JP6401957B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet that seals between a wire harness passed through an opening of a panel and the opening.

  A grommet is used as a member that seals between the opening of the panel and the wire harness that passes through the opening. As a grommet, the outer part of the part of the wire harness constituting the wire harness that is integrated with the grommet is removed to form a gap between the adjacent wires, and such a wire harness is set in a mold for grommet molding. In some cases, injection molding is performed to fill a gap between adjacent electric wires with a molding material to stop water between the electric wires (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 11-136834

  In the grommet described above, there is a possibility that the wire is damaged by integrally forming the molding material directly on the outer skin removal portion of the wire. Moreover, since the displacement in the longitudinal direction of the electric wire is regulated by the grommet, the electric wire integrally formed with the grommet may be damaged by the pulling force acting on the wire harness.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the grommet which can ensure favorable water stop, protecting an electric wire reliably.

In order to achieve the above-described object, the grommet according to the present invention is characterized by the following (1) and (2).
(1) It is made of a resin material that is watertightly provided around a plurality of wire harnesses inserted through the opening of the panel, and that is watertightly fixed to the panel and seals between the panel and the wire harness. Grommet,
The wire harness has a tubular outer sheath and an electric wire inserted through the outer sheath, and a small diameter portion having an outer diameter smaller than other portions is provided in a part of the longitudinal direction of the outer sheath,
The plurality of wire harnesses are arranged in parallel with each other in contact with other portions other than the small diameter portion in a state where the small diameter portion is aligned in the longitudinal direction.
The grommet, wherein the resin material is integrally formed in the small diameter portion of the plurality of wire harnesses.
(2) The exterior has reinforcing ribs on the outer periphery,
The grommet according to (1), wherein the small-diameter portion is a portion without the reinforcing rib in the exterior.

In the grommet configured as described above (1), the plurality of wire harnesses arranged in parallel have a gap formed in the small diameter portion of the exterior, and the resin material is integrally formed in the small diameter portion where the gap is formed. . Therefore, the gap between the wire harnesses is filled with the resin material so that the resin material and the wire harness are in good contact with each other, and good water stoppage between the wire harnesses can be ensured. And since the electric wire is penetrated by the exterior also in the integral molding location of the resin material, an electric wire can be reliably protected by the exterior.
In addition, the wire harnesses are placed in parallel with each other as compared with the case where the wire harnesses are separated from each other, so that the diameter of the bundle of wire harnesses can be reduced, and thus the grommet can be downsized. it can. Further, the resin material can be reduced by downsizing the grommet, and the material cost can be suppressed.
In the grommet configured as described in (2) above, the resin material is filled in the gap formed by the small-diameter portion without the reinforcing rib by bringing the wire harness into contact with each other and arranged in parallel, so that the resin material and the wire harness are in close contact with each other. Is done. Thereby, favorable water stop can be ensured, aiming at size reduction of a grommet. Moreover, an electric wire can be more reliably protected by the exterior | packing whose intensity | strength was improved by having a reinforcement rib.

  ADVANTAGE OF THE INVENTION According to this invention, the grommet which can ensure a favorable water stop can be provided, protecting an electric wire reliably.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a longitudinal sectional view of a grommet according to the present embodiment. FIG. 2 is a side view of the small-diameter portion of the exterior constituting the wire harness. 3A and 3B are diagrams illustrating the grommet according to the present embodiment, in which FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a longitudinal sectional view of a grommet according to a reference example. 5 is a cross-sectional view taken along the line CC in FIG.

Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a grommet according to the present embodiment. In FIG. 1, the grommet 10, the panel P, and a part of the wire harness WH accommodated in the grommet 10 are viewed in cross section, and the remaining other part of the wire harness WH is viewed in side view.

  As shown in FIG. 1, the grommet 10 according to the present embodiment is fixed to a panel P of a vehicle such as an automobile. The grommet 10 is formed from a resin material R having elasticity such as rubber and elastomer. An opening 1 is formed in the panel P, and a plurality (two in this example) of wire harnesses WH are inserted into the opening 1. Thereby, the wire harness WH is wired over the front and back of the panel P.

  The grommet 10 is formed in a circular shape in plan view. The grommet 10 is integrally formed around the wire harness WH. The grommet 10 has a flange portion 11 that protrudes outward on the outer periphery thereof. The grommet 10 has a tapered insertion portion 12 and is inserted into the opening 1 of the panel P from the insertion portion 12 side. Further, the outer periphery of the grommet 10 has an engagement groove 13 extending in the circumferential direction at a position adjacent to the insertion portion 12 side in the flange portion 11. The edge of the opening 1 of the panel P is engaged with the engagement groove 13.

  FIG. 2 is a side view of the small-diameter portion of the exterior constituting the wire harness. 3A and 3B are diagrams illustrating the grommet according to the present embodiment, in which FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line BB in FIG.

  As shown in FIGS. 2 and 3A and 3B, each wire harness WH has a tube-shaped exterior 20 and an electric wire 21. These wire harnesses WH have, for example, a high-voltage circuit electric wire 21 on one side and a low-voltage circuit electric wire 21 on the other side.

  The exterior 20 is made of resin, and an electric wire 21 is inserted through the exterior 20. Thereby, the electric wire 21 is protected over the longitudinal direction by the exterior 20. A lattice-shaped reinforcing rib 23 is formed on the outer periphery of the exterior 20. The reinforcing rib 23 includes a vertical rib 23a along the longitudinal direction and a horizontal rib 23b along the circumferential direction. The strength of the exterior 20 is enhanced by the reinforcing ribs 23.

  The exterior 20 has a small diameter portion 25 where the reinforcing rib 23 is not provided. In this small diameter part 25, compared with the other part in which the reinforcing rib 23 was provided, since the reinforcing rib 23 is not provided, the outer diameter is reduced.

  The wire harnesses WH having the exterior 20 are arranged in parallel while being in contact with each other in a state where the small diameter portions 25 are aligned in the longitudinal direction. Thereby, as shown in FIG. 3A, the wire harnesses WH are in a state where they are in contact with each other, as shown in FIG. 3A, and in the portion of the small diameter portion 25, the portions shown in FIG. Thus, the gap G is formed.

  The grommet 10 is integrally formed in the portion of the small diameter portion 25 of the wire harness WH in which the gap G is formed. Thus, the grommet 10 is integrally molded by the small diameter part 25, The resin material R which forms the grommet 10 is filled into the clearance gap G between the small diameter parts 25 of the wire harness WH. Thereby, the periphery of each wire harness WH is stopped by the resin material R of the grommet 10.

  In order to attach the grommet 10 to the panel P of the vehicle, one end side of the wire harness WH is inserted into the opening 1 formed in the panel P, and then the insertion portion 12 of the grommet 10 is inserted into the opening 1 of the panel P. Insert until the flange 11 comes into contact with the panel P. Then, the edge of the opening 1 is engaged with the engagement groove 13 of the grommet 10. In this way, the grommet 10 is fixed to the panel P, and the space between the wire harness WH and the panel P is made watertight by the grommet 10.

Next, a case where the grommet 10 is molded will be described.
A plurality of wire harnesses WH are arranged in parallel so as to contact each other so that the small diameter portion 25 of the exterior 20 coincides with the longitudinal direction.

  The wire harnesses WH arranged in parallel are installed in a mold (not shown) for molding the grommet 10. Specifically, the small-diameter portion 25 of the exterior 20 is disposed in a cavity (not shown) that is a resin filling space in the mold.

  The mold cavity is filled with a molten resin, and after the molten resin is cured, the grommet 10 is taken out of the mold.

  As described above, according to the grommet 10 according to the above-described embodiment, the plurality of wire harnesses WH arranged in parallel have the gap G formed in the small diameter portion 25 without the reinforcing rib 23, and the gap G The resin material R is integrally formed with the small diameter portion 25 where the is formed. Therefore, the resin material R is filled in the gap G between the wire harnesses WH, and the resin material R and the wire harness WH are satisfactorily adhered to each other, and good water stoppage between the wire harnesses WH can be ensured. And since the electric wire 21 is penetrated by the exterior | packing 20 also in the integral molding location of the resin material R, the electric wire 21 can be reliably protected by the exterior | packing 20. Moreover, the electric wire 21 can be more reliably protected by the exterior 20 having increased strength by having the reinforcing ribs 23.

Here, the grommet which concerns on a reference example is demonstrated.
FIG. 4 is a longitudinal sectional view of a grommet according to a reference example. 5 is a cross-sectional view taken along the line CC in FIG. In FIG. 4, the grommet 100 and the panel P are viewed in cross section, and the wire harness WH is viewed in side view.

  As shown in FIG. 4, the grommet 100 according to the reference example uses the exterior 20 without the small diameter portion 25. In this grommet 100, the gaps G are formed by arranging the wire harnesses WH apart from each other in parallel, and the resin material R is integrally formed so as to cover the periphery of the wire harnesses WH.

  As shown in FIG. 5, also in the case of the grommet 100 according to this reference example, the resin material R is filled in the gap G between the wire harnesses WH so that the resin material R and the wire harness WH are well adhered to each other. Intermittent water stopping is ensured. In addition, since the electric wire 21 is inserted into the outer sheath 20 even in the integrally molded portion of the resin material R, the electric wire 21 is protected by the outer sheath 20.

  However, in this grommet 100, since the gap G is formed by separating the wire harnesses WH and arranging them in parallel, the diameter of the bundle of the wire harnesses WH becomes large. For this reason, the grommet 100 will be enlarged and material cost will also increase.

  On the other hand, in the grommet 10 of the present embodiment, the resin material R is filled into the gap G formed by the small diameter portion 25 without the reinforcing rib 23 by bringing the wire harness WH into contact and arranging them in parallel. R and the wire harness WH are in good contact with each other. Accordingly, the diameter of the bundle of wire harnesses WH can be reduced compared to the case where the wire harnesses WH are separated from each other to form the gap G, and thus the grommet 10 can also be reduced in size. Further, the resin material R can be reduced by downsizing the grommet 10, and the material cost can be suppressed.

  That is, according to the grommet 10 according to the present embodiment, it is possible to ensure good water stop while reliably protecting the electric wire 21 and to further reduce the size.

  In addition, although the case where the number of the wire harnesses WH was two was illustrated and demonstrated in the said embodiment, if the number of the wire harnesses WH is two or more, three or more may be sufficient.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

Here, the features of the above-described grommets according to the present invention are summarized and listed in the following (1) and (2), respectively.
(1) Watertightly provided around a plurality of wire harnesses (WH) inserted through the opening (1) of the panel (P), and watertightly fixed to the panel (P). And a grommet (10) made of a resin material (R) that seals between the wire harness (WH),
The wire harness (WH) has a tube-shaped exterior (20) and an electric wire (21) inserted through the exterior (20), and in a part in the longitudinal direction of the exterior, than other parts. A small diameter portion (25) having a small outer diameter is provided;
The plurality of wire harnesses (WH) are arranged in parallel with each other in contact with other parts other than the small diameter part (25) in a state where the small diameter part (25) is aligned in the longitudinal direction.
The grommet, wherein the resin material (R) is integrally formed with the small diameter portion (25) of the plurality of wire harnesses (WH).
(2) The exterior (20) has a reinforcing rib (23) on the outer periphery,
The said small diameter part (25) consists of a part without the said reinforcement rib (23) in the said exterior (20). The grommet as described in (1) characterized by the above-mentioned.

1 Opening 10 Grommet 20 Exterior 21 Electric Wire 23 Reinforcement Rib 25 Small Diameter P Panel R Resin Material WH Wire Harness

Claims (2)

A grommet made of a resin material that is watertightly provided around a plurality of wire harnesses that are inserted through the opening of the panel, and that is watertightly fixed to the panel and seals between the panel and the wire harness. And
The wire harness has a tubular outer sheath and an electric wire inserted through the outer sheath, and a small diameter portion having an outer diameter smaller than other portions is provided in a part of the longitudinal direction of the outer sheath,
The plurality of wire harnesses are arranged in parallel with each other in contact with other portions other than the small diameter portion in a state where the small diameter portion is aligned in the longitudinal direction.
The grommet, wherein the resin material is integrally formed in the small diameter portion of the plurality of wire harnesses. The exterior has reinforcing ribs on the outer periphery,
The grommet according to claim 1, wherein the small-diameter portion is a portion without the reinforcing rib in the exterior.

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