JPH06333433A - Grommet integrated wire harness and forming die and method therefor - Google Patents

Abstract

PURPOSE:To obtain a forming die and method for molding a grommet integrated wire harness having the excellent water-proof property and the excellent field workability. CONSTITUTION:A grommet integrated wire harness 10 is formed of a wire harness 12, which is made of a bundle of wires 16, and a grommet 14 for holding the wire bundle of this wire harness 12 under the condition that the wire bundle is passed through a hole of a partitioning wall B. The grommet 14 is provided with a skirt part 20, which is continued from a head part, and a fitting part 22 formed in the periphery of this skirt part and to be fitted to the partitioning wall. The head part of the grommet 14 is formed of a peripheral part 18A for surrounding the periphery of the wire harness 12 and a center part 18B for filling a space between the wires of the wire bundle of the wire harness 12, and these peripheral part 18A and the center part 18B are made of the same material and formed integrally. The wires of the wire harness 12 is passed through the head part under the condition that they adhered to the material forming the head part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention according to claim 1 relates to a grommet-integrated wire harness in which a grommet is integrally formed with a wire harness, and more specifically, a grommet excellent in waterproofness and easy to be installed on site. The present invention relates to an integrated wire harness. The present invention also relates to a mold suitable for molding the grommet-integrated wire harness according to the invention, and a method for molding the grommet-integrated wire harness according to the invention.

[0002]

2. Description of the Related Art A grommet is a grommet that holds a wire harness against a partition wall and penetrates through the hole in the partition wall and the inside of the wire harness when a wire harness consisting of a large number of wire bundles or assembled wires is passed through the hole in the partition wall. It is a component used to prevent water inside and outside from entering and exiting through the gaps, and is widely used especially in the field of electric wiring in automobiles. For example, in an automobile, a hole is provided in a partition wall that separates the engine room from the passenger compartment, a wire harness is passed through the hole, and moisture or odor may flow from the engine room into the passenger compartment through the penetrating portion. Need to be there. In such cases, grommets are used.

The grommet, when viewed in cross section, usually has a shape such as a grommet A ₁ shown in FIG. 7 (a). Grommet A ₁ is, as shown in FIG.
A hollow head portion 18 and a skirt portion 20 continuous with the hollow head portion 18 are provided, and an engaging portion 22 having an annular recess is provided on the outer periphery of the skirt portion 20. FIG. 7B shows that the grommet A ₁ shown in FIG. 7A is attached to the wire harness 12,
It is sectional drawing which shows the state which made the partition wall B penetrate the wire harness 12. As shown in FIG. 7 (b), the grommet A ₁ surrounds the wire harness 12 penetrating the hole B of the partition wall with the inner wall of the head 18, and the engaging portion 22 covers the hole of the partition wall B. Engage to hold the wire harness 12 against the hole. The grommet is generally made of a material having excellent flexibility such as rubber so that it can be easily inserted into the hole of the partition wall B, and is formed into a shape that can be relatively freely deformed, so that the grommet can be inserted into the hole of the partition wall B. It is made easy and can be closely attached to and locked on the wall of the hole.

By the way, the grommet A ₁ as shown in FIG. 7A is not convenient to use. For example, when attaching the grommet A ₁ to the wire harness 12,
In order to pass the wire harness 12, the grommet head 18 had to be expanded in diameter by using a grommet switch, which was cumbersome and inefficient. Further, in order not to significantly impair the waterproofness of the inside and outside of the partition wall B, as shown in FIG. 7 (b), the wire bundle near the head 18 of the grommet A ₁ is wound tightly with vinyl tape C or the like to be tightly packed. I had to put it together. With this, the number of man-hours for attaching the grommet increases, and it is not possible to obtain satisfactory waterproofness.

As a means for improving the waterproofness, for example, the technique described in Japanese Utility Model Laid-Open No. 59-152785 is known. In the grommet A ₂ described in the above publication, as shown in FIG. 8, the wire harness 12 is passed through an electric wire insertion hole formed by a diameter-expanded hole D and a diameter-reduced hole E that is connected to the diameter-expanded hole D. At the same time, the liquid resin F is poured into the diametrically expanded portion D in the skirt portion 20 without any gap, and is filled and cured.
In order to make the penetrating portion of the partition wall B a waterproof structure by using the grommet A ₂ , the reduced diameter hole E and the wire harness 12
A slight gap between the wire harness 12 and
Even if there is a gap between the electric wires 16 of the
It is necessary to seal with. However, in actuality, it is difficult to realize satisfactory waterproofness by completely sealing the gap by not injecting the liquid resin F into the gap simply by injecting the liquid resin F into the enlarged diameter hole D. It was

Therefore, in order to widen the gap and make it easier to fill the liquid resin, for example, Japanese Utility Model Publication No. 5-1945, FIG.
(A) Proposed to bend the electric wire 16 of the wire harness 12 into various shapes to secure a space into which the liquid resin can flow, as indicated by a reference symbol H, and the actual open flat 1-582.
No. 23 is a wire harness 1 as shown in FIG.
It is proposed that a small ring I be attached to each of the electric wires 16 of No. 2 to secure a space into which the liquid resin can flow.

[0007]

However, none of these conventional grommets or the proposed grommets has yet to satisfy the requirement for waterproofness as the first problem. It is the reduced diameter hole E in FIG.
This is because it is difficult to completely close the slight gap between the wire harness 12 and the wire harness 12 and the gap between the wires of the wire harness 12 with the liquid resin F, and moreover, the adhesiveness between the grommet and the liquid resin is high. Because it is scarce, voids remain in that part. A second problem is that the conventional grommets or the proposed grommets have poor on-site workability or usability. That is, when inserting the wire harness into the grommet, it is necessary to expand the diameter of the grommet, and also to attach the grommet to the wire harness and before or after attaching it to the hole in the partition wall, liquid form the grommet. That is, it is necessary to inject resin. It is extremely troublesome to perform such work on site each time, and it has not been possible to improve the efficiency of the work for attaching the wire harness.

In view of the above problems, the first object of the present invention is to:
An object of the present invention is to provide a grommet which is excellent in waterproof property and has a good site construction property. Further, a second object is to provide a mold suitable for molding such a grommet, and a third object is to provide a method capable of economically molding such a grommet.

[0009]

Means for Solving the Problems As a result of various studies on the above-mentioned problems, the inventors have produced a grommet separately from a wire harness, penetrate the wire harness into the grommet and attach it to a partition wall on site, and then As long as the method of encapsulating with a liquid resin is used to create a waterproof structure, we conclude that satisfactory waterproof performance cannot be achieved and that site workability is poor, and we research a grommet-integrated wire harness that replaces it. Then, the present invention was completed.

Based on these findings, in order to achieve the above object, the grommet-integrated wire harness according to the present invention has a wire harness consisting of an electric wire bundle and the electric wire bundle of the wire harness which is passed through a hole in a partition wall. Consisting of a grommet that is held in a state, the grommet is provided with a head and an engaging portion that engages with the partition wall, and the grommet head has an outer peripheral portion that surrounds the outer periphery of the wire harness. It is characterized in that it is formed of a central portion that fills the space between the electric wires of the electric wire bundle of the wire harness, and that the outer peripheral portion and the central portion are integrally formed of the same material.

The present invention can be applied to wire harnesses of any kind and specifications, and can be applied without problems even if parts such as connectors are attached to the ends of the wires of the wire harness.

In the present invention, preferably the grommet is
Molded with resin in the mold. The resin to be used is composed of one-, two-, or more liquid raw materials, is liquid at room temperature or slightly heated, and can be a high molecular weight liquid when injected into a mold and cured. Resin is desirable. For example, a resin obtained by mixing a predetermined amount of an active hydrogen-containing compound and a polyisocyanate compound, which is generally called a thermosetting polyurethane resin, and a heat obtained by mixing a predetermined amount of an organopolysiloxane and a hydrogen polysiloxane. Examples thereof include a curable silicone rubber, and an epoxy resin obtained by mixing a main agent having an epoxy group in one molecule with a curing agent such as an amine compound in a predetermined amount. Incidentally, in the range not impairing the effects of the present invention, to reduce the weight by adding a foaming agent to the liquid resin, to reduce the material cost by adding a filler, further flame retardant, antiaging agent, antifungal agent, pigment ( It is also possible to improve the properties such as functionality by adding additives such as carbon).

When the electric wire constituting the wire harness is covered with vinyl chloride resin, the resin forming the molded body contains thermosetting polyurethane resin as a main component and contains a plasticizer for vinyl chloride resin. Is desirable. As the plasticizer, it is desirable to use the same or similar one as the one mixed with the vinyl chloride resin used for coating the electric wire.
More preferably, as in this Example described later, a thermosetting polyurethane resin is used as a main component, and a plasticizer for vinyl chloride resin such as dioctyl phthalate (DOP) and phthalic acid ester is contained in an amount of 3 to 20% by weight. A polyurethane resin whose hardness of the resin molded body after curing is JIS A40 to 70 is used. Such a polyurethane resin is excellent in wettability with a wire harness in a liquid state, and thus has good adhesion, and has high filling airtightness, which improves waterproofness, and is rich in rubber elasticity even after curing, Because it is freely deformable, it can be easily inserted into the hole of the partition wall.

The shape of the grommet can be any shape, but a preferable shape is such that the head of the grommet and the engaging portion are provided at positions separated from each other in the direction of the center line of the grommet. is there.

In order to mold the grommet-integrated wire harness, the molding die according to the present invention is a molding die including an upper die and a lower die which cooperate to form a cavity for integrally molding the grommet with the wire harness. In the mold, the cavity includes a grommet portion having the same contour as the grommet, an upper through hole extending upward of the grommet portion and a lower through hole extending downward for placing the wire harness therethrough. The side through hole is characterized in that the inner surface thereof is formed in a size that makes close contact with the wire harness.

Preferably, as in this embodiment described later,
The upper mold and the lower mold are divided into, for example, the upper mold and the lower mold so that the upper mold forms the upper contour wall of the cavity and the lower mold forms the lower contour wall of the cavity. It is formed in a half-split type, which is divided in two by a plane passing through the center line.
Furthermore, the liner for guiding the liquid resin into the cavity is
It may be provided so as to descend from a resin injection port provided on the upper surface of the upper mold, and then extend along a surface that is vertically divided to communicate with the cavity. A ring-shaped packing having an inner diameter substantially the same as the outer diameter of the wire harness may be attached to the inner surfaces of the upper through hole and the lower through hole. Further, the upper mold and the lower mold may be provided with a mold clamping means for clamping the half mold.

As described above, the molding die is divided into the upper and lower parts along the liner, and is further divided into the upper mold part and the lower mold part which are divided into two parts along the plane passing through the center line of each through hole. Wire harnesses of various specifications can be easily set in the mold and the molded product can be easily taken out. Excessive leakage of the liquid resin from the cavity is suppressed by the ring-shaped packings provided in the upper through hole and the lower through hole. Since the injection port is in the upper mold, the liquid resin injected into the cavity can be prevented from flowing out from the injection port.

In forming the grommet-integrated wire harness, the liquid resin is simply poured into the cavity and no resin pressure is particularly required. Therefore, the material of the forming die is not particularly limited, and a light metal such as aluminum or silicone is used. A lightweight molding die made of hard synthetic resin such as resin or wood can be used. Further, as the mold clamping means, ordinary means such as a clamp is sufficient. The half mold does not necessarily have to divide the upper mold or the lower mold into two equal parts, and can be divided into any shape as long as it passes through the center line of each through hole.

Preferably, the ring-shaped packing mounted in the lower through hole tightly tightens and seals the wire harness. With this configuration, the liquid resin injected into the cavity is prevented from flowing down through the wire harness. On the other hand, it is preferable that the ring-shaped packing attached to the upper contour wall is looser than the ring-shaped packing of the lower contour wall. If the lower packing is made tight and the upper packing is made loose in this manner, the tendency of the liquid resin to flow upward becomes stronger, so that the defective shape of the head of the molded grommet can be prevented.

As a preferred embodiment of the mold according to the present invention, in the upper mold of the mold, an excess injection material reservoir capable of accommodating a liquid resin is provided at the upper end of the liner to be used as a resin injection port, and the excess liquid is used. It is good to store resin. Further, the diameter of the upper through hole may be increased to form a surplus material reservoir.

The method for molding the above-mentioned grommet-integrated wire harness includes (1) a step of setting the wire harness in the above-mentioned molding die and clamping, and (2) a liquid resin through a resin injection port of the upper die. Is poured into the grommet part of the cavity so that the grommet sticks to the outer circumference of the wire harness over the entire inner circumference at its head, and the wires of the wire bundle of the wire harness in the head are filled with liquid resin without any gaps. It is characterized in that it is provided with the steps.

At the time of molding, it is desirable to perform molding with the head side of the grommet facing upward so that the resin in the cavity can be minimized from flowing out through the wire harness.

[0023]

In the grommet-integrated wire harness of claim 1, resin is filled between the wires of the wire bundle of the wire harness in the head of the grommet without any gap, so that the grommet-integrated wire harness after molding is formed. There is no gap left. Therefore, there is no room for moisture to flow in and out, it has very excellent waterproofness, and there is no need to perform resin injection work on site. Further, unlike the conventional grommet, the work of expanding the diameter of the grommet head for inserting the wire harness is not required. The urethane grommet has appropriate flexibility and exhibits excellent durability against vibration and heat during use.

In the grommet-integrated wire harness of claim 4, the wire of the wire harness is covered with vinyl chloride resin, and the grommet is made of a resin containing a thermosetting polyurethane resin as a main component and a plasticizer for vinyl chloride resin. Since it is molded, the plasticizer in the vinyl chloride coating of the electric wire is suppressed from transferring to the thermosetting polyurethane resin forming the grommet. Therefore, the stability and the electric insulation of the wire harness can be favorably maintained for a long period of time.

In the grommet-integrated wire harness of claim 5, since the grommet head and the engaging part are separated from each other in the center line direction, if the head is turned up, the wire harness is transmitted along the wire harness. Even if the resin therein flows out, the material of the engaging portion does not flow out. Therefore, it is possible to prevent a defective molding such that the engaging portion of the grommet is chipped due to lack of resin.

In the molding die of claim 6, the wire harness can be tightly tightened by the inner peripheral wall of the lower through hole, so that the outflow of the resin at the time of molding is reduced and the resin flows to the head side. Therefore, according to this molding die, it is possible to prevent a molding defect such as a part of the head of the grommet being chipped.

Since the molding die according to claim 7 can accommodate a sufficient amount of liquid resin by providing the excess material reservoir, after the liquid resin is injected, a part of the liquid resin travels down the electric wire of the wire harness and moves downward. Even when it flows down, the liquid resin naturally re-injects from the surplus material reservoir to make up for the shortage. Therefore, it is possible to prevent the liquid resin forming the grommet from being insufficient and to form a defective molded product such as a part of the grommet being chipped.

The molding method according to claim 8 comprises the steps of setting a molding die on the outer periphery of the wire harness, pouring the liquid resin, curing the resin, and then disassembling the mold. The production of grommets and the liquid resin in the gaps. Since filling and filling are performed in one step, the productivity is extremely high.

In the molding method of the ninth aspect, since the head of the grommet is molded upward, the resin can be suppressed from flowing out through the wire harness during molding to the minimum. Therefore, according to this molding method, it is possible to prevent a molding defect such as a part of the engaging portion of the grommet being chipped.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail based on embodiments with reference to the accompanying drawings. Molded Body of Grommet-Integrated Wire Harness FIG. 1 is a diagram showing a configuration of an embodiment of the grommet-integrated wire harness according to the present invention, FIG. 1 (a) is a side view, and FIG. 1 (b) is a diagram. 1A is a cross-sectional view taken along line XX, and FIG. 1C is a cross-sectional view showing a state in which the grommet-integrated wire harness of FIG. 1A is mounted on a partition wall. A grommet-integrated wire harness (hereinafter, simply referred to as “molded body” for simplification) 10 of the present embodiment is a bundle of electric wires 16, for example, a terminal of an electric device provided in a passenger compartment of an automobile when the automobile is taken as an example. And a wire harness 12 including a bundle of electric wires 16 for connecting terminals of an electric device in the engine room, and a grommet 14 integrally formed with the wire harness 12.

If necessary, parts such as connectors are connected to the ends of a large number of electric wires 16 constituting the wire harness 12. Further, in this embodiment, the electric wire 16 is insulation-coated with vinyl chloride resin. The grommet 14 is obtained by injecting a liquid resin into a molding die described later and is molded into a rotating body around the wire harness 12, and has a solid upper end 17 having a large outer diameter and a thick wall. Has a head portion 18, a skirt portion 20 continuous with the head portion 18, and an engaging portion 22 continuously provided on the outer circumference of the skirt portion 20. As shown in the cross section in FIG. 1C, the skirt portion 2
0 is thin and is formed in a skirt shape which is continuous with the head 18 and widens toward the end so as to be easily deformed. Further, the inside of the skirt portion 20 is hollow. An engaging portion 22 for engaging the hole wall of the partition wall B is formed on the outer surface thereof in the shape of an annular recess, and the outer diameter thereof is set to be slightly larger than the hole diameter of the partition wall B. . As shown in FIGS. 1A and 1C, the head 18 and the engaging portion 22 are formed at positions separated from each other in the direction of the center line of the grommet.

As shown in FIG. 1B, the grommet 14
The head portion 18 is composed of an outer peripheral portion 18A and a central portion 18B, and the outer peripheral portion 18A and the central portion 18B are formed of the same resin without forming a boundary (in FIG. ), The electric wire 16 of the wire harness 12 penetrates through it. In other words, the head 18 of the grommet 14
The resin forming it is in close contact with the outer periphery of the wire harness 12, and the wire bundle 1 of the wire harness 12 is
It is integrally formed with the wire harness 12 in such a form that there is no boundary between the resin filling the gap in 6 and the resin.

In this embodiment, the grommet 14 has a thermosetting polyurethane resin as a main component, and dityl phthalate (DO) used as a plasticizer for vinyl chloride resin.
P) or phthalic acid ester is contained in an amount of 3 to 20% by weight, and the molded body is cured with a polyurethane resin having a hardness of JIS A 40 to 70.

The molded body 10 is, as shown in FIG.
In the example of the automobile described above, the head portion 18 is inserted into the hole of the partition wall B that divides the interior of the automobile from the engine room while the skirt portion 20 is deformed, and the head portion 18 is leadingly inserted, so that the engaging portion 22 of the grommet 14 is inserted. Is fitted into the hole. Thereby, the wire harness 12 penetrates the partition wall B and is retained. still,
The shape of the grommet 14 described above is merely an example, and the shape is not limited to the shape of this embodiment, and may be any shape.

Since the molded body 10 is formed of the polyurethane resin having the above-mentioned hardness and being rich in rubber elasticity and having a relatively easily deformable shape as described above, it has appropriate mechanical strength, flexibility and deformability. It is equipped with excellent handling properties such as loading into the partition wall. In addition, the above-mentioned polyurethane resin has excellent wettability with the wire harness 12 in the liquid state and has good adhesiveness.
2 easily enters, and as a result, the filling airtightness is increased, and the airtightness and waterproofness are significantly improved.

In addition, since the above-mentioned polyurethane resin contains the plasticizer for vinyl chloride resin, the plasticizer in the vinyl chloride coating of the electric wire 16 of the wire harness 12 is transferred to the polyurethane resin side of the grommet. Therefore, the stability and electrical insulation of the vinyl chloride coating of the electric wire 16 can be favorably maintained for a long period of time, and the performance of the wire harness 12 can be stabilized for a long period of time.

Since the molded body 10 is integrally molded with the wire harness 12, the complicated work such as expanding the diameter of the wire harness and inserting the wire harness each time like a conventional grommet is performed. Making it unnecessary.
In addition, since the molded body 10 completely seals the penetrating portion with the resin as described above while holding the wire harness 12, for example, moisture and humidity or odor between the engine room and the passenger compartment of the automobile are not generated. Access can be prevented. In addition, in this grommet-integrated wire harness, only the head portion is formed solid, the inside of the skirt portion is hollow and thin, and the elasticity is maintained and it is easy to deform, so that the partition wall Easy to insert into the hole.

Molding Mold FIG. 2 is a view showing the constitution of one embodiment of the molding mold according to the present invention, and FIG. 3 is a cross-section of the molding mold showing a cavity formed by cooperation of an upper mold and a lower mold. It is a figure. As shown in FIG. 2 (c), the molding die of this embodiment is composed of a cylindrical upper die 30 and a cylindrical lower die 40 having the same diameter as the upper die 30. Reference numeral 30 is a pair of two identical half molds divided by the plane P ₁ shown in FIG. 2A, and similarly, the lower mold 40 is divided by the plane P ₂ shown in FIG. 2B. Each is made up of the same pair of half halves. Each of the two half molds is hinged to each other at one edge and clamped at the other edge so as to be united.

As shown in FIG. 2 (a), the upper mold 30 has a surplus material reservoir 34, which communicates from the upper part of the grommet part 32 through the upper through hole 33, with the grommet part 32 at the center. Similarly, an excess injection material reservoir 36 is also provided on the upper surface of the mold, and a descending liner portion 38 vertically descending from the excess injection material reservoir 36 is provided on both sides. In FIG. 2 (a), 37 is the above-mentioned hinge connection, and 39 is the clamp for clamping the mold. The grommet portion 32 has a shape of a rotating body around the center axis of the mold, and has an upper contour wall 3 having the same shape as the outer contour above the engaging portion 22 of the grommet 14 shown in FIG.
It is formed in a concave shape by reversing the mushroom.

The surplus material reservoir 34 is provided at a position higher than the upper end portion of the grommet portion 32. Excess injection material reservoir 3
Reference numeral 6 is a cylindrical recessed portion that is also symmetrically arranged about the surplus material reservoir 34 at a position higher than the upper end portion of the grommet portion 32, and stores an extra role of the injection port and the liquid resin to be injected. Perform a function. Further, the grommet portion 32
A ring-shaped packing 35 is attached to the upper through hole 33 that connects the tip of the and the excess material reservoir 34. The packing 35 is made of light rubber and is formed in a half ring shape in which a ring is divided into two parts, and each packing is mounted on each half mold. When the half molds are butted against each other on the plane P ₁ of FIG. 2A, the packing 35 is slightly smaller than or slightly larger than the outer diameter of the wire harness 12, and the wire harness 12 is inserted through the through hole 3
When penetrated through 3, it becomes a ring with an inner diameter such that its tightening is not so tight.

As shown in FIG. 2B, the lower mold 40 has a lower contour wall 41 having the same shape as the contour below the engaging portion 22 of the grommet 14 and subsequently to the inside contour of the skirt portion 20. A concave portion 42 and a convex portion 44 formed by
Further, a lower through hole 46 that vertically penetrates the central portion of the convex portion 44.
It has and. The lower contour wall 41 is formed symmetrically around the lower through hole 46. Also, the lower mold 40 is
A horizontal liner portion 48 that communicates with the lower end of the descending liner portion 36 of the upper mold 30 and that is connected to the recess 42 substantially horizontally is provided. Further, a ring-shaped packing 45 is attached to the upper end of the lower through hole 46. The packing 45 is made of light rubber and is formed in a half ring shape in which a ring is divided into two, and each is attached to each half mold. When the half molds are butted against each other on the surface of FIG. 2 (b), the packing 45 is
When the wire harness 12 is penetrated through the lower through hole 46 with an inner diameter smaller than the outer diameter of the wire harness 12, the tightening becomes a ring having a relatively tight inner diameter.
That is, the packing 45 of the lower mold 40 is formed so as to tighten the wire harness 12 more tightly than the packing 35 of the upper mold 30. In FIG. 2 (b), 47 is the above-mentioned hinge connection, and 49 is the clamp for clamping the mold.

The upper mold 30 and the lower mold 40 only need to have the strength to withstand the pressure of pouring the liquid resin. Therefore, a lightweight and easy-to-handle product made of aluminum or synthetic resin can be selected, and the mold clamping is also easy. As in the example, it is possible to adopt a method of clamping or screwing. As will be described later, when the wire harness 12 is inserted and then the upper mold 30 is set on the lower mold 40, a cavity 50 defining the same contour as the grommet 14 is formed as shown in FIG.

In this embodiment, the upper mold 30 and the lower mold 40 are
Since it is divided along the horizontal liner portion 48 and with the upper side surface and the lower side surface of the grommet 14 as a boundary, if the upper mold 30 and the lower mold 40 are separated vertically after molding, the molded body can be easily taken out. be able to. Since the upper mold 30 and the lower mold 40 are composed of a pair of half halves, even if parts such as a connector are attached to the ends of the electric wires 16 of the wire harness 12, the wire harness 12 can be easily set in the molding mold. it can. Further, in this embodiment, since the surplus material reservoir 34 and the excess injection material reservoir 36 are provided, a sufficient amount of the liquid resin can be accommodated. Even if the liquid resin flows downward from 46 through the electric wire 16 of the wire harness 12, the liquid resin naturally reflows from the surplus material reservoir 34 or the excess injection material reservoir 36 to a necessary portion by gravity. Therefore, it is possible to prevent a molding defect such that a liquid resin forming the grommet 14 is insufficient and a defective molded body in which a part of the grommet 14 is chipped is formed.

Further, if the injection port is located below, a means for closing the injection port after injection of the liquid resin, such as a stopper, is required, but in this embodiment, the injection port, that is, the excess injection material reservoir 36. However, since it is located above the upper surface of the upper mold 30, that is, above the upper end of the cavity 50, such a stopper is not required.

In this embodiment, since the upper mold 30 is provided with two injection ports, the liquid resin evenly flows into every corner of the cavity 50, and the defective molding of the grommet 14 can be prevented. Since the packing 45 tightly tightens the wire harness 12, the liquid resin is prevented from flowing down when the liquid resin is injected, and the packing 35 tightens the wire harness 12 relatively gently. The surplus amount of the liquid resin injected into the cavity 50 easily flows into the surplus material reservoir 34. Further, when the resin in the cavity 50 flows out through the wire harness 12, the function of being supplemented from the surplus material reservoir 34 is sufficiently exerted. With the various configurations and effects described above, the forming die of this embodiment can easily and economically form the defect-free grommet-integrated wire harness according to the present invention.

Molding Method Next, with reference to FIGS. 4 and 5, a molding method of the molded body 10 according to the present invention using the above-mentioned molding die will be described.
First, while the pair of half molds of the lower mold 40 are united, the lower mold 4
The wire harness 12 is passed through the lower through hole 46 of 0, the clamp 49 is tightened, and the lower mold 40 is clamped. By the mold clamping, the packing 45 tightly clamps the wire harness 12. FIG. 4A is a sectional view of the lower mold 40 showing this state. Next, the lower mold 40 holding the wire harness 12 is placed on a support base (not shown) having holes. At that time, the wire harness 12 protruding from the lower side of the lower mold 40 is passed through the hole of the support base.

Then, on the lower mold 40, the wire harness 12 is passed through the center of the grommet portion 32 while the pair of half molds of the upper mold 30 are united with each other, and the upper through hole 33 is passed through the surplus material reservoir 34. Through the clamp 39
And the upper mold 30 is clamped. By the mold clamping, the packing 35 gently tightens the corresponding portion of the wire harness 12. FIG. 4B shows the upper mold 30 showing this state.
FIG. With the above, the setting of the molding die is completed, and the cavity 50 having the same contour as the shape of the grommet 14 is formed in the center of the molding die. Then, the portion forming the head portion 18 of the grommet 14 is positioned above.

Next, the liquid resin is injected from the two excess injection material reservoirs 36 of the upper mold 30. The injected liquid resin is
Gravity naturally flows into the cavity 50 through the descending liner portion 38 and the horizontal liner portion 48. On the other hand, the air in the cavity 50 and the descending horizontal liner portions 38 and 48 flows upward through a gap in the wire harness 12. FIG. 5A is a sectional view of the molding die showing this state.

The liquid resin further fills the cavity 50 and further penetrates the through hole 33.
It flows into the surplus material reservoir 34 through the two voids. At this stage, the injection of the liquid resin is stopped. FIG. 5B is a cross-sectional view of the molding die showing a state in which the liquid resin is filled in the descending horizontal liner portions 38 and 48, the cavity 50, the excess material reservoir 34, and the excess injection material reservoir 36. Liquid resin
When entering the gap of the wire bundle of the wire harness 12 and then flowing down through the wire harness 12,
The liquid resin contained in the excess material reservoir 34 and the excess injection material reservoir 36 naturally flows down due to gravity to compensate for the shortage. After the liquid resin is cured and then at room temperature or a little warmed, the molding die is opened, the molded product is taken out, and the burrs, liners and the like are removed, whereby the molded product 10 shown in FIG. 1 can be obtained.

The means for pouring the liquid resin into the molding die does not require any special resin injecting means. For example, a predetermined amount of each of the liquid constituent raw materials is weighed and put into a container, which is stirred with a spatula or the like. Pour the degassed material in a vacuum into a mold. When a large amount of liquid resin is prepared, it is also possible to use a device generally called a casting machine.
As shown in FIG. 6, the casting machine has, for example, if there are two types of liquid resin compounding materials, raw material tanks 60 and 62 for vacuum defoaming the compounding materials and a predetermined amount of the vacuum degassed compounding material, respectively. Gear pumps 64 and 66, and a stirring tank 68 that stirs and mixes the measured blended material, and the liquid resin obtained by mixing is guided to a molding die by a hose 70 attached to the tip of the stirring tank 68. Has been done.

In the method of this embodiment, at the same time when the grommet 14 is molded in the cavity 50, the liquid resin is naturally gravity-driven from the cavity 50 to the wire due to the height difference between the surplus material reservoir 34 and the excess injection material reservoir 36. Easily enter the gap that exists between the wires in the harness. On the other hand, the packing 3 attached to the boundary between the cavity 50 and the outside
Since the wire harness 12 is tightened by the wires 5 and 45, the liquid resin does not flow out more than necessary.

In this method, all the voids generated between the electric wires of the wire harness 12 can be integrally filled with the liquid resin, and the gap into which water enters can be completely blocked by this, so that the grommet 1 which is excellent in waterproofness can be used. A body type wire harness can be realized. In this method, the head 18 of the grommet 14 and the electric wire 1 of the wire harness 12 are
Since the outer surface of 6 is in close contact with the outer surface of 6 to form a molded body which is firmly integrated and does not separate, the waterproof property does not deteriorate even after long-term use.

This method comprises a simple working process in which a molding die is set on the outer periphery of the wire harness 12, a liquid resin is poured and cured to dismantle the molding die, and a grommet-integrated wire harness is economically manufactured. it can. Also,
Since the grommet and the waterproof structure of the wire harness are simultaneously formed in one process, the overall productivity from product production to field installation is extremely high compared to the conventional method. Regardless of the specifications and shape of the wire harness 12, or even if a component such as a connector is attached to the end of the electric wire 16 of the wire harness 12, the molded body 10 integrated with the grommet 14 can be easily molded.

[0054]

As described above, according to the grommet-integrated wire harness of claim 1, the grommet is in close contact with the outer circumference of the wire harness over the entire inner circumference of the head, and the wire in the head is The wires in the wire bundle of the harness are filled with resin without any gaps. (1) When installed on the partition wall, the inside and outside are completely cut off, so the waterproof and airtightness is Greatly superior to grommets. (2) Regardless of the type of work wiring, since the liquid resin and the wire harness are excellently compatible, the grommet and the wire harness are firmly integrated so that they do not separate, and the grommet integrated type has excellent waterproofness. Realize a wire harness. (3) The work of inserting the wire harness into the grommet and the work of sealing with the liquid resin at the site are not required, so that the work efficiency at the site is significantly improved.

In the grommet-integrated wire harness according to the fourth aspect, since the resin contains a thermosetting polyurethane resin as a main component and contains a plasticizer for vinyl chloride, the wire harness is coated with vinyl chloride. Since the transfer of the plasticizer to the grommet thermosetting polyurethane resin is suppressed, the stability and electric insulation of the wire harness can be favorably maintained for a long period of time.

In the grommet-integrated wire harness according to claim 5, wherein the positions of the head of the grommet and the engaging portion are separated from each other in the direction of the center line of the grommet, the engaging portion is formed by molding with the head facing upward. It is possible to prevent the flowing material from flowing out, and thus to prevent defective molding of the engaging portion.

According to the molding die of the sixth aspect, with the configuration described above, it is possible to minimize the liquid resin flowing through the wire harness to the outside when the liquid resin is injected.

According to the molding die of the seventh aspect, by providing the excess material reservoir, even if a part of the liquid resin flows down through the electric wire of the wire harness after the liquid resin is injected, the liquid resin flows down. Naturally re-flows from the excess material reservoir by gravity. Therefore, it is possible to prevent a molding defect such that a liquid resin forming the grommet is insufficient and a defective molded body in which a part of the grommet is chipped is formed.

According to the molding method of the eighth aspect, the grommet-integrated wire harness according to the present invention can be molded easily and with high productivity without defects.
In addition, the grommet-integrated wire harness can be easily molded regardless of the specifications and shape of the wire harness, or even if a connector or the like is attached to the wire end portion of the wire harness.

According to the molding method of the ninth aspect, by molding with the head side of the grommet facing upward, resin outflow during molding can be suppressed to a minimum and molding defects can be prevented.

[Brief description of drawings]

1 (a) is a side view of an embodiment of a grommet-integrated wire harness according to the present invention, and FIG. 1 (b) is FIG.
1A is a cross-sectional view taken along the line XX in FIG.
It is sectional drawing in the surface which passes along the centerline of the grommet integrated wire harness of (a).

2A is a sectional view of an upper die, FIG. 2B is a sectional view of a lower die, and FIG. 2C is a perspective view of a forming die.

FIG. 3 is a cross-sectional view showing a cavity of a molding die.

FIG. 4 (a) and FIG. 4 (b) are cross-sectional views of the forming mold showing the steps of setting the forming mold.

5 (a) and 5 (b) are cross-sectional views of a molding die showing a step of injecting a liquid resin into the molding die.

FIG. 6 is a block diagram of a casting machine for preparing a liquid resin.

7 (a) is a sectional view of a conventional grommet, FIG.
7B is a cross-sectional view in which the wire harness is passed through the grommet of FIG. 7A and the grommet is attached to the partition wall.

FIG. 8 is a cross-sectional view showing a state where a wire harness is penetrated through a partition wall by using another conventional grommet.

9 (a) and 9 (b) are cross-sectional views showing a state in which a wire harness is penetrated through a partition wall using still another conventional grommet.

[Explanation of symbols]

10 Example of grommet integrated wire harness, molded body 12 Wire harness 14 Grommet 16 Electric wire 18 Head part 18A Head part outer peripheral part 18B Head part 20 Skirt part 22 Engaging part 30 Upper mold 31 Upper contour wall 32 Grommet Part 33 Upper through hole 34 Excess material reservoir 35 Packing 36 Overfilled material reservoir 37 Hinge connection 38 Down liner part 39 Clamp 40 Lower mold 41 Lower contour wall 42 Recess 44 Convex part 45 Packing 46 Lower through hole 47 Hinge connection 48 Horizontal Liner 49 Clamp 50 Cavity

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Claims (9)

[Claims] 1. A wire harness comprising a bundle of electric wires (1
2) and a grommet (14) for holding the wire bundle of this wire harness (12) in a state where the hole of the partition wall is penetrated.
The grommet (14) includes a head portion (18) and an engaging portion (22) that engages with the partition wall, and the head portion (18) of the grommet (14). ) Is an outer peripheral portion (18A) surrounding the outer periphery of the wire harness (12),
It is formed of a central portion (18B) that fills the gap between the electric wires (16) of the wire bundle of the wire harness, and these outer peripheral portion (18A) and central portion (18B) are integrally formed of the same material. The grommet integrated wire harness that is characterized by 2. The grommet-integrated wire harness according to claim 1, wherein the material is a material obtained by curing a liquid resin. 3. The grommet-integrated wire harness according to claim 1, wherein the material is polyurethane resin. 4. The electric wire (16) of the wire harness (12) is coated with vinyl chloride resin, and the resin forming the grommet (14) contains a thermosetting polyurethane resin as a main component and vinyl chloride. The grommet-integrated wire harness according to claim 1, further comprising a plasticizer for resin. 5. The head (18) of the grommet (14)
The grommet integrated wire harness according to claim 1 or 4, wherein the engaging portion (22) and the engaging portion (22) are provided at positions separated from each other in the direction of the center line of the grommet (14). 6. A mold comprising an upper mold (30) and a lower mold (40) which cooperate to form a cavity (50) for integrally molding a grommet with a wire harness, the cavity (50) ) Is a grommet part (32) having the same contour as that of the grommet (14) and an upper through hole (33) extending above the grommet part (32) and a lower part for penetrating the wire harness (12). And a lower through hole (46) extending to the inner surface of the lower through hole (46), the inner surface of which is in close contact with the wire harness (12). Mold for harness. 7. The forming die for a grommet-integrated wire harness according to claim 6, wherein the upper through hole (33).
A forming mold for a grommet-integrated wire harness, characterized in that a surplus material reservoir (34) having a diameter increased further is provided. 8. A step of setting a wire harness (12) in the molding die according to claim 6 or 7, and clamping the mold, and a cavity (50) for liquid resin through a resin injection port (36) of the upper die. ) Into the grommet part (32),
The grommet (14) is in close contact with the outer circumference of the wire harness over the entire inner circumference at its head (18), and the electric wires (16) of the wire bundle of the wire harness in the head are mutually
A method of manufacturing a grommet-integrated wire harness, comprising: a step of filling the liquid resin with no gaps. 9. The grommet (14) is formed so that the head (18) side faces up.
A method for manufacturing the grommet-integrated wire harness described.