JPH1089544A - Soundproofing grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the effect of sound insulation by obtaining a soundproofing grommet capable of sound-insulating cavity part of a penetration hole part of the grommet. SOLUTION: With the soundproofing grommet 31, a sound insulating body 41 having a wire-penetrating hole 39 is elastically pressure-fitted into an large opening part 33 of a grommet body 33 formed by connecting the large opening part 33 with a small opening part 35 in series. In this case, a sound insulating layers 49 made of hard material are formed in a nearly intermediate position of the sound insulating body 41, both end sides of which are formed of sound insulating material 47 made of soft material, and a claw part for engagingly locking the sound insulating layers 49 are provided on the inner peripheral surface of the large opening part 33. By engagingly locking the sound insulating layers 49 by means of the claw part, the sound insulating body 41 is held in the large opening part 33 with the one end side-sound insulating material 47 being projected from the large opening part 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulating grommet provided with a sound insulating material, and more particularly to an improvement in a sound insulating structure and a sound insulating material holding structure.

[0002]

2. Description of the Related Art In a moving vehicle such as an automobile, a grommet is used to hold an electric wire through a panel or the like. At this time, if the panel separates the cabin from the engine room or wheel house where noise is generated, the grommet has a soundproofing function to prevent noise from leaking into the cabin through the grommet mounting opening. It is necessary to have. An example of such a grommet having a soundproofing function, in which a sound insulating material is press-fitted into a grommet body, will be described with reference to FIGS.

FIG. 9 is an exploded perspective view of a conventional soundproof grommet, and FIG. 10 is a sectional view showing a state where the soundproof grommet shown in FIG. 9 is attached to a panel. This soundproof grommet 1
Are made of an elastic material such as rubber, and the large opening 3 and the small opening 5
And a sound insulator 11 having a wire through hole 9 in the center. The sound insulating body 11 is formed by attaching a sound insulating layer 15 made of a hard material such as vinyl chloride to an end face of a sound insulating material 13 made of a soft material such as a sponge material. The soundproof grommet 1 elastically press-fits the sound insulating body 11 into which the electric wire 17 has been inserted into the large opening 3 into the grommet main body 7 into which the electric wire 17 has been inserted.
The sound insulating body 11 is held inside the grommet body 7 by locking the claw portion 19 provided on the inner periphery of the sound insulating layer 15 outside.

The soundproof grommet 1 has a holding groove 21 formed on the outer periphery of the large opening 3 inserted into a mounting opening 25 of the body panel 23 so that the electric wire 17 is attached to the body panel 23.
Is held through. A vehicle interior panel 26 is provided on the vehicle interior side of the body panel 23, and a silencer (sound insulating material) 27 is inserted between the vehicle interior panel 26 and the body panel 23 except for the mounting opening 25. . According to the soundproof grommet 1 configured as described above, the sound insulating material 1 in which the noise that is going to pass through the mounting opening 25 is pressed into the grommet main body 7.
3 and the sound insulation effect in the vehicle interior could be enhanced.

[0005]

However, in the conventional soundproof grommet 1 described above, the sound insulating body 11 is press-fitted into the grommet main body 7 and the grommet main body 7 is mounted in the mounting opening 25 to close the mounting opening 25. Although the mounting opening 25 can be sound-insulated, the body panel 2
A grommet through-hole portion (portion where the silencer 27 is not inserted) between the vehicle body panel 3 and the vehicle interior panel 26 is a hollow portion 29.
Therefore, there is a problem that the noise passing through the body panel 23 passes through the hollow portion 29 along the route indicated by the dashed arrow shown in FIG. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a soundproof grommet capable of insulating a hollow portion of a grommet through-hole portion, and to improve a sound insulating effect.

[0006]

A soundproof grommet according to the present invention for attaining the above object has a funnel-shaped grommet body having a large opening and a small opening connected to the large opening.
In a soundproof grommet for elastically press-fitting a sound insulator having an electric wire through-hole, a sound insulation layer made of a hard material is formed at a substantially intermediate position between the sound insulators formed at both ends with a sound insulation material made of a soft material, A claw portion for locking the sound insulation layer is provided on the inner peripheral surface of the large opening, and the sound insulation material at one end side is projected from the large opening by locking the sound insulation layer with the claw portion. The sound insulating body is held in the large opening. The soundproof grommet is preferably provided with another soundproofing layer in addition to the soundproofing layer at the substantially intermediate position on the distal end surface of the soundproofing material protruding from the large opening. Also,
It is preferable that the sound insulator is formed by forming a cut in the radial direction and at both ends to open the electric wire through hole. The soundproof grommet is formed by connecting a plurality of layers having different outer diameters to form the sound insulating body, and forming a small outer diameter layer forming a groove for inserting and locking the claw portion at a substantially intermediate position of the sound insulating body. In addition, the outer diameter of the layer protruding from the large opening may be equal to or larger than the outer diameter of the large opening. Further, the plurality of layers may be formed by the sound insulating material and the sound insulating layer.

In this soundproof grommet, a hard soundproof layer is provided in the middle of the soundproof body, and the soundproof layer is locked by claws, thereby increasing the holding power of the soundproof body. In addition, the sound insulating material at one end of the sound insulating body protrudes from the grommet body, and when the grommet body is attached to the body panel, the protruding sound insulating material presses against the cabin panel, so that the hollow portion of the grommet through-hole portion becomes the sound insulating material. Will be closed. In the case where a hard sound insulation layer is provided on the front end surface of the sound insulation material protruding from the large opening, the soft sound insulation material comes into pressure contact with the vehicle interior panel through the hard sound insulation layer, and the sound insulation material becomes a vehicle. The deformation that protrudes from the opening of the room panel is eliminated. In addition, in the sound insulator where the notch is formed,
The electric wire through hole is opened, and the work of inserting the sound insulator into the electric wire becomes easy. Further, in a soundproof grommet in which a plurality of layers having different outer diameters are continuously formed to form a sound insulating body, a groove into which a claw portion is inserted is formed, so that locking by the claw portion can be reliably performed in a large locking area. In addition, by making the layer protruding from the large opening the outermost diameter, the gap between the sound insulating material and the silencer in the cavity becomes small.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a soundproof grommet according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a soundproof grommet according to the present invention,
2 is a cross-sectional view of the soundproof grommet shown in FIG. 1 in an assembled state, FIG. 3 is an enlarged view of a claw portion shown in FIG. 2, and FIG. 4 is a cross section of the soundproof grommet shown in FIG. FIG. Note that the same members as those shown in FIGS. 9 and 10 are denoted by the same reference numerals, and redundant description will be omitted. The soundproof grommet 31 is made of an elastic material such as rubber and has a grommet main body 37 formed by connecting a large opening 33 and a small opening 35 to form a funnel, and a cylindrical sound insulating body having a wire through hole 39 in the center. 41.

The large opening 33 of the grommet main body 37 is formed thicker than the small opening 35.
An annular holding groove 43 is formed in the circumferential direction on the outer circumference of the. The holding groove 43 is engaged with an edge of the mounting opening 25 formed in the body panel 23. That is, the grommet body 3
7 is penetrated and held by the body panel 23 by engaging the holding groove 43 with the edge of the mounting opening 25. Large opening 33
A claw portion 45 is provided on the inner periphery of the sound insulating body 4.
1 is a locking means.

The sound insulating member 41 is formed by alternately attaching a pair of sound insulating members 47 and a pair of disk-shaped sound insulating layers 49 having the same outer diameter as the sound insulating members. In addition, the sound insulation body 41 may be one in which both ends are formed of the sound insulation material 47 and the sound insulation layer 49 is formed therebetween. The sound insulating layer 49 sandwiched between the pair of sound insulating materials 47 is joined to the sound insulating body 41 at a distance of a fixed radius from the center. That is, the vicinity of the outer periphery of the sound insulating material 47 and the sound insulating layer 49 are in contact without being joined. The sound insulating material 47 is made of a soft material such as a sponge material, and the sound insulating layer 49 is made of a hard material such as vinyl chloride.

The sound insulator 41 has an outer diameter of the grommet body 37.
Is formed slightly larger than the inner diameter of the large opening 33. Therefore, the sound insulating body 41 is elastically pressed into the large opening 33 of the grommet body 37. Large opening 3
3 is a sound insulation layer 49 located in the middle layer.
The claw portion 45 is adapted to be locked. The claw portion 45 is
Since the sound insulating material 47 and the vicinity of the outer periphery of the sound insulating layer 49 are not joined but are in contact with each other, the sound insulating material 47 is engaged with the surface of the sound insulating layer 49 while being cut into the sound insulating material 47 as shown in FIG. As a result, the sound insulator 41 is held by the grommet body 37.

The sound insulator 4 held by the grommet body 37
1 is that the pair of sound insulation materials 47 and the sound insulation layer 49 are formed in the large opening 33.
It is designed to protrude from. The projecting dimension of the sound insulator 41 from the grommet body 37 is set such that the distance x from the holding groove 43 to the tip of the sound insulator 41 is larger than the gap dimension z between the body panel 23 and the vehicle interior panel 26. .

The sound insulator 41 may be formed with a cut 51 in the radial direction and over both ends.
In the sound insulating body 41 having such a cut 51, the electric wire through hole 39 is opened, and the electric wire 17 can be inserted into the electric wire 17 at an arbitrary position without inserting the electric wire end into the electric wire through hole 39. In particular, the workability of inserting the wire into the long wire 17 can be improved.

The operation of the thus constructed soundproof grommet 31 will be described. The soundproof grommet 31 press-fits the sound insulator 41 into which the electric wire 17 has been inserted into the grommet body 37 into which the electric wire 17 has been inserted. The sound insulating body 41 press-fitted into the large opening 33 of the grommet main body 37 is held by the grommet main body 37 with a high holding force because the hard sound insulating layer 49 is engaged with the claw 45.

A soundproof grommet 31 holding a sound insulator 41
The holding groove 43 is provided in the mounting opening 25 of the soundproof grommet 31.
Attach by engaging. In the soundproof grommet 31 attached to the attachment opening 25, the sound insulation material 47 and the sound insulation layer 49 protruding from the large opening 33 are provided between the body panel 23 and the vehicle interior panel 26 through the grommet through hole portion (the silencer 27 is sandwiched). Part), that is, the cavity 2
9 is inserted. The distance x from the holding groove 43 to the tip of the sound insulating body 41 is equal to the distance between the body panel 23 and the passenger compartment panel 2.
Since it is larger than the gap distance z with respect to 6, the sound insulating material 47 protruding from the large opening 33 comes into pressure contact with the vehicle interior panel 26 via the sound insulating layer 49 at the end.

As a result, the cavity 29 in the grommet through hole portion is closed by the sound insulating material 47, so that noise passing through the body panel 23 does not pass through the cavity 29 and enter the vehicle interior.

Further, in the soundproof grommet 31 according to this embodiment, the hard soundproof layer 49 is provided on the end face of the soundproof material 47 protruding from the large opening portion 33, so that the soft soundproof material 47 replaces the hard soundproof layer 49. Through the opening 26a of the vehicle interior panel 26, and the soft sound insulating material 47 is supported by the opening 26a without being deformed (for example, deformed such that a part thereof protrudes from the opening 26a to the vehicle interior side). Become.

As described above, according to the above-described soundproof grommet 31, since the hard soundproof layer 49 is provided in the middle part of the soundproof body 41, the soundproof layer 49 is locked by the claw 45,
The sound insulator 41 can be held by the grommet body 37 with a high holding force. And the sound insulator 41 has a multilayer structure,
The sound insulating material 47 at one end is connected to the large opening 33 of the grommet body 37.
When the grommet body 37 is attached to the body panel 23, the protruding tip of the sound insulating material 47 can be pressed against the vehicle interior panel 26 to close the cavity 29. As a result, it is possible to block noise that is going to enter the vehicle interior through the hollow portion 29, and it is possible to improve the sound insulation effect.

The sound insulating material 4 protruding from the large opening 33
Since the hard sound insulating layer 49 is provided on the end face of the base 7, the soft sound insulating material 47 can be pressed against the opening 26 a without deforming the sound insulating material 47, so that an appropriate compressing action can be obtained and the sound insulating property can be ensured. The breakage of the sound insulating material 47 due to the protrusion deformation can also be prevented. Furthermore, since the sound insulating body 41 can be locked only by the hard sound insulating layer 49 without providing a special locking groove or the like, the locking structure can be formed at low cost. In addition, each of the sound insulators 41 includes a pair of
Also, by making the pair of sound insulation layers 49 have the same shape, the manufacturing cost can be reduced.

Next, another embodiment of the soundproof grommet according to the present invention will be described with reference to FIGS. FIG. 5 is an exploded perspective view of a soundproof grommet according to another embodiment, and FIG.
7 is an enlarged view of the claw portion shown in FIG. 6 in an assembled state of the soundproof grommet shown in FIG. 6, and FIG. 8 is a sectional view showing a state where the soundproof grommet shown in FIG. 6 is attached to a panel.

The soundproof grommet 61 according to this embodiment
Uses a grommet body 37 similar to the above-described soundproof grommet 31. Therefore, each part of the grommet main body 37 is given the same reference numeral, and duplicate description will be omitted. On the other hand, the sound insulator 63 includes a first layer 65, a second layer 67, and a third layer 69 having different outer diameters. Each layer 65, 67, 69
Is formed by a sound insulating material 47 and a sound insulating layer 49, and the sound insulating material 47 and the sound insulating layer 49 are arranged so as to be alternated.

The outer diameters of the layers 65, 67, 69 and the large opening 33 have a predetermined magnitude relationship, and the grommet body 3
7, the outer diameter of the first layer 65 on one end side which is press-fitted into the large opening 33 of No. 7 is a, the outer diameter of the intermediate second layer 67 is b, and the outer diameter of the third layer 69 on the other end is c. Assuming that the outer diameter of the large opening 33 is D, each outer diameter is set to a value satisfying b <a <D ≦ c.

The outer diameter of the first layer 65 is slightly larger than the inner diameter of the large opening 33 of the grommet main body 37. Therefore, the sound insulating body 63 is elastically pressed into the large opening 33 of the grommet main body 37. As shown in FIG. 7, the sound insulating body 63 includes a first layer 65.
A groove 71 is formed between the first layer 65 and the third layer 69, and the claw 45 inserted into the groove 71 is retained by the grommet body 37 by engaging with the sound insulation layer 49 of the first layer 65.

The sound insulator 6 held by the grommet body 37
In 3, the sound insulating material 47 of the third layer 69 and the sound insulating layer 49 project from the large opening 33. This sound insulator 63
Is set so that the distance x from the holding groove 43 to the tip of the sound insulating body 63 is larger than the gap z between the body panel 23 and the vehicle interior panel 26.

The sound insulator 63 may be formed with cuts 51 in the radial direction and at both ends in the same manner as the sound insulator 41 described above. Workability can be improved.

The operation of the thus constructed soundproof grommet 61 will be described. The sound insulating body 63 press-fitted into the large opening 33 of the grommet body 37 has the claw 45 inserted into the groove 71 and the hard sound insulation layer 49 is engaged with the claw 45, so that the grommet 63 has a high holding force. It is held by the main body 37.

The sound-insulating grommet 61 attached to the attachment opening 25 has a sound-insulating material 47 and a sound-insulating layer 49 of a third layer 69 protruding from the large opening 33 and a cavity 29 between the body panel 23 and the vehicle interior panel 26. Is inserted into. Since the distance x from the holding groove 43 to the tip end of the sound insulating body 63 is larger than the gap distance z between the body panel 23 and the vehicle interior panel 26, the sound insulating material 47 protruding from the large opening 33 has the sound insulation at the end. It comes into pressure contact with the passenger compartment panel 26 via the layer 49.

As a result, the cavity 29 in the grommet through-hole portion is closed by the sound insulating material 47, so that noise passing through the body panel 23 does not pass through the cavity 29 and enter the vehicle interior. Further, in the soundproof grommet 61, since the outer diameter c of the third layer 69 is equal to or larger than the outer diameter D of the large opening 33, the cavity 2
9 is further reduced as compared with the case of the soundproof grommet 31 in the soundproof grommet 31, so that the sound insulation effect is increased accordingly.

Also in the soundproof grommet 61 according to this embodiment, the hard sound insulation layer 49 is provided on the end face of the sound insulation material 47 of the third layer 69, so that the soft sound insulation material 47 is interposed via the hard sound insulation layer 49. Opening 26a of the cabin panel 26
, And the deformation of the soft sound insulating material 47 is prevented.

As described above, according to the above-described soundproof grommet 61, the first layer 65, the second layer 67, and the third layer 69 having different outer diameters are continuously provided to form the sound insulating body 63, and the second layer 67 is formed. Of the first layer 65 and the third layer 69 are smaller than the outer diameters a and c of the third layer 69, and the above-described soundproof grommet is formed by inserting and locking the claw portion 45 in the groove 71. It is possible to hold the sound insulating body 63 with a holding force higher than that of the sound insulating body 31 and prevent the sound insulating body 63 from coming off due to deformation of the grommet main body 37 when the body panel is inserted.

Then, the outer diameter c of the third layer 69 is set to the large opening 3
3, the gap between the sound insulating material 47 and the silencer 27 in the hollow portion 29 can be reduced, and the sound insulating body 41 formed with the same outer diameter can be reduced.
The sound insulation effect can be further enhanced as compared to

Since the sound insulator 63 has a multilayer structure,
The outer diameter of the third layer 69 can be changed according to the size of the hole of the silencer 27, so that an optimal sound insulation effect can be obtained for the body and the silencer 27 of various specifications having different dimensions.

[0033]

As described above in detail, according to the soundproof grommet according to the present invention, a hard soundproof layer is provided in the middle part of the soundproof body. The sound insulating body can be held by the grommet body with a high holding force. In addition, since the sound insulator at one end of the sound insulator protrudes from the grommet body, when the grommet body is attached to the body panel, the protruding sound insulator can be pressed against the vehicle interior panel to close the cavity, and the cavity can be closed. It is possible to cut off noise that is about to enter the interior of the vehicle and improve the sound insulation effect. If a sound-insulating layer is provided on the end surface of the sound-insulating material that protrudes from the large opening, an appropriate compression action can be obtained to ensure sound insulation and prevent damage to the sound-insulating material due to protrusion deformation. can do. In addition, if a cut is formed in the sound insulator, the electric wire through hole is opened, and the workability of inserting the sound insulator into a long electric wire can be particularly improved. Furthermore, according to the soundproof grommet in which the soundproof body is formed by connecting a plurality of layers having different outer diameters, the soundproof body can be held with a high holding force by inserting and locking the claw portion in the groove. The gap between the sound insulating material and the silencer in the cavity can be reduced by the large outer diameter layer protruding from the large opening, and the sound insulating effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a soundproof grommet according to the present invention.

FIG. 2 is a sectional view of the soundproof grommet shown in FIG. 1 in an assembled state.

FIG. 3 is an enlarged view of a claw portion shown in FIG. 2;

FIG. 4 is a sectional view showing a state where the soundproof grommet shown in FIG. 2 is attached to a panel.

FIG. 5 is an exploded perspective view of a soundproof grommet according to another embodiment.

6 is a sectional view of the soundproof grommet shown in FIG. 5 in an assembled state.

FIG. 7 is an enlarged view of a claw portion shown in FIG. 6;

8 is a cross-sectional view showing a state where the soundproof grommet shown in FIG. 6 is attached to a panel.

FIG. 9 is an exploded perspective view of a conventional soundproof grommet.

FIG. 10 is a sectional view showing a state where the soundproof grommet shown in FIG. 9 is attached to a panel.

[Explanation of symbols]

 31, 61 Soundproof grommet 33 Large opening 35 Small opening 37 Grommet main body 39 Wire through hole 41, 63 Sound insulator 45 Claw 47 Sound insulation material 49 Sound insulation layer 51 Cut 65, 67, 69 layer 71 groove

Claims (5)

[Claims] 1. A soundproof grommet in which a sound insulator having an electric wire through hole is elastically press-fitted into the large opening of a funnel-shaped grommet body having a large opening and a small opening. A sound insulation layer made of a hard material is formed at a substantially intermediate position of the sound insulation body having both ends formed of the sound insulation material, and a claw portion for locking the sound insulation layer is provided on an inner peripheral surface of the large opening; A soundproof grommet, wherein the sound insulating body is held in the large opening while the sound insulating material at one end is projected from the large opening by locking the sound insulating layer at a portion. 2. The sound-insulating grommet according to claim 1, wherein another sound-insulating layer is provided in addition to the sound-insulating layer at the substantially middle position on a front end surface of the sound-insulating material protruding from the large opening. 3. The sound-insulating grommet according to claim 1, wherein the sound-insulating body is formed by forming a cut in a radial direction and at both ends to open the electric wire through hole. 4. The sound insulating body is formed by connecting a plurality of layers having different outer diameters in succession, and a layer having a small outer diameter forming a groove for inserting and locking the claw portion is provided at a substantially intermediate position of the sound insulating body. While forming
The soundproof grommet according to claim 1, wherein an outer diameter of the layer protruding from the large opening is formed to be equal to or larger than an outer diameter of the large opening. 5. The soundproof grommet according to claim 4, wherein each of the plurality of layers is formed by the sound insulating material and the sound insulating layer.