JP2016157638A - Grommet and attaching method of grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which can conduct forming and mold release of a grommet main body easily and can show stable and high sound insulation performance.SOLUTION: A grommet consists of a grommet main body 10 consisted of rubbers and a sound insulating board 30 formed in another form with the grommet main body and consisted of optional materials. The grommet main body 10 has a large diameter cylindrical part 11 having a panel engagement unit 12 in a periphery, two small diameter cylindrical parts 13, 14 arranged at the opposite sides of it, and two taper tube-shaped connection shielding wall 15, 16. Annular fitting groove 20 which a fringe 31 of the sound insulating board 30 fits is formed in the internal circumference of the large diameter cylindrical part, and inside of the grommet main body is partitioned off in two sealing space S1, S2 by the sound insulating board.SELECTED DRAWING: Figure 1

Description

  For example, when wiring harnesses (electric wires) are routed through a vehicle body panel (such as a dash panel or a rear panel) that partitions the interior of a vehicle from the exterior of the vehicle, the protection of the panel penetration of the wire harness is provided. Therefore, the present invention relates to a grommet that is used by being fitted into a through-hole of a panel in order to ensure quietness and airtightness in a vehicle interior.

  This type of grommet is attached to a through-hole provided in a vehicle body panel that partitions the interior of a vehicle from the exterior of the vehicle to ensure airtightness and quietness in the interior of the vehicle. Recently, quietness in the passenger compartment has been strongly demanded, and grommets with improved sound insulation performance have been developed.

  FIG. 3 shows a configuration example of a grommet in which a sound insulating wall is integrally provided in order to improve sound insulating performance (see, for example, Patent Document 1).

  The grommet 101 includes a large-diameter cylindrical portion 111 having a panel engaging portion 112 that engages with an inner peripheral edge of the through hole Pa of the vehicle body panel P, and a first small-diameter cylindrical portion through which an electric wire (wire harness) W is inserted. 113 and the second small-diameter cylindrical portion 114, the thick wall 115 that couples the first small-diameter cylindrical portion 113 and the large-diameter cylindrical portion 111, the outer peripheral edge is coupled to the large-diameter cylindrical portion 111, and the inner peripheral edge is the second small-diameter cylindrical portion. 114, a thin tubular shielding wall 116 (funnel-shaped) coupled to 114, and an annular sound insulation wall 117 projecting on the inner periphery of the coupling shielding wall 116 near the large-diameter cylindrical portion 111. Have. The first small-diameter cylindrical portion 113 and the second small-diameter cylindrical portion 114 are formed so as to be tightly fitted to the outer periphery of the electric wire W finally.

  When this grommet 101 is attached to the through hole Pa of the panel P, the first small diameter cylindrical portion 113 and the electric wire W are wound and fixed with a tape, and the second small diameter cylindrical portion 114 and the electric wire W are also fixed with a tape. Thereby, two sealed spaces 118 and 119 partitioned by the sound insulation wall 117 are secured in the grommet 101. Therefore, the sound insulation is enhanced by the presence of the sound insulation wall 117 and the sealed spaces 118 and 119.

FIG. 4 is a schematic explanatory view for explaining a method of releasing the grommet 101 from the internal mold 140 after the grommet 101 of FIG. 3 is molded.
When releasing the molded grommet 101 from the internal mold 140, air N is blown from, for example, the second small-diameter cylindrical portion 114, which is an opening on one end side of the grommet 101, and the grommet 101 is removed by the force of air. The diameter is forcibly expanded as indicated by an arrow B1. Then, with the diameter expanded, the grommet 101 is released from the internal mold 140 by pulling the grommet 101 to one side in the axial direction indicated by the arrow B2.

  However, when the sound insulating wall 117 is integrally provided inside the grommet 101 as in the example of FIG. 3, it is difficult to release the sound insulating wall 117 because it interferes. For example, the longer the length H1 of the sound insulation wall 117, the more difficult the mold release becomes, so the length of the sound insulation wall 117 is limited. However, if the length H1 of the sound insulation wall 117 is limited, the sound insulation performance may be affected.

  FIG. 5 shows a configuration example of a grommet in which a sound insulating body formed separately from the grommet main body is fitted inside the grommet main body in order to improve the sound insulating performance (see, for example, Patent Document 2).

  The soundproof grommet 201 includes a grommet main body 210 made of an elastic material such as rubber, and a sound insulating body 230 that is formed separately from the grommet main body 210 and is inserted into the grommet main body 210 later. An electric wire through hole 231 for inserting the electric wire W is formed in the central portion of the sound insulating body 230.

  The grommet main body 210 includes a large-diameter cylindrical portion 211 provided with a panel engaging portion 212 that engages with the inner peripheral edge of the through hole Pa of the panel P on the outer periphery, and a small-diameter cylindrical portion 213 that closely fits on the outer periphery of the electric wire W. A tapered cylindrical shape in which the outer peripheral edge is coupled to the large diameter cylindrical portion 211 and the inner peripheral edge is coupled to the small diameter cylindrical portion 213 to shield the annular space between the large diameter cylindrical portion 211 and each small diameter cylindrical portion 213 ( And a connecting shielding wall 215 having a funnel shape. A locking claw portion 218 that locks the sound insulating body 230 inserted into the grommet main body 210 is provided on the inner periphery on the opening side of the large diameter cylindrical portion 211.

  The grommet 201 elastically press-fits the sound insulating body 230 through which the electric wire W is inserted into the inner periphery of the large-diameter cylindrical portion 211 of the grommet main body 210 through which the electric wire W is inserted. It is assembled by retaining. And it is attached to the panel P by engaging the panel engaging part 212 of the large diameter cylindrical part 211 of the grommet main body 210 with the inner periphery of the through-hole Pa of the panel P. FIG. Since the sound insulating body 230 is disposed inside the grommet main body 210 in such a mounted state, it is possible to limit the penetration of the transmitted sound that passes through the through hole Pa of the panel P, and to improve the sound insulating property. it can.

  By the way, in this grommet 201, the sound insulating body 230 formed separately from the grommet main body 210 is simply inserted into the grommet main body 210 and is prevented from coming off by the locking claw portion 218. There is a possibility that the sound insulator 230 may come off or be displaced when attaching to the panel P. In such a case, the sound insulation may be adversely affected.

JP 2005-324613 A Japanese Patent Laid-Open No. 11-122756

  As described above, the conventional grommet 101 shown in FIG. 3 has a problem in releasability at the time of molding, and if the length of the soundproof wall is limited for the improvement, there is a possibility that the sound insulation performance is adversely affected. was there. Further, in the conventional grommet 201 shown in FIG. 5, there is a possibility that the position of the sound insulating body 230 formed separately from the grommet main body 210 may shift or come off, and thus it may be difficult to ensure stable sound insulation. there were.

  The present invention has been made in view of the above-described circumstances, and the object thereof is to easily perform molding and release of the grommet body, and a grommet capable of stably exhibiting high sound insulation performance, and the grommet thereof. It is to provide an attachment method.

In order to achieve the above-described object, the grommet according to the present invention is characterized by the following (1) to (4).
(1) A large-diameter cylindrical portion having a panel engaging portion that engages with the inner peripheral edge of the through hole of the panel on the outer periphery;
Two small-diameter cylindrical portions that are arranged on both sides in the axial direction of the large-diameter cylindrical portion and are closely fitted to the outer periphery of the electric wire passed through the through-hole,
Two connecting shielding walls whose outer peripheral edge is coupled to the large diameter cylindrical portion and whose inner peripheral edge is coupled to the small diameter cylindrical portion and shields the annular space between the large diameter cylindrical portion and each small diameter cylindrical portion. And having
The large-diameter cylindrical portion, the two small-diameter cylindrical portions, and the two connecting shielding walls form a grommet main body, and the grommet main body is a grommet constituted by an elastic material,
A sound insulating plate formed separately from the grommet body and closely fitted to the outer periphery of the electric wire is disposed inside the grommet body, thereby partitioning the inside of the grommet body into a plurality of sealed spaces.
(2) In the grommet configured as described in (1) above,
An annular fitting groove is formed inside the grommet body, and the inner periphery of the grommet body is formed by fitting the outer peripheral edge of a sound insulating plate integrated with the wire in advance into the fitting groove. Be partitioned into multiple sealed spaces.
(3) In the grommet configured as described in (2) above,
The fitting groove is provided at a position on the inner peripheral side corresponding to the panel engaging portion on the outer periphery of the large-diameter cylindrical portion.
(4) In the grommet having any one of the constitutions (1) to (3),
A slit that can be opened and closed from the outer peripheral edge to the inner peripheral edge is provided at one place in the circumferential direction of the sound insulating plate.

According to the grommet having the configuration (1), since the sound insulating plate is formed separately from the grommet main body, it is necessary to integrally form a sound insulating flange (sound insulating wall) on the grommet main body as in the conventional example. There is no. Therefore, it becomes easy to mold, and simplification of die cutting (release) at the time of molding the grommet body can be achieved. In addition, since the sound insulating plate is separate from the grommet body, the sound insulating plate can be formed so as to exhibit sufficient sound insulating properties. For example, it is possible to arbitrarily select a material including the material and thickness of the sound insulating plate, and the degree of design freedom is increased, so that the sound insulating property can be improved.
According to the grommet having the configuration (2), since the sound insulating plate is fitted in the fitting groove on the inner periphery of the grommet body, the sound insulating plate can be reliably positioned and fixed. For example, there is no risk that the sound insulation plate will be displaced or detached. Therefore, stable and high sound insulation performance can always be exhibited.
According to the grommet having the configuration (3), the sound insulating plate can be disposed at the position of the panel. Therefore, most of the opening area of the through hole of the panel can be closed with the sound insulating plate, and the soundproof performance can be further improved.
According to the grommet of the configuration (4), the sound insulating plate can be easily fitted to the outer periphery of the electric wire while opening the slit, and the assembling property can be improved.

In order to achieve the above-mentioned object, the grommet mounting method according to the present invention is characterized by the following (5).
(5) The grommet mounting method according to (1) above,
Fitting the sound insulation board to the outer periphery of the wire;
Thereafter, the electric wire is inserted into the inside of the grommet main body, and the sound insulating plate is inserted into the grommet main body through the enlarged small diameter cylindrical portion in a state where one of the small diameter cylindrical portions is expanded. Process,
The outer peripheral edge of the sound insulating plate is fitted into the annular fitting groove on the inner circumference of the large-diameter cylindrical portion of the grommet body, and before and after that, the panel engaging portion on the outer circumference of the large-diameter cylindrical portion of the grommet body Engaging the inner peripheral edge of the through hole of the panel;
Be provided.

  According to the method for attaching a grommet having the above configuration (5), since the sound insulating plate is attached to the grommet main body and the grommet main body is attached to the panel in a state where the sound insulating plate is attached to the electric wire in advance, the attachment can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, while a grommet main body can be shape | molded easily, the shape | molded grommet main body can be easily released from an internal metal mold | die. In addition, since the sound insulating plate is separate from the grommet body, the sound insulating plate can be formed so as to exhibit sufficient sound insulating properties. That is, since the degree of freedom in designing the sound insulation plate is great, it is possible to exhibit sound insulation performance that meets the requirements. In addition, when the sound insulation plate is fitted in the fitting groove of the grommet body, the sound insulation plate can be surely positioned and fixed, and there is no risk of the sound insulation plate being displaced or detached when attaching the grommet, More stable sound insulation performance can be maintained.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a configuration diagram of a grommet according to an embodiment of the present invention, where (a) is a cross-sectional view showing a state before attachment, and (b) is a cross-sectional view showing a state after attachment. It is a block diagram of the sound insulation board which concerns on the embodiment, (a) is a perspective view which shows the state before attaching to an electric wire, (b) is a perspective view which shows the state which is going to attach to an electric wire, (c) is attached to an electric wire FIG. It is sectional drawing which shows one structural example of the conventional grommet which improved the sound insulation. It is typical explanatory drawing for demonstrating the mold release method after shaping | molding of the grommet of FIG. It is sectional drawing which shows one structural example of the other conventional grommet which improved the sound insulation.

Specific embodiments relating to the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of a grommet according to an embodiment, (a) is a cross-sectional view showing a state before attachment, (b) is a cross-sectional view showing a state after attachment, and FIG. (A) is a perspective view which shows the state before attaching to an electric wire, (b) is a perspective view which shows the state which is going to attach to an electric wire, (c) is a perspective view which shows the state after attaching to an electric wire.

  As shown in FIGS. 1 (a) and 1 (b), this grommet 1 includes an electric wire (wire harness) W and a panel P that are passed through a through hole Pa provided in a vehicle body panel P that partitions the vehicle compartment side and the outdoor side of the automobile. The grommet body 10 is integrally formed of an elastic material such as rubber or elastomer, and the sound insulating plate 30 is formed separately from the grommet body 10.

  The grommet body 10 made of an elastic material includes a thick-walled large-diameter cylindrical portion 11 having an annular panel engaging portion 12 that engages with the inner peripheral edge of the through hole Pa of the panel P, and a large-diameter cylindrical portion 11. Two small-diameter cylindrical portions 13 and 14 that are arranged on both sides in the axial direction and are tightly fitted to the outer periphery of the electric wire W that passes through the through hole Pa, and the outer peripheral edge is coupled to the large-diameter cylindrical portion 11 and the inner peripheral edge Are coupled to the small-diameter cylindrical portions 13 and 14, and two tapered cylindrical thin-walled connecting shielding walls 15 and 16 that respectively shield the annular spaces between the large-diameter cylindrical portion 11 and the small-diameter cylindrical portions 13 and 14; ,have. An annular fitting groove 20 is formed on the inner circumference of the large-diameter cylindrical portion 11 so as to be positioned on the inner circumference side of the outer panel engaging portion 12 and to which the outer circumferential edge 31 of the sound insulating plate 30 is fitted. Yes.

  The sound insulating plate 30 is fitted in the annular fitting groove 20 of the grommet body 10 with the outer peripheral edge 31 fitted in close contact with the outer periphery of the electric wire W, so that the inside of the grommet body 10 is separated into two sealed spaces S1. , S2 is formed as an annular disk. As shown in FIGS. 2 (a) to 2 (c), an opening and closing from the outer peripheral edge 31 to the inner peripheral edge 32 is made at one place in the circumferential direction of the annular sound insulating plate 30 in order to facilitate attachment to the electric wire W. A possible slit 33 is provided.

  As a material of the sound insulating plate 30, a metal plate having a high sound insulating property (for example, an iron plate or a lead plate), a laminated plate of metal or metal, a honeycomb structure plate, a resin plate, a hard rubber plate, or the like can be employed. Moreover, what is necessary is just to select arbitrarily the thickness of the sound insulation board 30, an outer diameter dimension, etc. in view of the sound insulation performance requested | required, the size of the grommet main body 10, etc. Further, ribs may be provided on the plate surface of the sound insulating plate 30 to increase rigidity and make it difficult to vibrate.

  When this grommet 1 is used, first, as shown in FIG. 2 (b), both side portions of the slit 33 of the sound insulating plate 30 are pushed to the opposite sides in the axial direction as indicated by an arrow A3. open. Then, the electric wire W is inserted into the opened slit 33 as indicated by an arrow A4, and the sound insulating plate 30 is fitted to the outer periphery of the electric wire W as shown in FIG.

  Next, as shown by an arrow A1 in FIG. 1A, the electric wire W is inserted into the grommet main body 10 and attached to the outer periphery of the electric wire W with one small-diameter cylindrical portion 14 expanded in diameter. The sound insulation plate 30 is inserted into the grommet body 10 through the enlarged small diameter cylindrical portion 14. Next, the outer peripheral edge 31 of the sound insulating plate 30 inserted into the grommet body 10 is fitted into the annular fitting groove 20 on the inner circumference of the large-diameter cylindrical portion 11 of the grommet body 10. Next, the small diameter cylindrical portions 13 and 14 at both ends of the grommet body 10 and the electric wire W are fixed with a tape, a band, or the like. By doing so, it is difficult for the sound insulation plate 30 to be displaced. In addition, two sealed spaces S <b> 1 and S <b> 2 partitioned by the sound insulating plate 30 are secured inside the grommet body 10.

  Thereafter, the grommet main body 10 is inserted into the through hole Pa of the panel P as indicated by an arrow A2, and the panel engaging portion 12 on the outer periphery of the large diameter cylindrical portion 11 of the grommet main body 10 is connected to the inner peripheral edge of the through hole Pa of the panel P. Engage with. This completes the installation.

  In the grommet 1 having the above configuration, the sound insulating plate 30 is disposed inside the grommet body 10, and the inside of the grommet body 10 is partitioned into two sealed spaces S1 and S2. The transmitted sound D about to enter the room can be reduced, and the sound insulation performance of the grommet 1 can be improved.

  Further, since the sound insulating plate 30 is formed separately from the grommet main body 10, it is not necessary to integrally form a sound insulating flange (sound insulating wall) on the grommet main body 10 as in the conventional example. Therefore, it becomes easy to mold, and simplification of mold release (release) at the time of molding the grommet body 10 can be achieved.

  Moreover, since the sound insulation board 30 is a separate body from the grommet main body 10, the sound insulation board 30 can be formed so that sufficient sound insulation can be exhibited. That is, since the degree of freedom in designing the sound insulating plate 30 is great, it is possible to exhibit sound insulating performance that meets the requirements.

  Further, since the sound insulating plate 30 is fitted in the fitting groove 20 of the grommet body 10, the sound insulating plate 30 can be reliably positioned and fixed, and the sound insulating plate 30 is positioned when the grommet 1 is attached. There is no risk of slipping or coming off. Therefore, stable and high sound insulation performance can always be exhibited.

  Moreover, in this grommet 1, since the sound insulation board 30 is provided with the slit 33, the sound insulation board 30 can be easily fitted to the outer periphery of the electric wire W while the slit 33 is opened, and the assembling property can be improved.

  Further, in this grommet 1, the fitting groove 20 of the sound insulating plate 30 is provided at the position on the inner peripheral side corresponding to the panel engaging portion 12 on the outer periphery of the large diameter cylindrical portion 11. A sound insulating plate 30 can be arranged. Therefore, most of the opening area of the through hole Pa of the panel P can be closed with the sound insulating plate 30, and the soundproof performance can be further improved.

  As described above, when the sound insulation plate 30 is attached to the outer periphery of the electric wire W in advance and the sound insulation plate 30 is attached to the grommet body 10 and the grommet body 10 is attached to the through hole Pa of the panel P, the attachment is easy. Can be.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, in the above embodiment, only one sound insulating plate 30 is provided. However, a plurality of sound insulating plates may be provided by providing a plurality of annular fitting grooves 20.

  Further, if the two airtight spaces S1 and S2 partitioned by the sound insulating plate 30 in the above embodiment are filled with a sound absorbing material, the sound insulating performance can be further improved.

Here, the features of the embodiments of the grommet and the grommet mounting method according to the present invention described above are briefly summarized and listed in the following [1] to [5], respectively.
[1] A large-diameter cylindrical portion (11) having a panel engagement portion (12) engaged with the inner peripheral edge of the through hole (Pa) of the panel (P) on the outer periphery;
Two small-diameter cylindrical portions (13, 14) disposed on both sides of the large-diameter cylindrical portion (11) in the axial direction and tightly fitted to the outer periphery of the electric wire (W) passed through the through hole (Pa), respectively. ,
An outer peripheral edge is coupled to the large-diameter cylindrical portion (11) and an inner peripheral edge is coupled to the small-diameter cylindrical portion (13, 14), and the large-diameter cylindrical portion (11) and each small-diameter cylindrical portion (13, 14). Two connecting shielding walls (15, 16) that respectively shield the annular space between and
The large diameter cylindrical portion (11), the two small diameter cylindrical portions (13, 14), and the two connecting shielding walls (15, 16) form a grommet body (10), and the grommet body (10) is elastic. A grommet (1) made of material,
A sound insulating plate (30) formed separately from the grommet main body (10) and tightly fitted to the outer periphery of the electric wire (W) is disposed inside the grommet main body (10), thereby the grommet main body. A grommet (1) characterized in that the inside of (10) is partitioned into a plurality of sealed spaces (S1, S2).
[2] An annular fitting groove (20) is formed inside the grommet body (10), and an outer peripheral edge (31) of a sound insulating plate (30) integrated with the electric wire (W) in advance. The grommet according to the above [1], wherein the grommet body (10) is partitioned into the plurality of sealed spaces (S1, S2) by fitting into the fitting groove (20).
[3] The fitting groove (20) is provided at a position on the inner peripheral side corresponding to the panel engaging part (12) on the outer periphery of the large diameter cylindrical part (11). 2] The grommet (1).
[4] The above-mentioned [1], wherein a slit (33) that can be opened and closed from the outer peripheral edge (31) to the inner peripheral edge (32) is provided at one place in the circumferential direction of the sound insulating plate (30). ] To grommet (1) according to any one of [3].
[5] A method for attaching the grommet (1) according to [1] above,
Fitting the sound insulating plate (30) to the outer periphery of the electric wire (W);
Then, while the said electric wire (W) was inserted in the inside of the said grommet main body (10), the said sound insulation board (30) was diameter-expanded in the state which expanded one said small diameter cylinder part (14). Inserting into the inside of the grommet body (10) through the small diameter cylindrical portion (14);
The outer peripheral edge (31) of the sound insulating plate (30) is fitted into the annular fitting groove (20) on the inner circumference of the large-diameter cylindrical portion (11) of the grommet body (10), and back and forth. Engaging the panel engaging portion (12) on the outer periphery of the large diameter cylindrical portion (11) of the grommet body (10) with the inner peripheral edge of the through hole (Pa) of the panel (P);
A method of attaching the grommet (1), comprising:

DESCRIPTION OF SYMBOLS 1 Grommet 10 Grommet main body 11 Large diameter cylinder part 12 Panel engaging part 13,14 Small diameter cylinder part 15,16 Tapered cylindrical connection shielding wall 20 Fitting groove 30 Sound insulation board 31 Outer peripheral edge 32 Inner peripheral edge 33 Slit P Panel Pa Through Hole W Electric wire (wire harness)

Claims (5)

A large-diameter cylindrical portion provided on the outer periphery with a panel engaging portion that engages with the inner peripheral edge of the through hole of the panel;
Two small-diameter cylindrical portions that are arranged on both sides in the axial direction of the large-diameter cylindrical portion and are closely fitted to the outer periphery of the electric wire passed through the through-hole,
Two connecting shielding walls whose outer peripheral edge is coupled to the large diameter cylindrical portion and whose inner peripheral edge is coupled to the small diameter cylindrical portion and shields the annular space between the large diameter cylindrical portion and each small diameter cylindrical portion. And having
The large-diameter cylindrical portion, the two small-diameter cylindrical portions, and the two connecting shielding walls form a grommet main body, and the grommet main body is a grommet constituted by an elastic material,
A sound insulating plate formed separately from the grommet body and closely fitted to the outer periphery of the electric wire is disposed inside the grommet body, thereby partitioning the inside of the grommet body into a plurality of sealed spaces. Grommet. An annular fitting groove is formed inside the grommet body, and the inner periphery of the grommet body is formed by fitting the outer peripheral edge of a sound insulating plate integrated with the wire in advance into the fitting groove. The grommet according to claim 1, wherein the grommet is partitioned into a plurality of sealed spaces. The grommet according to claim 2, wherein the fitting groove is provided at a position on the inner peripheral side corresponding to the panel engaging groove on the outer periphery of the large-diameter cylindrical portion. The grommet according to any one of claims 1 to 3, wherein a slit that can be opened and closed from an outer peripheral edge to an inner peripheral edge is provided at one place in a circumferential direction of the sound insulating plate. A method for attaching a grommet according to claim 1,
Fitting the sound insulation board to the outer periphery of the wire;
Thereafter, the electric wire is inserted into the inside of the grommet main body, and the sound insulating plate is inserted into the grommet main body through the enlarged small diameter cylindrical portion in a state where one of the small diameter cylindrical portions is expanded. Process,
The outer peripheral edge of the sound insulating plate is fitted into the annular fitting groove on the inner circumference of the large-diameter cylindrical portion of the grommet body, and before and after that, the panel engaging portion on the outer circumference of the large-diameter cylindrical portion of the grommet body Engaging the inner peripheral edge of the through hole of the panel;
The grommet attachment method characterized by comprising.

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