JPH069535Y2 - Grommet device for dash panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a grommet device for inserting a wire harness in a dash panel that separates an engine room and a vehicle compartment of an automobile.

[Conventional technology]

In order to pull the wire harness from the passenger compartment of the automobile into the engine room, holes are provided in the iron plate 1 and the insulator 2 of the dash panel separating the engine room and the passenger compartment, and the wire harness 5 is provided with the grommet 3 as shown in FIG. Grommet 3 that has been inserted into wire harness 5 by inserting wire harness 4 from the vehicle compartment into the engine room by inserting sound-absorbing lid 4 that fits into the opening of the grommet tip
Is fitted into the fitting hole 1a of the iron plate 1, the wire harness 5 is fixed to the base end of the grommet 3 by tape winding, and the sound deadening lid 4 is fitted into the end opening of the grommet 3 to reduce noise in the engine room. It was preventing it from leaking into the room.

A conical bellows-shaped inner cylinder part and a conical outer cylinder part having a larger diameter than this form a grommet, and the flange of the inner cylinder part is fitted into the hole of the dash panel to make the outer cylinder part larger. A grommet of Japanese Utility Model Laid-Open No. 61-23220 is known in which a diameter end edge is brought into contact with a dash insulation for soundproofing.

In addition, a conical bellows-shaped inner grommet and a conical outer grommet that seals the outer periphery to form a space layer are provided, the inner grommet is fitted into the hole of the dash panel, and the edge of the outer grommet is used as the dash panel. Contacting and soundproofing in the space layer.
No. 5 grommet device is known.

[Problems to be solved by the device]

The conventional grommet 3 shown in FIG. 9 has only one iron plate as the mounting portion, and if the sound deadening lid 4 is simply fitted to the opening of the tip of the grommet 3, the iron plate between the insulator 2 and the grommet 3 will not be removed. There is a problem that noise from the engine room cannot be prevented from leaking into the vehicle compartment from a part.

Moreover, the grommet formed of the inner cylinder portion and the outer cylinder portion and the grommet device formed of the inner grommet and the outer grommet disclosed in the above are space portions formed between the inner conical portion and the outer conical portion. The steel plate of the dash panel exposed in this space serves as a noise transmission medium, and the noise reverberates in this space to produce a large amount of noise. Since it is not possible to shut off the engine with only the thin outer cylinder, there is a problem that the soundproof effect of intrusion noise from the engine room is poor.

An object of the present invention is to solve the above problems and to provide a grommet device for a dash panel that has a great effect of preventing noise leaking from the engine room into the vehicle interior.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the grommet device for a dash panel of the present invention is provided with a grommet fitting hole 1a in the iron plate part 1 of the wire harness insertion part 10 of the dash panel and the grommet fitting hole 1a in the insulator part 2. An insulator hole 2c having a larger diameter is provided, and the annular groove 3a of the outer peripheral wall of the tip opening 3d of the semi-conical cylindrical grommet 3 is fitted to the hole edge portion 1b of the grommet fitting hole 1a of the iron plate portion 1,
Inner peripheral edge 2a of the insulator hole 2c and a grommet fitting hole
The iron plate exposed surface by fitting the fitting closing ring 6a of the sound insulating rubber ring 6 into the exposed space 1c of the iron plate 1 between the hole edge 1b of 1a
The end surface of the fitting closing ring portion 6a is brought into contact with 1d, and the flange portion 6b of the sound insulating rubber ring 6 is attached to the outer peripheral portion 2d of the insulator hole 2c.
And the wire harness 5 is inserted into the wire harness insertion portion 3c of the semi-conical cylindrical grommet 3.

[Operation] In the wire harness insertion portion 10 of the dash panel,
The exposed space 1c formed between the grommet fitting hole 1a of the iron plate portion 1 and the large-diameter insulator hole 2c of the insulator portion 2 is exposed by the iron plate portion, so noise in the engine room is exposed to this exposed iron plate. Although it leaks into the vehicle interior through the portion, the noise leaking from the engine room to the vehicle interior is blocked by fitting the fitting closing ring portion 6a of the sound insulating rubber ring 6 into close contact with the exposed space portion 1c.

Between the sound insulation rubber ring 6 and the dash panel, the sound insulation rubber ring 6
Since the collar portion 6b is in close contact with the outer peripheral portion 2d of the insulator hole 2c, no noise-leaking gap is formed between the collar portion 6b and the dash panel, and noise prevention is ensured.

Since the sound insulating rubber ring 6 can be formed thick, and the semi-conical cylindrical grommet 3 can also be formed thick, the noise prevention effect is increased.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an exploded view showing a dash panel separating an engine room and a vehicle compartment from an iron plate portion 1 and an insulator portion 2. The iron plate portion 1 is provided with a grommet fitting hole 1a. 1b is a hole edge portion of the grommet fitting hole 1a, 1c is an exposed space portion of the iron plate portion 1, and 1d is an exposed surface of the iron plate portion 1 exposed in the exposed space portion 1c.

The insulator part 2 is provided with an insulator hole 2c having a diameter larger than that of the grommet fitting hole 1a. Reference numeral 2a is an inner peripheral edge of the insulator hole 2c, 2b is a plate surface of the insulator portion 2, and 2d is an outer peripheral portion of the insulator portion 2 on the outer periphery of the insulator hole 2c.

3 is a semi-conical cylindrical grommet made of rubber or the like, and this grommet 3 has an annular groove 3a provided on the outer circumference of the cylinder wall of the semi-conical cylindrical tip opening 3d. 3c is a wire harness insertion portion formed in a small diameter at the rear end.

Reference numeral 4 is a sound-insulating rubber lid that fits into the front end opening 3d of the grommet 3 as required, and reference numeral 5 is a wire harness that is wired through the dash panel to the engine room and the vehicle compartment side.

Reference numeral 6 is a rubber sound insulating rubber ring having a desired thickness. A grommet fitting hole 7 is provided in the central portion, and a fitting closing ring portion 6a is provided on the front surface of the rubber ring body. 6b is a flange portion of the rubber ring, and 6c is an inner peripheral protruding edge portion of the fitting closing ring portion 6a.

The semi-conical cylindrical grommet 3 has a tip opening 3c.
The annular groove 3a on the outer circumference of the cylinder wall is fitted into the hole edge portion 1b of the grommet fitting hole 1a of the iron plate portion 1.

The sound-insulating rubber ring 6 has the fitting closing ring portion 6a formed between the inner peripheral edge 2a of the insulator hole 2c of the insulator portion 2 and the hole edge portion 1b of the grommet fitting hole 1a of the iron plate portion 1.
Of the sound insulation rubber ring 6 is brought into contact with the exposed surface 1d of the iron plate portion 1 exposed to the exposed space portion 1c of the iron plate portion, and the sound insulation is performed. Collar of rubber ring 6
6b is brought into close contact with the outer peripheral portion 2d of the hole 2c of the insulator portion 2. Inner peripheral protruding edge portion 6c of the fitting closing ring portion 6a of the sound insulating rubber ring 6
Is fitted into the outer peripheral recess of the hole edge portion 1b of the grommet fitting hole 1a.

Pass the wire harness 5 through the wire harness insertion portion 3c at the rear end of the semi-conical cylindrical grommet 3 and fix it with the tape winding fixing portion 9, and then insert the wire harness 5 into the dash panel through the grommet 3 engine room and passenger compartment. Wire across. A sound insulating rubber lid 4 is fitted into the tip opening 3d of the grommet 3 as required.

As described above, by fitting the sound insulating rubber ring 6 in close contact with the exposed space portion 1c of the iron plate portion 1 of the iron plate portion 1 of the dash panel and the grommet mounting portion of the insulator portion 2, the insulator portion 2 and the grommet 3 are connected. It is possible to prevent the noise in the engine room from leaking into the vehicle compartment from the iron plate portion 1 between them.

FIGS. 3 to 8 show another embodiment of the present invention, and the same reference numerals as those in FIGS. 1 and 2 denote the same parts. The embodiment shown in FIG. 3 is an embodiment in which the front surface of the collar portion 6b of the sound insulating rubber ring 6 is provided with a fold on the contact surface with the insulator portion, and the embodiment shown in FIG. Mating closure ring 6a
The embodiment shown in FIG. 5 in which the pleats are provided on the peripheral surface thereof is the embodiment in which the end face of the fitting closing ring portion 6a of the sound insulating rubber ring 6 is provided with the folds. Further, the embodiment shown in FIG. 6 is an annular protrusion provided on the inner peripheral surface of the grommet fitting hole 7 of the sound insulating rubber ring 6.
In the embodiment shown in FIG. 7 in which 6d is fitted in the annular groove 3b provided on the outer periphery of the grommet 3, the annular projection 6d of the sound insulating rubber ring 6 of the embodiment shown in FIG. This is an example. FIG. 8 shows an embodiment in which the sound insulating rubber lid 4 is omitted and the sound insulating rubber ring 6 is provided.

The sound insulating rubber ring 6 may be provided with a split groove for easy mounting.

(Effect of the Invention) As described above, the present invention, in the iron plate exposed space portion formed between the grommet fitting hole of the iron plate portion of the dash panel that separates the engine room and the vehicle compartment and the insulator hole of the insulator portion, Since the sound insulating rubber ring is closely fitted, it is possible to block the noise leaking from the engine room through this exposed iron plate into the vehicle interior, and the collar part of the sound insulating rubber ring is installed between the sound insulating rubber ring and the dash panel. Since it is in close contact with the outer peripheral portion of the hole, a gap through which the noise leaks is not formed between the hole and the dash panel, and the noise can be reliably prevented.

[Brief description of drawings]

1 is a sectional view showing an assembled state of an embodiment of the present invention, FIG. 2 is a sectional view showing an exploded state of an embodiment of the present invention, and FIG.
FIG. 8 to FIG. 8 are views showing another embodiment of the present invention, and FIG. 9 is a view showing a conventional example. 1: Iron plate part 1a; Grommet fitting hole 1b: Hole edge part 1c: Iron plate part exposed space part 1d: Iron plate part exposed surface 2: Insulator part 2a; Inner peripheral edge 2c: Insulator hole 2d: Outer part part 3: Grommet 3a: Annular groove 3c: Wire harness insertion part 5: Wire harness 6: Sound insulation rubber ring 6a: Fitting closed ring part 6b: Collar part 10: Dash panel wire harness insertion part

Claims (1)

[Scope of utility model registration request] 1. A wire harness insertion portion of a dash panel
The iron plate part (1) in (10) is provided with a grommet fitting hole (1a), and the insulator part (2) is provided with an insulator hole (2c) having a diameter larger than that of the grommet fitting hole (1a). Fit the annular groove (3a) at the outer periphery of the tip of the semi-conical cylindrical grommet (3) into the hole edge (1b) of the hole (1a), and fit the grommet with the inner peripheral edge (2a) of the insulator hole (2c). Exposed space part (1c) of the iron plate part (1) between the hole edge part (1b) of the landing hole (1a)
While fitting the fitting blocking ring part (6a) of the sound insulating rubber ring (6) to bring the end surface of the fitting blocking ring part (6a) into contact with the exposed surface (1d) of the iron plate, ) The collar part (6b) is brought into close contact with the outer peripheral part (2d) of the insulator hole (2c), and the wire harness (5) is inserted into the wire harness insertion part (3c) of the semi-conical cylindrical grommet 3. Grommet device.