JP3152062B2 - One-touch grommet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-touch grommet for fixing a wire harness to a plate while positioning the wire harness with respect to the hole when the wire harness is passed through a hole formed in a plate such as a partition plate. is there.

[0002]

2. Description of the Related Art For example, when a hole is made in a plate material such as a partition plate for separating an engine room and a room of an automobile, and when a wire harness is made to penetrate the hole, an edge of the hole hits and the wire harness is damaged. Grommets have been used to fix the wire harness to the plate while positioning the wire harness with respect to the hole, and to keep the partition plate waterproof. Recently, however, one-touch grommets 9 as shown in FIG. 5A have been used for the purpose of improving the assembling work (for example, Japanese Utility Model Laid-Open No. 59-1575783).

The one-touch grommet 9 includes a grommet body 91 made of a flexible material such as rubber and an engagement ring 92 fitted to the grommet body 91 and made of a hard and elastic material such as polypropylene. Become. The grommet body 91 has a substantially funnel-like shape similar to a conventional grommet, and has a wire harness W on its top.
A through hole 91a through which the wire bundle W1 is inserted is provided, and a skirt portion 91b of the through hole 91a is in contact with an edge of the hole P1 of the plate P.

As shown in FIG. 5 (b), the engagement ring 92 has a flange 92a fitted to the grommet main body 91.
A bottom portion provided with a substantially dome-shaped hole 92b at the center, through which the wire bundle W1 is inserted, protrudingly arranged outside the grommet body 91 in a state fitted to the grommet body 91 by the flange portion 92a. Material 92c and the bottom member 92
c, from the side in the radial direction and the grommet body 9
A plurality of (four in the figure) elastic engaging pieces 92d are provided extending in one direction.

[0005] The bottom member 92c is formed to have an outer dimension that allows the hole P1 of the plate material P to be inserted. Also, the elastic engagement piece 92d
The bottom of the bottom member 92c is elastically deformed when the bottom member 92c is inserted into the hole P1 of the plate material P and passes through the hole P1. ), It engages with the edge of the hole P1. Through hole 91 at the top of grommet body 91 of grommet 9
a, the grommet body 9 is disposed at a predetermined position of the wire bundle W1, and then the grommet body 9 is adhered from the vicinity of the top of the grommet body 91 to the wire bundle W1. When the tape T is wound around and the grommet 9 is fixed to the wire bundle W1, the wire harness W is configured.

In order to fix the wire harness W to the plate P, the wire bundle W1 is first inserted into the hole P1 of the plate P, and then the bottom member 92c of the engagement ring 92 of the grommet 9 is removed.
Insert into hole P1. Then, the elastic engagement piece 92d of the engagement ring 92 passes through the hole P1 while being elastically deformed as described above, and then engages with the edge of the hole P1. Then, as shown in FIG. 9A, the tip of the elastic engagement piece 92d and the grommet body 9
The wire harness W including the grommet 9 is fixed to the plate P while positioning the wire harness W including the grommet 9 with respect to the hole P1 of the plate P by sandwiching the plate P with the bottom 91b.

[0007]

In the conventional grommet prior to the one-touch grommet, the engagement recess provided in the skirt portion is engaged with the edge of the hole of the plate material, so that the positioning of the wire harness to the hole and the plate material can be performed. And water resistance at the hole was maintained. However, in the one-touch grommet 9 shown in FIG. 5, the hem 91b of the grommet main body 91 is formed with a hole P of the plate P in order to simplify the mounting of the plate.
There is a problem that the waterproofness becomes insufficient as compared with the conventional one because it is only in contact with one edge.

For example, when a lateral force as shown by a white arrow in FIG. 5A is applied to the wire harness W due to a dimensional tolerance between clips for fixing the wire bundle, etc.
The skirt portion 91b rises and a gap is formed between the skirt portion 91b and the plate material P, or the contact force of the skirt portion 91b with the plate material P becomes weak, so that water easily enters. Further, for example, in the case of an automobile, when high-pressure car washing is performed, water may enter even if the above-described lateral force is not acting on the wire harness.

In addition, since the assembling work of the wire harness in the engine room of the automobile or the like is performed by groping in a place where it cannot be seen, in the conventional one-touch grommet 9, the engaging ring 92 is formed by the hole of the plate P. Forcibly push in at an angle to P1
When pressed against one edge, the elastic engagement piece 9
There is a possibility that the root of 2d may be whitened or the elastic engagement piece 92d may be broken.

[0010] This is because the engaging ring 92 is formed of a general-purpose resin such as polypropylene, which is inexpensive, and the elastic engaging piece 92d is smaller than the size of the engaging ring 92. it is conceivable that. In order to prevent this, it is conceivable to increase the size of the elastic engagement piece 92d. In this case, however, the lateral wall 92e of the bottom member 92c for maintaining the rigidity of the engagement ring 92 becomes relatively small.
There has been a problem that the rigidity of the entire engagement ring 92 is reduced, and the wire harness at the time of assembling or after assembling is easily detached from the plate material by a small external force.

The present invention has been made on the basis of such background art, and is particularly excellent in waterproofness, easy to assemble to a plate material and hard to be detached, and one-touch which is not likely to be damaged even by groping work. It is intended to provide grommets.

[0012]

A one-touch grommet according to the present invention is fixed to an electric wire bundle, constitutes a wire harness together with the electric wire bundle, and is fitted into a hole formed in a plate material to form a wire. In a one-touch grommet for fixing a harness to a plate material, a body having a thick annular shape and an outer diameter larger than an inner diameter of a hole of the plate material, and a thin-film end plate extending inward from one end face of the body. And an electric wire bundle fixing portion formed on the end plate, into which the electric wire bundle is inserted and fixed, and a hole in a plate formed at an end of the body opposite to the end on which the end plate is formed. An insertion portion into the hole, which is formed of an annular body having an outer diameter that can be inscribed on the inner peripheral surface of the plate, is integrally formed of a flexible material, and a step surface between the insertion portion and the body contacts the plate material surface. Grommet body with A cylindrical body which is internally fitted to the annular body of the main body such that one end of the body protrudes outside the body, and a radially outwardly extending one end of the cylindrical body, which protrudes outside the body, And extended in the direction of the step surface of the grommet body,
A plurality of elastic engaging pieces and an engaging ring integrally formed of a hard and elastic material ;
The wire bundle fixing part of the main body has a through hole through which the wire bundle is inserted.
From the surface of the head plate in the direction opposite to the fuselage.
Those characterized that you have been constituted by a deformable cylindrical body with respect to the direction of the force.

Further, one-touch grommet of the invention of claim 2, wherein the elastic engagement members of the engagement ring, is characterized in that it has 10% or more of the width of the diameter of the cylindrical body.

[0014]

According to the one-touch grommet according to the first aspect of the invention, when the wire harness is positioned and fixed in the hole of the plate member, not only the contact portion of the grommet body abuts the edge of the hole, but also the insertion portion has Since it is inserted into the hole while being in contact with the inner peripheral surface of the hole of the plate material, it has higher waterproofness than a conventional one-touch grommet that simply abuts the hem of the plate material at the edge of the hole of the plate material. are doing. In addition, since the body of the grommet body is fitted with a hard engagement ring cylinder, even if a lateral force acts on the wire harness,
The body does not deform and the contact portion does not rise from the plate material, and a gap is not formed between the insertion portion and the hole of the plate material, so that high waterproofness can be maintained.

In addition, as in the conventional case, it is only necessary to allow the elastic engagement piece of the engagement ring to pass through the hole of the plate while elastically deforming the same, and then to engage with the edge of the hole. It is easy to assemble to a plate material. Also, the wire bundle fixing portion of the grommet body, since it is constituted by a deformable cylindrical body against lateral forces, when the lateral force as described above is applied to the wire harness, the tube Since the wire bundle fixing portion composed of the body is deformed and adapted to the deformation, the lateral force is hardly applied to the body of the grommet main body, and as a result, the waterproofness can be further improved. In addition, since the wire bundle fixing portion made of a cylindrical body is easily deformed by a lateral force as described above, it is possible to flexibly cope with, for example, dimensional tolerance between clips for fixing the wire bundle. .

Further, in the one-touch grommet according to the second aspect of the present invention, the elastic engagement piece of the engagement ring includes:
Since it is formed in a large shape having a width of 10% or more of the diameter of the cylindrical body, it is possible to reliably prevent the engagement ring from being easily broken even in the groping assembly operation. Also, the rigidity of the entire engagement ring is maintained by the cylindrical body,
At the time of assembling or after assembling, the wire harness at the time of packing is prevented from being easily detached from the plate material due to external force.

[0017]

An embodiment of the present invention will be described below in detail with reference to the drawings. As shown in FIGS. 1 (a) and 1 (b),
The one-touch grommet A of this embodiment includes a grommet main body 1 and an engagement ring 2. The grommet body 1 is entirely formed of a flexible material such as rubber or soft resin, and has a thick annular shape as shown in FIGS. 2 (a) to 2 (c). A body 10 whose diameter is larger than the inner diameter of the hole of the plate material, a thin-film end plate 11 extending inward from one end face of the body 10, and a wire bundle formed on the end plate 11 are inserted therethrough. A wire bundle fixing portion 12 to be fixed, and an annular body formed at the end of the body 10 opposite to the side on which the end plate 11 is formed and having an outer diameter capable of inscribing the inner peripheral surface of the hole of the plate material. Insertion part 13 into the above-mentioned hole which consists of
And

In the above embodiment, the wire bundle fixing portion 12 has a through hole 12a through which the wire bundle is inserted.
1 is constituted by a cylindrical body protruding from a substantially central portion in a direction opposite to the body 10. In addition, a step surface between the insertion portion 13 and the body 10 is a contact portion 14 to a plate material surface, and an outermost edge thereof has an annular ridge 14a for maintaining waterproofness when contacting the plate material. Are formed.

Further, at a position on the inner peripheral surface of the body 10 on the back surface of the end plate 11, a locking projection 20 of the engagement ring 2 described later is provided.
An annular groove 10a with which a is engaged is formed over the entire circumference. On the other hand, the entire engagement ring 2 is
It is integrally formed of a hard and elastic material such as polypropylene. As shown in FIGS. 3A to 3C, one end of the annular body 10 of the grommet body 1 is attached to the body. A cylindrical body 20 that is fitted inside so as to protrude outside the body 10, and one end of the cylindrical body 20 that protrudes outside the body 10, in a radially outward direction and in a direction of the step portion 14 of the grommet body 1. And a plurality of (eight in the figure) elastic engaging pieces 21 extended to the front end.

Each elastic engagement piece 21 has a
The width is about 54% of the diameter of the cylindrical body 20 in the embodiment, and the width of the engagement ring is not limited even when groping. Can be reliably prevented from being easily damaged. In addition, since the rigidity of the entire engagement ring 2 is maintained by the cylindrical body 20, it is prevented that the wire harness at the time of assembling or after assembling and at the time of packing is easily detached from the plate material by an external force.

The cylindrical body 20 is formed on the inner peripheral surface of the body 10 of the grommet body 1 at four locations on the outer periphery of the end opposite to the side on which the elastic engaging pieces 21 are formed. A locking projection 20a that engages with the formed annular groove 10a protrudes radially outward. As shown in FIGS. 1 (a) and 1 (b), the grommet body 1 and the engagement ring 2
Is assembled into the annular body 10 of the grommet body 1 by fitting the locking projections 20a of the cylinder 20 into the grooves 10a on the inner peripheral surface of the body 10.

Then, as shown in FIG. 4A, the wire bundle W1 is inserted into the through hole 12a of the wire bundle fixing portion 12 of the grommet body 1, and the one-touch grommet A is arranged at a predetermined position of the wire bundle W1. After that, the adhesive harness T is wound around the wire bundle W1 from the wire bundle fixing portion 12 of the grommet main body 1, and the one-touch grommet A is fixed to the wire bundle W1, whereby the wire harness W is configured.

In order to fix the wire harness W to the plate P, the wire bundle W1 is first inserted into the hole P1 of the plate P, and then the engagement ring 2 of the one-touch grommet A is pressed in the direction indicated by the black arrow in the figure. Then, it is inserted into the hole P1. Then, after the elastic engagement piece 21 of the engagement ring 2 passes through the hole P1 while being elastically deformed, it engages with the edge of the hole P1 (see FIG.
Figure (c)). Then, as shown in FIG.
The wire harness W including the one-touch grommet A is fixed to the plate P while the wire harness W including the one-touch grommet A is positioned with respect to the hole P1 of the plate P by sandwiching the plate P between the tip of the grommet 1 and the contact portion 14 of the grommet body 1. .

At the time of this pressing, as shown in FIG. 4B, the elastically deformed elastic engaging piece 21 is attached to the grommet main body 1.
The insertion portion 13 is also deformed to facilitate the insertion of the insertion portion 13 into the hole P1. The wire harness W fixed to the plate material P as described above is, for example, as shown in FIG.
Even if a lateral force as shown by a white arrow acts on the body 10, the body 20 of the grommet main body 1 has the cylinder body 20 of the hard engagement ring 2 fitted therein, so that the body 10 is deformed. The contact portion 14 does not rise from the plate material P, and a gap is not formed between the insertion portion 13 and the hole P1 of the plate material P, and high waterproofness can be maintained.

Further, in the case of the embodiment, when the above-described lateral force acts on the wire harness W, the wire bundle fixing portion 12 formed of a cylindrical body is deformed to cope therewith. The lateral force is hardly applied to the body 10, and as a result, the waterproofness can be further improved. Moreover, as described above, the wire bundle fixing portion 1 made of a cylindrical body
Since 2 is easily deformed by a lateral force, it is possible to flexibly cope with, for example, a dimensional tolerance between clips for fixing the wire bundle W1.

In each of the embodiments described above, the wire bundle fixing portion 12 is formed of a cylindrical body which can be deformed by a lateral force as described above. The shape of the bundle fixing portion 12 is not limited to a cylindrical body. In addition, the present invention can be variously modified within the scope of the claims without being limited to the description of the embodiments.

[0027]

According to the one-touch grommet according to the present invention, when the wire harness is positioned and fixed in the hole of the plate, not only the contact portion of the grommet body is brought into contact with the edge of the hole, but also the insertion portion is formed. Since it is inserted into the hole while being in contact with the inner peripheral surface of the hole of the plate, higher waterproofness can be obtained as compared with the conventional one-touch grommet. In addition, since the body of the grommet body is fitted with a hard engagement ring cylinder inside, even if a lateral force acts on the wire harness, the body does not deform and maintains high waterproofness. it can. Moreover, assembling to the plate material is similar to the conventional one, after passing the hole of the plate material while elastically deforming the elastic engagement piece of the engagement ring, it is only necessary to engage with the edge of the hole. Is easy to assemble.

In the case where the wire bundle fixing portion is formed of a cylindrical body that can be deformed by a lateral force, when the above-described lateral force acts on the wire harness,
The wire bundle fixing portion deforms and responds to the deformation, and the lateral force is prevented from being applied to the body of the grommet body, so that the waterproofness can be further improved. In addition, since the wire bundle fixing portion made of a cylindrical body is easily deformed by a lateral force as described above, it is possible to flexibly cope with, for example, dimensional tolerance between clips for fixing the wire bundle. .

Further, the elastic engagement piece of the engagement ring is
When the cylinder is formed in a large size having a width of 10% or more of the diameter of the cylinder, it is possible to reliably prevent the engagement ring from being easily broken even by groping. Further, since the rigidity of the entire engagement ring is maintained by the cylindrical body, the wire harness at the time of assembling or after assembling and at the time of packing is prevented from being easily detached from the plate material due to external force.

Therefore, according to the present invention, it is possible to provide a one-touch grommet that is particularly excellent in waterproofness, is easy to assemble to a plate material, is hard to be detached, and is not likely to be damaged even when groping.

[Brief description of the drawings]

FIG. 1A is a front view showing an embodiment of a one-touch grommet according to the present invention, and FIG. 1B is a sectional view of the one-touch grommet according to the embodiment.

FIG. 2A is a plan view of a grommet main body constituting the one-touch grommet of the embodiment, FIG. 2B is a cross-sectional view, FIG. 2C and a bottom view.

FIG. 3 (a) is a front view of an engagement ring constituting the one-touch grommet of the embodiment, FIG. 3 (b) is a plan view,
FIG. 3C is a sectional view.

4 (a) to 4 (c) are cross-sectional views each showing a process of assembling the one-touch grommet of the above embodiment into a hole of a plate material.

FIG. 5 (a) is a cross-sectional view showing a conventional one-touch grommet, and FIG. 5 (b) is a perspective view of an engagement ring constituting the conventional one-touch grommet.

[Explanation of symbols]

 Reference Signs List A One-touch grommet 1 Grommet main body 10 Body 11 Head plate 12 Wire bundle fixing portion 12a Through hole 13 Insertion portion 14 Contact portion 2 Engagement ring 20 Cylindrical body 21 Elastic engagement piece

Claims (2)

(57) [Claims] A one-touch grommet fixed to an electric wire bundle to form a wire harness together with the electric wire bundle, fitted into a hole formed in a plate material, and fixing the wire harness to the plate material. A body having an outer diameter larger than the inner diameter of the hole of the plate, a thin-film end plate extending inward from one end face of the body, and the wire bundle formed on the end plate being inserted therethrough. The wire bundle fixing portion to be fixed, and from the annular body having an outer diameter that can be inscribed on the inner peripheral surface of the plate material hole formed at the end of the body opposite to the side where the end plate is formed, Become,
The insertion part into the hole is integrally formed of a flexible material,
A grommet body provided with a contact portion with a plate material surface on a stepped surface between the insertion portion and the body; A cylinder and a plurality of elastic engagement pieces extending radially outward from the one end of the cylinder protruding outside the body and in the direction of the step surface of the grommet body are hardened. And an engagement ring integrally formed of a material having elasticity, wherein the wire bundle fixing portion of the grommet body is inserted with the wire bundle.
It has a through-hole and projects from the end plate surface in the direction opposite to the fuselage.
With a cylindrical body that can be deformed against lateral forces.
One-touch grommet which is characterized that you have been. 2. The one-touch grommet according to claim 1, wherein the elastic engagement piece of the engagement ring is 10% of the diameter of the cylindrical body.
One-touch grommet that has the above width
G.