002-369330 A JP 2000-184551 A JP 2006-5982 A JP 2006-5983 A JP-A-8-98367

  When the end of the corrugated tube is located at a portion where the electric wire such as a wire harness is bent, when the slit portion is located inside the bend, the end adjacent to the slit of the corrugated tube makes point contact with the electric wire. Thereby, there exists a possibility that a coating | cover and braiding of an electric wire may be damaged.

  Although the technique described in the said patent documents 1-7 is for preventing the damage of the electric wire by contact with a corrugated tube and an electric wire, a lower cost technique is requested | required.

  Therefore, the present invention provides a corrugated tube or electric wire protection structure capable of preventing or reducing the damage of the electric wire by the end adjacent to the slit of the corrugated tube at a lower cost.

  The corrugated tube according to the present invention is a corrugated tube in which a slit is formed over the entire length in the axial direction, and the end of the slit is formed in a shape that widens toward the end of the corrugated tube. And

  In one aspect of the present invention, the shape of the end of the slit is formed by cutting the end of the tube.

  Moreover, in another one aspect | mode of this invention, the shape of the edge part of the said slit is formed by bend | folding the edge part of the tube in which the notch | incision was provided at the edge part to the outer side from the said notch | incision.

  Moreover, in another one aspect | mode of this invention, the shape of the edge part of the said slit is formed by heating and fuse | melting the edge part of a tube.

  The corrugated tube according to the present invention is a corrugated tube in which a slit is formed over the entire length in the axial direction, and at least one circumferential notch is formed in the vicinity of the end of the slit of the corrugated tube. It is characterized by.

  The electric wire protection structure according to the present invention is a protective structure for protecting an electric wire housed in a corrugated tube in which a slit is formed over the entire length in the axial direction, and the slit is provided on the outer periphery of the end portion of the corrugated tube. A first adhesive tape that is pasted so as to straddle, wherein a part of the first adhesive tape enters the interior of the corrugated tube from the slit and is interposed between the corrugated tube and the electric wire. 1 adhesive tape and a part of the first adhesive tape are pasted on the outer periphery of the corrugated tube so as to straddle the slit so as to maintain a state of being interposed between the corrugated tube and the electric wire. And a second adhesive tape formed.

  Moreover, the electric wire protection structure according to the present invention is a protective structure for protecting an electric wire housed in a corrugated tube having a slit formed over the entire length in the axial direction, and the slit of the corrugated tube among the surfaces of the electric wire. It has the membrane | film | coat which affixed on the position where the edge part which adjoins to contact | abuts, and the said edge part avoids contacting the said electric wire directly.

  ADVANTAGE OF THE INVENTION According to this invention, the protection structure of the corrugated tube or electric wire which can prevent or reduce the damage of the electric wire by the edge part adjacent to the slit of a corrugated tube at lower cost can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic side view showing the configuration of the corrugated tube 10 according to the first embodiment. The corrugated tube 10 accommodates an electric wire 1 such as a wire harness or a power cable inside to protect the electric wire 1.

  As shown in FIG. 1, the corrugated tube 10 is a flexible bellows-like tube in which a slit (also referred to as “harasaki”) 11 is formed over the entire length in the axial direction.

  In the present embodiment, the end portion 11 a of the slit 11 extends toward the end portion 12 of the corrugated tube 10 from the viewpoint of preventing or reducing damage to the electric wire 1 due to the end portion adjacent to the slit 11 of the corrugated tube 10. It is formed into a shape. For example, the end 11a of the slit 11 is formed in a substantially V-shaped cutout shape. The above “end adjacent to the slit of the corrugated tube” means a portion adjacent to the slit among the axial ends of the corrugated tube, and the same applies hereinafter.

  The shape of the end portion 11a of the slit 11 may be formed by an appropriate method, but in the present embodiment, it is formed by cutting the end portion of the tube. Here, the tube to be excised is a tube that finally becomes the corrugated tube 10 according to the present embodiment. In a preferred aspect, the end portion of the corrugated tube in which the slit is formed over the entire length in the axial direction is cut into a substantially V shape, and the corrugated tube 10 according to the present embodiment is created. However, the end portion of the corrugated tube in which the slit is not yet formed may be excised, and then the slit may be formed over the entire length in the axial direction.

  Thus, in this Embodiment, the edge part of the slit of a corrugated tube is formed in the shape expanded toward the edge part of a corrugated tube. For this reason, the contact between the end portion adjacent to the slit of the corrugated tube and the electric wire becomes a line contact, the contact surface pressure or sliding resistance is lowered, and the damage to the electric wire by the end portion adjacent to the slit of the corrugated tube is prevented or reduced. It becomes possible. Moreover, the effect that the operation | work which lets an electric wire pass in a corrugated tube becomes easy can also be acquired. Further, since no additional member is required and the shape can be formed by a simple method, the above effect can be obtained at low cost.

  In this embodiment, the shape of the end portion of the slit is formed by cutting the end portion of the tube. Therefore, the shape can be formed by a simple method, and the shape can be formed at a low cost. can do.

  In FIG. 1, the left end portion of the corrugated tube 10 is omitted for the sake of drawing, but the shape of the slit may be formed at both end portions of the corrugated tube 10 or on one side. You may form only in an edge part.

[Second Embodiment]
FIG. 2 is a schematic side view showing the configuration of the corrugated tube 20 according to the second embodiment. The corrugated tube 20 is almost the same as the corrugated tube 10 according to the first embodiment. Hereinafter, although corrugated tube 20 is demonstrated, about the part which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In this Embodiment, the shape of the edge part 11a of the slit 11 is formed by bending the edge part of the tube in which the notch was provided at least at the edge part to the outer side from the said notch. Here, the tube to be bent is a tube that finally becomes the corrugated tube 20 according to the present embodiment. In a preferred embodiment, the end portion of the corrugated tube in which a slit is formed over the entire length in the axial direction is bent outward in a substantially V shape from the slit, and the corrugated tube 20 according to the present embodiment is created. . However, the end portion of the corrugated tube in which a cut is provided only at the end portion may be bent outward from the cut and then a slit may be formed over the entire length in the axial direction.

  The bent shape may be formed by an appropriate method. For example, the bent shape is formed by pinching and bending both side portions of the cut using pliers or the like.

  Thus, in the present embodiment, the shape of the end portion of the slit is formed by bending the end portion of the tube provided with a cut at least at the end portion outward from the cut. For this reason, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained. That is, the R portion is formed by bending, and the R portion comes into contact with the electric wire, so that it is possible to further reduce the contact surface pressure or sliding resistance.

[Third Embodiment]
FIG. 3 is a schematic side view showing the configuration of the corrugated tube 30 according to the third embodiment. The corrugated tube 30 is almost the same as the corrugated tube 10 according to the first embodiment. Hereinafter, although corrugated tube 30 is demonstrated, about the part which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the present embodiment, the shape of the end 11a of the slit 11 is formed by heating and melting the end of the tube. In a preferred aspect, the end portion of the corrugated tube in which the slit is formed over the entire length in the axial direction is heated and melted to produce the corrugated tube 30 according to the present embodiment. However, the end of the tube in which the slit is not yet formed may be heated and melted, and then the slit may be formed over the entire length in the axial direction.

  The end portion may be melted by an appropriate method. For example, the end portion is heated and melted by the heat of a burner, a scissor, or a dryer. For example, the slit may be spread by hand and melted with a burner, or a heated pointed scissors 32 may be applied to the end of the corrugated tube 31 as shown in FIG.

  Thus, in this Embodiment, the shape of the edge part of a slit is formed by heating and fuse | melting the edge part of a tube. For this reason, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained. That is, as shown in FIG. 5, the end portion 33 adjacent to the slit 11 of the corrugated tube 30 is melted and has a dull edge, so that it is possible to further reduce the contact surface pressure or sliding resistance. .

[Fourth Embodiment]
FIG. 6 is a schematic side view showing the configuration of the corrugated tube 40 according to the fourth embodiment. The corrugated tube 40 accommodates the electric wire 1 such as a wire harness or a power cable inside to protect the electric wire 1.

  As shown in FIG. 6, the corrugated tube 40 is a flexible bellows-like tube in which a slit 41 is formed over the entire length in the axial direction.

  In the present embodiment, from the viewpoint of preventing or reducing damage to the electric wire 1 due to the end portion adjacent to the slit 41 of the corrugated tube 40, at least one circumferential cut is provided in the vicinity of the end portion of the slit 41 of the corrugated tube 40. 42 is formed. Although at least one notch 42 may be provided, it is preferably one to several. In the example of FIG. 6, three cuts 42 are made at the end of the corrugated tube 40.

  The notch 42 may be formed by an appropriate method. For example, the notch 42 is formed by cutting the slit 41 with a scissors after spreading the slit 41 by hand.

  Thus, in this embodiment, at least one circumferential cut is formed in the vicinity of the end of the slit of the corrugated tube. For this reason, according to this embodiment, the rigidity of the end adjacent to the slit of the corrugated tube is reduced, the contact surface pressure is reduced, and damage to the electric wire by the end adjacent to the slit of the corrugated tube is prevented or reduced. Is possible. Further, no additional member is required, and the above-mentioned cut can be formed by a simple method, so that the above-described effect can be obtained at low cost.

  Further, the corrugated tube according to the present embodiment has the following effects as compared with the one described in Patent Document 2. As shown in FIG. 7, in the corrugated tube 45 provided with the longitudinal slits described in Patent Document 2, when the wire harness 1 ′ is assembled to a vehicle or the like, the corrugated tube 45 hits other parts 46. There is a possibility that the dividing portion 45a remains bent outward. If the divided portion 45a remains folded outward, the wire harness 1 'is not protected by the corrugated tube 45 at the bent portion, and the appearance is poor. On the other hand, such a problem does not occur in the present embodiment.

  In FIG. 6, the left end of the corrugated tube 40 is omitted for the sake of drawing, but the notches 42 may be formed at both ends of the corrugated tube 40 or one end. It may be formed only on the part.

[Fifth Embodiment]
FIG. 8 is a schematic partial cross-sectional view showing the wire protection structure according to the fifth embodiment. This electric wire protection structure is a structure for protecting the electric wire 1 such as a wire harness or a power cable accommodated in the corrugated tube 50.

  In FIG. 8, a corrugated tube 50 is a flexible bellows-like tube in which a slit 51 is formed over the entire length in the axial direction.

  The electric wire protection structure includes a first adhesive tape 53 attached to the outer periphery of the end portion of the corrugated tube 50 so as to straddle the slit 51. A part 53 a of the first adhesive tape 53 enters the corrugated tube 50 from the slit 51 and is interposed between the corrugated tube 50 and the electric wire 1.

  Further, the electric wire protection structure spans the slit 51 on the outer periphery of the corrugated tube 50 so that the state in which the portion 53a of the first adhesive tape 53 is interposed between the corrugated tube 50 and the electric wire 1 is maintained. It has the 2nd adhesive tape 54 affixed in this way.

  FIG. 9 is a schematic diagram illustrating a method for manufacturing the wire protection structure according to the present embodiment. Hereinafter, with reference to FIG. 9, the manufacturing method of the protection structure of the electric wire which concerns on this Embodiment is demonstrated.

  As shown in FIG. 9, in the first step, the first adhesive tape 53 is stuck on the outer periphery of the end portion of the corrugated tube 50 so as to straddle the slit 51 in a state where the end portion of the slit 51 is widened.

  Next, in the second step, the slit 51 of the corrugated tube 50 is closed while a part 53 a of the first adhesive tape 53 positioned in the slit 51 is slackened and pushed into the corrugated tube 50.

  Next, in the third step, the second adhesive tape 54 is applied from above the first adhesive tape 53 so as to straddle the slit 51 on the outer periphery of the end portion of the corrugated tube 50, and the slit 51 is closed. The corrugated tube 50 is fixed to

  As described above, in the present embodiment, the protection structure of the electric wire accommodated in the corrugated tube is the first adhesive tape attached to the outer periphery of the end portion of the corrugated tube so as to straddle the slit, A part of the first adhesive tape enters the inside of the corrugated tube from the slit and is interposed between the corrugated tube and the electric wire, and a part of the first adhesive tape is formed between the corrugated tube and the electric wire. It has the 2nd adhesive tape affixed so that the slit may be straddled on the outer periphery of a corrugated tube so that the state interposed in between may be maintained. For this reason, according to the present embodiment, the end adjacent to the slit of the corrugated tube can be floated from the inner electric wire with a simple configuration, and the electric wire by the end adjacent to the slit of the corrugated tube can be manufactured at low cost. Can be prevented or reduced. For example, in the present embodiment, an additional part such as the end cap described in Patent Document 3 is unnecessary, and therefore, damage to the wire is prevented or reduced at a lower cost than the technique described in Patent Document 3. be able to.

  In addition, the said protection structure of an electric wire may be provided in the edge part of the both sides of a corrugated tube, and may be provided only in the edge part of one side. Moreover, the said protection structure of an electric wire may be manufactured by methods other than the above-mentioned manufacturing method.

[Sixth Embodiment]
FIG. 10 is a schematic partial cross-sectional view showing the wire protection structure according to the sixth embodiment. This electric wire protection structure is a structure for protecting the electric wire 1 such as a wire harness or a power cable accommodated in the corrugated tube 60.

  In FIG. 10, a corrugated tube 60 is a flexible bellows-like tube in which a slit 61 is formed over the entire length in the axial direction.

  The protective structure of the electric wire has a coating 63 which is attached to a position where the end adjacent to the slit 61 of the corrugated tube 60 hits the surface of the electric wire 1 to prevent the end from contacting the electric wire 1 directly. . This film 63 is preferably affixed in a limited manner to the position where the above-mentioned end portion hits the surface of the electric wire 1.

  In a preferred embodiment, as shown in FIG. 10, a film 63 having excellent tear strength is attached to the surface of the electric wire 1 via a fluid adhesive material 64 such as a fluid adhesive resin. However, the material of the film 63 and the structure to which the film 63 is affixed may be appropriately set from the viewpoint of preventing or reducing damage to the electric wire 1 due to the end adjacent to the slit of the corrugated tube 60.

  Thus, in this Embodiment, the protection structure of an electric wire is that the said edge part stuck on the position where the edge part adjacent to the slit of a corrugated tube hits the surface of an electric wire directly contacts an electric wire. Have a coating to avoid. For this reason, according to the present embodiment, it is possible to avoid the end portion adjacent to the slit of the corrugated tube from coming into direct contact with the electric wire with a simple configuration, and the end adjacent to the slit of the corrugated tube at low cost. It becomes possible to prevent or reduce the damage of the electric wire by the part. For example, in this embodiment, it is only necessary to affix a film, so compared with the technique described in Patent Document 4 in which a cover that is a resin molded part needs to be in contact with a wire harness and fixed with a tape, Electric wire damage can be prevented or reduced at low cost.

  Moreover, according to the structure by which a membrane | film | coat is affixed via a fluid adhesive substance, the damage | wound of an electric wire can be prevented by wrapping the edge of the edge part of a corrugated tube with a membrane | film | coat.

  In addition, the said protection structure of an electric wire may be provided in the edge part of the both sides of a corrugated tube, and may be provided only in the edge part of one side.

  In addition, this invention is not limited to the said embodiment, It can change variously within the range which does not deviate from the summary of this invention.

It is a schematic side view which shows the structure of the corrugated tube which concerns on 1st Embodiment. It is a schematic side view which shows the structure of the corrugated tube which concerns on 2nd Embodiment. It is a schematic side view which shows the structure of the corrugated tube which concerns on 3rd Embodiment. It is the schematic which shows an example of the formation method of the shape of the edge part of the corrugated tube which concerns on 3rd Embodiment. It is AA sectional drawing of FIG. It is a schematic side view which shows the structure of the corrugated tube which concerns on 4th Embodiment. It is a schematic side view of the corrugated tube described in Patent Document 2 before and after being assembled to a vehicle or the like. It is a general | schematic fragmentary sectional view which shows the protection structure of the electric wire which concerns on 5th Embodiment. It is the schematic which shows the manufacturing method of the protection structure of the electric wire which concerns on 5th Embodiment. It is a general | schematic fragmentary sectional view which shows the protection structure of the electric wire which concerns on 6th Embodiment.

Explanation of symbols

  1 electric wire 10, 20, 30, 40, 50, 60 corrugated tube, 11, 41, 51, 61 slit, 11a end of slit, 12 end of corrugated tube, 42 notch, 53 first adhesive tape, 53a Part of the first adhesive tape, 54 Second adhesive tape, 63 film, 64 fluid adhesive.

Claims (7)

A corrugated tube in which a slit is formed over the entire length in the axial direction,
The corrugated tube, wherein an end of the slit is formed in a shape that widens toward the end of the corrugated tube. The corrugated tube according to claim 1,
The shape of the end of the slit is formed by cutting the end of the tube. The corrugated tube according to claim 1,
The shape of the end portion of the slit is formed by bending the end portion of the tube having a cut at least at the end portion outward from the cut. The corrugated tube according to claim 1,
The shape of the end of the slit is formed by heating and melting the end of the tube. A corrugated tube in which a slit is formed over the entire length in the axial direction,
The corrugated tube, wherein at least one circumferential cut is formed in the vicinity of the end of the slit of the corrugated tube. A protective structure for protecting an electric wire housed in a corrugated tube in which a slit is formed over the entire length in the axial direction,
It is the 1st adhesive tape affixed on the outer periphery of the end of the corrugated tube so as to straddle the slit, and a part of the first adhesive tape enters the corrugated tube from the slit, and A first adhesive tape interposed between the corrugated tube and the electric wire;
A second adhesive attached to the outer periphery of the corrugated tube so as to straddle the slit so as to maintain a state in which a part of the first adhesive tape is interposed between the corrugated tube and the electric wire. With tape,
An electrical wire protection structure characterized by comprising: A protective structure for protecting an electric wire housed in a corrugated tube in which a slit is formed over the entire length in the axial direction,
Protecting the electric wire, characterized in that the electric wire has a coating that is attached to a position where the end adjacent to the slit of the corrugated tube hits the surface of the electric wire to prevent the end from directly contacting the electric wire. Construction.

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