JP3755795B2

JP3755795B2 - Soundproof grommet

Info

Publication number: JP3755795B2
Application number: JP21662499A
Authority: JP
Inventors: 一郎安江; 文裕柴原
Original assignee: Toyota Industries Corp; Yazaki Corp
Current assignee: Toyota Industries Corp; Yazaki Corp
Priority date: 1999-07-30
Filing date: 1999-07-30
Publication date: 2006-03-15
Anticipated expiration: 2019-07-30
Also published as: JP2001041358A

Description

【０００１】
【発明の属する技術分野】
本発明は、ワイヤハーネスを車両等のパネルの孔部に貫通させた部分における防水と防音を図った防音式グロメットに関するものである。
【０００２】
【従来の技術】
図４は従来の防音式グロメットを示すものである。
この防音式グロメット４１は合成ゴムで形成され、大径なカップ部４２と、カップ部４２を貫通した小径な筒状部４３と、筒状部４３から延長された略カップ状の防音膜４４とで構成されている。
【０００３】
カップ部４２は外周側に、車両のパネル（図示せず）に対する嵌着溝４５と鍔状のシールリップ部４６とを有し、内周側に、防音膜４４に対する滑り止め用の突条４７を有している。筒状部４３にはワイヤハーネス（図示せず）が挿通され、ビニルテープ（図示せず）で巻回固定される。筒状部４３やカップ部４２の内側にウレタン等の防水材を注入する場合もある。防音膜４４は末広がりの傾斜部４８と傾斜部４８に続く円筒部４９とで構成されている。
【０００４】
図５に示す如く、防音膜４４を外向きに反転させてカップ部４２の内側に嵌め入れる。防音膜４４はカップ部４２の内周面に弾性的に密着し、カップ部４２内に環状の中空層５０が画成される。防音膜４４でカップ部４２の開口５２を塞ぐことで、車両側の音が車室内に侵入すること等が防止される。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記従来の構造にあっては、図５の如く防音膜４４を反転させてカップ部４２内に嵌め入れた際に、防音膜４４の屈曲部５１がカップ部４２の端面（開口５２）から少し突出するため、輸送中や組付時等において屈曲部５１が何かに引っ掛かって、図６に示す如く、防音膜４４が引き出されかねないという懸念があった。この状態では防音膜４４がカップ部４２から外れてしまい、防音効果を得ることができなくなってしまう。これは、防音膜４４が車両走行時の振動等によって抜け出した場合においても同様である。
【０００６】
本発明は、上記した点に鑑み、防音膜の屈曲部が外部の何物かに引っ掛かったりした場合でも、防音膜がカップ部から抜け出すことがなく、常に確実な防音効果を発揮することのできる防音式グロメットを提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記目的を達成するために、本発明は、ワイヤハーネスを挿通する筒状部と、該筒状部の外側に続く大径のカップ部と、カップ部の内側で該筒状部に続いて延長形成された防音膜とを備え、該防音膜が中間の屈曲部から外向きに反転した反転部を有し、該反転部が該カップ部の内周面側に弾性的に接触し、該反転部が該防音膜の他の部位よりも厚肉に形成された防音式グロメットを採用する（請求項１）。
前記反転部の板厚が、該反転部の先端に向かうにつれてテーパ状に増加していることも有効である（請求項２）。また、前記反転部が、該反転部の基部側の屈曲部を除いて厚肉に形成されたことも有効である（請求項３）。また、前記カップ部の内側に前記筒状部が延長され、該筒状部から外向きに傾斜部が延設され、該傾斜部に前記屈曲部が続き、該屈曲部に前記反転部が続いたことも有効である（請求項４）。
また、ワイヤハーネスを挿通する筒状部と、該筒状部の外側に続く大径のカップ部と、該カップ部の内側で該筒状部に続いて延長形成された防音膜とを備え、該防音膜が中間の屈曲部から外向きに反転した反転部を有し、該反転部が該カップ部の内周面側に弾性的に接触し、該カップ部に、該屈曲部を覆う保護壁が延設された防音式グロメットを併せて採用する（請求項５）。
前記保護壁が前記屈曲部よりも長く突出したことも有効である（請求項６）。
【０００８】
【発明の実施の形態】
以下に本発明の実施の形態の具体例を図面を用いて詳細に説明する。
図１〜図２は、本発明に係る防音式グロメットの一実施形態を示すものである。
【０００９】
この防音式グロメット１は防音膜２の反転部３側をテーパ状に漸次厚肉に形成したことを特徴とするものである。反転部３は先端に向かうにつれて漸次厚肉になっている。
【００１０】
図１の如く、防音式グロメット１は従来同様に合成ゴムを材料として、カップ部４と筒状部５と、筒状部５から延長形成された防音膜２とで構成されている。カップ部４は外側の周壁６と前側の封止壁７と後側の開口８とを有し、周壁６に、パネル（図示せず）に対する嵌着溝９と鍔状のシールリップ部１０とを有している。本実施形態ではシールリップ部１０の位置はパネル側の形状に合わせて嵌着溝９よりやや離間している。開口８の内側すなわち周壁６と筒状部５との間に、防音膜２を嵌め入れる環状の空間１１が構成されている。
【００１１】
筒状部５は、封止壁７から前方に突出した小径部５ａと、カップ部４の内側に同心に位置する中径部５ｂとで構成されている。小径部５ａにはワイヤハーネス（図示せず）が挿通密着し、且つビニルテープ（図示せず）で巻回固定される。中径部５ｂはその一部がやや厚肉に形成されて、ある程度の剛性を有している。中径部５ｂやカップ部４の封止壁７側にはウレタン等の防水材を注入可能である。
【００１２】
中径部５ｂはカップ部４内で開口８の近くまで延び、中径部５ｂの後端から開口８にかけてテーパ状の第一傾斜部（傾斜部）１２が末広がりに続き、第一傾斜部１２の後端からシールリップ部１０の後端にかけて真直部１３が環状に続き、真直部１３の後端から第一傾斜部１２よりも長いテーパ状の第二傾斜部１４が末広がりに続き、第二傾斜部１４の後端から前記反転部３の主体をなすテーパ状の厚肉部分１５が続いている。
【００１３】
テーパ状の厚肉部分１５の外周面１５ａはグロメット軸方向にほぼ平行に位置し、厚肉部分１５の内周面１５ｂがテーパ状に漸次内向きに傾斜している。厚肉部分１５の内径は先端２ａに向かうにつれて小径になっている。厚肉部分１５の外径は長手方向にかけてほぼ一定である。厚肉部分１５の先端内側には短い鍔状の突条１６が円周上に形成されている。厚肉部分１５と第二傾斜部１４との境界は円弧面１７で続いている。第一傾斜部１２と真直部１３と第二傾斜部１４と厚肉部分１５とで防音膜２が構成されている。
【００１４】
図２の如く、防音膜２を外向きに反転させて（捲って）、カップ部４内に嵌め入れる。図１の成形状態における防音膜２の厚肉部分１５の外周面１５ｂは図２の反転状態で内周面となり、内周面１５ｂは外周面となる。図１の真直部１３と第二傾斜部１４とで屈曲部１８が構成される。厚肉部分１５の外周面１５ａは防音膜２の復元力によってカップ部４の内周側に弾性的に接触する。そして厚肉部分１５の剛性が防音膜２の他の部分よりも高いから、防音膜２が屈曲しにくく、それによって、例え屈曲部１８が引っ掛けられても、厚肉部分１５がカップ部４から脱出することがない。
【００１５】
図２において厚肉部分１５の外周面１５ｂはカップ部４の内周面６ａの前後二箇所の滑り防止用の突条１９に線接触し、且つ厚肉部分の先端の突条１６が封止壁７寄りでカップ部４の内周面６ａに線接触する。これによってもカップ部４内での厚肉部分１５の引っ掛かり力が増し、抜け出しが防止される。
【００１６】
厚肉部分１５は各突条１６，１９によって僅かに略くの字状に撓んだ状態で保持される。これにより、厚肉部分１５がカップ部４の内周面６ａに干渉して離脱しにくくなる。厚肉部分１５の外周面１５ｂがカップ部４の内周面６ａに沿ってほぼ真直に位置し、厚肉部分１５の内周面１５ａがテーパ状に内向きに傾斜して位置する。厚肉部分１５の剛性は屈曲部１８側から先端２ａ側に向かうにつれて漸次大きくなっている。且つカップ部４の内周面６ａに対する厚肉部分１５の接触圧力が、屈曲部１８側から先端２ａ側に向かうにつれて漸次大きくなっている。これらにより、防音膜２の抜け出しが効率的に抑止される。厚肉部分１５をテーパ状にすることで、防音膜２の重量の軽減や成形時の型抜きの容易化及びカップ部４内への挿入性の向上も図られている。
【００１７】
図１における真直部１３と第二傾斜部１４とで図２における屈曲部１８が構成されているが、第一傾斜部１２が外向きに張り出していることで、屈曲部１８の曲率半径が小さく抑えられ、第一傾斜部１２とカップ部４の内周面６ａとの間の隙間が狭くなり、それによっても反転部３すなわち厚肉部分１５が抜け出しにくくなっている。また、第一傾斜部１２は屈曲部１８を介して反転部３をカップ部４の内周面６ａに押し付ける力を与え、それによって反転部３がカップ部４の内周面６ａに強く密着し、抜け出しにくくなっている。屈曲部１８の肉厚は厚肉部分１５に較べて薄いから、屈曲性に優れ、カップ部４内への厚肉部分１５の挿入が容易である。
【００１８】
一例として、防音膜２のテーパ角度は約６°、厚肉部分１５の最大肉厚Ｔ₁（図１）は４．０mm、厚肉部分１５の開始点の肉厚Ｔ₂（図１）は２．０mm程度である。折り返された防音膜２とカップ部４の封止壁７との間に環状の中空層１１ａが構成される。
【００１９】
厚肉部分１５をテーパ状ではなく真直に形成した場合でも、剛性が高まるから、カップ部４からの防音膜２の抜け出しが防止されるが、この場合は上記の如く厚肉部分１５をテーパ状に形成したことによる作用効果は得られない。
【００２０】
本実施形態では屈曲部１８はシールリップ部１０の後端１０ａから若干後方に突出しているが、外部との干渉を防止するという観点からは、屈曲部１８がシールリップ部１０の後端１０ａよりも内側に引っ込んでいることが好ましい。
【００２１】
図３は、本発明に係る防音式グロメットの他の実施形態を示すものである。
この防音式グロメット２１は、防音膜２２の屈曲部２３よりもグロメット軸方向にカップ部２４の保護壁２５を長く延設して、保護壁２５の内側に屈曲部２３を収容したことを特徴とするものである。
【００２２】
防音膜２２をカップ部２４内に反転させた状態で、屈曲部２３が保護壁２５の内側に隠されるから、屈曲部２３が外部の何物かと干渉したり引っ掛かったりすることがなく、それにより、防音膜２２の傷みや抜け出しが確実に防止される。
【００２３】
本実施形態における防音膜２２は板厚の薄い均一なものである。前記実施形態における厚肉部分１５（図２）を有する防音膜２に本実施形態の保護壁２５を使用することも可能である。その場合には、カップ部２４からの反転部２８の抜け出しが一層確実に防止される。本実施形態は防音膜２２の形状と保護壁２５の構成以外の部分は前記実施形態と基本的にほぼ同じである。
【００２４】
保護壁２５はカップ部２４の開口２６側においてカップ部２４の周壁２７よりも薄肉に且つ短い円筒状（環状）に形成され、保護壁２５の内周面２５ａはカップ部２４の内周面２７ａと同一面に続いている。保護壁２５の先端２５ｂは防音膜２２の屈曲部２３よりも突出して、屈曲部２３の外側を露出しないように覆っている。
【００２５】
保護壁２５の先端２５ｂは少なくとも屈曲部２３と同一平面上に位置することが必要である。屈曲部２３に対する保護壁２５の突出長さＬは例えば０〜５mm程度である。保護壁２５の内周面２５ａは防音膜２２の屈曲部２３及び反転部２８の外周面２８ｂに近接している。保護壁２５の先端２５ｂはシールリップ部２９の後端２９ａよりも後方に突出している（後方とは筒状部３０の小径部３１を前方とした場合の向きである）。シールリップ部２９の後端２９ａがカップ部２４の開口２６と一致している。
【００２６】
保護壁２５の板厚は、屈曲部２３を含む防音膜２２の板厚よりもやや厚く設定されている。保護壁２５はカップ部２４と一体の弾性部材であるから強く押せば撓み可能であるが、屈曲部２３を十分に保護し得る剛性を有している。
【００２７】
防音膜２２はややテーパ状に拡がった長めの傾斜部３２と、傾斜部３２に続く屈曲部２３と、屈曲部２３に続く反転部２８とで構成されている。傾斜部３２は前記実施形態における真直な筒状部５（図１）に対応する部分である。傾斜部３２の基部はカップ部２４の封止壁３３において筒状部３０に続き、筒状部３０はカップ部２４の外側に突出した小径部３１に続いている。傾斜部３２がカップ部２４の周壁２７側に張り出していることで、屈曲部２３の半径は従来に較べて小さくなっており、これによっても反転部２８の抜け出しが抑止されている。
【００２８】
防音膜２２とカップ部２４との間に中空部３４が構成されている。反転部２８はカップ部２４に周方向の各突条３５，３６で弾性的に接触している。３７は、パネル（図示せず）に対する嵌着溝である。
【００２９】
なお、本実施形態における防音膜２２はカップ部２４内に位置する傾斜部３２と、傾斜部３２に続く屈曲部２３と、屈曲部２３に続く反転部２８とで構成されているが、カップ部２４内に従来例（図４）のような筒状部や前記実施形態のような筒状部５（図１）が形成され、筒状部５に防音膜が延設されている防音式グロメットにおいても、本実施形態の保護壁２５を適用可能である。また、本実施形態の傾斜部３２を傾斜状の筒状部と見做してもよい。
【００３０】
【発明の効果】
以上の如く、請求項１記載の発明によれば、防音膜の厚肉の反転部の剛性が防音膜の他の部分よりも高いから、反転部がカップ部内で屈曲しにくく、それにより、屈曲部が引っ掛かった場合や車両走行時の振動等によっても、反転部が常にほぼ真直な状態に保持され、反転部がカップ部の内周面に引っ掛かって、カップ部からの反転部の抜け出しが確実に防止される。
【００３１】
また、請求項２記載の発明によれば、反転部の先端に行くほどに板厚が直線的に増加して撓みにくくなるから、反転部が長いものであっても、効率的にカップ部からの抜け出しが抑止される。また、反転部の屈曲部側はある程度容易に撓ませ可能であるから、カップ部内への防音膜の挿入性が良く、挿入作業が容易である。また、反転部のゴム成形時における型抜き性が良く、生産性が向上する。
【００３２】
また、請求項３記載の発明によれば、厚肉の反転部に対して、屈曲部が薄肉で撓みやすいから、防音膜の反転作業すなわちカップ部内への反転部の挿入作業が容易である。また、薄肉の屈曲部が車両走行時の反転部の振動を吸収して、反転部のずれ落ちを防止する。これによっても、反転部の抜け出しが防止される。
【００３３】
また、請求項４記載の発明によれば、傾斜部によって屈曲部の半径が小さくなり、傾斜部とカップ部の内周面との隙間が狭くなるから、反転部がカップ部から抜け出しにくくなる。また、屈曲部の半径が小さくなることで、反転部がカップ部の内周面に強く押し付けられるから、反転部がカップ部から抜け出しにくくなる。
【００３４】
また、請求項５記載の発明によれば、防音膜の屈曲部が保護壁で覆われるから、屈曲部が外部と干渉したり引っ掛かったりすることがなく、反転部の傷みや抜け出しが確実に防止される。
【００３５】
また、請求項６記載の発明によれば、防音膜の屈曲部が保護壁から出っ張ることがないから、屈曲部の傷みや反転部の抜け出しが一層確実に防止される。
【図面の簡単な説明】
【図１】本発明に係る防音式グロメットの一実施形態における成形状態を示す縦断面図である。
【図２】同じく防音膜をカップ部内に反転させた状態を示す縦断面図である。
【図３】本発明に係る防音式グロメットの他の実施形態を示す縦断面図である。
【図４】従来の防音式グロメットを示す縦断面図である。
【図５】同じく防音膜をカップ部内に反転させた状態を示す縦断面図である。
【図６】従来の問題点を示す要部断面図である。
【符号の説明】
１，２１防音式グロメット
２，２２防音膜
３，２８反転部
４，２４カップ部
５筒状部
１２第一傾斜部（傾斜部）
１８，２３屈曲部
２５保護壁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a soundproof grommet that is waterproof and soundproofed at a portion where a wire harness is passed through a hole of a panel of a vehicle or the like.
[0002]
[Prior art]
FIG. 4 shows a conventional soundproof grommet.
The soundproof grommet 41 is made of synthetic rubber and has a large-diameter cup portion 42, a small-diameter cylindrical portion 43 that penetrates the cup portion 42, and a substantially cup-shaped soundproof film 44 that extends from the cylindrical portion 43. It consists of
[0003]
The cup portion 42 has a fitting groove 45 for a vehicle panel (not shown) and a bowl-shaped seal lip portion 46 on the outer peripheral side, and an anti-slip ridge 47 for the soundproof film 44 on the inner peripheral side. have. A wire harness (not shown) is inserted through the cylindrical portion 43 and is wound and fixed with a vinyl tape (not shown). A waterproof material such as urethane may be injected inside the cylindrical portion 43 or the cup portion 42. The soundproof film 44 is composed of an inclined portion 48 that spreads toward the end and a cylindrical portion 49 that follows the inclined portion 48.
[0004]
As shown in FIG. 5, the soundproof film 44 is inverted outwardly and fitted inside the cup portion 42. The soundproof film 44 is elastically adhered to the inner peripheral surface of the cup part 42, and an annular hollow layer 50 is defined in the cup part 42. By closing the opening 52 of the cup part 42 with the soundproof film 44, the sound on the vehicle side is prevented from entering the vehicle interior.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional structure, when the soundproof film 44 is inverted and fitted into the cup part 42 as shown in FIG. 5, the bent part 51 of the soundproof film 44 is the end face (opening 52) of the cup part 42. Therefore, there is a concern that the soundproof film 44 may be pulled out as shown in FIG. 6 because the bent portion 51 is caught by something during transportation or assembly. In this state, the soundproof film 44 is detached from the cup portion 42, and the soundproof effect cannot be obtained. The same applies to the case where the soundproof film 44 comes out due to vibration or the like when the vehicle travels.
[0006]
In view of the above points, the present invention can always exhibit a reliable soundproofing effect without the soundproofing film coming out of the cup part even when the bent part of the soundproofing film is caught on something outside. An object is to provide a soundproof grommet.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a cylindrical portion through which a wire harness is inserted, a large-diameter cup portion that extends outside the cylindrical portion, and an extension that follows the cylindrical portion inside the cup portion. A sound-insulating film formed, and the sound-insulating film has an inversion part that is inverted outward from an intermediate bending part, and the inversion part elastically contacts the inner peripheral surface side of the cup part, and the inversion A soundproof grommet having a portion formed thicker than other portions of the soundproofing film is employed (claim 1).
It is also effective that the plate thickness of the inversion part increases in a tapered shape toward the tip of the inversion part (Claim 2). It is also effective that the inversion portion is formed thick except for a bent portion on the base side of the inversion portion. Further, the cylindrical portion is extended to the inside of the cup portion, the inclined portion outwardly from the cylindrical portion is extended, the bent portion is followed by the inclined portion, the inverted portion is followed by the bent portion This is also effective (claim 4).
In addition, a cylindrical portion that passes through the wire harness, a large-diameter cup portion that continues to the outside of the cylindrical portion, and a soundproof film that is formed to extend from the cylindrical portion to the inside of the cup portion, The soundproof film has a reversing portion that is reversed outward from an intermediate bent portion, the reversing portion elastically contacts the inner peripheral surface side of the cup portion , and the cup portion covers the bent portion. A soundproof grommet with extended walls is also employed (claim 5).
It is also effective that the protective wall protrudes longer than the bent portion (claim 6).
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Specific examples of embodiments of the present invention will be described below in detail with reference to the drawings.
1 to 2 show an embodiment of a soundproof grommet according to the present invention.
[0009]
The soundproof grommet 1 is characterized in that the reversal part 3 side of the soundproof film 2 is formed in a tapered shape and gradually thickened. The reversing part 3 becomes gradually thicker toward the tip.
[0010]
As shown in FIG. 1, the soundproof grommet 1 is composed of a cup portion 4, a cylindrical portion 5, and a soundproof film 2 extended from the cylindrical portion 5, using a synthetic rubber as a conventional material. The cup portion 4 has an outer peripheral wall 6, a front sealing wall 7 and a rear opening 8. The peripheral wall 6 has a fitting groove 9 for a panel (not shown), a bowl-shaped seal lip portion 10, and the like. have. In this embodiment, the position of the seal lip portion 10 is slightly separated from the fitting groove 9 in accordance with the shape of the panel side. An annular space 11 into which the soundproof film 2 is fitted is formed inside the opening 8, that is, between the peripheral wall 6 and the cylindrical portion 5.
[0011]
The cylindrical part 5 is composed of a small diameter part 5 a protruding forward from the sealing wall 7 and a medium diameter part 5 b located concentrically inside the cup part 4. A wire harness (not shown) is inserted into close contact with the small diameter portion 5a, and is wound and fixed with a vinyl tape (not shown). A part of the middle diameter part 5b is formed to be slightly thick and has a certain degree of rigidity. A waterproof material such as urethane can be injected on the side of the sealing wall 7 of the middle diameter portion 5b or the cup portion 4.
[0012]
The middle diameter portion 5b extends to the vicinity of the opening 8 in the cup portion 4, a tapered first inclined portion (inclined portion) 12 continues from the rear end of the middle diameter portion 5b to the opening 8, and the first inclined portion 12 extends. The straight portion 13 continues in an annular shape from the rear end to the rear end of the seal lip portion 10, and the tapered second inclined portion 14 longer than the first inclined portion 12 continues from the rear end of the straight portion 13 to the end, A tapered thick portion 15 that forms the main body of the reversing portion 3 continues from the rear end of the inclined portion 14.
[0013]
The outer peripheral surface 15a of the tapered thick portion 15 is positioned substantially parallel to the grommet axis direction, and the inner peripheral surface 15b of the thick portion 15 is gradually inclined inward in a tapered shape. The inner diameter of the thick portion 15 becomes smaller as it goes toward the tip 2a. The outer diameter of the thick portion 15 is substantially constant over the longitudinal direction. A short hook-shaped ridge 16 is formed on the circumference inside the tip of the thick portion 15. The boundary between the thick portion 15 and the second inclined portion 14 continues at the circular arc surface 17. The soundproof film 2 is configured by the first inclined portion 12, the straight portion 13, the second inclined portion 14, and the thick portion 15.
[0014]
As shown in FIG. 2, the soundproof film 2 is inverted (turned) outward and fitted into the cup portion 4. The outer peripheral surface 15 b of the thick portion 15 of the soundproofing layer 2 in the molding state of FIG. 1 becomes the inner peripheral surface in an inverted state of FIG. 2, the inner circumferential surface 15b becomes the outer peripheral surface. The straight portion 13 and the second inclined portion 14 in FIG. The outer peripheral surface 15 a of the thick portion 15 is elastically in contact with the inner peripheral side of the cup portion 4 by the restoring force of the soundproof film 2. And since the rigidity of the thick part 15 is higher than the other part of the soundproof film 2, the soundproof film 2 is hard to be bent, so that even if the bent part 18 is hooked, the thick part 15 is separated from the cup part 4. There is no escape.
[0015]
In FIG. 2, the outer peripheral surface 15b of the thick portion 15 is in line contact with the anti-slip ridges 19 at the two front and rear portions of the inner peripheral surface 6a of the cup portion 4, and the ridge 16 at the tip of the thick portion is sealed. Near the wall 7, line contact is made with the inner peripheral surface 6 a of the cup portion 4. This also increases the catching force of the thick portion 15 in the cup portion 4 and prevents it from coming out.
[0016]
The thick portion 15 is held by the protrusions 16 and 19 in a state of being slightly bent in a substantially U shape. Thereby, the thick wall portion 15 interferes with the inner peripheral surface 6a of the cup portion 4 and is not easily detached. The outer peripheral surface 15b of the thick portion 15 is positioned substantially straight along the inner peripheral surface 6a of the cup portion 4, and the inner peripheral surface 15a of the thick portion 15 is positioned so as to be inclined inwardly in a tapered shape. The rigidity of the thick portion 15 gradually increases from the bent portion 18 side toward the tip 2a side. In addition, the contact pressure of the thick portion 15 with respect to the inner peripheral surface 6a of the cup portion 4 gradually increases from the bent portion 18 side toward the tip 2a side. As a result, the escape of the soundproof film 2 is efficiently suppressed. By making the thick portion 15 into a tapered shape, the weight of the soundproof film 2 is reduced, the die is easily removed during molding, and the insertion property into the cup portion 4 is improved.
[0017]
The straight portion 13 and the second inclined portion 14 in FIG. 1 constitute the bent portion 18 in FIG. 2, but the first inclined portion 12 projects outward, so that the radius of curvature of the bent portion 18 is small. Thus, the gap between the first inclined portion 12 and the inner peripheral surface 6a of the cup portion 4 is narrowed, and the reversing portion 3, that is, the thick portion 15 is not easily pulled out. Further, the first inclined portion 12 gives a force for pressing the reversing portion 3 against the inner peripheral surface 6 a of the cup portion 4 through the bent portion 18, so that the reversing portion 3 strongly adheres to the inner peripheral surface 6 a of the cup portion 4. It ’s hard to get out. Since the thickness of the bent portion 18 is thinner than that of the thick portion 15, the bent portion 18 is excellent in flexibility, and the thick portion 15 can be easily inserted into the cup portion 4.
[0018]
As an example, the taper angle of the soundproof film 2 is about 6 °, the maximum thickness T ₁ (FIG. 1) of the thick portion 15 is 4.0 mm, and the thickness T ₂ (FIG. 1) at the starting point of the thick portion 15 is It is about 2.0 mm. An annular hollow layer 11 a is formed between the folded soundproof film 2 and the sealing wall 7 of the cup portion 4.
[0019]
Even when the thick portion 15 is formed straight rather than in a tapered shape, the rigidity is increased, so that the soundproof film 2 is prevented from slipping out of the cup portion 4. In this case, the thick portion 15 is tapered as described above. The effect by having formed in this is not obtained.
[0020]
In the present embodiment, the bent portion 18 protrudes slightly rearward from the rear end 10a of the seal lip portion 10, but the bent portion 18 is more than the rear end 10a of the seal lip portion 10 from the viewpoint of preventing interference with the outside. Is also preferably retracted inward.
[0021]
FIG. 3 shows another embodiment of the soundproof grommet according to the present invention.
The soundproof grommet 21 is characterized in that the protective wall 25 of the cup portion 24 extends longer in the grommet axial direction than the bent portion 23 of the soundproof film 22, and the bent portion 23 is accommodated inside the protective wall 25. To do.
[0022]
Since the bent portion 23 is hidden inside the protective wall 25 in a state where the soundproof film 22 is inverted in the cup portion 24, the bent portion 23 does not interfere with or get caught by something outside, thereby Further, the soundproof film 22 is prevented from being damaged or pulled out.
[0023]
The soundproof film 22 in this embodiment is a uniform thin film. It is also possible to use the protective wall 25 of this embodiment for the soundproof film 2 having the thick portion 15 (FIG. 2) in the above embodiment. In that case, the reversal part 28 is prevented from coming out of the cup part 24 more reliably. This embodiment is basically the same as the above embodiment except for the shape of the soundproof film 22 and the configuration of the protective wall 25.
[0024]
The protective wall 25 is formed in a cylindrical shape (annular) that is thinner and shorter than the peripheral wall 27 of the cup portion 24 on the opening 26 side of the cup portion 24, and the inner peripheral surface 25 a of the protective wall 25 is the inner peripheral surface 27 a of the cup portion 24. And continues on the same side. The tip 25b of the protective wall 25 protrudes from the bent portion 23 of the soundproof film 22, and covers the outside of the bent portion 23 so as not to be exposed.
[0025]
The tip 25b of the protective wall 25 needs to be positioned on the same plane as at least the bent portion 23. The protruding length L of the protective wall 25 with respect to the bent portion 23 is, for example, about 0 to 5 mm. The inner peripheral surface 25 a of the protective wall 25 is close to the bent portion 23 of the soundproof film 22 and the outer peripheral surface 28 b of the reversing portion 28. The front end 25b of the protective wall 25 protrudes rearward from the rear end 29a of the seal lip portion 29 (the rear is the direction when the small-diameter portion 31 of the cylindrical portion 30 is the front). The rear end 29 a of the seal lip portion 29 coincides with the opening 26 of the cup portion 24.
[0026]
The plate thickness of the protective wall 25 is set to be slightly thicker than the plate thickness of the soundproof film 22 including the bent portion 23. Since the protective wall 25 is an elastic member integrated with the cup portion 24, it can be bent when pressed strongly, but has sufficient rigidity to sufficiently protect the bent portion 23.
[0027]
The soundproof film 22 includes a long inclined portion 32 that is slightly tapered, a bent portion 23 that follows the inclined portion 32, and an inversion portion 28 that follows the bent portion 23. The inclined part 32 is a part corresponding to the straight cylindrical part 5 (FIG. 1) in the embodiment. The base portion of the inclined portion 32 continues to the cylindrical portion 30 in the sealing wall 33 of the cup portion 24, and the cylindrical portion 30 continues to the small diameter portion 31 that protrudes outside the cup portion 24. Since the inclined portion 32 protrudes toward the peripheral wall 27 side of the cup portion 24, the radius of the bent portion 23 is smaller than that of the conventional one, and this also prevents the reversing portion 28 from slipping out.
[0028]
A hollow portion 34 is formed between the soundproof film 22 and the cup portion 24. The reversing part 28 is in elastic contact with the cup part 24 by means of the circumferential protrusions 35 and 36. Reference numeral 37 denotes a fitting groove for a panel (not shown).
[0029]
In addition, although the soundproof film 22 in this embodiment is comprised by the inclination part 32 located in the cup part 24, the bending part 23 following the inclination part 32, and the inversion part 28 following the bending part 23, it is a cup part. A soundproof grommet in which a tubular portion as in the conventional example (FIG. 4) and a tubular portion 5 (FIG. 1) as in the above-described embodiment are formed in 24, and a soundproof film is extended to the tubular portion 5. In this case, the protective wall 25 of this embodiment can be applied. Further, the inclined portion 32 of the present embodiment may be regarded as an inclined cylindrical portion.
[0030]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the rigidity of the thick inverted portion of the soundproof film is higher than that of the other portions of the soundproof film, the inverted portion is less likely to bend in the cup portion. The reversing part is always kept almost straight even when the part is caught or when the vehicle is running, etc., and the reversing part is caught on the inner peripheral surface of the cup part, so that the reversing part can be pulled out from the cup part without fail. To be prevented.
[0031]
In addition, according to the invention described in claim 2, since the plate thickness increases linearly as it goes to the tip of the reversing portion and becomes difficult to bend, even if the reversing portion is long, it is efficiently removed from the cup portion. Exit is suppressed. Further, since the bent portion side of the reversing portion can be bent easily to some extent, the soundproof film can be easily inserted into the cup portion, and the insertion work is easy. In addition, the reversing part has good mold release properties at the time of rubber molding, and the productivity is improved.
[0032]
According to the third aspect of the present invention, since the bent portion is thin and easy to bend with respect to the thick inverted portion, it is easy to invert the soundproof film, that is, insert the inverted portion into the cup portion. In addition, the thin bent portion absorbs the vibration of the reversing portion when the vehicle is running, and prevents the reversing portion from slipping off. This also prevents the inversion part from slipping out.
[0033]
According to the fourth aspect of the invention, the radius of the bent portion is reduced by the inclined portion, and the gap between the inclined portion and the inner peripheral surface of the cup portion is narrowed, so that the inversion portion is difficult to come out of the cup portion. Moreover, since the reversal part is strongly pressed against the inner peripheral surface of the cup part by reducing the radius of the bent part, the reversal part is difficult to come out of the cup part.
[0034]
According to the invention described in claim 5, since the bent portion of the soundproof film is covered with the protective wall, the bent portion does not interfere with or be caught by the outside, and the reverse portion is reliably prevented from being damaged or pulled out. Is done.
[0035]
According to the sixth aspect of the invention, since the bent portion of the soundproof film does not protrude from the protective wall, the bent portion is prevented from being damaged or the inverted portion is prevented from coming out .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a molded state in an embodiment of a soundproof grommet according to the present invention.
FIG. 2 is a longitudinal sectional view showing a state where the soundproof film is inverted in the cup portion.
FIG. 3 is a longitudinal sectional view showing another embodiment of the soundproof grommet according to the present invention.
FIG. 4 is a longitudinal sectional view showing a conventional soundproof grommet.
FIG. 5 is a longitudinal sectional view showing a state where the soundproof film is inverted in the cup portion.
FIG. 6 is a cross-sectional view of a main part showing a conventional problem.
[Explanation of symbols]
1,21 Soundproofing grommets 2,22 Soundproofing films 3,28 Inverting parts 4,24 Cup part 5 Cylindrical part 12 First inclined part (inclined part)
18, 23 Bent part 25 Protective wall

Claims

A cylindrical portion through which the wire harness is inserted; a large-diameter cup portion that continues to the outside of the cylindrical portion; and a soundproof membrane that is formed to extend from the cylindrical portion to the inside of the cup portion. Has a reversing portion that is reversed outward from the middle bent portion, the reversing portion elastically contacts the inner peripheral surface side of the cup portion, and the reversing portion is thicker than other portions of the soundproofing film. Soundproof grommet characterized by being formed into meat.

The soundproof grommet according to claim 1, wherein the thickness of the reversing portion increases in a tapered shape toward the tip of the reversing portion.

The soundproof grommet according to claim 1 or 2, wherein the inversion part is formed thick except for a bent part on a base side of the inversion part.

The cylindrical portion is extended to the inside of the cup portion, the inclined portion outwardly is extended from the cylindrical portion, the said bent portion to the inclined portion is followed by the the reversing portion is followed by the bent portion The soundproof grommet according to any one of claims 1 to 3.

A cylindrical portion through which the wire harness is inserted, a large-diameter cup portion that continues to the outside of the cylindrical portion, and a soundproof film that extends from the cylindrical portion and extends to the inside of the cup portion. The membrane has a reversing portion that is reversed outward from an intermediate bending portion, the reversing portion elastically contacts the inner peripheral surface side of the cup portion, and a protective wall that covers the bending portion is provided on the cup portion. Soundproof grommet characterized by being extended.

The soundproof grommet according to claim 5, wherein the protective wall protrudes longer than the bent portion.