JPH04249817A - Grommet - Google Patents

Abstract

PURPOSE:To reduce the cost of parts by common use of the parts, which can be applied to either one type or panel hole, punching hole type or burring type. CONSTITUTION:On the base edge side of a taper part 2 are formed the 1st groove 4, a ring shape protrusion 5 and the 2nd groove 6, in this order. On the base edge side of the 2nd groove 6, a flange part 7, which is protruded radially outward and whose tip edge folded back toward its tip side, is formed. The outer diameter of the utmost base edge side of the taper part 2 is larger than that of the ring shape protrusion 5, and the outer diameter of the 1st groove 4 is larger than that of the 2nd groove part 6. When a fitting process is applied to a burring hole, three-point suspension is made, by a face from the base edge side of the taper part 2 to the 1st groove 4, the outer face of the ring-shape protrusion 5, and the tip face of the flange part 7. When a fitting process is applied to a punching hole, two-point suspension is made, by the 2nd groove part 6 and the flange part 7.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a grommet that is fitted into a panel hole formed in an automobile panel or the like and allows a wire harness to pass therethrough, particularly when the panel hole is either a punched hole type or a burred hole type. Regarding grommets that are also applicable.

0002

[Prior Art] A grommet is made of a flexible material such as rubber, and is fitted into a panel hole formed in an automobile panel to hold a wire harness inside, and has a protective function and waterproofing function for the wire harness. It has the following functions. The types of panel holes to which such grommets are attached can be roughly divided into burring types as shown in FIG. 5 and punching types as shown in FIG. 6. Since both types have different hole shapes, conventionally different types of grommets adapted to both types have been used.

0003

However, if the type of grommet used differs depending on the type of panel hole, the number of types of parts will be doubled, leading to a problem in that the mold cost and ultimately the product cost will increase. Also,
The problem is that as the number of parts increases, the cost of parts management also increases.

The present invention was made to solve the above-mentioned conventional problems, and is applicable to both punched hole type and burring type panel holes, and reduces costs by sharing parts. The purpose of the present invention is to provide a grommet that can be used for various purposes.

[0005]

[Means for Solving the Problems] A grommet according to the present invention has a tapered part formed such that the outer diameter gradually increases from the distal end side to the proximal end side in the direction of insertion into a panel, and the proximal end side of this tapered part. and a fitting portion formed in the hole in the panel to fit into the hole of the panel, and the fitting portion includes a first groove portion formed on the proximal end side of the tapered portion and a base of the first groove portion. an annular protrusion formed on the end side; a second groove formed on the proximal side of the annular protrusion; and a distal edge extending radially outward from the proximal side of the second groove. the outer diameter of the proximal end of the tapered part is larger than the outer diameter of the annular protrusion, and the outer diameter of the second groove is larger than the outer diameter of the first groove. It is characterized by being formed smaller than the diameter.

[0006]

[Operation] When the grommet according to the present invention is inserted into the punched hole, the punched hole is fitted into the second groove. Since the second groove is formed to have a smaller diameter than the first groove, the annular protrusion between the two grooves has a structure that allows it to easily fall toward the second groove and not easily fall toward the first groove. It has become. Therefore, when fitting into a panel hole, the annular protrusion falls toward the second groove, making it easy to insert.After fitting, the annular protrusion does not easily fall toward the first groove, making it easy to insert. It will not fall out and the grommet will be stably held in the panel. Since the collar applies a force that presses the panel from the proximal end to the distal end of the grommet, a seal is formed at two points: the collar and the second groove. In addition, in order to maintain a stable fitting state with the panel hole in the second groove, the height difference from the outer periphery of the annular protrusion to the bottom of the second groove should be 1.5 times the thickness of the panel. It is desirable that there be at least one.

Furthermore, when the grommet according to the present invention is inserted into a burring hole, the rising portion of the burring hole is formed at three points: the surface from the base end of the tapered portion to the first groove portion, the annular projection and the peripheral edge of the collar portion. These three points form a seal. Since the first groove is formed on the base end side of the tapered portion, the tapered portion tends to fall toward the first groove. Therefore, the grommet can be easily inserted into the panel hole during fitting. Furthermore, since the base end of the tapered portion projects outward from the annular groove, the projecting portion prevents the grommet from coming off from the burring hole. In order to maintain a stable fitting state of the burring hole in the tapered part, the difference in height from the outer periphery of the tapered part to the outer periphery of the annular protrusion must be 1.
It is desirable that it be 5 times or more.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing the structure of a grommet according to this embodiment. The grommet 10 is made of a flexible material such as rubber, and includes a hollow cylindrical wire bundle holding tube section 1, a hollow conical tapered section 2 whose outer diameter gradually increases from the base end of the tube section 1, and a hollow cylindrical wire bundle holding tube section 1. It is comprised of a fitting part 3 formed on the proximal end side of this taper part 2 and fitted into a panel hole. The fitting portion 3 includes a first groove portion 4 formed on the proximal end side of the tapered portion 2, an annular projection 5 formed on the proximal end side of the first groove portion 4, and a further proximal portion of the annular projection 5. It is formed by a second groove part 6 formed on the end side and a collar part 7 which extends radially outward from the base end side of the second groove part 6 and whose distal end edge is folded back toward the distal end side. There is. The outer diameter of the annular projection 5 is set smaller than the outer diameter of the proximal end of the tapered portion 2 . Further, the second groove portion 6 is set to have a smaller outer diameter than the first groove portion 4.

FIG. 2 shows details of the fitting portion 3. Tapered part 2
The most proximal end of the first groove 4, the annular projection 5, the second groove 6
A curve of a predetermined curvature is formed at each corner of the flange portion 7 to facilitate the work of attaching the grommet to the panel. Further, the surface from the base end of the tapered portion 2 to the first groove portion 4 may be a flat surface or a sloped surface, but here, in order to further improve the grommet fixing force when installing into a burring hole type panel hole, this surface is used. is a plane perpendicular to the central axis. The step d1 between the outer periphery of the proximal end of the tapered portion 2 and the outer periphery of the annular protrusion 5 is set to, for example, 1.5 times or more the applicable plate thickness so that a burring hole type panel hole can be stably fitted. Set. Furthermore, the step d2 between the outer periphery of the annular protrusion 5 and the outer periphery of the second groove is also set to, for example, 1.5 times or more the applicable plate thickness so that the punched-hole type panel hole can be stably fitted. . Further, the width d3 of the annular projection 5 is set to be, for example, 1.5 times or more the thickness of the plate so that the punched-hole type panel hole does not easily come off.

When the grommet 10 configured as described above is attached to, for example, a burring hole type panel hole, the tip of the collar 7 presses the panel 11 toward the tip of the grommet (section C), as shown in FIG. . For this reason,
The tip of the rising portion of the burring hole is pressed and fixed against the surface (portion A) extending from the base end of the tapered portion 2 to the first groove portion 4. Further, the annular projection 5 abuts on the inner circumferential wall (portion B) of the burring hole. Thereby, the grommet can be fixed to the panel with three-point support. At this time, the distance between the panel 11 and the grommet 10 is A in the figure.
Three points will be sealed in the areas indicated by B and C.

Furthermore, when this grommet 10 is attached to a punched hole type panel hole, the punched hole is fitted into the second groove 6. Since the second groove 6 has a smaller outer diameter than the first groove 4, the annular protrusion 5
It is easy to fall to the side and difficult to fall to the first groove part 4 side. For this reason,
The grommet 10 is easy to attach to the panel 11 and difficult to come off. Further, the tip of the flange portion 7 presses the panel 11 toward the tip of the grommet (portion E). Therefore, the peripheral edge of the punched hole is pressed and fixed against the inner surface (portion D) on the tip side of the second groove 6. Thereby, the grommet can be fixed to the panel with two-point support. At this time, the distance between the panel 11 and the grommet 10 is D and E in the figure.
Two points will be sealed in the area shown by .

[0012] As described above, the grommet according to this embodiment can be stably attached to either type of panel hole, punching type or burring type, and the workability during installation is also good. There is an advantage. In the above embodiment, since the first and second grooves 4 and 6 are formed in a rectangular shape, a high adhesion force can be obtained. However, in consideration of moldability etc., the shape of the grooves is
It may be formed in a letter shape.

[0013]

As described above, according to the present invention, the first groove, the annular protrusion, the second groove, and the collar are formed in this order on the proximal end side of the tapered portion, and The outer diameter of the end portion is made larger than the outer diameter of the annular projection, and the outer diameter of the first groove portion is made larger than the outer diameter of the second groove portion. It is stably fixed by the groove and the flange, and the burring type panel hole is stably fixed by the portion continuing from the proximal end of the tapered part to the first groove, the annular projection, and the flange. Therefore, according to the present invention, since it is applicable to both types of panel holes, punching type and burring type, it is possible to reduce the types of parts, reducing mold costs and product costs, and reducing parts costs. This has the effect of reducing management costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a grommet according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing the fitting part of the grommet in detail.

FIG. 3 is a partial sectional view showing how the grommet is attached to a burring hole.

FIG. 4 is a partial cross-sectional view showing how the grommet is attached to the punched hole.

FIG. 5 is a sectional view showing a burring type panel hole.

FIG. 6 is a cross-sectional view showing a punch-out type panel hole.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Wire bundle holding tube part, 2... Taper part, 3... Fitting part, 4...
1st groove, 5... annular projection, 6... second groove, 7... collar, 10... grommet, 11... panel.

Claims (1)

[Claims] Claim 1: A tapered part formed so that the outer diameter gradually increases from the distal end to the proximal end in the direction of insertion into the panel, and a tapered part formed at the proximal end of the tapered part to fit into a hole in the panel. The fitting portion includes a first groove formed on the proximal side of the tapered portion, an annular protrusion formed on the proximal side of the first groove, and a first groove formed on the proximal side of the tapered portion. The annular protrusion has a second groove formed on the proximal side, and a collar extending radially outward from the proximal side of the second groove and having a distal end edge folded back toward the distal side. , an outer diameter of the proximal end of the tapered portion is larger than an outer diameter of the annular protrusion, and an outer diameter of the second groove is smaller than an outer diameter of the first groove. grommet.