JP2002152947A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely keep moisture proofness between a case and a wire, even if an unexpected force is applied, and to improve the moisture proof performance, without increasing the number of lip parts. SOLUTION: A wire is inserted through this grommet 33, extending from one side to the other side. The grommet 33 comprises an outer main part 51, which is coupled with a coupling part 41 formed on a box-type case 35 and has lip parts 76 and 76, formed on its outer circumferential surface and brought into tight contact with the inner circumferential surface 65 of the coupling part 41, and an inner body 53, which is fitted to the inside of the outer body 51 and keeps the coupling state between the outer body 51 and the coupling part 41. There is also provided a tight contact means 93 with which the one side or the other side of the outer body 51 and the coupling part 41 are brought into tight contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet in which an inner body is fitted to an outer body and assembled to a case.

[0002]

2. Description of the Related Art A conventional grommet is disclosed in
Japanese Patent Application Publication No. -150429 and those shown in FIGS. As shown in FIGS. 3 and 4, the grommet 1 has an electric wire inserted therein and is assembled to a box-shaped case 7 to waterproof the case 7 and the electric wire.

[0003] The case 7 comprises a box-shaped case body 3 having an upper opening, and a lid 5 for closing the opening of the case body 3. The case 7 has a fitting portion 9 formed therein. The fitting portion 9 includes an inner wall portion 21 and an outer wall portion 23 that support one side and the other side of the outer body 11 in a state where the outer body 11 described later is fitted thereto, and the inner wall portion 21.
And the outer wall portion 23, and a plurality of lip portions 15 are attached to the inner peripheral surface 3 in a state where the outer main body 11 described later is fitted.
And a peripheral wall portion 25 that is in close contact with 1.

The grommet 1 assembled to the case 7 has an outer body 11 fitted to the fitting portion 9 of the case 7, and an outer body 11 fitted to the inside of the outer body 11 and fitted to the fitting portion. And an inner main body 13 that holds the fitting state with the inner body 9. The outer main body 11 includes a plurality of lips 15, 15 formed along the outer peripheral surface, has an opening 17 on one side, and has a cylindrical portion 19 on the other side. An electric wire is inserted through the shape 19.

When assembling the grommet 1 to the case 7, first, the inner main body 13 is fitted inside the outer main body 11. Next, an electric wire is inserted into the outer main body 11 from the opening 17 to the cylindrical portion 19. At this time, in the outer main body 11, the inner peripheral surface of the tubular portion 19 is in close contact with the electric wire.

After that, the case body 3 and the lid 5 are assembled, and the outer body 11 is fitted to the fitting portion 9. At this time, the fitting portion 9 is such that the inner surface 27 of the inner wall portion 21 is in contact with one side of the outer body, the inner surface 29 of the outer wall portion 23 is in contact with the other side of the outer body 11, and the outer body 11 is connected to the inner wall portion 21. The lip portions 15, 15 of the outer main body 11 are in close contact with the inner peripheral surface 31 of the peripheral wall portion 25 while being supported by the outer wall portion 23.

Accordingly, the grommet 1 has a case in which the inner peripheral surface of the cylindrical portion 19 is in close contact with the electric wire and the space between the grommet 1 and the electric wire is waterproof, and the lip portions 15 and 15 are in close contact with the inner peripheral surface 31 of the peripheral wall portion 25. 7 is waterproofed, and as a whole, the space between the case 7 and the electric wires is waterproofed.

[0008]

However, in the conventional grommet 1 described above, when an inadvertent force is applied to the electric wire from the center of the grommet 1 to the outer periphery, the lip portions 15 and 15 are resilient by themselves. Deflected grommet 1
Was displaced from the center toward the outer periphery in the direction of the force as a whole.

In this case, the grommet 1 is released from the close contact state between the lip portions 15, 15 on the opposite side to the displacement direction and the peripheral wall portion 25, and the waterproof performance of the lip portions 15, 15 is reduced. There was something that could not be waterproof between.

Further, in the grommet 1, the water which has entered between the fitting portion 9 and the outer main body 11 is held between the lip portions 15, 15 to waterproof the space between the grommet 1 and the case 7. , 15 must be arranged with a predetermined pitch. For this reason, in the grommet 1, the lip portion 15,
In some cases, there was a limit in increasing the number of fifteen, and the waterproof performance could not be improved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a grommet which can reliably waterproof the case even when an external force is applied, and can improve the waterproof performance without increasing the number of lips. And

[0012]

In order to achieve the above object, according to the first aspect of the present invention, an electric wire is inserted from one side to the other side, and a fitting portion formed in a box-shaped case is provided. And an outer body that has a lip formed on the outer peripheral surface thereof and is in close contact with the inner peripheral surface of the fitting part, and an outer body and the fitting part that are fitted inside the outer body. A grommet including an inner body holding a fitted state, wherein the outer body is fitted to the fitting portion, and one or other side of the outer body and the fitting portion; Characterized in that it is provided with a contacting means for bringing the portions in contact with each other into close contact with each other.

According to the first aspect of the present invention, the inner body is fitted into the outer body, and the electric wire is inserted from one side of the outer body to the other side. Therefore,
When the outer body is fitted to the fitting portion of the case, the lip portion of the outer body comes into close contact with the inner peripheral surface of the fitting portion.

In the outer body, a portion in contact with the fitting portion on one side or the other side is closely attached to the fitting portion by a contacting means.

According to a second aspect of the present invention, there is provided the grommet according to the first aspect, wherein the fitting portion has an outer surface of an outer peripheral wall on one side of the outer body in a state where the outer body is fitted. An inner wall portion in contact with an inner side surface, and a peripheral wall portion in which the lip portion is in close contact with an inner peripheral surface in a state where the outer main body is fitted. A drawer that is drawn out from one side of the outer body in a state where the inner body is fitted to the outer body; and a drawer formed at the drawer, wherein the outer body fits into the fitting part. An engagement portion that engages with the outer surface of the inner wall portion when worn, and holds the outer wall of one side of the outer body and the inner wall portion of the fitting portion together with the inner body. It is characterized by having.

According to the second aspect of the present invention, when the outer body having the inner body fitted therein is fitted to the fitting portion of the case, the lip portion is formed on the inner peripheral surface of the peripheral wall portion. And the outer surface of one outer peripheral wall abuts the inner surface of the inner wall portion. At this time, the engaging portion is engaged with the outer surface of the inner wall portion, and the inner main body and the engaging portion sandwich the outer peripheral wall on one side of the outer main body and the inner wall portion of the fitting portion. For this reason, in the outer body, one outer peripheral wall outer surface is in close contact with the inner surface of the inner wall portion of the fitting portion.

According to a third aspect of the present invention, there is provided the grommet according to the second aspect, wherein the draw-out portion is formed in a cylindrical shape, and the engaging portion protrudes along an outer peripheral surface of the draw-out portion in a circumferential direction. The inner surface is formed in a brim shape which engages with the outer surface of the inner wall portion when the outer main body is fitted to the fitting portion.

According to the third aspect of the present invention, when the outer body having the inner body fitted therein is fitted to the fitting portion of the case, the inner surface of the brim-shaped engaging portion is provided. Engages with the outer surface of the inner wall.

According to a fourth aspect of the present invention, there is provided the grommet according to the third aspect, wherein at least one of the drawer portion and the engaging portion has flexibility, and a tip of the drawer portion has The outer main body is disposed at a position not exceeding the inner wall portion in a state where the outer main body is fitted to the fitting portion, and the engaging portion extends along an opening edge at a tip end of the drawing portion. .

According to the present invention, when the outer body, in which the inner body is fitted, is fitted to the fitting part of the case, the inner part of the drawer and the engaging part is formed. , At least one bends to engage the inner surface of the engagement portion with the outer surface of the inner wall portion by its own elasticity.

The invention according to claim 5 is the invention according to claim 3 or 4.
The grommet according to claim 1, wherein the inner wall portion has a slope on an outer surface of a tip, the engagement portion has a slope formed on an inner surface of the tip, and the outer main body is fitted to the fitting portion. In this state, the slope of the engagement portion is engaged with the slope of the inner wall portion.

According to the fifth aspect of the present invention, when the outer body in which the inner body is fitted is fitted to the fitting portion of the case, the engaging portion of the inner wall portion is formed on the slope of the inner wall portion. The slope engages.

According to a sixth aspect of the present invention, there is provided the grommet according to any one of the third to fifth aspects, wherein the drawer portion is configured such that the outer main body is fitted to the fitting portion.
A space is provided between the outer peripheral surface and a tip of the inner wall portion.

According to the sixth aspect of the present invention, when the outer body having the inner body fitted therein is fitted to the fitting portion of the case, the outer peripheral surface of the drawer portion and the inner wall portion are formed. A space is formed between the tip and the tip.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the grommet according to the present invention will be described. FIG. 1 is a sectional view showing a first embodiment of a grommet according to the present invention. FIG. 2 is a sectional view when the grommet shown in FIG. 1 is assembled to a case.

As shown in FIG. 1, the grommet 33 has an electric wire inserted therein and is assembled to a box-shaped case 35 to waterproof the space between the case 35 and the electric wire.

The case 35 is, as shown in FIGS.
It comprises a case body 37 having an upper opening, and a lid 39 for closing the opening of the case body 37. The case 35 has a fitting portion 41 formed therein. Fitting part 41
Is formed across the case body 37 and the lid 39,
When the case body 37 and the lid body 39 are assembled, an overall gutter is formed. The fitting portion 41 includes an inner wall portion 43 in which an inner side surface 71 abuts an outer side surface 67 of an outer peripheral wall 55 on one side of the outer main body 51 in a state where the outer main body 51 described later is fitted thereto. An outer wall portion 45 is provided at a predetermined outside position, and a peripheral wall portion 47 connecting the inner wall portion 43 and the outer wall portion 45 is provided.

The inner wall portion 43 is a plate-like body, and is formed by extending the outer peripheral wall of the lid 39 of the case 35 and the outer peripheral wall of the case body 37 respectively. The inner wall portion 43 projects toward the center with respect to an opening edge on one side of a peripheral wall portion 47 described later. The inner wall 43 has a slope 49 at the tip.

The inclined surface 49 is formed from the outer surface 72 to the distal end surface along the circumferential direction of the inner wall portion 43, and is formed so that the cross-sectional dimension of the inner wall portion 43 is gradually reduced toward the distal end.

The outer wall portion 45 is formed of a plate-like body and is disposed to face the inner wall portion 43.
At the opening edge on the other side, and the tip is formed toward the center side.

The peripheral wall portion 47 connecting the inner wall portion 43 and the outer wall portion 45 is formed of a cylindrical plate, and the outer main body 5 is fitted to the fitting portion 41 in a state where the outer main body 51 described later is fitted.
The first connection wall 59 is formed so as to cover the outer periphery thereof.

The grommet 33 assembled to the case 35 is, as shown in FIGS.
An outer body 51 fitted to the fitting portion 41 of the inner body 51; an inner body 53 fitted inside the outer body 51 to maintain a fitted state of the outer body 51 and the fitting portion 41; 53 and a contacting means 93 formed on the member 53.

The outer body 51 is a box-like body,
It is made of a soft synthetic resin material such as rubber. The outer main body 51 has one outer peripheral wall 55 supported by the inner wall portion 43 in a state of being fitted to the fitting portion 41, and another outer peripheral wall 57 disposed opposite to the one outer peripheral wall 55. And a connecting wall 59 connecting the outer peripheral walls 55 and 57 on one side and the other side,
An electric wire is inserted inside from one side to the other side. The outer peripheral wall 55 on one side is formed of a plate-like body and has an opening 6 at the center.
1 and has a brim-like shape protruding toward the center side along an opening edge on one side of a connecting wall portion 59 described later.

As described above, the outer peripheral wall 57 on the other side disposed opposite to the outer peripheral wall 55 on one side is formed of a plate-like body and has a through hole 63 penetrating from the inside to the outside at the center.
And has a brim-like shape protruding toward the center along the opening edge on the other side of the connecting wall portion 59 described later.

The connecting wall portion 59 connecting the outer peripheral wall 55 on one side and the outer peripheral wall 57 on the other side is formed in a cylindrical shape, and has an inner periphery of a peripheral wall portion 47 of the fitting portion 41 described later. It is formed according to the shape of the surface 65. This connecting wall 59 is
The circumferential dimension of the outer peripheral surface is formed slightly smaller than the circumferential dimension of the inner peripheral surface 65 of the peripheral wall portion 47. In addition, the connecting wall portion 59 connects the outer peripheral wall 55 on one side with the outer peripheral wall 57 on the other side.
The outer surfaces 67 and 69 are connected so that the dimension between them is approximately the same as or slightly smaller than the dimension between the inner surfaces 71 and 73 of the inner wall 43 and the outer wall 45 of the fitting portion 41. This connecting wall 59
Are provided along the circumferential direction of the outer peripheral surface.
6 are protrudingly provided. Further, a fitting portion 83 into which an inner body 53 described later is fitted is provided inside the outer body 51.

The fitting portion 83 is concave and has an inner surface 75 of the outer wall 55 on one side and an inner surface 7 of the outer wall 57 on the other side.
The inner body 53 is formed by the inner wall 7 and the inner peripheral surface 78 of the connecting wall 59, and accommodates the inner body 53 in a state where the inner body 53 is fitted. The outer body 51 described above is connected to the outer peripheral wall 57 on the other side.
A cylindrical portion 79 is integrally formed.

The cylindrical portion 79 has a long hollow shape.
It is provided along the opening edge of the through hole 63 formed in the outer peripheral wall 57 on the other side, and the tip protrudes outward from the other side of the outer main body 51. This tubular portion 79 has a plurality of annular ribs 81 formed along the circumferential direction of the inner peripheral surface,
With the electric wire inserted through the outer main body 51, the electric wire is pulled out from the distal end and the plurality of ribs 81, 81
Adhere to the outer peripheral surface of the electric wire.

The inner main body 53 fitted into the fitting portion 83 of the outer main body 51 formed as described above is formed of a plate made of a hard synthetic resin material as shown in FIGS. , Are formed according to the shape of the fitting portion 83 of the outer main body 51. The inner main body 53 has a cylindrical tubular wall 8.
5 and flanged wall portions 87 and 89 extending from one side and the other side of the cylindrical wall portion 85, respectively.

The cylindrical wall portion 85 is formed according to the shape of the inner peripheral surface 78 of the connecting wall portion 59 of the outer main body 51, and the circumferential dimension of the outer peripheral surface is defined by the outer peripheral surface of the inner peripheral surface 78 of the connecting wall portion 59. It is formed substantially the same as or slightly smaller than the dimension in the direction. The cylindrical wall portion 85 has brim-shaped wall portions 87 and 89 on one side and the other side, respectively.
Is provided.

The collar wall 87 on one side is formed in a collar shape and has an opening 90 in the center. This brim-shaped wall 8
Reference numeral 7 protrudes toward the center side along an opening edge on one side of a cylindrical wall portion 85 described later. In addition, the brim-like wall portion 87
In the state where the inner body 53 is fitted to the fitting portion 83 of the outer body 51, the outer surface 92 is entirely
One side of the outer peripheral wall 55 is in contact with the inner side surface 75 of the outer peripheral wall 55. The other brim wall portion 89 provided on the opposite side of the peripheral wall portion 47 with respect to the one brim wall portion 87 is formed in a brim shape, and has an opening on the other side of a cylindrical wall portion 85 described later. It protrudes toward the center along the edge. The collar wall 89 has an insertion hole 91 having substantially the same shape as the through hole 63 at a position corresponding to the through hole 63 of the outer main body 51. The brim-like wall portion 89 is formed so that the inner main body 53 is fitted to the fitting portion 83 of the outer main body 51.
The outer surface 94 contacts the inner surface 77 of the outer wall 57 on the other side as a whole.

When the inner body 53 is fitted in the fitting portion 83, the flanged wall portions 87 and 89 are formed on the inner side surfaces 75 of the outer peripheral walls 55 and 57 on one side and the other side of the outer body 51. ,
The inner main body 53 is supported by the respective motors 77 so as to prevent rattling.

As shown in FIGS. 1 and 2, the close contact means 93 formed on the inner main body 53 includes a drawer 95 integrally formed on the inner main body 53 and a drawer 95 formed on the inner main body 53.
And the engaging portion 97 formed at the bottom.

The draw-out portion 95 is formed in a long and flexible tube shape, and is provided along the opening edge of the opening 90 formed in the flange portion 87 on one side. The drawer 95 is provided so that the inner main body 53 is connected to the fitting portion 8 of the outer main body 51.
3, the distal end is pulled out from an opening 61 formed in the outer peripheral wall 55 on one side of the outer main body 51, and the outer main body 51 is fitted to the fitting portion 41. The fitting portion 41 is disposed slightly closer to the inner side surface 71 than the outer side surface 72 of the inner wall portion 43, and is formed so as not to exceed the inner wall portion 43. Further, when the inner body 53 is fitted to the fitting portion 83 of the outer body 51, the outer peripheral surface 99 is formed on the outer peripheral wall 55 on one side of the outer body 51.
And a space 101 is formed between the fitting portion 41 and the tip of the inner wall portion 43 in the entire circumferential direction. The drawer 95 is provided with an engaging portion 97 along the circumferential direction of the outer peripheral surface 99.
Is extended.

The engaging portion 97 is formed in a brim shape having flexibility, and protrudes outward from the outer peripheral surface 99 along the opening edge of the drawer portion 95. As shown in FIG. 2, when the inner body 53 is fitted to the fitting portion 83 of the outer body 51, the inner side surface 103 is formed on the outer side of the outer peripheral wall 55 on one side of the outer body 51. Fitting part 4 with the side surface 67
Forming a gap S ₁ of smaller dimension than the thickness of one of the inner wall 43. Further, the engaging portion 97 is provided with a slope 105 along the circumferential direction of the tip.

The slope 105 is formed on the inner surface 103 of the engagement portion 97.
From the front end surface. The slope 105 is formed so as to gradually reduce the cross-sectional dimension of the engaging portion 97 toward the tip. Further, the slope 105 is formed to have a dimension in the height direction larger than the height of the projections of the lip portions 76 and 76 from the connecting wall portion 59. This slope 105
The slope 49 formed on the inner wall 43 of the fitting portion 41 has an inclination angle.
And is formed substantially in parallel with the inclined surface 49. And the slope 105 is the inner body 53.
The outer body 51 fitted to the fitting portion 83 is
The slope 4 of the inner wall portion 43 is fitted to the fitting portion 41 of the inner wall portion 43.
9 is engaged.

When the grommet 33 thus formed is fitted to the fitting portion 41 of the case 35, first, the inner main body 53 is assembled to the outer main body 51. Next, an electric wire is inserted into the outer main body 51 to which the inner main body 53 is assembled. In this state, the outer body 51 is
1 is fitted.

When assembling the outer main body 51 to the inner main body 53, the outer main body 51 is bent in advance to expand the opening 61 formed in the outer peripheral wall 55 on one side of the outer main body 51. Then, the inner body 53 is inserted into the opening 61 of the outer body 51 from the other side, and the inner body 53 is fitted into the fitting portion 83 of the outer body 51. Then, the electric wire is inserted from the opening 90 of the inner main body 53 to the cylindrical portion 79 of the outer main body 51. In this state, the tubular portion 79 allows the wires to be drawn out from the distal end, and the ribs 81, 81 on the inner peripheral surface and the outer peripheral surface of the electric wire to be in close contact with each other, thereby waterproofing the space between the electric wire and the grommet 33. ing. Then, the outer body 51
Is fitted to the fitting portion 41 of the case 35.

When fitting the outer body 51 to the fitting portion 41, first, the outer body 51 is temporarily fitted to the fitting portion 41 on the case body 37 side. Next, the opening of the case body 37 is closed by the lid 39.

As shown in FIG. 2, the outer body 51 is temporarily fitted to the fitting portion 41 by fitting the outer peripheral walls 55 and 57 on the lower side of the outer body 51 to the case body 37 side. It is carried out by being supported by the inner wall 43 and the outer wall 45 of the attaching portion 41. Then, the opening of the case body 37 is closed by the cover 39 in a state where the outer body 51 is temporarily fitted to the fitting portion 41.

At this time, first, the outer main body 51 is fitted with the fitting portion 4 on the side of the lid 39 which closes the opening of the case main body 37.
1 is temporarily fitted in the upper part, and the outer body 5 is formed by the inner wall 43 and the outer wall 45 of the fitting part 41 on the lid 39 side.
The outer peripheral walls 55 and 57 on one side and the other side of the upper part of 1 are respectively supported. After that, the inner wall 43 on the side of the lid 39 is
The tip side of 9 abuts the tip side of the slope 105 of the upper engaging portion 97, and the slope 49 presses the slope 105 of the upper engaging portion 97. Therefore, the engaging portion 97 is bent out portion 95 and itself, the slope 105 is displaced in a direction to expand the clearance S ₁ as a whole in sliding contact along the inclined surface 49 of the inner wall 43.

When the slope 105 of the upper engaging portion 97 is pressed, the inner main body 53 moves downward as a whole, and moves the outer main body 51 downward. For this reason,
In the lower engaging portion 97, the front end side of the slope 105 abuts the front end side of the slope 49 of the inner wall 43 on the case body 37 side, and the slope 105 presses the slope 49 of the inner wall 43 on the case body 37 side. As a result, the lower engaging portion 97 is configured such that the inclined surface 105 receives the reaction force from the inclined surface 49 to bend the drawer portion 95 and itself, and the inclined surface 105 slides along the inclined surface 49 of the inner wall 43 on the case body 37 side. whole is displaced in a direction to expand the clearance S ₁ as.

Therefore, the opening of the case body 37 is
When it is completely closed, the outer book is closed as shown in FIG.
The body 51 is fitted to the fitting portion 41 of the case 35. This and
The lip portions 76 and 76 are tightly attached to the inner peripheral surface 65 of the peripheral wall portion 47.
Wear and the gap S₁Is S ₂And the inclination of the engaging portion 97
The surface 105 contacts the slope 49 of the inner wall 43 as a whole.
And an engagement portion between the inner wall portion 43 of the fitting portion 41 and the inner main body 53.
97 is engaged.

[0053] In this state, the engaging portion 97 tends to be displaced in a direction to reduce the clearance S ₂ as a whole by the elastic lead portion 95 and itself. For this reason, the slope 10 of the engagement portion 97
5 comes into close contact with the inclined surface 49 of the inner wall portion 43, and a force in the direction of arrow A is applied to the inner main body 53, and a flange-like wall portion 87 on one side
The outer surface 92 of the outer body 51 is in close contact with the inner surface 75 of the outer peripheral wall 55 on one side of the outer main body 51. As a result, the outer wall 55 and the inner wall 43 on one side of the outer body 51 are sandwiched between the inner body 53 and the engagement portion 97, and the outer surface 67 of the outer wall 55 and the inner wall 4 are sandwiched.
3 is brought into close contact with the inner side surface 71.

Therefore, the grommet 33 is connected to the outer body 5.
1 and the inner peripheral surface 65 of the peripheral wall portion 47 of the fitting portion 41 is in close contact with the outer surface 67 of the outer peripheral wall 55 on one side of the outer main body 51 and the inner wall portion 43 of the fitting portion 41. And the inside surface 71 of the case 35 is in close contact with the case 35 to waterproof it.

As described above, the grommet 33 of the present embodiment is used.
Then, the outer main body 51 is formed by the inner main body 53 and the engagement portion 97.
Between the outer peripheral wall 55 and the inner wall 43 on one side of the outer peripheral wall 5.
5 and the inner side surface 71 of the inner wall 43 are in close contact with each other. For this reason, careless force is applied to the electric wire, and the outer main body 51 is displaced in the fitting portion 41, and the lip portions 76, 76
Even when the state of close contact with the inner peripheral surface 65 of the peripheral wall portion 47 is released, the space between the case 35 can be reliably waterproofed.

In the grommet 33, the lip 7
Even if there is a limit in improving the waterproof performance by increasing the number of the outer and inner walls 51 and 76, the outer peripheral wall 5 on one side of the outer main body 51 may be used.
5 and the inner surface 71 of the inner wall 43 of the fitting portion 41
And the waterproof performance can be improved.

Further, in the grommet 33, the outer wall 5 on one side of the outer body 51 is formed by the inner body 53 and the engagement portion 97.
5 and the inner wall portion 43 are pinched, so that it can be securely fixed to the case 35.

In the grommet 33 of this embodiment,
Since the engaging portion 97 is formed in a brim shape, the engaging portion 97
Of the inner wall 103 is engaged with the entire outer surface 72 of the inner wall 43, and the outer surface 67 of the outer peripheral wall 55 on one side of the outer main body 51 and the inner surface 71 of the inner wall 43 of the fitting portion 41. Can be uniformly adhered as a whole, and stable waterproof performance can be obtained.

In the grommet 33, the inclined surface 105 of the engaging portion 97 engages with the inclined surface 49 of the inner wall portion 43 of the fitting portion 41, and engages with the inner main body 53 by the elasticity of the engaging portion 97 and the drawer portion 95. Outer wall 5 on one side of outer body 51 with portion 97
5 and the inner wall 43, and the outer surface 67 of the outer peripheral wall 55 and the inner surface 71 of the inner wall 43 are in close contact with each other.

For this reason, the grommet 33 applies a force in the direction of arrow A to the inner main body 53 and the outer surface 6 of the outer peripheral wall 55.
7 and the inner side surface 71 of the inner wall portion 43 can be more securely brought into close contact with each other to improve the waterproof performance.
Can be reliably maintained in the fixed state.

Since the grommet 33 forms the space 101 between the grommet 33 and the inner wall 43, the lip 76,
Even if water intrudes between the outer main body 51 and the fitting portion 41 beyond the space 76, the water can be retained by the space portion 101, and the waterproof performance can be further improved.

The waterproof performance of the existing grommet can be improved only by replacing the inner body 53 used for the grommet 33 of this embodiment with the inner body of the existing grommet.

In this embodiment, both the extraction portion 95 and the engagement portion 97 have flexibility, but either one of the extraction portion 95 and the engagement portion 97 has flexibility. You only need to have it.

The engaging portion 97 has a drawer portion 95 formed in a cylindrical shape and formed in a brim shape extending along the opening edge of the drawer portion 95. However, the drawer portion is formed in a rod shape. It may be formed in a claw shape extending from the tip of the drawer. In this case, a plurality of draw-out portions and engagement portions are provided along the opening edge of the opening 90 of the flange-shaped wall portion 87 on one side of the inner main body 53, and each engagement portion is provided outside the inner wall portion 43. Engage with side surface 72.

Further, the inner wall 43 of the fitting portion 41 is
9, the inclined portion 105 is provided on the engaging portion 97. However, the present invention can be applied to a case in which the inner wall portion 43 does not have the inclined surface 49. Good.

In the above embodiment, the grommet 33 is used.
Although the fitting portion 41 has the outer wall portion 45, the grommet 33 can be used in a case where the outer wall portion 45 is omitted.

[0067]

As described above, the first aspect of the present invention is:
The part of the outer body that is in contact with the fitting part on one side or the other side is tightly fitted to the fitting part by the contacting means, so that even if an inadvertent force is applied to the grommet, the grommet is securely waterproofed to the case. And the waterproof performance can be improved without increasing the number of lip portions.

According to a second aspect of the present invention, when the outer body, in which the inner body is fitted, is fitted to the fitting portion of the case, the engaging portion engages with the outer surface of the inner wall to form the inner body. The outer peripheral wall on one side of the outer main body and the inner wall of the fitting portion are sandwiched between the main body and the engaging portion. For this reason, the outer body is designed so that the outer surface of the outer peripheral wall on one side is in close contact with the inner surface of the inner wall portion of the fitting portion, so that even if an inadvertent force is applied to the grommet, the outer body is securely waterproofed. And the waterproof performance can be improved without increasing the number of lip portions.

According to a third aspect of the present invention, the inner surface of the brim-shaped engaging portion is engaged with the outer surface of the inner wall portion and the outer surface of the outer peripheral wall on one side of the outer main body and the inner wall portion of the fitting portion. The inner surface can be evenly brought into close contact with each other as a whole, and stable waterproof performance can be obtained.

According to a fourth aspect of the present invention, at least one of the drawer portion and the engaging portion is bent, and the inner surface of the engaging portion is engaged with the outer surface of the inner wall portion by its own elasticity. The outer surface of the outer peripheral wall on the side and the inner surface of the inner wall portion of the fitting portion are securely brought into close contact with each other, whereby the waterproof performance can be further improved, and the outer wall is fixed to the case.

According to the fifth aspect of the present invention, since the slope of the engaging portion is engaged with the slope of the inner wall, the outer surface of the outer peripheral wall on one side and the inner surface of the inner wall are more securely brought into close contact with each other. And can further improve the waterproof performance,
The fixed state to the case can be reliably maintained.

According to the sixth aspect of the present invention, water can be retained in the space, and the waterproof performance can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a grommet according to the present invention.

FIG. 2 is a sectional view when the grommet shown in FIG. 1 is assembled to a case.

FIG. 3 is a sectional view showing a state where a conventional grommet is assembled to a case.

FIG. 4 is an exploded perspective view of a grommet and a case shown in FIG. 3;

[Explanation of symbols]

 33 Grommet 35 Case 41 Fitting part 43 Inner wall part 47 Peripheral wall part 49 Slope of inner wall part 51 Outer body 53 Inner body 55 One outer wall 65 Inner peripheral surface of peripheral wall (inner peripheral surface of fitting part) 67 Outer side surface 71 inner side surface of inner wall portion 72 outer side surface of inner wall portion 76 lip portion 93 adhesion means 95 lead-out portion 97 engaging portion 99 outer peripheral surface of draw-out portion 101 space portion 103 inner surface of engaging portion 105 slope of engaging portion 105

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) H02G 3/38 H02G 3/28 FF Term (Reference) 3J040 AA01 AA13 BA01 EA01 EA16 FA05 HA15 5G361 AA06 AB09 AC04 AC11 AE01 5G363 AA01 BA02 CA06 CB08 DC02

Claims (6)

[Claims] An electric wire is inserted inside from one side to the other side, and is fitted to a fitting portion formed in a box-shaped case, and a lip portion formed on an outer peripheral surface is provided with the fitting portion. A grommet comprising: an outer main body that is in close contact with the inner peripheral surface of the outer main body; and an inner main body that is fitted inside the outer main body and holds a fitted state of the outer main body and the fitting portion. A grommet comprising: a grommet provided with a contact unit for bringing a portion where one side or the other side of the outer body is in contact with the fitting portion in a state where the outer body is fitted to the fitting portion. . 2. The grommet according to claim 1, wherein the fitting portion is configured such that an outer surface of an outer peripheral wall on one side of the outer body abuts on an inner surface in a state where the outer body is fitted. An inner wall portion, and a peripheral wall portion in which the lip portion is in close contact with an inner peripheral surface in a state in which the outer main body is fitted. A drawer portion that is pulled out from one side of the outer body in a state where the main body is fitted to the outer body, and formed in the drawer portion, and the outer body is fitted to the fitting portion when the outer body is fitted to the fitting portion. An engaging portion that engages with the outer surface of the inner wall portion and that holds the outer peripheral wall on one side of the outer main body and the inner wall portion of the fitting portion together with the inner main body is provided. Grommet. 3. The grommet according to claim 2, wherein the draw-out portion is formed in a cylindrical shape, and the engaging portion is provided on an outer peripheral surface of the draw-out portion along a circumferential direction, and the outer main body is provided. A grommet, wherein an inner surface of the grommet is formed into a collar that engages with an outer surface of the inner wall portion when the grommet is fitted to the fitting portion. 4. The grommet according to claim 3, wherein at least one of the drawer portion and the engaging portion has flexibility, and the tip of the drawer portion is fitted with the outer body. A grommet, wherein the grommet is arranged at a position not to exceed the inner wall portion in a state of being fitted to the attaching portion, and the engaging portion extends along an opening edge at a tip end of the drawing portion. 5. The grommet according to claim 3, wherein the inner wall portion has a slope on an outer surface of a tip, and the engaging portion has a slope formed on an inner surface of the tip, A grommet, wherein a slope of the engagement portion engages with a slope of the inner wall portion in a state where the main body is fitted to the fitting portion. 6. The grommet according to claim 3, wherein the outer peripheral surface and the inner wall of the grommet are in a state where the outer body is fitted to the fitting portion. A grommet, characterized in that the grommet is disposed with a space portion between the grommet and the tip of the portion.