JPH08186920A - Grommet - Google Patents

Abstract

PURPOSE: To improve the coupling operability of divided parts and to simply and effectively prevent the invasion of rain water, etc., from the coupled part. CONSTITUTION: A grommet comprises soft grommet segments 7 (7-I, 7-II) formed with through holes 7d for passing a wire harness W/H and axially divided at a predetermined position in such a manner that the outer periphery of the end 7e of the other segment 7-II is inserted to be coupled to the inner periphery of the through hole 7d of the split end 7e of the one segment 7-I, wherein the inserted part A and the taped part B of the split end 7e of the other segment 7-II is formed harder than the other part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet in which an electric wire insertion portion is divided, and more specifically, it improves connection workability of the divided portion and prevents rainwater and the like from entering the connection portion easily and surely. It enables you to do it.

[0002]

2. Description of the Related Art Generally, a wire harness penetrated through a through hole of a vehicle body panel of an automobile has a soft rubber grommet attached to the through hole of the vehicle body panel for waterproofing and protection of the wire harness. ing.

As a kind of the above-mentioned grommet, FIG. 4 (A)
As shown in (B), a through hole 1a of the panel 1 such as an automobile side door, a hatchback door, and a trunk lid,
Grommet 3 to be attached to the wire harness W / H penetrating through the through hole 2a of the panel 2 in the vehicle interior
There is.

The grommet 3 shown in FIG. 4A has a large-diameter vehicle body mounting portion 3a which is mounted in the through hole 1a of the panel 1 such as a side door, and a large diameter vehicle body mounting portion which is mounted in the through hole 2a of the panel 2 inside the vehicle compartment. Part 3b and both large-diameter vehicle body mounting parts 3a, 3
It is composed of a small diameter tubular electric wire insertion portion 3c connecting b, and the length L1 of the electric wire insertion portion 3c is set long for the movable side door and the like. In addition, the grommet 3 shown in FIG. 4 (B) has a bellows portion provided on the small-diameter wire insertion portion 3c, and the length L2 thereof is the grommet 3 of FIG. 4 (A).
Some are about twice as long.

In each of the grommets 3, the wire insertion portion 3c is bent at a right angle, and the lengths L1 and L2 are set.
Since it is long, it is very difficult to integrally mold it with a molding die. Further, if the wire insertion portion 3c is long, it is difficult to carry out the wire passing work for penetrating the wires a, ... Of the wire harness W / H. Further, as shown in FIG. 4A, when it is necessary to branch the electric wire b from the wire harness to be inserted into the electric wire insertion portion 3c and connect it to the power source, the electric wire insertion portion 3c
It is necessary to take out the more branched electric wire c.

For the above reason, as shown in FIG. 5 (A), the electric wire insertion portion 3c of the grommet 3 is divided into two parts at a predetermined axial position, and one of the divided grommet 3-I is mounted on the vehicle body mounting part 3a. The wires a, ... Are pierced through the through holes 3d of the wire insertion portion 3c one by one, and then the other split grommet 3-.
Each of the electric wires a, ... Is pierced from the electric wire insertion portion 3c of II into the through hole 3d of the vehicle body mounting portion 3b, and then the through hole 3d of the end portion 3e of the electric wire insertion portion 3c of the split grommet 3-I. On the inner peripheral surface, the end portion 3 of the small diameter portion 3c of the split grommet 3-II.
Insert the outer peripheral surface of e to connect it, and then split the grommet 3-
A split type grommet 3 that integrates I and 3-II is provided.

The split grommets 3-I and 3-II are bent into the panels 1 and 2 by bending the vehicle body mounting portions 3a and 3b, respectively.
Since it is necessary to attach to the through holes 1a and 2a, the whole is molded with soft rubber or elastomer.

For this reason, as shown in FIG. 5 (B), the adhesive tape 4a straddles the outer peripheral surface of the end 3e of the wire insertion portion 3c of the split grommet 3-II and the wire harness W / H.
When winding and fixing the wire harness W / H,
Since the inner diameter of the through hole 3d of the wire insertion portion 3c is set to be larger than the outer diameter of the wire harness W / H for the wiring workability of the wire harness W / H, the adhesive tape 4a
The end portion 3e of the small diameter portion 3c is deformed inward by the winding force of, and wrinkles e are generated.

Therefore, in this state, the outer peripheral surface of the end portion 3e of the small diameter portion 3c of the split grommet 3-II becomes the inner peripheral surface of the through hole 3d of the end portion 3e of the wire insertion portion 3c of the split grommet 3-I. When inserted and connected (see FIG. 5 (E)), the outer peripheral surface of the end 3e of the wire insertion portion 3c of the split grommet 3-II and the end 3 of the wire insertion portion 3c of the split grommet 3-I.
Even if both the divided grommets 3-I and 3-II are integrally fixed by winding the adhesive tape 4c over the outer peripheral surface of e, rainwater and the like enter the inside of the grommet 3 from the wrinkle e. It is inevitable.

Therefore, as shown in FIG. 5C, a hard rubber or synthetic resin is formed on the outer periphery of the wire harness W / H near the end 3e of the wire insertion portion 3c of the split grommet 3-II. Wrap the ring 5 and the adhesive tape 4b around the circumference.
After winding and fixing, and fitting the ring 5 to the inner peripheral surface of the through hole 3d of the end portion 3e, as shown in FIG. 5D, the outer peripheral surface of the end portion 3e and the wire harness W. / H is wrapped around the adhesive tape 4a to fix the wire harness W / H.

After that, as shown in FIGS.
The end 3e of the wire insertion portion 3c of the split grommet 3-I
The outer peripheral surface of the end portion 3e of the electric wire insertion portion 3c of the split grommet 3-II is inserted and connected to the inner peripheral surface of the through hole 3d of the divided grommet 3-II. And the end 3e of the wire insertion portion 3c of the split grommet 3-I
Wrap the adhesive tape 4c over the outer peripheral surface of
Both split grommets 3-I and 3-II are fixed together.

Each wire a of the wire harness W / H,
Among them, the branch electric wire b utilizes the bending of the end portion 3e of the split grommet 3-I, and between the outer peripheral surface of the end portion 3e and the outer peripheral surface of the end portion 3e of the split grommet 3-II. It is led out to the outside and the connector c is attached to the tip (Fig. 4).
(A)).

[0013]

However, since the outer diameter of the wire harness W / H penetrating the inside of the grommet 3 changes variously according to the specifications, the ring 5 is used.
Is very difficult to wind so as to fit the inner peripheral surface of the through hole 3d of the split grommet 3-II so that there is no gap, and there is a gap between the through hole 3d and the adhesive tape 4a.
If a wrinkle e is generated at the end 3e of the wire insertion portion 3c due to the winding force of, and rainwater or the like enters the inside of the grommet 3 from the wrinkle e, it causes an electrical trouble. Also,
Due to the number of man-hours required to wind the ring 5 and the adhesive tape 4b, workability is deteriorated and cost is increased.

The present invention has been made to solve the above problems, and provides a grommet that improves the workability of connecting divided parts and can easily and reliably prevent rainwater and the like from entering from the connecting part. That is the purpose.

[0015]

In order to achieve the above object, the present invention provides a flexible body in which a large-diameter vehicle body mounting portion for penetrating a wire harness and a small-diameter electric wire insertion portion are formed by continuous electric wire through holes. Grommet is divided at a predetermined position of the wire insertion portion, the inner peripheral surface of the through hole of the split end of one wire insertion portion, the outer peripheral surface of the split end of the other wire insertion portion is inserted and connected, A grommet for taping a connecting portion to fix it, wherein at least the inserting portion and the taping portion of the split end portion of the other electric wire inserting portion are formed to be harder than other portions. It provides a harness.

The grommet has a vehicle body mounting portion provided at each of the other ends of the divided wire insertion portions, and has a structure in which the divided wire insertion portions are connected to each other and the vehicle body mounting portions are provided at both ends. Item 2).

[0017]

In the present invention, the electric wire insertion portion of the soft grommet is divided at a predetermined position in the axial direction, and the outer peripheral surface is inserted and connected to the inner peripheral surface of the through hole at the end of one electric wire insertion portion. The insertion portion and the taping portion at the end of the wire insertion portion are formed to be harder than other portions. As a method of forming a hard grommet, when the grommet is made of rubber, two layers are formed on the part to be hard formed using a rubber having a hardness higher than the hardness of other parts. Further, when the grommet is made of a plastic elastomer, the tip portion of the wire insertion portion formed to be rigid is made into a resin, and the plastic elastomer and the polymer molecule are bonded and integrated.

As described above, by forming the insertion portion and the taping portion at the end portion of the other wire insertion portion to be rigid, the adhesive tape is wound over the outer peripheral surface of the end portion of the wire insertion portion and the wire harness. Then, when the wire harness is fixed, since the insertion portion and the tape portion are hard, the end portion is not deformed inward by the winding force of the adhesive tape, and wrinkles do not occur. Therefore, unlike the prior art, the work of winding a hard rubber or synthetic resin ring around the outer circumference of the wire harness and winding the adhesive tape around the outer circumference to fix the wire harness becomes unnecessary, improving the workability of connection and reducing the cost. Can be down. Moreover, since wrinkles do not occur in the insertion portion and the taping portion at the end of the other electric wire insertion portion, there is no possibility that rainwater or the like will enter the inside of the grommet, and electrical troubles can be reliably prevented.

[0019]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. It should be noted that parts having the same configurations and functions as those of the prior art shown in FIG. As shown in FIGS. 1 and 2, a grommet 7 made of rubber or plastic elastomer has a large-diameter vehicle body mounting portion 7a to be mounted in a through hole 1a of a panel 1 such as an automobile side door,
It is formed by a large-diameter vehicle body mounting portion 7b that is attached to the through hole 2a of the panel 2 in the vehicle interior and a small-diameter electric wire insertion portion 7c that connects both large diameter vehicle body mounting portions 7a and 7b, and is tubular as a whole. I have a body.

The electric wire insertion portion 7c of the grommet 7 is divided into two at a predetermined position in the axial direction, and one divided grommet 7-
The outer peripheral surface of the end portion 7e of the electric wire insertion portion 7c of the other split grommet 7-II is inserted and connected to the inner peripheral surface of the through hole 7d of the end portion 7e of the electric wire insertion portion 7c of I.

On the outer peripheral surface of the wire insertion portion 7c of the other split grommet 7-II, the one split grommet 7- is formed.
Hold the end face of the end portion 7e of the wire insertion portion 7c of I,
A flange portion 7f that regulates the insertion position is formed, and in the flange portion 7f, an electric wire b of each of the electric wires a, ... Of the wire harness W / H, which is led out to the outside from the connecting portion and to which the connector c is attached at the tip. A notch 7g for passing through is formed (see FIG. 3 (A)).

Of the end portion 7e of the wire insertion portion 7c of the other split grommet 7-II, the portion indicated by A in FIG. 2B is the end portion of the wire insertion portion 7c of the one split grommet 7-I. 7e is the insertion portion A, and the portion indicated by B is the outer peripheral surface of the end portion 7e of the small diameter portion 7c of the other split grommet 7-II and the end portion 7e of the wire insertion portion 7c of the one split grommet 7-I. It is a taping portion B on which the adhesive tape 4b is wound so as to straddle the outer peripheral surface of the tape.

The above-mentioned divided grommets 7-I and 7-II are
The vehicle body mounting portions 7a and 7b are connected to the through holes 1a of the panels 1 and
In order to bend and attach to 1b, each wire insertion part 7c
Basically, it is made of soft rubber or plastic elastomer because it requires some bending.

Therefore, if the wrinkle e is generated due to the inward deformation due to the deflection, only a problematic portion, that is, the end portion 7e of the wire insertion portion 7c of the other split grommet 7-II is generated.
Only the insertion part A and the taping part B are formed harder than the other parts.

Specifically, when the divided grommets 7-II are made of rubber, the portions A and B which are formed to be hard have a hardness (for example, 7 degrees) higher than the hardness of other portions (usually 50 degrees).
Two layers are formed by using rubber of 0 to 80 degrees. When the split grommet 7-II is made of a plastic elastomer, the hard-formed portions A and B are made into a resin, and the plastic elastomer and the polymer molecules are bonded and integrated.

If the grommet 7 is constructed as described above,
As shown in FIG. 3 (A), one split grommet 7-I
From the vehicle body mounting portion 7a to the through hole 7d of the electric wire insertion portion 7c, each of the electric wires a, ... Is penetrated one by one, and then from the electric wire insertion portion 7c of the other split grommet 7-II to the through hole 7d of the vehicle body mounting portion 7b. After each of the electric wires a, ... Is pierced through one by one, as shown in FIG. 3B, the outer peripheral surface of the insertion portion A of the end portion 7e of the electric wire insertion portion 7c of the other split grommet 7-II and the wire harness. The adhesive tape 4a is wound over the W / H to fix the wire harness W / H. At this time, since the insertion portion A of the other split grommet 7-II is hard, the end portion 7e of the wire insertion portion 7c is not deformed inward by the winding force of the adhesive tape 4a, and wrinkles e do not occur. .

Thereafter, while the electric wire b of the wire harness W / H is led out to the outside, the other divided grommet is attached to the inner peripheral surface of the through hole 7d of the end 7e of the electric wire insertion portion 7c of the one divided grommet 7-I. End portion 7e of wire insertion portion 7c of 7-II
Insert the outer peripheral surface of and connect.

Then, the adhesive tape 4c is wound over the outer peripheral surface of the end portion 7e of the wire insertion portion 7c of the split grommet 7-I and the outer peripheral surface of the end portion 7e of the wire insertion portion 7c of the split grommet 7-II. , Both split grommets 7-I, 7-I
Fix I integrally. At this time, since the taping portion B of the end portion 7e of the wire insertion portion 7c of the other split grommet 7-II is hard, the end portion 7e of the small diameter portion 7c is not deformed inward by the winding force of the adhesive tape 4c. The wrinkle e does not occur in this portion B, either.

Therefore, the other split grommet 7-II
Since wrinkles e do not occur at the insertion portion A and the taping portion B of the end portion 7e of the electric wire insertion portion 7c, there is no possibility that rainwater or the like will enter the inside of the grommet 7, and electrical troubles caused by the entry of rainwater or the like will be avoided. It can be surely prevented.

Further, the wire harness W /
Since the work of winding a ring 5 made of hard rubber or synthetic resin around the outer periphery of H and winding and fixing the adhesive tape 4 around the outer periphery is unnecessary, the split grommet 7-I,
The 7-II connection workability is improved, and the cost can be reduced.

In the above embodiment, the wire insertion portion 7c of the grommet 7 is divided into two, but the same connecting structure can be adopted even if the electric wire insertion portion 7c is divided into three or more. Further, in the above-described embodiment, the wire insertion portion 7c is bent at a right angle, but it may be straight.
Further, a straight tube-shaped grommet without the vehicle body mounting portions 7a and 7b may be used.

[0032]

As is apparent from the above description, according to the present invention, the electric wire insertion portion of the grommet formed of the soft cylindrical body is divided at a predetermined axial position, and the divided end portion of one electric wire insertion portion is divided. Since the insertion part and taping part of the split end of the other wire insertion part that inserts and connects the outer peripheral surface to the inner peripheral surface of the through hole are formed harder than other parts, When the adhesive tape is wound over the outer peripheral surface of the wire harness and the wire harness is fixed, since the insertion portion and the tape portion are hard, the end portion is not deformed inward by the winding force of the adhesive tape,
Wrinkles do not occur.

Therefore, unlike the prior art, the work of winding a hard rubber or synthetic resin ring around the outer periphery of the wire harness and wrapping and fixing the adhesive tape around the outer periphery is not necessary, and the connecting workability is improved. The cost can be reduced. Further, since wrinkles do not occur in the insertion portion and the taping portion at the end of the other wire insertion portion, there is no possibility that rainwater or the like will enter the inside of the grommet, and electrical troubles can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a side view of a grommet of the present invention.

FIG. 2A is a side view of the wire insertion portion after connection,
(B) is a sectional view of (A).

FIG. 3A is a perspective view of a wire insertion portion before connection,
(B) is a perspective view of the small diameter part which wound the adhesive tape over the wire harness.

4A and 4B are side views of a conventional grommet, respectively.

FIG. 5A is a cross-sectional view of a conventional two-divided grommet,
(B) is a perspective view of an electric wire insertion part in which an adhesive tape is wound over a wire harness, (C) is a perspective view of a wire harness in which a ring is wound, (D) is a perspective view of an electric wire insertion part after connection, ( E) is a sectional view of (D).

[Explanation of symbols]

 7 Grommet 7-I, 7-II Split grommet 7a, 7b Car body mounting part 7c Electric wire insertion part 7d Through hole 7e End part A insertion part B Taping part W / H wire harness

Claims (2)

[Claims] 1. A soft grommet formed by connecting a large-diameter vehicle body mounting portion through which a wire harness penetrates and a small-diameter electric wire insertion portion with continuous electric wire through holes is divided at a predetermined position of the electric wire insertion portion, and one electric wire is formed. A grommet for inserting and connecting the outer peripheral surface of the split end portion of the other wire insertion portion to the inner peripheral surface of the through hole of the split end portion of the insertion portion, and taping the connection portion to fix the same. The grommet, wherein the insertion portion and the taping portion of the divided end portion of the electric wire insertion portion are formed to be harder than other portions. 2. The grommet according to claim 1, wherein a vehicle body mounting portion is provided at each of the other ends of the divided electric wire insertion portions, and the divided electric wire insertion portions are connected to each other and the vehicle body mounting portions are provided at both ends. .