JP3412983B2 - Grommet - Google Patents
GrommetInfo
- Publication number
- JP3412983B2 JP3412983B2 JP24760895A JP24760895A JP3412983B2 JP 3412983 B2 JP3412983 B2 JP 3412983B2 JP 24760895 A JP24760895 A JP 24760895A JP 24760895 A JP24760895 A JP 24760895A JP 3412983 B2 JP3412983 B2 JP 3412983B2
- Authority
- JP
- Japan
- Prior art keywords
- grommet
- thickness
- cylindrical portion
- side cylindrical
- mounting hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Insulating Bodies (AREA)
- Installation Of Indoor Wiring (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、ワイヤーハーネス
を車体などの取り付け孔に貫通させて配設するために用
いるグロメットに関するものである。
【０００２】
【従来の技術】以下、従来のグロメットを図面を参照し
て説明する。図２は、従来のグロメット３を示す説明図
で、図２（ａ）は正面図、図２（ｂ）は図２（ａ）に示
すＢ−Ｂ部の断面図である。図２（ａ）に示すように従
来のグロメット３は、挿入側筒部２の肉厚が周方向で均
一になっている（さらに詳述すると、挿入側筒部２の上
下にＲ曲線で形成されているＲ曲線部２ａと同じく左右
に直線的に形成されている直線部２ｂの各肉厚は、任意
の箇所の周方向でほぼ同じである）。ただし、図２
（ｂ）に示すように、挿入側筒部２の肉厚は、筒長さ方
向、つまり先端部２ｃから基部２ｄ方向には肉厚が厚く
成っている。
【０００３】
【発明が解決しようとする課題】しかしながら、図２に
示すようにグロメット３は、取り付けパネル４の取り付
け孔１の防水、防音、防塵のため、グロメット３と取り
付け孔１が密着し、かつ、グロメット３に貫通および固
定されたワイヤーハーネス等に加わる予期せぬ外力（車
体へ部品を組み付ける際、作業者がワイヤーハーネスを
引っ張ったり、押し込んだりする力や自動車走行中の振
動によるもの）等で外れないようにグロメット３の外形
（特に取り付け孔１への装着部分）を取り付け孔１より
大きく形成している。よって、取り付け孔１にグロメッ
ト３を装着する際、取り付け孔１の縁は、挿入側筒部２
の先端部２ｃを取り付け孔１に挿入後、取り付け孔１の
径より大きい基部２ｄを越えて溝部に嵌合して、両者が
固定される。この作業は、人手によるものなので、量産
時には作業者にとって重労働となる。この作業軽減を目
的に前記挿入側筒部２全体の肉厚を薄くすれば、弱い人
力でも容易に挿入側筒部２を変形させてグロメット３の
装着作業を行うことが容易に考えられる。しかし、挿入
側筒部２全体の肉厚が薄いと取り付け孔１とグロメット
３の固着力が弱くなり、例えばグロメット３に固定され
たワイヤーハーネスに電装部品等組み付けの際、予期せ
ぬ外力が加わると挿入側筒部２が変形し、グロメット３
が取り付け孔１から外れるという問題が生じる。よっ
て、信頼性優先で考えると挿入側筒部２全体の肉厚は、
人手で容易に変形できない程度の厚さが必要となる。こ
のように従来、組み付け作業性と組み付け後の信頼性の
両方を満足するグロメットが存在しなかった。
【０００４】
【発明の目的】本発明は、かかる点に鑑みてなされたも
のであり、取り付け板への取り付け作業が容易であり、
かつ、取り付け板への十分な固着力を有するグロメット
を提供することを目的としている。
【０００５】
【課題を解決するための手段】請求項１のグロメット
は、取り付け孔に挿入する長円形を成した挿入側筒部を
有するグロメットにおいて、前記挿入側筒部の中心軸に
対して外側に張り出した部分の肉厚が薄く、かつ、前記
外側に張り出した部分以外の部分の肉厚が厚く形成され
ることを特徴とするものである。
【０００６】このように挿入側筒部において、周方向に
肉厚が厚い部分や薄い部分が混在しているので、挿入側
筒部を変形させる際、薄い部分に応力が集中するので弱
い力でも十分変形させることができる。なお、前記厚い
部分により、グロメット装着後の取り付け板への十分な
固着力を確保することができる。
【０００７】
【０００８】取り付け孔に挿入し易いように挿入側筒部
を内側に萎めるように変形させるには、挿入側筒部の中
心軸に対して外側に張り出した部分を局部的に萎めるの
が作業効率上好ましい。例えば長円形を成した挿入側筒
部において、外側に張り出した部分といえば、曲率半径
が比較的小さいＲ曲線部であり、前記外側に張り出した
部分以外の部分といえば、直線あるいは曲率半径が比較
的大きい部分である。前記Ｒ曲線部の肉厚が薄く形成さ
れることにより、弱い力でも挿入側筒部を十分変形させ
ることができ、かつ、前記直線あるいは曲率半径が比較
的大きい部分の肉厚が厚く形成されることにより、取り
付け板への十分な固着力を確保することができる。
【０００９】
【実施例】以下、本発明を図面を参照して詳細に説明す
る。図１は、本発明の一実施例を示す説明図で、図１
（ａ）は正面図、図１（ｂ）は図１（ａ）に示すＡ−Ａ
部の断面図である。この図は、先に説明した図２と同一
部分には同一符号が付してある。図１に示すように３
は、グロメットであり、車体パネルの一部である取り付
け板４（例えば、エンジンルームと車室を仕切る車体パ
ネル、または、ドアの開閉支持側の車体パネルなど）に
形成されている取り付け孔１に密着するように装着され
ている状態を示す。このグロメット３が図２に示す従来
のグロメット３と異なる点は、挿入側筒部２の肉厚が周
方向に部分的に異なるように形成された点である。
【００１０】例えば図１（ａ）に示すように、長円形筒
状を成す挿入側筒部２において、上下に配置される曲率
半径が比較的小さいＲ曲線部２ａが先端部２ｃの最も薄
い箇所で約１．５ｍｍ程度の肉厚で形成され、かつ、左
右に配置される直線部２ｂが先端部２ｃの最も厚い箇所
で約４．５ｍｍ程度の肉厚で形成される。かつ、Ｒ曲線
部２ａと直線部２ｂの接続部分は、肉厚が徐々に変化す
るなだらかな曲線により形成される。このようにＲ曲線
部２ａが薄肉で形成されるので、挿入側筒部２の外周側
から内周側方向に外力を受けると応力集中により、特に
Ｒ曲線部２ａは内周側に変形し易く、挿入側筒部２が萎
む。よって、取り付け孔１に挿入側筒部２を装着する
際、比較的弱い力で装着することが可能となり、作業性
が向上する。一方、直線部２ｂは、厚肉で形成されるの
で、グロメット３装着後、外力を受けても変形し難いた
め、ある程度の固着力を有し、簡単にはグロメット３は
外れないという利点を有する。
【００１１】グロメット３は、ゴムあるいは柔軟な樹脂
等で形成され、少なくとも挿入側筒部２と鍔部６と筒部
７が一体に形成されたものである。なお、挿入側筒部２
と鍔部６の隣接箇所には、取り付け孔１の縁が密着嵌合
する溝部８が周方向に形成されていると密着性が増すの
でグロメット３と取り付け孔１の接触部分の防水、防
塵、防音が向上するので好ましい。また挿入側筒部２の
外形は、基部２ｄから先端部２ｃに向かって外周長さが
徐々に小さく形成されている。つまり、先細りした筒形
状を成していると装着作業上好ましい。一方、筒部７
は、グロメット３を貫通するワイヤーハーネスをカバー
する機能を最低限有していればよいので、図１（ｂ）に
示すように肉厚は、薄く、かつ、均一であってよく、形
状は円筒形が好ましいが特に限定するものではない。
【００１２】
【発明の効果】本発明は、長円形を成した挿入側筒部を
有するグロメットにおいて、挿入側筒部の中心軸に対し
て外側に張り出した部分の肉厚が薄く、かつ、前記外側
に張り出した部分以外の部分の肉厚が厚く形成されるグ
ロメットを構成したから、取り付け穴に挿入する際、挿
入側筒部の中心軸に対して外側に張り出した部分を局部
的に萎め易くなり、作業効率を向上することができる。
なお、肉厚が厚く形成された部分によりグロメット装着
後の取り付け板への十分な固着力を確保することができ
る。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a grommet used for arranging a wire harness so as to pass through a mounting hole of a vehicle body or the like. [0002] A conventional grommet will be described below with reference to the drawings. 2A and 2B are explanatory views showing a conventional grommet 3, in which FIG. 2A is a front view, and FIG. 2B is a cross-sectional view taken along a line BB shown in FIG. 2A. As shown in FIG. 2A, in the conventional grommet 3, the thickness of the insertion-side cylindrical portion 2 is uniform in the circumferential direction. The thickness of each of the straight portions 2b linearly formed on the left and right similarly to the R-curved portion 2a described above is substantially the same in the circumferential direction of an arbitrary portion. However, FIG.
As shown in (b), the thickness of the insertion-side tube portion 2 is increased in the tube length direction, that is, in the direction from the distal end portion 2c to the base portion 2d. [0003] However, as shown in FIG. 2, the grommet 3 is attached to the mounting hole 4 of the mounting panel 4 for waterproofing, soundproofing and dustproofing. In addition, unexpected external force applied to the wire harness and the like penetrated and fixed to the grommet 3 (when assembling parts to the vehicle body, a worker pulls or pushes the wire harness, or due to vibration during driving of the car). The outer shape of the grommet 3 (particularly, a portion to be attached to the attachment hole 1) is formed larger than the attachment hole 1 so as not to come off. Therefore, when mounting the grommet 3 in the mounting hole 1, the edge of the mounting hole 1 is
Is inserted into the mounting hole 1 and then fitted into the groove beyond the base 2d, which is larger than the diameter of the mounting hole 1, and both are fixed. Since this work is performed manually, it becomes a heavy labor for the operator during mass production. If the thickness of the entire insertion-side tube portion 2 is reduced for the purpose of reducing the work, it is easily conceivable that the insertion-side tube portion 2 can be easily deformed and the grommet 3 can be mounted even with weak human power. However, if the thickness of the entire insertion-side tubular portion 2 is small, the fixing force between the mounting hole 1 and the grommet 3 becomes weak, and unexpected external force is applied, for example, when assembling electrical components or the like to the wire harness fixed to the grommet 3. And the insertion-side cylindrical portion 2 is deformed, and the grommet 3
Is removed from the mounting hole 1. Therefore, when considering reliability, the thickness of the entire insertion-side cylindrical portion 2 is
A thickness that cannot be easily deformed by hand is required. Thus, conventionally, there has been no grommet that satisfies both the assembling workability and the reliability after assembling. SUMMARY OF THE INVENTION [0004] The present invention has been made in view of the above points, and the work of mounting the mounting plate on a mounting plate is easy.
It is another object of the present invention to provide a grommet having a sufficient fixing force to a mounting plate. According to a first aspect of the present invention, there is provided a grommet having an oblong insertion-side cylindrical portion inserted into a mounting hole, wherein the grommet has an outer side with respect to a center axis of the insertion-side cylindrical portion. The thickness of the portion protruding to the outside is small, and the thickness of the portion other than the portion protruding to the outside is formed to be thick. [0006] As described above, in the insertion-side cylindrical portion, a thick portion and a thin portion coexist in the circumferential direction. When the insertion-side cylindrical portion is deformed, stress concentrates on the thin portion. It can be sufficiently deformed. The thick portion can ensure a sufficient fixing force to the mounting plate after the grommet is mounted. In order to deform the insertion-side cylindrical portion so as to shrink inward so that it can be easily inserted into the mounting hole, a portion that protrudes outward with respect to the center axis of the insertion-side cylindrical portion is locally formed. It is preferable to wither from the viewpoint of work efficiency. For example, in the insertion-side cylindrical portion having an oval shape, a portion protruding outward is an R-curve portion having a relatively small radius of curvature, and a portion other than the portion protruding outward is compared with a straight line or a radius of curvature. It is a big part. Since the thickness of the R-curved portion is reduced, the insertion-side cylindrical portion can be sufficiently deformed even with a weak force, and the thickness of the straight portion or the portion having a relatively large radius of curvature is increased. Thereby, a sufficient fixing force to the mounting plate can be secured. The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing one embodiment of the present invention.
1 (a) is a front view, and FIG. 1 (b) is an AA shown in FIG. 1 (a).
It is sectional drawing of a part. In this figure, the same parts as those in FIG. 2 described above are denoted by the same reference numerals. As shown in FIG.
Is a grommet, and is provided in a mounting hole 1 formed in a mounting plate 4 which is a part of a vehicle body panel (for example, a vehicle body panel that separates an engine room and a vehicle compartment, or a vehicle body panel on a door opening / closing support side). It shows a state in which it is attached so as to be in close contact. The grommet 3 differs from the conventional grommet 3 shown in FIG. 2 in that the grommet 3 is formed so that the thickness of the insertion-side tubular portion 2 is partially different in the circumferential direction. For example, as shown in FIG. 1 (a), in an insertion-side cylindrical portion 2 having an oblong cylindrical shape, an R-curved portion 2a having a relatively small radius of curvature, which is disposed vertically, has a thinnest portion at a tip portion 2c. The straight portions 2b arranged on the left and right are formed with a thickness of about 4.5 mm at the thickest portion of the tip 2c. Further, the connecting portion between the R-curved portion 2a and the straight portion 2b is formed by a gentle curve whose wall thickness gradually changes. As described above, since the R-curved portion 2a is formed to be thin, when an external force is applied from the outer peripheral side to the inner peripheral side of the insertion-side cylindrical portion 2, stress is concentrated, and particularly the R-curved portion 2a is easily deformed toward the inner peripheral side. Then, the insertion-side tubular portion 2 is withdrawn. Therefore, when mounting the insertion-side cylindrical portion 2 in the mounting hole 1, it is possible to mount the insertion-side cylindrical portion 2 with a relatively small force, and workability is improved. On the other hand, since the linear portion 2b is formed to be thick, it is difficult to be deformed even when subjected to an external force after the grommet 3 is attached, and thus has an advantage that it has a certain fixing force and the grommet 3 does not come off easily. . The grommet 3 is formed of rubber, a flexible resin or the like, and has at least the insertion-side tubular portion 2, the flange portion 6, and the tubular portion 7 integrally formed. In addition, the insertion-side cylindrical portion 2
When a groove 8 in which the edge of the mounting hole 1 is closely fitted is formed in the circumferential direction at a position adjacent to the flange 6, the adhesiveness is increased, so that the contact portion between the grommet 3 and the mounting hole 1 is waterproof, dustproof, and the like. It is preferable because soundproofing is improved. Further, the outer shape of the insertion-side cylindrical portion 2 is formed such that the outer peripheral length is gradually reduced from the base 2d toward the distal end 2c. In other words, it is preferable for the mounting operation to have a tapered cylindrical shape. On the other hand, the cylindrical portion 7
Need only have a function of covering the wire harness penetrating the grommet 3 at a minimum, and as shown in FIG. 1 (b), the thickness may be thin and uniform, and the shape may be cylindrical. The shape is preferable, but not particularly limited. According to the present invention, an insertion side cylindrical portion having an oval shape is provided.
In the grommet having, since the thickness of the portion protruding outward with respect to the center axis of the insertion side cylindrical portion is thin, and because the thickness of the portion other than the portion protruding outward is formed thick grommet, At the time of insertion into the mounting hole, the portion that protrudes outward with respect to the center axis of the insertion-side cylindrical portion can be easily locally shrunk, and the working efficiency can be improved.
In addition, a sufficient fixing force to the mounting plate after mounting the grommet can be ensured by the thicker portion.
【図面の簡単な説明】 【図１】本発明のグロメットを示す説明図である。 【図２】従来のグロメットを示す説明図である。 【符号の説明】 １ 取り付け孔 ２ 挿入側筒部 ２ａ Ｒ曲線部 ２ｂ 直線部 ３ グロメット[Brief description of the drawings] FIG. 1 is an explanatory view showing a grommet of the present invention. FIG. 2 is an explanatory view showing a conventional grommet. [Explanation of symbols] 1 mounting holes 2 Insertion side tube 2a R curve part 2b Straight section 3 Grommet
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−151557（ＪＰ，Ａ) 特開 平８−7686（ＪＰ，Ａ) 実開 平１−68627（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01B 17/58 B60R 16/02 622 F16L 5/02 H02G 3/22 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-151557 (JP, A) JP-A-8-7686 (JP, A) JP-A-1-68627 (JP, U) (58) Survey Field (Int.Cl. 7 , DB name) H01B 17/58 B60R 16/02 622 F16L 5/02 H02G 3/22
Claims (1)
入側筒部を有するグロメットにおいて、前記挿入側筒部
の中心軸に対して外側に張り出した部分の肉厚が薄く、
かつ、前記外側に張り出した部分以外の部分の肉厚が厚
く形成されることを特徴とするグロメット。(57) [Claim 1] In a grommet having an oblong insertion-side cylindrical portion inserted into a mounting hole, the grommet has an outer side with respect to a center axis of the insertion-side cylindrical portion. The thickness of the overhanging part is thin,
The grommet is characterized in that a part other than the part protruding outward has a large thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24760895A JP3412983B2 (en) | 1995-09-26 | 1995-09-26 | Grommet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24760895A JP3412983B2 (en) | 1995-09-26 | 1995-09-26 | Grommet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0992062A JPH0992062A (en) | 1997-04-04 |
| JP3412983B2 true JP3412983B2 (en) | 2003-06-03 |
Family
ID=17166044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24760895A Expired - Lifetime JP3412983B2 (en) | 1995-09-26 | 1995-09-26 | Grommet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3412983B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007184187A (en) * | 2006-01-10 | 2007-07-19 | Mitsubishi Cable Ind Ltd | Flexible grommet tube |
| JP5387541B2 (en) | 2010-10-29 | 2014-01-15 | 住友電装株式会社 | Grommet |
| JP6225809B2 (en) * | 2014-04-16 | 2017-11-08 | 住友電装株式会社 | Grommet |
| JP2016116361A (en) * | 2014-12-16 | 2016-06-23 | 住友電装株式会社 | Grommet and electric wire with grommet |
| JP6505467B2 (en) * | 2015-02-24 | 2019-04-24 | 株式会社フジクラ | Grommet |
-
1995
- 1995-09-26 JP JP24760895A patent/JP3412983B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0992062A (en) | 1997-04-04 |
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