JP3296161B2 - 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 grommet to be mounted in a state where a wire harness is inserted into a through hole of a vehicle body, and more particularly, to a sound absorbing material such as a sponge and an inner surface of the sound absorbing material on a room inner side surface of a vehicle body panel. The grommet can be easily attached to the vehicle body with the silencer material consisting of the skin to be attached simply by pushing in the grommet from the outside, and the grommet is sealed on both the inner surface of the silencer material skin and the inner and outer surfaces of the body panel. It locks in a state to improve the sound insulation performance.

[0002]

2. Description of the Related Art In an automobile, as shown in FIGS. 7A and 7B, a dash panel D which separates an engine room A and a room B has a sound absorbing material such as a sponge on the inner surface of the body panel 1 on the indoor side. 2 is adhered, and a resin skin 3 is adhered to the inner surface side of the sound absorbing material 2, and the body panel 1, the sound absorbing material 2, and the through holes 1a, 2a, 3a of the skin 3 are formed to communicate with each other. Then, the grommet 5 through which the wire harness W / H is inserted is attached.

The grommet 5 is integrally formed of rubber or an elastomer, and a wire harness W / H is inserted into the small-diameter cylindrical portion 5a in close contact with the grommet 5. In this state, the grommet 5 is moved from the engine room A side to the room B side. Through hole 1
a, 2a, and 3a, the entire large-diameter portion 5b continuously formed at the front end of the small-diameter cylindrical portion 5a is once pushed into the room B, and then pulled back to the engine room A side, whereupon the large-diameter portion 5
The locking concave portion 5c provided on the outer periphery of the body b is locked and attached to the peripheral edge of the through hole 1a of the vehicle body panel 1.

[0004]

The grommet 5 has a large-diameter portion 5b whose outer diameter is larger than the through-hole 1a of the vehicle body panel 1. Therefore, as shown in FIG. It is necessary to insert it obliquely, so to speak. In addition, since the dimension L1 of the locking recess 5c provided in the grommet large-diameter portion 5b is set smaller than the dimension L2 of the locking portion of the vehicle body panel 1, and the adhesion at the time of locking is enhanced, the mounting to the vehicle body is performed. Sometimes, as shown in FIG. 8B, the entire grommet large-diameter portion 5b is once pushed into the room B through the through hole 1a of the vehicle body panel 1, then pulled back to the engine room A, and the locking recess 5c is pushed and expanded. In this state, the vehicle body panel 1 is locked. Therefore, two operations of an operation of pushing the grommet into the room and an operation of pulling the grommet back into the engine room are required, and there is a problem that workability is poor. Further, if the interference member is located on the room B side, it may be difficult to perform the pushing operation on the room B side.

When the grommet 5 once pushed into the room B is pulled back to the engine room A side, as shown in FIG. The grommet 5 may be deformed so as to enter between them, and the locking of the grommet 5 and the vehicle body panel 1 cannot be completely performed.

Furthermore, even if the grommet 5 and the vehicle body panel 1 are locked as designed, as shown in FIG.
Since the through hole 2a of the sound absorbing material 2 is large and a gap C1 is generated between the grommet 5 and the gap C2 between the grommet 5 and the skin 3, noise on the engine room A side through the gaps C1 and C2. However, there is a problem of poor sound insulation performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to attach a grommet to a vehicle body only by pushing the grommet from the engine room side, and to improve sound insulation performance. And

[0008]

In order to solve the above-mentioned problems, the present invention relates to a through-hole formed in a vehicle body having a structure in which a skin is attached to an inner surface of a vehicle body panel on the indoor side through a sound absorbing material. A one-motion type grommet that can be attached to a wire harness and locked into the through hole by an insertion operation from one direction from the outside of the room. It is integrally molded of rubber or elastomer, and is a small-diameter tube through which the wire harness is inserted. Part, an intermediate cylinder portion that is continuous with the front end of the small-diameter tube portion, and is reduced in diameter after being enlarged, an annular front end flange portion that is continuous with the front end of the intermediate cylinder portion and is turned outward, and the small-diameter tube portion. And an annular rear flange portion protruding outward from the outer periphery of the continuous portion of the intermediate cylindrical portion, and the intermediate cylindrical portion and the front end flange portion are thin and flexible. The tip and the wire harness are tape wound In addition to being fixed, the outer circumference of the reduced diameter portion at the front of the intermediate cylindrical portion is wound around a tape and fixed to the inserted wire harness. The front end flange is abutted and locked on the peripheral side indoor surface and the front end flange is abutted and locked on the outdoor side surface of the through-hole peripheral edge of the skin, and the rear flange is on the outdoor side surface of the through-hole peripheral edge of the vehicle body panel. The present invention provides a grommet configured to be abutted and locked.

According to the grommet described above, when the wire harness is mounted at the mounting position, when the front end flange portion is pressed into the through hole of the vehicle body, the flexible front end flange portion is bent inward to reduce the diameter. The vehicle body panel is penetrated, and then the reduced front side surface of the intermediate cylindrical portion contacts the periphery of the through hole of the vehicle body panel. When the press-fitting of the grommet is further continued, the flexible intermediate cylindrical portion, like the front end flange portion, bends radially inward and reduces its diameter to enter the through hole, and the enlarged diameter portion of the intermediate cylindrical portion is It abuts and locks on the indoor side surface around the through hole. At this time, at the same time, the rear flange portion abuts and locks on the exterior surface of the through hole of the vehicle body panel, and the front end flange abuts and locks on the exterior surface of the through hole of the outer skin. I do.

As described above, according to the grommet described above, the grommet can be attached to the through-hole portion of the vehicle body panel by only one motion of pushing the vehicle panel (dash panel) from the outside (engine room side) into the room. . Therefore, unlike the conventional example, there is no need to push the device into the room and then pull it back to the engine room, so that the mounting workability is improved. Further, the outer skin is not deformed and enters between the grommet and the vehicle body panel. Furthermore, in the mounted state, the enlarged diameter portion, the front end flange portion, and the rear end flange portion of the intermediate cylindrical portion are respectively abutted on the vehicle body, so that the sound insulation performance from the engine room to the room can be improved. Also, by wrapping tape around the outer diameter of the reduced diameter part at the front of the intermediate cylindrical part and fixing the wire harness, the front end flange of the grommet faces rearward when the grommet is pushed into the vehicle body and attached. Can be prevented. Therefore,
The grommet can be mounted as intended.

[0011] The intermediate tube portion has a sealing surface at a rear end surface which is enlarged in a direction perpendicular to the axial direction from a continuous portion with the small diameter cylinder portion, and a seal lip portion is provided on an outer peripheral portion of a front end flange portion. A seal lip is provided on the outer periphery of the rear flange. As described above, when the seal surface or the seal lip portion is provided at each of the contact portions, more reliable waterproofing and sound insulation can be achieved.

[0012]

A part of the small-diameter cylindrical portion is provided with a sealant filling portion bulging outward. Thus, by providing the sealant filling portion in the small-diameter cylindrical portion and filling the sealant between the electric wires constituting the wire harness and between the outer periphery of the electric wire group and the inner peripheral surface of the grommet, the waterproof treatment can be surely performed. And the sound insulation can be further improved.

A burring seal portion comprising a thick cylindrical portion is interposed between the small-diameter cylindrical portion and the intermediate cylindrical portion, and an annular seal rib is projected from an outer peripheral surface of the burring seal portion. The rear flange portion protrudes from the rear end of the burring seal portion, and the seal rib of the burring seal portion is pressed against the inner peripheral surface of the burring projecting outward from the outer periphery of the through hole of the vehicle body panel.

As described above, the burring seal portion is interposed between the small-diameter cylindrical portion and the intermediate cylindrical portion, and the seal rib projecting from the outer peripheral surface of the burring seal portion is attached by being pressed against the inner peripheral surface of the burring. Accordingly, the grommet can be attached to the through hole having the burring with good sealing properties.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. As shown in FIGS. 1 to 3, a grommet 10 of the present invention is provided with a wire in a vehicle body panel that separates an engine room A and a room B of an automobile, that is, a dash panel D in a through hole of a vehicle body, as in the above-described conventional example. The harness W / H is inserted and attached.

In the dash panel D, a sound absorbing material 2 made of sponge or urethane is adhered to an inner surface of a vehicle body panel 1 made of a metal plate on the indoor side, and a skin 3 made of a polyvinyl chloride sheet is adhered to the inner surface of the sound absorbing material 2. The through holes 2a, 3a of the sound absorbing material 2 and the skin 3 are the through holes 1a of the vehicle body panel 1.
Is in communication with The vehicle body panel 1 has a through hole 1a.
A cylindrical burring 1d is formed to protrude from a panel outer surface 1c on the periphery of the grommet to the grommet insertion side (engine room side A).

The grommet 10 is a wire harness W
/ H, a burring seal portion 12 continuous with the front end of the small-diameter cylindrical portion 11, an intermediate cylindrical portion 13 continuous with the front end of the burring seal portion 12, and an intermediate cylindrical portion 13 An annular front end flange 14 continuous with the front end of
An annular rear flange portion 15 protruding outward from the rear end of the burring seal portion 12 is provided, and these are integrally formed of rubber or elastomer.

The small-diameter cylindrical portion 11 is provided with a sealant filling portion 11a bulging radially outward on a side continuous with the burring seal portion 12. A projecting portion 1 is formed on the inner peripheral surface of the front end of the small-diameter cylindrical portion 11 so as to protrude annularly and prevent the movement of the sealing agent 17 injected into the sealing agent filling portion 11A and hardened.
1c, and a protrusion 1 for tape fastening at the rear end.
1b is provided.

The burring seal portion 12 is formed of a thick cylindrical portion, and its outer diameter is set to the burring 1d of the vehicle body panel 1.
A seal rib 12a which is formed to have substantially the same diameter as the inner diameter of the burring 1d and presses against the inner peripheral surface of the burring 1d is provided at the center of the outer peripheral surface so as to protrude annularly.

The intermediate cylindrical portion 13 is formed in such a shape that the diameter thereof is increased from the side continuous with the burring seal portion 12 and then reduced, and is thin so as to have flexibility. Further, the intermediate cylindrical portion 13 has a rear end face whose diameter is enlarged in a direction orthogonal to the axial direction from a continuous portion with the burring seal portion 12 and has a sealing surface 13.
a, and the front portion of the reduced front side surface 13c is defined as a diameter that is in close contact with the outer periphery of the wire harness W / H.
3b is provided.

The front end flange portion 14 is formed by annularly turning outward from the front end of the intermediate cylindrical portion 13 and expanding toward the rear side. A seal lip portion 14a is provided on an outer peripheral edge thereof. The seal lip portion 14a is brought into contact with the outdoor side surface 3c at the periphery of the through hole 3a of the skin 3 of the dash panel D. Seal lip portion 14a and seal surface 13a
Between the car body panel 1 and the skin 3 of the dash panel D
Is formed larger than the distance between

The rear side flange portion 15 is formed to protrude from the rear end surface of the burring seal portion 12 in a ring shape in a forward direction and to increase in diameter, and to project from the front end portion of the through hole 1 a of the vehicle body panel 1. A seal lip portion 15a is provided to abut and lock on the outer side surface 1c of the peripheral edge. The seal lip portion 15a protrudes forward from the seal surface 13a of the intermediate cylindrical portion 13. Further, the rear flange portion 15 is provided with a notch 18 from the outer end face on the side continuous with the small diameter cylindrical portion 11.

The grommet 10 has a wire harness W /
When attaching H, first, a small-diameter cylindrical portion 11, a burring seal portion 12, a grommet spreader (not shown),
The wire space harness W / H is passed through the grommet inside by expanding the diameter of the internal space communicated with the intermediate cylindrical portion 13.

Next, the grommet spreader is removed, the inner peripheral surface of the small-diameter cylindrical portion 11 is brought into close contact with the outer peripheral surface of the wire harness W / H, and the tape 20 is wound and fixed. On the other hand, the front end of the intermediate cylindrical portion 13 is turned back and the sealing agent 17 is injected. As a result, the sealant 17 is filled in the sealant filling portion 11a of the small-diameter cylindrical portion 11, and between the electric wires of the wire harness W / H, and between the outer peripheral surface of the electric wire group and the inner peripheral surface of the sealant charging portion 11a. The gap is filled with the sealant 17.

Next, the distal end of the intermediate cylindrical portion 13 is elastically restored to its original state, and the inner peripheral surface of the tape winding portion 13b is brought into close contact with the outer peripheral surface of the wire harness W / H.
The tape 20 is wound around the outer periphery of the tape winding portion 13b to fix the wire harness W / H.

When the wire harness W / H to which the grommet 10 is attached as described above is attached to the dash panel D, the wire harness W / H is provided from outside the dash panel D.
As shown in FIG. 4A, the grommet 10 is press-fitted from the front end flange portion 14 side from the outdoor side surface 1c side of the vehicle body panel 1 through H.

The press-fitting of the grommet 10 causes the flexible front end flange portion 14 to bend radially inward and reduce its diameter.
It is located in the through hole 2a of the sound absorbing material 2 through the burring 1d of the vehicle body panel 1. At this time, since the grommet 10 is provided with a tape wrapping portion 13b at the distal end portion and the distal end portion is fixed to the outer peripheral surface of the wire harness W / H, the distal end portion of the thin intermediate cylindrical portion 13 is located in the rear of the insertion direction. It can be prevented from turning to the side.

Next, the front side surface 1 of the intermediate cylindrical portion 13 whose diameter has been reduced.
The burring 1d of the vehicle body panel 1 abuts on 3c. When the grommet 10 is further press-fitted from this state, as shown in FIG. 4 (B), the intermediate cylindrical portion 13 having flexibility similarly to the front end flange portion 14 is bent inward and reduced in diameter, and is inserted into the burring 1d. Get in.

Next, the seal lip 1 of the rear flange 15
5a comes into contact with the outdoor side surface 1c of the vehicle body panel 1. When the grommet 10 is further pushed in from this state, the rear flange 1
5 is bent rearward in the insertion direction, and the rear end portion is bent into the cut 18, and the intermediate cylindrical portion 13 is inserted into the through hole 1 a of the vehicle body panel 1.
And the attachment of the grommet 10 to the dash panel D is completed.

In the mounted state, as shown in FIG. 1, the sealing surface 13a of the intermediate tubular portion 13 is
The seal lip portion 15a of the rear flange portion 15 is provided on the outdoor side surface 1c of the vehicle body panel 1 and the seal lip portion 15a of the front end flange portion 14 is provided.
4a is in contact with the outdoor surface 3c of the skin 3, and the seal rib 12a of the burring seal portion 12 is in contact with the inner peripheral surface of the burring 1d of the vehicle body panel 1. Can be attached to the
In addition, sound insulation from the engine room A to the room B can be reliably achieved.

Thus, the grommet 10 of the present invention is
By simply press-fitting the dash panel D from the outside, the dash panel D can be attached to the dash panel D at four locations by press-fitting to ensure sound insulation. Therefore, unlike the conventional example, there is no need to push the housing once into the room B and then pull it back toward the engine room A, so that the mounting workability can be improved. Further, the outer skin 3 is not deformed and does not enter between the grommet 10 and the vehicle body panel 1, so that reliable locking can be achieved. Further, in the present embodiment, the small-diameter cylindrical portion 11
Since the sealing agent 17 is filled in the sealing material, waterproof performance and sound insulation performance can be improved.

FIG. 5 shows a grommet 10 'of the second embodiment, which is different from the grommet 10 of the first embodiment in that the small-diameter cylindrical portion 11 is not provided with a sealant filling portion.
Since other configurations are the same, the same reference numerals are given and the description is omitted. Also in the grommet of the second embodiment, there is no problem in terms of sealing performance since the grommet is sealed by the seal lip of the front end flange, the seal lip of the rear end flange, and the seal rib of the burring seal.

FIG. 6 shows a grommet 10 ″ of the third embodiment, which is attached to a dash panel D in which the burring 1 d is not formed on the vehicle body panel 1. In the grommet 10 ″, the small-diameter cylindrical portion 11
The burring seal portion 12 is not formed between the intermediate cylindrical portion 13 and the intermediate cylindrical portion 1.
3 is formed. The grommet 10 ″ has the rear flange portion 15 protruding from a continuous portion of the small-diameter cylindrical portion 11 and the intermediate cylindrical portion 13, and the rear side of the enlarged-diameter portion of the intermediate cylindrical portion 13 is formed on the periphery of the through hole 1 a of the vehicle body panel 1. The contact is locked.

[0035]

As is apparent from the above description, in the grommet of the present invention, the front end flange is attached to the vehicle exterior surface of the skin only by being pushed into the vehicle body such as a dash panel, and the seal lip of the rear side flange is provided. Can be attached to the exterior side surface of the vehicle body panel 1 and the enlarged diameter portion of the intermediate tubular portion can be abutted and locked to the interior side surface of the vehicle body panel, thereby achieving sound insulation. In other words, the grommet can be mounted with sound insulation only by inserting it in one direction from the outside of the body to be mounted. Reliable locking can be achieved without being deformed and entering.

In the above-mentioned grommet, a tape is wound around the outer periphery of the reduced diameter portion at the front portion of the intermediate cylindrical portion, and the wire harness is fixed. It is possible to prevent a situation in which the front end of the grommet is turned rearward and the front end flange does not lock the skin.

Further, since the rear end face of the intermediate cylindrical portion of the grommet is used as a sealing surface and the seal lip portions are provided on the front end flange portion and the rear side flange portion, reliable sound insulation from the engine room side to the room can be ensured. Can be planned.

Further, when a sealant filling portion is provided in the small-diameter cylindrical portion and the sealant is filled between the electric wires constituting the wire harness and between the outer periphery of the electric wire group and the inner peripheral surface of the grommet, a reliable waterproof treatment can be achieved. And sound insulation performance can be further improved.

Furthermore, a burring seal portion is interposed between the small-diameter cylindrical portion and the intermediate cylindrical portion, and a seal rib projecting from the outer peripheral surface of the burring seal portion is attached by pressing against the inner peripheral surface of the burring. The mounted state can be reliably maintained, and the sound insulation from the engine room to the room can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where a grommet of the present invention is attached to a dash panel.

FIG. 2 is a perspective view of the grommet of FIG.

FIG. 3 is a cross-sectional view of the grommet of FIG. 2 taken along line AA.

FIGS. 4A and 4B are cross-sectional views showing a process of attaching to a dash panel.

FIG. 5 is a cross-sectional view illustrating a grommet according to a second embodiment.

FIG. 6 is a sectional view showing a grommet according to a third embodiment.

FIG. 7A is a schematic view showing a state of attachment of a conventional grommet, and FIG. 7B is an enlarged sectional view of a main part.

8 (A) and 8 (B) are cross-sectional views showing a conventional grommet mounting process of a vehicle body, and FIG. 8 (C) is a cross-sectional view showing a problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body panel 1a Through hole 2 Sound absorbing material 2a Through hole 3 Skin 3a Through hole 10 Grommet 11 Small diameter cylindrical part 12 Burring seal part 13 Intermediate cylindrical part 14 Front end flange part 15 Rear flange part W / H Wire harness

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-223661 (JP, A) Japanese Utility Model Showa 57-59282 (JP, U) Japanese Utility Model Showa 58-85717 (JP, U) Japanese Utility Model Showa 53- 55800 (JP, U) Japanese Utility Model 63-2328 (JP, U) Japanese Utility Model Hei 1-81820 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 17/58 H02G 3 /twenty two

Claims (4)

(57) [Claims] 1. An operation of inserting a vehicle body panel into a through hole formed in a vehicle body having a skin attached to an inner side surface of the vehicle body via a sound absorbing material, and attaching the vehicle body panel to a wire harness from one side from an outdoor side. A one-motion type grommet that can be locked in the through hole with a rubber or elastomer integrally formed, and a small-diameter cylindrical portion through which a wire harness is inserted, and after expanding continuously to the front end of the small-diameter cylindrical portion, An intermediate cylinder portion having a reduced diameter, an annular front end flange portion that is continuous with the front end of the intermediate cylinder portion and is folded outward,
An annular rear flange portion protruding outward from the outer periphery of the continuous portion of the small-diameter cylindrical portion and the intermediate cylindrical portion, wherein the intermediate cylindrical portion and the front-end flange portion are thin and flexible. The tip of the small-diameter cylindrical portion and the wire harness are fixed by tape winding, and the outer circumference of the reduced diameter portion at the front portion of the intermediate cylindrical portion is wound by tape and fixed to the inserted wire harness. The enlarged diameter part of the cylinder part is inside the periphery of the through hole of the vehicle body panel
The front flange is abutted against the side surface, the front flange is abutted against the outdoor surface around the through hole of the skin, and the rear flange abuts the outdoor surface around the through hole of the vehicle body panel. Grommet that is configured to be stopped. 2. A rear end surface of the intermediate cylindrical portion, which is enlarged in a direction perpendicular to the axial direction from a continuous portion with the small diameter cylindrical portion, is used as a seal surface, and a seal lip portion is provided on an outer peripheral portion of a front end flange portion. The grommet according to claim 1, further comprising a seal lip provided on an outer peripheral portion of the rear flange. 3. A part of the small-diameter cylindrical portion is bulged outward.
3. The sealant filling part according to claim 1, further comprising:
The grommet described in. 4. A thick wall between the small-diameter cylindrical portion and the intermediate cylindrical portion.
A burring seal portion comprising a cylindrical portion is interposed, and
When an annular seal rib is projected from the outer peripheral surface of the
In both cases, project the rear flange from the rear end of the burring seal.
And project outward from the outer periphery of the through hole of the vehicle body panel.
On the inner peripheral surface of the burring
The grommet according to any one of claims 1 to 3, wherein the grommet presses the rib .