JP2013192343A - Water cutoff processing method and water cutoff processing structure of wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cutoff processing method and a water cutoff processing structure of a wire harness, in which high water cutoff effects can be ensured easily.SOLUTION: A water cutoff processing method includes a winding step for winding a tape-like water cutoff material 22 at a predetermined position of each cable 12 constituting a bundle of cables 12 of a wire harness 11, a fusing step for fusing the water cutoff materials 22 of the cables 12 to each other to provide an integrated water cutoff processed part 21, and an inserting step for inserting the bundle of cables 12 through a wire harness perforated part formed in a grommet to dispose the water cutoff processed part 21 in the wire harness perforated part. In the winding step, the water cutoff material 22 is used with which self-fusing materials 24 are provided on front and rear sides of a sheet 23.

Description

  The present invention relates to, for example, a water stop treatment method and a water stop treatment structure for a wire harness routed in an automobile.

  Conventionally, grommets have been used to route a wiring harness from the engine room of an automobile to the passenger compartment. This grommet allows a wire harness to pass through a panel that partitions an engine room and a vehicle interior. Usually, the water harness penetration part penetrated by the wire harness in this grommet is subjected to water stop treatment.

  As a method of this type of water stop treatment, for example, a water-resistant tape is wrapped around each wire at the wire harness penetration portion to stop water, or a seal material is filled or applied to stop the wire harness penetration portion. Is known (see, for example, Patent Documents 1 to 6).

JP 2009-291021 A Japanese Patent Laid-Open No. 62-222515 JP-A-6-150757 JP 2009-38882 A JP-A-7-212468 JP 2003-16859 A

  By the way, as shown in FIG.9 and FIG.10, in the water stop process part in which the water stop process in the wire harness penetration part of the above grommet was performed, the clearance gap between the electric wires 1 and the usage-amount of the water stop material 2 are shown. If management is not strict, when pressure is applied to the water stop treatment part, the electric wires 1 come close to each other, the water stop material 2 is pushed out from the gap between the electric wires 1, and the water stop effect by the water stop material 2 is weakened. End up. For example, when a tightening force such as a grommet is applied and the electric wires 1 come into contact with each other, as shown in FIGS. 9 and 10, the water stop material 2 does not intervene at the contact portion 25 between the electric wires 1 and a gap is formed. Water leakage or air leakage occurs between the electric wires 1.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the water-stop treatment method and water-stop treatment structure of a wire harness which can ensure the high water-stop effect easily. is there.

In order to achieve the above-described object, the water-stop treatment method for a wire harness according to the present invention is characterized by the following (1) or (2).
(1) A winding step of winding a tape-like water-stopping material provided with a self-bonding material on the front and back of the sheet at a predetermined position of each electric wire constituting the wire bundle of the wire harness,
A fusion process for making the water stop treatment unit integrated by fusing the water stop materials of each wire together;
An insertion step of inserting the wire bundle into a through portion formed in the grommet and arranging the water stop treatment portion in the through portion.
(2) A water-stop treatment method for a wire harness having the configuration of (1) above,
In the insertion step, the water stop processing part of the wire bundle is stored in a storage part formed in the penetrating part with a larger diameter than other parts.

In the water stopping method for the wire harness having the configuration of (1) above, the water stopping materials wound around the electric wires are fused and integrated with each other, so that the electric wires are stopped with a high water stopping effect without gaps. be able to.
Even if a large pressure is applied from the outer peripheral side when the water-stopping treatment part in which the water-stopping materials are fused to each other is inserted through the grommet penetration part, the water-stopping material provided with self-fusing material on the front and back of the sheet Therefore, the self-bonding material on the inner peripheral side of the sheet is held inside the sheet. As a result, since the self-bonding material on the inner periphery side of the sheet is always located so as to cover the outer periphery of the electric wire, it is possible to prevent a problem that all the self-bonding materials are not pushed out from between the electric wires, A good water stop state can be maintained.
In the water-stop treatment method for the wire harness having the configuration of (2) above, the water-stopping materials wound around the electric wires are fused and integrated with each other, so that the electric wires are water-stopped with a high water-stopping effect without gaps. be able to.
In addition, since the water-stopping treatment part in which the water-stopping materials are fused is stored in the storage part provided in the grommet penetration part, excessive pressure is applied from the outer peripheral side even if it is inserted through the grommet penetration part. Can be eliminated. Therefore, it is possible to prevent a problem that all the fusion material is not pushed out from the periphery of the electric wire, and it is possible to maintain a good water stop state.

Moreover, in order to achieve the objective mentioned above, the water stop processing structure of the wire harness which concerns on this invention is characterized by the following (3) or (4).
(3) A tape-like water stop material is wound around a predetermined position of each electric wire constituting the electric wire bundle of the wire harness,
The water stop material of each electric wire is fused to each other and integrated into a water stop treatment unit,
The wire bundle is inserted into the through part formed in the grommet, and the water stop treatment part is arranged in the through part,
The water stop material is provided with a self-bonding material on the front and back of the sheet.
(4) A water-stopping structure for a wire harness configured as described in (3) above,
A storage part formed in a large diameter is provided in the penetration part, and the water stop processing part of the wire bundle is stored in the storage part.

In the water-stopping treatment structure for the wire harness having the configuration (3), the water-stopping materials wound around the electric wires are fused and integrated with each other. Can be water.
Even if a large pressure is applied from the outer peripheral side when the water-stopping treatment part in which the water-stopping materials are fused to each other is inserted through the penetration part of the grommet, Since the material is used, the self-bonding material on the inner peripheral side of the sheet is held inside the sheet. As a result, since the self-bonding material on the inner periphery side of the sheet is always located so as to cover the outer periphery of the electric wire, it is possible to prevent a problem that all the self-bonding materials are not pushed out from between the electric wires, A good water stop state can be maintained.
In the waterproofing structure for a wire harness configured as described in (4) above, the waterproofing members wound around the wires are fused and integrated with each other, so that the wires can be stopped with a high waterproofing effect without any gaps. Can be water.
In addition, since the water-stopping treatment part where the water-stopping materials are fused together is stored in the storage part provided in the grommet penetration part, excessive pressure is applied from the outer peripheral side even if it is inserted through the grommet penetration part. It can be eliminated. Therefore, it is possible to prevent a problem that all the fusion material is not pushed out from the periphery of the electric wire, and it is possible to maintain a good water stop state.

  ADVANTAGE OF THE INVENTION According to this invention, the water stop processing method and water stop processing structure of a wire harness which can ensure the high water stop effect easily can be provided.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing a state in which a water-stopping treatment part of a wire harness for explaining the first embodiment is inserted through a wire harness penetration part of a grommet. FIG. 2 is a perspective view of a water stop treatment part of the wire harness. FIG. 3 is a cross-sectional view of a water stop treatment section of the wire harness. FIG. 4 is a perspective view of an electric wire around which a waterstop material is wound. FIG. 5 is a cross-sectional view of a water stop material wound around an electric wire. FIG. 6 is a cross-sectional view of a state in which electric wires wound with a water stop material are bundled. FIG. 7 is a perspective view of the electric wire in a state where the water stop treatment unit is disassembled. FIG. 8: is a longitudinal cross-sectional view which shows the state which inserted the water stop process part of the wire harness explaining 2nd Embodiment in the wire harness penetration part of a grommet. FIG. 9 is a perspective view of an electric wire in a state where a conventional water stop treatment unit is disassembled. FIG. 10 is a cross-sectional view taken along line XX in FIG. 9.

Hereinafter, a water-stop treatment method and a water-stop treatment structure of a wire harness according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
First, the first embodiment will be described.

  FIG. 1 is a longitudinal sectional view showing a state in which a water-stop treatment part of a wire harness for explaining the first embodiment is inserted into a wire harness penetration part of a grommet, and FIG. 2 is a perspective view of the water-stop treatment part of the wire harness, 3 is a cross-sectional view of a water-stop treatment section of the wire harness, FIG. 4 is a perspective view of an electric wire around which the water-stop material is wound, FIG. 5 is a cross-sectional view of the water-stop material wound around the electric wire, and FIG. Sectional drawing of the state which bundled the electric wire by which the water material was wound, FIG. 7 is a perspective view of the electric wire in the state which decomposed | disassembled the water stop process part.

  As shown in FIG. 1, the wire harness 11 has a plurality of electric wires 12. These electric wires 12 are obtained by covering a conductor with a jacket made of a synthetic resin, and a plurality of wires are bundled to constitute a wire harness 11.

  For example, the wire harness 11 is routed from an engine room of an automobile to a vehicle interior, and is passed through a hole 13a formed in a panel 13 that partitions the engine room and the vehicle interior. A grommet 14 made of rubber or the like is attached to the wire harness 11. The grommet 14 has a wire harness penetration part 15 formed in a cylindrical shape, and the wire harness 11 is inserted through the wire harness penetration part 15. The grommet 14 has a panel mounting portion 16 that gradually increases in diameter from the wire harness penetration portion 15 side. A groove 16a is formed in the panel mounting portion 16 in the circumferential direction, and the edge of the hole 13a of the panel 13 enters the groove 16a so that the grommet 14 is mounted on the panel 13 in a watertight manner. The

  The wire harness 11 has the water stop process part 21 in which the water stop process was performed. As for the wire harness 11 inserted in the wire harness penetration part 15 of the grommet 14, the water stop process part 21 is arrange | positioned inside the wire harness penetration part 15. FIG.

  As shown in FIG.2 and FIG.3, in the water stop processing part 21 of the wire harness 11, the water stop material 22 is provided around each electric wire 12, and the water stop materials 22 of each electric wire 12 are mutually without gaps. It is fused.

  Thus, the water-stopping treatment part 21 in which the water-stopping materials 22 are fused without gaps is inserted into the wire harness penetration part 15 of the grommet 14, and the water-proofing material 22 on the outermost periphery is inserted into the wire harness penetration part 15. It is fused to the inner peripheral surface of the no gap. Thereby, the wire harness 11 is reliably stopped at the wire harness penetration part 15 of the grommet 14.

  Next, a method for applying a water stop treatment to the wire harness 11 will be described.

  First, as shown in FIG. 4, the waterproof material 22 formed in a tape shape is wound around each electric wire 12 at a predetermined position of each electric wire 12 of the wire harness 11 (winding step).

  Here, the configuration of the water blocking material 22 will be described in detail. As shown in FIGS. 3 and 5, the water stop material 22 includes three layers of a sheet 23 and a self-bonding material 24 provided on the front and back of the sheet 23. The sheet 23 is made of a flexible sheet such as a non-woven fabric. A self-bonding material 24 having a self-bonding property that is fused by being pressed against each other is provided on the front and back of the sheet 23. Note that the thickness of the sheet 23 is extremely thin compared to the self-bonding material 24. For this reason, although the layer of the sheet | seat 23 is not described in sectional drawing of the water stop process part 21 shown in FIG.3 and FIG.6, it should be noted that the sheet | seat is located between the two layers self-bonding material 24. I want to be.

  Next, as shown in FIG. 6, the electric wires 12 wound with the water stop material 22 are bundled, and the water stop processing portion 21 is inserted through the wire harness penetration portion 15 of the grommet 14 (fusion process, insertion process).

  The inner diameter of the wire harness penetrating portion 15 is smaller than the outer diameter of the portion where the water blocking material 22 is wound around each electric wire 12 of the wire harness 11. Therefore, when the electric wires 12 are bundled and inserted through the wire harness penetration part 15 of the grommet 14, pressure is applied to the mounting position of the water blocking material 22 from the outer peripheral side by the wire harness penetration part 15. In addition, although this embodiment demonstrates the structure which the elastic force which arises in the wire harness penetration part 15 of the grommet 14 acts on the water stop process part 21, the bundle | flux of the electric wire 12 is inserted in the wire harness penetration part 15, and water stop is carried out. The configuration may be such that an external force acts on the water stop treatment portion 21 by applying pressure to the outer peripheral side of the wire harness penetration portion 15 after arranging the mounting location of the material 22.

  By the way, as shown in FIG. 6, the water-stopping material 22 has the gap G formed between the water-stopping materials 22 only by bundling the electric wires 12, and a reliable sealing state cannot be obtained.

  However, when the bundle of the electric wires 12 is inserted into the wire harness penetrating portion 15 and the mounting position of the water stopping material 22 is arranged, the water stopping material 22 wound around each electric wire 12 with the pressure applied by the wire harness penetrating portion 15 The self-bonding materials 24 on the outer peripheral side of the sheet 23 are fused to each other. Therefore, the gap G between the water blocking materials 22 disappears, and the water blocking materials 22 of the electric wires 12 are in close contact with each other without a gap. Further, in the periphery of the bundle of the electric wires 12, the water stop material 22 is fused to the inner peripheral surface of the wire harness penetration portion 15, so that the gap between the circumference of the bundle of the wire harness 11 and the wire harness penetration portion 15 is also formed. Adhere closely.

  At this time, since the water-stopping material 22 is provided with the self-bonding material 24 on the front and back of the sheet 23, the self-bonding material 24 on the inner peripheral side of the sheet 23 maintains a state of covering the periphery of the electric wire 12. Will be. Therefore, even if an excessive pressure is applied to eliminate the gap G between the water stop materials 22, the self-bonding material 24 on the inner peripheral side of the sheet 23 is pressed inside the sheet 23. . As a result, since the self-bonding material 24 on the inner peripheral side of the sheet 23 is always positioned so as to cover the outer periphery of the electric wire 12, the problem that all the self-bonding material 24 is not pushed out from between the electric wires 12 is suppressed. Is done.

  FIG. 7 is a view showing a state in which the water stop treatment portion 21 of the wire harness 11 subjected to the water stop treatment described above is taken out from the wire harness penetration portion 15 and the electric wires 12 are separated. As shown in FIG. 7, it was confirmed that a water-stopping material 22 remained around each electric wire 12 and a good water-stopping effect was obtained.

  Thus, according to the water-stop treatment method and the water-stop treatment structure of the wire harness according to the first embodiment, the water-stop materials 22 wound around the electric wires 12 are fused and integrated with each other, The electric wires 12 can be stopped with a high water stop effect without any gap.

  Even when a large pressure is applied from the outer peripheral side when the water-stopping treatment part 21 to which the water-stopping materials 22 are fused is inserted into the wire harness penetration part 15 of the grommet 14, it is self-fusing to the front and back of the sheet 23. Since the waterstop material 22 provided with the material 24 is used, the self-fusion material 24 on the inner peripheral side of the sheet 23 is pressed inside the sheet 23. Therefore, it is possible to prevent a problem that all the self-bonding materials 24 are not pushed out from between the electric wires 12 and maintain a good water-stopping state. Further, since the gap G can be completely closed, airtightness can be ensured.

  In addition, since there is a sheet 23 such as a non-woven fabric between the self-bonding material 24, unnecessary stretch and dripping of the water stop material 22 can be eliminated. Thereby, it becomes possible to wind the water stop material 22 around the electric wire 12 easily, and it can be made suitable for automation.

  Further, by adjusting the thickness of the self-bonding material 24 with the sheet 23 as a boundary, it is possible to deal with the gap G between the water stop materials 22 that differ depending on the thickness of the electric wire 12 and the combination of the electric wires 12 of each diameter.

  In addition, as the water stop material 22, not only a water-resistant rubber-like elastic base material but the double-sided tape etc. which have an adhesive on the front and back can also be used.

(Second Embodiment)
Next, a second embodiment will be described.
In addition, the same component as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  FIG. 8: is a longitudinal cross-sectional view which shows the state which inserted the water stop process part of the wire harness explaining 2nd Embodiment in the wire harness penetration part of a grommet.

  As shown in FIG. 8, in the second embodiment, a storage part 41 is formed in the wire harness penetration part 15 of the grommet 14. The storage portion 41 is formed in a cylindrical shape having a larger diameter than other portions in the wire harness penetration portion 15, and the water stop treatment described in the first embodiment is performed in the storage portion 41. In addition, the water stop portion 21 of the wire harness 11 can be stored. The method of applying a water stop treatment to the wire harness 11 in the second embodiment is different in the insertion process compared to the first embodiment. That is, in the insertion process, the wire harness 11 that has been subjected to water stop treatment with the water stop material 22 is inserted into the wire harness penetration part 15 of the grommet 14, and the water stop treatment part 21 is inserted into the storage part 41 of the wire harness penetration part 15. Store.

  In 1st Embodiment mentioned above, about the water stop processing structure which can prevent the malfunction that all the self-bonding materials 24 are extruded from between the electric wires 12, and can maintain a favorable water stop state. explained. However, although the water stop treatment part 21 can withstand the excessive pressure applied from the outer peripheral side when the grommet 14 is inserted through the wire harness penetration part 15, the water stop treatment part 21 has an allowable pressure. There is a limit determined by the durability of the sheet 23. For this reason, it is preferable that the water stop process part 21 is provided with the pressure within the allowable range.

  Therefore, in the second embodiment, by appropriately adjusting the inner diameter of the storage portion 41 formed in the wire harness penetration portion 15 to a preferable one, the water stoppage from the outer peripheral side when the grommet 14 is inserted into the wire harness penetration portion 15. The pressure applied to the processing unit 21 is made appropriate. Specifically, the inner diameter of the storage unit 41 in a state where the water stop processing unit 21 is not stored is smaller than the outer diameter of the water stop processing unit 21, and the water stop processing unit 21 is stored in the storage unit 41. The external force acting on the sheet 23 at the time is large enough to be less than the durability of the sheet 23.

  In 2nd Embodiment, the electric wires 12 and the electric wires 12 are made to cooperate by the storage part 41 in which the internal diameter was formed in this way, and the water stop process part 21 which demonstrated the structure in 1st Embodiment. -While stopping water between the wire harness penetration parts 15 with a high water-stopping effect without gaps, the water-stopping treatment part 21 is appropriately pressured without using a case where a pressure that is out of normal is applied. Can be granted.

  Here, the water stop processing part 21 is not excessively pressed by the wire harness penetration part 15 by being stored in the storage part 41. Therefore, even if the wire harness penetrating portion 15 is inserted, the water stop treatment portion 21 is excessively pressed by the wire harness penetrating portion 15 and all the self-bonding material 24 of the water stop material 22 is pushed out from the periphery of the electric wire 12. The trouble that disappears is prevented.

  By the way, when the wire harness 11 is inserted into the wire harness penetration part 15 where the storage part 41 is not provided and the water stop treatment part 21 is disposed in the wire harness penetration part 15, the water stop treatment part 21 has a wire harness penetration. The portion 15 can be overstressed. Then, in the water stop treatment unit 21 due to this compression, the sheet 23 is broken and the self-bonding material 24 of the water stop material 22 is not pushed out from between the electric wires 12, which may reduce the water stop effect.

  On the other hand, in 2nd Embodiment, the water stop process part 21 is not excessively pressed by the wire harness penetration part 15 because the water stop process part 21 is accommodated in the accommodating part 41, Therefore, In the water stop treatment unit 21, the water stop material 22 is maintained in a state where the water stop material 22 is fused to each other with an appropriate pressure, and the water stop material 22 remains around each electric wire 12 to obtain a good water stop effect. Can do.

  Thus, also in the case of 2nd Embodiment, the water stop materials 22 wound around each electric wire 12 are mutually united by fusing together, and water 12 can be water-stopped by the high water stop effect without gap. Can do.

  Further, the water-stopping treatment part 21 in which the water-stopping materials 22 are fused is stored in the storage part 41 provided in the wire harness penetration part 15 of the grommet 14, so that it is inserted into the wire harness penetration part 15 of the grommet 14. However, excessive pressure is not applied from the outer peripheral side. Therefore, the trouble that the sheet 23 is damaged and all the self-bonding material 24 is not pushed out from between the electric wires 12 can be prevented, and a good water stop state can be maintained.

  Moreover, since the location where the water blocking material 22 is wound around the electric wire 12 is passed through the wire harness penetrating portion 15, it is specified at a position where the water blocking material 22 can be stored in the storage portion 41. It becomes unnecessary. Therefore, it is possible to reduce the amount of the water-stopping material 22 used and to save space at the place where the water-stopping material 22 is wound.

  In the first and second embodiments, the self-fusing material 24 having the self-fusing property that is fused to each other by pressure is used as the fusing material of the water-stopping material 22. As the adhesion material, for example, a material having a heat fusion property that is fused to each other by heat such as hot melt may be used.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

11 Wire harness 12 Electric wire 14 Grommet 15 Wire harness penetration part (penetration part)
21 Water stop treatment part 22 Water stop material 23 Sheet 24 Self-fusion material (fusion material)
41 Storage section

Claims (4)

A winding step of winding a tape-like water-stopping material provided with a self-bonding material on the front and back of the sheet at a predetermined position of each electric wire constituting the electric wire bundle of the wire harness,
A fusion process for making the water stop treatment unit integrated by fusing the water stop materials of each wire together;
A water-stop treatment method for a wire harness, comprising: an insertion step of inserting the wire bundle into a penetration portion formed in a grommet and arranging the water-stop treatment portion in the penetration portion.   2. The wire harness according to claim 1, wherein in the insertion step, the water stop treatment part of the wire bundle is housed in a housing part having a diameter larger than that of the other part in the penetration part. Water stop treatment method. A tape-like water-stop material is wound around a predetermined position of each electric wire constituting the electric wire bundle of the wire harness,
The water stop material of each electric wire is fused to each other and integrated into a water stop treatment unit,
The wire bundle is inserted into the through part formed in the grommet, and the water stop treatment part is arranged in the through part,
The water-stopping structure for a wire harness, wherein the water-stopping material is provided with a self-bonding material on both sides of the sheet.   The wire harness stop according to claim 3, wherein a storage portion having a large diameter is provided in the penetration portion, and the water stop treatment portion of the wire bundle is stored in the storage portion. Water treatment structure.

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