JP2021106461A - Grommet - Google Patents

Abstract

To provide a grommet capable of obtaining an excellent click feeling in a simple form.SOLUTION: A grommet comprises: a truncated cone-shaped base part 12 in which an inner diameter is gradually decreased; a penetration-like pipe part 18 which is provided to a small diameter side of the base part 12, and whose both ends are opened; an anti-falling-out part 14 which is provided to a large diameter side of the base part 12 to prevent it from being fallen by being engaged to a front surface of a panel; a panel engagement groove 16 which is provided between an end part of the large diameter of the base part 12 and the anti-falling-out part 14, and to which an inner peripheral edge of a penetration hole is engaged; and a push-in part 20 which is provided to an inner side of the base part 12, and is pressed when it is attached to a penetration hole 50a of the panel 50. When pressing the push-in part 20 to be attached to the penetration hole 50a of the panel 50, it is formed so that a volumetric distortion of the base part 12 becomes 0.3 or larger.SELECTED DRAWING: Figure 4

Description

The present invention relates to grommets attached to through holes formed in panels.

Vehicles such as automobiles, ships, and various vehicles such as aircraft are partitioned into a plurality of spaces by panels formed of steel plates and the like, and are partitioned by wire harnesses and various pipes through through holes formed in the panels. The equipment placed in the space is connected to each other. When a wire harness or the like is passed through the through hole of the panel, a grommet formed of an elastic body such as rubber is attached to the through hole to prevent damage due to contact with the edge of the through hole and to penetrate the through hole. It is designed to prevent sound, water, dust, etc. from entering through the holes. For example, in a vehicle such as an automobile, a grommet is attached to a through hole formed in a vehicle body panel such as a dash panel that separates the passenger compartment from the engine room, and a battery is installed as a power supply source in the engine room by a wire harness inserted through the grommet. Is connected to various electric devices placed on the passenger compartment side.

Here, if the grommet is attached to the through hole of the panel in an abnormal state, a problem such as the grommet falling out of the through hole may occur due to vibration or the like generated in the attachment target of a vehicle or the like. For this reason, a device has been proposed so that it is possible to grasp whether the grommet is normally attached to the panel. For example, the grommet of Patent Document 1 is used when the grommet is attached to the panel by providing a moderation-sensing protrusion on a small-diameter annular portion that passes through the through hole of the panel and forms the edge of the peripheral groove into which the through hole is fitted. , The insertion resistance that increased when the moderation sensation protrusion passed through the through hole together with the small diameter annular part suddenly disappeared when it was fitted into the through hole, and it was possible to feel that the grommet was normally attached. I am trying to do it.

Japanese Patent No. 6490448

However, in the configuration in which the moderation protrusion is provided on the grommet as in Patent Document 1, a large resistance is generated when the moderation protrusion passes through the through hole, and the insertion load into the through hole becomes excessive, resulting in an excessive work load. It becomes excessive. Further, since the moderation protrusion is separately molded, the mold shape tends to be complicated, which causes an increase in manufacturing cost.

That is, an object of the present invention is to provide a grommet having a simple shape and a good sense of moderation.

In order to overcome the above-mentioned problems and achieve the intended purpose, the invention according to claim 1 of the present application is:
A grommet made of elastic rubber and attached to the through hole of the panel.
A frustum-shaped substrate whose inner diameter gradually shrinks,
A penetrating tube portion provided on the small diameter side of the substrate portion and having both ends open,
A retaining portion provided on the large diameter side of the substrate portion and engaged with the surface of the panel to prevent it from coming off.
A panel engaging groove provided between the large-diameter end portion of the base portion and the retaining portion and with which the inner peripheral edge of the through hole engages.
A push-in portion provided inside the base portion and pushed into the through hole of the panel is provided.
It is a gist that the volume strain of the base portion is formed to be 0.3 or more when the push-in portion is pushed in and attached to the through hole of the panel.
In this way, by setting the volume distortion of the base portion to be 0.3 or more when it is attached to the through hole of the panel, it is possible to cause a sudden resistance change when the base portion passes through the through hole. It is possible to obtain a certain feeling that the panel is fitted in the panel engaging groove, that is, a good feeling of moderation. Further, since the inner peripheral edge of the through hole is engaged with the panel engaging groove and the grommet is attached to the panel only by passing the base portion through the through hole of the panel, the entire grommet can be made into a simple shape, and the panel can be formed. It is possible to suppress an increase in the insertion load at the time of attachment to.

The invention according to claim 2 is
The gist is that the push-in portion is formed so that the distance in the push-in direction from the large-diameter end portion inserted into the through hole of the panel in the base portion to the push-in surface is in the range of -1 mm to +5 mm. And.
In this way, by forming the pushing portion so that the distance in the pushing direction from the end portion on the large diameter side of the base portion to the pushing surface is in the range of -1 mm to +5 mm, the base when attached to the through hole of the panel is formed. A good sense of moderation can be obtained by setting the volume distortion of the portion to 0.3 or more.

The invention according to claim 3 is
The gist is that the base portion is made of elastic rubber having a hardness in the range of 50 to 80 based on JIS K6253.
In this way, by forming the base portion with elastic rubber having a hardness in the range of 50 to 80, the volume distortion of the base portion when attached to the through hole of the panel can be set to 0.3 or more, which is good. A feeling of moderation can be obtained.

According to the present invention, a good sense of moderation can be obtained with a simple shape.

It is the schematic of the vehicle which attached the grommet which concerns on this invention. (a) is a side view of the grommet according to the embodiment, (b) is a vertical cross-sectional view of the grommet, and (c) is an enlarged cross-sectional view of a main part of the grommet. (a) is a side view of the connecting pipe according to the embodiment, and (b) is a vertical cross-sectional view of the connecting pipe attached to the grommet. It is explanatory drawing which shows the mounting process of the grommet to a panel, (a) shows the state which the outer peripheral surface of a base part was in contact with the edge of the through hole of a panel, (b) is the opening of the through hole by pushing the grommet. The state in which the annular end of the substrate is in contact with the edge is shown, and (c) shows the state in which the grommet is attached to the panel. It is explanatory drawing which shows the relationship between a grommet and a panel in a state which omits a connecting tube, and shows the state which pushed the grommet which contacted the outer peripheral surface of the base part with the edge part of the through hole of a panel by a pushing force F.

Next, the grommet of the present invention will be described below with reference to the accompanying drawings. In the present embodiment, a grommet attached to a through hole provided in a vehicle panel of a fuel cell vehicle that generates electricity by a chemical reaction between hydrogen and oxygen to drive an electric motor will be described as an example.

(Example)
As shown in FIG. 1, the grommet 10 is integrally molded with elastically deformable elastic rubber such as EPDM rubber, and is in front of the vehicle in which an electric motor provided in front of the passenger compartment HR of the automobile MT is installed. It is used by being attached to the through hole 50a of the panel 50 that separates the motor room MR and the inside of the storage chamber HR of the fuel cell BAT. Further, a connection pipe 30 for relaying and connecting a hose for discharging gas to the fuel cell (not shown) is attached to the grommet 10, and a hose on the MR side of the motor room and a hose on the HR side of the accommodation room are connected to each other. By connecting to the pipe 30 and relaying, the gas generated in the fuel cell BAT at the time of heat generation can be released to the outside of the storage chamber HR.

As shown in FIG. 2, the grommet 10 is formed to have a larger diameter than the through hole 50a of the panel 50 and the base portion 12 formed so as to be able to pass through the through hole 50a of the panel 50 with elastic deformation. A groove-shaped panel engaging groove 16 provided between the base portion 12 and the retaining portion 14 and capable of engaging the inner peripheral edge of the through hole 50a of the panel 50, and a retaining portion 14 that cannot pass through the hole 50a. A penetrating tube portion 18 is provided so as to be located on the opposite side of the panel engaging groove 16 with respect to the base portion 12 and has through holes 18a formed at both ends. Specifically, the base portion 12 is formed so as to be inclined in a truncated cone shape in which the inner diameter gradually expands, and the retaining portion 14 is provided so as to be connected to the end portion on the large diameter side via the panel engaging groove 16. There is. Then, a penetrating tube portion 18 is formed at the end portion of the substrate portion 12 on the small diameter side, and the through hole 18a of the penetrating tube portion 18 is opened inside and outside the base portion 12. As described above, the grommet 10 has a funnel shape due to the base portion 12 and the penetrating tube portion 18. In the following, the formation side of the penetrating tube portion 18 of the grommet 10 may be described as the front side, and the opening side of the base portion 12 on the large diameter side may be described as the rear side.

Here, the outer peripheral edge of the large-diameter end of the base portion 12 (hereinafter, may be referred to as an annular end 12b) is formed so as to have a diameter larger than that of the through hole 50a of the panel 50, and the panel is engaged. The outer peripheral edge of the groove 16 is formed so as to have a diameter smaller than that of the annular end portion 12b and a diameter slightly larger than that of the through hole 50a. That is, as shown in FIG. 4, the small diameter side (through tube portion 18) of the base portion 12 is made to face the through hole 50a from one side of the panel 50 (for example, the motor room MR side), and the base portion 12 is inclined. By pushing the outer peripheral surface 12a in contact with the edge portion of the through hole 50a, the base portion 12 passes through the through hole 50a with the overall elastic deformation of the grommet 10 including the base portion 12. Then, when the base portion 12 passes through the through hole 50a, the inner peripheral edge of the through hole 50a is engaged with the panel engaging groove 16, and the panel 50 is between the annular end portion 12b of the base portion 12 and the retaining portion 14. The grommet 10 is attached to the panel 50 so as to be sandwiched between the two. By attaching the grommet 10 to the through hole 50a of the panel 50 in this way, the hose is protected from the edge of the through hole 50a of the panel 50, and water, dust, etc. enter through the through hole 50a. Is being prevented.

Further, as shown in FIG. 2B, the grommet 10 is provided with a pushing portion 20 that allows the grommet 10 to be pushed into the through hole 50a of the panel 50 from the inside of the base portion 12. The pushing portion 20 is provided inside the base portion 12 at the end portion on the small diameter side of the base portion 12 in a cylindrical shape that communicates with the through hole 18a of the penetrating tube portion 18. That is, a continuous through hole 18a is formed by the penetrating tube portion 18 and the pushing portion 20. Here, the distance between the pushing surface 20a forming the rear end surface of the pushing portion 20 and the base portion 12 is formed to be constant over the entire circumference of the pushing portion 20, and when the grommet 10 is attached to the panel 50. In addition, when the pushing surface 20a of the pushing portion 20 is pushed forward with the penetrating tube portion 18 facing the through hole 50a, the base portion 12 addressed to the edge portion of the through hole 50a is opposed to the base portion 12. The force is applied almost evenly so that the entire substrate portion 12 can be elastically deformed. Here, as shown in FIG. 2C, the base portion 12 is provided with a wall-thick portion 12c at a position where the base portion 12 is connected to the push portion 20 (the base end portion of the push portion 20). That is, by providing the thick portion 12c at the position where the base portion 12 is connected to the push-in portion 20, the elastic deformation of the base portion 12 inward is suppressed, and the elastically deformed base portion 12 is elastically deformed to its original shape. It is easy to return to.

Further, as shown in FIG. 3, the connecting pipe 30 attached to the grommet 10 is provided with a pipe body 32 having through holes 32a formed along the longitudinal direction and end portions of the hose provided at both ends of the pipe body 32. It is provided with a locking claw portion 38 to be inserted into. The locking claw portion 38 is formed in a tapered shape that is inclined so as to be separated from the outer peripheral surface of the tubular body 32 from the end portion of the tubular body 32 provided with the locking claw portion 38 toward the other end portion. The hose connected by the locking claw portion 38 is prevented from coming off. The pipe body 32 of this embodiment is bent from the first pipe portion 34 inserted into the through hole 18a of the grommet 10 (through-shaped pipe portion 18) from the rear and from the first pipe portion 34 on the outside of the grommet 10. Although it is formed from the second pipe portion 36 extending so as to be formed, the shape of the pipe body 32 is arbitrary, and for example, the entire pipe body 32 may be formed linearly. Here, when the first pipe portion 34 is inserted into the through hole 18a of the penetrating pipe portion 18, the locking claw portion 38 provided in the first pipe portion 34 engages with the front end surface 18b of the penetrating pipe portion 18. It is designed to stop, thereby preventing the connecting pipe 30 from being separated from the grommet 10.

Further, the first pipe portion 34 is provided with a pressing plate 40 so as to extend outward in the radial direction of the first pipe portion 34. The pressing plate 40 pushes the pushing portion 20 of the grommet 10 in a state where the locking claw portion 38 of the first pipe portion 34 is inserted into the through hole 18a of the penetrating pipe portion 18 of the grommet 10 and locked. It comes into contact with the surface 20a. Here, the distance from the locking claw portion 38 of the first pipe portion 34 to the pressing plate 40 is formed so as to substantially match the distance from the front end surface 18b of the penetrating pipe portion 18 to the pushing surface 20a of the pushing portion 20. The connecting pipe 30 is brought into contact with the pushing surface 20a of the pushing portion 20 while the locking claw portion 38 of the first pipe portion 34 is locked to the front end surface 18b of the penetrating pipe portion 18. It is stably held in a predetermined position with respect to the grommet 10.

Further, the first pipe portion 34 is provided with a protective plate 42 at a position farther from the end portion of the first pipe portion 34 than the pressing plate 40. The protective plate 42 is formed to have a diameter larger than that of the pressing plate 40, and covers the rear opening of the base portion 12 so as to close the rear opening. That is, the protective plate 42 prevents foreign matter from entering the inside of the base portion 12 and prevents damage to the grommet 10.

Next, the configuration of the grommet 10 will be described in more detail with its action when attached to the panel 50. The connecting pipe 30 may be attached to the grommet 10 at any time before or after attaching the grommet 10 to the panel 50, but here, the grommet 10 is attached to the panel 50 with the connecting pipe 30 attached. It shall be installed. As shown in FIG. 4A, when the grommet 10 is attached to the panel 50, the pressing surface 20a of the pressing portion 20 is pushed forward with the penetrating tube portion 18 facing the through hole 50a to push the substrate 20a forward. The portion 12 is pushed into the through hole 50a of the panel 50. Here, in the state where the connecting pipe 30 is attached to the grommet 10, by grasping the connecting pipe 30 and pushing it forward, the pressing plate 40 of the connecting pipe 30 pushes the pushing surface 20a of the pushing portion 20 forward. be able to.

While the base portion 12 is pushed into the through hole 50a of the panel 50, the base portion 12 elastically deforms inward while sliding on the edge portion of the through hole 50a. Then, as shown in FIG. 4B, the elastic deformation of the base portion 12 is maximized when the annular end portion 12b of the base portion 12 faces the opening edge of the through hole 50a. Then, when the annular end portion 12b of the base portion 12 passes through the through hole 50a, the base portion 12 elastically returns to its original shape, and the panel 50 engages with the panel engaging groove 16 (FIG. 4 (c)). reference)).

Here, the pushing portion 20 exerts a force for pushing the base portion 12 outward when the inclined outer peripheral surface 12a of the base portion 12 is pushed forward in a state of being in contact with the edge portion of the through hole 50a. It is formed to increase the volumetric strain of the substrate portion 12. Here, the volumetric strain is a strain related to volume deformation, and is obtained by dividing the volume change of the base portion 12 by the volume of the original base portion 12. That is, when the volume strain is ε, the volume of the base portion 12 before deformation is V ₁ , and the volume of the base portion 12 after deformation is V ₂ , it is represented by ε = (V _2- V ₁ ) / V _1. NS. This volumetric strain may be obtained by CAE analysis, or may be obtained by actually producing a test product and actually measuring it. In this embodiment, the volumetric strain is obtained by CAE analysis. That is, as shown in FIG. 5, when the pushing surface 20a of the pushing portion 20 is pushed forward with a predetermined pushing force F, the base portion 12 comes into contact with the edge portion of the through hole 50a of the panel. A force F1 acts so as to push the base portion 12 outward, and the inner surface side of the base portion 12 is deformed so as to be compressed and the outer surface side is deformed so as to be stretched (see FIG. 4 (b)). Stress is concentrated on the contact portion of the through hole 50a of the panel with the edge portion, and the volume distortion of the base portion 12 increases.

Here, the grommet 10 is formed so that the volume strain of the base portion 12 becomes 0.3 or more when it is attached to the through hole 50a of the panel 50. By setting the volume distortion of the base portion 12 to 0.3 or more, the grommet 10 when the annular end portion 12b of the base portion 12 passes through the through hole 50a and the base portion 12 elastically returns to its original shape. The insertion resistance of the panel 50 disappears sharply, and a tactile sensation (moderation) that the panel 50 is definitely fitted in the panel engaging groove 16 can be obtained. Further, since the outer peripheral edge of the panel engaging groove 16 is formed so as to have a diameter slightly larger than that of the through hole 50a, the opening of the through hole 50a of the panel 50 when the base portion 12 elastically returns to its original shape. The edge comes into contact with the panel engaging groove 16 vigorously, and not only the tactile sensation in which the insertion resistance suddenly disappears but also the sense of moderation that the panel 50 is definitely fitted in the panel engaging groove 16 is obtained through hearing such as contact sound. Can be done.

Further, the volume strain of the substrate portion 12 is more preferably 0.33 or more, and the volume strain is more preferably 0.36 or more. Volumetric distortion of the substrate portion 12 By setting the volume distortion in such a range, the sense of moderation can be further emphasized. In particular, when the volume distortion is 0.36 or more, a remarkable sense of moderation can be obtained, which is suitable for mounting the grommet 10 in a place where it is impossible or difficult to visually confirm the mounting state. .. Further, when the volumetric strain of the base portion 12 increases, the insertion resistance due to the elastic deformation of the base portion 12 becomes excessive, which leads to impairing workability. Therefore, the volume distortion of the base portion 12 when the grommet 10 is attached to the panel 50 is preferably 0.5 or less, and more preferably 0.48 or less.

Specifically, as shown in FIG. 2C, the push-in portion 20 has a through hole from the protruding end of the annular end portion 12b of the base portion 12 to the push-in surface 20a based on the mounting posture of the grommet 10 with respect to the panel 50. It is formed so that the interval L in the opening direction (pushing direction) of 50a is -1 mm to +5 mm. The state in which the pushing surface 20a of the pushing portion 20 is located on the front side of the protruding end of the annular end portion 12b is indicated by (-), and the state in which the pushing surface 20a of the pushing portion 20 is located on the rear side of the protruding end of the annular end portion 12b is indicated by (+). ing. Since the pushing surface 20a of the pushing portion 20 is located in the above range with respect to the annular end portion 12b of the base portion 12, the annular end portion 12b of the base portion 12 is pushed into the through hole 50a of the panel 50 in the process of pushing the base portion 12 into the through hole 50a of the panel 50. The volumetric strain of the base portion 12 can be set to 0.3 to 0.5 in a state where the base portion 12 is in contact with the inside of the edge portion of the through hole 50a and the elastic deformation of the base portion 12 is maximized (state in the figure).

Further, it is desirable that the grommet 10 is formed of elastic rubber having a hardness in the range of 50 to 80 as measured by a durometer hardness tester (type A) based on JIS K6253. Further, it is desirable that the thickness T of the push-in portion 20 of the grommet 10 is formed so as to have a thickness of T / D × 100 ≧ 10 (%) with respect to the inner diameter D (diameter) of the through hole 50a of the panel 50. .. That is, when the thickness T of the pushing portion 20 is too thin with respect to the inner diameter D of the through hole 50a, the pushing portion 20 tends to buckle when the pushing surface 20a of the pushing portion 20 is pushed, and the pushing portion 20 tends to buckle. The position of the pushing surface 20a with respect to the panel surface 52 may not be maintained within the above-mentioned range.

That is, the volume of the base portion 12 is formed by forming the grommet 10 so that the positional relationship of the push-in portion 20 with respect to the panel surface 52 of the push-in portion 20, the hardness of the elastic rubber, and the thickness of the push-in portion 20 are within the above ranges. The strain can be set to 0.3 to 0.5, and a good sense of moderation can be obtained when the grommet 10 is attached to the panel 50 without excessively increasing the insertion load into the through hole 50a of the panel 50. Can be done. Further, when the grommet 10 is attached to the panel 50, the inner peripheral edge of the through hole 50a is engaged with the panel engaging groove 16 only by the base portion passing through the through hole 50a of the panel 50. That is, it is not necessary to form protrusions or the like in order to enhance the feeling of moderation when the grommet 10 is attached, the entire grommet 10 can be made into a simple shape, and an increase in the insertion load when the grommet 10 is attached to the panel 50 is suppressed. be able to. Further, since the grommet 10 can be made into a simple shape, there is an advantage that the mold shape for molding the grommet 10 can be simplified and the manufacturing cost can be suppressed at low cost.

(Test example)
Here, the grommets 10 to be the test bodies 1 to 5 were prepared, and a mounting test was conducted in which the grommets 10 were attached to the through holes 50a having an inner diameter of 25 mm formed in the panel 50. The results of the mounting test are shown in Table 1. The grommets 10 of the test bodies 1 to 5 are made of EPDM rubber having a hardness of 60 as measured by a durometer hardness tester (type A) based on JIS K6253, and the thickness of the base portion 12 is 1.4 mm. The outer peripheral diameter of the annular end portion 12b of the portion 12 was 17.8 mm, the outer peripheral diameter of the panel engaging groove 16 was 2.6 mm, and the thickness of the push-in portion 20 was 2.5 mm. Further, in the process of pushing the base portion 12 into the through hole 50a of the panel 50, the pushing surface 20a of the pushing portion 20 with respect to the panel surface 52 is in a state where the annular end portion 12b of the base portion 12 faces the opening edge of the through hole 50a. Specimen 1 is located at +4.5 mm, Specimen 2 is located at +0.2 mm, Specimen 3 is located at -0.5 mm, Specimen 4 is located at -2.5 mm, and Specimen 5 is located at -2.5 mm. A push-in portion 20 is formed in each test body so as to be located at −4.5 mm. The insertion speed of the grommet 10 into the through hole 50a of the panel 50 was set to 10 mm / min.

As shown in Table 1, in the grommet 10 according to the test bodies 1 to 3, the volumetric strains of the base portion 12 are 46, 36, and 32, respectively, and the annular end portion 12b of the base portion 12 passes through the through hole 50a and the grommet 10 When the panel 50 was attached to the panel 50, the insertion resistance suddenly disappeared, and it was possible to obtain a good sense of moderation in which the panel 50 could be grasped by touch and hearing that the panel 50 was fitted in the panel engaging groove 16. On the other hand, in the grommets 10 according to the test bodies 4 to 5, the volumetric strains of the base portion 12 are 26 and 24, respectively, the annular end portion 12b of the base portion 12 passes through the through hole 50a, and the grommet 10 is attached to the panel 50. There was little change in the insertion resistance at the time, and a sufficient sense of moderation could not be obtained. That is, from the result of this sensory test, by forming the grommet 10 so that the volume distortion of the substrate portion 12 is in the range of 0.3 to 0.5, it is good when the grommet 10 is attached to the panel 50. It can be seen that a sense of moderation can be obtained.

(Change example)
The configuration is not limited to the above-described embodiment, and can be changed as follows, for example.
(1) Although the push-in portion 20 is formed in a cylindrical shape, it does not have to be in a cylindrical shape, and may be formed in a square tubular shape, for example.
(2) The push-in portion 20 does not have to have a continuous cylindrical wall surface, and a plurality of push-in portions 20 may be formed, and the plurality of push-in portions 20 may form, for example, a cylindrical shape. Further, a gap may be formed between the plurality of divided pressing portions 20. When the wall surface of the pushing portion 20 is formed into a continuous shape, there is an advantage that when the pushing surface 20a of the pushing portion 20 is pushed, a force can be applied evenly to the base portion 12. be.
(3) In the embodiment, the connecting pipe 30 is attached to the grommet 10, but the connecting pipe 30 can be omitted. That is, the pushing surface 20a of the pushing portion 20 of the grommet 10 may be pushed by the operator's fingers, tools, or the like. Further, it is natural that it can be applied to the grommet 10 in which the wire harness is inserted into the through hole 18a. Further, the grommet 10 is not limited to the configuration of being attached to the panel 50 that separates the accommodation chamber HR, and can be attached to various panels provided so as to partition the space.

10 Grommet, 12 Base part, 14 Retaining part, 16 Panel engaging groove 18 Penetrating pipe part, 20 Pushing part

Claims (3)

A grommet made of elastic rubber and attached to the through hole of the panel.
A frustum-shaped substrate whose inner diameter gradually shrinks,
A penetrating tube portion provided on the small diameter side of the substrate portion and having both ends open,
A retaining portion provided on the large diameter side of the substrate portion and engaged with the surface of the panel to prevent it from coming off.
A panel engaging groove provided between the large-diameter end portion of the base portion and the retaining portion and with which the inner peripheral edge of the through hole engages.
A push-in portion provided inside the base portion and pushed into the through hole of the panel is provided.
A grommet characterized in that when the push-in portion is pushed in and attached to the through hole of the panel, the volume strain of the base portion is formed to be 0.3 or more. The push-in portion is characterized in that the distance in the push-in direction from the end portion on the large-diameter side inserted into the through hole of the panel in the base portion to the push-in surface is in the range of -1 mm to +5 mm. The grommet according to claim 1. The grommet according to claim 1 or 2, wherein the substrate portion is formed of an elastic rubber having a hardness in the range of 50 to 80 based on JIS K6253.

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