JP2010088217A - Grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further enhance sound insulation of a grommet which is equipped with a sound insulation portion. <P>SOLUTION: In a grommet 10 continuously provided with a small diameter tubular portion 11 into which a wire harness 70 is inserted tightly, an enlarged tubular portion 12, and a large diameter tubular portion 13 and fixed to the through hole 61 of a body panel 60, a first flap 18 and a second flap 19 are projected from the outer circumferential surface of the small diameter tubular portion 11 at an interval in the axial direction, wherein the peripheral edge 18a at the tip of the first flap 18 abuts on the surface of a sound insulation material 62 laminated on one side of the body panel 60, the peripheral edge 19a at the tip of the second flap 19 abuts on the first flap 18 or abuts directly on the sound insulation material 62 in a state fixed to the body panel 60, thus providing a first sound absorption air layer S1 surrounded by the first flap 18, the enlarged tubular portion 12, the large diameter tubular portion 13 and the peripheral edge of opening of the sound insulation material 62, and a second sound absorption air layer S2 surrounded by the first flap 18, the second flap 19 and the small diameter tubular portion 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a grommet that is attached in a state where a wire harness is inserted into a through hole provided in a vehicle body of an automobile, and in particular, in a case having a seal structure with a sound insulation portion, further improving sound insulation.

  When wiring the wiring harness through the through hole provided in the vehicle body panel that separates the engine room from the vehicle compartment, rubber or elastomer grommet is interposed to waterproof, dustproof, soundproof, etc. I am trying. Especially, the grommet which has a sound-insulation part is widely used as what prevents and suppresses the noise of an engine room being transmitted to a vehicle interior.

  FIG. 12 shows a grommet shown in registered utility model No. 3049904 as this type of grommet. The grommet 1 has small-diameter cylindrical portions 2 and 3 that are inserted through the wire harness W in close contact with each other in the axial direction via the large-diameter cylindrical portion 4. A vehicle body locking recess 5 that fits into the through hole 7a is formed, and a sound insulation flap 6 is projected from the outer peripheral surface. The grommet 1 seals the through hole 8a of the sound insulating material 8 by bringing the front end of the peripheral edge of the sound insulating flap 6 into contact with the surface of the sound insulating material 8 laminated on the vehicle body panel 7, and also with the flap 6 and the large diameter. Sound insulation is enhanced by forming a sealed air layer 9 in a space surrounded by the cylindrical portion 4 and the inner peripheral surface of the through hole 8a of the sound insulation material 8.

  However, in recent years, since there is a tendency to require a high degree of silence in the passenger compartment, it is necessary to further improve the sound insulation performance of the grommet.

Registered Utility Model No. 3049904

  This invention is made | formed in view of the said problem, and makes it a subject to further improve a sound insulation performance in a grommet provided with a sound insulation part.

In order to solve the above-described problems, the present invention provides a small-diameter cylindrical portion that is inserted in close contact with a wire harness arranged in a vehicle, an enlarged-diameter cylindrical portion that is continuous with one end of the small-diameter cylindrical portion, and the enlarged-diameter cylindrical portion. A grommet made of an elastic material including a large-diameter cylindrical portion that is continuous with the large-diameter tip and an annular vehicle body locking recess that fits into a through-hole of a vehicle body panel provided on the outer peripheral surface of the large-diameter cylindrical portion. There,
The outer peripheral surface of the small-diameter cylindrical portion includes a first flap and a second flap that protrude in a conical shape with an interval in the axial direction toward the enlarged-diameter cylindrical portion side,
The first flap is sized to abut on the surface of the sound insulating material laminated on one side of the vehicle body panel so as to surround the through hole, and the second flap has a periphery abutting on the sound insulating material. The first flap, the enlarged-diameter cylindrical portion, and the large-diameter cylinder are attached to the vehicle body panel in such a size that the first flap is in contact with each other or the peripheral edge of the second flap is in direct contact with the sound insulating material. And a first sound-absorbing air layer surrounded by the opening periphery of the sound insulating material, and a second sound-absorbing air layer surrounded by the first flap, the second flap, and the small-diameter cylindrical portion. The grommet characterized by this is provided.

  Thus, by projecting two flaps at an interval in the axial direction from the outer peripheral surface of the small diameter cylindrical portion of the grommet, when the grommet is attached to the through hole of the vehicle body panel, The two sealed sound-absorbing air layers can be formed between the one side and the other side of the vehicle body panel, and the through holes can be sealed through the two sound-absorbing air layers and two flaps. Therefore, the sound insulation performance can be further improved as compared with the conventional grommet that seals the through hole with one flap and one air layer.

Further, the present invention provides a small-diameter cylindrical portion that is inserted in close contact with a wire harness that is routed in a vehicle, an enlarged-diameter cylindrical portion that is continuous with one end of the small-diameter cylindrical portion, and a large-diameter-side tip of the enlarged-diameter cylindrical portion; A grommet made of an elastic material having a continuous large-diameter cylindrical portion and an annular vehicle body locking recess that fits into a through-hole of a vehicle body panel provided on the outer peripheral surface of the large-diameter cylindrical portion,
A retrofit member attached to the small-diameter cylindrical portion is provided, and the retrofit member is connected to or externally attached to the main body-side small-diameter cylindrical portion, and an axial direction from the outer peripheral surface of the retrofit-side small-diameter cylindrical portion. A first flap and a second flap projecting in a conical shape with a gap therebetween,
The first flap is sized to abut on the surface of the sound insulating material laminated on one side of the vehicle body panel so as to surround the through hole, and the second flap has a periphery abutting on the sound insulating material. The first flap, the enlarged-diameter cylindrical portion, and the large-diameter cylindrical portion in a state where the first flap is in contact with the first flap or the peripheral edge of the second flap is in direct contact with the sound insulating material and attached to the vehicle body panel. And a first sound-absorbing air layer surrounded by the opening periphery of the sound-insulating material, and a second sound-absorbing air layer surrounded by the first flap, the second flap, and the rear-side small-diameter cylindrical portion. It provides a grommet characterized by that.

  As described above, the first flap and the second flap are provided on the retrofitting member, and the retrofitting member is attached to the main body side small-diameter cylindrical portion of the grommet so that the flap is integrated with the grommet. It can be manufactured easily without requiring any technology.

  The retrofitting member forms a step-shaped recess having a square cross section by connecting the rear end surface of the retrofitting side small diameter cylindrical portion and the inner peripheral surface of the first flap, and the retrofitting member is used as a grommet. When attached, the rear end surface of the rear-side small-diameter cylindrical portion serving as the bottom surface of the stepped recess is projected from the opening-side end surface of the main-body-side small-diameter cylindrical portion or the outer peripheral surface of the main-body-side small-diameter cylindrical portion. It is preferable that the configuration is such that it can be positioned against the abutment rib.

  In this way, by providing a structure that can be positioned by abutting each other on the main body side and the rear attachment member side of the grommet, the rear attachment member can be easily and accurately positioned relative to the grommet main body when the rear attachment member is attached. it can. Therefore, the retrofitting member is too deeply fitted into the main body side to crush the first sound-absorbing air layer, or is too shallow and the first flap floats without coming into contact with the surface of the sound insulating material. It is possible to prevent a poor formation of the air layer and to function a stable sound insulation that is always stable.

A grommet may be formed on the main body side small-diameter cylindrical portion to prevent the retrofitting member from slipping forward.
Specifically, the small-diameter cylindrical portion of the retrofitting member is externally fitted to the main body-side small-diameter cylindrical portion, and the retrofitting member is attached to the grommet main body, and outside the opening end (front end) of the main-body-side small-diameter cylindrical portion. The abutting rib is projected, and the abutting rib projecting outward from the front end of the small diameter cylindrical portion at the rear side or the abutting rib is abutted against the rear end surface of the abutting rib. Thereby, it can prevent that a retrofitting member shifts ahead rather than the normal attachment position to a grommet main body.

  As described above, the grommet of the present invention has a double flap structure, so that two sealed sound absorbing air layers can be formed in the through-hole portion of the vehicle body panel, and these two sound absorbing air layers are formed. And the through hole can be sealed through two flaps. Therefore, compared with the conventional grommet which seals a through-hole with one sound absorption air layer with one flap, sound insulation performance can further be improved.

  In addition, the two flaps are provided in a retrofitting member, and the retrofitting member is attached to the main body side small-diameter cylindrical portion of the grommet so that it can be easily manufactured by a technique that is easier than the technique of integrally forming the flap on the grommet. can do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In any of the embodiments, as shown in FIG. 2, the through-hole 61 is attached to a wire harness 70 that passes through a through-hole 61 provided in a vehicle body panel 60 (dash panel) that partitions an engine room X and a vehicle compartment Y of an automobile. The present invention is applied to the grommet attached to the hole 61. A sound insulating material 62 is laminated on the side of the vehicle body Y of the vehicle body panel 60, and an inner through hole 63 communicating with the through hole 61 of the vehicle body panel 60 is provided in the sound insulating material 62.

1 and 2 show a grommet 10 according to a first embodiment of the present invention.
The grommet 10 is an integrally molded product made of rubber or elastomer. As shown in FIG. 1, a small-diameter cylindrical portion 11, a large-diameter cylindrical portion 12 that is continuous with one end of the small-diameter cylindrical portion 11, and a large-diameter cylindrical portion 13 that is continuous with the large-diameter side tip of the large-diameter cylindrical portion 12 A closed wall 14 projecting from the inner peripheral surface of the tip of the large-diameter cylindrical portion 13, and the outer peripheral surface of the large-diameter cylindrical portion 13 is fitted with the peripheral portion of the through hole 61 of the vehicle body panel 60. An annular vehicle body locking recess 17 is provided.

  A harness through hole 15 for inserting the wire harness 70 is provided in the center of the closed wall portion 14, and a small-diameter cylindrical portion 11, an enlarged-diameter cylindrical portion 12, a large-diameter cylindrical portion 13, and a harness penetration that are provided continuously. A hollow portion along the same axis of the hole 15 is used as a wire harness insertion passage 16. The small-diameter cylindrical portion 11 and the harness through hole 15 are configured to be tightly fitted to the outer peripheral surfaces of both ends of the wire harness 70 inserted through the wire harness insertion passage 16.

From the outer peripheral surface of the small-diameter cylindrical part 11, a first flap 18 and a second flap 19 for sound insulation projecting in a conical shape toward the enlarged-diameter cylindrical part 12 are provided so as to be spaced apart in the axial direction. Yes.
As shown in FIG. 2, the first flap 18 has the tip periphery 18 a of the sound insulating material 62 laminated on the vehicle body panel 60 in a state where the grommet 10 is attached to the through hole 61 of the vehicle body panel 60. The size is set so as to contact the surface of the sound insulating material 62 so as to surround the inner through hole 63.
The second flap 19 has a size such that the front end peripheral edge portion 19 a comes into contact with the outer peripheral surface on the front end side of the first flap 18 in contact with the sound insulating material 62.

  As shown in FIG. 2, the grommet 10 having the above-described configuration is configured such that the inner peripheral surface 63 a of the inner through hole 63 of the sound insulating material 62 and the grommet in a state where the wire harness 70 is inserted and attached to the through hole 61 of the vehicle body panel 60. 10 and the outer peripheral surface can be sealed with the first flap 18, and the first flap 18, the small-diameter cylindrical portion 11, the large-diameter cylindrical portion 12, the large-diameter cylindrical portion 13, and the sound insulating material 62 are penetrated through the inside. A sealed first sound-absorbing air layer S1 is formed at a portion surrounded by the inner peripheral surface 63a of the hole 63, and is surrounded by the first flap 18, the second flap 19, and the small-diameter cylindrical portion 11. A second sound-absorbing air layer S2 that is also hermetically sealed can be formed. Thus, since the grommet 10 can increase the number of sealed sound absorbing air layers to two by the double flap structure of the first flap 18 and the second flap 19, the sound insulation is improved as compared with the conventional grommet. In addition, the quietness of the passenger compartment Y side can be improved.

  In the grommet 10, the second flap 19 has a larger diameter than the first flap 18 as in Modification 1 shown in FIG. 3, and the tip peripheral edge portion 19 a of the second flap 19 is in contact with the sound insulating material 62. You may make it contact | abut on the surface of the sound insulation material 62 so that the outer side of the 1st flap 18 may be enclosed.

  Also in the first modification, in addition to the first sound absorbing air layer S1, the second sound absorbing member sealed in a portion surrounded by the first flap 18, the second flap 19, the sound insulating material 62, and the small diameter cylindrical portion 11 is used. Since the air layer S2 can be formed, excellent sound insulation can be provided.

4 to 6 show a grommet 20 according to a second embodiment of the present invention.
The grommet 20 is formed by connecting a grommet main body 21 and a retrofitting member 22 that are separate from each other.

  The grommet body 21 is an integrally molded product made of rubber or elastomer, and is continuous with a small-diameter cylindrical portion (main body-side small-diameter cylindrical portion) 23 that is short in the axial direction and one end of the small-diameter cylindrical portion 23 as shown in FIG. The enlarged diameter cylindrical portion 24, a large diameter cylindrical portion 25 that is continuous with the large diameter side tip of the enlarged diameter cylindrical portion 24, and a closed wall portion 26 that protrudes from the inner peripheral surface of the distal end of the large diameter cylindrical portion 25. ing. On the outer peripheral surface of the large-diameter cylindrical portion 25, an annular vehicle body locking recess 28 that fits with the peripheral edge portion of the through hole 61 of the vehicle body panel 60 is provided.

A harness through hole 27 for inserting the wire harness 70 is provided at the center of the closed wall portion 26, and the harness through hole 27 and the small diameter cylindrical portion 23 are respectively formed on the outer peripheral surfaces of both ends of the wire harness 70. The structure is closely fitted.
The opening side front end surface 23 b of the main body side small diameter cylindrical portion 23 is an abutting surface when the grommet main body 21 and the retrofitting member 22 are connected, and is a vertical surface orthogonal to the axial direction of the main body side small diameter cylindrical portion 23. .

  The retrofitting member 22 is an integrally molded product made of rubber or elastomer, and as shown in FIG. 4, a small-diameter cylindrical part (retrofitting side small-diameter cylindrical part) 31 and an axial direction one end side of the small-diameter cylindrical part 31 are provided. A first flap 32 for sound insulation projecting in a conical shape from the outer peripheral surface, and the first flap 32 from the outer peripheral surface of the central portion in the axial direction of the small-diameter cylindrical portion 31 spaced from the first flap 32 in the axial direction. And a second flap 33 for sound insulation projecting in a conical shape substantially in parallel.

As shown in FIG. 6, the first flap 32 has an inner periphery of the sound insulating material 62 laminated on the vehicle body panel 60 in a state in which the peripheral edge portion 32 a is attached to the through hole 61 of the vehicle body panel 60. The size is set so as to contact the surface of the sound insulating material 62 so as to surround the through hole 63.
The second flap 33 is sized such that the tip peripheral edge portion 33 a comes into contact with the outer peripheral surface of the front end side of the first flap 32 in contact with the sound insulating material 62.

  The front end surface 31a (rear end surface 31a) on the flap projecting side of the rear-attached small-diameter cylindrical portion 31 serves as an abutting surface when the grommet body 21 and the rear-attachment member 22 are connected. The abutting surface 31a is a vertical surface orthogonal to the axial direction, and the perpendicular abutting surface 31a and the inclined inner peripheral surface 32b of the first flap 32 are continuous as shown in FIG. A stepped recess 34 having a square cross section with the abutting surface 31a as the bottom is formed.

  When attaching the grommet 20 to the wire harness 70, first, as shown in FIG. 5A, the grommet main body 21 is inserted into the wire harness 70, and the main body side small diameter cylindrical portion 23 and the wire harness 70 are wound with tape. After the grommet main body 21 is positioned and fixed to the wire harness 70 (not shown), the retrofitting member 22 is inserted into the wire harness 70, and as shown in FIG. The rear end surface 31a of the rear attachment side small-diameter cylindrical portion 31 is abutted against the opening-side front end surface 23b, and the grommet body is arranged so that the hollow portion of the main body side small diameter cylindrical portion 23 and the rear attachment side small diameter cylindrical portion 31 are continuous. In a state where the post-attachment member 22 and the post-attachment member 22 are connected, the post-attachment side small-diameter cylindrical portion 31 and the wire harness 70 are wound with tape (not shown) to position and fix the post-attachment member 22 to the wire harness 70. .

  The grommet 20 formed by connecting the rear member 22 to the grommet body 21 in this way is attached to the through hole 61 of the vehicle body panel 60 as shown in FIG. The tip peripheral edge portion 32 a contacts the surface of the sound insulating material 62. Thereby, the clearance gap between the internal peripheral surface 63a of the inner side through-hole 63 of this sound-insulation material 62 and the outer peripheral surface of the grommet main body 21 can be sealed. And the 1st flap 32, the main body side small diameter cylinder part 23, the diameter expansion cylinder part 24, the large diameter cylinder part 25, and the part enclosed by the inner peripheral surface 63a of the inner through-hole 63 of the sound insulating material 62 are sealed. A sound absorbing air layer S1 is formed. In addition, the second sound-absorbing air layer S <b> 2 that is also hermetically sealed can be formed in a portion surrounded by the first flap 32, the second flap 33, and the rear-side small-diameter cylindrical portion 31. Therefore, as in the first embodiment, since the sound-absorbing air layer can be increased as compared with the conventional grommet, the sound insulation can be improved.

  Further, since the grommet 20 has the retrofitting member 22 provided with the flaps 32 and 33 as a separate body from the grommet main body 21, the grommet 20 does not require advanced techniques as in the case of integrally forming the flap on the grommet main body, It can be manufactured relatively easily.

  Furthermore, since the rear end surface 31a of the rear-side small-diameter cylindrical portion 31 and the inner peripheral surface 32b of the first flap 32 form a step-shaped concave portion 34 having a square cross section, the rear member 22 is attached to the grommet main body 21. When attached, as shown in FIG. 5 (B), the opening-side tip 23a of the main body-side small-diameter cylindrical portion 23 is accommodated in the stepped recess 34, and the opening-side tip surface 23b of the main-body-side small-diameter cylindrical portion 23 The rear end surface 31a of the rear attachment side small diameter cylindrical portion 31 can be easily and accurately abutted. Further, the opening end portion 23 a of the main body side small diameter cylindrical portion 23 is fitted into the stepped recess 34. Thereby, it can also prevent that the mutual butting surfaces 23b and 31a of the main body side small diameter cylinder part 23 and the retrofit side small diameter cylinder part 31 mutually shift. Therefore, since the grommet main body 21 and the retrofit member 22 can be connected easily and accurately without a gap, workability and quality stability can be improved.

FIG. 7 shows a first modification of the second embodiment.
In the first modification, the flange portion 35 protrudes outward from the rear end portion of the rear-side small-diameter cylindrical portion 31, and the first flap 32 protrudes from the outer peripheral end of the flange portion 35. Further, an annular butted rib 29 protrudes outwardly from the opening side front end (front end) of the main body side small diameter cylindrical portion 23.

  In this way, by forming the flange portion 35 in the rear-side small-diameter cylindrical part 31, the area of the rear end surface 31a of the rear-side small-diameter cylindrical part 31 can be increased, and the main-body side small-diameter cylinder against which the rear end surface 31a abuts. The opening-side front end surface 23b of the portion 23 is also enlarged by the formation of the abutting rib 29, and the abutting area can be enlarged. Therefore, the abutting state can be stabilized and strengthened.

  The outer peripheral surface 29a of the abutting rib 29 may protrude in a tapered shape so as to abut on the inner peripheral surface 32b of the first flap 32 of the retrofitting member 22, as in Modification 2 shown in FIG. . Thereby, since the fitting feeling when the opening side front end portion 23a of the grommet main body 21 is fitted into the stepped recess 34 of the retrofit member 22 is increased, the abutting state can be further stabilized and strengthened. it can.

9 to 11 show a grommet 40 according to a third embodiment of the present invention.
The grommet 40 is formed by fitting a grommet main body 41 and a retrofitting member 42 which are separate from each other.

  The grommet main body 41 is an integrally molded product made of rubber or elastomer, and as shown in FIG. 9, a small diameter cylindrical portion (main body side small diameter cylindrical portion) 43 and an enlarged diameter cylindrical portion continuous with one end of the small diameter cylindrical portion 43. 44, a large-diameter cylindrical portion 45 continuous with the large-diameter side tip of the enlarged-diameter cylindrical portion 44, and a closing wall portion 46 protruding from the inner peripheral surface of the distal end of the large-diameter cylindrical portion 45. On the outer peripheral surface of the large-diameter cylindrical portion 45, an annular vehicle body locking recess 48 that fits with the peripheral edge portion of the through hole 61 of the vehicle body panel 60 is provided.

  A harness through hole 47 for inserting the wire harness 70 is provided in the center of the closed wall portion 46, and the harness through hole 47 and the small diameter cylindrical portion 43 are respectively formed on the outer peripheral surfaces of both ends of the wire harness 70. The structure is closely fitted.

  The retrofitting member 42 is an integrally molded product made of rubber or elastomer, and as shown in FIG. 9, a small-diameter cylindrical part (retrofitting-side small-diameter cylindrical part) 51 that fits outside the main-body-side small-diameter cylindrical part 43, The first flap 52 for sound insulation that protrudes in a conical shape from the outer peripheral surface on one end side in the axial direction of the small diameter cylindrical portion 51, and the center in the axial direction of the small diameter cylindrical portion 51 that is spaced from the first flap 52 in the axial direction. And a second flap 53 for sound insulation projecting in a conical shape substantially parallel to the first flap 52 from the outer peripheral surface of the part.

As shown in FIG. 11, the first flap 52 has an inner periphery of the sound insulating material 62 laminated on the vehicle body panel 60 in a state where the tip peripheral edge 52 a is attached to the through hole 61 of the vehicle body panel 60. The size is set so as to contact the surface of the sound insulating material 62 so as to surround the through hole 63.
The second flap 53 has a size such that the front end peripheral portion 53 a abuts on the outer peripheral surface on the front end side of the first flap 52 that abuts on the sound insulating material 62.

The front end surface 51a (rear end surface 51a) on the flap projecting side of the rear attachment side small diameter cylindrical portion 51 serves as an abutment surface when the attachment member 42 is attached to the grommet body 41. The abutting surface 51a is a vertical surface orthogonal to the axial direction. As shown in FIG. 9, the abutting surface 51a and the inclined inner peripheral surface 52b of the first flap 52 are continuous. A stepped recess 54 having a square cross section with the abutting surface 51a as the bottom is formed.
An annular abutment rib 55 is projected from the front end of the rear-attached small-diameter cylindrical portion 51.

  On the outer peripheral surface of the main body side small-diameter cylindrical portion 43, a rear end rib 49 to be abutted against which the abutting surface 51a of the rear member 42 abuts when the rear member 42 is normally attached to the grommet main body 41 is annular. It protrudes to. Further, an annular butted front end rib 50 that abuts the front end surface 55a of the abutting rib 55 of the retrofitting member 42 projects outwardly from the opening side front end (front end) of the main body side small diameter cylindrical portion 43. Yes.

When attaching the grommet 40 to the wire harness 70, first, as shown in FIG. 10A, the grommet body 41 is inserted into the wire harness 70, and the grommet body 41 is attached to a required position of the wire harness 70.
Next, the retrofit member 42 is inserted into the wire harness 70 and the retrofit side small diameter cylindrical portion 51 is externally fitted to the main body side small diameter cylindrical portion 43. As shown in FIG. The rear end face 51 a of the rear-attached small-diameter cylindrical portion 51 is abutted against the abutting rear end rib 49. In addition, the front end surface 55a of the abutment rib 55 of the rear-side small-diameter cylinder part 51 is abutted against the abutting front-end rib 50 of the main-body side small-diameter cylinder part 43, and the rear member 42 is fitted to the grommet body 41 To do.
Next, in this fitted state, the rear attachment side small-diameter cylindrical portion 51 and the wire harness 70 are wound with a tape (not shown), and the attachment member 42 and the grommet body 41 are positioned and fixed integrally with the wire harness 70.

  In this way, the grommet 40 formed by attaching the retrofitting member 42 to the grommet main body 41 has a rear end surface 51 a of the rear-side small-diameter cylindrical part 51 on the abutting rear-end rib 49 protruding from the main-body-side small-diameter cylindrical part 43. By abutting, it is possible to restrict the retrofitting member 42 from being fitted too deeply into the grommet body 41. Further, when the abutting rib 55 of the rear-side small-diameter cylinder part 51 abuts against the abutting front end rib 50 projecting from the main body-side small-diameter cylinder part 43, the fitting of the rear member 42 to the grommet body 41 is shallow. It can control that it becomes too much and the retrofitting member 42 slips forward. Therefore, since these abutting structures enable easy and accurate attachment of the retrofit member 42 to the grommet body 41, workability and quality stability can be improved.

  In addition, the grommet 40 has the first sound-absorbing air layer S1 and the second sound-absorbing air layer S2 and has excellent sound insulation properties and is easy to manufacture. Is the same.

It is sectional drawing of the grommet which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the state which attached the grommet shown in FIG. 1 to the vehicle body panel. It is sectional drawing which shows the modification 1 of 1st Embodiment. It is an exploded sectional view of a grommet concerning a 2nd embodiment of the present invention. (A) (B) is explanatory sectional drawing which shows the mounting | wearing operation | work to the wire harness of the grommet shown in FIG. It is sectional drawing which shows the state which attached the grommet shown in FIG. 4 to the vehicle body panel. It is a principal part expanded sectional view which shows the modification 1 of 2nd Embodiment. It is a principal part expanded sectional view which shows the modification 2 of 2nd Embodiment. It is an exploded sectional view of a grommet concerning a 2nd embodiment of the present invention. (A) (B) is explanatory sectional drawing which shows the mounting | wearing operation | work to the wire harness of the grommet shown in FIG. It is sectional drawing which shows the state which attached the grommet shown in FIG. 9 to the vehicle body panel. It is a figure which shows a prior art example.

Explanation of symbols

10 (20, 40) Grommet 11 Small diameter cylindrical portion 12 Large diameter cylindrical portion 13 Large diameter cylindrical portion 18 First flap 19 Second flap 60 Body panel 61 Through hole 62 Sound insulation material 70 Wire harness S1 First sound absorbing air layer S2 First 2 Air layer for sound absorption

Claims (3)

A small-diameter cylindrical portion that is inserted in close contact with a wire harness that is routed in a vehicle, a large-diameter cylindrical portion that is continuous with one end of the small-diameter cylindrical portion, and a large-diameter cylindrical portion that is continuous with the tip on the large-diameter side of the large-diameter cylindrical portion And a grommet made of an elastic material including an annular vehicle body locking recess that fits into a through hole of a vehicle body panel provided on the outer peripheral surface of the large diameter cylindrical portion,
The outer peripheral surface of the small-diameter cylindrical portion includes a first flap and a second flap that protrude in a conical shape with an interval in the axial direction toward the enlarged-diameter cylindrical portion side,
The first flap is sized to abut on the surface of the sound insulating material laminated on one side of the vehicle body panel so as to surround the through hole, and the second flap has a periphery abutting on the sound insulating material. The first flap, the enlarged-diameter cylindrical portion, and the large-diameter cylinder are attached to the vehicle body panel in such a size that the first flap is in contact with each other or the peripheral edge of the second flap is in direct contact with the sound insulating material. And a first sound-absorbing air layer surrounded by the opening periphery of the sound insulating material, and a second sound-absorbing air layer surrounded by the first flap, the second flap, and the small-diameter cylindrical portion. Grommet characterized by that. A small-diameter cylindrical portion that is inserted in close contact with a wire harness that is routed in a vehicle, a large-diameter cylindrical portion that is continuous with one end of the small-diameter cylindrical portion, and a large-diameter cylindrical portion that is continuous with the tip on the large-diameter side of the large-diameter cylindrical portion And a grommet made of an elastic material including an annular vehicle body locking recess that fits into a through hole of a vehicle body panel provided on the outer peripheral surface of the large diameter cylindrical portion,
A retrofit member attached to the small-diameter cylindrical portion is provided, and the retrofit member is connected to or externally attached to the main body-side small-diameter cylindrical portion, and an axial direction from the outer peripheral surface of the retrofit-side small-diameter cylindrical portion. A first flap and a second flap projecting in a conical shape with a gap therebetween,
The first flap is sized to abut on the surface of the sound insulating material laminated on one side of the vehicle body panel so as to surround the through hole, and the second flap has a periphery abutting on the sound insulating material. The first flap, the enlarged-diameter cylindrical portion, and the large-diameter cylindrical portion in a state where the first flap is in contact with the first flap or the peripheral edge of the second flap is in direct contact with the sound insulating material and attached to the vehicle body panel. And a first sound-absorbing air layer surrounded by the opening periphery of the sound-insulating material, and a second sound-absorbing air layer surrounded by the first flap, the second flap, and the rear-side small-diameter cylindrical portion. Grommet characterized by that.   The retrofitting member forms a step-shaped recess having a square cross section by connecting the rear end surface of the retrofitting side small diameter cylindrical portion and the inner peripheral surface of the first flap, and the retrofitting member is used as a grommet. When attached, the rear end surface of the rear-side small-diameter cylindrical portion serving as the bottom surface of the stepped recess is projected from the opening-side end surface of the main-body-side small-diameter cylindrical portion or the outer peripheral surface of the main-body-side small-diameter cylindrical portion. The grommet according to claim 2, wherein the grommet is configured to be positioned by being abutted against the abutment rib.

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