JP2018074771A - Protective structure of wiring harness and assembly method of protective structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a slit of s corrugate tube exterior to a wire harness from being opened.SOLUTION: Split end faces of a slit extending in a lengthwise direction of a corrugate tube inserted through a wire harness are bonded to each other with an adhesive, and adhesive tape is spirally wound so as to cover an outer peripheral surface of a bonded portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a protective structure for a wire harness and a method for assembling the protective structure, and more particularly, in a protective structure in which a wire harness in which electric wires arranged in a vehicle such as an automobile are converged is covered with a corrugated tube with a slit. This prevents the opening of the slits and prevents the electric wires from protruding from the slits.

  In many cases, wire harnesses routed in an engine room or the like of an automobile have a corrugated tube made of resin for the purpose of converging protection of a group of wires, preventing interference from other members, dust prevention, waterproofing, and the like. A corrugated tube provided with annular crests and troughs alternately in the length direction is suitably used as an exterior material for a wire harness because it has flexibility and stretchability. A corrugated tube with a slit in which one slit is extended over the entire length is widely used so that the electric wire group can be easily inserted into the corrugated tube. The corrugated tube with a slit has an advantage that the wire harness can be put sideways while the slit is opened and the workability is good. However, when the corrugated tube is routed in the vehicle in a bent state, the slit of the corrugated tube is opened, and the internal electric wire tends to protrude outside through the slit. Further, in the crossover region in the engine room, the electric wire tends to protrude from the slit when vehicle vibration occurs. Thus, when an electric wire protrudes from a slit, there exists a possibility of damaging an electric wire with the edge of the division | segmentation end which pinches | interposes a slit, and there exists a possibility that the electric wire which protruded may interfere with an external member, and an electric wire may be damaged.

In order to prevent the opening (breaking) of the slit of the corrugated tube, conventionally, as shown in FIG. 3, the slit 101 of the corrugated tube 100 is opened, and the electric wire group 120 constituting the wire harness is inserted into the corrugated tube 100. Later, the adhesive tape 110 is often wound around the outer peripheral surface of the corrugated tube 100.
However, simply by winding the adhesive tape 110, the slit 101 opens when an external force such as twisting is applied, and the electric wire easily protrudes from the slit 101.

  In order to solve the above problem, Japanese Patent Application Laid-Open No. 2015-202037 provides a structure for closing the slit. In this structure, as shown in FIGS. 4A and 4B, the conductive ink 130 is applied to at least one of the separation end faces 102 and 103 sandwiching the slit 101 of the corrugated tube 100, and a magnetic field is applied to the conductive ink 130. Is heated to melt the separation end faces, thereby fusing the separation end faces together and closing the slit 101.

Japanese Patent Laying-Open No. 2015-202037

  In the structure of Patent Document 1, the conductive ink 130 is heated by applying a magnetic field after applying the conductive ink to the end face of the slit of the corrugated tube. This heating needs to be heated to a temperature at which the separation end faces of the slit are fused. Since this operation is performed in a state where the electric wire group is passed through the corrugated tube, heat generation may occur in the internal electric wire group when the heat is generated to the extent that the split end face of the slit is melted. In addition, it is necessary to apply a magnetic field to the divided end faces and then generate heat by applying a conductive ink to melt the divided end faces while simultaneously bringing the divided end faces into contact with each other and fusing them. And this operation | work must be performed continuously, shifting in the length direction along a slit. At that time, it is necessary to perform the process with care so as not to cause twisting, which is a difficult task and a problem of poor workability. In addition, when an external force such as torsion is applied, a separating force may act on the fused divided end surfaces to open the slit.

  This invention is made | formed in view of the said problem, and makes it the subject to set it as the structure which can prevent the opening of the slit of the corrugated tube which penetrated the wire harness easily and reliably.

  In order to solve the above-described problems, the present invention provides a method in which the split end faces of the slit extending in the length direction of the corrugated tube through which the wire harness is inserted are bonded to each other with an adhesive, and the outer periphery of the bonded portion. Provided is a protective structure for a wire harness in which an adhesive tape is spirally wound so as to cover the surface.

  As described above, in the present invention, the split end faces sandwiching the slit of the corrugated tube are bonded with an adhesive and the slit is closed by chemical bonding, and the adhesive tape is wound around the outer periphery and fastened, and the slit is mechanically bonded. Is closed. In this way, not only the bonding by the adhesive but also the outer peripheral surface is fastened with the adhesive tape so that the bonding portion by the adhesive does not come off, so that the opening of the slit can be reliably prevented. Therefore, even if the corrugated tube is bent corresponding to the wiring state of the wire harness, the slit can be prevented from opening (breaking), and the electric wire can be prevented from protruding from the slit. And since the adhesive which closes a slit is hidden with an adhesive tape, appearance is not impaired.

It is preferable that the bonding by the adhesive is performed at intervals in the length direction, and the adhesive tape is wound by wrapping or rough winding in a state of covering the bonding portion by the adhesive.
The adhesive is applied at intervals of 30 mm to 70 mm, preferably about 50 mm.
Wrap the adhesive tape without any gaps to improve waterproof and dustproof performance, and suitable protection for wire harnesses routed in the engine room, which is an inundated area outside where there is water splashing from under the vehicle and water splashing during car washing. It becomes a structure.
On the other hand, in the case of wiring in a vehicle compartment or the like, if the adhesive tape is rolled roughly, it can be manufactured at a lower cost.

  In the wire harness protection structure of the present invention, the wire harness wire group is inserted into the slit corrugated tube, and then the adhesive is dropped and applied to the slit at intervals in the length direction. It is preferable to assemble the adhesive tape in a spiral shape so as to cover the application part of the adhesive before the agent is cured.

When the adhesive is continuously applied to the entire length of the slit without any gap, it is necessary to continuously perform the application operation while shifting the applicator in the slit length direction (lateral direction). At that time, it is not easy to hold the corrugated tube with care so as not to twist it and to move it sideways while applying a fixed amount of adhesive. Therefore, work time is required, workability is poor, and necessary adhesive is increased, resulting in high cost.
On the other hand, in the present invention, as described above, since the adhesive is dropped and applied at intervals to the slit, the adhesive can be applied at the intended position, and the workability is good, so there are few failures. Yield can be increased. In addition, the required amount of adhesive can be reduced, the curing time of the adhesive can be shortened, and the working time can be shortened.

  Furthermore, when the adhesive tape is wound before the adhesive is cured, the divided end surfaces sandwiching the adhesive dropped in the slit can be strongly bonded, and the divided end surfaces can be firmly bonded with the adhesive. And even if a lateral shift has occurred on the divided end faces, it can be corrected by wrapping the adhesive tape, and can be bonded without misalignment with an adhesive that cures the divided end faces. Furthermore, it is not necessary to hold the corrugated tube in a mounted state until the adhesive is cured, and work efficiency can be improved.

  As described above, in the wire harness protection structure of the present invention, the slit of the corrugated tube with a slit to be sheathed on the wire harness is closed by chemical bonding with an adhesive, and the adhesive tape covers the bonding portion by the adhesive Since it is fastened so that the bonded portion by the adhesive is not removed, the opening (breaking) of the slit can be surely prevented. Therefore, it is possible to prevent the slit from being opened at the bent wiring location of the wire harness, and it is also possible to prevent the corrugated tube from swinging due to vehicle vibration and the slit from being opened. As a result, it is possible to prevent the electric wire from protruding from the open slit and causing damage to the electric wire.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiment of this invention is shown, (A) is a perspective view, (B) is a principal part expanded sectional view of (A), (C) is an enlarged view which shows the state which plugs up a slit with an adhesive agent. (A), (B), and (C) are drawings showing the assembly method of the embodiment. It is a perspective view which shows a prior art example. (A) and (B) are perspective views showing other conventional examples.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The wire harness of the embodiment is routed in an engine room of an automobile, and a wire harness 1 composed of a plurality of electric wires W is covered with a corrugated tube 2 with slits. The corrugated tube 2 is a commonly used corrugated tube, which is continuously extruded with a resin such as polypropylene, and has annular crests 2a and troughs 2b alternately in the length direction L. In the corrugated tube 2, one slit 3 extends over the entire length. The slit 3 is provided with a jig when the wire harness is passed through the corrugated tube 2 so that the wire harness 2 can be laterally inserted from the side.

  The corrugated tube 2 having the wire harness 1 penetrated therein is bonded with an adhesive 5 with a predetermined interval (50 mm in the present embodiment) between the divided end faces 2e and 2f sandwiching the slit 3 in the length direction. And the adhesive tape 7 is wrapped around the outer peripheral surface of the corrugated tube 2 without leaving a gap, and is wound spirally. That is, the slit 3 is chemically bonded with the adhesive 5 with an interval of 50 mm, and the slit 3 is bonded with a mechanical fastening force by winding the adhesive tape 7 on the outer peripheral surface. The connection by is not disengaged.

  The slit 3 is closed by the adhesive 5 and the adhesive tape 7 according to the procedure shown in FIG. First, as shown in FIG. 2A, the wire group of the wire harness 1 is inserted into the corrugated tube 2 while opening the slit 3 of the corrugated tube 2 with a jig (not shown).

  Next, as shown in FIG. 2 (B), an operator holds the applicator 9 filled with the adhesive 5 in a state where the corrugated tube 2 is held in a straight line so that the corrugated tube 2 is not twisted, and the slit 3 has a thickness of 50 mm. A predetermined amount of the adhesive 5 is dropped at intervals. At that time, when the divided end surfaces 2e and 2f sandwiching the slit 3 are opened at the dropping position of the adhesive 5, the slit 3 is closed in a closing direction so that the adhesive is applied to at least one of the divided end surfaces 2e and 2f. Apply adhesive while pressing. The adhesive 5 has a viscosity that does not flow into the inside from the slit 3.

  Next, while the adhesive 5 is not cured, as shown in FIG. 2 (C), the adhesive tape 7 is wrapped around the outer peripheral surface of the corrugated tube 2 so that there is no gap, and is wound spirally. At that time, the split end faces 2e and 2f sandwiching the slit 3 are fastened so as to be joined without lateral displacement. Thus, by winding the adhesive tape 7, the adhesive 5 is reliably sandwiched between the divided end faces 2 e and 2 f and covered with the adhesive tape 7 at the dropping portion of the adhesive 5.

  Thus, since the adhesive tape 7 is wound and fastened so as not to open the slit 3, it can be taken out from the assembly work table (not shown) before the adhesive 5 is cured, thereby improving the work efficiency. . And even if the joint location by the adhesive agent 5 is provided not at full length but at intervals, since the joint location by this adhesive agent is fastened with the adhesive tape 7, the adhesive agent 5 is not peeled off and the slit 3 Opening can be reliably prevented.

  In the protective structure of the wire harness shown in FIG. 1 assembled in the above procedure, the split end faces 2e and 2f sandwiching the slit 3 of the corrugated tube 2 are not opened by the bonding by the adhesive 5 and the fastening by the winding of the adhesive tape 7. Therefore, it does not open even if the slit 3 is located on the outer peripheral side at the bent portion, it does not open even if it is swung by vehicle vibration, and it does not open even when an external load such as torsion is applied. As a result, the internal electric wire protrudes from the open slit 3, and the electric wire is not damaged at the edge of the divided end face, and it is possible to prevent the outer member and the electric wire from interfering with each other and causing damage.

In addition, although it is preferable to apply | coat the adhesive agent 5 at intervals, when the length of a corrugated tube is comparatively short, you may couple | bond the full length of the slit 3 with an adhesive agent.
In addition, in a wire harness that is not routed in a submerged area outside the automobile, the adhesive tape may be covered with the adhesive tape, and the adhesive tape may be wrapped roughly without being wrapped.

1 Wire harness 2 Corrugated tube 3 Slit 5 Adhesive 7 Adhesive tape

Claims (3)

  The split end faces of the slit extending in the length direction of the corrugated tube passing through the wire harness are bonded with an adhesive, and the adhesive tape is spirally formed so as to cover the outer peripheral surface of the bonded portion. Wound wire harness protection structure.   The wire harness according to claim 1, wherein the bonding by the adhesive is performed at intervals in the length direction, and the winding of the adhesive tape is performed by wrapping or rough winding in a state of covering the bonding portion by the adhesive. Protective structure.   The protective structure of the wire harness according to claim 2, after inserting the wire group of the wire harness into the corrugated tube with slits, the adhesive is dropped and applied to the slits at intervals in the length direction. A method of assembling a protective structure for a wire harness in which the adhesive tape is wound spirally so as to cover an application portion of the adhesive before the adhesive is cured.

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