Grommet

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

[Technical field]

[0001] The present invention relates to a grommet that is attached to a through hole formed in a panel. [Background technology]

[0002] Various vehicles, such as automobiles, ships, and aircraft, are divided into a plurality of spaces by panels made of steel plates or the like, and the equipment arranged in the divided spaces is connected by wire harnesses and various piping that pass through through holes formed in the panels. When passing the wire harness or the like through the through holes of the panels, grommets made of an elastic body such as rubber are attached to the through holes to prevent damage caused by contact with the edge of the through holes and to prevent the intrusion of sound, water, dust, and the like through the through holes. For example, in a vehicle such as an automobile, a grommet is attached to a through hole formed in a body panel, such as a dash panel, that separates the passenger compartment from the engine compartment, and a wire harness inserted through the grommet connects a battery installed in the engine compartment as a power supply source to various electrical devices arranged on the passenger compartment side.

[0003] Here, if the grommet is attached in an abnormal state to the through-hole of the panel, a malfunction may occur, such as the grommet falling off the through-hole due to vibrations generated in the attachment target such as a vehicle. For this reason, a device has been proposed to make it possible to know whether the grommet is attached properly to the panel. For example, the grommet of Patent Document 1 has a moderation-sensing protrusion on a small-diameter annular portion that passes through the through-hole of the panel and forms the edge of a circumferential groove into which the through-hole fits, and when the grommet is attached to the panel, the insertion resistance that increases when the moderation-sensing protrusion passes through the through-hole together with the small-diameter annular portion suddenly disappears when the grommet fits into the through-hole, so that it is possible to know by touch that the grommet is attached properly. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6490448 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the configuration in which a moderation protrusion is provided on a grommet as in Patent Document 1, the moderation protrusion creates a large resistance when passing through a through hole, which increases the insertion load into the through hole and the work load. In addition, since the moderation protrusion is molded separately, the shape of the mold tends to become complicated, which is also a factor in increasing manufacturing costs.

[0006] That is, an object of the present invention is to provide a grommet that has a simple shape and provides a good feeling of click. [Means for solving the problem]

[0007] In order to overcome the above problems and achieve the intended object, the invention according to claim 1 of the present application provides: A grommet made of elastic rubber and attached to a through hole of a panel, A frustum-shaped base portion whose inner diameter gradually decreases; a through-hole tube portion provided on the small diameter side of the base portion and having both ends open; a retaining portion provided on a large diameter side of the base portion and engaging with a surface of the panel to prevent the panel from coming off; a panel engagement groove provided between the large diameter end of the base portion and the retaining portion, the panel engagement groove being engaged with an inner peripheral edge of the through hole; a push-in portion provided on the inside of the base portion and pushed in when the base portion is attached to the through hole of the panel, The gist of the invention is that the base portion is formed so that a volumetric strain of the base portion is 0.3 or more when the push-in portion is pushed into the through-hole of the panel and attached thereto. In this way, by making the volumetric strain of the base part when attached to the through hole of the panel 0.3 or more, a sudden change in resistance can be generated when the base part passes through the through hole, and a solid feeling that the panel is fitted into the panel engagement groove, i.e., a good sense of moderation, can be obtained. Also, since the inner peripheral edge of the through hole engages with the panel engagement groove simply by passing the base part through the through hole of the panel, and the grommet is attached to the panel, the entire grommet can be made into a simple shape, and an increase in the insertion load when attaching to the panel can be suppressed.

[0008] The invention according to claim 2 is as follows: The pressing portion is formed so that the distance in the pressing direction from the end portion on the large diameter side of the base portion that is inserted into the through hole of the panel to the pressing surface is in the range of -1 mm to +5 mm. In this way, by forming the push-in portion so that the distance in the pushing direction from the large diameter end of the base portion to the push-in surface is in the range of -1 mm to +5 mm, the volumetric distortion of the base portion when attached to the through hole in the panel can be made to be 0.3 or more, providing a good sense of moderation.

[0009] The invention according to claim 3 is as follows: The base portion is formed from elastic rubber having a hardness in the range of 50 to 80 based on JIS K6253. In this way, by forming the base portion from elastic rubber with a hardness in the range of 50 to 80, the volumetric distortion of the base portion when attached to the through hole of the panel can be made 0.3 or more, providing a good sense of moderation. Effect of the Invention

[0010] According to the present invention, a good sense of moderation can be obtained with a simple shape. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a vehicle equipped with a grommet according to the present invention; [Diagram 2]1A is a side view of a grommet according to an embodiment of the present invention, FIG. 1B is a vertical cross-sectional view of the grommet, and FIG. 1C is an enlarged cross-sectional view of a main portion of the grommet. [Diagram 3] FIG. 2A is a side view of a connecting pipe according to the embodiment, and FIG. 2B is a vertical cross-sectional view of the connecting pipe attached to a grommet. [Figure 4] FIG. 11 is an explanatory diagram showing the process of attaching a grommet to a panel, in which (a) shows the state in which the outer surface of the base part is in contact with the edge of the through hole in the panel, (b) shows the state in which the grommet is pushed in so that the annular end part of the base part is in contact with the opening edge of the through hole, and (c) shows the state in which the grommet is attached to the panel. [Diagram 5] This is an explanatory diagram showing the relationship between the grommet and the panel with the connecting pipe omitted, and shows the state in which the grommet, with the outer surface of the base part in contact with the edge of the through hole in the panel, is pressed with a pushing force F. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, the grommet of the present invention will be described below with reference to the accompanying drawings. In this embodiment, the grommet will be described as being 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.

[0013] (Example) 1, this grommet 10 is integrally molded from an elastically deformable elastic rubber such as EPDM rubber, and is attached to a through hole 50a in a panel 50 that separates a motor room MR at the front of the vehicle in which an electric motor is installed, provided at the front of the passenger compartment HR of an automobile MT, from the interior of the accommodation room HR of the fuel cell BAT. A connecting pipe 30 that relays a hose (not shown) for discharging gas to the fuel cell is also attached to this grommet 10, and by connecting and relaying the hose on the motor room MR side and the hose on the accommodation room HR side to the connecting pipe 30, gas generated by the fuel cell BAT when it generates heat can be discharged outside the accommodation room HR.

[0014] As shown in Fig. 2, the grommet 10 includes a base portion 12 formed to be able to pass through a through hole 50a of a panel 50 with elastic deformation, a retaining portion 14 formed to have a diameter larger than the through hole 50a of the panel 50 and unable to pass through the through hole 50a, a groove-shaped panel engagement groove 16 provided between the base portion 12 and the retaining portion 14 and capable of engaging with the inner peripheral edge of the through hole 50a of the panel 50, and a through-shaped tube portion 18 provided on the opposite side of the base portion 12 from the panel engagement groove 16 and having a through hole 18a with both ends open. Specifically, the base portion 12 is formed to be inclined in a truncated cone shape with an inner diameter gradually expanding, and the retaining portion 14 is provided so as to be connected to the end portion on the large diameter side via the panel engagement groove 16. The through-shaped tube portion 18 is formed at the end portion on the small diameter side of the base portion 12, and the through hole 18a of the through-shaped tube portion 18 is open on the inside and outside of the base portion 12. In this way, grommet 10 is funnel-shaped by base portion 12 and penetrating tubular portion 18. In the following description, the side of grommet 10 where penetrating tubular portion 18 is formed may be referred to as the front side, and the large-diameter opening side of base portion 12 may be referred to as the rear side.

[0015] Here, the outer peripheral edge of the large-diameter end of the base portion 12 (hereinafter sometimes referred to as the annular end portion 12b) is formed to have a larger diameter than the through-hole 50a of the panel 50, and the outer peripheral edge of the panel engagement groove 16 is formed to have a smaller diameter than the annular end portion 12b and a slightly larger diameter than the through-hole 50a. That is, as shown in Fig. 4, by bringing the small-diameter side (the penetrating pipe portion 18) of the base portion 12 into contact with the edge of the through-hole 50a from one side of the panel 50 (for example, the motor room MR side) and pushing the inclined outer peripheral surface 12a of the base portion 12 in contact with the edge of the through-hole 50a, the base portion 12 passes through the through-hole 50a with the entire grommet 10 including the base portion 12 undergoing elastic deformation. As the base portion 12 passes through the through hole 50a, the inner peripheral edge of the through hole 50a engages with the panel engagement groove 16, and the grommet 10 is attached to the panel 50 such that the panel 50 is sandwiched between the annular end portion 12b of the base portion 12 and the retaining portion 14. In this manner, by attaching the grommet 10 to the through hole 50a of the panel 50, the hose is protected from the edge of the through hole 50a of the panel 50, and water, dust, and the like are prevented from entering through the through hole 50a.

[0016] 2(b), the grommet 10 is provided with a push-in portion 20 that enables the grommet 10 to be pushed into the through-hole 50a of the panel 50 from the inside of the base portion 12. The push-in portion 20 is provided on the inside of 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 tubular portion 18. In other words, the penetrating tubular portion 18 and the push-in portion 20 form a continuous through-hole 18a. Here, the distance between the push-in surface 20a forming the rear end surface of the push-in portion 20 and the base portion 12 is formed to be constant over the entire circumference of the push-in portion 20, so that when the grommet 10 is attached to the panel 50, the push-in surface 20a of the push-in portion 20 is pushed forward with the penetrating pipe portion 18 facing the through hole 50a, a force is applied to the base portion 12 facing the edge of the through hole 50a approximately uniformly, and the entire base portion 12 is elastically deformed. Here, as shown in FIG. 2(c), the base portion 12 is provided with a thick portion 12c at a position connected to the push-in portion 20 (the base end portion of the push-in portion 20). That is, by providing the thick portion 12c at the position connected to the push-in portion 20 in the base portion 12, the inward elastic deformation of the base portion 12 is suppressed, and the elastically deformed base portion 12 is easily restored to its original shape.

[0017] 3, the connection pipe 30 attached to the grommet 10 includes a tube 32 having a through hole 32a formed along the longitudinal direction, and locking claws 38 provided at both ends of the tube 32 and inserted into the ends of the hose. The locking claws 38 are formed in a tapered shape that is inclined away from the outer circumferential surface of the tube 32 from the end of the tube 32 where the locking claws 38 are provided toward the other end, so that the connected hose is prevented from coming off by the locking claws 38. The tube 32 in this embodiment is formed of a first tube portion 34 that is inserted from the rear into the through hole 18a of the grommet 10 (the through tube portion 18) and a second tube portion 36 that extends from the first tube portion 34 so as to be bent outside the grommet 10, but the shape of the tube 32 is arbitrary, and for example, the entire tube 32 may be formed in a straight line. 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 on the first pipe portion 34 is adapted to lock onto the front end face 18b of the penetrating pipe portion 18, thereby preventing the connecting pipe 30 from coming off the grommet 10.

[0018] Further, the first pipe portion 34 is provided with a pressing plate 40 extending radially outward from the first pipe portion 34. The pressing plate 40 is adapted to abut against the pushing surface 20a of the pushing portion 20 of the grommet 10 when the locking claw portion 38 of the first pipe portion 34 is inserted into and locked in the through hole 18a of the penetrating pipe portion 18 of the grommet 10. 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 be substantially the same as the distance from the front end surface 18b of the penetrating pipe portion 18 to the pushing surface 20a of the pushing portion 20, and 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 and the pressing plate 40 abuts against the pushing surface 20a of the pushing portion 20, so that the connecting pipe 30 is stably held in a predetermined position relative to the grommet 10.

[0019] Further, a protective plate 42 is provided on the first pipe portion 34 at a position farther from the end of the first pipe portion 34 than the pressing plate 40. This protective plate 42 is formed with a larger diameter than the pressing plate 40, and covers the rear opening of the base portion 12 from the outside so as to close the rear opening. In other words, the protective plate 42 prevents foreign matter from entering the inside of the base portion 12 and prevents damage to the grommet 10.

[0020] Next, the configuration of the grommet 10 and its action when attached to the panel 50 will be described in more detail. The connecting pipe 30 may be attached to the grommet 10 either before or after the grommet 10 is attached to the panel 50. Here, the grommet 10 is attached to the panel 50 with the connecting pipe 30 attached. As shown in FIG. 4(a), when attaching the grommet 10 to the panel 50, the pushing surface 20a of the pushing portion 20 is pushed forward with the penetrating pipe portion 18 facing the through hole 50a, and the base 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, the pushing surface 20a of the pushing portion 20 can be pushed forward by the pressing plate 40 of the connecting pipe 30 by gripping and pushing the connecting pipe 30 forward.

[0021] While the base part 12 is being pressed into the through hole 50a of the panel 50, the base part 12 elastically deforms inward while sliding against the edge of the through hole 50a. Then, as shown in Fig. 4(b), the elastic deformation of the base part 12 is maximum when the annular end part 12b of the base part 12 faces the opening edge of the through hole 50a. Then, as the annular end part 12b of the base part 12 passes through the through hole 50a, the base part 12 elastically returns to its original shape, and the panel 50 engages with the panel engagement groove 16 (see Fig. 4(c)).

[0022] Here, the pushing part 20 is formed so as to exert a force pushing the base part 12 outward when the inclined outer peripheral surface 12a of the base part 12 is pushed forward while in contact with the edge of the through hole 50a, thereby increasing the volumetric strain of the base part 12. Here, the volumetric strain is a strain related to volumetric deformation, and is obtained by dividing the volume change of the base part 12 by the original volume of the base part 12. That is, when the volumetric strain is ε, the volume of the base part 12 before deformation is V1, and the volume of the base part 12 after deformation is V2, it is expressed as ε=(V2-V1) / V1. This volumetric strain may be obtained by CAE analysis, or may be obtained by actually manufacturing a test piece and measuring it. In this embodiment, the volumetric strain is obtained by CAE analysis. That is, as shown in Figure 5, when the pressing surface 20a of the pressing portion 20 is pressed forward with a predetermined pressing force F, the base portion 12 comes into contact with the edge of the through hole 50a in the panel, and a force F1 acts to push the base portion 12 outward, causing the inner surface side of the base portion 12 to deform in a compressed manner and the outer surface side to deform in an expanded manner (see Figure 4(b)). As a result, stress is concentrated at the contact point between the base portion 12 and the edge of the through hole 50a in the panel, and the volumetric distortion of the base portion 12 increases.

[0023] Here, the grommet 10 is formed so that the volumetric strain of the base portion 12 is 0.3 or more when the grommet 10 is attached to the through hole 50a of the panel 50. By making the volumetric strain of the base portion 12 0.3 or more, 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 grommet 10 suddenly disappears, and a tactile sense (a sense of moderation) that the panel 50 is definitely fitted into the panel engagement groove 16 can be obtained. In addition, since the outer peripheral edge of the panel engagement groove 16 is formed to have a slightly larger diameter than the through hole 50a, when the base portion 12 elastically returns to its original shape, the opening edge of the through hole 50a of the panel 50 comes into contact with the panel engagement groove 16 with force, and the sense of moderation that the panel 50 is definitely fitted into the panel engagement groove 16 can be obtained not only through the tactile sense of the sudden disappearance of the insertion resistance but also through the auditory sense of the contact sound, etc.

[0024] Moreover, it is more preferable that the volumetric strain of the base portion 12 is 0.33 or more, and more preferably, the volumetric strain is 0.36 or more. By setting the volumetric strain of the base portion 12 in such a range, the sense of moderation can be made more prominent. In particular, when the volumetric strain is 0.36 or more, a prominent sense of moderation can be obtained, which is suitable for mounting the grommet 10 in a place where visual confirmation of the mounting state is impossible or difficult. Furthermore, if the volumetric strain of the base portion 12 increases, the insertion resistance associated with the elastic deformation of the base portion 12 becomes excessive, which leads to a loss of workability. For this reason, the volumetric strain of the base portion 12 when mounting the grommet 10 to the panel 50 is preferably 0.5 or less, and more preferably 0.48 or less.

[0025] Specifically, as shown in FIG. 2(c), the pushing portion 20 has a through hole 50a extending from the protruding end of the annular end 12b of the base portion 12 to the pushing surface 20a, based on the mounting posture of the grommet 10 relative to the panel 50. of The space L in the opening direction (pushing direction) is -1mm to +5mm. The state in which the pushing surface 20a of the pushing portion 20 is located in front of the protruding end of the annular end 12b is indicated by (-), and the state in which the pushing surface 20a of the pushing portion 20 is located behind the protruding end of the annular end 12b is indicated by (+). By positioning the pushing surface 20a of the pushing portion 20 in the above range with respect to the annular end 12b of the base portion 12, the annular end 12b of the base portion 12 comes into contact with the inside of the edge of the through hole 50a in the process of pushing the base portion 12 into the through hole 50a of the panel 50, and the volumetric strain of the base portion 12 can be set to 0.3 to 0.5 when the elastic deformation of the base portion 12 is maximized (the state in the figure).

[0026] Furthermore, grommet 10 is desirably formed from 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. Also, it is desirably formed such that thickness T of push-in portion 20 of grommet 10 satisfies T / D×100≧10(%) with respect to inner diameter D (diameter) of through hole 50a of panel 50. In other words, if thickness T of push-in portion 20 is too thin compared to inner diameter D of through hole 50a, push-in portion 20 is likely to buckle when push-in surface 20a of push-in portion 20 is pushed in, and there is a possibility that the position of push-in surface 20a of push-in portion 20 relative to panel surface 52 cannot be maintained within the above-mentioned range.

[0027] That is, by forming the grommet 10 so that the positional relationship of the pushing surface 20a of the pushing portion 20 with respect to the panel surface 52, the hardness of the elastic rubber, and the thickness of the pushing portion 20 are within the above ranges, the volumetric distortion of the base portion 12 can be set to 0.3 to 0.5, and a good sense of moderation can be obtained when mounting the grommet 10 to the panel 50 without excessively increasing the insertion load of the grommet 10 into the through hole 50a of the panel 50. In addition, when mounting the grommet 10 to the panel 50, the inner periphery of the through hole 50a engages with the panel engagement groove 16 simply by passing the base portion through the through hole 50a of the panel 50. In other words, there is no need to form a protrusion or the like to increase the sense of moderation when mounting the grommet 10, and the entire grommet 10 can be made into a simple shape, and an increase in the insertion load when mounting the grommet 10 to the panel 50 can be suppressed. In addition, since the grommet 10 can be made into a simple shape, there is an advantage that the shape of the mold for molding the grommet 10 can be simplified, and the manufacturing cost can be kept low.

[0028] (Test Example) Here, grommets 10 were prepared as specimens 1 to 5, and an attachment test was conducted in which grommets 10 were attached to through holes 50a having an inner diameter of 25 mm formed in panel 50. The results of the attachment test are shown in Table 1. Grommets 10 of specimens 1 to 5 were formed using EPDM rubber having a hardness of 60 as measured with a durometer hardness tester (type A) based on JIS K6253, so that the thickness of base portion 12 was 1.4 mm, the outer circumferential diameter of annular end portion 12b of base portion 12 was 17.8 mm, the outer circumferential diameter of panel engagement groove 16 was 2.6 mm, and the thickness of 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, with the annular end portion 12b of the base portion 12 facing the opening edge of the through hole 50a, the push-in surface 20a of the push-in portion 20 against the panel surface 52 is formed on each test body so as to be located at +4.5 mm in test body 1, at +0.2 mm in test body 2, at -0.5 mm in test body 3, at -2.5 mm in test body 4, and at -4.5 mm in test body 5. The insertion speed of the grommet 10 into the through hole 50a of the panel 50 was set to 10 mm / min.

[0029] [Table 1]

[0030] As shown in Table 1, the volumetric strains of the base portion 12 of the grommets 10 of the test specimens 1 to 3 were 46, 36, and 32, respectively, and when the annular end portion 12b of the base portion 12 passed through the through hole 50a and the grommet 10 was attached to the panel 50, the insertion resistance suddenly disappeared, and a good sense of moderation was obtained in which the panel 50 was fitted into the panel engagement groove 16 could be grasped by touch and hearing. On the other hand, the volumetric strains of the base portion 12 of the grommets 10 of the test specimens 4 to 5 were 26 and 24, respectively, and when the annular end portion 12b of the base portion 12 passed through the through hole 50a and the grommet 10 was attached to the panel 50, the change in insertion resistance was small, and a sufficient sense of moderation could not be obtained. In other words, from the results of this sensory test, it can be seen that a good sense of moderation can be obtained when the grommet 10 is attached to the panel 50 by forming the grommet 10 so that the volumetric strain of the base portion 12 is in the range of 0.3 to 0.5.

[0031] (Example of change) The configuration of the embodiment is not limited to the above, and can be modified as follows, for example. (1) Although the pushing portion 20 is formed in a cylindrical shape, it does not have to be cylindrical and may be formed in, for example, a square tube shape. (2) The pushing portion 20 does not need to have a continuous cylindrical wall surface, and a plurality of pushing portions 20 may be formed, for example, so that the plurality of pushing portions 20 form a cylindrical shape. Also, gaps may be formed between the divided plurality of pushing portions 20. When the wall surface of the pushing portion 20 is formed in a continuous shape, there is an advantage that a force can be applied uniformly to the base portion 12 when the pushing surface 20a of the pushing portion 20 is pushed in. (3) In the embodiment, the connecting pipe 30 is attached to the grommet 10, but the connecting pipe 30 may be omitted. That is, the pushing surface 20a of the pushing portion 20 of the grommet 10 may be pushed in by the operator's finger, a tool, or the like. Naturally, the present invention can be applied to the grommet 10 in which the wire harness is inserted into the through hole 18a. Furthermore, the grommet 10 is not limited to a configuration in which it is attached to the panel 50 that separates the accommodation chamber HR, but can be attached to various panels that are provided to separate a space. [Explanation of symbols]

[0032] 10 grommet, 12 base portion, 14 retaining portion, 16 panel engagement groove 18 through-hole tube portion, 20 push-in portion

Claims

[Claim 1] A grommet made of elastic rubber and attached to a through hole of a panel, A frustum-shaped base portion whose inner diameter gradually decreases; a through-hole tube portion provided on the small diameter side of the base portion and having both ends open; a retaining portion provided on a large diameter side of the base portion and engaging with a surface of the panel to prevent the panel from coming off; a panel engagement groove provided between the large diameter end of the base portion and the retaining portion, the panel engagement groove being engaged with an inner peripheral edge of the through hole; a push-in portion provided on the inside of the base portion and pushed in when the base portion is attached to the through hole of the panel, the push-in portion is formed such that a distance in a push-in direction from an end portion on a large diameter side of the base portion that is inserted into a through hole of a panel to a push-in surface is within a range of −1 mm to +5 mm, The base portion is formed of an elastic rubber having a hardness in the range of 50 to 80 based on JIS K6253, The thickness (T) of the pressed-in portion is set to be T / D×100≧10(%) with respect to the inner diameter (D) of the through hole of the panel. A grommet characterized by:

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