JP2012239321A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a grommet to inhibit sound leakage around an attachment part attached to a through hole of a vehicle body panel.SOLUTION: A grommet 20 is attached to a through hole 12 formed at a vehicle body panel 10 being fitted onto a wiring harness 18. The grommet 20 includes: a cylindrical wiring harness support part 22 into which the wiring harness 18 is inserted; a panel attachment part 30 connected with the wiring harness support part 22 and having an engagement recess part 31 engaging with an inner peripheral part of the through hole 12 in a position located around an axial core of the wiring harness support part 22; and an umbrella shaped part 40 formed by an elastic material and extending from a position, which is located in an outer peripheral part of the wiring harness support part 22 and is separated from the panel attachment part 30, to the panel attachment part 30 so as to expand larger than the engagement recess part 31.

Description

  The present invention relates to a grommet that is attached to a through hole formed in a vehicle body panel in a state of being sheathed on a wire harness.

  Conventionally, as this kind of grommet, there is one disclosed in Patent Document 1.

  In Patent Document 1, a vehicle body locking recess is formed on the outer periphery of the grommet. And the grommet is attached to the vehicle body panel by fitting the peripheral edge portion of the through hole formed in the vehicle body panel into the vehicle body locking recess.

JP 2002-369345 A

  By the way, if a sound insulation material such as a nonwoven fabric is attached to the vehicle body panel, it is possible to improve sound insulation between the two spaces defined by the vehicle body panel.

  However, even in this case, it is difficult to suppress sound leakage around the vehicle body locking recess of the grommet.

  Therefore, an object of the present invention is to suppress sound leakage around the portion where the grommet is attached to the through hole of the vehicle body panel.

  In order to solve the above-mentioned problem, a first aspect is a grommet mounted in a through-hole formed in a vehicle body panel in a state of being externally mounted on a wire harness, and is a cylindrical shape through which the wire harness is inserted and supported. A wire harness support part, a panel attachment part connected to the wire harness support part and having a locking recess capable of locking the inner peripheral edge of the through hole at a position around the axis of the wire harness support part; An umbrella shape formed of a material and extending from the outer peripheral portion of the wire harness support portion and away from the panel mounting portion toward the panel mounting portion so as to expand larger than the locking recess. A part.

  A 2nd aspect is a grommet which concerns on a 1st aspect, Comprising: The said panel attachment part is the connection which supports the annular part in which the said latching recessed part was formed, and the said annular part in the said wire harness support part outer position. The umbrella-shaped portion is configured to be elastically deformable so that an outer peripheral edge portion of the umbrella-shaped portion is disposed between the wire harness support portion and the annular portion.

  A 3rd aspect is a grommet which concerns on a 2nd aspect, Comprising: The said connection part is formed so that elastic deformation is possible so that the said cyclic | annular part may be moved along the axial direction of the said wire harness support part.

  A 4th aspect is a grommet concerning any one 1st-3rd aspect, Comprising: The said panel attachment part and the resin molding part which has a collar part which can contact | abut to the inner peripheral edge part of the said through-hole, The mounting portion to which the resin molded portion is attached is formed, and the mounting portion, the wire harness support portion, and the umbrella-shaped portion are integrally formed of an elastic material.

  A fifth aspect is the grommet according to any one of the first to fourth aspects, wherein the umbrella-shaped portion has a plurality of thicknesses extending radially from the tapered end portion toward the outer peripheral edge portion. It has a thin part and a thin part thinner than the thick part interposed between the plurality of thick parts.

  According to the grommet which concerns on a 1st aspect, it is formed with an elastic material, and is the outer peripheral part of the said wire harness support part, from the position away from the said panel attachment part, from the said latching recessed part toward the said panel attachment part. In addition, the outer peripheral edge of the umbrella-shaped portion is engaged with the locking recess while the inner peripheral edge of the through hole is locked to the locking recess. It can be made to contact with a body panel on the outer peripheral side. Thereby, it aims at suppressing the sound leakage around the attachment part of a grommet and the through-hole of a vehicle body panel.

  According to the second aspect, since the umbrella-shaped portion is configured to be elastically deformable so that the outer peripheral edge portion of the umbrella-shaped portion is disposed between the wire harness support portion and the annular portion, In this state, the grommet can be easily inserted into the through hole.

  According to the 3rd aspect, a connection part elastically deforms so that the said annular part may be moved along the axial direction of the said wire harness support part, and an outer peripheral part of an umbrella-shaped part is a wire harness support part and an annular part. Can be easily pulled out from between.

  According to the fourth aspect, since the part in which the collar portion capable of contacting the inner peripheral edge portion of the through hole is formed as the resin molded portion and this is mounted on the mounting portion of the panel mounting portion, the through hole The shape to be locked can be easily formed.

  According to the fifth aspect, the umbrella-shaped portion includes a plurality of thick portions extending radially from the tapered end portion toward the outer peripheral edge portion, and the thick wall interposed between the plurality of thick portions. Since the thin-walled portion is thinner than the thin-walled portion, the umbrella-shaped portion can be easily reduced in diameter by being elastically deformed mainly at the thin-walled portion. On the other hand, the umbrella-shaped portion can be expanded by the thick-walled portion and maintained in a state of being pressed against the vehicle body panel.

It is a front view which shows the state which attached the grommet which concerns on embodiment to the vehicle body panel. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is explanatory drawing which shows the procedure which attaches a grommet to a vehicle body panel. It is explanatory drawing which shows the procedure which attaches a grommet to a vehicle body panel.

  Hereinafter, the grommet according to the embodiment will be described. 1 is a front view showing a state in which a grommet 20 according to an embodiment is attached to a vehicle body panel 10, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG.

  The grommet 20 is attached to the through hole 12 formed in the vehicle body panel 10 in a state where the grommet 20 is sheathed on the wire harness 18.

  Here, the vehicle body panel 10 is a plate-like member that partitions a space in the vehicle. As the vehicle body panel 10, for example, a panel that partitions a vehicle compartment (the right side in FIG. 2) and an engine room (the left side in FIG. 2) is assumed. A through hole 12 is formed in the vehicle body panel 10. The through hole 12 is often circular, but may be an oval or polygonal hole. Here, an annular protrusion 13 is formed on the peripheral edge of the through-hole 12 so as to protrude to one main surface side (here, the engine room side) of the vehicle body panel 10. A sound insulation layer 14 is provided on at least one main surface of the vehicle body panel 10 (here, the surface on the engine room side). The sound insulation layer 14 is formed of a nonwoven fabric, a rubber plate, a foam layer, or the like, and imparts sound insulation to the vehicle body panel 10. The sound insulation layer 14 has an opening 15 that opens largely around the through hole 12. The diameter of the opening 15 is larger than the diameter of the through hole 12.

  The wire harness 18 has a plurality of bundled electric wires. By arranging the wire harness 18 through the through hole 12, the wire harness 18 is used as a wiring for electrically connecting electrical devices between two spaces defined by the vehicle body panel 10.

  The grommet 20 includes a wire harness support part 22, a panel attachment part 30, and an umbrella-like part 40.

  The wire harness support portion 22 is configured to be able to support the inserted wire harness 18. Here, the wire harness support part 22 is formed in a cylindrical shape through which the wire harness 18 can be inserted. For example, the wire harness 18 is supported by the wire harness support portion 22 as follows. First, the inner diameter of the wire harness support portion 22 is set to be smaller than the outer diameter of the wire harness 18 to be supported, and the wire harness support portion 22 formed of an elastic material is expanded and the wire is placed inside. If the harness support part 22 is inserted and then the wire harness support part 22 is elastically deformed to the original shape, the wire harness support part 22 tightens the wire harness 18 so that the wire harness 18 can be fixed. . Moreover, the wire harness 18 can be fixed by winding an adhesive tape etc. around the end part of the wire harness support part 22 and the wire harness 18 extended from the said end part.

  The panel attachment portion 30 is connected to the wire harness support portion 22 and has a locking recess 31 that can lock the inner peripheral edge portion of the through hole 12 at a position around the axis of the wire harness support portion 22. The locking recess 31 is locked to the inner peripheral edge of the through hole 12, so that the grommet 20 is attached to the through hole 12 of the vehicle body panel 10.

  Here, the panel mounting portion 30 has an annular portion 32 and a connecting portion 36.

  The annular portion 32 is formed in an annular shape having a diameter substantially the same as the outer diameter of the through hole 12 and a diameter larger than the outer diameter of the wire harness support portion 22. On the outer periphery of the panel mounting portion 30, the annular locking recess 31 that opens to the outer peripheral side is formed. The locking recess 31 has an annular bottom whose outer diameter is substantially the same as the inner diameter of the inner peripheral edge of the through hole 12, and the width dimension in the axial direction of the through hole 12 is the thickness dimension of the inner peripheral edge of the through hole 12 ( Here, it is formed in a shape that is substantially the same as the projecting dimension of the annular protrusion 13. Then, by fitting the inner peripheral edge portion into the locking recess 31, the panel mounting portion 30 is fixed to the through hole 12 of the vehicle body panel 10 without rattling.

  Here, the annular portion 32 has a resin molded portion 33 and a mounting portion 34.

  The resin molded portion 33 is a part integrally molded with a resin such as polypropylene (PP), and has higher rigidity than a portion formed of an elastic material such as the mounting portion 34. The resin molded portion 33 has a short cylindrical portion 33a, a mounting flange portion 33b, and a locking flange portion 33c. The outer diameter of the short cylindrical portion 33a is set to be substantially the same as the inner diameter of the inner peripheral edge portion, and the short cylindrical portion 33a can be disposed in the inner peripheral edge portion in contact with the inner peripheral edge portion. Yes. Further, the mounting flange 33b protrudes in an annular shape from one end of the short cylindrical portion 33a, and the locking flange 33c is located at a position separated from the mounting flange 33b by the edge thickness dimension of the inner peripheral edge or more of the short cylindrical portion 33a. It protrudes annularly from the outer periphery. And an inner peripheral edge part can be arrange | positioned now between the attachment collar part 33b and the latching collar part 33c. Further, the other end portion of the short cylindrical portion 33a protrudes on the opposite side of the mounting flange portion 33b with respect to the locking flange portion 33c.

  The outer surface of the other end portion of the short cylindrical portion 33a and the outward surface of the locking collar portion 33c are arranged in addition to the short cylindrical portion 33a so that the operation of pushing the resin molded portion 33 into the through hole 12 can be easily performed. It is formed in a taper shape that gradually decreases in diameter toward the outside of the end.

  The mounting portion 34 is a portion formed of an elastic material such as an elastomer including rubber. Here, the mounting portion 34 is integrally formed of a mold with an elastic material together with the connecting portion 36, the wire harness support portion 22, and the umbrella-like portion 40. The mounting portion 34 is formed in an annular shape having an outer diameter larger than the inner diameter of the inner peripheral edge of the through hole 12, and can be disposed on the other main surface side of the vehicle body panel 10 at the peripheral edge of the through hole 12. It has become. Further, on the inner peripheral portion of the mounting portion 34, a flange mounting recess 34a into which the mounting flange 33b can be fitted is formed. The resin molding portion 33 is mounted on the mounting portion 34 by fitting the mounting flange portion 33b into the flange mounting recess portion 34a. In this state, the locking recess 31 formed by a pair of opposing surfaces of the mounting flange 33b and the locking flange 33c and the outer surface of the short cylindrical portion 33a is formed.

  The connecting part 36 is configured to be able to support the annular part 32 at a position outside the wire harness support part 22. More specifically, the connection part 36 is the outer peripheral part of the wire harness support part 22, and protrudes outward from the position from the middle rather than the one end part. Moreover, the outer peripheral part of the connection part 36 and the mounting part 34 are connected integrally. Thereby, the annular part 32 is supported at the outer position of the wire harness support part 22 in a state where the center axis of the annular part 32 and the center axis of the wire harness support part 22 are matched.

  In addition, the connecting portion 36 has a shape that undulates in a vertical section along the axial direction of the wire harness support portion 22 while projecting outward of the wire harness support portion 22. In other words, the connecting portion 36 has a hook shape that protrudes outward from the wire harness support portion 22, and is on one side of the wire harness support portion 22 in the axial direction around the axis of the wire harness support portion 22. It is formed in a shape having an annular convex portion that is convex. And the annular part 32 is supported so as to be movable along the axial direction of the wire harness support part 22 by elastically deforming the connection part 36 so that the uneven part of the connection part 36 is stretched or elastically restored. ing.

  That is, in the normal state, the connecting portion 36 supports the annular portion 32 at a position from the middle of the wire harness support portion 22 (see FIG. 2). In this state, the umbrella-shaped portion 40 is elastically deformed so that most of the umbrella-shaped portion 40 can be disposed between the wire harness support portion 22 and the annular portion 32. Further, when the annular portion 32 is moved along the axial direction of the wire harness support portion 22 in one end direction (a direction away from the umbrella-shaped portion 40) so as to extend the connecting portion 36, the umbrella-shaped portion 40 All or most (here, most of the umbrella-shaped portion 40) is detached from between the wire harness support portion 22 and the annular portion 32, and the umbrella-shaped portion 40 is removed from between the wire harness support portion 22 and the annular portion 32. It can be easily extracted.

  But it is essential that the outer peripheral edge part of the umbrella-shaped part 40 can be arrange | positioned between the wire harness support part 22 and the annular part 32, and that the annular part 32 can be moved to the axial direction of the wire harness support part 22. is not.

  The umbrella-shaped portion 40 is a portion formed of an elastic material, and is located on the outer periphery of the wire harness support portion 22 from the position away from the panel mounting portion 30 toward the panel mounting portion 30 than the locking recess 31. It extends so as to expand greatly.

  More specifically, the umbrella-shaped portion 40 is integrally connected to the outer periphery of the wire harness support portion 22 and between the connection portion 36 and the other end portion of the wire harness support portion 22. The umbrella-shaped part 40 is formed in a shape extending from the connecting part so as to gradually expand toward the annular part 32. Here, the umbrella-shaped part 40 is formed in a shape corresponding to a side surface of a pyramid (here, an octagonal pyramid). The most widened outer peripheral edge portion of the umbrella-shaped portion 40 is set to a size that covers the sound insulating layer 14 while being in contact with the sound insulating layer 14. In other words, the outer peripheral edge that expands most among the umbrella-shaped portions 40 is larger than the opening 15 of the sound insulation layer 14 in a state of being in contact with the sound insulation layer 14.

  Moreover, the extension length of the umbrella-shaped part 40 is set to a size larger than reaching the annular part 32, and at least the outer peripheral edge part of the umbrella-shaped part 40 is connected to the wire harness support part 22 and the annular part 32. It can be arranged between the two. And the umbrella-shaped part 40 can be arrange | positioned now between the wire harness support part 22 and the annular part 32 by elastically deforming.

  Further, the outer peripheral edge portion of the umbrella-shaped portion 40 in the original shape is a main portion on the side where the umbrella-shaped portion 40 of the through-hole 12 is disposed in a state where the inner peripheral edge portion of the through-hole 12 is locked to the locking recess 31. Set to reach the surface.

  The umbrella-shaped portion 40 includes a plurality of thick portions 42 extending from the tapered end portion (portion connected to the wire harness support portion 22) toward the outer peripheral edge portion, and the plurality of thick portions 42. And a thin portion 44 interposed therebetween.

  Here, the long part corresponding to the side of the pyramid in the umbrella-like part 40 is formed in the thick part 42 having a long shape (here, a round bar shape). Moreover, the triangular part between each thick part 42 of the umbrella-shaped part 40 is formed in the thin part 44 whose thickness is smaller than the said thick part.

  But it is not essential that the umbrella-shaped part 40 is the said shape. The umbrella-shaped portion 40 may have a shape corresponding to the side surface of the cone. Further, the umbrella-shaped portion 40 may have a shape that expands while curving so as to protrude outward or inward from the base end portion toward the distal end portion. That is, the outer peripheral edge on the front end side of the umbrella-shaped portion 40 can contact the vehicle body panel 10 (preferably, the sound insulation layer 14 portion) on the outer periphery of the through hole 12 of the vehicle body panel 10. A space useful for sound insulation may be formed between the vehicle body panel 10 and the vehicle body panel 10.

  Moreover, it is not essential that the umbrella-shaped part 40 is provided with the thick part 42 and the thin part 44, and you may form in uniform thickness in the circumferential direction.

  A procedure for mounting the grommet 20 configured as described above in the through hole 12 of the vehicle body panel 10 will be described.

  First, the wire harness 18 is inserted into the wire harness support portion 22 and fixed to the wire harness support portion 22. And the outer periphery part of the umbrella-shaped part 40 is arrange | positioned between the wire harness support part 22 and the annular part 32 (refer FIG. 4). At this time, the outer peripheral edge portion of the umbrella-shaped portion 40 is easily disposed between the wire harness support portion 22 and the annular portion 32 by moving the annular portion 32 to the side far from the connecting portion of the annular portion 32. Can do. Moreover, the umbrella-shaped portion 40 can be easily reduced in diameter by deforming the thin portion 44 inward or outward between the thick portions 42.

  Note that either the support operation of the wire harness 18 with respect to the wire harness support portion 22 or the operation of disposing the outer peripheral edge portion of the umbrella-shaped portion 40 between the wire harness support portion 22 and the annular portion 32 is performed first. It may be broken. Moreover, the operation | work which arrange | positions the outer periphery part of the umbrella-shaped part 40 between the wire harness support part 22 and the annular part 32 may be abbreviate | omitted. In this case, in a state where the umbrella-shaped portion 40 is reduced in diameter and deformed by hand, or in a state where the umbrella-shaped portion 40 is pressed against the inner peripheral edge of the through-hole 12 and reduced in diameter, the penetration described later is performed. What is necessary is just to perform the insertion operation | work etc. to the hole 12.

  Next, the other end portions of the wire harness 18 and the wire harness support portion 22 are inserted into the through hole 12, and then the resin molded portion 33 is pushed into the through hole 12. Then, the resin-molded portion 33 is elastically deformed so as to reduce its diameter, and when the locking collar 33c gets over the inner peripheral edge of the through-hole 12, the inner peripheral edge of the through-hole 12 becomes the mounting flange 33b and the locking flange. It latches in the latching recessed part 31 comprised by a pair of opposing surface of the part 33c, and the outer surface of the short cylindrical part 33a.

  After that, when the wire harness support part 22 is moved in a direction relatively away from the annular part 32 while elastically deforming the connecting part 36 so as to stretch, all or most of the umbrella-like part 40 is wire. It comes off from the harness support part 22 and the annular part 32. In this state, the umbrella-shaped portion 40 is pulled outward, and the outer peripheral edge of the umbrella-shaped portion 40 is covered by the elastic force of the umbrella-shaped portion 40 so as to cover the sound insulating layer 14 around the through hole 12 and the opening 15. Let In this state, the thick wall portion 42 of the umbrella-like portion 40 provides an elastic force that firmly presses the outer peripheral edge portion of the umbrella-like portion 40 toward the sound insulating layer 14.

  In this state, a space surrounded by the vehicle body panel 10 and the umbrella-shaped portion 40 is formed around the part of the grommet 20 that is locked to the through hole 12. With this space, a sound insulation effect can be obtained. Moreover, since the umbrella-shaped portion 40 also covers the inner peripheral side of the portion of the grommet 20 that is locked to the through hole 12, a space surrounded by the umbrella-shaped portion 40 and the connecting portion 36 is formed at the portion. Yes. A sound insulation effect can also be obtained at this portion.

  According to the grommet 20 configured as described above, the locking grommet 31 is formed of an elastic material and is the outer peripheral portion of the wire harness support portion 22 from the position away from the panel mounting portion 30 toward the panel mounting portion 30 than the locking recess 31. Since the umbrella-shaped portion 40 extends so as to expand greatly, the outer peripheral edge portion of the umbrella-shaped portion 40 is held in a state where the inner peripheral edge portion of the through hole 12 is locked to the locking recess 31. The vehicle body panel 10 can be brought into contact with the outer periphery of the locking recess 31. Thereby, the space enclosed by the vehicle body panel 10 and the umbrella-shaped part 40 can be formed, and the sound leakage around the attachment part of the grommet 20 and the through-hole 12 can be suppressed.

  Moreover, since the umbrella-shaped part 40 is comprised so that elastic deformation can be carried out so that the outer periphery part of the umbrella-shaped part 40 may be arrange | positioned between the wire harness support part 22 and the cyclic | annular part 32, it is a grommet in this state. 20 can be easily inserted into the through hole 12.

  Moreover, since the connection part 36 is elastically deformed so as to move the annular part 32 along the axial direction of the wire harness support part 22, the outer peripheral edge part of the umbrella-like part 40 is connected to the wire harness support part 22 and the annular part 32. It is possible to easily dispose the outer peripheral edge portion of the umbrella-shaped portion 40 from the space.

  Further, when the umbrella-shaped portion 40 is formed, it is difficult to form a complicated shape inside the umbrella-shaped portion 40 due to the shape of the mold. Therefore, since the part formed with the locking collar portion 33c that can be brought into contact with the inner peripheral edge portion of the through-hole 12 is used as the resin molding portion 33, and this is configured to be mounted on the mounting flange portion 33b of the panel mounting portion 30, The shape to be engaged with the through hole 12 can be easily formed. In addition, since the locking flange portion 33c of the resin molded portion 33 is configured to be locked to the through hole 12 in a retaining manner, the locking flange portion 33c is pushed by pushing the resin molded portion 33 into the through hole 12. It is easy to realize a configuration in which the through hole 12 is easily locked, and the grommet 20 can be firmly fixed to the through hole 12.

  In addition, the umbrella-shaped portion 40 includes a plurality of thick portions 42 extending radially from the tapered end portion toward the outer peripheral edge portion, and a thin portion 44 interposed between the plurality of thick portions 42. Therefore, the umbrella-shaped portion 40 can be easily reduced in diameter by being elastically deformed mainly by the thin-walled portion 44. Moreover, since the force which presses the outer periphery part of the umbrella-shaped part 40 to the vehicle body panel 10 is fully obtained by the thick part 42, the umbrella-shaped part 40 is expanded and the surface (here, The state of being in close contact with the surface of the sound insulating layer 14 can be maintained.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Body panel 12 Through-hole 18 Wire harness 20 Grommet 22 Wire harness support part 30 Panel attachment part 32 Annular part 33 Resin molding part 33c Locking hook part 34 Mounting part 36 Connection part 40 Umbrella part 42 Thick part 44 Thin part

Claims (5)

A grommet attached to a through-hole formed in a vehicle body panel in a state where it is sheathed on a wire harness,
A tubular wire harness support part through which the wire harness is inserted and supported; and
A panel mounting portion connected to the wire harness support portion and having a locking recess capable of locking the inner peripheral edge of the through-hole at a position around the axis of the wire harness support portion;
An umbrella formed of an elastic material and extending from the outer peripheral portion of the wire harness support portion away from the panel mounting portion toward the panel mounting portion so as to expand larger than the locking recess. And
Grommet with. The grommet according to claim 1,
The panel mounting portion includes an annular portion in which the locking recess is formed, and a connecting portion that supports the annular portion at an outer position of the wire harness support portion,
The grommet which is comprised so that the said umbrella-shaped part can be elastically deformed so that the outer-periphery edge part of the said umbrella-shaped part may be arrange | positioned between the said wire harness support part and the said annular part. The grommet according to claim 2,
The said connection part is a grommet which can be elastically deformed so that the said annular part may be moved along the axial direction of the said wire harness support part. The grommet according to any one of claims 1 to 3, wherein
The panel mounting portion includes a resin molded portion having a collar portion capable of contacting an inner peripheral edge portion of the through hole, and a mounting portion to which the resin molded portion is mounted,
The grommet in which the mounting portion, the wire harness support portion, and the umbrella-shaped portion are integrally formed of an elastic material. The grommet according to any one of claims 1 to 4, wherein
The umbrella-shaped portion includes a plurality of thick portions extending radially from the tapered end toward the outer peripheral edge, and a thin portion thinner than the thick portions interposed between the plurality of thick portions. Having a grommet.

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