JP5391773B2 - Line water stop method to wire harness - Google Patents

Description

  The present invention relates to a method for water-stopping a wire harness, and more particularly, to a water-stopping treatment for a wire harness inserted into a grommet to be mounted in a panel through hole of an automobile.

For example, when wiring a wire harness through a through-hole drilled in a panel that partitions an engine room and a vehicle compartment of a car, which is a flooded area, the wire harness is inserted into a grommet made of rubber or elastomer, and the grommet passes through the grommet. In addition to being attached to the hole, the wire harness at the part that is inserted through the grommet is subjected to inter-line water stop treatment, thereby preventing water from entering the passenger compartment.
When there is a gap between the wire harnesses of the wire harness that passes through the grommet and between the electric wire and the pipe part of the grommet, the line-to-line water stoppage causes water in the vehicle compartment from the engine room side through the gap. In order to seal these gaps, water-stopping treatment is performed by filling a water-stopping agent.

The present applicant has provided Unexamined-Japanese-Patent No. 2008-181815 (patent document 1) as the method of the water stop of this kind of wire harness between lines.
As shown in FIG. 10 (A), the water stop method first inserts and arranges the wires w constituting the wire harness W / H through the wiring jig 1 and then inserts the wire w in the wiring jig 1 into FIG. 10 (B). As shown, the nozzle 3 is moved upward from below to apply the water blocking agent 4 to the electric wire in the waterproof section x. After the application, as shown in FIG. 10C, the surface of the electric wire w is covered with the foamed sheet 5 coated with an adhesive, and the foamed sheet 5 is rolled up and the tape 6 is wound and fixed.
By inserting the water stop portion treated in this way into the grommet and bringing the water stop portion into close contact with the inner peripheral surface of the tube portion of the grommet, the gap between each wire of the wire harness that passes the grommet, and each The gap between the electric wire and the grommet inner peripheral surface is sealed.

  However, although this line-to-line waterproofing method has an advantage that it can be continuously performed on the assembly line of the wire harness, an operation of aligning the electric wires w in a line and a focusing operation using the sheet 5 and the tape 6 are required. Moreover, when the water-stopping agent 4 and the electric wire w are rounded using the foam sheet 5, there is a problem that the sheet is difficult to wind because the electric wire has irregularities.

JP 2008-181815 A

  This invention is made | formed in view of the said problem, and makes it the subject to provide the line water stop method of the wire harness which can reduce the number of line water stop man-hours, and can improve water stop performance.

In order to solve the above-mentioned problems, the present invention covers a group of electric wires constituting a wire harness by tape winding and concentrating, and a water stop portion is covered with a waterproof sheet and covered in a U shape with an upper surface opened without tape winding. ,
Insert and support the water stop point covered with the waterproof sheet in a U-shaped set jig placed in a pressurized container,
Applying a water stop agent to the upper surface of the wire group not covered with the waterproof sheet of the water stop point,
Subsequently, compressed air is introduced into the pressurized container and pressurized, and the water blocking agent is allowed to permeate into the wire group.
Then, the wire-to-line water stop method for the wire harness is provided, wherein the ends of both end portions of the U-shaped waterproof sheet are folded and covered on the upper surface of the electric wire group.

According to the wire harness water-stopping method of the present invention, the wire harness is inserted in the U-shaped set jig in a state of being preliminarily converged, and a water-stopping agent is applied by pressurization into the converged wire group. In order to infiltrate the water-stopping agent, there is no need for a step of inserting and aligning the wire group through the elongated hole of the wiring jig in order to apply the water-stopping agent, and the converging step of rounding off the water-stopping portion after filling with the water-stopping agent However, man-hours can be reduced and workability can be improved.
Moreover, since the electric wire group is taped beforehand, the unevenness | corrugation of an electric wire is lose | eliminated and the workability | operativity of the process of winding a water stop part with a waterproof sheet improves.

  Furthermore, a waterproof sheet is wound around the outer periphery of the water stopping part of the wire harness in a U-shape in advance, and the water stopping part is inserted into the set jig in a state where the water stopping part is received by the waterproof sheet. The sheet can receive the water-stopping agent to prevent the water-stopping agent from dripping, and the water-stopping agent can be permeated into the gap between the electric wire and the waterproof sheet in addition to the gap between the electric wires.

  Furthermore, since the wire group is converged and formed into a circular shape before the water-stopper is infiltrated, the size and shape of the wire group gap do not change before and after the water-stopper penetrates, and the gap is securely stopped. It can be filled with a liquid agent, and the water stop performance can be enhanced. In addition, compared to the case where a waterproofing agent is applied to the aligned wire group, the waterproofing agent can be held between the wire groups, so that dripping is less likely to occur, and a lower viscosity waterproofing agent is used. It is possible to infiltrate the water-stopping agent into small gaps in the electric wire group.

  It is preferable that the tape winding is performed using a transparent tape on both sides of the electric wire group covered with the waterproof sheet so that the appearance of the penetration of the water-stopper into the electric wire group can be achieved. Thereby, it is possible to easily visually check how far the waterstop agent has penetrated.

  The tape winding portion on both sides sandwiching the water stop portion covered with the waterproof sheet, using a water stop agent having at least one of thermosetting, thermoplastic, UV curable, and moisture curable properties A water-stop agent that is drawn outward from the outlet formed in the peripheral wall of the pressurized container and permeates into the wire group by heating, cooling, ultraviolet irradiation or humidification at the position drawn from the outlet. Can be cured at a predetermined position in the axial direction of the wire group.

  In this way, by curing the water-stopping agent from the tape winding part on both sides of the water-stop location, the water-stop agent is prevented from flowing out of the predetermined range outside the water-stop location, Since the penetration force of the water-stopping agent into the electric wire group can be increased, the water-stopping agent can be reliably filled with the entire gap between the electric wires and between the electric wires and the waterproof sheet.

Moreover, this invention provides the wire harness water-stopped by the said line water-stop method.
The water harness that has been water-stopped is inserted into the grommet.
The grommet includes a small-diameter cylindrical portion that allows the water-stopping treatment portion to be inserted in close contact therewith, and a large-diameter cylindrical portion that is continuous with one end of the small-diameter cylindrical portion. A vehicle body locking recess for locking to the periphery of the through-hole provided in is provided.
The waterproof sheet and the grommet wound around the outer peripheral surface of the water stop treatment portion while filling the gap between the wires of the wire harness inserted through the small diameter cylindrical portion of the grommet with a water stop agent to stop the water between the lines. Can be in close contact with the inner peripheral surface.

Furthermore, this invention provides the line water stop apparatus used with the said line water stop method.
The pressure vessel of the line waterproofing device is mounted on a wire harness assembly work table, and a wire harness that is wound on the wire harness assembly work table and taped and covered with the waterproof sheet The water stop portion is inserted into the pressurized container and filled with the water stop agent.

  Thus, since the pressurization container of the line water stop apparatus of this invention is mounted on a wire harness assembly worktable, the line water stop process of the electric wire group of a wire harness can be performed on the assembly line of a wire harness.

  As described above, in the line waterproofing method of the present invention, the water harness is concentrated with a tape except for the water stopping part of the wire harness, and the water stopping part that is not wound with tape is inserted into a U-shaped setting jig. A water-stopping agent is infiltrated into the bundle of electric wires by pressurization. Therefore, it does not require the electric wire group alignment process that was required in the past to apply the water-stopping agent, and it does not require a converging process to round the water-stopped parts that are aligned after filling the water-stopping agent. Workability can be improved.

Moreover, since the electric wire group is taped beforehand, the unevenness | corrugation of an electric wire is lose | eliminated and the workability | operativity of the process of winding a waterproof sheet improves.
Furthermore, a waterproof sheet is wound around the outer periphery of the water stop point of the electric wire group in a U shape, and the water stop point is received by the waterproof sheet and inserted into the set jig. In addition to preventing dripping, the water stop agent can be permeated into the gap between the electric wire and the waterproof sheet in addition to the gap between the electric wires.

The line water stop apparatus used with the line water stop method of the wire harness which concerns on 1st Embodiment of this invention is shown, (A) is a disassembled perspective view, (B) is a BB sectional drawing of (A). is there. It is a perspective view which shows the state which bundled the wire harness circularly and wound the waterproof sheet in U shape. It is a perspective view which shows the state which set the water stop location of the wire harness in the lower case of the pressurized container shown in FIG. It is a perspective view which shows the state which covered the upper case on the lower case of the pressurized container. The state of the water stop part at the time of pressurization is shown, (A) is longitudinal cross-sectional explanatory drawing, (B) is a cross-sectional explanatory drawing. It is explanatory drawing which shows the hardening process of a water stop agent. It is a perspective view which shows the state which coat | covered the water stop location with the waterproof sheet and formed the water stop process part. It is explanatory sectional drawing which shows the state which attached the grommet to the water stop process part of a wire harness, and was penetrated to the through-hole of the vehicle body panel. It is the IX-IX sectional view taken on the line of FIG. It is a figure which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 9 show a first embodiment of the present invention.
As shown in FIG. 8, the wire harness 10 is routed through a through hole 51 provided in a vehicle body panel 50 that partitions an engine room X and a vehicle compartment Y of an automobile. A grommet 40 is attached to the wire harness 10 at a portion through which the through hole 51 is inserted, and a line water stop is applied to the wire harness through which the grommet 40 is inserted.

  The grommet 40 has an annular tube portion 42 which is continuous with one end of a small diameter tube portion 41 through which the wire harness 10 is closely attached and inserted, and is fitted into the through hole 51 of the vehicle body panel 50 on the outer periphery of the expanded diameter tube portion 42. The vehicle body locking recess 43 is provided. The part inserted into the small-diameter cylindrical portion 41 of the wire harness 10 is a water stop point A, and the water stop point A is filled with a water stop agent in the wire group of the wire harness 10 to perform a line water stop process.

  As shown in FIG. 1A and FIG. 4, a line water stopping device 20 having a pressurized container 22 is mounted on a wire harness assembly work table 21, and the line water stop treatment is performed by the wire harness assembly work table 21. Is going on.

  The pressurization container 22 has, for example, a rectangular box shape surrounded by an upper wall 23, a bottom wall 24, left and right side walls 25, and front and rear side walls 26 as shown in FIG. As shown in FIG. 1 (A), the pressurized container 22 is composed of a lower case 22A and an upper case 22B made of symmetrical halves, and includes a cavity 27A of the lower case 22A and a cavity 27B of the upper case 22B. Thus, a compressed air filling cavity 27 is formed.

On both left and right side walls 25A located at both ends of the lower case 22A in the wiring direction, a wire drawing recess 28A is formed from the upper end to hold the wire group 11 converged in a circular shape and to be pulled out to the outside.
The upper case 22B is also provided with a wire drawing recess 28B from the lower end at a position facing the wire drawing recess 28A.
Sealing materials 32A and 32B having flexibility to be in close contact with the outer peripheral surface of the electric wire group 11 are mounted on the inner circumferences of the wire drawing recesses 28A and 28B.
As a result, when the upper case 22B is put on the lower case 22A and the cavity 27 is closed, as shown in FIG. 4, the upper and lower wire lead-out recesses 28A and 28B form a wire outlet 28 made of a round hole. Yes. Further, a compressed air inlet 29 is provided in any case, for example, the upper wall 23 of the upper case 22B.

  A set jig 30 is disposed on the bottom wall 24 in the lower case 22A as shown in FIGS. The setting jig 30 includes a shaft portion 31 erected from the bottom wall 24 and a U-shaped wire receiving portion 34 provided at the upper end of the shaft portion 31. The wire receiving portion 34 is set such that the bottom portion 34a has the same height as the wire drawing recess 28A.

Next, a line water stopping method using the line water stopping device 20 will be described.
First, the wire harness 10 is laid out on the wire harness assembly work table 21, and as shown in FIG. 2, as shown in FIG. 2, an adhesive is placed on both sides of the water stop portion A of the wire group 11 constituting the wire harness 10. The coated transparent tape 13 is wound to converge the electric wire group 11 into a circle.
When the transparent tape 13 is wound, the waterproof sheet 14 is wrapped around the lower half outer periphery of the water stop portion A where the wire group 11 is exposed without winding the transparent tape 13 in a U shape, and the water stop portion is covered. On the upper surface side of A, the electric wire group 11 is exposed without winding and closing the waterproof sheet 14. An adhesive is applied to one end side of the waterproof sheet 14 to form an adhesive portion 14a.

Next, as shown in FIG. 3, the water stop portion in a state where the wire receiving portion 34 of the setting jig 30 disposed in the lower case 22 </ b> A of the pressurized container 22 is covered with a waterproof sheet 14 in a U shape. A is inserted and held together with the waterproof sheet 14. And the winding location of the transparent tape 13 of the both sides of the water stop location A is fitted in the said electric wire extraction recessed part 28A of 22 A of lower cases, and it draws outward.
In this state, the water-stopping agent 15 is applied to the upper surface of the water-stop portion A that is not covered with the waterproof sheet 14.

  The water-stopping agent 15 has a water-stopping agent 15 in the inner direction of the electric wire group and a pressure difference between the pressure of the air around the water-stopping agent 15 and the pressure inside the electric wire group drawn to the outside of the case in the pressurizing step. Those having fluidity that can penetrate in the longitudinal direction are used.

  Moreover, it is preferable that the said water-stopping agent 15 hardens | cures to such an extent that the form of the water-stopping agent 15 is stably maintained at least after the said penetration | infiltration. This curing may be natural curing by moisture, or curing accelerated by irradiation with ultraviolet rays, heating or cooling. However, it is preferable that a certain degree of flexibility is ensured in the water-stopper 15 even after curing. This makes it possible to avoid the occurrence of cracking or breakage of the water-stopping agent 15 due to external force applied during assembly.

  Specifically, as the material of the water stop agent 15, for example, a moisture curable silicone resin and a UV curable or thermosetting silicone resin are suitable. When the silicone resin is used, during the pressurization described later, as shown in FIG. 6, by irradiating with ultraviolet rays or heating the wound portion of the transparent tape 13 at the position pulled out from the wire outlets 28 on both the left and right sides, It can be cured from the water-stopping agent that has reached the range, and can be filled without gaps within a predetermined range.

  Furthermore, if the water stop agent 15 having a thixotropic property is used, when the water stop agent is pressed and penetrated into the electric wire group, the water stop agent is caused by the shearing force generated between the electric wire and the water stop agent. Since it has a low viscosity, it can penetrate into minute gaps. And when it penetrates into the electric wire group and pressurization is finished, the viscosity of the water-stopping agent becomes high and can be stably held in the penetrated gap, thus preventing deterioration of water-stopping performance and dripping. it can.

  Next, as shown in FIG. 4, the upper case 22 </ b> B is placed downward on the upper surface of the lower case 22 </ b> A of the pressurized container 22 to close the cavity 27. As a result, the water stop point A is accommodated in the pressurized container 22, and the wire group 11 is drawn out from the wire outlets 28 on the left and right sides of the pressurized container 22, and the transparent tape 13 of the wire group 11 is The wire outlet port 28 is in close contact with the outer periphery of the wound portion.

Next, as shown in FIGS. 5A and 5B, compressed air is introduced into the cavity 27 from the compressed air introduction port 29 of the pressurized container 22 to pressurize the inside of the pressurized container 22.
In this way, the water-stopping agent 15 is penetrated into the gaps between the electric wires 12 in the electric wire group 11 and the gaps between the electric wire group 11 and the waterproof sheet 14 by pressurization, and outside the electric wire outlet 28. The water-stopping agent 15 that has penetrated to the inside is cured in the transparent tape 13.

  Finally, as shown in FIG. 7, the upper case 22 </ b> B of the pressurized container 22 is removed, and the ends of both ends of the U-shaped waterproof sheet 14 are folded back on the upper surface of the water stop A and wound up. Thereby, the water stop processing part B which coat | covered the whole outer periphery of the water stop location A filled with the water stop agent 15 with the waterproof sheet 14 is formed.

The wire harness 10 in which the water stop processing part by the line water stop method is formed is inserted into the grommet 40. As shown in FIG. 8, the water stop treatment part B of the wire harness 10 is arranged in the small diameter cylindrical part 41 of the grommet 40.
The above-described wire harness 10 is attached to the through hole 51 by fitting the peripheral edge portion of the through hole 51 of the vehicle body panel 50 to the vehicle body engaging recess 43 of the grommet 40 in the assembly line of the automobile.

  According to the above-described line water stopping method of the present invention, the water stopping agent is applied in a state where the water stopping points A of the electric wire group 11 are preliminarily converged into a circular shape, and the water stopping agent 15 is applied to the electric wire group by pressurization. It penetrates inside. Therefore, the electric wire group alignment step and the converging step of winding and rounding the waterproof sheet after applying the water-stopping agent, which are required in Patent Document 1, are unnecessary, and the number of man-hours can be reduced and workability can be improved.

  In addition, the waterproof sheet 14 is arranged in advance on the outer periphery of the water stop spot A before application of the water stop agent 15, and the electric wire group 11 is preliminarily converged in a circular shape. As described above, it is only necessary to overlap and close the tip portions on both sides of the waterproof sheet 14, and there is no need to round off the water-stopped portion with the waterproof sheet 14 as in the prior art. Moreover, since the electric wire group is tape-wrapped in advance, the unevenness of the electric wires is eliminated, and the workability of the process of winding the waterproof sheet is improved.

  Furthermore, since the transparent tape 13 is wound around both sides of the water-stopping portion A, it is possible to easily visually check how far the water-stopping agent 15 has penetrated. Can improve quality stability.

In addition, since the waterproofing agent is applied and pressurized and penetrated in a state where the electric wire group 11 is converged in a circular shape, the size and shape of the gap of the electric wire group do not change before and after the penetration of the waterproofing agent. It can be filled with a water-stop agent to improve water-stop performance. In addition, compared to the case where a waterproofing agent is applied to the aligned wire group, the waterproofing agent can be held between the wire groups, so that dripping is less likely to occur, and a lower viscosity waterproofing agent is used. It is possible to fill the water gap with the minute gaps of the electric wire group.
Furthermore, since the waterproof sheet 14 can be received by the waterproof sheet 14 by winding the waterproof sheet 14 around the electric wire group 11 in a U shape and applying the waterproof agent 15, the low-viscosity waterproof agent 15 is used. However, dripping can be prevented.
Accordingly, the water-stopping agent 15 can be infiltrated into all the gaps including the slight gaps between the electric wires 12 and between the electric wires 12 and the waterproof sheet 14 at the water-stop portion A. Water performance can be increased.

DESCRIPTION OF SYMBOLS 10 Wire harness 11 Electric wire group 13 Transparent tape 14 Waterproof sheet 15 Water stop agent 20 Line water stop device 22 Pressurization container 30 Set jig 40 Grommet 41 Small diameter cylinder part 50 Body panel 51 Through-hole A Water stop part B Water stop process Part

Claims (7)

While winding and concentrating the wire group constituting the wire harness, the water stop point is covered with a waterproof sheet without covering with a waterproof sheet in a U-shape,
Insert and support the water stop point covered with the waterproof sheet in a U-shaped set jig placed in a pressurized container,
Applying a water stop agent to the upper surface of the wire group not covered with the waterproof sheet of the water stop point,
Subsequently, compressed air is introduced into the pressurized container and pressurized, and the water blocking agent is allowed to permeate into the wire group.
Then, the water-stop method for wire harnesses of the wire harness, wherein the ends of both end portions of the U-shaped waterproof sheet are covered with the upper surface of the electric wire group.   The both sides of the electric wire group coat | covered with the said waterproof sheet perform the tape winding using a transparent tape, and use the said water stop agent, The external appearance of the state which this water stop agent osmose | permeates in an electric wire group is enabled. The method for water-stopping a wire harness according to claim 1. As the water-stopping agent, a water-stopping agent having at least one of thermosetting, thermoplastic, UV curable, and moisture curable properties is used,
The tape winding portions on both sides sandwiching the water stop portion covered with the waterproof sheet are drawn outward from the outlet formed in the peripheral wall of the pressurized container, and heated, cooled, or ultraviolet-rayed at the position drawn from the outlet. Irradiation,
The method for water-stopping a wire harness according to claim 1 or 2, wherein a water-stopping agent that penetrates into the wire group is cured at a predetermined position in the axial direction of the wire group.   The line water stopping method for a wire harness according to any one of claims 1 to 3, wherein a water stopping agent having thixotropy is used as the water stopping agent.   The wire harness water-stopped by the line water stop method of any one of Claims 1 thru | or 4.   The wire harness of Claim 5 which has penetrated the said water stop process part in a grommet. A line water stopping device used in the line water stopping method according to any one of claims 1 to 4,
The pressurized container is mounted on a wire harness assembly workbench, tapes a group of wires wired on the wire harness assembly workbench, and the water stop location of the wire harness covered with the waterproof sheet is An inter-wire water-stop device for a wire harness that is inserted into a pressurized container and filled with the water-stop agent.