JP2000340044A - Jig for wire waterproofing work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig capable of easily positioning and centering a sealing material threaded with wires and a heat-contraction tube. SOLUTION: This jig 20 is used for wire waterproofing work wherein a sealing material 10 formed of a thermoplastic material provided with wire insertion slots formed in parallel, wires are inserted into the wire insertion slots of a plurality of the sealing materials 10 according to the quantity of the wires of a wire harness, and thereafter the sealing materials 10 are covered with a heat-contraction tube and heated so that the sealing materials are melted to impregnate among the wires and the heat-contraction tube is tightly fitted to the circumferential surfaces of the wire group. The jig is provided with an annular cylindrical part 21 having an opening for wire harness insertion, a stopper part formed by being spaced apart at a predetermined dimension from one end of the cylindrical part in the lengthwise direction and an operation rod 22. The jig is mounted at a predetermined position of the wire harness, the end face of the sealing materials 10 is thrusted against the one end of the cylindrical part to position the sealing materials 10 and while keeping-this form, the heat-contraction tube is moved to cover the sealing materials 10 and the cylindrical part, and when the tip of the heat-contraction tube is thrusted against the stopper part, the lengthwise center of the heat-contraction tube is made coincident with the widthwise center of the sealing materials 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for waterproofing electric wires, and more particularly, to a wire harness to be routed to an automobile through a grommet, and inserting the grommet into a through hole in a vehicle body to insert the grommet into a vehicle. The present invention relates to a jig used for performing a water stopping operation of a group of electric wires passing through the grommet.

[0002]

2. Description of the Related Art Conventionally, as a method of waterproofing this kind of electric wire,
In U.S. Pat.
No. 27221, FIG. 7 and FIG.
As shown in (g), a method of waterproofing using a sealing material 1 in which a magnetic material is mixed with a thermoplastic base material is disclosed.

In the above method, as shown in FIG.
First, the heat-shrinkable tube 2 is put on the wire harness W / H. Next, a plurality of sealing members 1 are attached to a large number of electric wire groups by passing the electric wire w of the wire harness into the parallel grooves 1a of the sealing member 1 formed of a substantially comb-shaped block shown in FIG. As shown in (c), the plurality of sealing materials 1 are staggered at the waterproof position of the electric wire group. Then
As shown in FIG. 8D, the heat-shrinkable tube 2 is moved to cover the sealing material 1, and then heated to shrink the heat-shrinkable tube 2 so as to adhere to the wire group. Next, as shown in FIG. 8E, the sealing material 1 is applied in an AC magnetic field by applying a high frequency.
The magnetic material is induction-heated, and the heat is generated to dissolve the base material, thereby penetrating the sealing material between the electric wires. Then, FIG.
(F) As shown in (g), the grommet 3 is covered, and the wire group and the grommet are fixed with the tape 4.

[0004] In the above method, since the electric wire is passed through the groove of the sealing material, it has an advantage that the base material can be surely filled into the gap of the electric wire to achieve sealing, and a magnetic substance is mixed with the thermoplastic base material. Since the sealing material 1 is used, the base material can be dissolved by applying a high frequency, and there is an advantage that it is not necessary to dissolve the resin using a heating means such as a heater as in the related art.

[0005]

The above-mentioned sealing material 1 is attached to a wire group to be laid on a wire harness assembling work table at a place where a grommet 2 is attached and at a grommet 2.
Must be attached to a group of electric wires located in the small-diameter cylindrical portion 2a. When the sealing material 1 is staggered in two rows in the wire group of the wire harness W / H as shown in FIG. 8 (c), as shown in an enlarged view of FIG. Must be aligned with the center of the sealing material 1 in parallel.

However, the heat-shrinkable tube 2 is not shown in FIG.
As shown in FIG. 2B, when the sealing member 1 is shifted and put on the sealing member 1, the heat-shrinkable tube 2 is caught on the sealing member 1, and the sealing member 1 is easily shifted laterally. If the position of the sealing material 1 shifts, the position where the sealing material 1 melts and penetrates between the electric wires to be waterproof is shifted from a required position for attaching the grommet, and water leakage occurs when mounted on an automobile. There is. Therefore, it is necessary for an operator to visually confirm whether the position of the sealing material is not deviated from a predetermined waterproof position, which requires a lot of labor and makes it difficult to perform accurate positioning by visual confirmation. Note that the same phenomenon occurs even when the sealing materials 1 are not staggered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a jig capable of aligning a center position of a heat-shrinkable tube with a center position of a sealing material (sealing material) to a predetermined waterproof position. It is an issue.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a wire harness using a long block-shaped thermoplastic material made of a thermoplastic material having wire insertion grooves arranged in a substantially comb tooth shape. After passing the wires through the wire insertion grooves of the plurality of sealing materials according to the amount of the wires, heat-shrink the tubes by covering these sealing materials with heat, dissolve the sealing material and infiltrate between the wires, and heat-shrink the tubes. A jig used for an electric wire waterproofing operation for bringing the wire harness into close contact with the outer peripheral surface of the electric wire group. A stopper protruding at a position spaced a predetermined dimension from one end in the vertical direction, and an operating rod protruding at the other end of the cylindrical portion, and attached at a predetermined position of the wire harness, and a sealing material attached to the wire harness. The end face of When the sealing material is positioned by abutting against one end of the cylindrical portion, the heat-shrinkable tube is moved to cover the sealing material and the cylindrical portion in this state, and the end of the heat-shrinkable tube is abutted against the stopper portion. Further, the present invention provides a jig for waterproofing an electric wire in which the center in the length direction of the heat-shrinkable tube coincides with the center in the width direction of the sealing material.

The operating rod is used as a stopper, and a circumferential position confirmation line is provided on the outer peripheral surface of the cylindrical portion at the position of the protruding end of the stopper / operating rod, which is the abutting surface of the heat-shrinkable tube. . Alternatively, the stopper portion is provided with a step on the outer peripheral surface of the cylindrical portion so as to protrude therefrom.

As described above, before moving the heat-shrinkable tube so as to cover the sealing material, the jig is externally fitted to the wire harness in the front in the moving direction. The jig is moved on the wire harness with the operation rod of the jig, and the end face of the sealing material is brought into contact with the end face of the cylindrical portion of the jig. Next, the heat-shrinkable tube is moved so as to cover the sealing material and also cover the cylindrical portion, and the tip is abutted against the stopper portion. At this time, even if the heat-shrinkable tube is caught on the sealing material, the sealing material does not move because it abuts on the tip of the cylindrical portion. The center of the heat-shrinkable tube and the center of the sealing material can be automatically matched with the end of the heat-shrinkable tube abutting on the stopper.

When a plurality of seal members to be attached to the wire harness are staggered in two adjacent rows, the length L1 from the other end of the cylindrical portion to the stopper / operating rod is determined by the length of the heat shrink tube. A length (L1 = L2 / 2-D) obtained by subtracting the width D of the sealing material from 1/2 of the length L2 is set so that the center of the two rows and the center in the length direction of the cylindrical portion coincide with each other, and The opening provided on the outer peripheral surface of the cylindrical portion is set to be less than half a circumference.

When the above-mentioned jig is used, the center position between the heat-shrinkable tube and the two rows of seal members can be matched when the seal members are staggered and attached to the wire group. In addition, by setting the opening for inserting the wire harness to be less than or equal to half the circumference of the cylindrical portion, the cylindrical portion end faces can be abutted on both sides in the length direction of the long sealing material.

When the stopper portion serving as the abutting surface of the heat-shrinkable tube also serves as the operating rod, a circumferential position confirmation line is provided on the outer peripheral surface of the cylindrical portion at the position of the projecting end of the operating rod. In other words, it is possible to see at a glance whether the line and the end face of the heat-shrinkable tube match or are different.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A, 1B, and 1C show a jig 20 according to a first embodiment of the present invention, which is a circular ring-shaped wire harness external fitting cylindrical portion having a wire harness insertion opening 21a in a part thereof. 21 and a stopper / operating rod 22 protruding from one end in the longitudinal direction of the cylindrical portion 21.

The jig 20 is, as shown in FIGS.
A plurality of seal members 10 are attached to the wire group of the wire harness W / H, and these seal members 10 are attached to the wire harness W / H.
It is used for a staggered arrangement in two rows at the waterproof position. Therefore, the length L1 from the other end 21b of the cylindrical portion opposite to the mounting position of the stopper / operating rod 22 to the stopper / operating rod 22 is １ ／ of the length L2 of the heat-shrinkable tube 11 that covers the sealing material 10. Is set to a dimension (L1 = L2 / 2-D) obtained by subtracting the width D of the sealing material 10 from the above. Also,
The opening 21a for inserting the wire harness is provided over the entire length in the length direction of the cylindrical portion 11, but is not more than a half circumference so that the wire harness can be inserted.

Further, a circumferential position confirmation line 23 is provided on the outer periphery of the cylindrical portion 21 at the position of the protruding end of the stopper / operating rod 22 which serves as the abutting surface of the heat-shrinkable tube 11. The line 23 is made to stand out by drawing a line with, for example, red paint.

As the sealing material 10, a sealing material obtained by mixing a magnetic substance with a thermoplastic base material similar to the sealing material 1 of the conventional example is used. Polyethylene, polyamide or the like is used as the thermoplastic base material of the sealing material, and nickel or the like is used as the magnetic material. When a high frequency is applied to the sealing material 10, the magnetic material is induction-heated in an alternating magnetic field, and the heat is generated to melt the base material, and at the same time, the fitted heat-shrinkable tube 11 is thermally shrunk. After the heat-shrinkable tube 11 is shrunk by a heater or the like so as to be in close contact with the outer peripheral surface of the wire group, the sealing material 10 may be melted by applying a high frequency.

As shown in FIG. 2A, the shape of the sealing material 10 is substantially comb-like, and a partition plate portion 10b is protruded from the flat connecting substrate portion 10a at a predetermined interval. At the ends of these partition plates 10b, a mountain-shaped protrusion 10c is provided, and the adjacent mountain-shaped protrusion 10c is brought close to the lower side, and
a, a partition plate portion 10b, and a chevron-shaped protrusion 10c, and a block shape in which wire insertion grooves 10f in which front and rear sides are wire insertion openings 10e are juxtaposed.

As shown in FIGS. 2 (B) and 2 (C), the electric wire w is passed through the electric wire insertion space 10f by pushing and opening 10g between the adjacent chevron-shaped protrusions 10c with respect to the sealing material 10. In the case of one thin wire w-1, a plurality of wires are passed through one wire insertion space 10f, and one wire is passed in the case of a thick wire w-2. Since the wire harness to which the grommet is attached has a large number of electric wires, a plurality of seal materials 10 are used.

The above-mentioned sealing material 10 is applied to a wire group W which is supported and wired by a wiring jig on a wire harness assembling work table (not shown). Mounted in orthogonal direction. At this time, when all the electric wires are passed through the electric wire insertion groove 10f of the seal material 10, another seal material 10 is passed through the electric wire. In this manner, a plurality of sealing materials 10 are attached according to the number of electric wire groups, and in this embodiment, five sealing materials 10 are attached, and two rows adjacent to each other at the waterproof position where the grommet is attached as shown in FIGS. , Staggered arrangement.

A heat shrink tube 11 is attached to the wire group of the wire harness in advance, and after the seal material 10 is attached to the wire group in a staggered arrangement, as shown in FIG. The jig 20 is externally fitted to the wire group W in front of the moving direction indicated by the arrow so as to cover the wire group W. An operator grasps the stopper / operating rod 22 of the jig 20 with his / her hand and moves it over the wire group. As shown by a dashed line in FIG. The jig 20 is rotated and positioned so that the tip of the cylindrical portion 21 hits both sides in the length direction.

After the tip of the cylindrical portion of the jig 20 is brought into contact with the sealing material 10, the heat-shrinkable tube 11 is moved in the direction of the arrow X to cover the sealing material 10 and the cylindrical portion 21 of the jig 20.
And the tip 11a is used as a stopper / operating rod 22.
And stop. At this time, the tip 11a and the line 1
3, the line 13 is hidden, but if the line 13 is exposed, the heat-shrinkable tube 11 is slightly moved until the line 13 is hidden.

Even when the heat-shrinkable tube 11 is caught by the seal material 10 when the heat-shrinkable tube 11 is moved, the seal material 10 does not move because it abuts on the distal end 21b of the cylindrical portion. Heat shrink tube 1
4A, the center of the heat-shrinkable tube 11 and the center of the first row and the second row of the sealing material 10 are automatically placed in a state where the tip 11a of the first abuts against the stopper / operating rod 22 as shown in FIG. Can be matched.

After the center position of the sealing material 10 and the heat-shrinkable tube 11 is adjusted by the jig 20, the jig 20 is removed from the wire group 20 through the opening 21a. Thereafter, when a high frequency is applied from the outside of the heat-shrinkable tube 11, the magnetic material of the sealing material 10 is induction-heated in an AC magnetic field, and the heat is generated, thereby dissolving the thermoplastic base material.
It penetrates between wires. In addition, the heat-shrinkable tube 11 is also heated and shrunk by the heat generated by the sealing material, and adheres to the outer periphery of the wire group. In addition, if a material obtained by mixing a magnetic material is used for the heat-shrinkable tube, the heat-shrinkable tube can be reliably shrunk by heating by applying high frequency.

When the sealing material 10 is melted, the sealing material 1
By arranging the 0s in a staggered manner, the permeability of the sealing material is good, there is no gap between the electric wires, and the electric wires can be reliably stopped.

Next, a grommet (not shown) is attached to the wire group, and the small-diameter tubular portion is brought into close contact with the outer peripheral surface of the heat-shrinkable tube 11, and then the tip of the small-diameter tubular portion and the wire group are fixed by tape winding. . If the heat-shrinkable tube is externally fitted to the wire group so as not to move when the grommet is put on the grommet, the sealing material 10 may be melted by applying high frequency after attaching the grommet.

In the above embodiment, a magnetic material is mixed with a thermoplastic base material to dissolve the thermoplastic base material at a high frequency as the seal material 10, but the seal material is formed only of the thermoplastic base material. May be used. In this case, since it is necessary to heat the sealing material to dissolve it, after covering the heat-shrinkable tube or grommet, the mounting portion of the sealing material is heated by a heating means such as a heater to remove the sealing material. It is melted and the gap between the wires is filled with a sealing material.

As described above, regardless of whether the sealing material is made of only a thermoplastic material or made of a thermoplastic material mixed with a magnetic material, the centering of the sealing material and the heat-shrinkable tube covering the sealing material is performed. Can be easily and accurately performed.

In the above embodiment, the seal members are arranged in a staggered manner in the electric wire group, but as shown in FIG.
Even when the wires are arranged in a line in the wire group W, the positioning of the sealing material 10, the positioning of the heat-shrinkable tube 11, and the centering of the sealant 10 and the heat-shrinkable tube 11 are performed by using the jig 20. be able to.

FIG. 6 shows a second embodiment of the jig. The stopper for abutting the heat-shrinkable tube 11 is not used also as an operating rod, and is located at a predetermined distance from the tip of the cylindrical portion 21 '. A stopper portion 23 is provided, which protrudes in a stepped manner over the entire surface. An operating rod 24 is separately provided at the other end of the stepped portion. In this manner, when the step-like stopper portion 23 is provided, the heat-shrinkable tube 11 can be positioned and held by settling the heat-shrinkable tube 11 with the sealing material 10 by abutting the tip of the heat-shrinkable tube 11 against the stopper portion 23.

[0031]

As is clear from the above description, when the jig according to the present invention is used, the sealing material attached to the waterproof position of the electric wire group, the center position of the heat-shrinkable tube over the sealing material, and the sealing material Can be easily and reliably aligned with the center position of the camera. Therefore, the waterproof function in the grommet can be improved, and it is possible to reliably prevent the occurrence of water leakage when the grommet is mounted on an automobile.

As described above, since the sealing member and the heat-shrinkable tube can be accurately positioned by using the jig, conventionally,
It is possible to omit the visual check work performed by the worker, and to improve the productivity of the wire harness.

[Brief description of the drawings]

FIG. 1 shows a jig according to a first embodiment of the present invention, and (A)
Is a perspective view, (B) is a rear view, and (C) is a side view.

FIGS. 2A and 2B show a sealing material used in the present invention, wherein FIG. 2A is a perspective view of the sealing material, FIG. 2B is a perspective view showing a state where electric wires are passed through the sealing material, and FIG. It is an expanded sectional view of.

FIG. 3 is a perspective view showing a state where the jig is attached to a group of electric wires.

FIG. 4A is a plan view showing a state in which a sealing material is positioned by a jig, and FIG. 4B is a plan view showing a state in which a heat-shrinkable tube is positioned by a jig.

FIG. 5 is a drawing showing a modification.

6A and 6B show a second embodiment of the jig, wherein FIG. 6A is a perspective view and FIG. 6B is a cross-sectional view.

FIG. 7 is a cross-sectional view of a conventional sealing material.

FIGS. 8A to 8G are views showing a conventional waterproofing method.

FIGS. 9A and 9B are enlarged plan views showing a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Seal material 11 Heat-shrinkable tube 20 Jig 21 Tubular part 21a Opening 22 Stopper and operation rod W Wire group W / H Wire harness

Claims (4)

[Claims] An elongated block-shaped thermoplastic sealing material having a substantially comb-shaped parallel wire-inserting groove is used, and a plurality of sealing materials are inserted into the wire-inserting groove according to the amount of wires in the wire harness. After passing the electric wires, these sealing materials are covered with a heat shrinkable tube and heated, and the sealing material is melted and penetrated between the electric wires, and at the same time, used for a wire waterproofing operation in which the heat shrinkable tubes are brought into close contact with the outer peripheral surface of the wire group. A toroidal wire harness external fitting cylindrical portion having a wire harness insertion opening in a part thereof, and a stopper protruding at a position spaced apart from a longitudinal end of the cylindrical portion by a predetermined dimension. Part, and an operating rod protruding from the other end of the cylindrical part. The operating rod is attached to a predetermined position of the wire harness, and an end surface of the seal material attached to the wire harness is abutted against one end of the cylindrical part to seal the seal material. Positioning, When the heat-shrinkable tube is moved to cover the sealing material and the cylindrical portion in the state described above, and the tip of the heat-shrinkable tube is brought into contact with the stopper portion, the center in the longitudinal direction of the heat-shrinkable tube and the width direction of the seal material Jig for waterproofing electric wires set so that it matches the center of the wire. 2. The method according to claim 1, wherein the operating rod is used as a stopper.
2. The wire waterproofing jig according to claim 1, wherein a circumferential position confirmation line is provided on the outer peripheral surface of the cylindrical portion at a position of a protruding end of the stopper / operating rod, which is a contact surface of the heat shrink tube. Utensils. 3. The electric wire waterproofing jig according to claim 1, wherein the stopper is provided with a step on the outer peripheral surface of the cylindrical portion. 4. When a plurality of seal materials to be attached to the wire harness are arranged in a staggered manner in two adjacent rows, the length L1 from the other end of the cylindrical portion to the stopper / operating rod is determined by the heat shrinkage. The length (L1 = L2 / 2-D) obtained by subtracting the width D of the sealing material from 1/2 of the length L2 of the tube is set so that the center of the two rows and the center in the length direction of the cylindrical portion coincide. The jig for waterproofing electric wires according to any one of claims 1 to 3, wherein an opening provided on an outer peripheral surface of the cylindrical portion is not more than a half circumference.