JP2010226860A - Method for forming inter-line water cutoff portion of wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To unfailingly apply a water stop agent to a bundle of electric wires of a wire harness. <P>SOLUTION: The method for forming an inter-line water cutoff portion by applying a water cutoff agent to a part of a length direction of a bundle of electric wires put together includes the steps of: binding with a tape both ends of a length direction of the bundle of electric wires to be a water cutoff region where an inter-line water cutoff portion is formed, out of the bundle of electric wires routed by being held with a routing tool, on a wire harness assembling platen; covering the bundle of electric wires of the water cutoff region with a waterproof sheet from the lower surface to both side surfaces; dropping a water cutoff agent on the upper surface of the bundle of electric wires on the water cutoff region; inserting the bundle of electric wires in the water cutoff region into a pressurizing container; introducing a compressed air into the pressurizing container to pressurize and apply the water cutoff agent into a space between the bundle of the electric wires; attaching a pressure sensor for sensing the pressure in the pressurizing container; and inspecting a water cutoff accuracy on the basis of a pressure value to be detected with the pressure sensor simultaneously with the pressurizing and applying operation of the water cutoff agent. <P>COPYRIGHT: (C)2011,JPO&INPIT

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, and 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. is 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. 8A and 8B, a 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. As described above, when the pressure is applied from the outside of the sheet, the water-stopping agent can be moved within the region surrounded by the sheet, but whether or not the moved water-stopping agent has surely penetrated into the gap between the electric wires. Cannot be confirmed from the outside of the seat. Further, in order to pressurize the sheet, it is necessary to wind the bag-like sheet for supplying liquid or gas around the sheet as described above. 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-mentioned problem, a method of forming a line water stop part by filling a water stop agent in a part of the length direction of a group of electric wires to be focused,
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 stop region, the wire group in the water stop region is inserted into a pressurized container,
Pressure air is introduced into the pressurized container to pressurize and fill the gap between the wire groups with the water-stopping agent, and a pressure sensor for detecting the pressure in the pressure container is attached to pressurize the water-stopping agent. There is provided a method for forming a line water stop portion of a wire harness, wherein the water stop accuracy is inspected by a pressure value detected by the pressure sensor simultaneously with a filling operation.

  As described above, in the method for forming the line water stop portion of the wire group of the wire harness of the present invention, both ends in the length direction of the water stop region are bound by tape winding while being held by the wiring jig. At the same time, it is covered with a waterproof sheet from the bottom surface to both side surfaces, and a water-stopping agent is applied from the opened top surface and inserted into the pressurized container in this state. Thus, since the prevention sheet has an upper surface opened, pressure air can be directly applied to the water-stopping agent from the opened upper surface, so that the water-stopping agent can be reliably filled into the gaps of the electric wire group. .

In addition, since the pressure in the pressurized container is detected by a sensor, when it is detected that the detected pressure value has reached a substantially constant state after being lowered, It can be determined that the liquid has penetrated without leakage. Thus, in this invention, by inserting in a pressurized container, a water stop performance test | inspection can be performed simultaneously with a water stop process. And since this test | inspection is performed by measuring a pressure with a pressure sensor, it becomes a test | inspection with high precision compared with visual inspection etc.
In the conventional general water-stopping performance inspection, a grommet with a water-stopped interior is attached to the boundary wall between the pressurized container and the container storing water, and the grommet and the wire harness are submerged in the container storing water. The water stop performance is inspected by whether or not bubbles are generated in the container storing the water when pressure is applied from the other side. Therefore, the water stop performance cannot be inspected on a line on the wire harness assembly work table, and must be inspected off-line, resulting in poor workability.
On the other hand, in the present invention, the water stopping performance can be inspected simultaneously with the water stopping treatment on the wire harness assembly work table line, and the workability is good compared with the inspection by submersion performed offline, In addition, no special equipment for inspection is required, and water post-treatment necessary for submersion inspection is also unnecessary.
Moreover, it is not necessary to wind the bag-like sheet | seat which connected the piping for pressure fluid supply like the said patent document 2. FIG.

At the position corresponding to the water stop region on the wire harness assembly work table, first and second wiring jigs provided with U-shaped wire receiving portions on both sides in the length direction are erected, and the Set up a third wiring jig that protrudes from the receiving part that receives the comb-like sectioning rod that divides and inserts the electric wire in the middle part,
After the electric wire group is inserted and held in the first, third, and second wiring jigs, the electric wire group is tape-bound on the outside of the first and second wiring jigs,
Next, after lowering the third wiring jig, after covering the upper surface of the electric wire group with a waterproofing agent in a state where the waterproof sheet is covered from the bottom surface to the both sides of the formation region of the interline waterproofing portion,
On the wire harness assembly work table, the first and second wiring jigs are taken out from the first and second wiring jigs and inserted into the pressure vessel mounted on the side of the first to third wiring jigs. ing.

Insert the wires in series in the adjacent gaps of the plurality of comb-like section rods of the third wiring jig,
A tape made of a transparent tape is wound around and bound to the outside of the first and second wiring jigs on both sides, and the electric wire group is taken out from the first to third wiring jigs. A gap corresponding to the size of the comb-shaped section is formed.

  As described above, when the comb-like third wiring jig is used, the third wiring jig forcibly establishes a column space in which the water-stopping agent easily penetrates into the electric wire group that supplies the water-stopping agent. Can be formed. Thereby, the permeability | transmittance of the water stop agent to the clearance gap between electric wires can be improved.

The wire harness provided with the water stop portion between the lines includes a large-diameter cylindrical portion with a vehicle body locking recess that is locked to a through-hole of the vehicle body panel, and a small-diameter cylindrical portion that is continuous with one end of the large-diameter cylindrical portion. Fit the grommet,
The line water stop portion is inserted in close contact with the small diameter cylindrical portion of the grommet.

  As described above, in the method for forming the line waterproofing part of the wire harness of the present invention, a waterproofing agent is applied from the upper surface opening in a state of surrounding the both sides of the electric wire group in the waterproofing region from the lower surface with a waterproof sheet, Since it inserts in a pressurized container in this state, pressurization is directly applied to a water stop agent, and the gap of an electric wire group is filled, a water stop agent can be made to infiltrate into a crevice certainly. And, since the pressure in the pressurized container is detected by the pressure sensor when the water-stopping agent is filled by the pressurization, when the water-stopping agent is filled without any gaps, the pressure drop in the pressure container stops, Since the detected pressure can be maintained substantially constant, the water stopping performance can be inspected at the same time. Thereby, there exists an advantage that the submersion inspection apparatus performed after attaching a grommet to a line water stop part can be made unnecessary.

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 a side view of a 3rd wiring jig. A pressurized container is shown, (A) is a disassembled perspective view of a container main body and a lid | cover, (B) is sectional drawing of the state which inserted the water stop area | region of the electric wire group into the pressurized container. (A)-(E) are drawings which show the formation process of a line water stop part. It is sectional drawing which shows the pressurization filling state in a pressurized container. It is a graph which shows the relationship between the detection pressure value and time for inspecting water stop performance from the pressure in the pressurized container at the time of water stop processing. It is drawing which shows a modification. It is drawing which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a first embodiment.
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. The through hole H of the vehicle body panel P that partitions (Y) is passed through. 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 stop portion 2 is in close contact with the inner peripheral surface of the small diameter cylindrical portion 3a of the grommet 3. An adhesive tape T is wound around the wire group 6 drawn out from the grommet 3 and the end of the small diameter cylindrical portion 3a of the grommet 3. 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.

In the line waterproofing part 2 of the wire harness 1, the outer periphery of the wire group 6 of the wire harness filled with the water-stopper 5 is covered with a waterproof sheet 9, and the electric wire is connected from both ends in the length direction of the waterproof sheet 9. Transparent adhesive tapes 8A and 8B are wound around the group 6 and bound together.
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 9 is placed on the inner peripheral surface of the small diameter cylindrical portion 3a. Watertight and close contact.

Next, the formation apparatus of the line water stop part 2 of the said wire harness 1 is demonstrated with reference to FIG.2 and FIG.3.
The wiring jigs 11 to 13 are erected on the wire harness assembly work table 10 so as to be able to descend or fall down, and the wire groups 6 constituting the wire harness 1 are sequentially passed through the wiring jigs 11 to 13. It is wired.
In the portion of the water stop region S where the wire harness 1 is provided with the line water stop portion 2, U-shaped wire receiving portions 12 a are provided at both ends in the length direction of the water stop region S at the upper end of the column 12 b. One wiring jig 12A and a second wiring jig 12B are erected. A third wiring jig 13 in which comb-shaped sectioning bars 13a1, 13a2, and 13a3 protrude from a horizontal bar 13c at the upper end of the support column 13b at the center between the first and second wiring jigs 12A and 12B. Is standing.
As shown in FIG. 2 (B), the gap dimension between the comb-shaped sectioning rods 13a1 and 13a2 and 13a2 and 13a3 is set to a dimension that allows one electric wire 6a to be inserted.

  Further, on the wire harness assembly work table 10, a water-stopping agent supply device 14 is installed on the side of the first to third wiring jigs 12 and 13 arranged in the water-stopping region S, A water-stopping agent dropping nozzle 14 a provided rotatably on the supply device 14 can be disposed above the third wiring jig 13.

Moreover, the pressurized container 20 shown to FIG. 3 (A) (B) is mounted in the side of said 1st-3rd wiring jig | tool 12,13. The pressurized container 20 includes a container main body 21 and a lid 22 projecting from a bottom surface with a holding base 23 having a U-shaped cross section, and a wire harness is passed through peripheral walls 21a and 22a with which the container main body 21 and the lid 22 abut. Semi-circular grooves 21b and 22b are provided, and sealing materials 21c and 22c are attached to the inner surfaces thereof so as to penetrate the electric wire groups 6 on both outer sides of the water stop region S in a sealed state.
A compressed air supply pipe 24 is connected to the upper wall 22d of the lid 22, and a pressure sensor 25 is attached to the upper wall 22d to detect the pressure in the pressurized container 20. The detection value of the pressure sensor 25 is displayed on a display 26 attached to the outer surface of the lid 22.

The formation method of the water stop part between lines of the wire harness 1 is demonstrated with reference to FIG.
First, as shown in FIG. 4A, through the wiring jig 11, the first wiring jig 12A, the third wiring jig 13, and the second wiring jig 12B on the wire harness assembly work table 10. Wire group 6 is arranged.
As shown in FIG. 2 (B), the wire group 6 is passed through the outside of the comb-like sectioning rod 13a1, between 13a1 and 13a2, between 13a2 and 13a3, and outside of 13a3 at the center of the water stop region S. These are passed in series in the vertical direction.

  After all the electric wires are routed through the wiring jigs 11 to 13, the first and second wiring jigs 12 </ b> A and 12 </ b> B on both sides of the water stop region S are disposed as shown in FIG. The transparent adhesive tapes 8A and 8B are tightly wound around the outer portion to bind the electric wire group 6.

  Next, as shown in FIG. 4C, the third wiring jig 13 is lowered. In this state, a vertical gap C formed by comb-shaped sectioning rods 13a1 to 13a3 is formed at the center in the length direction of the wire group 6 in the water stop region S.

  Thereafter, as shown in FIG. 4D, the waterproof sheet 9 made of a vinyl chloride sheet or the like coated with an adhesive along the periphery from the lower surface to both side surfaces of the wire group 6 in the water stop region S. Is fixed to the outer peripheral surface of the wire group 6 in a U shape.

  Next, as shown in FIG. 4E, a water-stopping agent 5 made of silicone is dropped from above onto the upper surface of the electric wire group 6 that is not covered with the waterproof sheet 9. The water-stopping agent has a relatively low viscosity and thixotropy, and does not flow out from the portion covered with the waterproof sheet 9.

Thereafter, as shown in FIG. 5, the wire group 6 in the water stop region S is inserted into the container body 21 of the pressurized container 20 disposed on the side of the water stop region S on the wire harness assembly work table 10, A waterproof sheet 9 covering the electric wire group 6 is placed on the holding table 23, and both sides are surrounded by the holding table 23 from the lower surface of the electric wire group 6 covered with the waterproof sheet 9 and held. And the part bound by transparent adhesive tape 8A, 8B of the electric wire group 6 of the both outer sides of the water stop area S is pulled out from the semicircular groove 21b.
Next, the lid 22 is put on the container main body 21, and the wire group 6 is drawn out from between the semicircular groove 22b and the semicircular groove 21b of the lid 22 in a sealed state.

As described above, after the wire group of the water stop region S is accommodated in the pressurized container 20 in a sealed state, compressed air is supplied into the pressurized container 20 from the compressed air supply pipe 24 to pressurize the inside of the pressurized container 20. .
By this pressurization, as shown in FIG. 5, the waterproofing agent 5 supplied to the upper surface of the electric wire group 6 is first formed in the vertical direction in the electric wire group 6 and pushed into the plurality of gaps C, When further pressurized, it is pushed into and penetrates into the gaps between the wires arranged in series in the vertical direction. The penetration state of the water-stopping agent 5 can be seen from the outside by binding the transparent adhesive tapes 8A and 8B drawn from the pressurized container 20.

  The pressure sensor 25 detects the pressure Pt in the pressurized container 20 at the time of the water stop treatment operation in which compressed air is supplied into the pressurized container 20 and the water stopping agent 5 is pushed into the wire group 6. . While the water-stopping agent 5 is filled and infiltrated into the gap of the electric wire group 6 by the compressed air, the pressure in the pressurized container 20 gradually decreases. However, when the gap is completely eliminated by the water-stopping agent 5, The pressure in the pressure vessel 20 can be kept substantially constant. If there is a gap that is not filled with the water-stopping agent 5, the compressed air supplied into the pressurized container 20 leaks to the outside of the pressurized container 20 through the gap between the wires, so the pressure in the pressurized container 20 decreases. Will continue.

  The time change of the pressure value P (t) detected by the pressure sensor 25 becomes the state shown in FIG. 5, and when the pressure value P (t) is higher than the threshold value L after the required time has elapsed with the curve as a threshold value. It can be confirmed that there is no gap in the electric wire group 6 and water stoppage is completely completed. When the pressure value Pt is lower than the threshold value L, it can be seen that there is a gap in the electric wire group, and the water stoppage is not yet complete.

  Since the detection value of the pressure sensor 25 is displayed on the display device 26, it can be confirmed that the water stop is complete, and the line water stop portion 2 can be formed. Take out, cover the upper part of the both sides of the waterproof sheet 9 on the upper surface of the wire group 6, adhere to the wire group 6 with the adhesive of the waterproof sheet 9, and cover the entire circumference of the wire group 6 with the waterproof sheet 9.

  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 waterproofing agent is pressurized and filled into the electric wire group, the waterproofing agent only needs to be dropped on the upper surface of the electric wire group, and does not need to be applied to each electric wire of the electric wire group. Workability is better than

In particular, the pressure in the pressurized container is detected by a pressure sensor during the operation of pressurizing and filling the electric wire group with the water stop agent in the pressurized container. If the pressure in the pressurized container detected by this pressure sensor continues to drop, it can be seen that there is a gap in the wire group, and compressed air in the pressurized container leaks outside through the gap in the wire group. In addition, when the pressure drop is almost eliminated, there is no gap in the electric wire group, and it can be confirmed that the water stop has been completed completely. In this way, the inspection can be performed simultaneously with the work of pressurizing and filling the electric wire group with the water-stopping agent.
Therefore, the submergence inspection etc. which were made by the conventional water stop inspection can be made unnecessary, and the inspection apparatus and the inspection process can be eliminated.

FIG. 7 shows a modification of the wiring jig erected on the wire harness assembly work table.
The wiring jig is provided with a long wire receiving portion 30b having a U-shaped cross section having the length of the water stop region S at the upper end of the support shaft 30a erected from the wire harness assembly work table. A waterproof sheet 9 is attached in advance along the inner surface of the wire receiving portion 30b.
The wire group 6 in the water stop region S is passed through the wire receiving portion 30b of the wiring jig 30 when the wire group is wired.

When the wiring jig 30 is used, it is impossible to forcibly provide a gap between the electric wire groups 6 as compared with the third wiring jig 13 provided with the comb-like section rods of the first embodiment. However, it is possible to save the trouble of attaching the waterproof sheet 9 to the electric wire group after lowering the third wiring jig.
Since other configurations are the same as those of the above-described embodiment, description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Wire harness 2 Line | wire waterproof part 3 Grommet 5 Water stop agent 6 Electric wire group 8A, 8B Transparent adhesive tape 9 Waterproof sheet 10 Wire harness assembly work table 11 Wiring jig 12A 1st wiring jig 12B 2nd wiring Jig 13 Third wiring jig 20 Pressure vessel 24 Compressed air supply pipe 25 Pressure sensor

Claims (4)

A method of forming a line water-stop part by filling a water-stop agent in a part of the length direction of a group of wires to be focused,
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 stop region, the wire group in the water stop region is inserted into a pressurized container,
Pressure air is introduced into the pressurized container to pressurize and fill the gap between the wire groups with the water-stopping agent, and a pressure sensor for detecting the pressure in the pressure container is attached to pressurize the water-stopping agent. A method for forming a line water stop portion of a wire harness, wherein the water stop accuracy is inspected by a pressure value detected by the pressure sensor simultaneously with a filling operation. At the position corresponding to the water stop region on the wire harness assembly work table, first and second wiring jigs provided with U-shaped wire receiving portions on both sides in the length direction are erected, and the Set up a third wiring jig that protrudes from the receiving part that receives the comb-like sectioning rod that divides and inserts the electric wire in the middle part,
After the electric wire group is inserted and held in the first, third, and second wiring jigs, the electric wire group is tape-bound on the outside of the first and second wiring jigs,
Next, after lowering the third wiring jig, after covering the upper surface of the electric wire group with a waterproofing agent in a state where the waterproof sheet is covered from the bottom surface to the both sides of the formation region of the interline waterproofing portion,
On the wire harness assembly work table, the first and second wiring jigs are taken out from the first and second wiring jigs and inserted into the pressure vessel mounted on the side of the first to third wiring jigs. The formation method of the line water stop part of the wire harness of Claim 1 which has. Insert the wires in series in the adjacent gaps of the plurality of comb-like section rods of the third wiring jig,
After wrapping and binding a tape made of transparent tape outside the first and second wiring jigs on both sides, in the state where the electric wire group is taken out from the first to third wiring jigs, The formation method of the line water stop part of the wire harness of Claim 2 which forms the space | gap equivalent to the magnitude | size of a comb-tooth-shaped division part. The wire harness provided with the water stop portion between the lines includes a large-diameter cylindrical portion with a vehicle body locking recess that is locked to a through-hole of the vehicle body panel, and a small-diameter cylindrical portion that is continuous with one end of the large-diameter cylindrical portion. Fit the grommet,
The method for forming an inter-wire water-stop portion of the wire harness according to any one of claims 1 to 3, wherein the inter-wire water-stop portion is inserted in close contact with the small-diameter cylindrical portion of the grommet.

Images