JPH07245029A - Grommet - Google Patents

Abstract

PURPOSE:To provide a grommet for which a filling agent pouring work is carried out easily with lessened amount of the agent to be poured and whose installation condition in a diaphragm can be stabilized. CONSTITUTION:A grommet is one to be installed while a wire harness W being inserted into a through hole 10a in a diaphragm 10 in water-proofing condition and the grommet is composed of an outer member 11 and an inner member 12. A joining groove 11c to be joined to the circumferential edge of the through hole 10a is formed in the outer circumferential face of the outer member 11. The inner member 12 is a cylinder to be inserted into the inside of the outer member 11. Both are made of elastic materials and the inner diameter of the outer member 11 is equal to or smaller than the outer diameter of the inner member 12. The inside of the inner member 11 is previously filled with a filling agent 13 and the agent is hardened while a wire harness W being inserted into and the inner member 12 into which the wire harness W is inserted in water-proofing condition is inserted into the outer member 11 by pressure and fixed in the outer member 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is attached by inserting a wire harness in a water-tight state into a through hole of a partition plate which separates a vehicle interior side and an exterior of the vehicle. It is possible to facilitate the filling operation of the filler to be injected and to arbitrarily change the step of inserting the wire harness into the grommet and the step of injecting the filler.

[0002]

2. Description of the Related Art In an automobile, a wire harness that is wired from the outside of an engine room or the like to the inside of a vehicle is apt to be exposed to water outside the vehicle, and water may be flooded inside the wiring harness. When the water infiltrated into the wire harness is generated in the vehicle cabin when the vehicle is running, and if the negative pressure or the indoor route is low, it is transmitted to the vehicle cabin side through the inside of the wire harness due to the height difference, and is connected to the vehicle cabin side. This causes corrosion on the connector and also causes the problem of dripping water into the passenger compartment.

Therefore, various waterproof measures have been taken for the wire harness that is laid in a water-exposed area such as the engine room where water is likely to splash. As one of them, a filler is injected into a portion where the grommet is inserted. Then, the gap between the electric wires and the gap between the electric wires and the inner peripheral surface of the grommet are filled with a filler to stop water.

As shown in FIG. 5, the grommet usually has a large diameter portion 1 having a locking groove 1a for locking the vehicle body formed on the outer peripheral surface and a large opening 1b at one end of the large diameter portion 1. The reduced diameter portion 2 that is provided with a continuous reduced diameter portion 2 and injects the filler 3 from the large opening portion 1b to tightly fit the wire harness (electric wire group) W.
Has penetrated into. In the grommet G having the above-described shape, since the volume of the expanded diameter portion 1 is large, the amount of the filler 3 is large and the cost is high. While not penetrating into the, there is a risk of hardening in the state of being accumulated on the expanded diameter portion 1 side.

Therefore, as shown in FIG. 6, a cylindrical liquid reservoir 1c is provided in the large opening 1b inside the expanded diameter portion 1, and the electric wire group is passed through the liquid reservoir 1c to the reduced diameter portion 2. There is provided a grommet G ′ having a configuration in which W is inserted and the filler 3 is injected from the tip end opening of the liquid reservoir 1c.

The attachment of the grommets G and G'to the wire harness W and the filling operation into the grommets G and G'shown in FIG. 5 and FIG. 6 both constitute the wire harness W in the first step. The wire harness W is bundled with the electric wire group and bound with a tape or the like, and the reduced diameter portion 2 of the grommets G and G ′ is expanded by a jig (not shown) about 4 to 7 times in the second step. And in the third step, the tape 4 is wound around and fixed to the tip of the reduced diameter portion 2 and the wire harness W so that the grommets G, G ′ are located at the predetermined positions of the wire harness W, and the fourth step Then, with the large opening 1b of the expanded diameter portion 1 of the grommet G, G'standing upright as the upper surface,
The filler 3 is injected into the large opening 1b or the liquid reservoir 1c from a nozzle of an injector (not shown), and the injected filler 3 is cured in the final fifth step.

[0007]

As described above, when the filler 3 is injected from the nozzle into the grommets G and G ', the wire harness W of 1 m or more is projected above and below the grommets G and G', respectively. In addition, the injection work is difficult to do,
Particularly, in the grommet G ′ shown in FIG. 6, the liquid reservoir 1
Since the peripheral wall portion of the expanded diameter portion 1 is located on the outer periphery of c, the expanded diameter portion 1 becomes a hindrance when moving the nozzle and the like, and there is a problem that the filling work of the filler 3 is very difficult. is there. Further, in the case of FIG. 6, since the inner diameter side of the expanded diameter portion 1 becomes a space after being attached to the through hole 5a of the partition plate 5, this portion may be elastically deformed and fall off.

Since the step of injecting the filler 3 into the grommets G and G'is performed after the first step to the third step as described above, it is necessary to perform it on the line of the assembly process of the wire harness W. was there. As described above, due to the limitation of the process organization, it is impossible to perform the injection process of the grommets G and G'on another line or another place.

In addition, recently, as the above-mentioned filler, the viscosity at the time of injection is low, the permeability between electric wires is good, and
A two-component filler that is fast-curing and has no risk of flowing out from the tip of the diameter-reduced portion 2 and permeating to unnecessary areas is widely used. However, if this mixed solution is not filled into grommet G, G'quickly, there is a problem of hardening, and it is preferable to inject into grommet G, G'collectively within a short time. As described above, when the wire harness W is assembled on the assembly line, there is a problem in that the filling process of the filler 3 is an intermittent work because the required time is required from the first process to the third process.

The present invention has been made in view of the above-mentioned problems, and the work of injecting the filler into the grommet can be easily performed, and furthermore, in the process of assembling the wire harness, the process of assembling the grommet and injecting the filler. It is an object of the present invention to make it possible to change the packing material without being restricted as in the conventional case, so that the filler injection work can be carried out collectively in another line or another place.

[0011]

In order to achieve the above object, the present invention provides a grommet according to claim 1, wherein the wire harness is inserted into the through hole of the partition plate in a water-stopped state. It is composed of a cylindrical outer member having an outer peripheral surface provided with a locking groove to the peripheral edge of the through hole, and a cylindrical inner member inserted into the outer member, and the outer member and the inner member are formed of an elastic body. In addition, the inner diameter of the outer member is set to be equal to or less than the outer diameter of the inner member, and the inside of the inner member is preliminarily inserted with the wire harness, and the filler is injected and cured to make the wire harness. The grommet is characterized in that an inner member inserted in a water-stopped state is press-fitted and fixed to the outer member.

According to a second aspect of the present invention, there is provided a grommet in which the outer peripheral surface of the inner member and the inner peripheral surface of the outer member are provided with concave and convex portions for positioning which are engaged with each other.
For example, an annular protrusion is provided on the outer peripheral surface of the inner member while an annular recess is provided on the inner peripheral surface of the outer member. Further, in claim 3, the outer member comprises a diameter-enlarged portion whose outer peripheral surface is enlarged and a diameter-reduced portion continuous with one end of the diameter-enlarged portion, and the locking groove is formed on the outer peripheral surface of the diameter-enlarged portion. On the other hand, a grommet is provided in which, on the other hand, one end of the inner member is provided with a flange portion that is engaged with the end surface of the expanded diameter portion of the outer member. Further, in claim 4, there is provided a conical cylindrical grommet in which the inner member and the outer member are gradually reduced in diameter from one end to the other end.

Further, according to a fifth aspect of the present invention, there is provided a grommet in which a two-component filler is used as a filler to be injected into the inner member while being inserted into the wire harness. The two-component filler is composed of a main agent and a curing agent, a polyether polyol or the like is used as the main agent, and a fatty isocyanate is preferably used as the curing agent. Tolylene diisocyanate, methylene diisocyanate, diphenyl Methane or the like can also be used. Needless to say, the filler used in the present invention is not limited to the above-mentioned two-component filler.

[0014]

In the grommet according to the first aspect, first, the wire group of the wire harness is inserted into the inner member, and the filler is injected from one end of the inner member. The inner member, in which the filler is hardened and the electric wire group is inserted in a water-proof state, is inserted into the outer member. At that time, since the inner diameter of the outer member is set to be the same or smaller than the outer diameter of the inner member,
The inner member receives a compressive force from the outer member to obtain a proper adhesion, so to speak, it is pressed and fixed.
As described above, since the filler is injected into the inner member, there is no peripheral wall portion of the outer member that interferes with the injection, and the injection work is facilitated. Moreover, since the attachment to the outer member is performed after the filler is injected, the injection work does not necessarily have to be performed in the assembly process of the wire harness. Therefore, the injection work can be performed collectively, and particularly when the two-component filler is used as the filler as described in claim 5, the problem of curing the mixed liquid can be solved.

Further, as described in claim 2, when the concave and convex portions are provided and locked between the fitted inner member and outer member, the inner member and the outer member can be fitted and fixed at a predetermined position. The locking prevents the disengagement. Further, as described in claim 3, when the flange portion projecting from one end of the inner member is locked to the end surface of the outer member, a tensile force acts on the wire harness fixed to the inner member via the filler. However, the inner member is locked to the outer member and does not separate from the outer member.

When the inner member and the outer member are conical, the inner member is slid from the large diameter side of the outer member to the small diameter side of the inner member when the inner member is inserted into the outer member. By inserting it, you can insert it without requiring a large insertion force,
Therefore, it is not necessary to expand the outer member with the jig.

Furthermore, when a two-component filler is used as the filler as described in claim 5, it has a low viscosity at the time of filling, so that it has good permeability between electric wires and is rapidly cured. Therefore, the filler injected from the upper end of the inner member can be prevented from flowing out from the lower end of the inner member to an unnecessary region.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 and 2 show a grommet according to the first embodiment, in which the grommet is attached to a through hole 10a for inserting a wire harness provided in a partition plate 10 between an engine room side X and a vehicle room side Y of a vehicle. It is supposed to be done.

This grommet comprises an outer member 11 and an inner member 12. The outer member 11 is formed by integrally molding the expanded diameter portion 11a and the reduced diameter portion 11b, and for example, an elastic material such as rubber can be used. The inner diameter of the outer member 11 is constant in the axial direction, and is smaller than the outer diameter of the inner member 12 described below.
A locking groove 11c is formed on the outer peripheral surface of the expanded diameter portion 11a. The locking groove 11c is configured to lock on the peripheral edge of the through hole 10a and to mount the grommet on the partition plate 10. Further, on the inner peripheral surface of the outer member 11 on the side of the expanded diameter portion 11a, a pair of annular recessed portions 11d are provided side by side.

The inner member 12 has a substantially cylindrical shape, and is integrally molded of rubber like the outer member 11, and is made of a material having a hardness higher than that of the outer member 11.
The inner member 12 has a constant inner and outer diameter in the axial direction,
A flange portion 12a that projects outward in the radial direction is provided on one end side, and a pair of annular convex portions 12b that are engaged with the annular concave portions 11d are arranged in parallel on the outer peripheral surface in the vicinity thereof (FIG. 2). reference). On the other hand, at the other end of the inner member 12,
The closed portion 12d has a through hole 12c through which the wire harness W is inserted at the center.

The inner member 12 and the wire harness W
A filler 13 is filled in between. As the filler 13, for example, a two-component filler having a main component such as polyether polyol and a curing agent such as an aliphatic isocyanate is used.

The grommet having the above structure is attached to the wire harness W as follows. That is,
First, the wire harness W is inserted through the inner member 12 to position the inner member 12 at a predetermined position. In this case, the inner member 12 is expanded by a jig (not shown). Since the through hole 12c formed in the end surface of the inner member 12 is formed smaller than the outer diameter of the wire harness W, it is temporarily fixed.

Next, the flange portion 12 of the inner member 12
The filler 13 is injected from the opening of the inner member 12 on the side of the flange portion 12a with the side a standing upright. In this case, the inner member 1 is attached to the outer peripheral portion of the wire harness W.
Since only 2 is located, the workability is improved without hindering the movement of the filler injection nozzle (not shown). The injected filler 13 has a high permeability, fills the gaps between the electric wires forming the wire harness W without leaks, and has a rapid hardening property, and therefore flows downward through the through hole 12c of the closing portion 12d. There is no such thing.

The inner member 12 fixed at a predetermined position of the wire harness W with the above-mentioned filler 13 is attached to the outer member 1.
Insert into 1 and assemble. That is, the inner member 12
The expanded diameter portion 11a of the outer member 11 from the closed portion 12d side of the
And slide the outer member 11 on the outer peripheral portion of the inner member 12.

In this case, the expanded diameter portion 11 of the outer member 11
The annular recess 11 formed in the outer member 11 can be formed by simply bringing the end surface of a into contact with the flange portion 12a of the inner member 12.
The annular convex portion 12b formed on the inner member 12 can be locked at d, and the mounting operation is easy.

Since the inner diameter of the outer member 11 is smaller than the outer diameter of the inner member 12 and the outer member 11 is made of an elastic material, the inner member 11, the filler 13 and the wire. Harness w
Since an appropriate compressive force is applied to the outer member 11 to provide good waterproofness, and an appropriate degree of adhesion is obtained between the outer member 11 and the inner member 12, the outer member 11 is securely fixed to the inner member 12.

The grommet thus mounted on the wire harness W is inserted from the reduced diameter portion 11b side of the outer member 11 into the through hole 10a formed in the partition plate 10 of the automobile, and the enlarged diameter portion of the outer member 11 is inserted. By attaching the peripheral edge of the through hole 10a formed in the partition plate 10 to the locking groove 11c formed on the outer periphery of the partition plate 11a, it is attached to the partition plate 10.

In the attached state, the outer member 11
Annular concave portion 11d and annular convex portion 12b of the inner member 12
Since the locking portion of is located at a portion corresponding to the locking groove 11c with which the partition plate 10 is locked, it is hard to fall off. Further, even if a pulling force may act on the right side in FIG. 1 with respect to the wire harness W, the flange portion 12a of the inner member 12 integrated with the wire harness W via the filler 13 causes the outer member 11 Separator 1 at the end
It will not fall out because it will be pressed between 0 and.

3 and 4 show a grommet according to the second embodiment. This grommet has substantially the same structure as that of the first embodiment except that the following points are different (in FIGS. 3 and 4,
Corresponding members are designated by reference numerals with 10 added. ). That is, in the inner member 22, the flange portion 2
The outer diameter gradually increases toward the 2a side, and the outer member 21 is formed so that the inner diameter gradually increases toward the enlarged diameter portion 21a side.

Therefore, in the grommet according to the second embodiment, when the outer member 21 is mounted on the outer peripheral portion of the inner member 21, a spreading jig is unnecessary. In other words, by fitting the outer diameter of the outer member 11 to the smaller diameter of the inner member 12 and sliding the outer member 21 along the wire harness W, the outer member 21 becomes the inner member 2.
2 is gradually expanded along the outer peripheral surface of the device 2 and can be mounted without difficulty.

In each of the above embodiments, the grommet has a substantially cylindrical shape, but it may of course have a polygonal shape. In addition, in each of the above embodiments, the inner members 12, 2
2, the annular convex portions 12b and 22b, the outer member 1
Although the annular recesses 11d and 21d are formed on the inner peripheral surfaces of the Nos. 1 and 21, the annular recesses are formed on the outer peripheral surfaces of the inner members 12 and 22 and the annular protrusions are formed on the inner peripheral surfaces of the outer members 11 and 21, respectively. You may do it. Further, in each of the above-described embodiments, the injection of the fillers 13 and 23 is performed on the same assembly line together with the mounting of the outer member 11 and the like.
It may be performed separately in advance, which increases the flexibility of the mounting work.

[0032]

As is apparent from the above description, according to the grommet according to the invention described in claim 1, the wire harness is inserted into the inner member which is different from the outer member directly attached to the partition plate of the automobile. Since the filler is injected in this state, unlike the conventional case, the diameter-expanded portion does not interfere with the movement of the filler injection nozzle and the like, and the injection operation can be performed easily. In addition, the amount of the filler to be used is small, and this filling work can be performed in advance separately from the other steps, resulting in good work efficiency. In particular, it is convenient for a two-component filler having fast setting property. Furthermore, since the inner diameter of the outer member is made smaller than the outer diameter of the inner member, proper adhesion can be obtained between them and the outer member is less likely to fall off.

According to the grommet according to the second aspect of the present invention, since the concave and convex portions for positioning are formed on the inner member and the outer member respectively, the outer member can be more effectively prevented from falling off. .

According to the grommet according to the third aspect of the invention, since the end portion of the outer member is located between the partition plate and the flange portion formed on the inner member,
Even if an external force is applied to the wire harness, the flange portion of the inner member presses the end portion of the outer member against the partition plate, and the outer member does not fall off.

According to the grommet according to the invention described in claim 4, since the inner member and the outer member are formed in a conical cylindrical shape whose diameter gradually decreases from one end to the other end, a special jig is required. Without doing so, the outer member can be easily attached to the inner member.

According to the grommet according to the fifth aspect of the present invention, since the two-component filler having a rapid hardening property is used, the workability is good and the water blocking effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a sectional view of a grommet according to a first embodiment.

FIG. 2 is a perspective view showing a state before the outer member of FIG. 1 is attached.

FIG. 3 is a sectional view of a grommet according to a second embodiment.

FIG. 4 is a perspective view showing a state before the outer member of FIG. 2 is attached.

FIG. 5 is a front partial cross-sectional view of a grommet according to a conventional example.

FIG. 6 is a front partial cross-sectional view of a grommet according to another conventional example.

[Explanation of symbols]

10 ... Partition plate, 10a ... Through hole, 11,21 ... Outer member, 12,22 ... Inner member, 13 ... Filler, W ... Wire harness.

Claims (5)

[Claims] 1. A grommet to be inserted into a through hole of a partition plate while inserting a wire harness in a water-stopped state, the tubular outer member having an engaging groove on an outer peripheral surface for engaging with a peripheral edge of the through hole. And an inner member having a tubular shape to be inserted into the outer member, wherein the outer member and the inner member are formed of an elastic body, and the inner diameter of the outer member is set to be equal to or less than the outer diameter of the inner member. Inside of the member, a filler is injected and cured in a state in which the wire harness is inserted in advance, and an inner member inserted through the wire harness in a water-tight state is press-fitted and fixed to the outer member. Is a grommet. 2. The grommet according to claim 1, wherein the outer peripheral surface of the inner member and the inner peripheral surface of the outer member are provided with concave and convex portions for positioning that are engaged with each other. 3. The outer member comprises a diameter-enlarged portion whose outer peripheral surface is enlarged and a diameter-reduced portion which is continuous with one end of the diameter-enlarged portion.
The locking groove is provided on the outer peripheral surface of the expanded diameter portion, and a flange portion that is locked to the end surface of the expanded diameter portion of the outer member is provided at one end of the inner member so as to project. Item 2. The grommet according to Item 2. 4. The grommet according to claim 1, wherein each of the inner member and the outer member has a conical cylindrical shape whose diameter gradually decreases from one end to the other end. 5. The grommet according to claim 1, wherein a two-component filler is used as a filler to be injected into the inner member while being inserted into the wire harness.