JPH0533415U - Grommet - Google Patents

Abstract

(57) [Abstract] [Purpose] A single grommet can be used for multiple specifications with different thicknesses of the wall and sound insulation members to reduce cost and eliminate gaps, thus providing sound insulation performance. Can be improved. [Structure] In the grommet 20, through-holes 3 and 4 capable of supporting the linear body 2 are formed at both end portions 5 and 6, and the both end portions 5 and
A space between 6 is formed into a hollow shape 8 that forms a plurality of bellows-like portions 7 that can expand and contract in the longitudinal direction, and a recess 10 that can be fitted into a wall 9 is formed at one end 5 of the bellows-like portion 7. Protrusions 22 and 23 capable of sandwiching the sound insulating member 11 supported by the wall portion 9 are formed on the protruding portions 21 facing each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a grommet supported by a wall portion for separating noise or heat, such as a wall portion separating an engine room of a vehicle such as an automobile or an outer wall portion of a house.

[0002]

[Prior Art]

 As a technique of this kind, for example, as shown in FIG. 6 (see Japanese Utility Model Laid-Open No. 53-55800), the grommet 1 has through holes 3 and 4 capable of supporting a linear body 2 such as a harness or a hose. Formed in the parts 5 and 6 and between the both ends 5 and 6 is a hollow 8 forming a plurality of bellows-like parts 7. The engine room ER and the room PR are provided in the middle part 5a on the one end part 5 side. A recessed portion 10 that can be fitted into the separating wall portion 9 is formed, and at the other end portion 6, a flange portion 12 that can sandwich the sound insulation member 11 supported on the indoor PR side of the wall portion 9 in the wall portion 9 is formed. It becomes. The sound insulation member 11 is composed of a sound absorption member 13 such as a felt material and a sound insulation member 14 impregnated with coal tar or the like.

[0003]

[Problems to be solved by the device]

 However, if the thickness of the sound insulation member 11 is different depending on the specifications, the same grommet 1 cannot be used, and it is necessary to prepare another grommet in which the sizes of the intermediate portion 5a and the collar portion 12 are matched. After all, many grommets 1 with different shapes must be prepared, which causes a cost increase. Further, if the grommet 1 having a different shape is forcibly adopted, a gap is generated, so that the passing noise cannot be prevented and the noise level does not decrease.

The present invention has been made in view of the above points, and an object of the present invention is to allow a single grommet to meet various specifications in which the wall portion and the supporting member have different thicknesses. By doing so, it is possible to reduce the cost and to improve the sound insulation and heat insulation performance by eliminating the gap.

[0005]

[Means for Solving the Problems]

 In the grommet of the present invention, through holes capable of supporting a linear body are formed at both ends, and a space between the both ends is formed into a hollow shape having a plurality of bellows-like portions that can expand and contract in the longitudinal direction. A recess that can be fitted into the wall is formed at one end, and projections that face the bellows are formed so as to sandwich the support members supported by the wall. Characterize.

[0006]

[Work]

 According to this structure, even if the wall portion and the support member have different thicknesses, the support member is sandwiched by the projecting portion of any of the plurality of bellows portions, so that only one grommet is required and the sound insulation / heat insulation performance is improved. The cost is reduced and the sound insulation / heat insulation performance is improved because it does not impair.

[0007]

【Example】

 1 is a sectional view of a grommet according to a first embodiment of the present invention after being assembled to a wall portion and a supporting member, and FIG. 2 is a partial sectional view of the grommet unit of FIG. The same members as those in FIG. 6 are denoted by the same reference numerals, and duplicated description will be omitted.

In the figure, reference numeral 20 denotes a grommet of the present invention. The grommet 20 has through holes 3 and 4 capable of supporting a linear body 2 such as a harness and a hose at both ends 5 and 6 and both ends thereof. A space between 5 and 6 is formed into a hollow shape 8 that forms a plurality of bellows-like portions 7 that can expand and contract in the longitudinal direction (the direction indicated by the arrow in FIG. 1), and one end portion 5 of which can be fitted with a wall portion 9. And the protrusions 21 and 21 of the bellows-shaped portion 7 facing each other are formed with protrusions 22 and 23 capable of holding the sound insulation member 11 as a support member supported by the wall portion 9, respectively. It will be done.

Therefore, as shown in FIG. 1, the blocking member 14 of the sound insulating member 11 is sandwiched between the protrusion 22 and the protrusion 23 of the grommet 20. Therefore, since the wall portion 9 is engaged with the recess 10 for sound insulation and the projections 22 and 23 form a circumference, there is no gap with the shut-off member 14 and double sound insulation is possible. When the plate thickness is thicker than that of the example shown in FIG. 1, the adjacent projections 22 and 23 sandwich the blocking member 14.

FIG. 3 shows a grommet according to a second embodiment of the present invention. This grommet 30 is different from the above grommet 20 mainly in that the holding portion is further provided on the side of the through hole 4 of the other end 6. It is a point that 31 is extended and formed so as to be pressed against the linear body 2. With this configuration, when the linear body 2 is pulled out to be removed, the grommet 20 is also pulled out, so that workability is improved. In addition, at all times, the holding portion 31 further insulates the sound of the first embodiment and enables triple sealing.

FIG. 4 is a grommet according to a third embodiment of the present invention. This grommet 40 is different from the above grommet 30 mainly in that the other end 6 is formed on the through hole 4 side. This is that an extension portion 41 having a plate thickness equivalent to that of the grommet 40 is formed further on the indoor side PR side than the holding portion 31. With such a structure, the extension portion 41 can be simultaneously pulled out together with the linear body 2 by hand. At the free end of the extension part 41, a second holding part 42 similar to the holding part 31 is formed.

FIG. 5 shows a grommet according to a fourth embodiment of the present invention. This grommet 50 is different from the grommet 30 mainly in that a retaining member formed on the through hole 4 side of the other end 6 is provided. The third holding portion 51 and the fourth holding portion 52, which are similar to the portion 31, are formed on the lower sides of the valley portions 53, 53 between the projecting portions 21, 21, respectively. With such a structure, the adhesion with the linear body 2 is improved, a multi-layered wall is formed, and the sound insulation performance is further improved. Although the sound insulating member is used as the supporting member in each of the above embodiments, the present invention is not limited to this, and a heat insulating member or the like may be used as the supporting member.

[0013]

As described above, according to the present invention, the grommet has a plurality of bellows which are formed with through holes capable of supporting the linear body at both ends and which can be expanded and contracted in the longitudinal direction between the both ends. The hollow portion is formed in a hollow shape, and a concave portion that can be fitted into the wall portion is formed at one end portion thereof, and a support member supported by the wall portion is provided at each of the protruding portions of the bellows-shaped portion that face each other. Since the present invention is characterized in that a protrusion that can be held is formed, even if the wall portion and the support member have different thicknesses, the support member is sandwiched by any of the protrusions of the plurality of bellows-like portions. Since it has one grommet, it is possible to meet multiple specifications with different thicknesses of the wall part and the support member with a single grommet, thereby reducing the cost and improving the sound insulation and heat insulation performance by not creating a gap. You will be able to do it.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a grommet according to a first embodiment of the present invention after being assembled to a wall portion and a supporting member.

FIG. 2 is a partial cross-sectional view of the single grommet shown in FIG.

FIG. 3 is a partial sectional view of a single grommet according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a single grommet according to a third embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a single grommet according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional grommet after being assembled to a wall portion and a sound insulating member.

[Explanation of symbols]

 1 Grommet 20 Grommet 30 Grommet 40 Grommet 50 Grommet 2 Linear body 3 Through hole 4 Through hole 5 End part 6 End part 7 Bellows part 8 Hollow part 9 Wall part 10 Recessed part 11 Sound insulation member (supporting member) 21 Projection part 22 Projection 23 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A through hole capable of supporting a linear body is formed at both ends, and a space between the both ends is formed into a hollow shape which forms a plurality of bellows-like portions which can expand and contract in the longitudinal direction, and at one end thereof. Is formed with a recess that can be fitted into the wall portion, and protrusions that face each other of the bellows-shaped portion are formed with protrusions that can hold a support member supported by the wall portion. Grommet.