JP5407464B2 - Method of forming a water stop portion between wires of a wire harness - Google Patents

Description

  The present invention relates to a method for forming a line water stop portion of a wire harness routed in a vehicle or the like.

As a wire harness that is routed in an automobile, there is a so-called front harness that is routed from an engine room to a room side through a through hole of a vehicle body panel.
The wire harness is immersed in the gap of the wire group constituting the wire harness in the wiring area on the engine room side of the flooded area, and the water reaches the vehicle interior through the gap of the wire group. There is a risk of entering the connector connecting portion with the wire harness and causing corrosion in the terminals in the connector.
In the wire harness, a grommet is attached to the insertion part to the through hole provided in the vehicle body panel that partitions the engine room and the vehicle compartment to prevent water, dust, noise, etc. from entering the vehicle compartment from the engine room side. Yes. Conventionally, a method of supplying a water-stopping agent into the grommet and water-stopping the gap between the wire groups of the wire harness is generally used.

  However, when supplying a water-stopping agent into the grommet, it is difficult to carry out on the assembly work table of the wire harness, so that there is a problem that the productivity of the wire harness is deteriorated. Therefore, the present applicant provides a line water-stopping method for supplying a water-stopping agent between the wires of the bundled wires on the assembly work table of the wire harness in Japanese Patent Laid-Open No. 2005-51835 (Patent Document 1) and the like. doing.

Further, in the water stop treatment method disclosed in Japanese Patent Application Laid-Open No. 2005-80483 (Patent Document 2), after applying a water stop agent to the surface of the wire group, a sheet is wound around the entire circumference of the wire group, A load is applied to the sheet from the outside of the sheet to pressurize the sheet, and the pressurized portion is sequentially moved to infiltrate the water-stopping agent into the gap between the electric wire groups.
In the first embodiment, it is not specifically described how to apply the pressure applied from the outside. In the second embodiment, as shown in FIGS. 6A and 6B, the bag-like sheet 100 is wound around the outer peripheral surface of the sheet 101, and a pipe 102 for supplying gas or liquid to the bag-like sheet 100 is attached. The sheet 101 is pressurized by expanding 100.

JP 2005-51835 A Japanese Patent Laid-Open No. 2005-80483

  In Patent Document 1, since the electric wires are aligned between the wiring jigs and the water-stopping agent is applied to the outer surface thereof, the water-stopping agent can be reliably applied to the outer peripheral surface of each electric wire, and The water-stopping agent can be infiltrated into the gap between the electric wires. However, when the water-stopping agent has a high viscosity, the water-stopping agent does not easily penetrate into the gap between the wires, and when the viscosity is low, the water-stopping agent tends to sag, and the water-stopping agent is surely applied to the gap between the wires. There is room for improvement.

  In Patent Document 2, a sheet is wound around the entire outer periphery of a group of wires coated with a water stopping agent, and pressure is sequentially applied to the outer periphery of the sheet from one end side to the other end side in the length direction. The water-stopping agent penetrates into the gaps in the electric wire group. Thus, in order to move the water-stopping agent within the region surrounded by the sheet when pressed from the outside of the sheet, it is necessary to wrap a bag-like sheet for supplying liquid or gas around the sheet. Furthermore, it is unclear whether the water stop treatment method of Patent Document 2 can be performed on the wire harness assembly work table.

  The present invention is intended to solve the above-described problems, and can perform water-stop treatment between lines on the wire harness assembly work table, and can reliably infiltrate a water-stop agent into the gaps between the electric wire groups, and can provide reliable water-stop performance. The challenge is to improve the performance.

In order to solve the above problems, the present invention provides:
A wire harness routed from the vehicle's flooded area to the vehicle compartment through the through hole in the vehicle body panel is provided with a line water-stop part at the insertion part of the through hole, and the line water-stop part is closely fitted to the grommet. And inserting the grommet into the through-hole, the wire harness forming method in the wire harness,
On the wire harness assembly workbench, among the wire group held and wired by the wiring jig, both ends in the length direction of the wire group serving as the water stop region forming the inter-line water stop part are tape-bound. And covering the waterproofing area with a waterproof sheet from the lower surface to both sides,
After dripping a water-stopping agent on the upper surface of the wire group in the water-stopping region, only the wire group on the water-receiving region side continuous to the wire group in the water-stopping region is inserted into the vacuum vessel,
A method for forming a line waterstop part of a wire harness, wherein a negative pressure is introduced into the vacuum vessel, and the waterstop agent is sucked and permeated through a gap of an electric wire group to the wetted area side. providing.

In the present invention, as described above, the water-stopping agent dripped onto the electric wire group serving as the water-stopping region is sucked into one side of the electric-wire group on the side where the water-filled region is disposed and penetrates into the gap of the electric wire group. It is characterized by that. In this way, since the water-stopping agent is sucked and penetrated to a necessary place, the amount of water-stopper used can be reduced. And when the water-stopping agent is sucked and permeated using a vacuum vessel, the wire group in the water-stopping region where the water-stopping agent is dropped is arranged outside the vacuum vessel, so during the water-stop treatment The insufficient water-stopping agent can be dropped into the electric wire group.
The dripping water-stopping agent has a relatively low viscosity but has thixotropy to prevent dripping of the water-stopping agent after the water-stopping treatment.

Specifically, on the wire harness assembly work table, a set jig provided with a U-shaped wire receiving portion having a required length is erected at a position corresponding to the water stop region of the line water stop portion, It should be placed in the waterproof sheet along the inner surface of the wire receiving portion of the setting jig, inserting the wire group to form the wire water stopping part in a state of being covered under surface and both side surfaces on the waterproof sheet After that, both ends of the wire group in the length direction are bound in a circle with a transparent adhesive tape winding, and
The vacuum vessel is arranged on the side of the set jig on the wire harness assembly work table, and the line water stop portion is formed on the wire harness assembly work table.

As mentioned above, when the set jig is erected on the wire harness assembly work table and the waterproof sheet is arranged in advance, the lower surface and both side surfaces of the wire group in the water stop region can be easily covered with the waterproof sheet. it can.
In addition, since both ends in the length direction of the wire group in the water stop region are bound in a circular shape with a transparent adhesive tape, when passing through the grommet, it adheres without causing wrinkles in the through hole of the circular grommet having a circular cross section. It is possible to improve the water stop performance of the grommet.
Furthermore, since the transparent adhesive tape is used, it is possible to check the appearance of how far the water-stopping agent has penetrated.

After forming the line water-stopping part by infiltrating the water-stopping agent into the gaps of the wire group, the both ends of the line water-stopping part are heated to cure the water-stopping agent, or irradiated with ultraviolet rays. It is preferable to cure.
Thus, when the water-stopping agent is cured by heating or ultraviolet irradiation at both ends of the water-stopping region, the still water-flowing water-stopping agent sandwiched between the water-stopping agents cured at both ends is outside the water-stopping region. Can be prevented, and the entire amount of the water-stopping agent can be filled in the gaps of the wire groups in the water-stopping region.

The grommet to be attached to the wire harness includes a large-diameter cylindrical portion provided with a vehicle body locking recess that is locked to a through- hole of the vehicle body panel on an outer peripheral surface, and the water-covered region continuously from one end of the large-diameter cylindrical portion. A small-diameter cylindrical portion that protrudes to the side is provided, and the line water-stop portion is tightly fitted through the small-diameter cylindrical portion.

  As described above, in the method for forming the line waterproofing portion of the wire harness according to the present invention, after the waterproofing agent is dropped from the upper surface opening in a state where the electric wire group in the waterproofing region is surrounded by the waterproof sheet from the lower surface to the both side surfaces The electric wire group on one side continuous to the water-stopping region (side wired to the water-receiving region side) is passed through the vacuum vessel, and the water-stopping agent is sucked in with a negative pressure supplied into the vacuum vessel. Since the suction of the water-stopping agent is directed to the area to be wetted, the water-stopping agent dripped onto the wire group does not spread to both sides, and the permeation direction is regulated so that it flows only in the direction where water-stopping is necessary. can do. Therefore, the usage-amount of a water stop agent can be reduced. In addition, there is an advantage that the water-stopping agent that is insufficient due to permeation during the treatment can be dripped and supplemented to the wire group in the water-stop region located outside the vacuum vessel.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiment of this invention is shown, (A) is a front view which shows the state which has wired the wire harness which attached the grommet to the line water stop part to the motor vehicle, (B) is sectional drawing. (A) is a schematic perspective view which shows the formation apparatus of a line water stop part, (B) is an expansion perspective view of a set jig. It is a disassembled perspective view of a vacuum vessel. (A)-(C) are drawings which show the formation process of a line water stop part. It is sectional drawing which shows the suction process of the water stop agent in a vacuum vessel. (A) (B) is drawing which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The embodiment is shown in FIGS.
The wire harness 1 provided with the line water stop part of the embodiment is routed from the engine room of the automobile to the vehicle compartment side, and as shown in FIG. 1 (A), the engine room (X) and the vehicle compartment. It penetrates the through hole H of the vehicle body panel P that partitions (Y). As shown in FIG. 1 (B), the wire harness 1 in the portion that penetrates the through hole H is provided with a line water-stop part 2, and the line water-stop part 2 passes through a grommet 3 made of rubber or the like. The outer peripheral surface of the line water blocking portion 2 is in close contact with the inner peripheral surface of the small diameter cylindrical portion 3a of the grommet 3 in a watertight state. An adhesive tape T is wound between the electric wire group drawn out from the grommet 3 and the tip of the small diameter cylindrical portion 3a to fix the electric wire group and the grommet 3 together.
The grommet 3 has a shape including a large-diameter cylindrical portion 3c provided on the outer peripheral surface with a vehicle body engaging concave portion 3b that is continuous with the small-diameter cylindrical portion 3a and is in close contact with the inner peripheral surface of the through hole H.
The small-diameter cylindrical portion 3a of the grommet 3 in which the interline water-stopping portion 2 is closely fitted is disposed on the engine room (X) side of the wet region.

In the inter-wire waterproofing part 2 of the wire harness 1, the outer periphery of the wire group 6 filled with the water-stopper 5 is covered with a waterproof sheet 7, and the waterproof sheet 7 extends from both ends in the length direction to the wire group 6. Transparent adhesive tapes 8A and 8B are wound and bound respectively.
The line water stop portion 2 having the above-described configuration is inserted by expanding the small diameter cylindrical portion 3a of the grommet 3 with an expansion jig (not shown), and the outer peripheral surface of the waterproof sheet 7 on the inner peripheral surface of the small diameter cylindrical portion 3a. Watertight and close contact.

Next, an apparatus for forming the line water stop portion 2 of the wire harness 1 will be described with reference to FIGS. 2 and 3.
A wiring jig 11 is erected on the wire harness assembling work table 10 such that the wiring jig 11 can be lowered or overturned, and the wire group 6 constituting the wire harness 1 is sequentially passed through the wiring jig 11 to perform wiring. Yes.
The set jig 12 is erected from the wire harness assembly work table 10 in the portion of the water stop region S where the wire harness 1 is provided with the line water stop portion 2. The setting jig 12 has a shape in which a wire receiving portion 12a having a U-shaped cross section is provided at the upper end of the support shaft 12b with a dimension obtained by subtracting the winding length of the transparent adhesive tapes 8A and 8B from the length of the water stop region S. The support shaft 12b is erected on the wire harness assembly work table 10 so as to be lowered.
In the set jig 12, the waterproof sheet 7 is set on the inner surface of the wire receiving portion 12a before wiring the wire group. The waterproof sheet 7 is previously coated with an adhesive along the entire inner surface or along the periphery of the inner surface.

  Further, on the wire harness assembly work table 10, a water-stopping agent supply device 14 is installed on the side of the setting jig 12 arranged in the water-stopping region S, and the attached water-stopping agent dropping nozzle 14 a is installed on the setting jig. 12 can be rotated upward.

Further, on the wire harness assembly work table 10, a vacuum container 20 is mounted on the side of the set jig 12 arranged in the water stop region S. As shown in FIG. 3, the vacuum container 20 includes a container main body 21 and a lid 22, and the peripheral walls 21a and 22a with which the container main body 21 and the lid 22 come into contact are provided with semicircular grooves 21b and 22b for penetrating the wire harness. The sealing members 21c and 22c are attached to the inner surface of the inner surface, and the electric wire groups 6 on both outer sides of the water stop region S are penetrated in a sealed state.
An air suction pipe 24 is connected to the upper wall of the lid 22 so that the air in the vacuum container 20 can be sucked to make the inside of the vacuum container 20 have a negative pressure.

  Further, a heater 25 provided with a through hole 25a of a size capable of loosely inserting the wire group 6 around the semicircular groove 21b is installed in the container main body 21 of the vacuum container 20.

The formation method of the line water stop part of the wire harness 1 is demonstrated.
First, as shown in FIGS. 2 (A) and 2 (B), the wire group 6 is wired through the wiring jig 11 and the setting jig 12 on the wire harness assembly work table 10.
At the time of wiring, the lower surface and both side surfaces are surrounded by the waterproof sheet 7 of the wire receiving portion 12a of the set jig 12 around the outer periphery of the wire group 6 in the water stop region S.

  After all the electric wires are routed through the wiring jig 11, the transparent adhesive tapes 8A and 8B are wound around the electric wire group 6 at both outer positions of the setting jig 12, as shown in FIG. Band together.

  Next, as shown in FIGS. 4B and 4C, the water-stopping agent dropping nozzle 14a of the water-stopping agent supply device 14 is rotated so as to be positioned above the electric wire group 6 in the water-stopping region S so as to have a relatively low viscosity. Then, a water-stopping agent 5 made of silicone having thixotropy is dropped. Since the water stop agent 5 has thixotropy, it does not flow out of the water stop region surrounded by the waterproof sheet 7.

Thereafter, as shown in FIG. 5, the wire group 6 in the water stop region S is removed from the setting jig 12, and the one wire group 6 sandwiching the water stop region S is replaced with a semicircular groove in the container body 21 of the vacuum vessel 20. The wire group 6 is passed through the container main body 21 through the through hole of the heater 25 while passing through 21b. The portion through which the semicircular groove 21b passes is an intermediate position of the winding position of the transparent adhesive tape 8A, and a part of the portion bound by the transparent adhesive tape 8A is positioned outside the container body 21. Thus, the wire group 6 in the water stop region S is not inserted into the vacuum vessel 20, and only one wire group sandwiching the water stop region is passed through the vacuum vessel 20.
Thereafter, the lid 22 is put on the container main body 21, and the wire group 6 is drawn out in a sealed state. The electric wire group 6 passing through the vacuum vessel 20 is a portion disposed on the engine room (X) side which becomes a wet area when being routed to an automobile.

As described above, after the electric wire group 6 is housed in the vacuum container 20 in a sealed state, the air in the vacuum container 20 is sucked from the air suction pipe 24 to obtain a negative pressure. Due to this negative pressure, the water-stopping agent 5 supplied to the upper surface of the wire group 6 in the water-stopping region S located outside the vacuum vessel 20 by the differential pressure between the pressure P1 inside the vacuum vessel 20 and the pressure P2 outside the vessel. Is sucked through the gap of the wire group 6 toward the vacuum container 20 and penetrates into the gap.
The penetration state of the water blocking agent 5 can be seen from the outside through the transparent adhesive tape 8A.

  In that case, when it is seen that the water-stopping agent 5 dripped previously is insufficient, the water-stopping agent 5 is dripped again into the electric wire group 6 from the water-stopping agent dropping nozzle 14a. Fill all gaps with the water-stopper 5.

Air suction from the vacuum vessel 20 is stopped after it is confirmed that the gap 5 is filled with the water-stopping agent 5 in the portion of the wire group 6 bound by the transparent adhesive tape 8A drawn out from the vacuum vessel 20. To do.
Next, the heater 25 in the vacuum vessel 20 is turned on and heated to heat and cure the water-stopping agent 5 penetrating into the wire group 6.

  Thereafter, the electric wire group 6 is taken out from the vacuum container 20, the upper portions of both sides of the waterproof sheet 7 are covered on the upper surface of the electric wire group 6, and the adhesive of the waterproof sheet 7 is adhered to the electric wire group 6. The periphery is covered with a waterproof sheet 7.

  Thereafter, as shown in FIG. 1, the small diameter cylindrical portion 3 a of the grommet 3 is expanded and pushed open with a jig, the interline water-stopping portion 2 of the wire harness 1 is inserted, and the inner peripheral surface of the small diameter cylindrical portion 3 a of the grommet 3 The line water stop part 2 is adhered to and penetrates.

As described above, in the method for forming the line waterstop portion of the wire harness of the present invention, the waterstop treatment is performed on the wire harness assembly work table on the line where the wire group is wired to the wiring jig. Can do. Further, since the water-stopping agent is sucked and penetrated into the gaps between the wire groups, the water-stopping agent only needs to be dropped on the upper surface of the wire group, and does not need to be applied to each wire of the wire group. Workability is better than 1.
And since the water-stopping agent 5 is made to osmose | permeate only to the one side of the electric wire group 6 from the dripped position, the usage-amount can be reduced. Further, when the dropped water-stopping agent 5 is insufficient, the water-stopping agent 5 can be dropped again on the upper surface of the wire group 6 during penetration by suction, and the water-stopping agent 5 is inserted into the gap between the wire groups 6. Can be completely filled, and the water stop performance can be improved.

The present invention is not limited to the above-described embodiment, and the heater for curing the water-stopping agent may be arranged separately without being installed in the vacuum container 20 and heated after taking out the electric wire group from the vacuum container 20.
Furthermore, UV curable silicone that cures the water-stopping agent 5 by ultraviolet irradiation may be used, and an ultraviolet irradiator may be disposed in place of the heater.

DESCRIPTION OF SYMBOLS 1 Wire harness 2 Line | wire waterproof part 3 Grommet 5 Water stop agent 6 Electric wire group 7 Waterproof sheet 8A, 8B Transparent adhesive tape 10 Wire harness assembly work table 12 Set jig 14 Water stop agent supply apparatus 20 Vacuum container 24 Air suction pipe 25 Heater S Water stop area

Claims (4)

A wire harness routed from the vehicle's flooded area to the vehicle compartment through the through hole in the vehicle body panel is provided with a line water-stop part at the insertion part of the through hole, and the line water-stop part is closely fitted to the grommet. And inserting the grommet into the through-hole, the wire harness forming method in the wire harness,
On the wire harness assembly workbench, among the wire group held and wired by the wiring jig, both ends in the length direction of the wire group serving as the water stop region forming the inter-line water stop part are tape-bound. And covering the waterproofing area with a waterproof sheet from the lower surface to both sides,
After dripping a water-stopping agent on the upper surface of the wire group in the water-stopping region, only the wire group on the water-receiving region side continuous to the wire group in the water-stopping region is inserted into the vacuum vessel,
A method for forming a line waterproofing part of a wire harness, wherein a negative pressure is introduced into the vacuum vessel, and the waterproofing agent is sucked and permeated through a gap between electric wire groups to the wetted region side. On the wire harness assembly work table, a set jig provided with a U-shaped wire receiving portion having a required length is erected at a position corresponding to the water stop region of the line water stop portion. should be placed in the waterproof sheet along the inner surface of the wire receiving portion, the electric wire a wire group to form the wire water stopping part after insertion in the state of being covered under surface and both side surfaces on the waterproof sheet Both ends of the group in the length direction are bound in a circle with a transparent adhesive tape, and
2. The wire harness according to claim 1, wherein the vacuum vessel is disposed on a side of the set jig on the wire harness assembly work table, and the line water stop portion is formed on the wire harness assembly work table. Method of forming a line water-stop part.   After forming the line waterproof part by infiltrating and filling the gap between the electric wire groups, the both ends of the line waterproof part are heated to cure the waterproof agent, or UV The method for forming an interline water-stop portion of the wire harness according to claim 1, wherein the wire harness is cured by irradiation. The grommet to be attached to the wire harness includes a large-diameter cylindrical portion provided with a vehicle body locking recess that is locked to a through- hole of the vehicle body panel on an outer peripheral surface, and the water-covered region continuously from one end of the large-diameter cylindrical portion. A wire harness line stop according to any one of claims 1 to 3, further comprising a small-diameter cylindrical portion that protrudes toward the side, wherein the line-water-stop portion is closely fitted through the small-diameter cylindrical portion. Formation method of water part.

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