JP3290915B2 - Soundproof grommet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof grommet used for an automobile.

[0002]

2. Description of the Related Art In an automobile, a wiring harness is provided to supply electric power to mounted electric components. When this wire harness is passed through a panel that separates adjacent parts, such as an engine room and a vehicle compartment, the wire harness is inserted through a grommet, and the grommet is fixed to the panel, so that the wire harness can be moved from the engine room to the vehicle interior. It prevents water leakage and shuts off noise.

FIGS. 10 and 11 show a conventional grommet used in this way, respectively. These grommets are composed of a main body 1 formed into a trumpet shape by resin,
Wire insertion portion 2 having a small diameter and extending from one end of main body 1
Has a basic structure, and the inside of the electric wire insertion portion 2 is an electric wire insertion hole 4 through which the wire harness 3 is inserted.

In the grommet shown in FIG. 10, a thick ring-shaped sound insulating member 5 to which an annular sound insulating plate 6 is attached on the front surface is fitted inside the main body 1. By fitting the sound insulation member 5, noise from the engine room can be shielded so as not to leak into the vehicle interior. In addition, insertion holes 5a and 6a through which a wire harness is inserted are formed in central portions of the sound insulation member 5 and the sound insulation plate 6, respectively.

[0005] This grommet is applicable to a case where the wire harness 3 has a difference in diameter.
Therefore, cuts 7 and 8 are formed in the sound insulating member 5 and the sound insulating plate 6, respectively, and radial cut lines 9 are formed in the thick sound insulating member 5 around the insertion holes 5a.

[0006] In the grommet shown in FIG.
The sealing material 10 is injected into the inside of the wire harness insertion portion. By filling the sealing material 10, water leakage from the engine room to the vehicle compartment can be blocked.

In this grommet, an inner cylindrical portion 11 communicating with the electric wire insertion hole 4 is formed inside the main body 1. The inner cylindrical portion 11 is formed through the main body 1 and the space portion 12. By providing the space portion 12, flexibility is provided to a support portion of the wire harness 3.

[0008]

However, FIG.
In the grommet shown in (1), since the sealing property is ensured only by the adhesive force of the electric wire insertion portion to the wire harness, the waterproofness is not perfect, and there is a problem that the water passing through the grommet enters the vehicle interior. Further, the grommet has a problem that the sound insulating member 5 is easily detached from the main body 1.

On the other hand, in the grommet shown in FIG. 11, the inner cylinder portion 11 cannot be deformed into a perfect circle due to the pressure at which the sealing material 10 is injected, and the sealing material 10 is placed around the wire harness 3. There is a problem that it cannot be filled evenly and evenly. Further, by forming the space portion 12, the main body portion 1 is thin, and the main body portion 1 is easily deformed. For this reason, even if it attaches to the panel which separates an engine room and a vehicle compartment, there exists a problem which falls easily from a panel by vibration etc.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to reliably prevent water leakage and soundproofing, and to evenly fill a seal material around the wire harness. An object of the present invention is to provide a soundproof grommet that can prevent falling off from a panel.

[0011]

In order to achieve the above object, the invention according to claim 1 is characterized in that a main body having an opening at the distal end side and an electric wire insertion hole at the base end side, and an intermediate portion between the main body. From the portion toward the opening of the main body, and is provided internally through a space portion, the inside communicates with the wire insertion hole, and a gap is formed between the outer periphery of the wire and the entire circumference of the wire in the axial direction. An inner cylinder portion having: a liquid curable sealing material filled in the inner cylinder portion and the electric wire insertion hole; and a sound insulator made of an elastic body fitted into the space portion. It is characterized by.

In this soundproof grommet, the sealing material filled in the inner cylindrical portion and the wire insertion hole prevents water leakage, and the sound insulator fitted in the space blocks noise. The sound insulator is fitted between the main body and the inner cylinder, and supports both the main body and the inner cylinder, thereby preventing deformation thereof. For this reason, there is no deformation of the inner cylindrical portion at the time of injection of the sealing material, and the sealing material can be evenly and uniformly filled around the wire harness. Also, even in the main body, there is no deformation in the panel mounting state, it can be securely attached to the panel,
Never fall off.

According to a second aspect of the present invention, in the first aspect of the present invention, a ring-shaped pressing rib with which an end surface of the sound insulating body contacts is formed on an inner surface of the main body. The holding rib abuts on the end face of the sound insulator fitted into the space to fix the sound insulator. Therefore, the sound insulator can be held between the main body and the inner cylinder, and the sound insulator does not come off.

According to a third aspect of the present invention, in the first aspect of the present invention, a plurality of small projections with which the end surface of the sound insulating body abuts are formed on the inner surface of the distal end of the main body at intervals. It is characterized by.

Since the small projection contacts the end face of the sound insulator, the sound insulator can be held between the main body and the inner cylinder. In particular, the small projection does not hinder the sound insulator from being fitted into the space.

A fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein a distal end of the inner cylindrical portion projects outside the main body.

The distal end of the inner cylindrical portion projecting from the main body serves as a guide when the sound insulator is fitted into the space, so that the sound insulator can be easily attached.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the sound insulating body is prevented from falling out of the space over the entire outer periphery of the tip of the inner cylindrical portion protruding outside the main body. A rib is provided.

In this soundproof grommet, when the electric wire is inserted into the electric wire insertion hole, even if the sound insulator fitted inside the space portion is displaced from the position outside the inner cylindrical portion, it comes into contact with the rib. The body does not fall out of the space.

[0020] The invention of claim 6 is the invention according to any one of claims 1 to 5, wherein the sound insulating body is a resin foam.

[0021] By making the sound insulator a foam, the elasticity of the sound insulator is increased and the fitting becomes easy. Also, to absorb or attenuate noise, the sound insulation power is large,
Effective soundproofing becomes possible.

[0022]

FIG. 1 is a perspective view of a first embodiment of the present invention, and FIG. 2 is a sectional view thereof. The soundproof grommet of this embodiment includes a main body 21, an inner cylinder 22, and a sound insulator 23.
It has.

The main body 21 has an opening 3 having a large diameter.
4 is formed of a soft elastic material so as to have a trumpet shape having a front end 4, and an electric wire insertion portion 25 having a small-diameter electric wire insertion hole 24 formed at the base end side is continuously provided. A panel (not shown) is provided on the front end side of the outer surface of the main body 21.
Is formed in a ring shape. The panel is provided, for example, to partition an engine room and a vehicle compartment of an automobile. Wire insertion hole 2
4, a wire harness 27 is inserted.

The inner cylindrical portion 22 is integrally formed inside the main body 21. The inner cylindrical portion 22 is formed by standing upright from an intermediate portion of the inner surface of the main body 21 toward the opening 34 of the main body 21, and the inside thereof communicates with the electric wire insertion hole 24. Further, by forming the inner cylindrical portion 22 in this way, a space 28 is provided between the inner cylindrical portion 22 and the main body 21.

The inside of the inner cylindrical portion 22 and the wire insertion hole 24
Is filled with a liquid sealing material 29. The sealing material 29 is in a liquid state, is filled in the inside thereof by injection, and hardens over time. Since the filled sealing material 29 fills the gap between the wire harness 27, the electric wire insertion hole 24, and the inner cylindrical portion 22, it is possible to prevent water from leaking from between them.

The inner surface of the inner cylindrical portion 22 has an engaging ridge 3
A plurality of 0 and 31 are formed. The engagement ridges 30, 3
Due to 1, the inner surface of the inner cylindrical portion 22 becomes uneven, so that the sealing material 29 is firmly engaged. Thereby, the sealing material 29
Is not peeled off, and the waterproofing power can be maintained for a long time.

The sound insulator 23 is formed of a thick ring-shaped elastic body, and is fitted in a space 28 provided between the main body 21 and the inner cylinder 22. A sound insulation plate 32 made of a vinyl chloride resin or the like is formed by bonding or the like on the end surface of the front end of the sound insulation body 23. Due to its elasticity, the sound insulator 23 absorbs or reduces noise, so that the noise is cut off and sound is prevented. Further sound insulator 2
3 acts to support the main body 21 from the inside and to support the inner cylinder 22 from the outside by being fitted into the space 28.

In this embodiment, a holding rib 33 is formed on the inner surface of the main body 21. The holding rib 33 is formed in a ring shape, and the main body 2 is positioned so as to be located on the opening 34 side.
1 is formed on the inner surface. Further, the holding rib 33 is formed so as to have a gap with the inner cylindrical portion 22, and the sound insulating body 23 is fitted into the space 28 through the gap. The pressing rib 33 abuts on the end face of the sound insulating body 23, that is, the sound insulating plate 32.
Is held in the space 28. This prevents the sound insulator 23 from coming off.

The assembly of this embodiment is performed by the wire harness 2
7 is inserted into the main body 21 and the electric wire insertion hole 24, and then the sound insulating body 23 is inserted into the space 28 between the main body 21 and the inner cylinder 22.
, And fixed by the holding ribs 33, and thereafter, the liquid sealing material 29 is injected into the inner cylindrical portion 22 and the electric wire insertion hole 24 and cured.

In the injection of the sealing material 29 in this assembly, since the inner cylindrical portion 22 is supported by the sound insulating body 23, the inner cylindrical portion 22 is not deformed by the injection pressure of the sealing material 29. Therefore, the periphery of the wire harness 27 can be evenly and evenly filled with the sealing material 29, and water can be reliably stopped by the sealing material 29. Further, since the sound insulator 23 also supports the main body 21, the rigidity can be given to the main body 21. For this reason, there is no deformation of the main body 21 in the state where the panel is mounted, and the main body 21 can be securely mounted on the panel and does not fall off.

FIG. 3 is a perspective view of the second embodiment, and FIG. 4 is a cross-sectional view of the second embodiment. The same elements as those in the first embodiment are assigned the same reference numerals.

In this embodiment, the inner cylindrical portion 22 is formed to be long, so that the tip portion protrudes outside the opening 34 of the main body 21. The protruding tip portion serves as a guide portion 35 of the sound insulating body 23.

That is, prior to fitting the sound insulator 23 into the space 28, the guide portion 3 of the inner cylinder 22 is attached to the sound insulator 23.
By inserting 5 and sliding along the guide portion 35, the sound insulator 23 can be inserted into the space 28. Thereby, the sound insulating body 23 does not get caught on the holding rib 33 formed on the inner surface of the main body 21, so that the sound insulating body 23 can be easily fitted, and the workability of assembly is improved.

FIG. 5 is a perspective view of the third embodiment, FIG. 6 is a sectional view thereof, and FIG. 7 is a front view. In this embodiment, a small protrusion 38 is formed on the main body 21. The small projections 38 are formed in a semicircular arc shape, and are formed in a plurality at intervals on the inner surface of the distal end portion of the main body 21, and the end surface of the sound insulating body 23 fitted into the space 28, that is, an annular sound insulating plate 32, and acts to hold the sound insulator 23 in the space 28.

The sound insulator 23 is thereby prevented from coming off. However, since the sound insulator 23 has a semicircular shape and is small, the sound insulator 23 is not caught. For this reason, it does not become a hindrance when fitting the sound insulator 23 into the space 28, and the fitting can be performed smoothly. In this embodiment as well, the guide portion 35 is formed by projecting the distal end portion of the inner cylindrical portion 22 outside the main body portion 21, and by using this guide portion 35, the mounting of the sound insulating portion 23 is performed. Can be performed more easily.

FIG. 8 is a perspective view showing the soundproof grommet of the fourth embodiment, and FIG. 9 is a sectional view thereof. In this embodiment, a rib 36 for preventing the sound insulating body 23 from dropping out of the space is provided on the entire outer periphery of the distal end of the inner cylindrical portion 22 protruding outside the main body 21.

When the electric wire is inserted through the electric wire insertion hole 24, the rib 36 is displaced by the body portion 21 extending in the axial direction of the electric wire, so that the position of the sound insulating body 23 inserted into the space 28 is shifted. That is, even if the outer periphery of the inner cylindrical portion 22 moves outward, the movement is regulated by the rib 36, so that the sound insulating body 23 does not fall out of the inner cylindrical portion 22 and does not fall off. The provision of the ribs in the inner cylinder improves the strength of the inner cylinder and makes the inner cylinder less likely to deform.

As the sound insulator 23 in the above embodiment, a resin foam can be used. Since the sound insulator 23 is made of a resin foam as described above, the elasticity of the sound insulator 23 is increased, and the sound insulator 23 is easily fitted into the space 28. In addition, the noise is efficiently absorbed or largely attenuated. There is a merit that effective soundproofing becomes possible.

[0039]

According to the first aspect of the present invention, the sealing member prevents water leakage, and the sound insulator blocks noise. Since the sound insulator is fitted between the main body and the inner cylinder, it supports both the main body and the inner cylinder to prevent deformation thereof. For this reason, there is no deformation of the inner cylindrical portion at the time of injection of the sealing material, and the sealing material can be evenly and uniformly filled around the wire harness.
In addition, since the rigidity of the main body is increased, there is no deformation when attached to the panel, and it can be securely attached to the panel and does not fall off.

According to the second aspect of the present invention, since the pressing rib comes into contact with the end surface of the sound insulating body fitted into the space, and fixes the sound insulating body, the sound insulating body can be satisfactorily held.

According to the third aspect of the present invention, since the sound insulator is held between the main body and the inner cylindrical portion by the small projection, the sound insulator does not become an obstacle when the sound insulator is fitted into the space.

According to the fourth aspect of the present invention, the tip of the inner cylindrical portion protruding outside the main body serves as a guide when the sound insulator is fitted into the space, so that the sound insulator can be easily attached. it can.

According to the fifth aspect of the present invention, even if the sound insulator moves from the space when the electric wire is inserted into the electric wire insertion hole, the movement is regulated by the rib, so that the sound insulator can be prevented from falling off. it can. In addition, the provision of the ribs in the inner cylinder improves the strength of the inner cylinder and makes the inner cylinder less likely to deform.

According to the sixth aspect of the present invention, since the sound insulator is made of a foam, the elasticity of the sound insulator is increased, the fitting becomes easy, and the noise is efficiently absorbed or largely attenuated. Effective soundproofing becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the first embodiment.

FIG. 3 is a perspective view of a second embodiment.

FIG. 4 is a cross-sectional view of the second embodiment.

FIG. 5 is a perspective view of a third embodiment.

FIG. 6 is a cross-sectional view of the third embodiment.

FIG. 7 is a front view of the third embodiment.

FIG. 8 is a perspective view of a fourth embodiment.

FIG. 9 is a sectional view of a fourth embodiment.

FIG. 10 is an exploded perspective view of a conventional grommet.

FIG. 11 is a sectional view of another conventional grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Main body part 22 Inner cylinder part 23 Sound insulator 24 Electric wire insertion hole 25 Electric wire insertion part 27 Wire harness 28 Space part 29 Sealing material 36 Rib

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-228208 (JP, A) JP-A-5-23353 (JP, U) JP-A 62-131316 (JP, U) JP-A-1- 66713 (JP, U) Shokai Sho 56-79784 (JP, U) Shokai Sho 57-15626 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 3/22 B60R 16 / 02 H01B 17/58

Claims (6)

(57) [Claims] 1. A forming an opening on the distal end side, and a body portion having a wire insertion hole on the base end side, before the middle portion of the body portion
Erected integrally toward the opening of the serial body portion, an internal provided via the space portion therein communicating with the wire insertion hole, a gap over the axial entire region of the wire between the wire outer periphery
Having an inner cylinder portion, a liquid curable sealing material filled in the inner cylinder portion and the electric wire insertion hole, and a sound insulator made of an elastic body fitted into the space portion. Characterized soundproof grommet. 2. The soundproof grommet according to claim 1, wherein a ring-shaped holding rib with which an end face of the sound insulating body abuts is formed on an inner surface of the main body. 3. The soundproofing device according to claim 1, wherein a plurality of small projections with which an end face of the sound insulating body abuts are formed at intervals on an inner surface of a tip of the main body. Grommet. 4. The soundproof grommet according to claim 1, wherein a tip of the inner cylindrical portion protrudes outside the main body. 5. The invention according to claim 4, wherein a rib for preventing the sound insulating body from dropping out of the space is provided on the entire outer periphery of a tip of the inner cylindrical portion protruding outside the main body. A soundproof grommet characterized by: 6. The soundproof grommet according to claim 1, wherein the sound insulator is a resin foam.