JPH0963385A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve waterproofness of a grommet. SOLUTION: In a grommet which has an outer member 12 composed of an elastic material and an inner member 13 composed of a rigid material and is installed in a through hole by being installed on a wire harness W/H inserted into a through hole 5a composed of a burring hole arranged in a wall part 5, the outer member is formed in a shore cylinder shape whose one is set as the opening end 12b and other end is set as the closed end 12c, and a lip part 14 projecting outward in the radial direction is arranged on the whole periphery of the edge of the opening end, and an annular hole end contact part 15 projecting inward in the radial direction is arranged on the inner peripheral side. The inner member has a lip pressing-down part 19 to be fitted in a fitting groove 16 of the outer member by projecting outward in the radial direction on the whole periphery of an annular frame body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is attached to a wire harness which is inserted through a through hole provided in a wall portion of a vehicle body panel of an automobile to protect and waterproof the wire harness, and more particularly to an elastic material. The present invention relates to an improvement in waterproofness of a grommet including an outer member made of and an inner member made of a rigid material.

[0002]

2. Description of the Related Art Conventionally, various grommets have been proposed for protecting and waterproofing a wire harness when inserting the wire harness into a through hole formed in a wall portion of a vehicle body panel of an automobile or the like. As this type of grommet, there is, for example, one entirely made of an elastic material such as rubber. However, the grommet made of this elastic material has a problem that it cannot be easily attached to the through hole and is easily detached after attachment.

On the other hand, as shown in FIG. 8, there has been proposed a grommet 3 having an outer member 1 made of an elastic material and an inner member 2 made of a relatively hard material such as resin. (See Japanese Utility Model Laid-Open No. 59-25115) The outer member 1 has a waterproof function by closely adhering to a cylindrical small-diameter portion 1a which is in close contact with the outer periphery of the wire harness W / H and a wall portion 5 having a through hole 5a. And the annular lip portion 1b that fulfills the above condition, and the adhesive tape 6 is wound around the small diameter portion 1a and the outer circumference of the wire harness W / H projecting from the small diameter portion 1a to be attached and fixed to the wire harness W / H6. Also, the lip portion 1b on the inner peripheral side of the outer member 1
An annular fitting groove 1c is provided in the vicinity of.

On the other hand, the inner member 2 has a cylindrical portion 2a having a diameter larger than that of the wire harness W / H.
A flange-shaped lip pressing part 2b is provided at one end of a, and the inner member 2 is assembled to the outer member 1 by fitting the lip pressing part 2b into the fitting groove 1c of the outer member 1. In addition, the cylindrical portion 2a of the inner member 2 is provided with a pair of locking claws 2c, 2c,
By locking this locking claw 2c to the edge of the through hole 5a, the grommet 3 is attached and fixed to the through hole 5a.

In this grommet 3, if the inner member 2 assembled integrally with the outer member 1 is inserted into the through hole 5a, the wall member together with the outer member 1 is provided between the locking claws 2c, 2c and the lip pressing portion 2b. Since 5 is sandwiched, it can be easily attached to the wall portion 5. Further, when a force for pulling out the grommet 3 acts as shown by an arrow A in the figure, this force is supported by the locking claws 2c, 2c, so that it does not easily come off from the through hole 5a.

[0006]

However, in this grommet 3, the outer member 1 has the wall portion 5 only when the lip portion 1b indicated by B in the drawing is pressed against the wall portion 5 and is elastically deformed. Since it is in close contact with the wall portion 5, the lip portion 1b is rolled up by an external force or the like, and the wall portion 5 and the lip portion 1b are rolled up.
There may be a gap between them.

Further, in this grommet 3, a load F1 acts on the lip portion 1b which is elastically deformed by being pressed against the wall portion 5 as described above, and the lip portion serves as a reaction force of this load F1. A load F2 acts on the wall portion 5 from 1b. Therefore, as shown in FIG. 9, in the portion where the locking claw 2c of the cylindrical portion 2a is not provided, the inner member 2 is bent by the load F2, and the force with which the tip of the lip portion 1b is pressed against the wall portion 5 weakens. A gap may occur in the portion B. When a gap is formed between the lip portion 1b and the wall portion in this manner, water may enter from the outer X partitioned by the wall portion 5 to the inner Y via the through hole 5a, and the waterproofness may be deteriorated. . SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the conventional grommets, with the object of improving the waterproofness of the grommets.

[0008]

According to a first aspect of the present invention, there is provided a wire harness, comprising an outer member made of an elastic material and an inner member made of a rigid material, which is inserted into a through hole formed by a burring hole provided in a wall portion. The outer member has a short tubular shape with one end being an open end and the other end being a closed end, and the outer member projects radially outwardly along the entire circumference of the edge of the open end. And an annular hole end abutting portion projecting radially inward on the inner peripheral side, and an annular fitting groove is provided between the hole end abutting portion and the inside of the closed end. The inner member, which includes the formed large-diameter portion and the small-diameter cylindrical portion that closely contacts the outer periphery of the wire harness, is fitted in the fitting groove of the outer member so as to project radially outward over the entire circumference of the annular frame body. With a lip retainer,
The present invention provides a grommet including a locking claw for sandwiching a wall portion with the lip pressing portion.

According to a second aspect of the present invention, the grommet according to the first aspect is characterized in that a concave portion for locking the tip of the hole end contact portion of the outer member is provided on the outer periphery of the frame body of the inner member. It is provided.

According to a third aspect of the present invention, there is provided a grommet which is mounted on a wire harness which is inserted into a through hole of a wall portion and which is attached to the through hole. The grommet is made of an elastic material. The outer member having a large-diameter portion provided with an annular fitting groove in the vicinity of the side lip portion, and a small-diameter tubular portion in close contact with the outer periphery of the wire harness, and made of a rigid material, in the fitting groove of the outer member. (EN) A grommet provided with a lip pressing portion to be fitted therein and an inner member having locking pawls for sandwiching a wall portion with the lip pressing portion provided on the entire outer circumference.

According to a fourth aspect of the present invention, the locking claws are fixed locking claws for fixing and holding at least two inner members provided on the outer circumference of the inner member on the wall portion, and the outer circumference of the inner member. The grommet according to claim 3, wherein the grommet is an auxiliary locking claw which is provided in a portion where the locking claw for fixing is not provided and whose locking margin is set smaller than that of the locking claw for fixing. Is.

When the grommet according to the first aspect is attached to the through hole formed in the wall portion, the lip portion of the outer member is pressed against the wall portion to be in close contact, and the tip of the burring portion is in close contact with the hole end contact portion. So to speak, it becomes a double seal.

In the present invention, since the tip of the hole end abutting portion is locked to the concave portion of the inner member, the close contact between the lip portion and the wall portion and the burring portion and the hole end abutting portion. Has high adhesion.

In the grommet according to the third aspect, since the locking claw is provided on the outer periphery of the inner member, the load caused by the elastic bending of the lip portion pressed against the wall portion is the entire outer periphery of the inner member. Since it is supported by the locking claws provided in the inner member, the inner member is not bent by the load caused by the bending of the lip portion.

In the grommet according to a fourth aspect of the present invention, the locking allowance is provided on the outer periphery of the inner member other than the portion provided with the fixing locking claw for locking the inner member to the wall portion. Since the auxiliary locking claws that are set smaller than the locking allowance of are provided, these locking claws and auxiliary locking claws
A load due to elastic bending of the lip portion pressed against the wall portion is supported, and the inner member is not bent.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in detail based on the embodiments shown in the drawings. As shown in FIG. 1, the grommet 10 according to the present embodiment includes a plurality of electric wires 1
When the wire harness W / H formed by bundling 1 is inserted into the through hole 5a provided in the wall portion 5, the wire harness W / H is attached to the wire harness W / H and attached to the through hole 5a. The inner member 13 assembled to the outer member 12 is provided. In the present embodiment, the through hole 5a is a burring hole, and an annular cut-and-raised portion (burring portion 5b) is formed around the through hole 5a.

The outer member 12 is made of an elastic material such as rubber or elastomer and has a conical tubular shape as a whole as shown in FIGS. An insertion hole 12a to be inserted is provided in the axial direction.

Further, the outer member 12 is provided with a short cylindrical large-diameter cylindrical portion 12d having an open end 12b at one end and a closed end 12c at the other end. The large-diameter cylindrical portion 12d is provided with the bellows-like cylindrical portion 12d.
e, the conical cylindrical portion 12f, the small-diameter cylindrical portion 12g, and the tongue-shaped portion 1
2h are provided in series in the axial direction.

In the large-diameter cylindrical portion 12d of the outer member 12, the diameter of the through hole 12a is set larger than the outer diameter of the wire harness W / H so that the wire harness W / H can be loosely inserted. . In addition, an elliptical annular lip portion 14 that projects radially outward is provided on the entire circumference of the edge of the large-diameter cylindrical portion 12d on the side of the open end 12b. This lip part 1
4, the wall thickness t1 is gradually reduced from the base end portion 14a side toward the tip end portion 14b side, as shown in FIG. Also,
On the inner peripheral side of the large-diameter cylindrical portion 12d, there is provided an elliptical annular hole end abutting portion 15 which projects radially inward from the vicinity of the base end portion 14a of the lip portion 14. This hole end contact portion 15
Has a constant thickness from the base end portion 15a side to the tip end portion 15b and has a rectangular cross-sectional shape. A fitting groove 16 formed of an elliptical annular groove having a constant groove width is formed between the closed end 12b and the hole end contact portion 15.

The bellows-shaped cylindrical portion 12e is bendable, and the wire harness W / H is inserted in a loosely inserted state. The conical cylindrical portion 12f has a large diameter on the side of the bellows-shaped cylindrical portion 12e, and the diameter thereof is gradually reduced toward the small diameter cylindrical portion 12g. In the small diameter tube portion 12g, the diameter of the insertion hole 12a is set to be slightly smaller than the outer diameter of the wire harness W / H, and the small diameter tube is provided on the outer periphery of the wire harness W / H inserted in the insertion hole 12a. The part 12g is tightly and elastically tightened. The tongue 12h is
The small-diameter cylindrical portion 12g has a shape obtained by dividing the small-diameter cylindrical portion 12g in two in the radial direction, and has a semicircular cross-sectional shape. An adhesive tape 17 is wrapped around the tongue-shaped portion 12h and the wire harness W / H projecting from the tongue-shaped portion 12h. The adhesive tape 17 causes the outer member 12 to cover the wire harness W / H.
It is fixed at H.

The inner member 13 is made of a relatively hard material (rigid material) such as polypropylene or polyurethane resin, and as shown in FIGS. 4A and 4B, a pair of linear frame portions 13a parallel to each other. , 13a and semi-circular frame portions 13b, 13b connecting the linear frame portions 13a, 13a with each other, and the wire harness W / H is provided at the center.
An insertion hole 13c for loosely inserting is formed.

Further, the inner member 13 has an elliptical annular lip holding portion 19 which projects radially outwardly over the entire circumference of the linear frame portions 13a, 13a and the semicircular frame portions 13b, 13b.
Is provided. As shown in FIG. 7, the lip pressing portion 19 has a constant thickness from the base end portion 19a side to the tip end portion 19b side, and has a rectangular cross-sectional shape. The thickness of the lip pressing portion 19 is set to be substantially equal to the groove width of the fitting groove 16 of the outer member 12.

U-shaped cuts 20a and 20b are provided in the vicinity of both ends of the linear frame portion 13a of the inner member 13, and a portion surrounded by the cuts 20a and 20b is a locking pawl 2 for fixing.
1a and 21b are formed. This fixing claw 21
a and 21b have a shape as shown in FIG.
It is a rectangular plate-like body that bends with the base end portion 22 corresponding to the tip end side of a, 20b as a fulcrum. The fixing claws 21a and 21b
Has a thickness t2 gradually increasing from the base end portion 22 side toward the tip end portion 23 side, and an end surface on the tip end portion 23 side constitutes a locking surface 24 that abuts on the wall portion 5.

A linear auxiliary locking claw 26 is provided in a space between the locking locking claws 19a and 19b of the pair of linear frame portions 13a and 13a. The auxiliary locking claw 26 is provided with the notch 20 for forming the locking 21a, 21b for fixing.
formed between a and 20b, as shown in FIG.
The thickness t3 is gradually increased from the tip of the inner member 13 on the insertion direction side into the through hole 5a to the other end side, and the end surface on the other end side abuts the wall portion 5 Face 27
Is composed.

On the other hand, the pair of semicircular frame portions 13b, 13b.
The arc-shaped auxiliary locking claws 29a, 29b, 29c, 2
9d is provided. These auxiliary locking claws 29a to 29d are
Straight cuts 30a, 30b, 30c and cuts 19a, 19 for forming the fixing holding claws 21a, 21b.
It has an arc shape partitioned by b. Auxiliary locking claw 29a ~
The cross-sectional shape of 29d is the same as that of the linear frame portion 13a shown in FIG.
It has the same shape as the auxiliary locking claw 26 formed on 13b.

The tips of the engaging surfaces 24 of the fixing engaging claws 21a, 21b are the amount of the engaging margin E1 rather than the edge of the through hole 5a formed in the wall portion 5 shown by the one-dot chain line R in FIG. It is located on the outside, and the locking surface 24 corresponds to the locking margin E1.
Abut. On the other hand, the auxiliary locking claws 26, 29a-2
The locking surface 27 of 9d is the through hole 5a shown by the one-dot chain line R.
It is located outside of the edge by the amount of the locking margin E2,
The locking surface 27 contacts the wall portion 5 by the amount of the locking margin E2. In the present embodiment, the inner member 1 in which the locking margin E1 of the fixing locking claws 21a and 21b is fitted into the outer member 12 inside.
3 is set large enough so that it can be maintained in the state of being attached to the through hole 5a, while the auxiliary locking claws 26, 2 are provided.
The locking margin E2 of 9a to 29d is set to be small enough to support the load F2 that the lip portion 14 of the outer member 12 elastically deforms. Therefore, the locking margin E2 of the auxiliary locking pawls 26, 29a to 296d is smaller than the locking margin E1 of the fixing locking pawls 19a, 19b.

As described above, in this embodiment, the inner member 13 is provided with the fixing locking claws 21a and 21b, and
Auxiliary locking claws 26, 29a to 29d are provided in the portions of the inter member 13 where the fixing locking claws 21a, 21b are not provided, and the locking claws are provided on the entire outer circumference of the elliptical annular inner member 13. .

Linear frames 13a, 13 of the inner member 13
A concave portion 33 having a rectangular cross section is provided adjacent to the lip pressing portion 19 at the portion where the auxiliary locking claws 26, 29a to 29d are provided on the inner peripheral side of the a and the semicircular frame bodies 13b, 13b. . The recessed portion 33 accommodates the hole end contact portion 15 of the outer member.

The inner member 13 is the outer member 1
2 is fitted in the large-diameter cylindrical portion 12d, the lip pressing portion 19 of the inner member 13 is fitted in the fitting groove 16 of the outer member 12, and the lip pressing portion 19 and the fitting groove 1 are fitted.
Due to the engagement of 6, the inner member 13 becomes the outer member 12
It is assembled as a unit. In this state, as shown in FIG. 7, the tip end portion of the hole end contact portion 15 of the outer member 12 is housed in the concave portion 33 of the inner member 13.

After the grommet of this embodiment is mounted on the wire harness W / H, the inner member 13 is inserted into the through hole 5a formed in the wall portion 5 as shown by an arrow C in FIG. The claws 21a and 21b bend inward in the radial direction indicated by an arrow D in FIG. 5 with the base 20 as a fulcrum. At this time, the auxiliary locking claws 26, 29a to 29d also move in the direction of arrow D in FIG.
It bends inward in the radial direction. Locking claws 21a, 21b for fixing
And the locking surfaces 24, 2 of the auxiliary locking claws 26, 29a to 29d
When the portion 7 passes through the wall portion 5, the fixing locking claws 21a,
21b and the auxiliary locking claws 26, 29a to 29d return to their original shapes. At this time, as shown in FIG. 1, the burring portion 5b of the through-hole 5a, together with the hole end contact portion 15 of the outer member 12, the locking surface 2 of the locking hooks 21a, 21b for fixing.
The inner member 13 and the outer member 12 into which the inner member 13 is fitted are attached and fixed to the through hole 5a by the holding force. Further, the burring portion 5b of the through hole 5a, as shown in FIG. 7, together with the hole end abutting portion 15 of the outer member 12, the locking surfaces 27 of the auxiliary locking claws 26, 29a to 29d and the lip pressing portion 2 are provided.
It is sandwiched between 8.

As described above, the grommet 10 is inserted through the through hole 5a.
In the state of being attached to, the lip portion 14 of the outer member 12 is pressed against the wall portion 5, elastically bends and is in close contact with the wall portion 5, and the airtightness is obtained at this portion E.
In addition, the burring portion 5b of the through hole 5 has the outer member 1
Locking claws 21a, 21b for fixing together with the hole end contact portion 15 of FIG.
And the locking surfaces 24, 2 of the auxiliary locking claws 26, 29a to 29d
7 and the lip pressing portion 19, the tip of the burring portion 5b is pressed against the hole end contact portion 15 of the outer member 12. Therefore, airtightness can be obtained even in the portion G where the tip end of the burring portion 5b and the hole end contact portion 15 of the outer member 12 are in contact with each other. As described above, in this embodiment, the wall portion 5 and the outer member 12 made of an elastic material are in close contact with each other at the two portions of the portion E and the portion G.

Further, since the tip end portion of the hole end abutting portion 15 of the outer member 12 is housed in the concave portion 33 of the inner member 13, the wall portion 5 indicated by the arrow H in FIG. 7 acts on the lip portion 14. Even when a large force is applied, the hole end contact portion 15
Is not displaced in the direction indicated by arrow I and separated from the lip pressing portion 1.

Furthermore, when the grommet 10 of this embodiment is attached to the through hole 5a, the lip portion 14 of the outer member 12 is elastically bent and in close contact with the wall portion 5, and the lip portion 14 has The load F1 acts. A load F2 acts on the wall 5 from the lip 14 as a reaction force of the load F1. In the present embodiment, since the auxiliary locking claws 26, 29a to 29d are provided in the portions where the fixing locking claws 21a and 21b are not provided as described above, as shown in FIG. Is locked by the locking surface 27 of these auxiliary locking claws 26, 29a to 29d,
The inner member 13 does not bend due to the load F2, and the gap between the lip portion 14 and the wall portion 5 that occurs in the conventional grommet shown in FIGS. 8 and 9 does not occur. On the other hand, in the portion where the fixing locking claws 21a and 21b are provided, the load F2 is applied to the fixing locking claws 21a and 2b.
It is locked by the locking surface 24 of 1b, and the inner member 12 does not bend even in this portion to cause a gap.

As described above, in the grommet of this embodiment,
Since the auxiliary locking claws 24, 26a to 26d are provided in the portions where the fixing locking claws 19a and 19b are not provided, the load F2 generated by the bending of the lip portion 14 of the elastic outer member 12 causes It is possible to prevent the inner member 13 from bending, and this bending causes the lip 1
No gap is generated at the portion E where the wall 4 and the wall 5 contact each other. Therefore, in the present embodiment, the above-mentioned part E and part G
High adhesion can be obtained, water can be surely prevented from entering from the outside X to the inside Y of the wall portion 5 through the through hole 5a, and the waterproofness is excellent.

In the grommet of this embodiment, the locking margin E2 of the auxiliary locking claws 24, 26a to 26d is set smaller than the locking margin E1 of the fixing locking claws 19a, 19b. Even though the locking claws are provided on the entire outer circumference of the inner member 13, the inner member 13 can be easily attached to the through hole 5a with a relatively small force.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, at least two fixing claws may be provided, and the number of auxiliary locking claws is not limited to that in the above embodiment, and the fixing claws of the inner member may be It suffices if it is provided on almost the entire portion not provided.

[0037]

When the grommet according to the first aspect is attached to the through hole formed in the wall portion, the lip portion of the outer member is pressed against the wall portion and closely adheres thereto, and the tip of the burring portion is brought into contact with the hole end portion. Since they come into close contact with each other and are in a so-called double-sealed state, high waterproofness can be obtained.

In the second aspect, since the tip of the hole end contact portion is locked to the concave portion of the inner member, the close contact between the lip portion and the wall portion and the burring portion and the hole end contact portion. The adhesiveness is high, and the waterproof property can be further improved.

In the grommet according to the third aspect, since the locking claw is provided on the outer circumference of the inner member, the load caused by the elastic deformation of the lip portion pressed against the wall portion is the entire outer circumference of the inner member. Since it is supported by the locking claws provided on the inner side, it is possible to prevent the inner member from bending due to the load caused by the bending of the lip portion. Therefore, in the grommet according to the first aspect, it is possible to prevent the occurrence of a gap between the lip portion and the wall portion due to the bending of the inner member, and it is possible to improve waterproofness.

In the grommet according to a fourth aspect of the invention, the locking margin is locked by the locking locking claws other than the portion provided with the locking locking claws for locking the outer periphery of the inner member to the wall portion. Since the auxiliary locking claws are set smaller than the allowance, the load due to the elastic bending of the lip pressed against the wall is supported by these fixing locking claws and auxiliary locking claws. Therefore, the inner member can be prevented from bending. Therefore, in the grommet according to the second aspect, it is possible to prevent the occurrence of a gap between the lip portion and the wall portion due to the bending of the inner member, and it is possible to improve waterproofness. Further, in the grommet according to claim 4, since the locking margin of the auxiliary locking pawl is set to be smaller than the locking margin of the fixing locking pawl, the inner member is relatively easily inserted into the through hole. be able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a wire harness is inserted into a through hole using a grommet according to an embodiment of the present invention.

2A is a plan view showing an outer member, FIG.
FIG. 3A is a partial cross-sectional view taken along line II-II of (A).

FIG. 3 is an enlarged view of part III in FIG. 2 (B).

FIG. 4A is a plan view showing an inner member, and FIG.
FIG. 4 is a side view showing an inner member.

5 is a partial enlarged cross-sectional view taken along line VV of FIG. 4 (B).

6 is a partially enlarged cross-sectional view taken along line VI-VI of FIG. 4 (B).

FIG. 7 is an enlarged cross-sectional view of a main part of the embodiment.

FIG. 8 is a sectional view showing an example of a conventional grommet.

FIG. 9 is a partially enlarged cross-sectional view for explaining the problem of the conventional grommet.

[Explanation of symbols]

 12 Outer member 13 Inner member 14 Lip part 15 Hole end contact part 16 Fitting groove 19 Lip holding part 21a, 21b Fixing locking claw 26, 29a-29d Auxiliary locking claw

Front Page Continuation (72) Inventor Nobuhiro Takada 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd.

Claims (4)

[Claims] 1. A grommet which is equipped with an outer member made of an elastic material and an inner member made of a rigid material, and which is attached to a wire harness which is inserted into a through hole made of a burring hole provided in a wall and which is attached to the through hole. The outer member has a short tubular shape with one end being an open end and the other end being a closed end, and a lip portion projecting radially outward is provided on the entire circumference of the edge of the open end, and A large diameter portion in which an annular hole end abutting portion that projects inward in the radial direction is provided, and an annular fitting groove is formed between the hole end abutting portion and the inner portion of the closed end; The inner member is provided with a small-diameter cylindrical portion that is in close contact with the outer periphery of the outer frame, and the inner member includes a lip pressing portion that projects radially outwardly over the entire circumference of the annular frame body and is fitted into the fitting groove of the outer member. Locking to hold the wall part between the holding part Grommet, characterized in that it comprises a. 2. The grommet according to claim 1, wherein a concave portion for locking the tip of the hole end contact portion of the outer member is provided on the outer periphery of the frame of the inner member. 3. A grommet which is attached to a wire harness which is inserted into a through hole of a wall portion and which is attached to the through hole, and which is made of an elastic material and is provided with a lip portion on the entire circumference of an end edge, and a lip on the inner circumference side. Outer member having a large-diameter portion having an annular fitting groove near the portion and a small-diameter cylinder portion closely contacting the outer circumference of the wire harness; and a lip made of a rigid material and fitted into the fitting groove of the outer member. A grommet provided with a pressing portion and an inner member having locking claws for sandwiching a wall portion between the pressing portion and the lip pressing portion provided on the entire outer circumference. 4. The locking claw is a locking claw for fixing and holding at least two inner members provided on the outer periphery of the inner member on a wall portion, and a fixing member for fixing the outer periphery of the inner member. The grommet according to claim 3, wherein the grommet is an auxiliary locking claw which is provided in a portion where the stop claw is not provided and whose locking margin is set smaller than that of the fixing locking claw.