JPH0992063A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a grommet being facilitated fitting work to a fitting panel, and having sufficient fixing force to the fitting panel, by improving the shape of an insertion side tube part to be inserted into a fitting hole. SOLUTION: A grommet 3, having an insertion side tube part 2 to be inserted into a fitting hole 1, is formed of a long tube part 2a having the utmost long tube length of the tube part 2, and a short tube part 2b having the utmost short tube length; and the long tube parts 2a and short tube parts 2b are formed on a position, nearly opposite with each other, with the center axis 4 of the tube part 2 as a center. Consequently, the tip part 2c of the tube part 2 forms a shape like a bamboo cut obliquely. In this grommet 3, since a first insertion place (long tube part 2a) is sharpened, the insertion direction of the grommet 3 can be acknowledgable by feeling in case of inserting the grommet 3 into a fitting hole 1 by an operator. Next, the long tube part 2a, since it is sharpened, can be insertable with a sharpened portion as an insertion guide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet used for arranging a wire harness penetrating a mounting hole of a vehicle body or the like.

[0002]

2. Description of the Related Art A conventional grommet will be described below with reference to the drawings. FIG. 3 is a sectional view showing a mounted state of the conventional grommet 3, and FIG. 4 is a sectional view showing a state of mounting the conventional grommet. As shown in FIG. 3, in the conventional grommet 3, the cylinder length of the insertion side cylinder portion 2 (here, the shortest distance from the groove portion 6 fitted to the edge of the mounting hole 1 of the mounting panel 7 to the cylinder tip portion 2c). Is the same everywhere. Therefore, as shown in FIG. 4, when inserting the grommet 3 into the mounting hole 1 of the mounting panel 7, the entire distal end portion 2c of the insertion side tubular portion 2 is inserted into the mounting hole 1,
The edge of the mounting hole 1 contacts the outer periphery of the base portion 2d of the insertion-side tubular portion 2. Since the outer circumference of the base portion 2 is larger than the inner circumference of the mounting hole 1, the grommet 3 must be pushed in the insertion direction to elastically deform the insertion-side tubular portion 2 for mounting. After mounting the grommet 3, the base portion 2d is formed thick so that the grommet 3 does not easily come off the mounting hole 1.

[0003]

However, since this mounting work is performed manually without using a jig or the like, it has been a heavy labor for workers during mass production. For example, as shown in FIG. 4, when the grommet 3 is mounted in the mounting hole 1, the edge of the mounting hole 1 has a base portion 2 of the insertion side tubular portion 2.
Since there is contact over almost the entire circumference of d, the frictional force at the time of insertion is large, and it is difficult to mount.
Further, at the time of mounting, the insertion side tubular portion 2
If you try to insert it by inserting after tilting it, the amount of partial deformation of the grommet 3 will increase, and in the thick part,
Since it is a very difficult task, the force to insert the base 2
d must be added uniformly over almost the entire circumference,
There has also been a problem that the skill of the worker is required and the constraint is imposed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a grommet which can be easily mounted on a mounting panel and has a sufficient fixing force to the mounting panel. I am trying.

[0005]

The grommet of the present invention comprises:
A grommet having an insertion side tube portion to be inserted into the mounting hole, wherein the insertion side tube portion is formed with a longest tube length portion and a shortest tube short portion, and the tube length portion and the tube short portion are formed. It is characterized in that it is formed at a position substantially opposite to the center axis of the insertion side tubular portion.

To further explain the shape of the insertion-side cylinder portion having the above-mentioned characteristics, the insertion-side cylinder portion has a shape in which the tip portion is formed by cutting a bamboo diagonally. Therefore, the operator can insert the grommet after confirming the shape of the insertion side tube portion visually or by groping. In addition, depending on how to insert the insertion side tubular portion into the mounting hole, it becomes easier than in the conventional case.

In the grommet formed as described above, an arbitrary part of the groove portion continuously arranged on the outer periphery of the grommet is hooked on the edge of the mounting hole of the mounting panel,
The grommet can be mounted in the mounting hole by rotationally moving in a direction of inserting the grommet into the mounting hole, with the portion caught on the edge of the mounting hole serving as a fulcrum. This can reduce the mounting work.

[0008]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing a mounted state of a grommet 3 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a process of mounting the grommet according to the embodiment of the present invention. In these figures, the same parts as those in FIGS. 3 and 4 described above are designated by the same reference numerals. As shown in FIG. 1, 3 is a grommet, which is formed on a mounting panel 7 that is a part of the vehicle body panel (for example, a vehicle body panel that separates the engine room from the vehicle compartment, or a vehicle body panel on the opening / closing support side of the door). The attached state is shown so as to be in close contact with the attached mounting hole 1. Although not shown, the grommet 3 usually has a substantially circular (true circle, oval, elliptical, etc.) tubular shape, and a linear body such as a wire harness is penetrated. The grommet 3 is different from the conventional one in that the grommet 3 has an insertion side tube portion 2 to be inserted into the mounting hole 1 as shown in FIG. 1, and the insertion side tube portion 2 has the longest tube length. A grommet 3 formed with a portion 2a and a shortest cylinder short portion 2b, and the cylinder long portion 2a and the cylinder short portion 2b are substantially opposed to each other around the central axis 4 of the insertion side cylinder portion 2, that is, the insertion side. Tip part 2 of tube part 2
This is the point that c is shaped like a bamboo cut diagonally. In the grommet 3 configured as described above, when the operator inserts the grommet 3 into the mounting hole 1, since the first insertion portion (the cylinder long portion 2a) is sharp, the insertion direction of the grommet 3 can be searched for by hand. Easy to check. Next, the tube length portion 2a
Since the point is sharp, that part serves as an insertion guide and is easy to insert. Further, although not shown, the gap may be filled with a filler for the purpose of waterproofing, soundproofing, and dustproofing the gap between the wire harness or other linear member penetrating the grommet 3 and the through hole of the grommet 3. In order to wind the grommet 3 and the wire harness such as a wire harness with an adhesive tape, a certain length of cylinder is required. Therefore, at least a part of the insertion side tubular portion 2 has the longest tubular length 2a.
Are preferably formed.

When the shape is specifically described by the length of the cylinder, for example, the cylinder long portion 2a is about 20 mm and the cylinder short portion 2b is about 1.
When the length is 3 mm, the tip portions 2c of the both are formed by a straight line when viewed from the side. The size and the shape are not limited to the examples, and are designed according to the size and the shape of the mounting hole 1. Therefore, it is preferable that the cylinder long portion 2a and the cylinder short portion 2b are formed at positions facing each other around the central axis 4 of the insertion-side cylinder portion 2, but this is not necessarily the case, and the insertion-side cylinder portion 2 is not necessary. It may be formed in the range of the upper half and the lower half of an arbitrary surface that passes through the central axis 4. Although not shown, the distal end portion 2c of the insertion-side tubular portion 2 may be formed with a surface that is parallel to the surface of the mounting panel 7.

The grommet 3 which satisfies the following conditions
Since it is easy to attach the grommet 3 to the mounting hole 1, it will be described below with reference to FIG. First, a grommet 3 having an insertion side tubular portion 2 to be inserted into the mounting hole 1,
In the cut surface passing through the central axis 4 of the through hole of the grommet 3, A: a contact point caught on the edge of the mounting hole 1 arranged at a position facing the central axis 4 and the distal end portion 2c of the outer periphery of the insertion side tubular portion 2 B: inner diameter of the mounting hole 1, C: distance between the contact point caught on the edge of the mounting hole 1 arranged at a position facing the central axis 4 and the base 2d on the outer circumference of the insertion side tubular portion 2, When, the grommet 3 is formed so as to at least satisfy the relationship of A ≦ B <C.

First of all, the grommet 3 is first inserted only in the cylindrical portion 2a, and the groove portion 6 is hooked on the edge of the mounting hole 1 to be temporarily fixed. Next, when the grommet 3 is rotationally moved in the insertion direction with the temporarily fixed portion as a fulcrum to insert the tip 2c of the outer circumference of the short tube portion 2b into the mounting hole 1, the outer circumference of the short tube portion 2b contacts the edge of the mounting hole 1. To do. In order to perform this work smoothly, at least the relationship of A ≦ B must be satisfied. This is because the tip end portion 2c is caught in the mounting hole 1 when A> B. Next, the grommet 3 is further rotated and moved in the insertion direction so that the groove 6 is completely fitted to the edge of the mounting hole 1 and the mounting work is completed. At this time, B
With the grommet 3 that satisfies at least the relationship of <C, after the grommet 3 is mounted, the tubular short portion 2 is attached to the edge of the mounting hole 1.
Since b is hooked, it is possible to prevent the grommet 3 from coming off the mounting hole 1. Thus, A ≦ B <
Since the grommet 3 formed so as to at least satisfy the relationship of C is hooked (temporarily fixed) to the edge of the mounting hole 1 and then the grommet 3 is pushed in, the operator can easily position the grommet 3 at the time of insertion. It does not require skill and can be worked easily. Moreover, it is possible to reduce the labor at the time of mounting without using any jig or the like. Of course, as in the conventional case, the entire tip end portion 2c of the insertion side tubular portion is attached to the mounting hole 1
Alternatively, the groove portion 6 can be fitted into the edge of the mounting hole 1 by inserting the groove portion 6 into the mounting hole 1 at once.

The grommet 3 is made of rubber or a flexible resin, and at least the insertion side tube portion 2 and the collar portion 5 are formed.
And the tubular portion 8 are integrally formed. Further, if a groove portion 6 in which the edge of the mounting hole 1 is closely fitted is formed in the circumferential direction at a position adjacent to the insertion side tubular portion 2 and the flange portion 5, the close contact is increased, and the grommet 3 and the mounting hole 1 are connected. Waterproofing of contact parts,
It is preferable because it improves dustproofness and soundproofing. The outer shape of the insertion side tubular portion 2 is formed so that the outer peripheral length gradually decreases from the base portion 2d toward the tip portion 2c. That is,
It is preferable for mounting work to have a tapered tubular shape.

On the other hand, since the tubular portion 7 has at least the function of covering the linear member such as the wire harness penetrating the grommet 3, it has a small wall thickness as shown in FIGS. 1 and 2. The shape is preferably cylindrical but is not particularly limited.

[0014]

As described above, according to the grommet of the present invention, it is possible to provide the grommet which can be easily mounted on the mounting panel and has a sufficient fixing force to the mounting panel.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing a process of mounting the grommet according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a mounted state of a conventional grommet.

FIG. 4 is a cross-sectional view showing a process of mounting a conventional grommet.

[Explanation of symbols]

 1 Mounting Hole 2 Insert Side Tube 2a Tube Long Section 2b Tube Short Section 3 Grommet 4 Center Axis

Claims (1)

[Claims] 1. A grommet having an insertion side tube portion to be inserted into a mounting hole, wherein the insertion side tube portion is formed with a longest tube length portion and a shortest tube length portion, and the cylinder long portion. A grommet characterized in that the tubular short portion and the tubular short portion are formed at positions substantially opposite to each other around the central axis of the insertion side tubular portion.