JP2001041358A - Soundproof type grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent noise from passing through the soundproof film of a cup part. SOLUTION: In the grommet 1 wherein a soundproof film 2 is extended so as to be provided for the inner side of a cup part 4 inserted through a wire harness, and the soundproof film is turned over in the cup part 4 so as to be housed therein, the turned over part 3 of the soundproof film is made thicker in thickness than the other portions. The turned over part 3 is tapered toward its tip end so as to be increased in thickness. The turned over part 3 is made thick in the thickness except its curved part 18 at its base part side. A cylindrical part is provided for the inner side of the cup part 4, an inclined part 12 is extended outward from the cylindrical part so as to be provided, and the inclined part is continued to the curved part 18 so as to be furthermore continued to the turned over part 3. Or in a grommet wherein the soundproof film is extended so as to be provided for the inner side of the cup part inserted through the wire harness, and the soundproof film is turned over in the cup part so as to be housed therein, a protective wall covering the curved part at the base part side for the turned over part of the soundproof film, is extended so as to be provided for the cup part. The protection wall is projected longer than the curved part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof grommet for waterproofing and soundproofing a portion where a wire harness is passed through a hole of a panel of a vehicle or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional soundproof grommet. The soundproof grommet 41 is formed of synthetic rubber, and has a large-diameter cup portion 42, a small-diameter cylindrical portion 43 penetrating the cup portion 42, a substantially cup-shaped soundproof film 44 extending from the cylindrical portion 43. It is composed of

[0003] The cup portion 42 has a fitting groove 45 for a vehicle panel (not shown) and a flange-shaped seal lip portion 46 on the outer peripheral side. The ridge 47 is provided. A wire harness (not shown) is inserted through the cylindrical portion 43, and is wound and fixed with a vinyl tape (not shown). A waterproof material such as urethane may be injected into the inside of the cylindrical portion 43 or the cup portion 42 in some cases. The soundproofing film 44 is composed of a flared sloping portion 48 and a cylindrical portion 49 following the sloping portion 48.

[0005] As shown in FIG. 5, the soundproof film 44 is turned outward and fitted inside the cup portion 42. Soundproof film 44
Elastically adheres to the inner peripheral surface of the cup portion 42,
2, an annular hollow layer 50 is defined. By closing the opening 52 of the cup portion 42 with the soundproof film 44, it is possible to prevent the sound on the vehicle side from entering the vehicle interior.

[0005]

However, in the above-mentioned conventional structure, when the soundproof film 44 is inverted and fitted into the cup portion 42 as shown in FIG. Since it protrudes slightly from the end face (opening 52) of the cup portion 42, there is a concern that the soundproof film 44 may be pulled out as shown in FIG. there were. In this state, the soundproof film 44 comes off the cup portion 42, and the soundproof effect cannot be obtained. The same applies to the case where the soundproofing film 44 comes out due to vibration or the like during running of the vehicle.

In view of the above, the present invention provides a reliable soundproofing effect without the soundproofing film coming out of the cup portion even when the bent portion of the soundproofing film is caught by something outside. It is an object of the present invention to provide a soundproof grommet that can be used.

[0007]

In order to achieve the above object, according to the present invention, a soundproof film is extended inside a cup portion through which a wire harness is inserted, and the soundproof film is inverted and accommodated in the cup portion. In the soundproof grommet to be used, a soundproof grommet in which an inverted portion of the soundproof film is formed thicker than other portions of the soundproof film is employed (claim 1). It is also effective that the plate thickness of the reversing portion increases in a tapered shape toward the tip of the reversing portion (claim 2). It is also effective that the reversing part is formed thick except for the bent part on the base side of the reversing part (claim 3). In addition, a cylindrical portion is provided inside the cup portion, an inclined portion extends outward from the cylindrical portion, a bent portion follows the inclined portion, and the inverted portion follows the bent portion. Is also effective (claim 4). Further, in a soundproof grommet in which a soundproof film is extended inside the cup portion through which the wire harness is inserted and the soundproof film is reversed and housed in the cup portion, the cup portion includes a reverse portion of the soundproof film. A soundproof grommet in which a protective wall covering the bent portion on the base side is extended is also employed (claim 5). It is also effective that the protective wall projects longer than the bent portion (claim 6). Further, the soundproof grommet according to claim 5 or 6, which has the reversing portion according to any one of claims 1 to 4, is also effective (claim 7).

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show an embodiment of a soundproof grommet according to the present invention.

This soundproof grommet 1 is characterized in that the reverse portion 3 side of the soundproof film 2 is formed in a tapered shape and gradually thicker. The reversing portion 3 becomes gradually thicker toward the tip.

As shown in FIG. 1, the soundproof grommet 1 is made of synthetic rubber as in the prior art, and has a cup portion 4, a cylindrical portion 5,
The soundproof film 2 is formed so as to extend from the cylindrical portion 5. The cup part 4 has an outer peripheral wall 6, a front sealing wall 7, and a rear opening 8, and the peripheral wall 6 has a fitting groove 9 for a panel (not shown), a flange-shaped seal lip part 10, have. In the present embodiment, the position of the seal lip portion 10 is slightly separated from the fitting groove 9 in accordance with the shape on the panel side. An annular space 11 into which the soundproof film 2 is fitted is formed inside the opening 8, that is, between the peripheral wall 6 and the cylindrical portion 5.

The cylindrical portion 5 comprises a small diameter portion 5a protruding forward from the sealing wall 7 and a medium diameter portion 5b located concentrically inside the cup portion 4. A wire harness (not shown) is inserted into and adhered to the small diameter portion 5a, and is wound and fixed with a vinyl tape (not shown). The middle diameter portion 5b is formed to be slightly thicker and has a certain degree of rigidity. A waterproof material such as urethane can be injected into the middle diameter portion 5b and the sealing wall 7 side of the cup portion 4.

The middle diameter portion 5b extends close to the opening 8 in the cup portion 4, and a first inclined portion (inclined portion) 12 having a tapered shape extends from the rear end of the middle diameter portion 5b to the opening 8 so as to extend toward the end. A straight portion 13 extends annularly from the rear end of the inclined portion 12 to the rear end of the seal lip portion 10, and a tapered second inclined portion 14 longer than the first inclined portion 12 extends from the rear end of the straight portion 13 to the end. From the rear end of the second inclined portion 14, a tapered thick portion 15 which is a main component of the reversing portion 3 continues.

The outer peripheral surface 15a of the tapered thick portion 15 is positioned substantially parallel to the grommet axis direction, and the inner peripheral surface 15b of the thick portion 15 is gradually tapered inwardly.
The inner diameter of the thick portion 15 becomes smaller toward the tip 2a. The outer diameter of the thick portion 15 is substantially constant in the longitudinal direction. A short flange-shaped ridge 16 is formed on the circumference inside the tip of the thick portion 15. The boundary between the thick portion 15 and the second inclined portion 14 continues at the circular arc surface 17. First inclined portion 12, straight portion 13, second inclined portion 14, and thick portion 1
5 constitute the soundproof film 2.

As shown in FIG. 2, the soundproof film 2 is turned outwardly (turned up) and fitted into the cup portion 4. The outer peripheral surface 15a of the thick portion 15 of the soundproof film 2 in the molded state of FIG. 1 becomes the inner peripheral surface in the inverted state of FIG. 2, and the inner peripheral surface 15b becomes the outer peripheral surface. A bent portion 18 is formed by the straight portion 13 and the second inclined portion 14 in FIG. The outer peripheral surface 15 a of the thick portion 15 elastically contacts the inner peripheral side of the cup portion 4 by the restoring force of the soundproof film 2. Since the rigidity of the thick portion 15 is higher than that of the other portions of the soundproof film 2, the soundproof film 2 is hardly bent, so that even if the bent portion 18 is caught, the thick portion 1
5 does not escape from the cup 4.

In FIG. 2, the outer peripheral surface 15b of the thick portion 15
Are in line contact with the two anti-slip ridges 19 at the front and rear of the inner peripheral surface 6a of the cup portion 4, and the ridge 16 at the tip of the thick portion is close to the sealing wall 7 and the inner peripheral surface of the cup portion 4 6a makes line contact.
This also increases the catching force of the thick portion 15 in the cup portion 4 and prevents the thick portion 15 from slipping out.

The thick portion 15 is held in a state of being slightly bent in a substantially rectangular shape by the ridges 16 and 19. This makes it difficult for the thick portion 15 to come off due to interference with the inner peripheral surface 6a of the cup portion 4. The outer peripheral surface 15b of the thick portion 15 is located substantially straight along the inner peripheral surface 6a of the cup portion 4, and the inner peripheral surface 15a of the thick portion 15 is tapered inward and inclined. The rigidity of the thick portion 15 is 2
It gradually increases toward the a side. In addition, the contact pressure of the thick portion 15 against the inner peripheral surface 6a of the cup portion 4 gradually increases from the bent portion 18 toward the tip 2a. As a result, escape of the soundproof film 2 is efficiently suppressed. By making the thick portion 15 tapered, the weight of the soundproof film 2 is reduced, the mold is easily removed during molding, and the insertability into the cup portion 4 is improved.

The straight portion 13 and the second inclined portion 14 in FIG.
2 constitutes the bent portion 18 in FIG. 2, but since the first inclined portion 12 projects outward, the bent portion 1 is formed.
8, the radius of curvature is kept small, and the gap between the first inclined portion 12 and the inner peripheral surface 6a of the cup portion 4 is narrowed, which also makes it difficult for the inverted portion 3, that is, the thick portion 15, to come out. In addition, the first inclined portion 12 gives a force for pressing the reversing portion 3 against the inner peripheral surface 6a of the cup portion 4 via the bent portion 18, whereby the reversing portion 3 causes the inner peripheral surface 6a of the cup portion 4 to be pressed.
It is strongly adhered to, making it difficult to escape. Bending part 18
Is thinner than the thick portion 15, so that it is excellent in flexibility and easy to insert the thick portion 15 into the cup portion 4.

As an example, the taper angle of the soundproof film 2 is about 6
°, the maximum thickness T ₁ (FIG. 1) of the thick portion 15 is 4.0 mm,
The thickness T ₂ (FIG. 1) at the starting point of the thick portion 15 is about 2.0 mm. An annular hollow layer 11a is formed between the folded soundproof film 2 and the sealing wall 7 of the cup portion 4.

Even when the thick portion 15 is formed not in a tapered shape but straight, the rigidity is increased, so that the soundproof film 2 is prevented from falling out of the cup portion 4. In this case, as described above, the thick portion 15 is formed. No effect can be obtained due to the fact that is formed in a tapered shape.

In the present embodiment, the bent portion 18 projects slightly rearward from the rear end 10a of the seal lip portion 10. However, from the viewpoint of preventing interference with the outside, the bent portion 18 is located behind the seal lip portion 10. It is preferable to be retracted inside the end 10a.

FIG. 3 shows another embodiment of the soundproof grommet according to the present invention. This soundproof grommet 21 is characterized in that the protection wall 25 of the cup portion 24 extends in the grommet axial direction longer than the bending portion 23 of the soundproof film 22, and the bending portion 23 is accommodated inside the protection wall 25. Is what you do.

Since the bent portion 23 is hidden inside the protective wall 25 in a state where the soundproofing film 22 is inverted in the cup portion 24, the bent portion 23 does not interfere with or be caught by any external matter. Thus, the soundproof film 22 is reliably prevented from being damaged or coming off.

The soundproof film 22 according to the present embodiment is a thin film having a uniform thickness. Thick portion 1 in the above embodiment
The protective wall 25 of the present embodiment is provided on the soundproofing film 2 having the protective film 5 (FIG. 2).
It is also possible to use In this case, the reversal portion 28 is prevented from coming out of the cup portion 24 more reliably. This embodiment is basically the same as the above embodiment except for the shape of the soundproof film 22 and the configuration of the protective wall 25.

The protective wall 25 is formed in a cylindrical shape (annular shape) thinner and shorter than the peripheral wall 27 of the cup portion 24 on the opening 26 side of the cup portion 24, and the inner peripheral surface 25 a of the protective wall 25 is formed inside the cup portion 24. It continues on the same plane as the peripheral surface 27a. The distal end 25b of the protection wall 25 projects beyond the bent portion 23 of the soundproof film 22, and covers the outside of the bent portion 23 so as not to be exposed.

The tip 25b of the protective wall 25 needs to be located at least on the same plane as the bent portion 23. The protruding length L of the protection wall 25 with respect to the bent portion 23 is, for example, 0 to 5
mm. The inner peripheral surface 25a of the protective wall 25 is
And the outer peripheral surface 28b of the reversing part 28 are located close to each other. The front end 25b of the protection wall 25 protrudes rearward from the rear end 29a of the seal lip portion 29 (the rear direction is the direction when the small diameter portion 31 of the cylindrical portion 30 is set to the front). The rear end 29a of the seal lip 29 is the opening 2 of the cup 24.
It is equal to 6.

The thickness of the protective wall 25 is set slightly larger than the thickness of the soundproof film 22 including the bent portion 23. Since the protection wall 25 is an elastic member integral with the cup portion 24, it can be bent by strongly pressing it, but has sufficient rigidity to sufficiently protect the bent portion 23.

The soundproof film 22 is composed of a long inclined portion 32 which is slightly tapered, a bent portion 23 following the inclined portion 32, and an inverted portion 28 following the bent portion 23. Inclined part 3
2 is a part corresponding to the straight cylindrical part 5 (FIG. 1) in the embodiment. The base of the inclined portion 32 continues to the tubular portion 30 at the sealing wall 33 of the cup portion 24, and the tubular portion 30 continues to the small diameter portion 31 protruding outside the cup portion 24.
Since the inclined portion 32 protrudes toward the peripheral wall 27 of the cup portion 24, the radius of the bent portion 23 is smaller than that in the related art, which also prevents the reversing portion 28 from slipping out.

A hollow part 34 is formed between the soundproof film 22 and the cup part 24. The reversing portion 28 is in elastic contact with the cup portion 24 at each of the circumferential ridges 35 and 36. 37
Is a fitting groove for a panel (not shown).

In this embodiment, the soundproof film 22 is composed of an inclined portion 32 located in the cup portion 24, a bent portion 23 following the inclined portion 32, and an inverted portion 28 following the bent portion 23. A cylindrical portion as in the conventional example (FIG. 4) and a cylindrical portion 5 as in the above-described embodiment (FIG. 1) are formed in the cup portion 24, and a soundproof film is extended on the cylindrical portion 5. The protective wall 25 of the present embodiment is also applicable to the soundproof grommet. Further, the inclined portion 32 of the present embodiment may be regarded as an inclined tubular portion.

[0030]

As described above, according to the first aspect of the present invention, since the rigidity of the thick reversal portion of the soundproof film is higher than the other portions of the soundproof film, the reversal portion is hardly bent in the cup portion. Therefore, even when the bent portion is caught or vibration during traveling of the vehicle, the inverted portion is always kept in a substantially straight state, and the inverted portion is caught on the inner peripheral surface of the cup portion, and the inverted portion is inverted from the cup portion. The escape of the part is reliably prevented.

According to the second aspect of the present invention, since the plate thickness increases linearly toward the tip of the reversing portion and is less likely to bend, even if the reversing portion is long, the cup is efficiently provided. Exit from the section is suppressed. Further, since the bent portion side of the reversing portion can be easily bent to some extent, the soundproof film can be easily inserted into the cup portion, and the insertion operation is easy. In addition, the mold removability at the time of rubber molding of the inversion portion is good, and the productivity is improved.

According to the third aspect of the present invention, since the bent portion is thin and easy to bend with respect to the thick reversing portion, the reversing operation of the soundproof film, that is, the inserting operation of the reversing portion into the cup portion is easy. It is. Further, the thin bent portion absorbs the vibration of the reversing portion during the traveling of the vehicle, and prevents the reversing portion from slipping off.
This also prevents the inversion section from slipping out.

According to the fourth aspect of the present invention, the radius of the bent portion is reduced by the inclined portion, and the gap between the inclined portion and the inner peripheral surface of the cup portion is reduced, so that the inverted portion comes out of the cup portion. It becomes difficult. In addition, since the radius of the bent portion is reduced, the inverted portion is strongly pressed against the inner peripheral surface of the cup portion, so that the inverted portion does not easily come out of the cup portion.

According to the fifth aspect of the present invention, since the bent portion of the soundproofing film is covered with the protective wall, the bent portion does not interfere with or be caught by the outside, and the inverted portion is not damaged or slipped out. It is surely prevented.

According to the sixth aspect of the present invention, since the bent portion of the soundproofing film does not protrude from the protective wall, the bent portion is prevented from being damaged and the inverted portion is more securely prevented from coming off.
According to the seventh aspect of the present invention, the reversing portion of the thick plate and the protective wall can be more reliably prevented from coming out of the reversing portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a molded state in one embodiment of a soundproof grommet according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which the soundproof film is inverted in the cup portion.

FIG. 3 is a longitudinal sectional view showing another embodiment of the soundproof grommet according to the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional soundproof grommet.

FIG. 5 is a longitudinal sectional view showing a state in which the soundproofing film is inverted inside the cup part.

FIG. 6 is a sectional view of a main part showing a conventional problem.

[Explanation of symbols]

 1, 21 soundproof grommet 2, 22 soundproof film 3, 28 reversing part 4, 24 cup part 5 cylindrical part 12 first inclined part (inclined part) 18, 23 bent part 25 protective wall

Claims (7)

[Claims] 1. A soundproof grommet in which a soundproof film is extended inside a cup portion through which a wire harness is inserted, and the soundproof film is inverted and accommodated in the cup portion. A soundproof grommet characterized by being formed thicker than other parts of the membrane. 2. The soundproof grommet according to claim 1, wherein the thickness of the inverted portion increases in a tapered shape toward the tip of the inverted portion. 3. The reversing portion is formed thick except for a bent portion on the base side of the reversing portion.
Or the soundproof grommet according to 2. 4. A tubular portion is provided inside the cup portion, an inclined portion extends outward from the tubular portion, a bent portion follows the inclined portion, and the inverted portion is provided at the bent portion. The soundproof grommet according to any one of claims 1 to 3, wherein the grommet is continued. 5. A soundproof grommet in which a soundproof film is extended inside a cup portion through which a wire harness is inserted, and the soundproof film is inverted and accommodated in the cup portion. A soundproof grommet, wherein a protection wall covering a bent portion on a base side of the reversing portion is extended. 6. The soundproof grommet according to claim 5, wherein the protection wall protrudes longer than the bent portion. 7. The soundproof grommet according to claim 5, comprising the reversing portion according to claim 1. Description: