JP5897972B2 - Method for forming water-stop part of wire harness and water-stop material - Google Patents

Description

  The present invention relates to, for example, a method for forming a water-stop portion of a wire harness routed between electronic and electrical devices mounted on an automobile, a water-stop material, and a wire harness.

  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 the engine room and the vehicle interior, and the wire harness penetration part of this grommet is usually subjected to a water stop treatment.

As this type of water stop processing method, for example, there is a method for forming a water stop portion of a wire harness disclosed in Patent Document 1.
As shown in FIG. 13, first, the U-shaped portion of the water stop forming jig 505 is arranged on both sides of a predetermined position of the wire bundle 503 in which a plurality of electric wires 501 are bundled. It is supported by a pair of large support tools 507, and the inner wire bundle 503 is held by a pair of small support tools 509 having a smaller U-shaped portion, thereby loosening and expanding in the vertical direction.

  Next, after applying the liquid silicon 511 as a water stop material between the loosened and spread electric wires 501, as shown in FIG. 14A, the electric wires 501 are converged, After the part to which the silicon 511 is applied is dried, a water-stop sheet 513 is wound around the part to cover the part. Next, as shown in FIG. 14B, the water stop portion 519 shown in FIG. 14C is formed at a predetermined position of the wire harness 517 by winding the tape 515 around both ends of the water stop sheet 513. . By fitting the water stop portion 519 into the wire harness penetration portion of the grommet, the wire harness penetration portion is subjected to water stop treatment.

JP 2005-71790 A

However, in the above-described conventional method for forming the water stop portion of the wire harness 517, since the silicon 511 applied between the spread electric wires 501 is liquid, expensive application equipment is required to apply the silicon 511 evenly. . In addition, the liquid silicon 511 has a problem that the applied state changes due to a change in viscosity (temperature, deterioration), does not adhere evenly, and the water stop performance is not stable.
Conventionally used liquid water-stopping materials are often solidified by humidity and temperature in the atmosphere, and are discarded when the expiration date comes after opening the sealed container. Moreover, since it is a liquid, it may drip at the time of processing and adhere to other parts, causing problems such as poor conduction, and handling of the water-stopping material is difficult.

  The present invention has been made in view of the above situation, and the object of the invention is to improve the handleability of the water stop material and to provide a wire harness capable of reliably and efficiently filling the water stop material between the electric wires. It is providing the water stop part formation method, a water stop material, and a wire harness.

The above object of the present invention is achieved by the following configuration.
(1) A step of routing the wires in a predetermined position of the wire bundle in which a plurality of wires are bundled in a vertical direction, and a solid having flexibility in which the wires separated in the vertical direction are formed in a tape shape A step of coating with a water-stopping material, and a step of impregnating between the electric wires the water-stopping material in which the water-stopping material is pressurized and heated while being heated from outside with a heating and pressurizing means and does not drip. A method of forming a water stop portion of the wire harness, comprising: converging the plurality of electric wires impregnated with the water stop material and winding a water stop sheet to form a water stop portion.

  According to the method for forming the water stop portion of the wire harness having the configuration (1), since the water stop material is a solid solid having a tape shape, a uniform amount can be attached to the electric wire per unit area. . The solid water-stopping material does not react due to atmospheric humidity or room temperature, and does not occur due to expiration of use. Moreover, since a solid water-stopping material does not drip even if fluidity occurs during heating, it does not easily adhere to other parts. Further, since the solid water-stopping material has flexibility even after cooling, it is possible to maintain a watertight structure in which no gap is generated between the members by deforming following the deformation of a rubber grommet or the like. Since the solid water-stopping material formed into a tape shape can be cut and easily formed into a desired material length or material width and the amount of adhesion can be adjusted, there is no need for expensive application equipment.

(2) A step of distributing a predetermined position of an electric wire bundle in which a plurality of electric wires are bundled into a plurality of electric wire rows, distributing each electric wire in each electric wire row in the vertical direction, and the assigned electric wire rows A step of coating each electric wire with a solid water-stopping material having flexibility formed in a tape shape, and fluidity that does not drip by heating the water-stopping material while heating from the outside with a heating and pressurizing means. A step of impregnating the water stop material between the electric wires in each of the electric wire rows, and converging a plurality of the electric wires in each of the electric wire rows impregnated with the water stop material and winding a water stop sheet. A step of forming a water stop portion, and a method of forming a water stop portion of a wire harness.

  According to the method for forming the water stop portion of the wire harness having the configuration (2), since the water stop material is a solid solid having a tape shape, a uniform amount per unit area can be attached to the electric wire. . The solid water-stopping material does not react due to atmospheric humidity or room temperature, and does not occur due to expiration of use. Moreover, since a solid water-stopping material does not drip even if fluidity occurs during heating, it does not easily adhere to other parts. Further, since the solid water-stopping material has flexibility even after cooling, it is possible to maintain a watertight structure in which no gap is generated between the members by deforming following the deformation of a rubber grommet or the like. Since the solid water-stopping material formed into a tape shape can be cut and easily formed into a desired material length or material width and the amount of adhesion can be adjusted, there is no need for expensive application equipment. Furthermore, a water stop part can be formed easily and reliably even in a large-diameter wire bundle having a large number of wires by distributing a plurality of electric wires into a plurality of rows and performing a water stop treatment.

(3) A method for forming a water-stop part of a wire harness having the above-described configuration (1) or (2), wherein one surface of the water-stop material having adhesiveness is covered with release paper, and the vertical direction After bonding each separated electric wire on the other surface of the water-stopping material, pressurizing while heating from the outside with the heating and pressurizing means while the release paper is stuck, between the electric wires A method for forming a water stop portion of a wire harness, wherein the water stop material is melted and impregnated.

  According to the method for forming the water stop portion of the wire harness having the configuration (3) above, a solid stop is formed between the electric wires by applying pressure while heating from the outside by the heating and pressurizing means with the release paper attached. By melting and impregnating the water material, the melted water stop material does not adhere to the heating and pressurizing means, and the workability is improved. In addition, when converging a plurality of electric wires impregnated with an adhesive water-stopping material, the electric wire, the water-stopping material, and the water-stopping material are in contact with each other so as to be in close contact with each other. The gaps between the materials can be filled reliably.

(4) A method for forming a water-stop portion of a wire harness having the above-described configuration (1) or (2), wherein the water-pressing material is wound around each electric wire separated in the vertical direction, and then the heating and pressurization is performed. A method for forming a water stop portion of a wire harness, wherein the water stop material is melted and impregnated between the electric wires by applying pressure while heating from the outside by means.

  According to the method for forming the water stop portion of the wire harness having the configuration of (4), each wire is pressed while being heated from the outside by the heating and pressurizing means in a state where a tape-like water stop material is wound around each wire. By melting and impregnating a solid water stop material between the electric wires, the gaps between the electric wires can be reliably filled.

(5) Each electric wire in a predetermined position of the electric wire bundle in which a plurality of electric wires are bundled is spread up and down and impregnated with a water stop material between the separated electric wires, and then the plural electric wires are converged. A water-stop material used in a method for forming a water-stop portion of a wire harness that winds a water-stop sheet and forms a water-stop portion, and is formed into a tape-like solid having flexibility and self-bonding at room temperature The water stop is characterized in that after being bonded to each of the separated electric wires, it is impregnated between the electric wires by generating fluidity that does not drip by being pressurized while being heated by a heating and pressurizing means. Wood.

According to the water-stopping material having the structure of (5) above, the water-stopping material is made into a solid (gel) having flexibility and self-bonding property formed in a tape shape at the time of sticking operation at room temperature. Therefore, a water stop material can be easily affixed on an electric wire, without sticking to electric wires, fingers, etc. other than water stop materials. When the water stop material is impregnated between the electric wires by heating, fluidity that does not drop is generated, so that good impregnation is possible without adhering to other parts.
Moreover, even if the waterstop material becomes solid again after heating, it has flexibility and self-bonding property. Therefore, deformation following an elastic water-stopping member such as a grommet is possible, and a gap that reduces the water-stopping performance is hardly generated between the elastic water-stopping member and the elastic water-stopping member. In addition, when converging a plurality of electric wires impregnated with a self-adhesive water-stopping material, the water-stopping materials come into contact with each other so that the gap between the electric wire and the water-stopping material or between the water-stopping materials Can also be filled reliably.

(6) A waterstop material having the configuration of (5) above,
After one surface is coated with release paper and the other surface is bonded to each separated electric wire, the fluidity that does not drip by being pressurized with heating and pressurizing means through the release paper is provided. A water stop material produced and impregnated between the electric wires.

  According to the water-stopping material having the configuration of (6) above, one surface of the water-stopping material having self-bonding property is covered with release paper at the time of sticking operation at room temperature, so The other surface can be easily bonded to the electric wire without being attached. In addition, when heating to impregnate the water-stopping material between the wires, pressurizing while heating through the release paper causes the water-stopping material to flow without sticking to the heating and pressurizing means. be able to.

(7) A wire harness comprising a water stop part formed by the water stop part forming method of any one of the above (1) to (4).

  According to the wire harness having the configuration of (7) above, since the water-stopping material is stably impregnated between the electric wires serving as the water-stopping portions, from the through hole of the panel on which the elastic water-stopping member such as a grommet is mounted. It is possible to obtain a highly reliable wire harness that can reliably prevent water from entering the passenger compartment.

(8) The wire harness according to (7) above,
A grommet having a penetrating portion in which the wire bundle is inserted and the water stop portion is disposed;
With
The wire harness water stop treatment structure, wherein a storage portion formed in a large diameter is provided in the penetrating portion, and the water stop portion of the wire bundle is stored in the storage portion.

  According to the water-stopping treatment structure of the wire harness having the configuration of (8) above, water is stopped with a high water-stopping effect between the electric wires and between the electric wire and the through-hole portion, and a pressure that is not normal is applied to the water-stopping portion. Therefore, an appropriate pressure can be applied to the water stop portion.

  According to the method for forming a waterstop portion of a wire harness, the waterstop material, and the wire harness according to the present invention, the handleability of the waterstop material can be improved, and the waterstop material is reliably and efficiently filled between a plurality of electric wires. Can be made.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

When forming the water stop part of the wire harness which concerns on 1st Embodiment of this invention, it is a perspective view which shows the state which distribute | divided the some electric wire which comprises an electric wire bundle into two right and left rows, and was distributed up and down. It is a perspective view which shows the state which bonded the water stop material with release paper to the electric wire distributed to two right and left rows of FIG. It is a cross-sectional view which shows the state which bonded together the water stop material with release paper to the electric wire separated up and down of FIG. It is a perspective view which shows the state which heats and pressurizes the water-stopping material stuck to the electric wire divided and divided into two right and left lines of FIG. 2 through the release paper. It is a top view which shows the state which converged the electric wire in each electric wire row | line after impregnating a water stop material between each electric wire divided and distributed up and down in two right and left rows of FIG. It is a top view which shows the part which converged the electric wire of 2 left and right rows of FIG. 5 further to one, and was impregnated with the water stop material. It is a top view which shows the state which wound the water stop sheet | seat around the part impregnated with the water stop material of FIG. It is a top view which shows the state which wound the tape around the both ends of the water stop sheet | seat of FIG. 7, and formed the water stop part. It is a front view of the heating-pressing means used when heating and pressurizing a water stop material. It is a longitudinal cross-sectional view which shows the state which fitted the water stop part of the wire harness to the wire harness penetration part of the grommet. (A) is a principal part perspective view which shows the state which wound the water stop material around each of the electric wire separated up and down, when forming the water stop part of the wire harness which concerns on 2nd Embodiment of this invention. (B) is a cross-sectional view which shows the state which heats and pressurizes the water stop material wound around the electric wire of (a) with a heating pressurization means. (A) is a cross-sectional view showing a state in which the electric wires are converged after impregnating a water-stopping material between the electric wires separated vertically in FIG. 11 (b), and (b) is a cross-sectional view of (a). It is a cross-sectional view which shows the state which wound the water stop sheet | seat around the part impregnated with the water material. When forming the water stop part of the conventional wire harness, it is a perspective view which shows the state which spread | deployed the several electric wire which comprises an electric wire bundle up and down. (A) is a perspective view which shows the state which winds a water stop sheet around the part which impregnated the water stop material to each electric wire of the wire bundle of FIG. 13, (b) winds a tape around the both ends of the water stop sheet of (a) The perspective view which shows a state, (c) is a perspective view which shows the water stop part of the conventional wire harness. In the wire harness which concerns on 3rd Embodiment of this invention, it is a top view which shows the part which converged the electric wire of 2 right and left rows further converged into one, and was impregnated with the water stop material. It is a top view which shows the state which wound the water stop sheet | seat around the part impregnated with the water stop material of FIG. It is a longitudinal cross-sectional view which shows the state which penetrated the water stop part of the wire harness explaining 3rd Embodiment of this invention to the wire harness penetration part of a grommet. It is sectional drawing of an electric wire in the state without a water stop material in the clearance gap between electric wires.

(First embodiment)
Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 10, the wire harness penetration part 15 of the grommet 13 that penetrates the wire harness 11 through a panel (both not shown) that partitions the engine room from the vehicle interior is formed at a predetermined position of the wire harness 11. The water stop portion 17 is fitted and water stop processing is performed.
As shown in FIGS. 1-4, when forming the water stop part 17 in the wire harness 11 which concerns on this embodiment, the water stop part formation jig | tool 21, the water stop material 19, and the heating-pressing means 23 And respectively.

  As shown in FIGS. 1, 2, and 4, the water stop forming jig 21 according to the present embodiment has a U-shaped holding with a large interval for holding both sides of the wire bundle 33 constituting the wire harness 11. A pair of large holding tools 35 having a portion are provided. Moreover, the water stop part forming jig 21 distributes the plurality of electric wires 31 of the electric wire bundle 33 between the pair of large holders 35 into two left and right rows and spreads them in the vertical (vertical) direction and has a narrow and narrow interval. A total of four U-shaped small holders 37 are provided on each of the left and right sides. These large holders 35 and small holders 37 can be adjusted in position in the height direction.

  The water stop material 19 of this embodiment has heat meltability. In this specification, heat meltability means that fluidity that does not drip is generated by heating to a predetermined temperature. As shown in FIG.2 and FIG.3, the water stop material 19 is made into the solid (gel) provided with the softness | flexibility and the self-fusing property at the normal temperature shape | molded in the tape shape. The water-stop material 19 having self-bonding property can be bonded only by combining its own adhesive surfaces (interfaces). The water blocking material 19 is applied while being heated by the heating and pressurizing means 23 through the release paper 27 after being bonded to each electric wire 31 having one surface 25 covered with the release paper 27 and the other surface 29 separated. By being pressed, a fluidity that does not drop is generated and impregnated between the electric wires 31. In addition, as a water stop material which concerns on this invention, not only the water stop material 19 provided with the self-fusing property but a water stop material provided with normal adhesiveness can also be used.

  As shown in FIGS. 4 and 9, the heating and pressing means 23 includes a pair of holders 39 and a heating and pressing plate 41 attached to the opposing surfaces of the holders 39. The heat and pressure plate 41 can melt the water stop material 19 in a state where, for example, the fluidity that is heated to 90 ° C. and does not drop is generated.

Next, the process of forming the water stop part 17 in the predetermined position of the wire harness 11 is demonstrated in order along FIGS.
First, as shown in FIG. 1, both sides of the wire bundle 33 located in the vicinity of the position of the water stop portion 17 to be formed (predetermined position of the wire bundle 33) are held by a pair of large holders 35. At the same time, the plurality of electric wires 31 of the electric wire bundle 33 are equally distributed to the two right and left electric wire rows 43, and the plural electric wires 31 in the two left and right electric wire rows 43 are vertically aligned by a pair of front and rear small holders 37 ( Arrange one line at a time in the vertical direction.

  Next, as shown in FIG. 2 and FIG. 3, the electric wires 31 that are equally distributed to the two right and left electric wire rows 43 and arranged so as to be arranged one by one vertically have the flexibility of being formed into a tape shape. Cover with a solid water blocking material 19. That is, the other surfaces 29 of the pair of water blocking materials 19 are bonded to the left and right sides of the plurality of wires 31 in each wire row 43 so as to be sandwiched from the left and right with respect to the wires 31 by their self-bonding properties. . At this time, the release paper 27 is not peeled off on the one surface 25 of the water-stopping material 19 but remains attached. Therefore, during the sticking operation, the pair of water sealing materials 19 having self-bonding properties can be easily bonded with the other surfaces 29 sandwiching the electric wires 31 without sticking to fingers or the like.

  Next, as shown in FIG. 4, a pair of water-stopping members 19 attached to both surfaces of the plurality of electric wires 31 arranged vertically one by one in the right electric wire row 43 are heated and pressurized. The heating and pressurizing plate 41 of the pair of holders 39 is pressed while being heated from above the release paper 27 attached to one surface 25 of the water blocking material 19. Thereby, the water stop material 19 melt | dissolved in the state which the fluidity | liquidity which does not drip has arisen between each electric wire 31 separated so that it may line up one by one in the electric wire row | line | column 43 of the right row is impregnated. After impregnating the melted water-stopping material 19 in the right row of electric wires 43, the left row of electric wires 43 is similarly melted in a state where fluidity that does not drip by the heating and pressurizing means 23 is generated. A water material 19 is impregnated between the electric wires 31. Thereby, the water stop material 19 can be impregnated between each electric wire 31 reliably and efficiently. At this time, by applying pressure while heating through the release paper 27, the water stopping material 19 can be made fluid without sticking to the heating and pressing plate 41.

Next, as shown in FIG. 5, the release paper 27 is peeled off from the water stop material 19, and then the left and right two rows of electric wires 31 impregnated with the water stop material 19 are folded and stacked to converge to the left and right electric wire bundles 45. Let
Next, as shown in FIG. 6, the left and right electric wire bundles 45 are further converged to form one electric wire bundle 33. Since the water-stopping material 19 has a self-bonding property even at room temperature, when the left and right electric wire bundles 45 are converged into one after cooling, the water-stopping material 19 touches and comes into close contact with the electric wires 31. The gap between the water stop material 19 and the water stop material 19 can also be reliably filled.

From this state, as shown in FIG. 7, a water-stop sheet 49 made of ethylene / propylene rubber is wound around the portion of the wire bundle 33 impregnated with the water-stop material 19.
Thereafter, as shown in FIG. 8, the water stop portions 17 are formed at predetermined positions of the wire harness 11 by winding the tapes 51 around both ends of the water stop sheet 49. As shown in FIG. 10, the water harness penetrating portion 15 of the wire harness 11 is water tightly fitted by fitting it closely to the wire harness penetrating portion 15 of the rubber grommet 13. .

  According to the wire harness 11 having the water stop portion 17 at a predetermined position of the wire bundle 33, the water stop material 19 is stably impregnated between the electric wires 31 of the wire bundle 33. It is possible to reliably prevent water from entering through the through hole of the mounted panel and to improve the reliability of the water stop performance.

  As described above, according to the water stopping part forming method of the wire harness 11 of the present embodiment, since the water stopping material 19 is a solid having flexibility and self-bonding property formed in a tape shape, it is uniform per unit area. A sufficient amount can be attached to the electric wire 31. The solid water-stopping material 19 does not react due to atmospheric humidity or room temperature, and is not discarded due to expiration of use.

  Since the solid water blocking material 19 according to the present embodiment does not drop even if fluidity occurs during heating, adhesion to other parts hardly occurs. Furthermore, since a tape-shaped solid water-stopping material 19 having a release paper 27 attached to one surface 25 is used, an operator during the operation is compared with a conventional liquid water-stopping material. It is difficult for the water-stopping material 19 melted in the hand to adhere and the handleability of the water-stopping material 19 can be improved.

  In addition, since the solid water blocking material 19 has flexibility even after cooling, it can follow the deformation of the grommet 13 and maintain a watertight structure in which no gap is generated between the members. Furthermore, since the solid water blocking material 19 formed into a tape shape can be cut and easily formed into a desired material length or material width and the amount of adhesion can be adjusted, there is no need for expensive coating equipment.

Furthermore, according to the water stopping part forming method of the wire harness 11 of the present embodiment, the number of the electric wires 31 is larger than the conventional one by distributing the plurality of electric wires 31 to the left and right two rows and performing the water stopping treatment. The water stop portion 17 can be easily and reliably formed even with the wire bundle 33 having a diameter.
Moreover, since the water stop material 19 has flexibility even if it becomes solid again after heating, it can be deformed following an elastic water stop member such as the grommet 13, and the water stop performance between the elastic water stop member and the elastic water stop member. It is difficult to generate a gap that lowers the water resistance, and it is possible to maintain a watertight structure over a long period of time.

  Therefore, according to the water stop part forming method of the wire harness 11 according to the present embodiment, the water stop material 19 and the wire harness 11, the handleability of the water stop material 19 can be improved, and the water stop between the electric wires 31 can be improved. The material 19 can be reliably and efficiently filled.

  In addition, according to above-mentioned embodiment, the solid water-stop material 19 shape | molded in the tape shape is bonded together so that the electric wire 31 may be pinched | interposed on the both sides of the electric wire 31 extended to the up-down direction. However, a single water-stopping material 19 is bonded so as to make a round around the electric wire 31 separated in the vertical direction, or two upper and lower portions of the electric wire 31 separated in the vertical direction are attached to the two pieces. The water material 19 may be folded into an inverted U shape and a U shape and bonded together.

(Second Embodiment)
Furthermore, as shown to Fig.11 (a), you may coat | cover the solid water stop material 19 which has the softness | flexibility shape | molded in the tape shape around each of the electric wire 31 separated in the up-down direction. .
Then, as shown in FIG. 11 (b), while heating both sides of the plurality of electric wires 31 aligned one by one vertically with the heating and pressing plates 41 of the pair of holders 39 of the heating and pressing means 23. Pressurize. Thereby, the water stop material 19 wound around each electric wire 31 separated so as to be lined up one by one melts in a state in which fluidity that does not drip occurs. Thereby, the water stop material 19 can be impregnated between each electric wire 31 reliably and efficiently.

Next, as shown in FIG. 12A, the plurality of electric wires 31 in one vertical row impregnated with the water blocking material 19 are converged into the electric wire bundle 46. Since the water-stopping material 19 is self-bonding even at room temperature, when the electric wire bundle 46 is converged after cooling, the water-stopping material 19 touches and comes into close contact with each other. The gap between the water blocking materials 19 can also be reliably filled.
From this state, as shown in FIG. 12 (b), the water stop sheet 49 is wound around and fixed around the portion of the wire bundle 46 impregnated with the water stop material 19, thereby stopping the water harness 11 at a predetermined position. Part 18 is formed.
Moreover, in the said embodiment, when distributing the some electric wire 31 of the electric wire bundle 33 vertically, it distribute | distributed equally in two right and left rows, but it does not need to be equal, Furthermore, even if it distributes to one row or three or more rows. Good.

  In addition, the water-stop part forming method, the water-stop material, and the wire harness of the wire harness of the present invention are not limited to the above-described embodiments, and can be appropriately modified and improved. 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.

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

  FIG. 15 is a plan view showing a portion of the wire harness according to the third embodiment of the present invention in which the left and right rows of converged wires are further converged into one and impregnated with a water stop material. FIG. 16 is a plan view showing a state in which a water stop sheet is wound around a portion impregnated with the water stop material of FIG. FIG. 17: is a longitudinal cross-sectional view which shows the state which penetrated the water stop part of the wire harness explaining 3rd Embodiment to the wire harness penetration part of a grommet. FIG. 18 is a cross-sectional view of the electric wire in a state where there is no water stop material in the gap between the electric wires.

  As shown in FIG. 17, in the third embodiment, the storage portion 15 </ b> A is formed in the wire harness penetration portion 15 of the grommet 13. The storage portion 15A is formed in a cylindrical shape having a larger diameter than other portions of the wire harness penetration portion 15, and the water stop treatment described in the first embodiment is performed in the storage portion 15A. The water stopping part 17 of the wire harness 11 can be stored. The method of applying a water stop treatment to the wire harness 11 in the third embodiment is different from the first embodiment in the process of inserting the wire harness 11 into the grommet 13. That is, in this step, 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 13 and the water stop part 17 is accommodated in the accommodation part 15A of the wire harness penetration part 15. Let

  In 1st Embodiment mentioned above, the water stop processing structure which can be filled with the water stop material 19 between each electric wire 31 reliably and efficiently was demonstrated. However, when the water stop portion 17 is applied to the excessive pressure from the outer peripheral side when the grommet 13 is inserted through the wire harness penetration portion 15, the electric wires 31 come close to each other, and the water stop material 19 passes through the gap between the electric wires 31. The water stop effect by the water stop material 19 may be weakened by being pushed out (contact point 32 in FIG. 18).

  Therefore, in the third embodiment, the inner diameter of the storage portion 15A formed in the wire harness penetration portion 15 is appropriately adjusted to a preferable one, so that when the grommet 13 is inserted through the wire harness penetration portion 15, water is stopped from the outer peripheral side. The pressure applied to the portion 17 is made moderate. Specifically, the inner diameter of the storage portion 15A in a state where the water stop portion 17 is not stored is smaller than the outer diameter of the water stop portion 17 and when the water stop portion 17 is stored in the storage portion 15A. The water stop material 19 is large enough not to be pushed out from the gap between the electric wires 31.

  In 3rd Embodiment, 15 A of storage parts in which the internal diameter was formed in this way, and the water stop part 17 which demonstrated the structure in 1st Embodiment cooperate, and the electric wires 31 and electric wires 31- Water stopping between the wire harness penetrating portions 15 with a high water stopping effect without any gaps, and applying an appropriate pressure to the water stopping portion 17 by eliminating the case where the water stopping portion 17 is subjected to an unusual pressure Can do.

Next, the water stop processing method at the time of using the grommet 13 which has 15 A of accommodating parts is demonstrated.
Next, the process of forming the water stop part 17 in the predetermined position of the wire harness 11 is demonstrated with reference to FIG.15 and FIG.16. Here, steps different from the series of steps described in the first embodiment will be described.

  As shown in FIG. 5, the left and right electric wires 31 impregnated with the water blocking material 19 are folded and laminated to converge to the left and right electric wire bundles 45. It converges to form one wire bundle 33. In addition, by this process, the water stop material 19 assumes that it accommodates in the accommodating part 15A of the grommet 13, and makes it the amount of the grade which fills the inside of the accommodating part 15A affixed on the electric wire 31. . At this time, since the water-stopping material 19 has self-bonding property even at room temperature, when the left and right electric wire bundles 45 are converged to one after cooling, the water-stopping materials 19 are in contact with each other and are in close contact with each other. A gap between the electric wire 31 and the water stop material 19 or between the water stop materials 19 can also be reliably filled.

  From this state, as shown in FIG. 16, a water-stop sheet 49 made of ethylene / propylene rubber is wound around the portion of the wire bundle 33 impregnated with the water-stop material 19. Since the water stop material 19 protrudes from the surface of the wire bundle 33, the water stop sheet 49 also protrudes at a location where the water stop material 19 is located. Thereafter, as shown in FIG. 8, the water stop portions 17 are formed at predetermined positions of the wire harness 11 by winding the tapes 51 around both ends of the water stop sheet 49.

  As shown in FIG. 17, the water harness penetration part 15 is stopped by fitting the water stop part 17 of the wire harness 11 in close contact with the storage part 15 </ b> A in the wire harness penetration part 15 of the rubber grommet 13. Water treated.

  Here, the water stop part 17 is not excessively compressed by the wire harness penetration part 15 by being accommodated in the accommodating part 15A.

  By the way, when the wire harness 11 is inserted into the wire harness penetration part 15 where the storage part 15A is not provided and the water stop part 17 is arranged in the wire harness penetration part 15, the water harness penetration part 15 is provided in the water stop part 17. Can be overstressed. Then, in the water stop part 17 by this compression, the water stop material 19 is extruded from between the electric wires 31, and there exists a possibility that the water stop effect may reduce.

  On the other hand, in 3rd Embodiment, the water stop part 17 is not excessively pressed by the wire harness penetration part 15 because the water stop part 17 is accommodated in the accommodating part 15A. In the water part 17, the water stop material 19 is maintained in a state where the water stop material 19 is fused to each other with an appropriate pressure, and the water stop material 19 remains around each electric wire 31, so that a good water stop effect can be obtained.

  Thus, in 3rd Embodiment, the water stop materials 19 wound around each electric wire 31 can be united by fusing together, and the electric wires 31 can be water-stopped with a high water stop effect without a gap. .

  Moreover, since the water stop part 17 which this water stop material 19 melt | fused is accommodated in the accommodating part 15A provided in the wire harness penetration part 15 of the grommet 13, it penetrates in the wire harness penetration part 15 of the grommet 13. However, a load such as an excessively large pressure is not applied from the outer peripheral side. Therefore, the water stop material 19 must not be pushed out from between the electric wires 31, and a good water stop state can be maintained.

  Moreover, since the winding location of the water blocking material 19 around the electric wire 31 is specified as a position that can be stored in the storage portion 15A when it passes through the wire harness penetration portion 15, the water blocking material 19 can be wound in a wide range. It becomes unnecessary. Therefore, it is possible to reduce the amount of the water-stopping material 19 used and to save the space where the water-stopping material 19 is wound.

DESCRIPTION OF SYMBOLS 11 ... Wire harness 17 ... Water stop part 19 ... Water stop material 23 ... Heating and pressurizing means 25 ... One surface 27 ... Release paper 29 ... The other surface 31 ... Electric wire 33 ... Electric wire bundle 43 ... Electric wire row 49 ... Water stop sheet

Claims (6)

A step of routing each wire in a predetermined position of the wire bundle in which a plurality of wires are bundled in a vertical direction;
A step of covering each of the electric wires separated vertically with a solid water-proof material having flexibility formed into a tape shape;
A step of impregnating between the electric wires with the water stop material in which the water stop material is heated while being heated from the outside by a heating and pressurizing means, and the fluidity that does not drip is generated;
A method of forming a water stop portion of the wire harness, comprising: converging the plurality of electric wires impregnated with the water stop material and winding a water stop sheet to form a water stop portion. Distributing a predetermined position of a bundle of wires in which a plurality of wires are bundled into a plurality of wire rows, distributing each wire in each wire row in a vertical direction, and routing;
A step of coating each electric wire in each of the sorted electric wire rows with a solid water stop material having flexibility formed in a tape shape;
A step of impregnating between the respective electric wires in each of the electric wire rows with the water-stopping material in which the fluidity that does not drip by applying pressure while heating the water-stopping material from outside is heated;
A step of converging a plurality of the electric wires in each of the electric wire rows impregnated with the water stop material and forming a water stop portion by wrapping a water stop sheet. Forming method. A method for forming a waterstop part of a wire harness according to claim 1 or 2,
Use one of the water-stopping materials having adhesiveness covered with release paper, and stick the release papers after pasting the wires separated in the vertical direction on the other surface of the water-stopping material. A method for forming a water-stop portion of a wire harness, wherein the water-stop material is melted and impregnated between the electric wires by applying pressure while heating from the outside with the heating and pressurizing means in an attached state. A method for forming a waterstop part of a wire harness according to claim 1 or 2,
After winding the water-stopping material on each of the wires separated in the vertical direction, pressurizing while heating from the outside with the heating and pressurizing means to melt and impregnate the water-stopping material between the electric wires. A method for forming a water stop portion of a wire harness. Each electric wire at a predetermined position of the electric wire bundle in which a plurality of electric wires are bundled is spread up and down and impregnated with a water stop material between each of the separated electric wires, and then the plural electric wires are converged and stopped. A water-stop material used in a method for forming a water-stop part of a wire harness that forms a water-stop part by wrapping a water sheet,
Flow that does not drip by being pressed with heating and pressurizing means after it is solidified with flexibility and self-bonding property at room temperature formed into a tape shape, and bonded to each of the separated wires A water-stopping material characterized by being impregnated between the electric wires. The waterstop material according to claim 5,
After one surface is coated with release paper and the other surface is bonded to each separated electric wire, the fluidity that does not drip by being pressurized with heating and pressurizing means through the release paper is provided. A water stop material produced and impregnated between the electric wires .

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