JPH0817276A - Grommet - Google Patents

Abstract

PURPOSE:To provide a gromment which can be installed easily, and in which a complete installation condition can be provided securely by providing a recessed part for thinning thickness between a wire insertion part and a groove part to be engaged with an installation hole of a panel. CONSTITUTION:An installation grommet 1 is pushed into an installation hole 13 of a panel 11 from the side of a resilient swollen part 7. A taper outer surface part 23 is applied to the hole 13, and the circumference of a forward end 7a of the swollen part 7 is resiliently deformed toward the side of an insertion part 5 about a thin circular recessed part 19 between the wire insertion part 5 and a groove part 17. Simultaneously, the groove part 17 is opened largely, the grommet 1 is inserted sufficiently, and when a flange part 9 is applied to the panel 11, the swollen part 7 returns to an initial condition by resiliency, while engagement with the installation hole 13 is achieved securely. After a protruding part 21 and a lip part 27 are pushed to be applied to the panel 11, a side wall part of the swollen part 7 is applied to an end part of the installation hole 13, so the protruding part 21 is tightly applied to the installation hole 13 along the whole circumference to provide a sealing condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring grommet (hereinafter referred to as a grommet) which can be easily mounted on a vehicle panel or the like.

[0002]

2. Description of the Related Art A conventional grommet of this type is shown in FIGS. 3 and 4 (see Japanese Utility Model Laid-Open No. 61-193429).

As shown in FIG. 3, the grommet 41 is composed of an annular elastic member 43, a large diameter portion 45 and a small diameter portion 47 are formed on the outer peripheral side thereof, and is fixed to the boundary between the large diameter portion 45 and the small diameter portion 47. An annular groove 49 is formed. The outer peripheral side of the small diameter portion 47 is formed in a tapered shape so that the steel plate 51 can be easily attached to the attachment hole 53. Further, annular protrusions 55 and 57 are formed on the side walls of the large-diameter portion 45 and the small-diameter portion 47 facing the annular groove 49 so as to closely mount the steel plate 51. When the steel plate 51 is mounted in the annular groove 49, the protrusions 55 and 57 press the steel plate 51 from both sides, and the grommet 41 comes into close contact with the steel plate 51.

A plurality of slits 59 extending from the annular groove 49 along the radial direction are formed in the small diameter portion 47 over the entire circumference of the small diameter portion 47. The slit 59 facilitates elastic deformation of the small diameter portion 47, and the small diameter portion 47 partitioned by the slit 59 is sequentially inserted into the mounting hole 53 of the steel sheet 51, so that the grommet 41 can be inserted into the steel sheet 5 with low insertion force.
Can be attached to 1.

[0005]

However, in the grommet 41 shown in FIG. 3, since the small diameter portion 47 divided into the slit 59 is sequentially inserted into the mounting hole 53 of the steel plate 51, the mounting work on the steel plate 51 is complicated. there were.

Further, as shown in FIG. 4, a part 47a of the small-diameter portion 47 divided by the slit 59 has a mounting hole 5 for the steel plate 51.
Since the grommet 41 may be held by the steel plate 51 even when the grommet 41 is not completely penetrated,
It is difficult to confirm the mounting state of the grommet 41, and there is a risk that the grommet 41 may be used in an imperfectly mounted state.

The present invention has been made in view of the above-mentioned problems, and provides a grommet which can be easily mounted in a mounting hole of a panel with a low insertion force and can surely obtain a completely mounted state. It is an object.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 has a cylindrical grommet body having an electric wire insertion portion through which an electric wire is inserted, and bulges on the outer periphery of the grommet main body. Elastic bulging portion formed, a flange portion projecting from one end side of the elastic bulging portion, and a fitting hole of a panel formed between the flange portion and the elastic bulging portion. A groove portion that is inserted into the mounting hole from the side of the elastic bulge and is attached to the panel, a recess that thins the wall thickness between the wire insertion portion and the groove portion is formed. It is characterized in that it is provided in the section.

The invention according to claim 2 is the grommet according to claim 1, wherein the groove portion is formed in an annular shape outside the wire insertion portion, and the recess is formed in an annular shape on the back side of the groove portion. It is characterized by

A third aspect of the present invention is the grommet according to the first or second aspect, in which the groove is provided with a protrusion that is pressed against the mounting hole of the panel, and the bottom of the recess is the bottom. , Provided on the back side of the protrusion.

[0011]

According to the first aspect of the present invention, when the grommet is inserted into the mounting hole from the side of the elastic bulging portion for mounting on the panel,
The elastic bulging portion abuts against the mounting hole and is pressed. At this time,
The tip of the elastic bulge in the insertion direction is easily elastically deformed toward the wire insertion part side so that it bends around the concave part that thins the wall thickness between the wire insertion part and the groove part, and the groove part opens greatly to the mounting hole. Mated. That is, since the elastic bulging portion is easily elastically deformed, the grommet can be easily mounted with a low insertion force, and the groove portion is large opened, so that a sufficient fitting state between the mounting hole and the groove portion can be surely obtained. be able to.

Further, in the portion deviated from the bottom of the recess,
Since the wall thickness between the wire insertion portion and the groove can be formed thick, the holding force of the grommet with respect to the panel can be maintained high.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, since the recess is formed in an annular shape, the elastic bulging portion is easily elastically deformed over the entire circumference. Therefore, the grommet can be easily and surely attached with a lower insertion force.

According to the invention of claim 3, in addition to the operation of the invention of claim 1 or claim 2, since the bottom of the recess is provided on the back side of the projection, the thinnest portion of the bottom is formed by the projection. Reinforced, the holding force of the grommet with respect to the panel can be further enhanced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

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

As shown in FIG. 1, the grommet body 3 of the grommet 1 is formed of an elastic rubber material or the like into a cylindrical body, and has a wire insertion portion 5 in the form of a through hole into which a wire harness (electric wire) W is inserted. are doing. A hollow elastic bulging portion 7 is bulged and formed on the outer periphery of the grommet body 3, and a flange portion 9 is projectingly provided on one end side of the elastic bulging portion 7. Between the flange portion 9 and the elastic bulge portion 7, the vehicle panel 1 is provided.
A groove portion 17 having an opening formed outside is formed so as to fit into the mounting hole 13 formed by burring processing or the like on the first portion. The groove portion 17 is formed in an annular shape outside the electric wire insertion portion 5 so as to be aligned with the attachment hole 13, and the annular protrusion 2 that is pressed against the attachment hole 13 of the panel 11 is provided substantially at the center of the groove portion 17.
1 is provided. The elastic bulging portion 7 includes a tapered outer surface portion 23 whose diameter decreases from the groove portion 17 side toward the opposite flange portion side, and the outer diameter of the flange portion 9 is the tapered outer surface portion 23.
Is formed larger than the maximum diameter.

The electric wire insertion portion 5 on the back side of the groove portion 17 is provided with a concave portion 19 for thinning the wall thickness between the electric wire insertion portion 5 and the groove portion 17, and the concave portion 19 is formed in an annular shape on the back side of the groove portion 17. There is. The bottommost portion 19a of the recess 19 is provided on the back side of the protrusion 21, and both sides of the bottommost portion 19a are connected to the wire insertion portion 5 with a gentle inclination. The wall thickness between the wire insertion portion 5 and the groove portion 17 is formed such that it is thickest at both ends 17a and 17b of the groove portion 17 (D _{1 in the} drawing) and thinnest at the bottom portion 19a (D _{2 in the} drawing). There is.

The groove portion 17 of the flange portion 9 has a side wall surface 9a.
An annular lip portion 27 that is pressed against the panel 11 is provided at the outermost portion of the.

When mounting the grommet 1 in the mounting hole 13 of the panel 11, the grommet 1 is inserted into the mounting hole 13 of the panel 11 from the elastic bulging portion 7 side and pushed in, as shown in FIG. When the grommet 1 is inserted, the tapered outer surface portion 23 comes into contact with the mounting hole 13 and the elastic bulging portion 7 is pressed. At this time, as shown in FIG.
The entire circumference of the tip end 7a in the insertion direction of the electric wire insertion portion 5 and the groove portion 17
Around the annular recessed portion 19 that reduces the wall thickness between them, elastic deformation is easily performed so as to bend toward the wire insertion portion 5 side.
Since the concave portion 19 which is the center of bending is on the back side of the groove portion 17, even if the elastic bulging portion 7 is slightly bent, the groove portion 17 is largely opened (opening amount L1). When the insertion amount of the grommet 1 reaches a predetermined amount, the elastic bulging portion 7 returns to the side opposite to the electric wire insertion portion due to the elastic force, and the protrusion 21 and the lip portion 27 are pressed against the panel 11, and then, as shown in FIG. ), The elastic bulging portion 7 is completely returned to the initial state, the side wall portion 7b of the elastic bulging portion 7 on the groove portion 17 side is pressed against the end portion 13a of the mounting hole 13, and the groove portion 17 is It is fitted into the mounting hole 13.

On the other hand, the grommet 31 without the recess 19 as shown by the chain double-dashed line in FIGS. 2 (a) and 2 (b).
Then, with the insertion into the attachment hole 13, the elastic bulging portion 7 bends around the electric wire insertion portion 5 side of the flange portion 9.
Therefore, as compared with the grommet 1 having the recess 19, the elastic bulging portion 7 is less likely to be deformed, and a large insertion force is required,
Moreover, since the bending center is separated from the groove portion 17, the opening amount L2 of the groove portion 17 with respect to the displacement amount of the tip of the elastic bulging portion 7 becomes small. Therefore, the upper end of the side wall portion 7b of the elastic bulging portion 7 is easily caught on the end portion 13a of the mounting hole 13, and the grommet 31
The installation work of is complicated. Further, after the lip portion 27 is pressed against the panel 11, the elastic bulging portion 7 returns to the initial state, and the side wall portion 7b and the protrusion 21 of the elastic bulging portion 7 are pressed against the panel 11 almost at the same time. The protrusion 21 and the mounting hole 13
There is a risk that the grommet 31 will be held by the panel 11 while the contact state between the and is not reliable over the entire circumference.

On the other hand, in the grommet 1 having the annular recess 19, the elastic bulging portion 7 is easily elastically deformed over the entire circumference as described above, so that the grommet 1 can be easily mounted with a low insertion force. Moreover, since the groove portion 17 is largely opened, it is possible to reliably obtain a sufficient fitting state between the mounting hole 13 and the groove portion 17. Also, the protrusion 21 and the lip 27
Since the side wall portion 7b of the elastic bulging portion 7 is pressed against the end portion 13a of the mounting hole 13 after being pressed against the panel 11, the projection 21 is reliably pressed against the mounting hole 13 over the entire circumference. A completely sealed state can be obtained between the mounting hole 13 and the groove portion 17.

Further, since the thickness D1 between the wire insertion portion 5 and the groove portion 17 is formed thick at both ends 17a and 17b of the groove portion 17, the holding force of the grommet 1 with respect to the panel 11 can be maintained high. Further, since the bottommost portion 19a of the concave portion 19 is provided on the back side of the protrusion 21, the bottommost portion 19a
The thinnest portion of the grommet 1 is reinforced by the protrusion 21, and the holding force of the grommet 1 with respect to the panel 11 can be further enhanced.

[0024]

As described above, according to the first aspect of the present invention, since the elastic bulging portion is easily elastically deformed by the concave portion and the groove portion is largely opened, the grommet can be easily inserted with a low insertion force. And it can be mounted securely. In addition, since the wall thickness between the wire insertion portion and the groove portion can be formed thicker at the portion deviated from the bottommost portion of the recess, the grommet holding force for the panel can be maintained high.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the elastic bulging portion is easily elastically deformed over the entire circumference by the annular concave portion, the grommet can be inserted with a lower insertion force. It can be installed easily and securely.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, since the thinnest portion at the bottom is reinforced by the protrusion, the holding force of the grommet with respect to the panel is increased. It can be further increased.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a grommet according to an embodiment of the present invention.

2A and 2B are operation explanatory views showing a mounted state of the grommet of FIG. 1, in which FIG. 2A shows the mounting start, FIG. 2B shows the mounting in progress, and FIG.

FIG. 3 is a sectional view of a main part of a conventional grommet.

FIG. 4 is a front view showing a conventional grommet.

[Explanation of symbols]

 1 Grommet 3 Grommet main body 5 Electric wire insertion portion 7 Elastic bulging portion 9 Flange portion 11 Panel 13 Mounting hole 17 Groove portion 19 Recessed portion 21 Projection portion W Wire harness (electric wire)

Claims (3)

[Claims] 1. A cylindrical grommet body having an electric wire insertion portion through which an electric wire is inserted, an elastic bulging portion formed by bulging on the outer periphery of the grommet main body, and one end side of the elastic bulging portion. A protruding flange portion; and a groove portion fitted into a mounting hole of the panel formed between the flange portion and the elastic bulging portion, and from the elastic bulging portion side into the mounting hole. The grommet inserted and attached to the said panel WHEREIN: The recess which reduces the wall thickness between the said electric wire insertion part and the said groove part was provided in the said electric wire insertion part. 2. The grommet according to claim 1, wherein the groove is formed annularly outside the wire insertion portion, and the recess is formed annularly on the back side of the groove. . 3. The grommet according to claim 1 or 2, wherein the groove is provided with a protrusion that is pressed against the mounting hole of the panel, and the bottom of the recess is the back side of the protrusion. Grommet characterized by being provided in.