JPH1189053A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which can surely prevent both leakage of water through a clearance between electrical wires or/and between electrical wire and the grommet within the side of grommet and the leakage of water from a bonding area between the grommet and a glass surface. SOLUTION: This grommet 100 is formed integrally with a wire w distributed through insertion into a through-hole 50 formed to a glass panel 50 and is then placed on the glass panel 50 so as to close a through-hole 50A. In this case, styrene-based elastomer having superior wire covering property is used for the surface of a wire w, while a PVC elastomer having superior bonding property for glass is used for the area in contact with the glass panel 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a case where one or a plurality of electric wires are inserted into a through hole formed in a bag door glass panel of an automobile for wiring, and the like, and is integrally formed with the electric wires to be wired. Regarding a grommet installed on a glass panel so as to close a hole, it is intended to simultaneously improve water stoppage between a through hole and an outer periphery of a grommet and water stoppage between electric wires inside a grommet or / and between an electric wire and an inner peripheral surface of a grommet. .

[0002]

2. Description of the Related Art For example, a back door glass panel (hereinafter, also simply referred to as a back door glass) opens and closes.
In a so-called glass hatch type automobile, it is necessary to form a through-hole directly in the back door glass to supply electric power to the rear wiper and the heat wire, and to route the power through the through-hole. In some cases, a single wire may be used, or a plurality of wires may be used as a wire bundle.

[0003] In this case, conventionally, a fixed length portion including an insertion point of an electric wire (an electric wire bundle) to be inserted into the through hole is arranged in a mold, and the electric wire is formed by injection molding into a P material which is a molding material.
A grommet is formed integrally with the VC elastomer or the styrene-based elastomer to form a grommet. For example, as shown in FIG. 7, an annular protrusion formed around a wire outlet opening 60A of the grommet 60 in a through hole 50A of the back door glass 50. 6, the back door glass 50 and the grommet 60 are adhered to each other through the polyurethane adhesive 70 from the periphery of the projection 6 to the contact portion between the grommet 60 and the back door glass 50, and penetrated from outside (X). Water is prevented from entering the inside of the vehicle (Y) through the hole 50A. In addition, usually, the adhesion part of the grommet 60 and the glass panel 50 has been subjected to a primer treatment on the adhesion surface in order to enhance the adhesion.

[0004]

However, the above-mentioned conventional grommet does not have sufficient water stopping properties. That is,
When a PVC elastomer is used as a molding material, the adhesiveness with glass is not good because the fluidity in the mold during the molding process is poor, so that the covering property of the electric wire is not good. In particular, when the number of electric wires becomes three or more, All the wires cannot be completely covered by filling the gap between the wires, and water enters the vehicle compartment (Y) from the outside (X) through the gap between the wires or / and the gap between the wires and the grommet. However, there is a drawback that there is a case where water enters.

When a styrenic elastomer is used as a molding material, the fluidity in the mold during the molding process is good, and the covering properties of the wire are excellent. However, since the adhesiveness to glass is poor, the grommet is poor. A gap is formed in the bonding area between the outer peripheral surface and the glass surface, and there is a disadvantage that water may enter the inside of the vehicle (Y) from the outside (X) through the gap.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and ensures that water is immersed in the grommet from between electric wires or / and a gap between the electric wire and the grommet and from the bonding area between the grommet and the glass surface. An object of the present invention is to provide a grommet that can be prevented.

[0007]

In order to solve the above-mentioned problems, according to the present invention, an electric wire to be routed through a through-hole formed in a glass panel of an automobile is formed by molding. A grommet made of an elastomer that is fixedly attached to the through-hole and adheres to the glass panel, wherein a first molding layer that is in contact with the electric wire is formed of a first molding material having good adhesion to an insulating coating of the electric wire. In addition, there is provided a grommet characterized in that the second molding layer to be adhered to the glass panel is molded from a second molding material having good adhesion to glass.

As the first molding material, a styrene-based elastomer showing good fluidity when melted in a mold is used. As the second molding material, for example, a glass-based material such as a polyurethane-based adhesive is used. It is preferable to use a PVC-based elastomer which has good compatibility with the adhesive and which firmly adheres to the glass (claim 2). Note that an elastomer other than a styrene-based elastomer may be used as the first molding material as long as it has fluidity that penetrates into the gap between the electric wires when melted in the mold. An elastomer other than a PVC-based elastomer may be used as the second molding material as long as it has good compatibility with the glass adhesive and firmly adheres to glass.

With the above construction, it is possible to prevent a gap from being formed between the electric wires inside the grommet and / or between the electric wire and the grommet, and also to prevent a gap from being formed between the outer peripheral surface of the grommet and the bonding area of the glass panel. In addition, it is possible to reliably prevent water from entering the inside of the vehicle from the outside through the through hole formed in the glass panel.

The grommet is formed into a laminated structure by laminating a first molding layer made of the first molding material and a second molding layer made of the second molding material by multilayer molding, and the first and second molding layers are formed. When anchor-like projections are formed on the bonding surface of at least one of the layers at the bonding portion of (1) to increase the bonding force between the two layers (claim 3), a more reliable water stopping structure is obtained. be able to.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the grommet of the first embodiment. The grommet 100 is made by molding a molding material into a wire bundle w by injection molding in the same manner as in the prior art. Is formed so as to enclose a predetermined length of the bent portion 1 and the linear portion 2 running in the horizontal direction from the bent portion 1, and the bent portion 1 of the wire bundle w is formed.
The tip portion from which the linear portion 3 running in the vertical direction extends from the disk is shaped like a disk, the entire lower surface 4 is made substantially flat, and an annular protrusion is formed around the wire outlet 5A on the lower surface of the disk-shaped portion 5. 6 is provided. Here, the lower layer 10 having a constant thickness including the lower surface 4 serving as an adhesive surface to the glass panel is formed of PVC elastomer, and the upper layer 20 around the wire bundle w is formed of styrene-based elastomer.

The grommet 100 was manufactured using the following multilayer molding technique. First, as shown in FIG. 3A, a concave portion 31 corresponding to the outer shape of the lower layer portion 10 of the grommet 100.
And a first upper mold 40 having a through-hole 40A through which the wire bundle w is passed, and a PVC elastomer is injection-molded to form the lower layer portion 10 of the grommet.
Specifically, the concave portion 31 of the lower mold 30 has a two-step bottom surface,
A through hole 33 is formed from the bottom surface 32 of the bottom portion 31A corresponding to the annular protrusion 6 provided on the lower surface 4 of the grommet toward the lower surface 30A of the mold, and passes through the through hole 40A of the first upper mold 40. The bundled electric wire bundle w is further passed through the lower mold 30 through hole 33.
And the mold was clamped in this state to injection-mold a PVC elastomer. The nozzle temperature was set to 180 ° C., the injection pressure was set to 20 kgf / cm ² , and the injection time was set to 20 sec.
C elastomer was injected, the mold temperature was set to 20 ° C., and the cooling time was molded in 40 seconds. By this injection molding, the wire bundle w was fixed at a contact portion with the lower layer portion 10 of the grommet made of PVC elastomer.

Next, after the mold is opened and the first upper mold 40 is removed from the wire bundle w by removing it, a concave portion 43 corresponding to the outer shape of the upper layer portion 20 of the grommet 100 is provided.
A second upper mold 42 having a through hole 44 for inserting a wire bundle w is prepared from the inner side surface 43A of the concave portion 43 to the side surface 42A of the mold, as shown in FIG. , Lower layer 1
The wire bundle w on the upper side of the second upper mold 42
After being led out of the mold through the through hole 44 from the inside of the concave portion 43, the upper layer portion 20 was formed by clamping the mold and injection-molding a styrene-based elastomer. The nozzle temperature was set to 195
° C, an injection pressure of 20 kgf / cm ² , and an injection time of 20 kgf / cm ^2.
Inject styrene elastomer in 2 sec.
The molding was performed at 0 ° C. and the cooling time was 40 seconds. By this injection molding, the outer peripheral surface of each wire of the wire bundle w which has been horizontally laid down above the lower layer portion 10 of the wire bundle w is covered with a styrene-based elastomer, and the gap between the wires is an upper layer portion of a grommet made of the styrene-based elastomer. It was completely filled with twenty.

Thereafter, the mold was opened, the second upper mold 42 and the lower mold 30 were removed, and the grommet 100 was taken out. The second upper mold 42 and the lower mold 30 are configured so that they can be divided into two in the left and right around the wire bundle insertion portion in advance.

As shown in FIG. 5, a body-side grommet 200 is mounted on the side of the wire bundle w in which the grommet 100 is formed integrally with the wire bundle w at a predetermined portion, as shown in FIG. Then, the body-side grommet 200 is fitted and attached to a through hole formed in the vehicle body panel of the vehicle body, and the electric wire bundle w is routed inside the vehicle body.

On the other hand, the side on which the wire bundle w is routed on the back door glass 50 is the grommet 100 and the back door glass 5.
After performing the primer treatment on the through-hole 50A of the back door glass 50, as shown in FIG.
An annular protrusion 6 formed around the wire lead-out opening 5 </ b> A of the grommet 100 is fitted into the grommet 100, and the lower surface 4 of the grommet 100 and the back door glass 5 from around the protrusion 6.
The adhesive is applied to the back door glass 50 with the adhesive 70 interposed over the entire contact area on the surface of the zero. At this time, since the lower layer portion 10 of the grommet 100 is formed of a PVC-based elastomer having good compatibility with the polyurethane-based adhesive which is an adhesive for glass, a gap is formed between the grommet 100 and the adhesive layer. Thus, the back door glass 50 is firmly bonded. Therefore, inside the grommet 100, as described above, the outer peripheral surface of each electric wire of the electric wire bundle w is covered with the styrene-based elastomer so that no gap is formed between the electric wires. Therefore, it is possible to reliably prevent water from entering the vehicle interior from the outside through the through hole 50A of the back door glass 50.

FIG. 6 shows a grommet according to a second embodiment.
The grommet 100A has anchor-like projections 10A formed at regular intervals on the upper surface of a lower layer 10 formed of a PVC elastomer on the side to be bonded to a glass panel, and a bonding force with an upper layer 20 formed of a styrene elastomer. And eliminates the danger that a gap may be formed at the boundary between the lower layer portion 10 and the upper layer portion 20 to provide a more reliable water stopping structure.

In the above-described embodiment, the case where the wire bundle is inserted and routed through the through hole formed in the back door glass has been described. However, the present invention provides the case where the through hole is formed in the glass panel at another place of the automobile. It is needless to say that the present invention can be applied to a case where the wire bundle is formed and the electric wire bundle is inserted into the through hole for wiring.

[0019]

As is apparent from the above description, according to the present invention, the glass is molded together with the insertion part of the electric wire to be inserted and routed through the through hole formed in the glass panel, and the glass is formed so as to close the through hole. A grommet to be adhered on the panel is formed using a first molding material having excellent wire covering properties around the electric wires, and a second molding material having excellent adhesion to glass is used at a contact portion with the glass panel. By doing so, it is possible to prevent a gap from being formed between the electric wires inside the grommet or / and between the electric wire and the grommet, and to prevent a gap from being formed between the outer peripheral surface of the grommet and the bonding area of the glass panel. Therefore, it is possible to reliably prevent water from entering the vehicle from the outside through the through holes formed in the glass panel.

In particular, the grommet is formed into a laminated structure by laminating a first molding layer made of the first molding material and a second molding layer made of the second molding material by multilayer molding, and the first and second molding layers are formed. An anchor-like projection is formed on the bonding surface of at least one of the layers at the bonding portion of the above to form a structure in which the bonding force between the two layers is increased, so that a more reliable water stopping structure can be obtained. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a grommet according to a first embodiment.

FIG. 2 is a sectional view showing the grommet of the first embodiment.

FIGS. 3A and 3B are cross-sectional views showing a manufacturing process of the grommet shown in FIGS.

FIG. 4 is a cross-sectional view showing a state where the grommet shown in FIGS. 1 and 2 is bonded to a back door glass.

5 is a plan view showing a state in which a body-side grommet is attached to the body side of the wire bundle in which the grommet shown in FIGS. 1 and 2 is integrally formed.

FIG. 6 is a cross-sectional view illustrating a grommet according to a second embodiment.

FIG. 7 is a cross-sectional view showing a state where a conventional grommet is bonded to a back door glass.

[Explanation of symbols]

 w Wire bundle 1 Bent portion of wire bundle 2, 3 Linear portion of wire bundle 4 Lower surface of grommet 5 Disk-shaped portion 5A Wire lead-out opening 6 Annular protrusion 10 Lower portion of grommet 20 Upper portion of grommet 50 Back door glass 50A Through-hole 70 adhesive

Claims (3)

[Claims] 1. A grommet made of an elastomer, wherein an electric wire to be inserted and routed through a through hole formed in a glass panel of an automobile is molded, locked and attached to the through hole, and adhered onto the glass panel. A first molding layer that is in contact with the electric wire is formed of a first molding material having good adhesiveness with an insulating coating of the electric wire, and a second molding layer that is adhered to the glass panel is a second molding layer having good adhesion to glass.
A grommet characterized by being formed from a molding material. 2. The grommet according to claim 1, wherein the first molding material is a styrene elastomer, and the second molding material is a PVC elastomer. 3. A multilayer structure in which a first molding layer made of the first molding material and a second molding layer made of the second molding material are laminated by multilayer molding, and the first and second molding layers are joined. The grommet according to claim 1 or 2, wherein an anchor-like projection is formed on a bonding surface of at least one of the layers to increase a bonding force between the two layers.