JP2017175742A - Grommet - Google Patents

Grommet Download PDF

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Publication number
JP2017175742A
JP2017175742A JP2016057811A JP2016057811A JP2017175742A JP 2017175742 A JP2017175742 A JP 2017175742A JP 2016057811 A JP2016057811 A JP 2016057811A JP 2016057811 A JP2016057811 A JP 2016057811A JP 2017175742 A JP2017175742 A JP 2017175742A
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Japan
Prior art keywords
diameter cylindrical
cylindrical portion
grommet
small
annular groove
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JP2016057811A
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Japanese (ja)
Inventor
亮 末永
Akira Suenaga
亮 末永
剛誠 小林
Takemasa Kobayashi
剛誠 小林
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Sumitomo Wiring Systems Ltd
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Sumitomo Wiring Systems Ltd
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Priority to JP2016057811A priority Critical patent/JP2017175742A/en
Priority to PCT/JP2017/008233 priority patent/WO2017163801A1/en
Publication of JP2017175742A publication Critical patent/JP2017175742A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings

Abstract

PROBLEM TO BE SOLVED: To provide a grommet of a new structure, reducing insertion force to a through hole, while securing the waterproofness of the grommet.SOLUTION: A grommet 10 includes: a small diameter cylinder part 14 which is fixed to the outer peripheral surface of a wiring harness 12; a large diameter cylinder part 20 which is fixed to a through hole 18 of a fixing member 16; and an extended diameter cylinder part 22 which connects the small diameter cylinder part 14 to the large diameter cylinder part 20. The grommet 10 further includes a protruded seal rib 30 which is disposed on the bottom face 28 of an annular recessed groove 26, having an opening on the outer peripheral surface of the large diameter cylinder part 20 to which the peripheral part of the through hole 18 is externally fit and fixed. On the bottom face 28 of the annular recessed groove 26, the seal rib 30 is formed to be protruded at a position deviating from a deformation region 34 of the peripheral wall 32 of the annular recessed groove 26 on the small diameter cylinder part side to the inside of the annular recessed groove 26.SELECTED DRAWING: Figure 3

Description

本発明は、ワイヤハーネスに外装された状態で、車体パネル等の固定部材に形成された貫通孔に装着されるグロメットに関するものである。   The present invention relates to a grommet that is attached to a through-hole formed in a fixing member such as a vehicle body panel in a state of being sheathed on a wire harness.

従来から、自動車に配索されるワイヤハーネスが、エンジンルームなどの車室外と車室内を仕切る車体パネル等の固定部材を跨いで配索される場合には、グロメットが、ワイヤハーネスに外装された状態で、車体パネルに形成された貫通孔に装着されている。このグロメットは、ワイヤハーネスの外周面に密接して固定される小径筒部と、車体パネルの貫通孔に密嵌固定される環状凹溝が設けられた大径筒部と、それらの間を連結する拡径筒部が一体的に設けられた構造とされており、貫通孔を通じた車室外から車室内への水の浸入などが防止されるようになっている。   Conventionally, when a wire harness routed in an automobile is routed across a fixing member such as a vehicle body panel that divides the interior of the vehicle compartment from the outside of the vehicle compartment such as the engine room, the grommet has been sheathed on the wire harness. In the state, it is mounted in a through hole formed in the vehicle body panel. This grommet connects between a small-diameter cylindrical portion that is closely fixed to the outer peripheral surface of the wire harness, a large-diameter cylindrical portion that is provided with an annular concave groove that is closely fitted and fixed to a through-hole of the vehicle body panel, and a gap between them. The diameter-expanding cylindrical portion is integrally provided so that water can be prevented from entering the vehicle compartment from the outside through the through hole.

ところで、かかるグロメットを車体パネルの貫通孔に高い防水性を持って密嵌固定するために、実開平１−６８６２５号公報（特許文献１）等に記載されているように、大径筒部の環状凹溝の底面に、貫通孔の周縁部に当接して押しつぶされるシールリブを突設して設けた構造が広く採用されている。   By the way, in order to tightly fix and fix such a grommet in the through hole of the vehicle body panel with high waterproofness, as described in Japanese Utility Model Publication No. 1-68625 (Patent Document 1), etc., A structure is widely adopted in which a seal rib is provided on the bottom surface of the annular groove so as to protrude and abut against the peripheral edge of the through hole.

ところが、このようなシールリブが大径筒部の環状凹溝の底面に突設されていると、グロメットの貫通孔への挿入作業に必要な挿入力が大きくなる傾向にあった。すなわち、グロメットを小径筒部側から車体パネルの貫通孔に挿通して、拡径筒部や大径筒部を圧縮変形させつつ貫通孔を通過させて、大径筒部の環状凹溝に貫通孔の周縁部を嵌め入れる際に、環状凹溝を画成する小径筒部側周壁部が環状凹溝の内部に倒れ込むように変形する。その際、小径筒部側周壁部が環状凹溝の底面に設けられたシールリブに当接することで、小径筒部側周壁部の変形が制限されて、大径筒部の小径筒部側周壁部が貫通孔を乗り越える際の挿入力が高くなることが避けられなかったのである。   However, when such a seal rib is provided on the bottom surface of the annular groove of the large-diameter cylindrical portion, the insertion force required for the insertion operation into the through hole of the grommet tends to increase. That is, the grommet is inserted into the through hole of the vehicle body panel from the small diameter cylindrical part side, and is passed through the through hole while compressing and deforming the enlarged diameter cylindrical part or the large diameter cylindrical part, and penetrates the annular concave groove of the large diameter cylindrical part. When the peripheral edge of the hole is fitted, the small-diameter cylindrical portion side peripheral wall portion that defines the annular groove is deformed so as to fall into the annular groove. At that time, the deformation of the small-diameter cylindrical portion side peripheral wall portion is restricted by the small-diameter cylindrical portion-side peripheral wall portion coming into contact with the seal rib provided on the bottom surface of the annular groove, and the small-diameter cylindrical portion-side peripheral wall portion of the large-diameter cylindrical portion is limited. It was inevitable that the insertion force at the time of passing over the through-hole increased.

実開平１−６８６２５号公報Japanese Utility Model Publication No. 1-68625

本発明は、上述の事情を背景に為されたものであって、その解決課題は、グロメットの防水性を確保しつつ、貫通孔への挿入力の低減を図ることができる、新規な構造のグロメットを提供することにある。   The present invention has been made in the background of the above-mentioned circumstances, and the solution to the problem is a novel structure capable of reducing the insertion force into the through-hole while ensuring the waterproofness of the grommet. To provide grommets.

本発明の第一の態様は、ワイヤハーネスの外周面に固定される小径筒部と、固定部材の貫通孔に固定される大径筒部と、前記小径筒部と前記大径筒部の間を連結する拡径筒部とを備え、前記大径筒部の外周面に開口して前記貫通孔の周縁部が外嵌固定される環状凹溝の底面に、シールリブが突設されてなるグロメットにおいて、前記シールリブが、前記環状凹溝の前記底面において、前記環状凹溝の小径筒部側周壁部の前記環状凹溝内方への変形領域を外れた位置に突設されていることを特徴とする。   The first aspect of the present invention includes a small-diameter cylindrical portion that is fixed to the outer peripheral surface of the wire harness, a large-diameter cylindrical portion that is fixed to a through-hole of the fixing member, and a space between the small-diameter cylindrical portion and the large-diameter cylindrical portion. A grommet having a sealing rib projecting from a bottom surface of an annular groove that opens to an outer peripheral surface of the large-diameter cylindrical portion and is fitted and fixed to a peripheral edge portion of the through-hole. In the above, the seal rib protrudes from the bottom surface of the annular groove at a position outside the deformation region inwardly of the annular groove on the side wall of the small diameter cylindrical portion of the annular groove. And

本態様によれば、環状凹溝の底面に突設されたシールリブが、環状凹溝の小径筒部側周壁部の環状凹溝内容への変形領域を外れた位置に突設されていることから、大径筒部における小径筒部側周壁部が貫通孔を通過するために環状凹溝の内方に倒れ変形する際に、シールリブに当接して小径筒部側周壁部の変形が制限乃至は阻止されることが未然に防止されている。それゆえ、貫通孔を通過する際に小径筒部側周壁部の変形がスムーズに許容されて、挿入力の低減が図られる。   According to this aspect, the seal rib protruding from the bottom surface of the annular groove protrudes from a position outside the deformation region of the annular groove side peripheral wall portion of the annular groove to the annular groove content. When the small-diameter cylindrical portion side peripheral wall portion of the large-diameter cylindrical portion falls through the through-hole and deforms inwardly of the annular concave groove, the deformation of the small-diameter cylindrical portion-side peripheral wall portion is restricted or abutted against the seal rib. It is prevented from being blocked. Therefore, when passing through the through hole, deformation of the small-diameter cylindrical portion side peripheral wall portion is allowed smoothly, and the insertion force can be reduced.

しかも、シールリブが、小径筒部側周壁部の環状凹溝内方への変形領域を外れた位置において、環状凹溝の底面に突設されていることから、シールリブによるグロメットの防水性の確保は担保されている。   In addition, since the seal rib protrudes from the bottom surface of the annular groove at a position outside the deformation region inwardly of the annular groove on the side wall of the small-diameter cylindrical portion, the waterproofness of the grommet by the seal rib is ensured. It is secured.

なお、小径筒部側周壁部の環状凹溝内方への変形領域とは、小径筒部側周壁部が底面へ向かって倒れ変形した場合に、小径筒部側周壁部の頂部がとおる軌跡と底面によって囲われた領域を言う。   The deformation region of the small-diameter cylindrical portion side peripheral wall portion toward the inside of the annular concave groove is a trajectory that the top of the small-diameter cylindrical portion-side peripheral wall portion passes when the small-diameter cylindrical portion-side peripheral wall portion collapses toward the bottom surface. The area surrounded by the bottom.

本発明の第二の態様は、前記第一の態様に記載のものにおいて、前記環状凹溝の大径筒部側周壁部にサブシールリブが突設されているものである。   According to a second aspect of the present invention, in the first aspect, a sub seal rib projects from the large-diameter cylindrical portion side peripheral wall portion of the annular groove.

本態様によれば、大径筒部側周壁部にサブシールリブが突設されていることから、環状凹溝の底面に突設されたシールリブが小径筒部側周壁部の変形領域を外れた位置、すなわち、大径筒部側周壁部に比較的近寄った部位に設けられていることにより、環状凹溝の底面が貫通孔の周縁部に対して斜交するおそれが低減されており、グロメットを一層安定して貫通孔に装着することができる。   According to this aspect, since the sub seal rib protrudes from the large-diameter cylindrical portion side peripheral wall portion, the position where the seal rib protruded from the bottom surface of the annular concave groove deviates from the deformation region of the small-diameter cylindrical portion peripheral wall portion, That is, by being provided at a portion relatively close to the peripheral wall portion on the side of the large-diameter cylindrical portion, the possibility that the bottom surface of the annular groove is oblique to the peripheral portion of the through hole is reduced, and the grommet is further increased. It can be stably attached to the through hole.

本発明によれば、環状凹溝の底面に突設されたシールリブが、環状凹溝の小径筒部側周壁部の環状凹溝内容への変形領域を外れた位置に突設されていることから、大径筒部における小径筒部側周壁部が貫通孔を通過するために環状凹溝の内方に倒れ変形する際に、シールリブに当接して小径筒部側周壁部の変形が制限乃至は阻止されることが未然に防止されている。それゆえ、貫通孔を通過する際に小径筒部側周壁部の変形がスムーズに許容されて、挿入力の低減が図られる。しかも、シールリブが、小径筒部側周壁部の環状凹溝内方への変形領域を外れた位置にあることから、グロメットの防水性も担保されている。   According to the present invention, the seal rib projecting from the bottom surface of the annular groove is projected at a position out of the deformation region of the annular groove on the side wall of the small-diameter cylindrical portion toward the annular groove content. When the small-diameter cylindrical portion side peripheral wall portion of the large-diameter cylindrical portion falls through the through-hole and deforms inwardly of the annular concave groove, the deformation of the small-diameter cylindrical portion-side peripheral wall portion is restricted or abutted against the seal rib. It is prevented from being blocked. Therefore, when passing through the through hole, deformation of the small-diameter cylindrical portion side peripheral wall portion is allowed smoothly, and the insertion force can be reduced. And since the seal rib exists in the position which remove | deviated from the deformation | transformation area | region to the annular recessed groove inside of a small diameter cylinder part side peripheral wall part, the waterproofness of a grommet is also ensured.

本発明の一実施形態としてのグロメットがワイヤハーネスに外装された状態を示す斜視図。The perspective view which shows the state by which the grommet as one Embodiment of this invention was armored by the wire harness. 図１の正面図。The front view of FIG. 図２のＩＩＩ−ＩＩＩ断面図であって、固定部材に固定された状態を示す図。It is III-III sectional drawing of FIG. 2, Comprising: The figure which shows the state fixed to the fixing member. 本発明の一実施形態としてのグロメットの別の態様を示す断面図であって、図３に相当する図。It is sectional drawing which shows another aspect of the grommet as one Embodiment of this invention, Comprising: The figure corresponded in FIG.

以下、本発明の実施形態について、図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１〜３には、本発明の一実施形態としてのグロメット１０がワイヤハーネス１２に外装された状態が示されている。グロメット１０は、略円筒形状で軸方向（図３中、上下方向）に延びる小径筒部１４と、軸方向一方の側（図３中、下側）に位置して固定部材たる車体パネル１６に形成された貫通孔１８に嵌合される厚肉の大径筒部２０と、軸方向他方の側（図３中、上側）から大径筒部２０に向かって拡径して延出して小径筒部１４と大径筒部２０の間を連結するドーム状の拡径筒部２２とを備えて構成されており、ＥＰＤＭ（エチレンプロピレンゴム）、ＣＲ（クロロプレンゴム）、ＳＩ（シリコーンゴム）等のゴム材料によって一体的に形成されている。なお、以下の説明において、上方とは、図２，３中の上方、下方とは、図２，３中の下方を言うものとする。また、理解を容易とするため、図１〜３では、ワイヤハーネス１２を仮想線で記載している。   1 to 3 show a state in which a grommet 10 as an embodiment of the present invention is sheathed on a wire harness 12. The grommet 10 has a substantially cylindrical shape and a small-diameter cylindrical portion 14 that extends in the axial direction (vertical direction in FIG. 3), and a vehicle body panel 16 that is a fixed member located on one side in the axial direction (lower side in FIG. 3). A thick large-diameter cylindrical portion 20 fitted into the formed through-hole 18 and a small diameter by extending from the other axial side (upper side in FIG. 3) toward the large-diameter cylindrical portion 20. It is configured to include a dome-shaped enlarged diameter cylindrical portion 22 that connects between the cylindrical portion 14 and the large diameter cylindrical portion 20, and includes EPDM (ethylene propylene rubber), CR (chloroprene rubber), SI (silicone rubber), and the like. The rubber material is integrally formed. In the following description, “upper” means the upper side in FIGS. 2 and 3, and “lower” means the lower side in FIGS. Moreover, in order to make an understanding easy, in FIGS. 1-3, the wire harness 12 is described with the virtual line.

図３に示されているように、小径筒部１４は、グロメット１０の軸方向（図３中、上下方向）の略全長に亘って延出して構成されており、軸方向の両端部にはテープ固定部２４が形成されている。かかるテープ固定部２４は、図１に示されているように、その開口端部において径方向に対向する位置の周壁が略矩形状に切り欠かれた形状とされている。これにより、テープ固定部２４は径方向内方に向かって弾性変形可能とされていることから、テープ固定部２４の外周に図示しない結束テープを巻き付けることにより、テープ固定部２４を縮径して小径筒部１４をワイヤハーネス１２の外周面に固定できるようになっている。   As shown in FIG. 3, the small-diameter cylindrical portion 14 is configured to extend over substantially the entire length of the grommet 10 in the axial direction (vertical direction in FIG. 3). A tape fixing portion 24 is formed. As shown in FIG. 1, the tape fixing portion 24 has a shape in which a peripheral wall at a position facing the radial direction at the opening end portion is cut out in a substantially rectangular shape. As a result, the tape fixing part 24 can be elastically deformed inward in the radial direction, so that the tape fixing part 24 is reduced in diameter by winding a binding tape (not shown) around the outer periphery of the tape fixing part 24. The small diameter cylindrical portion 14 can be fixed to the outer peripheral surface of the wire harness 12.

一方、大径筒部２０には、図１〜３に示されているように、外周面に開口しかつ外周面の周方向の全周に亘って略矩形断面形状で延びる環状凹溝２６が形成されている。そして、かかる環状凹溝２６に対して、車体パネル１６に形成された円環状の貫通孔１８の周縁部が外嵌固定されることにより、本実施形態のグロメット１０が車体パネル１６に固定されるようになっている。また、環状凹溝２６の底面２８には、環状凹溝２６の全周に亘って略半円断面形状で環状に突出するシールリブ３０（図２，図３参照）が設けられている。かかるシールリブ３０は、図３中の拡大図に示されているように、環状凹溝２６の底面２８において、環状凹溝２６の小径筒部側周壁部３２の環状凹溝２６内方への変形領域３４を外れた位置に突設されている。ここでいう変形領域３４とは、グロメット１０を車体パネル１６に装着する際に、環状凹溝２６の小径筒部側周壁部３２が貫通孔１８を通過するために環状凹溝２６の内方に倒れ変形した場合に、小径筒部側周壁部３２の頂部３６がとおる軌跡３８と底面２８によって囲われた領域を言う。なお、理解を容易とするため、図３では、車体パネル１６を仮想線で記載すると共に、拡大図では、車体パネル１６を記載せずかつ軌跡３８を仮想線で記載している。   On the other hand, as shown in FIGS. 1 to 3, the large-diameter cylindrical portion 20 has an annular groove 26 that opens to the outer peripheral surface and extends in a substantially rectangular cross-sectional shape over the entire circumference in the circumferential direction of the outer peripheral surface. Is formed. And the grommet 10 of this embodiment is fixed to the vehicle body panel 16 by the outer peripheral part of the annular through-hole 18 formed in the vehicle body panel 16 being externally fitted and fixed to the annular groove 26. It is like that. In addition, a seal rib 30 (see FIGS. 2 and 3) is provided on the bottom surface 28 of the annular groove 26 so as to project in an annular shape with a substantially semicircular cross-sectional shape over the entire circumference of the annular groove 26. As shown in the enlarged view of FIG. 3, the seal rib 30 is deformed to the inside of the annular groove 26 on the bottom surface 28 of the annular groove 26. It protrudes at a position outside the region 34. The deformation region 34 here refers to the inside of the annular groove 26 because the small-diameter cylindrical portion side peripheral wall portion 32 of the annular groove 26 passes through the through hole 18 when the grommet 10 is attached to the vehicle body panel 16. The area surrounded by the locus | trajectory 38 and the bottom face 28 which the top part 36 of the small diameter cylinder part side peripheral wall part 32 passes when falling down is said. In order to facilitate understanding, in FIG. 3, the vehicle body panel 16 is described by virtual lines, and in the enlarged view, the vehicle body panel 16 is not described and the locus 38 is described by virtual lines.

拡径筒部２２には、図３に示されているように、小径筒部１４の外周側に離隔して配設された小径筒部側端部４０と、拡径筒部２２の内周面を小径筒部１４に連結する正面視で略Ｖ字断面形状の可撓性連結部４２を有して構成されている。また、図１〜２に示されているように、拡径筒部２２の外周面上には、周方向で相互に離隔して、大径筒部２０側から小径筒部側端部４０に向かって延出する正面視で略矩形状の複数（本実施形態では８個）の当接リブ４４が突設されている。かかる当接リブ４４の幅方向中央部分には、正面視で略矩形状の肉抜き孔４６が外周面に開口するように形成されている。   As shown in FIG. 3, the enlarged diameter cylindrical portion 22 includes a small diameter cylindrical portion side end 40 that is spaced apart from the outer peripheral side of the small diameter cylindrical portion 14, and an inner circumference of the enlarged diameter cylindrical portion 22. A flexible connecting portion 42 having a substantially V-shaped cross section in a front view connecting the surface to the small diameter cylindrical portion 14 is provided. Also, as shown in FIGS. 1 and 2, on the outer peripheral surface of the enlarged diameter cylindrical portion 22, they are separated from each other in the circumferential direction, from the large diameter cylindrical portion 20 side to the small diameter cylindrical portion side end 40. A plurality of contact ribs 44 (eight in the present embodiment) having a substantially rectangular shape in front view extending toward the front are projected. In the central portion of the contact rib 44 in the width direction, a substantially rectangular hollow hole 46 is formed on the outer peripheral surface when viewed from the front.

可撓性連結部４２は、図３に示されているように、拡径筒部２２の内周面における連結位置が、小径筒部側端部４０よりも大径筒部２０側にシフトした位置に構成されている。また、可撓性連結部４２を構成する拡径筒部側連結部４２ａと小径筒部側連結部４２ｂの間に広がる中間領域４８が、大径筒部２０側に向かって凸状に屈曲して形成されている。さらに、可撓性連結部４２の拡径筒部側連結部４２ａには、可撓性連結部４２の小径筒部側連結部４２ｂと略平行に延び出して、軸方向他方の側（図３中、上側）に向かって小径筒部１４と同心かつ大径とされた略円筒形状で小径筒部１４のテープ固定部２４に至らない位置まで延びる中間筒部５０が形成されている。中間筒部５０の延出端部にはテープ固定部５２が形成されている。かかるテープ固定部５２は、図１に示されているように、その開口端部において径方向に対向する位置の周壁が略矩形状に切り欠かれた形状とされている。これにより、テープ固定部５２は径方向内方に向かって弾性変形可能とされていることから、テープ固定部５２の外周に図示しない結束テープを巻き付けることにより、テープ固定部５２を縮径して中間筒部５０を小径筒部１４の外周面に固定できるようになっている。これにより、中間筒部５０、小径筒部１４、可撓性連結部４２で囲まれた遮音用密閉空間５４が形成されるようになっている。   As shown in FIG. 3, in the flexible connecting portion 42, the connecting position on the inner peripheral surface of the enlarged diameter cylindrical portion 22 is shifted to the large diameter cylindrical portion 20 side from the small diameter cylindrical portion side end portion 40. Configured in position. In addition, the intermediate region 48 that extends between the enlarged-diameter cylindrical portion-side coupling portion 42a and the small-diameter cylindrical portion-side coupling portion 42b constituting the flexible coupling portion 42 is bent in a convex shape toward the large-diameter cylindrical portion 20 side. Is formed. Furthermore, the diameter-expanded tube portion side connecting portion 42a of the flexible connecting portion 42 extends substantially parallel to the small diameter tube portion-side connecting portion 42b of the flexible connecting portion 42, and the other side in the axial direction (FIG. 3). An intermediate cylinder portion 50 is formed in a substantially cylindrical shape that is concentric and large in diameter toward the middle (upper side) and extends to a position that does not reach the tape fixing portion 24 of the small diameter cylinder portion 14. A tape fixing part 52 is formed at the extended end of the intermediate cylinder part 50. As shown in FIG. 1, the tape fixing portion 52 has a shape in which a peripheral wall at a position facing the radial direction at the opening end portion is cut out into a substantially rectangular shape. As a result, the tape fixing part 52 can be elastically deformed inward in the radial direction, so that the tape fixing part 52 is reduced in diameter by winding a binding tape (not shown) around the outer periphery of the tape fixing part 52. The intermediate cylinder part 50 can be fixed to the outer peripheral surface of the small diameter cylinder part 14. As a result, a sound insulation sealed space 54 surrounded by the intermediate cylinder part 50, the small diameter cylinder part 14, and the flexible connecting part 42 is formed.

このような構造とされたグロメット１０によれば、環状凹溝２６の底面２８に突設されたシールリブ３０が、環状凹溝２６の小径筒部側周壁部３２の環状凹溝２６内方への変形領域３４を外れた位置に突設されている。これにより、グロメット１０を車体パネル１６に装着する際に、環状凹溝２６の小径筒部側周壁部３２が貫通孔１８を通過するために環状凹溝２６の内方に倒れ変形した場合に、シールリブ３０に当接して小径筒部側周壁部３２の変形が制限乃至は阻止されることが未然に防止されるようになっている。それゆえ、グロメット１０を車体パネル１６に装着する際に小径筒部側周壁部３２の変形がスムーズに許容されて、グロメット１０の挿入力の低減が可能となっている。しかも、シールリブ３０が、環状凹溝２６の底面２８において小径筒部側周壁部３２の環状凹溝２６内方への変形領域３４を外れた位置に突設されていることから、シールリブ３０が車体パネル１６の貫通孔１８の周縁部に対して確実に当接されて、シールリブ３０によるグロメット１０の防水性の確保が担保されている。   According to the grommet 10 having such a structure, the seal rib 30 projecting from the bottom surface 28 of the annular groove 26 is formed inward of the annular groove 26 on the small-diameter cylindrical portion side peripheral wall portion 32 of the annular groove 26. It protrudes at a position outside the deformation region 34. Thereby, when the grommet 10 is mounted on the vehicle body panel 16, when the small-diameter cylindrical portion side peripheral wall portion 32 of the annular groove 26 falls and deforms inwardly of the annular groove 26 in order to pass through the through hole 18, The deformation of the small-diameter cylindrical portion side peripheral wall portion 32 in contact with the seal rib 30 is prevented from being restricted or prevented. Therefore, when the grommet 10 is attached to the vehicle body panel 16, the deformation of the small-diameter cylindrical portion side peripheral wall portion 32 is allowed smoothly, and the insertion force of the grommet 10 can be reduced. In addition, since the seal rib 30 protrudes from the bottom surface 28 of the annular groove 26 at a position outside the deformation region 34 inward of the annular groove 26 inside the small-diameter cylindrical portion side peripheral wall portion 32, the seal rib 30 is provided on the vehicle body. The panel 16 is reliably brought into contact with the peripheral edge portion of the through hole 18 to ensure the waterproofness of the grommet 10 by the seal rib 30.

以上、本発明の実施形態について詳述したが、本発明はこれらの具体的な記載によって限定されない。例えば、図４に示されている別の態様のグロメット５６のように、さらに環状凹溝２６の大径筒部側周壁部５８にサブシールリブ６０が突設されていてもよい。これにより大径筒部側周壁部５８が変形することが有利に制限されることから、シールリブ３０が大径筒部側周壁部５８に比較的近い部位に設けられていることによって、環状凹溝２６の底面２８が貫通孔１８の周縁部に押圧された際に貫通孔１８の周縁部に対して斜交するように変形するおそれが低減されている。それゆえ、グロメット５６を一層安定して車体パネル１６の貫通孔１８に装着することができるようになっている。しかも、サブシールリブ６０を新たに設けたことにより、シールリブ３０と併せてグロメット５６の防水性の一層の確保が担保されている。なお、本実施形態においても、シールリブ３０は上記実施形態と同じ位置に突設されていることから、上記実施形態と同様に、グロメット５６を車体パネル１６に装着する際に小径筒部側周壁部３２の変形がスムーズに許容されて、グロメット５６の挿入力の低減が可能となっている。   As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by these specific description. For example, like the grommet 56 of another aspect shown by FIG. 4, the sub seal rib 60 may be further protrudingly provided by the large diameter cylinder side peripheral wall part 58 of the annular groove 26. FIG. As a result, the deformation of the large-diameter cylindrical portion side peripheral wall portion 58 is advantageously limited, so that the seal rib 30 is provided in a portion relatively close to the large-diameter cylindrical portion-side peripheral wall portion 58, thereby When the bottom surface 28 of 26 is pressed against the peripheral portion of the through hole 18, the possibility of deformation so as to obliquely intersect the peripheral portion of the through hole 18 is reduced. Therefore, the grommet 56 can be more stably attached to the through hole 18 of the vehicle body panel 16. In addition, since the sub seal rib 60 is newly provided, the waterproofness of the grommet 56 is further ensured together with the seal rib 30. Also in this embodiment, the seal rib 30 protrudes at the same position as in the above embodiment. Therefore, when the grommet 56 is attached to the vehicle body panel 16 as in the above embodiment, the small diameter cylindrical portion side peripheral wall portion is provided. The deformation of 32 is allowed smoothly, and the insertion force of the grommet 56 can be reduced.

１０，５６：グロメット、１２：ワイヤハーネス、１４：小径筒部、１６：車体パネル（固定部材）、１８：貫通孔、２０：大径筒部、２２：拡径筒部、２６：環状凹溝、２８：底面、３０：シールリブ、３２：小径筒部側周壁部、３４：変形領域、５８：大径筒部側周壁部、６０：サブシールリブ 10, 56: Grommet, 12: Wire harness, 14: Small-diameter cylindrical portion, 16: Body panel (fixing member), 18: Through hole, 20: Large-diameter cylindrical portion, 22: Large-diameter cylindrical portion, 26: Annular groove , 28: bottom surface, 30: seal rib, 32: small-diameter cylindrical part side peripheral wall part, 34: deformation region, 58: large-diameter cylindrical part side peripheral wall part, 60: sub seal rib

Claims (2)

ワイヤハーネスの外周面に固定される小径筒部と、固定部材の貫通孔に固定される大径筒部と、前記小径筒部と前記大径筒部の間を連結する拡径筒部とを備え、
前記大径筒部の外周面に開口して前記貫通孔の周縁部が外嵌固定される環状凹溝の底面に、シールリブが突設されてなるグロメットにおいて、
前記シールリブが、前記環状凹溝の前記底面において、前記環状凹溝の小径筒部側周壁部の前記環状凹溝内方への変形領域を外れた位置に突設されている
ことを特徴とするグロメット。 A small-diameter cylindrical portion fixed to the outer peripheral surface of the wire harness, a large-diameter cylindrical portion fixed to the through hole of the fixing member, and an enlarged-diameter cylindrical portion connecting the small-diameter cylindrical portion and the large-diameter cylindrical portion. Prepared,
In the grommet formed by projecting a seal rib on the bottom surface of the annular groove that opens to the outer peripheral surface of the large-diameter cylindrical portion and the outer peripheral portion of the through-hole is fitted and fixed,
The seal rib protrudes from the bottom surface of the annular groove at a position outside a deformation region inward of the annular groove in the small-diameter cylindrical portion side peripheral wall portion of the annular groove. Grommet. 前記環状凹溝の大径筒部側周壁部にサブシールリブが突設されている請求項１に記載のグロメット。   The grommet according to claim 1, wherein a sub seal rib protrudes from the peripheral wall portion on the side of the large-diameter cylindrical portion of the annular groove.
JP2016057811A 2016-03-23 2016-03-23 Grommet Pending JP2017175742A (en)

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